General Description
The MAX4800A/MAX4802A provide high-voltage switch-
ing on eight channels for ultrasonic imaging and printer
applications. The devices utilize BCDMOS process
technology to provide eight high-voltage low-charge-
injection SPST switches, controlled by a 20MHz serial
interface. Data is clocked into an internal 8-bit shift reg-
ister and retained by a programmable latch with enable
and clear inputs. A power-on reset function ensures that
all switches are open on power-up.
The devices operate with a wide range of high-voltage
supplies including: VPP/VNN = +100V/-100V, +185V/-15V,
and +40V/-160V. The digital interface operates from a
separate VDD supply from +2.7V to +6V. Digital inputs
DIN, CLK, LE, and CLR are +6V tolerant, independent
of the VDD supply voltage. The MAX4802A provides
integrated 35kΩbleed resistors on each switch terminal
to discharge capacitive loads.
The devices are drop-in replacements for the Supertex
HV2203 and HV2303. They are available in the 48-pin
LQFP, 26-bump CSBGA, and 28-pin PLCC packages.
All devices are specified for the commercial 0°C to
+70°C temperature range.
Applications
Ultrasound Imaging
Printers
Features
♦Fast SPI™ Interface 20MHz
♦Pin-Compatible Replacement for Supertex HV2203
(MAX4800A)
♦Pin-Compatible Replacement for Supertex HV2303
(MAX4802A)
♦Flexible High-Voltage Supplies Up to VPP - VNN = 200V
♦Low-Charge-Injection, Low-Capacitance 22ΩΩ
Switches
♦DC to 50MHz Analog-Signal Frequency Range
♦-77dB Off-Isolation at 5MHz
♦Low 10µA Quiescent Current
♦Integrated Bleed Resistors (MAX4802A Only)
♦Available in Standard PLCC, LQFP, and CSBGA
Packages
MAX4800A/MAX4802A
Low-Charge-Injection, 8-Channel, High-Voltage
Analog Switches with 20MHz Serial Interface
________________________________________________________________
Maxim Integrated Products
1
19-4120; Rev 1; 2/11
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Ordering Information/
Selector Guide
PART BLEED
RESISTORS
SECOND
SOURCE
PIN-
PACKAGE
MAX4800ACXZ+* No — 26 CSBGA
MAX4800ACQI+ No HV2203PJ-G 28 PLCC
MAX4800ACCM+* No HV2203FG-G 48 LQFP
MAX4802ACXZ+* Yes — 26 CSBGA
MAX4802ACQI+ Yes HV2303PJ-G 28 PLCC
MAX4802ACCM+* Yes HV2303FG-G 48 LQFP
Note: All devices are specified over the commercial 0°C to +70°C
temperature range.
*
Future product—contact factory for availability.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
SPI is a trademark of Motorola, Inc.
CLR
LE
DIN
N.C.
VDD
GND
N.C. (RGND)
N.C.
VNN
N.C.
N.C.
CLK
COM4
N.C.
NO4
N.C.
N.C.
COM3
N.C.
COM2
NO3
N.C.
N.C.
COM5
N.C.
NO1
N.C.
N.C.
VPP
N.C.
NO0
COM1
N.C.
NO2
N.C.
+
NO5
N.C.
NO6
N.C.
COM6
N.C.
NO7
N.C.
COM7
DOUT
N.C.
N.C.
MAX4800A
MAX4802A
COM0
() MAX4802A ONLY
1234 5678910 11 12
36 35 34 33 32 31 30 29 28 27 26 25
37
38
39
40
41
42
43
44
45
46
47
48
24
23
22
21
20
19
18
17
16
15
14
13
LQFP
(7mm x 7mm)
TOP VIEW
Pin/Bump Configurations
Pin/Bump Configurations continued at end of data sheet.
MAX4800A/MAX4802A
Low-Charge-Injection, 8-Channel, High-Voltage
Analog Switches with 20MHz Serial Interface
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
(All voltages referenced to GND.)
VDD Logic Supply Voltage........................................-0.3V to +7V
VPP - VNN Supply Voltage ....................................................220V
VPP Positive Supply Voltage......................-0.3V to (VNN + 220V)
VNN Negative Supply Voltage ..............................+0.3V to -220V
Logic Inputs LE, CLR, CLK, DIN ..............................-0.3V to +7V
DOUT..........................................................-0.3V to (VDD + 0.3V)
RGND (MAX4802A)...............................................-4.5V to +0.3V
COM_, NO_.................................................................VNN to VPP
Continuous Power Dissipation (TA= +70°C)
26-Bump CSBGA (derate 11.8mW/°C above +70°C)..941mW
28-Pin PLCC (derate 10.5mW/°C above +70°C) .........842mW
48-Pin LQFP (derate 22.7mW/°C above +70°C)........1818mW
Operating Temperature Range...............................0°C to +70°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (excluding CSBGA, soldering, 10s) ..+300°C
Soldering Temperature (reflow)
28 PLCC.......................................................................+245°C
All other packages.......................................................+260°C
PACKAGE THERMAL CHARACTERISTICS (Note 1)
26 CSBGA
Junction-to-Ambient Thermal Resistance (θJA)...........85°C/W
Junction-to-Case Thermal Resistance (θJC)................23°C/W
28 PLCC
Junction-to-Ambient Thermal Resistance (θJA)...........44°C/W
Junction-to-Case Thermal Resistance (θJC)................10°C/W
48 LQFP
Junction-to-Ambient Thermal Resistance (θJA)...........44°C/W
Junction-to-Case Thermal Resistance (θJC)................10°C/W
ELECTRICAL CHARACTERISTICS
(VDD = +2.7V to +6V, VPP = +40V to (VNN + 200V), VNN = -40V to -160V, TA= TMIN to TMAX, unless otherwise noted. Typical values
are at TA= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ANALOG SWITCH
Analog-Signal Range VCOM_,
VNO_ (Note 3) VNN +
10
VPP -
10 V
TA = 0°C 30
TA= +25°C 26 38
ICOM = 5mA
TA = +70°C 48
TA = 0°C 25
TA = +25°C 22 27
VPP = +40V,
VNN = -160V,
VCOM_ = 0V ICOM =
200mA
TA = +70°C 32
TA = 0°C 25
TA = +25°C 22 27
ICOM = 5mA
TA = +70°C 30
TA = 0°C 18
TA = +25°C 18 24
Small-Signal Switch
On-Resistance RONS
VPP = +100V,
VNN = -100V,
VCOM_ = 0V ICOM =
200mA
TA = +70°C 27
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
MAX4800A/MAX4802A
Low-Charge-Injection, 8-Channel, High-Voltage
Analog Switches with 20MHz Serial Interface
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +6V, VPP = +40V to (VNN + 200V), VNN = -40V to -160V, TA= TMIN to TMAX, unless otherwise noted. Typical values
are at TA= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
TA = 0°C 23
TA = +25°C 20 25
ICOM = 5mA
TA = +70°C 30
TA = 0°C 22
TA = +25°C 16 25
Small-Signal Switch
On-Resistance RONS VPP = +160V,
VNN = -40V
ICOM =
200mA
TA = +70°C 27
Small-Signal Switch
On-Resistance Matching RONS VPP = +100V, VNN = -100V,
VCOM_ = 0V, ICOM = 5mA 5 20 %
Large-Signal Switch
On-Resistance RONL V
COM_ = VPP - 10V, ICOM = 1A 15
Shunt Resistance
(MAX4802A only) RINT NO_ or COM_ to RGND, switch off 30 35 50 k
0 2
Switch-Off Leakage ICOM_(OFF),
INO_(OFF)
VCOM_, VNO_ = VPP - 10V or unconnected;
(MAX4800A only) 10
μA
Switch-Off DC Offset RL = 100k (MAX4800A),
no load (MAX4802A) 0 10 mV
Switch-On DC Offset RL =100k (MAX4800A),
no load (MAX4802A) 0 10 mV
TA = 0°C 3
TA = +25°C 2 3
Switch-Output Peak Current
(Note 4) I
COM_ duty cycle 0.1%
TA = +70°C 2
A
Switch-Output Isolation Diode
Current 300ns pulse width, 2% duty cycle (Note 4) 300 mA
SWITCH DYNAMIC CHARACTERISITICS
f = 5MHz, RL= 1k, CL = 15pF -30 -33
Off-Isolation (Note 4) VISO f = 5MHz, RL = 50-58 -77 dB
Crosstalk VCT f = 5MHz, RL= 50 (Note 4) -60 -80 dB
COM_, NO_
Off-Capacitance
CCOM_(OFF),
CNO_ (OFF) VCOM_ = 0V, VNO_ = 0V, f = 1MHz (Note 4) 4 11 18 pF
COM_ On-Capacitance CCOM_
(ON) VCOM_ = 0V, f = 1MHz (Note 4) 20 36 56 pF
Output Voltage Spike VSPK R
L= 50 (Note 4) -150 +150 mV
VPP = +40V, VNN = -160V, VCOM_ = 0V 820
VPP = +100V, VNN = -100V, VCOM_ = 0V 600
Charge Injection
(MAX4802A only) Q
VPP = +160V, VNN = -40V, VCOM_ = 0V 350
pC
LOGIC LEV EL S
Logic-Input Low Voltage VIL 0.75 V
Logic-Input High Voltage VIH VDD -
0.75 V
MAX4800A/MAX4802A
Low-Charge-Injection, 8-Channel, High-Voltage
Analog Switches with 20MHz Serial Interface
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +6V, VPP = +40V to (VNN + 200V), VNN = -40V to -160V, TA= TMIN to TMAX, unless otherwise noted. Typical values
are at TA= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Logic Input Capacitance CIN (Note 4) 10 pF
Logic Input Leakage IIN -1 +1 μA
DOUT Low Voltage VOL I
SINK = 1mA 0.4 V
DOUT High Voltage VOH I
SOURCE = 0.75mA VDD -
0.5 V
POWER SUPPLIES
VDD Supply Voltage VDD 2.7 6.0 V
VPP Supply Voltage VPP 40
VNN +
200 V
VNN Supply Voltage VNN -160 -15 V
VDD Supply Quiescent Current IDDQ V
IL = 0V, VIH = VPSD, fCLK = 0Hz 3 μA
VDD Supply Dynamic Current IDD VDD = +5V, VIL = 0V, VIH = +5V,
fCLK = 5MHz 2 mA
VPP Supply Quiescent Current IPPQ All switches remain on or off,
ICOM_(ON) = 5mA 10 50 μA
TA = 0°C 6.5
TA = +25°C 6.5
VPP = +40V,
VNN = -160V
TA = +70°C 6.5
TA = 0°C 4.0
TA = +25°C 4.0
VPP = +100V,
VNN = -100V
TA = +70°C 4.0
TA = 0°C 4.0
TA = +25°C 4.0
VPP Supply Dynamic Current IPP
50kHz
output
switching
frequency
with no load
VPP = +160V,
VNN = -40V
TA = +70°C 4.0
mA
VNN Supply Quiescent Current INNQ All switches remain on or off,
ICOM_(ON) = 5mA 10 50 μA
TA = 0°C 6.5
TA = +25°C 6.5
VPP = +40V,
VNN = -160V
TA = +70°C 6.5
TA = 0°C 4.0
TA = +25°C 4.0
VPP = +100V,
VNN = -100V
TA = +70°C 4.0
TA = 0°C 4.0
TA = +25°C 4.0
VNN Supply Dynamic Current INN
50kHz
output
switching
frequency
with no load
VPP = +160V,
VNN = -40V
TA = +70°C 4.0
mA
MAX4800A/MAX4802A
Low-Charge-Injection, 8-Channel, High-Voltage
Analog Switches with 20MHz Serial Interface
_______________________________________________________________________________________ 5
TIMING CHARACTERISTICS
(VDD = +2.7V to +6V, VPP = +40V to (VNN + 200V), VNN = -40V to -160V, TA= TMIN to TMAX, unless otherwise noted. Typical values
are at TA= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ANALOG SWITCH
Turn-On Time tON VNO_ = VPP - 10V, RL = 10kΩ, VNN = -40V
to -160V 5µs
Turn-Off Time tOFF VNO_ = VPP - 10V, RL = 10kΩ, VNN = -40V
to -160V 5µs
Output Switching Frequency fSW Duty cycle = 50% 50 kHz
Maximum VCOM_, VNO_ Slew
Rate dV/dt (Note 4) 20 V/ns
LOGIC TIMING (Figure 1)
VDD = +5V ±10% 20
CLK Frequency fCLK D ai sy chai ni ng VDD = +3V ±10% 10 MHz
VDD = +5V ±10% 10
DIN to CLK Setup Time tDS VDD = +3V ±10% 16 ns
VDD = +5V ±10% 3
DIN to CLK Hold Time tDH VDD = +3V ±10% 3 ns
VDD = +5V ±10% 36
CLK to LE Setup Time tCS VDD = +3V ±10% 65 ns
VDD = +5V ±10% 14
LE Low Pulse Width tWL VDD = +3V ±10% 22 ns
VDD = +5V ±10% 20
CLR High Pulse Width tWC VDD = +3V ±10% 40 ns
VDD = +5V ±10% 50
CLK Rise and Fall Times (Note 4) tR, tFVDD = +3V ±10% 50 ns
VDD = +5V ±10%, CL ≤ 20pF 6 42
CLK to DOUT Delay tDO VDD = +3V ±10%, CL ≤ 20pF 12 80 ns
Note 2: Specifications at 0°C are guaranteed by correlation and design.
Note 3: The analog-signal input VCOM_ and VNO_ must satisfy VNN ≤(VCOM_, VNO_) ≤VPP, or remain unconnected during power-up
and power-down.
Note 4: Guaranteed by design and characterization; not production tested.
MAX4800A/MAX4802A
Low-Charge-Injection, 8-Channel, High-Voltage
Analog Switches with 20MHz Serial Interface
6 _______________________________________________________________________________________
Typical Operating Characteristics
(VDD = +5V, VPP = +100V, VNN = -100V, TA= +25°C, unless otherwise noted.)
0
0.01 1010.1
IDD SUPPLY CURRENT
vs. CLOCK FREQUENCY
1.0
0.9
0.3
0.1
0.7
0.6
0.4
0.2
0.8
0.5
MAX4800A/2A toc01
CLOCK FREQUENCY (MHz)
IDD SUPPLY CURRENT (mA)
DIN = 01010101
DIN = 00000000
OFF-ISOLATION vs. FREQUENCY
MAX4800A/2A toc02
FREQUENCY (MHz)
OFF-ISOLATION (dB)
-65
-70
-75
-80
-85
-90
-95
-100
-60
110
RS = RL = 50Ω
0
10
5
20
15
25
30
0304010 20 50 60 70
ON-RESISTANCE
vs. TEMPERATURE
MAX4800A/2A toc03
TEMPERATURE (°C)
ON-RESISTANCE (Ω)
ISW = 5mA
ISW = 200mA
0
5
10
15
20
25
30
35
40
+40/
-160
+60/
-140
+80/
-120
+100/
-100
+120/
-80
+140/
-60
+160/
-40
ON-RESISTANCE
vs. VPP/VNN SUPPLY VOLTAGE
MAX4800A/2A toc04
VPP/VNN SUPPLY VOLTAGE (V)
ON-RESISTANCE (Ω)
TA = +70°C
TA = 0°CTA = +25°C
0
40
20
100
80
60
160
140
120
180
0203010 40 50 60 70
CLK TO DOUT DELAY
vs. TEMPERATURE
MAX4800A/2A toc05
TEMPERATURE (°C)
tDO (ns)
VDD = +3V
VDD = +5V
0
1.0
2.0
4.0
5.0
6.0
0405020 3010 60 70 80 90 100
SUPPLY CURRENT
vs. SWITCHING FREQUENCY
MAX4800A/2A toc06
SWITCHING FREQUENCY (kHz)
SUPPLY CURRENT (mA)
INN
IPP
IDD
ALL SWITCHES OPERATING
ALL SWITCHES CONNECTED TO GND
3.0
0.20
0.25
0.35
0.30
0.40
0.45
SUPPLY CURRENT
vs. VPP/VNN SUPPLY VOLTAGE
MAX4800A/2A toc07
SUPPLY CURRENT (mA)
ONE SWITCH OPERATING
ALL SWITCHES CONNECTED TO GND
fSW = 50kHz
INN
IPP
+40/
-160
+60/
-140
+80/
-120
+100/
-100
+120/
-80
+140/
-60
+160/
-40
VPP/VNN SUPPLY VOLTAGE (V)
0
1.0
0.5
2.0
1.5
3.0
2.5
3.5
LOGIC THRESHOLD
vs. VDD SUPPLY VOLTAGE
MAX4800A/2A toc08
VDD SUPPLY VOLTAGE (V)
LOGIC THRESHOLD (V)
23456
RISING
FALLING
MAX4800A/MAX4802A
Low-Charge-Injection, 8-Channel, High-Voltage
Analog Switches with 20MHz Serial Interface
_______________________________________________________________________________________ 7
Pin/Bump Descriptions
PIN/BUMP
MAX4800A
LQFP
MAX4800A
CSBGA
MAX4800A
PLCC
NAME FUNCTION
1 E4 26 COM5 Analog Switch 5—Common Terminal
2, 4, 6, 7, 9,
11, 13, 15, 17,
19, 21, 23, 26,
27, 30, 31, 32,
38, 40, 42, 44,
46, 48
D6 9, 11, 15 N.C. No Connection. Not connected internally.
3 E1 27 COM4 Analog Switch 4—Common Terminal
5 E3 28 NO4 Analog Switch 4—Normally Open Terminal
8 D1 1 COM3 Analog Switch 3—Common Terminal
10 D3 2 NO3 Analog Switch 3—Normally Open Terminal
12 D4 3 COM2 Analog Switch 2—Common Terminal
14 C3 4 NO2 Analog Switch 2—Normally Open Terminal
16 C4 5 COM1 Analog Switch 1—Common Terminal
18 A4 6 NO1 Analog Switch 1—Normally Open Terminal
20 C5 7 COM0 Analog Switch 0—Common Terminal
22 D5 8 NO0 Analog Switch 0—Normally Open Terminal
24 C6 10 VPP Positive High-Voltage Supply. Bypass VPP to GND with a
0.1μF or greater ceramic capacitor.
25 C7 12 VNN Negative High-Voltage Supply. Bypass VNN to GND with a
0.1μF or greater ceramic capacitor.
28 D7 13 GND Ground
29 D9 14 VDD Digital Supply Voltage. Bypass VDD to GND with a 0.1μF or
greater ceramic capacitor.
33 E9 16 DIN Serial-Data Input
34 E7 17 CLK Serial-Clock Input
35 E6 18 LE Latch-Enable Input, Active Low
36 F7 19 CLR Latch Clear Input
37 F6 20 DOUT Serial-Data Output
39 E5 21 COM7 Analog Switch 7—Common Terminal
41 F5 22 NO7 Analog Switch 7—Normally Open Terminal
43 F4 23 COM6 Analog Switch 6—Common Terminal
45 H4 24 NO6 Analog Switch 6—Normally Open Terminal
47 F3 25 NO5 Analog Switch 5—Normally Open Terminal
MAX4800A/MAX4802A
Low-Charge-Injection, 8-Channel, High-Voltage
Analog Switches with 20MHz Serial Interface
8 _______________________________________________________________________________________
Pin/Bump Descriptions (continued)
PIN/BUMP
MAX4802A
LQFP
MAX4802A
CSBGA
MAX4802A
PLCC
NAME FUNCTION
1 E4 26 COM5 Analog Switch 5—Common Terminal
2, 4, 6, 7, 9,
11,13, 15, 17,
19, 21, 23, 26,
30, 31, 32, 38,
40, 42, 44, 46,
48
— 9, 15 N.C. No Connection. Not connected internally.
3 E1 27 COM4 Analog Switch 4—Common Terminal
5 E3 28 NO4 Analog Switch 4—Normally Open Terminal
8 D1 1 COM3 Analog Switch 3—Common Terminal
10 D3 2 NO3 Analog Switch 3—Normally Open Terminal
12 D4 3 COM2 Analog Switch 2—Common Terminal
14 C3 4 NO2 Analog Switch 2—Normally Open Terminal
16 C4 5 COM1 Analog Switch 1—Common Terminal
18 A4 6 NO1 Analog Switch 1—Normally Open Terminal
20 C5 7 COM0 Analog Switch 0—Common Terminal
22 D5 8 NO0 Analog Switch 0—Normally Open Terminal
24 C6 10 VPP Positive High-Voltage Supply. Bypass VPP to GND with a
0.1μF or greater ceramic capacitor.
25 C7 12 VNN Negative High-Voltage Supply. Bypass VNN to GND with a
0.1μF or greater ceramic capacitor.
27 D6 11 RGND Bleed Resistor Ground
28 D7 13 GND Ground
29 D9 14 VDD Digital Supply Voltage. Bypass VDD to GND with a 0.1μF or
greater ceramic capacitor.
33 E9 16 DIN Serial-Data Input
34 E7 17 CLK Serial-Clock Input
35 E6 18 LE Latch-Enable Input, Active Low
36 F7 19 CLR Latch Clear Input
37 F6 20 DOUT Serial-Data Output
39 E5 21 COM7 Analog Switch 7—Common Terminal
41 F5 22 NO7 Analog Switch 7—Normally Open Terminal
43 F4 23 COM6 Analog Switch 6—Common Terminal
45 H4 24 NO6 Analog Switch 6—Normally Open Terminal
47 F3 25 NO5 Analog Switch 5—Normally Open Terminal
MAX4800A/MAX4802A
Low-Charge-Injection, 8-Channel, High-Voltage
Analog Switches with 20MHz Serial Interface
_______________________________________________________________________________________ 9
Detailed Description
The MAX4800A/MAX4802A provide high-voltage
switching on eight channels for ultrasound imaging and
printer applications. The devices utilize BCDMOS
process technology to provide eight high-voltage low-
charge-injection SPST switches, controlled by a 20MHz
serial interface. Data is clocked into an internal 8-bit
shift register and retained by a programmable latch
with enable and clear inputs. A power-on reset function
ensures that all switches are open on power-up.
The devices operate with a wide range of high-voltage
supplies including: VPP/VNN = +100V/-100V,
+185V/-15V, or +40V/-160V. The digital interface oper-
ates from a separate VDD supply from +2.7V to +6V.
Digital inputs DIN, CLK, LE, and CLR are +6V tolerant,
independent of the VDD supply voltage. The MAX4802A
provides integrated 35kΩbleed resistors on each
switch terminal to discharge capacitive loads.
The devices are drop-in replacements for the Supertex
HV2203 and HV2303, respectively.
Analog Switch
The devices allow a peak-to-peak analog-signal range
from VNN + 10V to VPP - 10V. Analog switch inputs
must be unconnected, or satisfy VNN ≤(VCOM_,
VNO_)≤VPP during power-up and power-down.
High-Voltage Supplies
The devices allow a wide range of high-voltage sup-
plies. The devices operate with VNN from
-160V to -15V and VPP from +40V to (VNN + 200V).
When VNN is connected to GND (single-supply applica-
tions), the devices operate with VPP up to +200V.
50%
50%
tWC
90%
tON
DIN
LE
CLK
DOUT
SWITCH
*FOR SLOWER CLK RATES REFER TO THE MAX4800/MAX4801/MAX4802 DATA SHEET.
CLR
OFF
ON
10%
tOFF
tDO
tDH
tDS
50%
50% 50%
50%
50%
50% DNDN-1
DN+1
tWL
tCS
Figure 1. Serial Interface Timing*
MAX4800A/MAX4802A
Low-Charge-Injection, 8-Channel, High-Voltage
Analog Switches with 20MHz Serial Interface
10 ______________________________________________________________________________________
The VPP and VNN high-voltage supplies are not
required to be symmetrical, but the voltage difference
VPP - VNN must not exceed 200V.
Bleed Resistors (MAX4802A)
The MAX4802A features integrated 35kΩbleed resis-
tors to discharge capacitive loads such as piezoelec-
tric transducers. Each analog-switch terminal is
connected to RGND with a bleed resistor.
Serial Interface
The devices are controlled by a serial interface with an
8-bit serial shift register and transparent latch. Each of
the eight data bits controls a single analog switch (see
Table 1). Data on DIN is clocked with the most signifi-
cant bit (MSB) first into the shift register on the rising
edge of CLK. Data is clocked out of the shift register
onto DOUT on the rising edge of CLK. DOUT reflects
the status of DIN, delayed by eight clock cycles (see
Figures 1 and 2).
Latch Enable (
LE
)
Drive LE logic-low to change the contents of the latch
and update the state of the high-voltage switches
(Figure 2). Drive LE logic-high to freeze the contents of
the latch and prevent changes to the switch states. To
reduce noise due to clock feedthrough, drive LE logic-
high while data is clocked into the shift register. After
the data shift register is loaded with valid data, pulse
LE logic-low to load the contents of the shift register
into the latch.
Latch Clear (CLR)
The devices feature a latch clear input. Drive CLR
logic-high to reset the contents of the latch to zero and
open all switches. CLR does not affect the contents of
the data shift register. Pulse LE logic-low to reload the
contents of the shift register into the latch.
Power-On Reset
The devices feature a power-on reset circuit to ensure
all switches are open at power-on. The internal 8-bit ser-
ial shift register and latch are set to zero on power-up.
LE
CLK
DOUT
DATA FROM PREVIOUS DATA BYTE POWER-UP DEFAULT: D7–D0 = 0
D7 D6 D5 D4 D3 D2 D1 D0 D7
DIN D7 D6 D5 D4 D3 D2 D1 D0
MSB LSB
Figure 2. Latch-Enable Interface Timing
MAX4800A/MAX4802A
Low-Charge-Injection, 8-Channel, High-Voltage
Analog Switches with 20MHz Serial Interface
______________________________________________________________________________________ 11
Applications Information
Logic Levels
The devices’ digital interface inputs CLK, DIN, LE, and
CLR are tolerant of up to +6V, independent of the VDD
supply voltage, allowing compatibility with higher volt-
age controllers.
Daisy Chaining Multiple Devices
Digital output DOUT is provided to allow the connection
of multiple devices by daisy-chaining (Figure 3).
Connect each DOUT to the DIN of the subsequent
device in the chain. Connect CLK, LE, and CLR inputs
of all devices, and drive LE logic-low to update all
devices simultaneously. Drive CLR high to open all the
switches simultaneously. Additional shift registers may
be included anywhere in series with the MAX4800A/
MAX4802A data chain.
Supply Sequencing and Bypassing
The devices do not require special sequencing of the
VDD, VPP, and VNN supply voltages; however, analog
switch inputs must be unconnected, or satisfy VNN ≤
(VCOM_, VNO_) ≤VPP during power-up and power-
down. Bypass VDD, VNN, and VPP to GND with a 0.1µF
ceramic capacitor as close to the device as possible.
Chip Information
PROCESS: BCDMOS
Table 1. Serial Interface Programming
X = Don’t care.
DATA BITS CONTROL BITS FUNCTION
D0
(LSB)
D1 D2 D3 D4 D5 D6
D7
(MSB)
LE CLR
SW0 SW1 SW2 SW3 SW4 SW5 SW6
SW7
LLLOff
HLLOn
LLLOff
HLLOn
LLLOff
HLLOn
LLLOff
HLLOn
LLL Off
HLL On
LLL Off
HLL On
LLL Off
HLL On
LL L Off
HL L On
X X X X X X X X H L Hold Previous State
X X X X X X X X X H Off Off Off Off Off Off Off Off
MAX4800A/MAX4802A
Low-Charge-Injection, 8-Channel, High-Voltage
Analog Switches with 20MHz Serial Interface
12 ______________________________________________________________________________________
MAX4800A
LELE
CLKCLK
CLR
MAX4800A MAX4800A
LE
CLK
DIN
LE
CLK
DIN DIN DIN
CLR CLR CLR
DOUT DOUT DOUT
U1nU11U10
Figure 3. Interfacing Multiple Devices by Daisy-Chaining
SHIFT
REGISTER
LEVEL
SHIFTER
LEVEL
SHIFTER
DIN
CLK
DOUT
CLR
VNN
VPP
GND
COM0
NO0
COM7
NO7
LE
LATCH
VDD
MAX4800A
Functional Diagrams
MAX4800A/MAX4802A
Low-Charge-Injection, 8-Channel, High-Voltage
Analog Switches with 20MHz Serial Interface
______________________________________________________________________________________ 13
SHIFT
REGISTER
LEVEL
SHIFTER
LEVEL
SHIFTER
DIN
CLK
DOUT
CLR
VNN
VPP
GND
COM0
NO0
COM7
NO7
LATCH
VDD
MAX4802A
RGND
LE
Functional Diagrams (continued)
12 13 14 15 16 17 18
1234262728
19
20
21
22
23
24
25
5
6
7
8
9
10
11
NO5
NO6
COM6
NO7
COM7
DOUT
CLR
VNN
GND
VDD
N.C.
DIN
CLK
LE
COM1
NO1
COM0
NO0
N.C.
VPP
N.C. (RGND)
NO2
COM2
NO3
COM3
NO4
COM4
COM5
MAX4800A
MAX4802A
() MAX4802A ONLY
PLCC
TOP VIEW
+
Pin/Bump Configurations (continued)
MAX4800A/MAX4802A
Low-Charge-Injection, 8-Channel, High-Voltage
Analog Switches with 20MHz Serial Interface
14 ______________________________________________________________________________________
A
B
C
D
E
F
G
H
123456789
D1
E1 E7
F7
C7
D7
A4
H4
E9
D9
E6
F6
C6
D6
E5
F5
C5
D5
E4
F4
C4
D4
E3
F3
C3
D3
COM0COM1
COM2COM3
COM4 COM5
COM6
COM7
NO0
NO1
NO2
NO3
NO4
NO5
NO6
NO7
DIN
CLK
LE
CLR
DOUT
GND
N.C. (RGND) VDD
VPP VNN
CSBGA
MAX4800A
MAX4802A
() MAX4802A ONLY
TOP VIEW
+
Pin/Bump Configurations (continued)
Package Information
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains
to the package regardless of RoHS status.
PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
26 CSBGA X07265+1 21-0158 90-0184
28 PLCC Q28+13 21-0049 90-0235
48 LQFP C48+6 21-0054 90-0093
MAX4800A/MAX4802A
Low-Charge-Injection, 8-Channel, High-Voltage
Analog Switches with 20MHz Serial Interface
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________
15
© 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 5/08 Initial release —
1 2/11
Changed the DC analog-signal frequency range to 50MHz in the Features section;
changed the TQFP package to LQFP in the General Description,Ordering Information,
Features,Pin/Bump Configurations,Pin/Bump Descriptions, and Package Information
1, 8, 14
