DATEL ADS-117 Service Manual

®®

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

查询ADS-117供应商查询ADS-117供应商

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

ADS-117

12-Bit, 2MHz, Low-Power

Sampling A/D Converters

GENERAL DESCRIPTION

DATEL's ADS-117 is a functionally complete, 12-bit, 2MHz,
sampling A/D converter. Its standard, 24-pin, double-width
DIP contains a fast-settling sample-hold amplifier, 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 ADS­117 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.

INPUT/OUTPUT CONNECTIONS

PIN FUNCTION PIN FUNCTION

1 BIT 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

DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) • Tel: [phone] Fax: [phone] • For immediate assistance: [phone]

Figure 1. ADS-117 Functional Block Diagram

ADS-117

®®

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

FUNCTIONAL SPECIFICATIONS

(TA = +25°C, ±VCC = +15V, +VDD =+5V, 2MHz sampling rate, and a minimum 3 minute
warmup unless otherwise specified.)

ANALOG INPUTS MIN. TYP. MAX. UNITS

Input Voltage Range

Bipolar — ±5 — Volts
Unipolar — 0 to +10 — Volts

Input Impedence 4.5 5 — k
Input Capacitance —615pF

DIGITAL INPUTS

Logic Levels

Logic "1" +2.0 — — Volts
Logic "0" — — +0.8 Volts
Logic Loading "1" — — +5 µA
Logic Loading "0" — — –6 00 µA

PERFORMANCE

Resolution 12 Bits
No Missing Codes

(12 Bits; fin = 1MHz) 0 to +70°C

Integral Non-Linearity

0°C to +70°C — ±1/2 ±3 LSB
–55°C to +125°C — ±1 ±4 LSB

Differential Non-Linearity

0°C to +70°C — ±1/2 ±0.95 LSB
–55°C to +125°C — ±1 +1.5 LSB

Full Scale Absolute Accuracy

(see Tech Note 1)

0°C to +70°C — ±0.13 ±0.44 %FSR
–55°C to +125°C — ±0.25 ±0.73 %FSR

Unipolar/Bipolar Zero Error

0°C to +70°C (see Tech Note 1) — ±0.07 ±0.38 %FSR
–55°C to +125°C — ±0.22 ±0.73 %FSR

Bipolar Offset Error

0°C to +70°C (see Tech Note 1) — ±0.1 ±0.38 %FSR
–55°C to +125°C — ±0.53 ±0.73 %FSR

Gain Error (see Tech Note 1)

0°C to +70°C — ±0.1 ±0.38 %
–55°C to +125°C — ±0.53 ±0.73 %

Internal Reference Voltage

0°C to +70°C +9.97 +10.0 +10.03 Volts
–55°C to +125°C +9.95 — +10.05 Volts

External Current ——1.5mA

DYNAMIC PERFORMANCE

Spurious Free Dynamic
Range (–0.5dB)

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

Input Bandwith (–3dB)

Small Signal (–20dB input) 8 10 — MHz
Large Signal (–0.5dB input) 7 9 — MHz

Feedthrough (1MHz) –72 –74 — dB

➀

See Table 1 also

➁

Same specifications for in-band harmonics.

➀

Ω

➁

DYNAMIC PERF. (cont) MIN. TYP. MAX. UNITS

SNR (wo/distortion, –0.5dB)

dc to 100kHz
0°C to +70°C — 72 — dB
–55°C to +125°C — 72 — dB
100kHz to 500kHz
0°C to +70°C 65 70 — dB
–55°C to +125°C 65 70 — dB
500kHz to 1MHz
0°C to +70°C — 70 — dB
–55°C to +125°C — 70 — dB

SNR (and distort., –0.5dB)

dc to 100kHz
0°C to +70°C — 70 — dB
–55°C to +125°C — 69 — dB
100kHz to 500kHz
0°C to +70°C 64 70 — dB
–55°C to +125°C 62 69 — dB
500kHz to 1MHz
0°C to +70°C — 69 — dB
–55°C to +125°C — 69 — dB

Two-tone Intermodulation
Distortion (fin = 970kHz,

990kHz, f

s = 2Mhz,

–0.5dB) — –68 — dB

Slew Rate — ±210 — V/µs
Effect. Aperture Delay Time ——16ns
Overvoltage Recovery
Time; 20% — — 500 ns
S/H Acq. Time, (to ±0.01%)

0 to +70°C — 155 165 ns
–55°C to +125°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

+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

PHYSICAL/ENVIRONMENTAL

Operating Temp. Range, Case

ADS-117MC 0 — +70 °C
ADS-117MM, 883 –55 — +125 °C

Storage Temperature Range –65 — +150 °C
Thermal Impedance

θ

jc — 3 — °C/W

θ

ca — 23 — °C/W

Package Type 24-pin, metal-sealed, ceramic DDIP
Weight 0.42 ounces (12 grams)

➂

Effective bits is equal to:

(SNR + Distortion) – 1.76 + 20 log

➃

For ±12V, +5V operation, contact DATEL

➂

Staight binary/Offset binary

Complementary binary

Complementary offset binary

➃

Full Scale Amplitude

Actual Input Amplitude

6.02

2

®®

TECHNICAL NOTES

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

ADS-117

output coding, tie pin 18 to ground. The pin 18 signal 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 specified. 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.

START

CONVERT

INTERNAL S/H

EOC

OUTPUT

DATA

NN+1

50ns typ.,
30ns min., 60ns max.

10ns min.
25ns max.

Hold

10ns min.
17ns max.

Conversion Time

325ns typ.

DATA N-1 VALID

350ns min.

Note: Scale is approximately 25ns per division.

Figure 2. ADS-117 Timing Diagram

Acquisition Time

165ns typ.

170ns max.

INVALID

DATA

150ns max.

60ns max.

35ns max.

DATA N VALID

INVALID

DATA

3

ADS-117

T

®®

CALIBRATION PROCEDURE

1. Connect the converter per Figure 3, Figure 4, and Table 1
for the appropriate 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 flicker if
LED’s are used on the outputs for calibration purposes.

2. Zero Adjustments

Apply a precision voltage reference source between the
amplifier’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 flickers
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 (comple­mentary binary).

For bipolar operation, adjust the potentiometer such that
the code flickers 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 flickers 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 confirm proper operation of the device, vary the preci­sion reference voltage source to obtain the output coding
listed in Table 3.

➀

R2

+15V

–15V

10kΩ

ZERO/
OFFSET
ADJUST

To Pin19
of ADS-117

SIGNAL

INPUT

➀

R1

5kΩ

50

Ω

GAIN

ADJUST

5k

Ω

For values of R1 and R2 refer to Table 1.

➀

Figure 4. Optional Calibration Circuit

Table 1. Input Connections (using external calibration)

INPUT RANGE R1 R2 UNIT

0 +10V, ±5 2 2 k Ω

0 to 5V, ±2.5V 2 6 k Ω

0 to +2.5V, ±1.25V 2 14 k Ω

Table 2. Zero and Gain Adjustments

Input Zero Adjust Gain Adjust

Range +1/2 LSB +FS – 1 1/2 LSB

0 to +10V +1.22mV +9.9963V

±5V +1.22mV +4.9963V

–15V

+15V

+5V

0.1µF

4.7µF

4.7µF

4.7µF

UNIPOLAR

OPERATION

4.7µF

0.1µF

+

0.1µF

+

+

0.1µF

12

20

BIPOLAR INPUT

+10V REF.

21

+

24

ADS-117

23

22

13

14

For unipolar operation, ground pin 20.

NOTE:

COMP BIN

18 +5V

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

BIT 11

2

BIT 12 (LSB)

1

EOC

15

ENABLE (1-12)

17

16

START CONVER

19

ANALOG INPUT

For bipolar operation, connect pin 20 to pin 21.
Always bypass pin 21 as shown for both unipolar
and bipolar operation.

Figure 3. ADS-117 Connection Diagram

4

®®

0

STRAIGHT BIN. COMP. BINARY

UNIPOLAR INPUT RANGE OUTPUT CODING INPUT RANGE BIPOLAR

SCALE 0 to +10V MSB LSB MSB LSB ±5V SCALE

+FS – 1 LSB +9.9976 1111 1111 1111 0000 0000 0000 +4.9976 +FS –1 LSB

+7/8 FS +8.7500 1110 0000 0000 0001 1111 1111 +3.7500 +3/4FS
+3/4 FS +7.5000 1100 0000 0000 0011 1111 1111 +2.5000 +1/2FS
+1/2 FS +5.0000 1000 0000 0000 0111 1111 1111 0.0000 0
+1/4 FS +2.5000 0100 0000 0000 1011 1111 1111 –2.5000 –1/2FS
+1/8 FS +1.2500 0010 0000 0000 1101 1111 1111 –3.7500 –3/4FS

+1 LSB +0.0024 0000 0000 0001 1111 1111 1110 –4.9976 –FS+1LSB

0 0.0000 0000 0000 0000 1111 1111 1111 –5.0000 –FS

OFF. BINARY COMP. OFF. BIN.

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

Amplitude Relative to Full Scale (dB)

–110

–120

–130

–140

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.

ADS-117

Table 3. Output Coding

Frequency (MHz)

(fs = 2MHz, fin = 980kHz, Vin = –0.5dB, 4,096-point FFT)

Figure 5. FFT Analysis of ADS-117

5

ADS-117

I

0.235 MAX.
(5.969)

MECHANICAL DIMENSIONS INCHES (mm)

1.31 MAX.
(33.27)

Dimension Tolerances
2 place decimal (.XX) ±0.010 (±0.254)

24

112

0.100 TYP.
(2.540)

1.100

(27.940)

PIN 1 INDEX

13

0.80 MAX.
(20.32)

0.200 MAX.
(5.080)

3 place decimal (.XXX) ±0.005 (±0.127)

Lead Material:

Lead Finish:
over 100 microinches (nominal) nickel plating

®®

(unless otherwise indicated):

Kovar alloy

50 microinches (minimum) gold plating

+0.002

0.010

–0.001

0.190 MAX.
(4.826)

0.018 ±0.002
(0.457)

0.100

(2.540)

(1.016)

0.040

SEATING

PLANE

0.025

(0.635)

(0.254)

0.600 ±0.010
(15.240)

0.100

(2.540)

ORDERING INFORMATION

MODEL NUMBER OPERATING TEMP. RANGE

ADS-117MC 0 to +70°C
ADS-117MM –55 to +125°C
ADS-117/883 –55 to +125°C

For MIL-STD-883 product specification 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.

ACCESSORIES

ADS-EVAL1 Evaluation Board (without ADS-117)
HS-24 Heat Sink for all ADS-117 models

®®

DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: [phone] [phone] Fax: [phone]
Internet: www.datel.com E-mail:[e-mail]

SO 9001

ISO 9001



DATEL (UK) LTD. Tadley, England Tel: [phone]
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: [phone]
DATEL GmbH München, Germany Tel: [phone]

DS-0230F 07/04

DATEL KK Tokyo, Japan Tel: [phone], Osaka Tel: [phone]
DATEL China, Shanghai, China Tel:[phone]

DATEL 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. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.