®
®
ADS-926
14-Bit, 500kHz, Low-Power
Sampling A/D Converters
FEATURES
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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
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.
INPUT/OUTPUT CONNECTIONS
PIN
1
2
3
4
5
6
7
8
9
10
11
12
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
PIN
24
23
22
21
20
19
18
17
16
15
14
13
FUNCTION
–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
DAC
18 BIT 1 (MSB)
17 BIT 2
+10V REF. OUT 21
S
2
FLASH
ADC
S/H
ANALOG INPUT 20
–
REGISTER
+
S
1
BUFFER
REGISTER
REF
DIGITAL CORRECTION LOGIC
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)
START CONVERT 16
TIMING AND
CONTROL LOGIC
EOC 15
13
+5V SUPPLY
14
DIGITAL GROUND
22
+12V/+15V SUPPLY
19, 23
ANALOG GROUND
24
–12V/–15V SUPPLY
Figure 1. ADS-926 Functional Block Diagram
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.)
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Tel: (508) 339-3000 Fax: (508) 339-6356
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For immediate assistance: (800) 233-2765
MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
