ADS-946 ETC, ADS-946 Datasheet

ADS-946

Manufacturer Part Number

ADS-946

Description

ADS-946 14-Bit/ 8MHz Sampling A/D Converters

Manufacturer

ETC

Datasheet

1.ADS-946.pdf (8 pages)

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DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048 (U.S.A.)

FEATURES

GENERAL DESCRIPTION

The low-cost ADS-946 is a 14-bit, 8MHz sampling A/D

converter. This device accurately samples full-scale input

signals up to Nyquist frequencies with no missing codes.

Excellent differential nonlinearity error (DNL), signal-to-noise

ratio (SNR), and total harmonic distortion (THD) make the

ADS-946 the ideal choice for both time-domain (CCD/FPA

imaging, scanners, process control) and frequency-domain

(radar, telecommunications, spectrum analysis) applications.

The functionally complete ADS-946 contains a fast-settling

sample-hold amplifier, a subranging (two-pass) A/D converter,

an internal reference, timing/control logic, and error-correction

circuitry. Digital input and output levels are TTL. The

ADS-946 only requires the rising edge of a start convert

pulse to operate.

Requiring only ±5V supplies, the ADS-946 typically dissipates

just 2 Watts. The device is offered with a bipolar input range

of ±2V. Models are available for use in either commercial

(0 to +70°C) or military (–55 to +125°C) operating

14-bit resolution

8MHz guaranteed sampling rate

No missing codes over full military temperature range

Ideal for both time and frequency-domain applications

Excellent THD (–75dB) and SNR (77dB)

Edge-triggered; No pipeline delays

Small, 24-pin, ceramic DDIP or SMT

Requires only ±5V supplies

Low-power, 2 Watts

MIL-STD-883 screening optional

+5V ANALOG SUPPLY

+5V DIGITAL SUPPLY

–5V SUPPLY

ANALOG GROUND

DIGITAL GROUND

POWER AND GROUNDING

I N N O V A T I O N a n d E X C E L L E N C E

START CONVERT 18

OFFSET ADJUST 23

ANALOG INPUT 21

EOC 17

19, 24

CONTROL LOGIC

–

S/H

TIMING AND

Figure 1. ADS-946 Functional Block Diagram

AMP

BUFFER

REF

Tel: (508)339-3000 Fax: (508)339-6356

FLASH

ADC

DAC

temperature ranges. A proprietary, auto-calibrating, error-

correcting circuit allows the device to achieve specified

performance over the full military temperature range.

FUNCTION

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

INPUT/OUTPUT CONNECTIONS

Sampling A/D Converters

For immediate assistance: (800) 233-2765

14-Bit, 8MHz

ADS-946

FUNCTION

ANALOG GROUND

OFFSET ADJUST

+5V ANALOG SUPPLY

ANALOG INPUT

–5V SUPPLY

ANALOG GROUND

START CONVERT

EOC

BIT 14 (LSB)

BIT 13

DIGITAL GROUND

+5V DIGITAL SUPPLY

16 BIT 14 (LSB)

15 BIT 13

12 BIT 12

11 BIT 11

10 BIT 10

BIT 9

BIT 8

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1 (MSB)

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