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ADS-950MC Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

Part # ADS-950MC
Description  18-Bit, 500kHz, Low-Power Sampling A/D Converters
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Manufacturer  ETC [List of Unclassifed Manufacturers]
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FEATURES
· 18-bit resolution
· 500kHz minimum sampling rate
· No missing codes over full military temperature range
· Very low power, 1.45 Watts
· Small, 32-pin, side-brazed, ceramic TDIP
· Edge-triggered
· Excellent performance
· Ideal for both time and frequency-domain applications
· Low cost
operating temperature ranges. A proprietary, auto-calibrating,
error-correcting circuit enables the device to achieve specified
performance over the full military temperature range.
PRELIMINARY PRODUCT DATA
ADS-950
18-Bit, 500kHz, Low-Power
Sampling A/D Converters
GENERAL DESCRIPTION
The low-cost ADS-950 is an 18-bit, 500kHz sampling A/D
converter. This device accurately samples full-scale input
signals up to Nyquist frequencies with no missing codes. This
feature, combined with excellent signal-to-noise ratio (SNR)
and total harmonic distortion (THD), makes the ADS-950 the
ideal choice for both time-domain (medical imaging, scanners,
process control) and frequency-domain (radar, telecommunica-
tions, spectrum analysis) applications.
Packaged in a 32-pin, side-brazed, metal-sealed, ceramic
TDIP, the functionally complete ADS-950 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, and
the ADS-950 only requires the rising edge of the start convert
pulse to operate.
Requiring ±15V and ±5V supplies, the ADS-950 typically
dissipates 1.45 Watts. The device is offered with a bipolar
(±5V) analog input range. Models are available for use in
either commercial (0 to +70°C) or military (–55 to +125°C)
INPUT/OUTPUT CONNECTIONS
Figure 1. ADS-950 Functional Block Diagram
1
BIT 2
32
BIT 3
2
BIT 1 (MSB)
31
BIT 4
3
ANALOG GROUND
30
BIT 5
4
ANALOG INPUT
29
BIT 6
5
+5V REFERENCE OUT
28
BIT 7
6
GAIN ADJUST
27
BIT 8
7
COMPENSATION
26
BIT 9
8
–15V SUPPLY
25
BIT 10
9
+15V SUPPLY
24
BIT 11
10
+5V ANALOG SUPPLY
23
BIT 12
11
–5V ANALOG SUPPLY
22
BIT 13
12
ANALOG GROUND
21
BIT 14
13
DIGITAL GROUND
20
BIT 15
14
+5V DIGITAL SUPPLY
19
BIT 16
15
EOC
18
BIT 17
16
START CONVERT
17
BIT 18 (LSB)
PIN
FUNCTION
PIN
FUNCTION
DATEL, Inc., Mansfield, MA 02048 (USA)
· Tel: (508) 339-3000, (800) 233-2765 Fax: (508) 339-6356 · Email: sales@datel.com · Internet: www.datel.com
®®
REF
DAC
2
BIT 1 (MSB)
1
BIT 2
32 BIT 3
31 BIT 4
30 BIT 5
29 BIT 6
28 BIT 7
27 BIT 8
26 BIT 9
25 BIT 10
24 BIT 11
23 BIT 12
22 BIT 13
21 BIT 14
20 BIT 15
19 BIT 16
18 BIT 17
17 BIT 18 (LSB)
TIMING AND
CONTROL LOGIC
ANALOG INPUT 4
START CONVERT 16
EOC 15
+
S/H
BUFFER
FLASH
ADC
1
FLASH
ADC
2
5
AMP
GAIN
CIRCUIT
COMPENSATION 7
+5V REFERENCE OUT 5
10
+5V ANALOG
SUPPLY
11
–5V ANALOG
SUPPLY
3, 12
ANALOG
GROUND
14
+5V DIGITAL
SUPPLY
9
+15V
SUPPLY
8
–15V
SUPPLY
13
DIGITAL
GROUND
GAIN ADJUST 6


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