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