ADS-950MC ETC, ADS-950MC Datasheet

ADS-950MC

Manufacturer Part Number

ADS-950MC

Description

18-Bit/ 500kHz/ Low-Power Sampling A/D Converters

Manufacturer

ETC

Datasheet

1.ADS-950MC.pdf (6 pages)

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PRELIMINARY PRODUCT DATA

FEATURES

· 18-bit resolution

· 500kHz minimum sampling rate

· No missing codes over full military temperature range

· Very low power, 1.45 Watts

· Small, 32-pin, side-brazed, ceramic TDIP

· Edge-triggered

· Excellent performance

· Ideal for both time and frequency-domain applications

· Low cost

GENERAL DESCRIPTION

The low-cost ADS-950 is an 18-bit, 500kHz sampling A/D

converter. This device accurately samples full-scale input

signals up to Nyquist frequencies with no missing codes. This

feature, combined with excellent signal-to-noise ratio (SNR)

and total harmonic distortion (THD), makes the ADS-950 the

ideal choice for both time-domain (medical imaging, scanners,

process control) and frequency-domain (radar, telecommunica-

tions, spectrum analysis) applications.

Packaged in a 32-pin, side-brazed, metal-sealed, ceramic

TDIP, the functionally complete ADS-950 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, and

the ADS-950 only requires the rising edge of the start convert

pulse to operate.

Requiring ±15V and ±5V supplies, the ADS-950 typically

dissipates 1.45 Watts. The device is offered with a bipolar

(±5V) analog input range. Models are available for use in

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

DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508) 339-3000, (800) 233-2765 Fax: (508) 339-6356 · Email: sales@datel.com · Internet: www.datel.com

+5V REFERENCE OUT 5

START CONVERT 16

COMPENSATION 7

ANALOG INPUT 4

GAIN ADJUST 6

EOC 15

+5V ANALOG

SUPPLY

CIRCUIT

GAIN

Figure 1. ADS-950 Functional Block Diagram

CONTROL LOGIC

–

S/H

TIMING AND

–5V ANALOG

SUPPLY

GROUND

ANALOG

3, 12

AMP

BUFFER

REF

+5V DIGITAL

operating temperature ranges. A proprietary, auto-calibrating,

error-correcting circuit enables the device to achieve specified

performance over the full military temperature range.

SUPPLY

FLASH

ADC

DAC

ADC

BIT 2

BIT 1 (MSB)

ANALOG GROUND

ANALOG INPUT

+5V REFERENCE OUT

GAIN ADJUST

COMPENSATION

–15V SUPPLY

+15V SUPPLY

+5V ANALOG SUPPLY

–5V ANALOG SUPPLY

ANALOG GROUND

DIGITAL GROUND

+5V DIGITAL SUPPLY

EOC

START CONVERT

FUNCTION

SUPPLY

+15V

INPUT/OUTPUT CONNECTIONS

18-Bit, 500kHz, Low-Power

Sampling A/D Converters

SUPPLY

–15V

GROUND

DIGITAL

32 BIT 3

31 BIT 4

30 BIT 5

29 BIT 6

28 BIT 7

27 BIT 8

26 BIT 9

25 BIT 10

24 BIT 11

23 BIT 12

22 BIT 13

21 BIT 14

20 BIT 15

19 BIT 16

18 BIT 17

17 BIT 18 (LSB)

BIT 1 (MSB)

BIT 2

ADS-950

BIT 3

BIT 4

BIT 5

BIT 6

BIT 7

BIT 8

BIT 9

BIT 10

BIT 11

BIT 12

BIT 13

BIT 14

BIT 15

BIT 16

BIT 17

BIT 18 (LSB)

FUNCTION

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