®
®
ADS-951
18-Bit, 1MHz, Low-Power
Sampling A/D Converters
PRELIMINARY PRODUCT DATA
FEATURES
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18-bit resolution
1MHz minimum sampling rate
No missing codes over extended 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
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
INPUT/OUTPUT CONNECTIONS
FUNCTION
BIT 2
BIT 1 (MSB)
ANALOG GROUND
ANALOG INPUT
+5V REFERENCE OUT
GAIN ADJUST
COMPENSATION
–15V SUPPLY
+15V SUPPLY
+5V ANALOG SUPPLY
–5V ANALOG SUPPLY
ANALOG GROUND
DIGITAL GROUND
+5V DIGITAL SUPPLY
EOC
START CONVERT
PIN
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
FUNCTION
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8
BIT 9
BIT 10
BIT 11
BIT 12
BIT 13
BIT 14
BIT 15
BIT 16
BIT 17
BIT 18 (LSB)
GENERAL DESCRIPTION
The ADS-951 is an 18-bit, 1MHz 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-951 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-951 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-951 only requires the rising edge of the start convert
pulse to operate.
Requiring ±15V and ±5V supplies, the ADS-951 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 extended (–40 to +110°C)
operating temperature ranges. A proprietary, auto-calibrating,
error-correcting circuit enables the device to achieve speci-
fied performance over the full military temperature range.
2
1
BIT 1 (MSB)
BIT 2
BUFFER
ANALOG INPUT 4
32 BIT 3
–
S/H
+
FLASH
ADC
1
DIGITAL CORRECTION LOGIC
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)
GAIN ADJUST 6
GAIN
CIRCUIT
REF
+5V REFERENCE OUT 5
COMPENSATION 7
5
DAC
AMP
FLASH
ADC
2
START CONVERT 16
EOC 15
TIMING AND
CONTROL LOGIC
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
Figure 1. ADS-951 Functional Block Diagram
DATEL, Inc., Mansfield, MA 02048 (USA)
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Tel: (508) 339-3000, (800) 233-2765 Fax: (508) 339-6356
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Email: sales@datel.com
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Internet: www.datel.com
MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
