CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures.
Copyright © Harris Corporation 1993 9-134
SEMICONDUCTOR
IH5140 thru IH5145
High-Level
CMOS Analog Switch
Description
The IH5140 Family of CMOS switches utilizes Harris’ latch-
free junction isolated processing to build the fastest switches
currently available. These switches can be toggled at a rate of
greater than 1MHz with fast t ON times (80ns typical) and faster
tOFF times (50ns typical), guaranteeing break before make
switching. This family of switches combines the speed of the
hybrid FET DG180 family with the reliability and low power
consumption of a monolithic CMOS construction.
Very low quiescent power is dissipated in either the ON or
the OFF state of the switch. Maximum power supply current
is 10µA (at +25oC) from any supply and typical quiescent
currents are in the 10nA which makes these devices ideal for
portable equipment and military applications.
The IH5140 Family is completely compatible with TTL (5V)
logic, TTL open collector logic and CMOS logic. It is pin
compatible with Harris’ IH5040 family and part of the DG180/
DG190 family as shown in the switching state diagrams.
Features
• Super Fast Break-Before-Make Switching
•t
ON 80ns Typ, tOFF 50ns Typ (SPST Switches)
• Power Supply Currents Less Than 1µA
• OFF Leakages Less Than 100pA at +25oC Typical
• Non-Latching with Supply Turn-Off
• Single Monolithic CMOS Chip
• Plug-In Replacements for IH5040 Family and Part of
the DG180 Family to Upgrade Speed and Leakage
• Greater Than 1MHz Toggle Rate
• Switches Greater Than 20Vp-p Signals with±15V Supplies
• TTL, CMOS Direct Compatibility
• Internal Diode in Series with V+ for Fault Protection
File Number 3132
December 1993
Pinouts
IH5140
(PDIP, CDIP)
TOP VIEW
IH5141
(PDIP, CDIP)
TOP VIEW
IH5142
(PDIP, CDIP)
TOP VIEW
IH5143
(PDIP, CDIP)
TOP VIEW
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
D
NC
NC
NC
NC
NC
NC
NC
S
V-
GND
VL
V+
NC
NC
IN
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
D1
NC
NC
NC
NC
NC
D2
NC
S1
V-
GND
VL
V+
IN2
S2
IN1
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
S1
V-
GND
VL
V+
NC
NC
IN
D1
NC
D2
S2
NC
NC
NC
NC
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
D1
NC
D3
S3
S4
D4
D2
NC
S1
V-
GND
VL
V+
IN2
S2
IN1
9-135
IH5140 Series
IH5144
(PDIP, CDIP)
TOP VIEW
IH5145
(PDIP, CDIP)
TOP VIEW
Ordering Information
PART NUMBER FUNCTION TEMPERATURE RANGE PACKAGE
IH5140MJE SPST -55oC to +125oC 16 Lead Ceramic DIP
IH5140CJE SPST 0oC to +70oC 16 Lead Ceramic DIP
IH5140CPE SPST 0oC to +70oC 16 Lead Plastic DIP
IH5141MJE Dual SPST -55oC to +125oC 16 Lead Ceramic DIP
IH5141CJE Dual SPST 0oC to +70oC 16 Lead Ceramic DIP
IH5141CPE Dual SPST 0oC to +70oC 16 Lead Plastic DIP
IH5142MJE SPDT -55oC to +125oC 16 Lead Ceramic DIP
IH5142CJE SPDT 0oC to +70oC 16 Lead Ceramic DIP
IH5142CPE SPDT 0oC to +70oC 16 Lead Plastic DIP
IH5143MJE Dual SPDT -55oC to +125oC 16 Lead Ceramic DIP
IH5143CJE Dual SPDT 0oC to +70oC 16 Lead Ceramic DIP
IH5143CPE Dual SPDT 0oC to +70oC 16 Lead Plastic DIP
IH5144MJE DPST -55oC to +125oC 16 Lead Ceramic DIP
IH5144CJE DPST 0oC to +70oC 16 Lead Ceramic DIP
IH5144CPE DPST 0oC to +70oC 16 Lead Plastic DIP
IH5145MJE Dual DPST -55oC to +125oC 16 Lead Ceramic DIP
IH5145CJE Dual DPST 0oC to +70oC 16 Lead Ceramic DIP
IH5145CPE Dual DPST 0oC to +70oC 16 Lead Plastic DIP
IH5140MJE/883B SPST -55oC to +125oC 16 Lead Ceramic DIP
IH5141MJE/883B Dual SPST -55oC to +125oC 16 Lead Ceramic DIP
IH5142MJE/883B SPDT -55oC to +125oC 16 Lead Ceramic DIP
IH5143MJE/883B Dual SPDT -55oC to +125oC 16 Lead Ceramic DIP
IH5144MJE/883B DPST -55oC to +125oC 16 Lead Ceramic DIP
IH5145MJE/883B Dual DPST -55oC to +125oC 16 Lead Ceramic DIP
NOTES:
1. For MIL-STD-883 compliant parts, request the /883 datasheet on the above products.
Pinouts (Continued)
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
D1
NC
D2
S2
NC
NC
NC
NC
S1
V-
GND
VL
V+
NC
NC
IN
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
D1
NC
D3
S3
S4
D4
D2
NC
S1
V-
GND
VL
V+
IN2
S2
IN1
9-136
IH5140 Series
Functional Block Diagram
TYPICAL DRIVER/GATE - IH5142
V+
10kΩ
T2L
INPUT
100Ω
VL
5kΩ
Q3 Q7 Q5
Q2
Q12
Q1 Q8
Q9
Q10
V+
V-
5kΩ3kΩ
Q4 Q6 Q11
Q13 Q15
Q14
V-
Q17
Q16Q18
S1
D1
S2
D2
9-137
IH5140 Series
Switching State Diagrams
DIP (JE, PE) DIP (JE, PE)
SPST IH5140 DUAL SPST IH5141
DIP(JE, PE) DIP (JE, PE)
SPDT IH5142 DUAL SPDT IH5143
DIP (JE, PE) DIP (JE, PE)
DPST IH5144 DUAL DPST IH5145
VLV+
D
V-GND
IN
S16
15
13 14
12 11
1
VLV+
D1
V-GND
IN1
S116
15
13 14
12 11 1
D2
IN2
S29
10
8
VLV+
D1
V-GND
S2
S116
4
13 14
12 11
1
D2
3
IN 15
VLV+
D1
V-GND
IN1
S116
15
13 14
12 11
1
D3
S343
D
4
S
4
56
D
2
IN2
S29
10
8
VLV+
D1
V-GND
S2
S116
4
13 14
12 11
1
IN 15
D2
3
VLV+
D1
V-GND
IN1
S116
15
13 14
12 11
1
D2
IN2
S29
10
8
D3
S343
D
4
S
4
56
9-138
Specifications IH5140 Series
Absolute Maximum Ratings Thermal Information
V+ to V-. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <36V
V+ to VD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <30V
VD to V-. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <30V
VD to VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <±22V
VL to V-. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <33V
VL to VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <30V
VL to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <20V
VIN to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <20V
Current (Any Terminal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30mA
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . -65oC to +150oC
Lead Temperature (Soldering 10s). . . . . . . . . . . . . . . . . . . . +300oC
Thermal Resistance θJA θJC
Ceramic DIP Package. . . . . . . . . . . . . . . 80oC/W 24oC/W
Plastic DIP Package . . . . . . . . . . . . . . . . 100oC/W -
Operating Temperature
M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-55oC to +125oC
C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to +70oC
Junction Temperature
Ceramic DIP Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . +175oC
Plastic DIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150oC
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Electrical Specifications +25oC, V+ = +15V, V- = -15V, VL = +5V
PER CHANNEL PARAMETERS TEST CONDITIONS
MILITARY COMMERCIAL
UNITS-55oC +25oC +125oC0
o
C +25oC +70oC
LOGIC INPUT
Input Logic Current, IINH VIN = 2.4V, Note 1 ±1±110−±10 10 µA
Input Logic Current, IINL VIN = 0.8V, Note 1 ±1±110−±10 10 µA
SWITCH
Drain Source On Resistance,
RDS(ON)
IS = -10mA, VANALOG = -10V to
+10V 50 50 75 75 75 100 Ω
Channel to Channel RDS(ON) Match,
∆RDS(ON)
- 25 (Typ) - - 30 (Typ) - Ω
Minimum Analog Signal Handling
Capability, VANALOG
-±11
(Typ) --±10
(Typ) -V
Switch OFF Leakage Current,
ID(OFF)+IS(OFF)
VD = +10V, VS = -10V - ±0.5 100 - ±5 100 nA
VD = -10V, VS = +10V - ±0.5 100 - ±5 100 nA
Switch On Leakage Current,
ID(ON)+IS(ON)
VD = VS = -10V to +10V - ±1 200 - ±2 200 nA
Minimum Channel to Channel Cross
Coupling Rejection Ratio, CCRR One Channel Off; Any Other
Channel Switches, See
Performance Characteristics
- 54 (Typ) - - 50 (Typ) - dB
Switch “ON” Time, tON See switching time specifications and timing diagrams
Switch “OFF” Time, tOFF See switching time specifications and timing diagrams
Charge Injection, Q(INJ) See Performance Characteristics - 10 (Typ) - - 15 (Typ) - pC
Minimum Off Isolation Rejection
Ratio, OIRR f = 1MHz, RL = 100Ω,
CL≤ 5pF, See Performance
Characteristics
- 54 (Typ) - - 50 (Typ) - dB
SUPPLY
+ Power Supply Quiescent Current, I+ V+ = +15V, V- = -15V,
VL = +5V, See Performance
Characteristics
1.0 1.0 10 10 10 100 µA
- Power Supply Quiescent Current, I- 1.0 1.0 10 10 10 100 µA
+5V Supply Quiescent Current, IL1.0 1.0 10 10 10 100 µA
Ground Supply Quiescent Current,
IGND
1.0 1.0 10 10 10 100 µA
NOTE:
1. Some channels are turned on by high (1) logic inputs and other channels are turned on by low (0) inputs; however 0.8V to 2.4V describes
the minimum range for switching properly . Refer to logic diagrams to find logical value of logic input required to produce ON or OFF state.
2. Typical values are for design aid only, not guaranteed and not subject to production testing.
9-139
Specifications IH5140 Series
Switching Time Specifications (tON, tOFF are Maximum Specifications and tON - tOFF is Minimum Specification)
PART NUMBER SPECIFICATIONS TEST
CONDITIONS
MILITARY COMMERCIAL
UNITS-55oC +25oC +125oC0
o
C +25oC +70oC
IH5140, IH5141 Switch “ON” Time, tON Figure 8, Note 2 - 100 - - 150 - ns
Switch “OFF” Time, tOFF - 75 - - 125 - ns
Break-Before-Make, tON - tOFF -10 --5-ns
Switch “ON” Time, tON Figure 7 - 150 - - 175 - ns
Switch “OFF” Time, tOFF - 125 - - 150 - ns
IH5142, IH5143 Switch “ON” Time, tON Figure 8, Note 2 - 175 - - 250 - ns
Switch “OFF” Time, tOFF - 125 - - 150 - ns
Break-Before-Make, tON - tOFF -10 --5-ns
Switch “ON” Time, tON Figure 7 - 200 - - 300 - ns
Switch “OFF” Time, tOFF - 125 - - 150 - ns
Switch “ON” Time, tON Figure 2, Note 2 - 175 - - 250 - ns
Switch “OFF” Time, tOFF - 125 - - 150 - ns
Break-Before-Make, tON - tOFF -10 --5-ns
Switch “ON” Time, tON Figure 3, Note 2 - 200 - - 300 - ns
Switch “OFF” Time, tOFF - 125 - - 150 - ns
Break-Before-Make, tON - tOFF -10 --5-ns
IH5144, IH5145 Switch “ON” Time, tON Figure 8, Note 2 - 175 - - 250 - ns
Switch “OFF” Time, tOFF - 125 - - 150 - ns
Break-Before-Make, tON - tOFF -10 --5-ns
Switch “ON” Time, tON Figure 7 - 200 - - 300 - ns
Switch “OFF” Time, tOFF - 125 - - 150 - ns
NOTES:
1. Switching times are measured at 90% points.
2. Typical values are for design aid only, not guaranteed and not subject to production testing.
Typical Performance Curves
FIGURE 1. RDS(ON) vs TEMPERATURE AT±15V, +5V SUPPLIES FIGURE 2. RDS(ON) vs POWER SUPPLIES
IH5141 DATA
+25oC
+125oC
-55oC
90
80
70
60
50
40
30
20+10
RDS(ON) (Ω)
+8 +6 +4 +2 0 -2 -4 -6 -8 -10
ANALOG SIGNAL VOLTAGE (V)
100
90
80
60
50
40
30
20+10 +8 +6 +4 +2 0 -2 -4 -6 -8 -10
ANALOG SIGNAL VOLTAGE (V)
TA = +25oC IH5141 DATA
±5V, +5V SUPPLIES
±10V, +5V SUPPLIES
±15V, +5V SUPPLIES
RDS(ON) (Ω)
9-140
IH5140 Series
3A. 3B.
FIGURE 3. “OFF” ISOLATION vs FREQUENCY
4A. 4B.
FIGURE 4. POWER SUPPLY CURRENTS vs LOGIC STROBE RA TE
5A. 5B.
FIGURE 5. CHARGE INJECTION vs ANALOG SIGNAL
Typical Performance Curves (Continued)
-120
-100
-80
-60
-40
-20
0100 1K 10K 100K 1M 10M
VOUT/VANALOG (dB)
FREQUENCY (Hz)
COAX TO SCOPE
51Ω
-15V
VOUT
+15V
+5V
51Ω
C = 1µF
SOCKET ON COPPER GROUND PLANE JIG
VANALOG - 10VP-P
AT FREQUENCY
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
01 10 100 1000
τ - PERIOD OF PULSE REPETITION RATE (µs)
I (mA)
I+ SUPPLY
I- SUPPLY
IGND IL < 0.05mA FROM 1µs to DC
-15V
+15V
+5V τ
ρ
+3V
0V
+10V 100Ωρ = 400ns
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
NC CHANNEL PINS (3, 4)
NC CHANNEL PINS (1, 16)
+10
+5
0
-5
-10
-10 -5 0 +5 +10
ANALOG SIGNAL VOLTAGE (V)
VINJECT (mVP-P)
+100
-100
CHARGE (pC)
0.01µF
-15V
VINJECT
+15V
+5V
VA
0.01µF
VA
-VINJECT
0mV
0mV
+VINJECT
-VINJECT
+VINJECT
4µs
+3V 0V
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
IH5143
9-141
IH5140 Series
6A. 6B.
FIGURE 6. CHANNEL TO CHANNEL CROSS COUPLING REJECTION vs FREQUENCY
Test Circuits
FIGURE 7. IH5141 tON AND tOFF (3V DIGITAL INPUT)
FIGURE 8. IH5141 tON AND tOFF (15V DIGITAL INPUT)
Typical Performance Curves (Continued)
-120
-100
-80
-60
-40
-20
0100 1K 10K 100M 1M 10M
VOUT/VANALOG (dB)
FREQUENCY (Hz)
51Ω
-15V
VOUT
+15V
+5V
51Ω
C = 1µF
COPPER GROUND
(OFF CHANNEL)
COAX
TO
SCOPE
(ON CHANNEL)
PLANE JIG
1kΩ
+5V
10VP-P
AT FREQUENCY
= VANALOG
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
C
C
C
C
VOUT A
10pF 1kΩ
±10V
-15V
VOUT B
10pF 1kΩ
±10V
+5V
+15V
0V
+3V
TTL INPUT
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
IH5141
VOUT A
10pF 1kΩ+10V
-15V 0V
TTL
1N914
tON tOFF
LOGIC INPUT
0V
VOUT B
10pF 1kΩ
-10V
+15V
+15V TTL
INPUT
INPUT
+15V 0V
0V
0V
VOUT
VOUT
tON tOFF
+10V
+15V
-10V
NOTE: SWITCHING TIMES ARE MEASURED AT 90% POINTS
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
IH5141
9-142
IH5140 Series
9A. 9B.
FIGURE 9. IH5143 tON AND tOFF (15V DIGITAL INPUT)
FIGURE 10. IH5143 tON AND tOFF (3V DIGITAL INPUT)
Test Circuits (Continued)
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
IH5143
10pF 1kΩ
+10V
-15V
+10V
10pF 1kΩ
VOUT B
-10V
-10V +15V 0V
+15V
TTL INPUT
0V
-10V
+10V
90%
10%
T2L INPUT
VOUT A OR B
tOFF
tON
+15V
VOUT A
10pF 1kΩ
+10V
-15V
VOUT B
10pF 1kΩ
+5V
+15V
0V
+3V
TTL INPUT
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8+10V
+10V IH5143
Typical Applications
To maximize switching speed on the IH5140 family, TTL open
collector logic (15V with a 1kΩ or less collector resistor)
should be used. This configuration will result in (SPST) tON
and tOFF times of 80ns and 50ns, for signals between -10V
and +10V. The SPDT and DPST switches are approximately
30ns slower in both tON and tOFF with the same drive configu-
ration. 15V CMOS logic levels can be used (0V to +15V), but
propagation delays in the CMOS logic will slow down the
switching (typical 50ns → 100ns delays).
When driving the IH5140 Family from either +5V TTL or
CMOS logic, switching times run 20ns slower than if they
were driven from +15V logic levels. Thus tON is about 105ns,
and tOFF 75ns for SPST switches, and 135ns and 105ns
(tON, tOFF) for SPDT or DPST switches. The low level drive
can be made as fast as the high level drive if ±5V strobe lev-
els are used instead of the usual 0V → +3.0V drive. Pin 13 is
taken to -5V instead of the usual GND and strobe input is
taken from +5V to -5V levels as shown in Figure 11.
FIGURE 11.
The typical channel of the IH5140 family consists of both P
and N-channel MOSFETs. The N-channel MOSFET uses a
“Body Puller” FET to drive the body to -15V (±15V supplies)
to get good breakdown voltages when the switch is in the off
state (see Figure 12). This “Body Puller” FET also allows the
N-channel body to electrically float when the switch is in the
ANALOG
OUT
ANALOG
OUT
ANALOG IN
(CHANNEL A)
ANALOG IN
(CHANNEL B)
-15V
-5V
+5V
+15V -5V
+5V
CMOS
LEVEL
INPUT
STROBE
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
IH5141
9-143
IH5140 Series
on state producing a fairly constant RDS(ON) with different
signal voltages. While this “Body Puller” FET improves
switch performance, it can cause a problem when analog
input signals are present (negative signals only) and power
supplies are off. This fault condition is shown in Figure 13.
FIGURE 12.
Current will flow from -10V analog voltage through the drain
to body junction of Q1, then through the drain to body junc-
tion of Q3 to GND. This means that there is 10V across two
forward-biased silicon diodes and current will go to whatever
value the input signal source is capable of supplying. If the
analog input signal is derived from the same supplies as the
switch this fault condition cannot occur. Turning off the sup-
plies would turn off the analog signal at the same time.
ANALOG IN
ANALOG OUT
DQ2 ±15V FROM
DRIVERS
D
Q1
GS
B
G
S
G
Q3
S
B
-15V “BODY PULLER” FET
±15V FROM
DRIVERS D
SUBSTRATE FIGURE 13.
This fault situation can also be eliminated by placing a diode
in series with the negative supply line (pin 14) as shown in
Figure 14. Now when the power supplies are off and a nega-
tive input signal is present this diode is reverse biased and
no current can flow.
FIGURE 14.
ANALOG IN = -10V
Q2
GND WHEN POWER
SUPPLIES ARE OFF
N
Q1
N
P
Q3
SUBSTRATE
N
N
P
GND WHEN POWER
SUPPLIES ARE OFF
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
IH5141
-15V
+15V
+5V
INB
OUTB
OUTA
T2LBIN
T2LAIN
INA1N914
OR EQUIVALENT
Typical Switching Waveforms
(Scale: Vertical = 5V/DIV., Horizontal = 100ns/DIV.)
15A. -55oC 15B. +25oC
9-144
IH5140 Series
15C. +125oC
FIGURE 15. TTL OPEN COLLECTOR LOGIC DRIVE
(Corresponds to Figure 12)
16A. -55oC16B. +25oC
16C. +125oC
FIGURE 16. TTL OPEN COLLECTOR LOGIC DRIVE
(Corresponds to Figure 13)
Typical Switching Waveforms
(Scale: Vertical = 5V/DIV., Horizontal = 100ns/DIV.)
(Continued)
9-145
IH5140 Series
FIGURE 17. +25oC TTL OPEN COLLECTOR LOGIC DRIVE
(Corresponds to Figure 14) FIGURE 18. +25oC TTL OPEN COLLECTOR LOGIC DRIVE
(Corresponds to Figure 19)
Typical Applications
FIGURE 19. IMPROVED SAMPLE AND HOLD USING IH5143
FIGURE 20. USING THE CMOS SWITCH TO DRIVE AN R/2R LADDER NETWORK (2 LEGS)
Typical Switching Waveforms
(Scale: Vertical = 5V/DIV., Horizontal = 100ns/DIV.)
(Continued)
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
-15V
+5V
+15V LOGIC INPUT
IH5143
8007
3
27
4
6OUTPUT
-15V
+15V
51Ω
10,000pF
POLYSTYRENE
741HS
3
27
4
6
-15V
+15V
ANALOG
INPUT
+3V = > SAMPLE MODE
0V = > HOLD MODE
-15V
+5V
+15V
IH5143 +VANALOG
0V = > HOLD MODE
+VANALOG
-VANALOG
2R R
2RRR
ETC. ETC.
T2L LOGIC
STROBE
T2L LOGIC
STROBE
EXAMPLE: If -VANALOG = -10VDC and
+VANALOG = +10VDC then Ladder Legs
are switched between ±10VDC,
depending upon state of Logic Strobe.
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
9-146
IH5140 Series
FIGURE 21. DIGITALLY TUNED LOW POWER ACTIVE FILTER
Typical Applications (Continued)
8021
3M LO PASS
-
+
10,000pF
C
OUTPUT
8021
3M
-
+
10,000pF
CBANDPASS
OUTPUT
100kΩ
68kΩ
R
680kΩ
R
8021
3M
-
+
HI PASS
OUTPUT
100kΩ
1kΩ
680kΩ
R
68kΩ
R
100kΩ
100kΩ
SIGNAL
INPUT
100kΩ
IH5143
0V
3V
LOGIC STROBE
Constant gain, constant Q, variable frequency
filter which provides simultaneous Lowpass,
Bandpass, and Highpass outputs. With the
component values shown, center frequency will
be 235Hz and 23.5Hz for high and low logic
inputs respectively, Q = 100, and Gain = 100.
fNCenterFrequency 1
2πRC
==