ADS-117/883 - C&D Technologies, Inc.

®®

Figure 1. ADS-117 Functional Block Diagram

DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) • Tel: (508) 339-3000 Fax: (508) 339-6356 • For immediate assistance: (800) 233-2765

ADS-117

12-Bit, 2MHz, Low-Power

Sampling A/D Converters

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

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 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.

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

REF

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)

+5V SUPPLY

+15V SUPPLY

ANALOG GROUND

DIGITAL GROUND

–15V SUPPLY

®®

ADS-117

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

➀

Bipolar — ±5 — Volts

Unipolar — 0 to +10 — Volts

Input Impedence 4.5 5 — k

Ω

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" — — –600 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)

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

Input Bandwith (–3dB)

Small Signal (–20dB input) 8 10 — MHz

Large Signal (–0.5dB input) 7 9 — MHz

Feedthrough (1MHz) –72 –74 — dB

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)

➂

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, fs = 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

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

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

jc — 3 — °C/W

ca — 23 — °C/W

Package Type 24-pin, metal-sealed, ceramic DDIP

Weight 0.42 ounces (12 grams)

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

6.02

(SNR + Distortion) – 1.76 + 20 log Full Scale Amplitude

Actual Input Amplitude

➂

Effective bits is equal to:

➀

See Table 1 also

➁

Same specifications for in-band harmonics.

➃

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

Staight binary/Offset binary

Complementary binary

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 acquisi-

tion 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.

TECHNICAL NOTES

1. Applications which are unaffected by endpoint errors or

remove them through software will use the typical connec-

tions 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

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

®®

ADS-117

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 (comple-

mentary 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 potentiom-

eter 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 preci-

sion reference voltage source to obtain the output coding

listed in Table 3.

To Pin19

of ADS-117

–15V

+15V

For values of R1 and R2 refer to Table 1.

5kΩ

50Ω

10kΩ

ZERO/

OFFSET

ADJUST

SIGNAL

INPUT

GAIN

ADJUST

5kΩ

➀

Figure 3. ADS-117 Connection Diagram

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

Figure 4. Optional Calibration Circuit

0.1µF

4.7µF

ADS-117

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

+5V

–15V

+15V +

0.1µF

4.7µF

0.1µF

4.7µF

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.

®®

ADS-117

Table 3. Output Coding

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

STRAIGHT BIN. COMP. BINARY

OFF. BINARY COMP. OFF. BIN.

Figure 5. FFT Analysis of ADS-117

–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.

®®

ADS-117

®®

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.

DS-0230F 07/04

MECHANICAL DIMENSIONS INCHES (mm)

ORDERING INFORMATION

ACCESSORIES

ADS-EVAL1 Evaluation Board (without ADS-117)

HS-24 Heat Sink for all ADS-117 models

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.

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

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

ISO 9001

SO 9001



DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151

Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356

Internet: www.datel.com E-mail:sales@datel.com

DATEL (UK) LTD. Tadley, England Tel: (01256)-880444

DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 1-34-60-01-01

DATEL GmbH München, Germany Tel: 89-544334-0

DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-6354-2025

DATEL China, Shanghai, China Tel:011-86-51317199