ADS-926 查看數據表（PDF） - Unspecified
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ADS-926 Datasheet PDF : 8 Pages
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FEATURES
• 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.
ADS-926
14-Bit, 500kHz, Low-Power
Sampling A/D Converters
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
PIN FUNCTION
1
BIT 14 (LSB)
2
BIT 13
3
BIT 12
4
BIT 11
5
BIT 10
6
BIT 9
7
BIT 8
8
BIT 7
9
BIT 6
10 BIT 5
11 BIT 4
12 BIT 3
24 –12V/–15V SUPPLY
23 ANALOG GROUND
22 +12V/+15V SUPPLY
21 +10V REFERENCE OUT
20 ANALOG INPUT
19 ANALOG GROUND
18 BIT 1 (MSB)
17 BIT 2
16 START CONVERT
15 EOC
14 DIGITAL GROUND
13 +5V SUPPLY
+10V REF. OUT 21
ANALOG INPUT 20
S/H
–
+
REF
S2
FLASH
ADC
S1 BUFFER
DAC
START CONVERT 16
EOC 15
TIMING AND
CONTROL LOGIC
13
+5V SUPPLY
14
DIGITAL GROUND
22
+12V/+15V SUPPLY
19, 23
ANALOG GROUND
Figure 1. ADS-926 Functional Block Diagram
18 BIT 1 (MSB)
17 BIT 2
12 BIT 3
11 BIT 4
10 BIT 5
9 BIT 6
8 BIT 7
7 BIT 8
6 BIT 9
5 BIT 10
4 BIT 11
3 BIT 12
2 BIT 13
1 BIT 14 (LSB)
24
–12V/–15V SUPPLY
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) • Tel: (508) 339-3000 Fax: (508) 339-6356 • For immediate assistance: (800) 233-2765
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