ADS-926 ETC [List of Unclassifed Manufacturers], ADS-926 Datasheet

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ADS-926

Manufacturer Part Number
ADS-926
Description
14-Bit, 500kHz, Low-Power Sampling A/D Converters
Manufacturer
ETC [List of Unclassifed Manufacturers]
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ADS-926/883
Manufacturer:
DATEL
Quantity:
62
Part Number:
ADS-926GC
Manufacturer:
DATEL
Quantity:
56
Part Number:
ADS-926GM
Manufacturer:
DATEL
Quantity:
61
Part Number:
ADS-926MC
Manufacturer:
DATEL
Quantity:
54
Part Number:
ADS-926MM
Manufacturer:
DATEL
Quantity:
68
FEATURES
GENERAL DESCRIPTION
The ADS-926 is a high-performance, 14-bit, 500kHz sampling
A/D converter. This device accurately samples full-scale input
signals up to Nyquist frequencies with no missing codes and
exhibits outstanding dynamic performance that surpasses
most 16-bit, 500kHz sampling A/D's. THD and SNR, for
example, are typically –90dB and 80dB when converting full-
scale input signals up to 100kHz.
Housed in a small 24-pin DDIP or SMT (gull-wing) package,
the functionally complete ADS-926 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-926
dissipates only 1.75W (1.6W for ±12V), maximum. 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. Contact DATEL for information on
devices screened to MIL-STD-883.
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.)
14-bit resolution
500kHz sampling rate
Functionally complete; No missing codes
Small 24-pin DDIP or SMT package
Operates from ±15V or ±12V supplies
Low power, 1.75 Watts maximum
Samples up to Nyquist frequencies
Outstanding dynamic performance
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
Figure 1. ADS-926 Functional Block Diagram
S/H
14
S
S
2
1
+12V/+15V SUPPLY
Tel: (508) 339-3000 Fax: (508) 339-6356
BUFFER
22
PIN
FLASH
10
11
12
REF
ADC
1
2
3
4
5
6
7
8
9
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
14-Bit, 500kHz, Low-Power
19, 23
Sampling A/D Converters
DAC
–12V/–15V SUPPLY
For immediate assistance: (800) 233-2765
PIN
24
23
22
21
20
19
18
17
16
15
14
13
24
–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
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
ADS-926
BIT 6
BIT 7
BIT 8
BIT 9
BIT 10
BIT 11
BIT 12
BIT 13
BIT 14 (LSB)

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ADS-926 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-926 dissipates only 1.75W (1.6W for ±12V), maximum. 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) 1335 Overvoltage Recovery Time — A/D Conversion Rate 500 PHYSICAL/ENVIRONMENTAL UNITS PARAMETERS Volts Operating Temp. Range, Case ADS-926MC, GC Volts ADS-926MM, GM, 883 Volts Thermal Impedance +0.3 Volts DD jc Volts ca °C Storage Temperature Package Type Weight +25° +70°C TYP ...

Page 3

... Locate the bypass capaci- tors 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-926 as possible. 2. The ADS-926 achieves its specified accuracies without the +25° +70°C TYP ...

Page 4

... For the ADS-926, 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

... Invalid Data = 500kHz The ADS-926 is a pulse-triggered device. Its internal operations are triggered by both the rising and falling edges of the start convert pulse. When sampling at 500kHz, the start pulse must be between 175 and 225nsec wide. For lower sampling rates, wider start pulses may be used, however, a 50nsec minimum pulse width low must be maintained ...

Page 6

... ADS-926 + 6 ® ® ...

Page 7

... DNL (LSB's) 0 Figure 7. ADS-926 Histogram and Differential Nonlinearity 50 75 100 125 150 Frequency (kHz) (fs = 500kHz, fin = 240kHz, Vin = –0.5dB, 16,384-point FFT) Figure 6. ADS-926 FFT Analysis +0.59 0 –0.57 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-926) Heat Sinks for all ADS-916/926 DDIP models. DS-0265C ® 11/96 ...

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