ADS-927 ETC [List of Unclassifed Manufacturers], ADS-927 Datasheet

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ADS-927

Manufacturer Part Number
ADS-927
Description
14-Bit, 1MHz, Low-Power Sampling A/D Converters
Manufacturer
ETC [List of Unclassifed Manufacturers]
Datasheet
FEATURES
GENERAL DESCRIPTION
The ADS-927 is a high-performance, 14-bit, 1MHz sampling
A/D converter. This device samples input signals up to Nyquist
frequencies with no missing codes. The ADS-927 features
outstanding dynamic performance including a THD of –80dB.
Housed in a small 24-pin DDIP or SMT (gull-wing) package,
the functionally complete ADS-927 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-927
dissipates only 1.95W (1.65W 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.
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.)
14-bit resolution
1MHz sampling rate
Functionally complete
No missing codes
Small 24-pin DDIP or SMT package
Low power, 1.9 Watts maximum
Operates from ±15V or ±12V supplies
Bipolar ±5V input range
START CONVERT 16
®
+10V REF. OUT 21
ANALOG INPUT 20
EOC 15
+5V SUPPLY
13
+
CONTROL LOGIC
TIMING AND
DIGITAL GROUND
®
S/H
Figure 1. ADS-927 Functional Block Diagram
14
S
S
2
1
+12V/+15V SUPPLY
Tel: (508) 339-3000 Fax: (508) 339-6356
BUFFER
22
PIN
10
12
11
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
14-Bit, 1MHz, Low-Power
19, 23
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-927
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)

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ADS-927 Summary of contents

Page 1

... Digital input and output levels are TTL. Requiring ±15V (or ±12V) and +5V supplies, the ADS-927 dissipates only 1.95W (1.65W 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) 335 Overvoltage Recovery Time — A/D Conversion Rate 1 PHYSICAL/ENVIRONMENTAL UNITS PARAMETERS Volts Operating Temp. Range, Case ADS-927MC, GC Volts ADS-927MM, GM, 883 Volts Thermal Impedance +0.3 Volts DD jc Volts ca °C Storage Temperature Package Type Weight +25° +70°C TYP ...

Page 3

... To avoid interaction, always adjust offset before gain. 3. When operating the ADS-927 from ±12V supplies, do not drive external circuitry with the REFERENCE OUTPUT. The reference's accuracy and drift specifications may not be met, and loading the circuit may cause accuracy errors within the converter ...

Page 4

... For the ADS-927, 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

... OUTPUT Data (N – 1) Valid DATA Notes The ADS-927 is a pulse-triggered device. Its internal operations Electrically-insulating, thermally-conductive "pads" may be installed underneath the package. Devices should be soldered to boards rather than "socketed", and of course, minimal air flow over the surface can greatly help reduce the package temperature ...

Page 6

... ADS-927 + 6 ® ® ...

Page 7

... Figure 7. ADS-927 Histogram and Differential Nonlinearity 100 150 200 250 300 Frequency (kHz) (fs = 1MHz, fin = 480kHz, Vin = –0.5dB, 16,384-point FFT) Figure 6. ADS-927 FFT Analysis +0.71 0 –0.49 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-927) Heat Sinks for all ADS-917/927 DDIP models DS-0246E ® 11/96 ...

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