ADS-943 ETC [List of Unclassifed Manufacturers], ADS-943 Datasheet

ADS-943

Manufacturer Part Number

ADS-943

Description

14-Bit, 3MHz, Low-Distortion Sampling A/D Converters

Manufacturer

ETC [List of Unclassifed Manufacturers]

Datasheet

1.ADS-943.pdf (8 pages)

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FEATURES

GENERAL DESCRIPTION

The low-cost ADS-943 is a 14-bit, 3MHz sampling A/D

converter optimized to meet the demanding dynamic-range

and sampling-rate requirements of contemporary digital

telecommunications applications. The ADS-943's outstanding

dynamic performance is evidenced by a peak harmonic

specification of –83dB and a signal-to-noise ratio (SNR) of

79dB. Additionally, the ADS-943 easily achieves the 2.2MHz

minimum sampling rate required by digital receivers in certain

ADSL, HDSL and ATM applications. The ADS-943 also

addresses size and power constraints normally associated with

these types of applications. This device requires just ±5V

supplies, dissipates 1.7 Watts, and is packaged in a very small

24-pin DDIP.

Although optimized for frequency-domain applications, the

ADS-943's DNL and noise specifications are also outstanding,

thereby making it an equally impressive device for time-domain

applications (graphic and medical imaging, process control,

etc.). In fact, the ADS-943 guarantees no missing codes to the

14-bit level over the full military operating temperature range.

The functionally complete ADS-943 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 unit is

DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.)

14-bit resolution

3MHz minimum sampling rate

Ideal for both frequency and time-domain applications

Excellent peak harmonics, –83dB

Excellent signal-to-noise ratio, 79dB

No missing codes over full military temperature range

±5V supplies, 1.7 Watts

Small, 24-pin ceramic DDIP or SMT

Low cost

+5V ANALOG SUPPLY

+5V DIGITAL SUPPLY

DIGITAL GROUND

–5V SUPPLY

ANALOG GROUND

POWER AND GROUNDING

START CONVERT 18

OFFSET ADJUST 23

ANALOG INPUT 21

EOC 17

19, 24

CONTROL LOGIC

–

S/H

TIMING AND

Figure 1. ADS-943 Functional Block Diagram

AMP

BUFFER

REF

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

FLASH

ADC

DAC

ADC

edge-triggered, requiring only the rising edge of a start convert

pulse to initiate a conversion.

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 temperature ranges. A

proprietary, auto-calibrating, error-correcting circuit allows the

device to achieve specified performance over the full military

temperature range.

FUNCTION

BIT1 (MSB)

BIT 2

BIT 3

BIT 4

BIT 5

BIT 6

BIT 7

BIT 8

BIT 9

BIT 10

BIT 11

BIT 12

14-Bit, 3MHz, Low-Distortion

INPUT/OUTPUT CONNECTIONS

Sampling A/D Converters

For immediate assistance: (800) 233-2765

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

FUNCTION

ADS-943

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)

Related parts for ADS-943

ADS-943 Summary of contents

Page 1

... ADS-943's DNL and noise specifications are also outstanding, thereby making it an equally impressive device for time-domain applications (graphic and medical imaging, process control, etc.). In fact, the ADS-943 guarantees no missing codes to the 14-bit level over the full military operating temperature range. The functionally complete ADS-943 contains a fast-settling ...

Page 2

... Slew Rate — Aperture Delay Time — Aperture Uncertainty — PHYSICAL/ENVIRONMENTAL UNITS PARAMETERS Volts Operating Temp. Range, Case ADS-943MC, GC Volts ADS-943MM, GM, 883, G/883 +0.3 Volts DD Thermal Impedance Volts jc °C ca Storage Temperature Range Package Type Weight unless otherwise specified.) +25° +70°C TYP ...

Page 3

... Bypass all power supplies to ground with 4.7µF tantalum capacitors in parallel with 0.1µF ceramic capacitors. Locate the bypass capacitors as close to the unit as possible. 2. The ADS-943 achieves its specified accuracies without the need for external calibration. If required, the device's small initial offset and gain errors can be reduced to zero using the adjustment circuitry shown in Figures 2 and 3 ...

Page 4

... Offset adjusting for the ADS-943 is normally accomplished at the point where the MSB and all other output bits are 0's and the LSB just changes from This digital output transition ideally occurs when the applied analog input is +½ ...

Page 5

... Acquisition Time 125ns typ. 125ns typ. 208ns typ. 215ns max. Hold Conversion Time 35ns typ. 120ns min., 130ns typ., 140ns max. 130ns 10ns max. Data N Valid 283ns typ. Figure 4. ADS-943 Timing Diagram 5 ADS-943 30ns typ. Invalid Data Data N+1 Valid 50ns typ. ...

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ADS-943 ETC [List of Unclassifed Manufacturers], ADS-943 Datasheet

ADS-943

Related parts for ADS-943

ADS-943 Summary of contents

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