ADS-946 データシートの表示（PDF） - DATEL Data Acquisition products

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ADS-946

14-Bit, 8MHz, sampling A/D converter

DATEL Data Acquisition products  

®

®

INNOVATION and EXCELLENCE

ADS-946

14-Bit, 8MHz

Sampling A/D Converters

FEATURES

• 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

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

INPUT/OUTPUT CONNECTIONS

PIN FUNCTION

PIN FUNCTION

1

BIT 1 (MSB)

2

BIT 2

3

BIT 3

4

BIT 4

5

BIT 5

6

BIT 6

7

BIT 7

8

BIT 8

9

BIT 9

10 BIT 10

11 BIT 11

12 BIT 12

24 ANALOG GROUND

23 OFFSET ADJUST

22 +5V ANALOG SUPPLY

21 ANALOG INPUT

20 –5V SUPPLY

19 ANALOG GROUND

18 START CONVERT

17 EOC

16 BIT 14 (LSB)

15 BIT 13

14 DIGITAL GROUND

13 +5V DIGITAL SUPPLY

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

correcting circuit allows the device to achieve specified

performance over the full military temperature range.

OFFSET ADJUST 23

ANALOG INPUT 21

POWER AND GROUNDING

+5V ANALOG SUPPLY 22

+5V DIGITAL SUPPLY 13

–5V SUPPLY

20

ANALOG GROUND 19, 24

DIGITAL GROUND

14

START CONVERT 18

EOC 17

–

S/H

+

BUFFER

FLASH

ADC

1

REF

DAC

Σ

AMP

FLASH

ADC

2

TIMING AND

CONTROL LOGIC

16 BIT 14 (LSB)

15 BIT 13

12 BIT 12

11 BIT 11

10 BIT 10

9 BIT 9

8 BIT 8

7 BIT 7

6 BIT 6

5 BIT 5

4 BIT 4

3 BIT 3

2 BIT 2

1 BIT 1 (MSB)

Figure 1. ADS-946 Functional Block Diagram

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

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