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ADS944 Arkusz danych(PDF) 1 Page - List of Unclassifed Manufacturers

Numer części ADS944
Szczegółowy opis  14-Bit, 5MHz Sampling A/D Converters
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ADS944 Arkusz danych(HTML) 1 Page - List of Unclassifed Manufacturers

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1
+5V ANALOG SUPPLY
32
START CONVERT
2
–5.2V DIGITAL SUPPLY
31
BIT 1 (MSB)
3
ANALOG INPUT
30
BIT 1 (MSB)
4
ANALOG GROUND
29
BIT 2
5
OFFSET ADJUST
28
BIT 3
6
ANALOG GROUND
27
BIT 4
7
GAIN ADJUST
26
BIT 5
8
COMP. BITS
25
BIT 6
9
OUTPUT ENABLE
24
BIT 7
10
+5V DIGITAL SUPPLY
23
BIT 8
11
ANALOG GROUND
22
BIT 9
12
+15V SUPPLY
21
BIT 10
13
–15V SUPPLY
20
BIT 11
14
–5.2V ANALOG SUPPLY
19
BIT 12
15
DIGITAL GROUND
18
BIT 13
16
EOC
17
BIT 14 (LSB)
FEATURES
• 14-bit resolution
• 5MHz minimum sampling rate
• No missing codes over full military temperature range
• Edge-triggered, no pipeline delay
• Low power, 2.95 Watts
• Small, 32-pin, ceramic TDIP package
• SMT package available
• Excellent dynamic performance
• MIL-STD-883 screening or DESC SMD available
®
®
ADS-944
14-Bit, 5MHz
Sampling A/D Converters
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
GENERAL DESCRIPTION
The low-cost ADS-944 is a high-performance, 14-bit, 5MHz
sampling A/D converter. This device accurately samples full-
scale input signals up to Nyquist frequencies with no missing
codes. The dynamic performance of the ADS-944 has been
optimized to achieve a THD of –77dB and a SNR of 76dB.
Packaged in a small, 32-pin TDIP, the functionally complete
ADS-944 contains a fast-settling sample-hold amplifier, a
subranging (two-pass) A/D converter, an internal reference,
timing and control logic, three-state outputs, and error-
correction circuitry. Digital input and output levels are TTL.
Requiring ±15V, +5V and –5.2V supplies, the ADS-944
typically dissipates 2.95 Watts. The unit is offered with a
bipolar input range of ±1.25V. Models are available for use in
either commercial (0 to +70°C) or military (–55 to +125°C)
operating temperature ranges. Typical applications include
radar signal analysis, medical/graphic imaging, and
FFT spectrum analysis.
INPUT/OUTPUT CONNECTIONS
PIN
FUNCTION
PIN
FUNCTION
Figure 1. ADS-944 Functional Block Diagram
REF
DAC
31 BIT 1 (MSB)
30 BIT 1 (MSB)
29 BIT 2
28 BIT 3
27 BIT 4
26 BIT 5
25 BIT 6
24 BIT 7
23 BIT 8
22 BIT 9
21 BIT 10
20 BIT 11
19 BIT 12
18 BIT 13
17 BIT 14 (LSB)
TIMING AND
CONTROL LOGIC
ANALOG INPUT 3
START CONVERT 32
EOC 16
+
S/H
BUFFER
FLASH
ADC
1
FLASH
ADC
2
Σ
AMP
GAIN
CIRCUIT
GAIN ADJUST 7
OFFSET
CIRCUIT
OFFSET ADJUST 5
1
+5V
ANALOG
SUPPLY
2
–5.2V
DIGITAL
SUPPLY
4, 6, 11
ANALOG
GROUND
10
+5V
DIGITAL
SUPPLY
12
+15V
SUPPLY
14
–5.2V
ANALOG
SUPPLY
15
DIGITAL
GROUND
8
COMP.
BITS
9 OUTPUT ENABLE


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