BLOCK DIAGRAM
Figure 1. ADS-117 Functional Block Diagram
REF
REGISTER
REGISTER
3-STATE OUTPUT REGISTER
12 BIT 1 (MSB)
11 BIT 2
10 BIT 3
9 BIT 4
8 BIT 5
7 BIT 6
6 BIT 7
5 BIT 8
4 BIT 9
3 BIT 10
2 BIT 11
1 BIT 12 (LSB)
TIMING AND
CONTROL LOGIC
BIPOLAR 20
+10V REF. 21
START CONVERT 16
EOC 15
DIGITAL CORRECTION LOGIC
DAC
FLASH
ADC
COMP BIN 18
BUFFER
–
+
S/H
ANALOG INPUT 19
17 ENABLE (1-12)
S
2
S
1
13
+5V SUPPLY
22
+15V SUPPLY
23
ANALOG GROUND
14
DIGITAL GROUND
24
–15V SUPPLY
DATEL's ADS-117 is a functionally complete,
12-bit, 2MHz, sampling A/D converter. Its stan-
dard, 24-pin, double-width DIP contains a fast-
settling sample-hold amplifi er, a 12-bit subranging
(two-step) A/D converter, a precision reference,
three-state output register and all the timing and
control logic necessary to operate from a single
start convert pulse. Digital input and output levels
are TTL.
Total harmonic distortion (THD) and signal-
to-noise ratio (including distortion) typically run
–78dB and 70dB, respectively, with full scale
inputs up to 100kHz. The ADS-117 requires ±15V
and +5V power supplies and typically consumes
1.6 Watts. Models are available for use in either
commercial (0 to +70°C) or military (–55 to
+125°C) operating temperature ranges and
extended commerical (–40 to +85°C).
PRODUCT OVERVIEW
FEATURES
12-bit resolution
No missing codes
2MHz minimum throughput
Functionally complete
Small 24-pin DDIP
Low-power, 1.6 Watts
Three-state output buffers
Samples to Nyquist frequencies
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION PIN FUNCTION
1BIT 12 (LSB) 24 –15V Supply
2 BIT 11 23 ANALOG GROUND
3 BIT 10 22 +15V SUPPLY
4 BIT 9 21 +10V REFERENCE
5 BIT 8 20 BIPOLAR
6 BIT 7 19 ANALOG INPUT
7 BIT 6 18 COMP BIN
8 BIT 5 17 ENABLE (1-12)
9 BIT 4 16 START CONVERT
10 BIT 3 15 EOC
11 BIT 2 14 DIGITAL GROUND
12 BIT 1 (MSB) 13 +5V SUPPLY
ADS-117
12-Bit, 2MHz, Low-Power Sampling A/D Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
31 Mar 2011 MDA_ADS-117.B02 Page 1 of 6
ABSOLUTE MAXIMUM RATINGS
PARAMETERS LIMITS UNITS
+15V Supply (Pin 22) 0 to +16 Volts
–15V Supply (Pin 24) 0 to –16 Volts
+5V Supply (Pin 13) 0 to +6.0 Volts
Digital Inputs (Pin 16, 17, 18) –0.3 to +VDD +0.3 Volts
Analog Input (Pin 19) –9 to +15 Volts
Lead Temp. (10 seconds) +300 °C
➀ See Table 1 also
➁ Same specifi cations for in-band harmonics.
(SNR + Distortion) – 1.76 + 20 log Full Scale Amplitude
Actual Input Amplitude
6.02
➂ Effective bits is equal to:
➃ For ±12V, +5V operation, contact DATEL.
Staight binary/Offset binary
Complementary binary
Complementary offset binary
FUNCTIONAL SPECIFICATIONS
(TA = +25°C, ±VCC = +15V, +VDD =+5V, 2MHz sampling rate, and a minimum 3 minute
warmup unless otherwise specifi ed.)
ANALOG INPUTS MIN. TYP. MAX. UNITS
Input Voltage Range ➀
Bipolar — ±5 — Volts
Unipolar — 0 to +10 — Volts
Input Impedence 4.5 5 — kΩ
Input Capacitance — 6 15 pF
DIGITAL INPUTS
Logic Levels
Logic "1" +2.0 — — Volts
Logic "0" — — +0.8 Volts
Logic Loading "1" — — +5 μA
Logic Loading "0" — — –600 μA
PERFORMANCE
Resolution 12 Bits
No Missing Codes
(12 Bits; fin = 1MHz) 0 to +70°C
Integral Non-Linearity
0 to +70°C — ±1/2 ±3 LSB
–55 to +125°C — ±1 ±4 LSB
Differential Non-Linearity
0 to +70°C — ±1/2 ±0.95 LSB
–55 to +125°C / –45 to +85°C — ±1 +1.5 LSB
Full Scale Absolute Accuracy
(see Tech Note 1)
0 to +70°C — ±0.13 ±0.44 %FSR
–55 to +125°C / –45 to +85°C — ±0.25 ±0.73 %FSR
Unipolar/Bipolar Zero Error
0 to +70°C (see Tech Note 1) — ±0.07 ±0.38 %FSR
–55 to +125°C / –45 to +85°C — ±0.22 ±0.73 %FSR
Bipolar Offset Error
0 to +70°C (see Tech Note 1) — ±0.1 ±0.38 %FSR
–55 to +125°C / –45 to +85°C — ±0.53 ±0.73 %FSR
Gain Error (see Tech Note 1)
0 to +70°C — ±0.1 ±0.38 %
–55 to +125°C / –45 to +85°C — ±0.53 ±0.73 %
Internal Reference Voltage
0 to +70°C +9.97 +10.0 +10.03 Volts
–55 to +125°C / –45 to +85°C +9.95 — +10.05 Volts
External Current — — 1.5 mA
DYNAMIC PERFORMANCE
Spurious Free Dynamic Range ( –0.5dB) ➁
dc to 100kHz — –81 — dB
100kHz to 500kHz — –75 –70 dB
500kHz to 1MHz — –70 — dB
Total Harm. Distort. (–0.5dB)
dc to 100kHz — –78 — dB
100kHz to 500kHz — –73 – 68 dB
500kHz to 1MHz — –71 — dB
ADS-117
12-Bit, 2MHz, Low-Power Sampling A/D Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
DYNAMIC PERF. (cont) MIN. TYP. MAX. UNITS
Input Bandwith (–3dB)
Small Signal (–20dB input) 8 10 — MHz
Large Signal (–0.5dB input) 7 9 — MHz
Feedthrough (1MHz) –72 –74 — dB
SNR (wo/distortion, –0.5dB)
dc to 100kHz
0 to +70°C — 72 — dB
–55 to +125°C / –45 to +85°C — 72 — dB
100kHz to 500kHz
0 to +70°C 65 70 — dB
–55 to +125°C / –45 to +85°C 65 70 — dB
500kHz to 1MHz
0 to +70°C — 70 — dB
–55 to +125°C / –45 to +85°C — 70 — dB
SNR (and distort., –0.5dB) ➂
dc to 100kHz
0 to +70°C — 70 — dB
–55 to +125°C / –45 to +85°C — 69 — dB
100kHz to 500kHz
0 to +70°C 64 70 — dB
–55 to +125°C / –45 to +85°C 62 69 — dB
500kHz to 1MHz
0 to +70°C — 69 — dB
–55 to +125°C / –45 to +85°C — 69 — dB
Two-tone Intermodulation Distortion
(fin = 970kHz, 990kHz,
fs = 2Mhz, –0.5dB) — –68 — dB
Slew Rate — ±210 — V/μs
Effect. Aperture Delay Time — — 16 ns
Overvoltage Recovery Time; 20% — — 500 ns
S/H Acq. Time, (to ±0.01%)
0 to +70°C — 155 165 ns
–55 to +125°C / –45 to +85°C — 160 170 ns
Conversion Rate 2 — — MHz
OUTPUTS
Output Coding
Pin 18 High
Pin 18 Low
Logic Level
Logic "1" +2.4 — — Volts
Logic "0" — — +0.4 Volts
Logic Loading "1" — — –160 μA
Logic Loading "0" — — +6.4 mA
POWER REQUIREMENTS
Power Supply Ranges ➃
+15V Supply +14.25 +15.0 +15.75 Volts
–15V Supply –14.25 –15.0 –15.75 Volts
+5V Supply +4.75 +5.0 +5.25 Volts
Power Supply Current
+15V Supply — +48 +58 mA
–15V Supply — –35 –45 mA
+5V Supply — +75 +85 mA
Power Dissipation — 1.6 1.9 Watts
Power Supply Rejection — — ±0.07 %FSR%V
31 Mar 2011 MDA_ADS-117.B02 Page 2 of 6
TECHNICAL NOTES
is compatible with CMOS/TTL logic levels for those users desiring
dynamic control of this function. Do not change COMP BIN status while
EOC is high.
5. To enable the three-state outputs, connect ENABLE (pin 17) to a logic
"0" (low). To disable, connect pin 17 to a logic "1" (high).
6. To meet the guaranteed conversion rate, a maximum start convert pulse
is specifi ed. A wider start convert pulse will result in slower conversion
rates. An initial start convert pulse is required before performing an
actual conversion after power-up to assure the sample-hold is in the
acquisition mode.
Figure 2 shows the relationship between the various input signals. The
timing shown applies over the operating temperature range and over
the operating power supply range.
7. Re-initiating the START CONVERT (pin 16) while EOC is a logic "1" (high)
will result in a new conversion sequence.
1. Applications which are unaffected by endpoint errors or remove them
through software will use the typical connections shown in Figure 3.
Remove system errors or adjust the small initial errors of the ADS-117
to zero using the optional external circuitry shown in Figure 4. The
external adjustment circuit has no effect on the throughput rate.
2. Always connect the analog and digital grounds to a ground plane
beneath the converter for best performance. The analog and digital
grounds are not connected to each other internally.
3. Bypass the analog and digital supplies and the +10V reference (pin 21)
to ground with 4.7μF, 25V tantalum electrolytic capacitors in parallel
with 0.1μF ceramic capacitors. Bypass the +10V reference (pin 21) to
ANALOG GROUND (pin 23).
4. Obtain straight binary/offset binary output coding by tying COMP BIN
(pin 18) to +5V or leaving it open. The device has an internal pull-up
resistor on this pin. To obtain complementary binary or complementary
offset binary output coding, tie pin 18 to ground. The pin 18 signal
Figure 2. ADS-117 Timing Diagram
START
CONVERT
INTERNAL S/H
NN+1
Acquisition Time
165ns typ.
170ns max.
10ns min.
25ns max.
EOC
10ns min.
17ns max.
Conversion Time
325ns typ.
60ns max.
Note: Scale is approximately 25ns per division.
35ns max.
OUTPUT
DATA DATA N-1 VALID
INVALID
DATA
DATA N VALID
350ns min. INVALID
DATA
150ns max.
50ns typ.,
30ns min., 60ns max.
Hold
FUNCTIONAL SPECIFICATIONS. CONT.
PHYSICAL/ENVIRONMENTAL
Operating Temp. Range, Case
ADS-117MC 0 — +70 °C
ADS-117ME –45 — +85 °C
ADS-117MM, 883 –55 — +125 °C
Storage Temperature Range –65 — +150 °C
Thermal Impedance
θjc — 3 — °C/W
θca — 23 — °C/W
Package Type 24-pin, metal-sealed, ceramic DDIP
Weight 0.42 ounces (12 grams)
ADS-117
12-Bit, 2MHz, Low-Power Sampling A/D Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
31 Mar 2011 MDA_ADS-117.B02 Page 3 of 6
CALIBRATION PROCEDURE
1. Connect the converter per Figure 3, Figure 4, and Table 1 for the ap-
propriate input range. Apply a pulse of 150 nanoseconds to the START
CONVERT input (pin 16) at a rate of 250kHz. This rate is chosen to
reduce fl icker if LED’s are used on the outputs for calibration purposes.
2. Zero Adjustments
Apply a precision voltage reference source between the amplifi er’s
analog input and ground. Adjust the output of the reference source per
Table 2. For unipolar, adjust the zero trimming potentiometer so that
the output code fl ickers equally between 0000 0000 0000 and 0000
0000 0001 with the pin 18 tied high (straight binary) or between 1111
1111 1111 and 1111 1111 1110 with the pin 18 tied low (complemen-
tary binary).
For bipolar operation, adjust the potentiometer such that the code fl ick-
ers equally between 1000 0000 0000 and 1000 0000 0001 with pin 18
tied high (offset binary) or between 0111 1111 1111 and 0111 1111
1110 with pin 18 tied low (complementary offset binary).
3. Full-Scale Adjustment
Set the output of the voltage reference used in step 2 to the value
shown in Table 1. Adjust the gain trimming potentiometer so that the
output code fl ickers equally between 1111 1111 1110 and 1111 1111
1111 for pin 18 tied high or between 0000 0000 0001 and 0000 0000
0000 for pin 18 tied low.
4. To confi rm proper operation of the device, vary the precision reference
voltage source to obtain the output coding listed in Table 3.
Figure 3. ADS-117 Connection Diagram
To Pin19
of ADS-117
–15V
+15V
For values of R1 and R2 refer to Table 1.
R2
R1
5kΩ
50Ω
10kΩ
ZERO/
OFFSET
ADJUST
SIGNAL
INPUT
GAIN
ADJUST
5kΩ
➀
➀
➀
Figure 4. Optional Calibration Circuit
0.1μF
4.7μF
13
14
ADS-117
19
16
12
11
10
9
8
7
6
5
4
3
2
1
15
17
BIT 1 (MSB)
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8
BIT 9
BIT 10
BIT 11
BIT 12 (LSB)
EOC
ENABLE (1-12)
ANALOG INPUT
START CONVER
T
+
+5V
–15V
+15V +
+
0.1μF
4.7μF
23
22
0.1μF
4.7μF
24
20
COMP BIN
0.1μF
+
4.7μF
21 +10V REF.
UNIPOLAR
OPERATION
18 +5V
NOTE:
BIPOLAR INPUT
For unipolar operation, ground pin 20.
For bipolar operation, connect pin 20 to pin 21.
Always bypass pin 21 as shown for both unipolar
and bipolar operation.
Table 1. Input Connections (using external calibration)
INPUT RANGE R1 R2 UNIT
0 +10V, ±5 2 2 kΩ
0 to 5V, ±2.5V 2 6 kΩ
0 to +2.5V, ±1.25V 2 14 kΩ
Table 2. Zero and Gain Adjustments
INPUT RANGE ZERO ADJUST
+1/2 LSB
GAIN ADJUST
RANGE
0 to +10V +1.22mV +9.9963V
±5V +1.22mV +4.9963V
ADS-117
12-Bit, 2MHz, Low-Power Sampling A/D Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
31 Mar 2011 MDA_ADS-117.B02 Page 4 of 6
Figure 5. FFT Analysis of ADS-117
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
Frequency (MHz)
(fs = 2MHz, fin = 980kHz, Vin = –0.5dB, 4,096-point FFT)
Amplitude Relative to Full Scale (dB)
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.
0
Table 3. Output Coding
STRAIGHT BIN. COMP. BINARY
UNIPOLAR
SCALE
INPUT RANGE
0 to +10V
OUTPUT CODING INPUT RANGE
±5V
BIPOLAR
SCALE
MSB LSB MSB LSB
+FS – 1 LSB
+7/8 FS
+3/4 FS
+1/2 FS
+1/4 FS
+1/8 FS
+1 LSB
0
+9.9976
+8.7500
+7.5000
+5.0000
+2.5000
+1.2500
+0.0024
0.0000
1111
1110
1100
1000
0100
0010
0000
0000
1111
0000
0000
0000
0000
0000
0000
0000
1111
0000
0000
0000
0000
0000
0001
0000
0000
0001
0011
0111
1011
1101
1111
1111
0000
1111
1111
1111
1111
1111
1111
1111
0000
1111
1111
1111
1111
1111
1110
1111
+4.9976
+3.7500
+2.5000
0.0000
–2.5000
–3.7500
–4.9976
–5.0000
+FS –1 LSB
+3/4FS
+1/2FS
0
–1/2FS
–3/4FS
–FS+1LSB
–FS
OFF. BINARY COMP. OFF. BIN.
ADS-117
12-Bit, 2MHz, Low-Power Sampling A/D Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
31 Mar 2011 MDA_ADS-117.B02 Page 5 of 6
MECHANICAL DIMENSIONS INCHES (mm)
ORDERING INFORMATION
MODEL NUMBER OPERATING TEMP. RANGE ACCESSORIES
ADS-117MC 0 to +70°C ADS-EVAL1 Evaluation Board (without ADS-117)
ADS-117ME –40 to +85°C HS-24 Heat Sink for all ADS-117 models
ADS-117MM –55 to +125°C
ADS-117/883 –55 to +125°C
For MIL-STD-883 product specifi cation or availability of surface-mount packaging, contact DATEL. Receptacles for PC mounting can be ordered through AMP
Inc., Part # 3-331272-8 (Component Lead Socket), 24 required.
0.200 MAX.
(5.080)
0.235 MAX.
(5.969)
0.600 ±0.010
(15.240)
0.80 MAX.
(20.32)
0.100 TYP.
(2.540)
0.100
(2.540)
0.018 ±0.002
(0.457)
0.100
(2.540)
0.040
(1.016)
1.31 MAX.
(33.27)
112
13
24
1.100
(27.940)
0.190 MAX.
(4.826)
0.010
(0.254)
+0.002
–0.001
SEATING
PLANE
0.025
(0.635)
Dimension Tolerances (unless otherwise indicated):
2 place decimal (.XX) ±0.010 (±0.254)
3 place decimal (.XXX) ±0.005 (±0.127)
Lead Material: Kovar alloy
Lead Finish: 50 microinches (minimum) gold plating
over 100 microinches (nominal) nickel plating
PIN 1 INDEX
ADS-117
12-Bit, 2MHz, Low-Power Sampling A/D Converters
. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not
imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change
without notice.
www.datel.com • e-mail: help@datel.com
®®
DATEL
11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA
ITAR and ISO 9001/14001 REGISTERED
31 Mar 2011 MDA_ADS-117.B02 Page 6 of 6
