ADS-929 ETC [List of Unclassifed Manufacturers], ADS-929 Datasheet

no-image

ADS-929

Manufacturer Part Number
ADS-929
Description
14-Bit, 2MHz, Low-Power Sampling A/D Converters
Manufacturer
ETC [List of Unclassifed Manufacturers]
Datasheet
FEATURES
GENERAL DESCRIPTION
The ADS-929 is a high-performance, 14-bit, 2MHz sampling
A/D converter. This device samples input signals up to Nyquist
frequencies with no missing codes. The ADS-929 features
outstanding dynamic performance including a THD of –79dB.
Housed in a small 24-pin DDIP or SMT (gull-wing) package,
the functionally complete ADS-929 contains a fast-settling
sample-hold amplifier, a subranging (two-pass) A/D converter,
a precise voltage reference, timing/control logic, and error-
correction circuitry. Digital input and output levels are TTL.
Requiring ±15V (or ±12V) and +5V supplies, the ADS-929
typically dissipates 1.7W (1.4W for ±12V). The unit is offered
with a bipolar input (–5V to +5V). Models are available for use
in either commercial (0 to +70°C) or military (–55 to +125°C)
operating temperature ranges. Applications include radar,
sonar, spectrum analysis, and graphic/medical imaging.
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.)
14-bit resolution
2MHz sampling rate
No missing codes
Functionally complete
Small 24-pin DDIP or SMT package
Low power, 1.7 Watts
Operates from ±15V or ±12V supplies
Edge-triggered; No pipeline delays
Bipolar ±5V input range
START CONVERT 16
®
ANALOG INPUT 20
+10V REF. OUT 21
EOC 15
+5V SUPPLY
13
+
CONTROL LOGIC
TIMING AND
DIGITAL GROUND
®
S/H
14
Figure 1. ADS-929 Functional Block Diagram
S
S
2
1
+12V/+15V SUPPLY
Tel: (508) 339-3000 Fax: (508) 339-6356
BUFFER
22
PIN
10
11
12
1
2
3
4
5
6
7
8
9
FLASH
REF
ADC
FUNCTION
BIT 14 (LSB)
BIT 13
BIT 12
BIT 11
BIT 10
BIT 9
BIT 8
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
ANALOG GROUND
INPUT/OUTPUT CONNECTIONS
Sampling A/D Converters
19, 23
14-Bit, 2MHz, Low-Power
DAC
For immediate assistance: (800) 233-2765
PIN
24
23
22
21
20
19
18
17
16
15
14
13
–12V/–15V SUPPLY
–12V/–15V SUPPLY
ANALOG GROUND
+12V/+15V SUPPLY
+10V REFERENCE OUT
ANALOG INPUT
ANALOG GROUND
BIT 1 (MSB)
BIT 2
START CONVERT
EOC
DIGITAL GROUND
+5V SUPPLY
FUNCTION
24
ADS-929
18 BIT 1 (MSB)
17 BIT 2
12 BIT 3
11 BIT 4
10 BIT 5
9
8
7
6
5
4
3
2
1
BIT 6
BIT 7
BIT 8
BIT 9
BIT 10
BIT 11
BIT 12
BIT 13
BIT 14 (LSB)

Related parts for ADS-929

ADS-929 Summary of contents

Page 1

... A/D converter, a precise voltage reference, timing/control logic, and error- correction circuitry. Digital input and output levels are TTL. Requiring ±15V (or ±12V) and +5V supplies, the ADS-929 typically dissipates 1.7W (1.4W for ±12V). The unit is offered with a bipolar input (–5V to +5V). Models are available for use in either commercial (0 to +70° ...

Page 2

... S/H Acquisition Time (to ±0.003%FSR, 10V step) 150 Overvoltage Recovery Time — A/D Conversion Rate 2 PHYSICAL/ENVIRONMENTAL UNITS PARAMETERS Volts Operating Temp. Range, Case ADS-929MC, GC Volts ADS-929MM, GM, 883 Volts Thermal Impedance +0.3 Volts DD jc Volts ca °C Storage Temperature Package Type Weight +25° +70°C TYP ...

Page 3

... OUTPUT (pin 21), to ground with 4.7µF tantalum capaci- tors in parallel with 0.1µF ceramic capacitors. Locate the bypass capacitors as close to the unit as possible. If the user-installed offset and gain adjusting circuit shown in Figure 2 is used, also locate it as close to the ADS-929 as possible. +25° +70°C TYP ...

Page 4

... For the ADS-929, offset adjusting 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

... Data N Valid 425ns min. = 2MHz The ADS-929 is an edge-triggered device. All internal operations are triggered by the rising edge of the start convert pulse, which may be as narrow as 20nsec. All production testing is performed at a 2MHz sampling rate with 200nsec wide start pulses. For lower sampling rates, wider start pulses may be used, however, a minimum pulse width low of 20nsec must be maintained ...

Page 6

... ADS-929 6 ® ® ...

Page 7

... Figure 7. ADS-929 Histogram and Differential Nonlinearity 200 300 400 500 600 Frequency (kHz) (fs = 2MHz, fin = 975kHz, Vin = –0.5dB, 16,384-point FFT) Figure 6. ADS-929 FFT Analysis +0.37 0 –0.37 0 16,384 Digital Output Code ...

Page 8

... Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating 0.060 TYP. 0.015 (1.524) (0.381) MAX. radius 0.130 TYP. for any pin (3.302) 0.020 0.010 TYP. (0.508) (0.254) Evaluation Board (without ADS-929) Heat Sinks for all ADS-919/929 DDIP models DS-0287B ® 11/96 ...

Related keywords