ADS-942A
器件资料摘要：
® ® ADS-942A
14-Bit, 2MHz, Low-Power
Sampling A/D Converters
FEATURES
• 14-bit resolution
• 2MHz minimum throughput
• Low-power, 2.2 Watts
• Functionally complete
• Internal reference and S/H amplifier
• 78dB signal-to-noise ratio
• Full Nyquist-rate sampling
• Small 32-pin TDIP
GENERAL DESCRIPTION
DATEL's ADS-942A is a functionally complete, 14-bit, 2MHz,
sampling A/D converter. Packaged in a 32-pin TDIP, the unit
contains a fast-settling sample/hold amplifier, a 14-bit
subranging (two-pass) A/D converter, a precision reference,
three-state output register, and all the timing/control logic
necessary to operate from a single start convert pulse.
The ADS-942A is optimized for wideband frequency-domain
applications and is fully FFT tested. The ADS-942A requires
±15V and ±5V supplies and typically consumes 2.2 Watts
INPUT/OUTPUT CONNECTIONS
1 +10V REF. OUT 32 START CONVERT
2 BIPOLAR 31 BIT 1 OUT (MSB)
3 AVALOG INPUT 30 BIT 1 OUT (MSB)
4 SIGNAL GROUND 29 BIT 2 OUT
5 OFFSET ADJUST 28 BIT 3 OUT
6 ANALOG GROUND 27 BIT 4 OUT
7 OVERFLOW 26 BIT 5 OUT
8 CODING SELECT 25 BIT 6 OUT
9 ENABLE 24 BIT 7 OUT
10 +5V SUPPLY 23 BIT 8 OUT
11 DIGITAL GROUND 22 BIT 9 OUT
12 +15V SUPPLY 21 BIT 10 OUT
13 –15V SUPPLY 20 BIT 11 OUT
14 –5V SUPPLY 19 BIT 12 OUT
15 ANALOG GROUND 18 BIT 13 OUT
16 EOC 17 BIT 14 OUT (LSB)
PIN FUNCTION PIN FUNCTION
REF
RE
GI
ST
ER
RE
GI
ST
ER
31 BIT 1 OUT (MSB)
30 BIT 1 OUT (MSB)
29 BIT 2 OUT
28 BIT 3 OUT
27 BIT 4 OUT
26 BIT 5 OUT
25 BIT 6 OUT
24 BIT 7 OUT
23 BIT 8 OUT
22 BIT 9 OUT
21 BIT 10 OUT
20 BIT 11 OUT
19 BIT 12 OUT
18 BIT 13 OUT
17 BIT 14 OUT (LSB)
TIMING AND
CONTROL LOGIC
+10V REF. OUT 1
START CONVERT 32
EOC 16
DI
GI
TA
L C
OR
RE
CT
IO
N
LO
GI
C
DAC
FLASH
ADC
BUFFER
ANALOG INPUT 3
S2
S1
4
SIGNAL
GROUND
11
DIGITAL
GROUND
12
+15V
SUPPLY
3-S
TA
TE
O
UT
PU
T R
EG
IST
ER
S/H
OFFSET
CIRCUIT
BIPOLAR 2
OFFSET ADJUST 5
10
+5V
SUPPLY
6, 15
ANALOG
GROUND
8
CODING
SELECT
13
–15V
SUPPLY
9 ENABLE
7 OVERFLOW
14
–5V
SUPPLY
Figure 1. ADS-942A Functional Block Diagram
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
14-Bit, 2MHz, Low-Power
Sampling A/D Converters
FEATURES
• 14-bit resolution
• 2MHz minimum throughput
• Low-power, 2.2 Watts
• Functionally complete
• Internal reference and S/H amplifier
• 78dB signal-to-noise ratio
• Full Nyquist-rate sampling
• Small 32-pin TDIP
GENERAL DESCRIPTION
DATEL's ADS-942A is a functionally complete, 14-bit, 2MHz,
sampling A/D converter. Packaged in a 32-pin TDIP, the unit
contains a fast-settling sample/hold amplifier, a 14-bit
subranging (two-pass) A/D converter, a precision reference,
three-state output register, and all the timing/control logic
necessary to operate from a single start convert pulse.
The ADS-942A is optimized for wideband frequency-domain
applications and is fully FFT tested. The ADS-942A requires
±15V and ±5V supplies and typically consumes 2.2 Watts
INPUT/OUTPUT CONNECTIONS
1 +10V REF. OUT 32 START CONVERT
2 BIPOLAR 31 BIT 1 OUT (MSB)
3 AVALOG INPUT 30 BIT 1 OUT (MSB)
4 SIGNAL GROUND 29 BIT 2 OUT
5 OFFSET ADJUST 28 BIT 3 OUT
6 ANALOG GROUND 27 BIT 4 OUT
7 OVERFLOW 26 BIT 5 OUT
8 CODING SELECT 25 BIT 6 OUT
9 ENABLE 24 BIT 7 OUT
10 +5V SUPPLY 23 BIT 8 OUT
11 DIGITAL GROUND 22 BIT 9 OUT
12 +15V SUPPLY 21 BIT 10 OUT
13 –15V SUPPLY 20 BIT 11 OUT
14 –5V SUPPLY 19 BIT 12 OUT
15 ANALOG GROUND 18 BIT 13 OUT
16 EOC 17 BIT 14 OUT (LSB)
PIN FUNCTION PIN FUNCTION
REF
RE
GI
ST
ER
RE
GI
ST
ER
31 BIT 1 OUT (MSB)
30 BIT 1 OUT (MSB)
29 BIT 2 OUT
28 BIT 3 OUT
27 BIT 4 OUT
26 BIT 5 OUT
25 BIT 6 OUT
24 BIT 7 OUT
23 BIT 8 OUT
22 BIT 9 OUT
21 BIT 10 OUT
20 BIT 11 OUT
19 BIT 12 OUT
18 BIT 13 OUT
17 BIT 14 OUT (LSB)
TIMING AND
CONTROL LOGIC
+10V REF. OUT 1
START CONVERT 32
EOC 16
DI
GI
TA
L C
OR
RE
CT
IO
N
LO
GI
C
DAC
FLASH
ADC
BUFFER
ANALOG INPUT 3
S2
S1
4
SIGNAL
GROUND
11
DIGITAL
GROUND
12
+15V
SUPPLY
3-S
TA
TE
O
UT
PU
T R
EG
IST
ER
S/H
OFFSET
CIRCUIT
BIPOLAR 2
OFFSET ADJUST 5
10
+5V
SUPPLY
6, 15
ANALOG
GROUND
8
CODING
SELECT
13
–15V
SUPPLY
9 ENABLE
7 OVERFLOW
14
–5V
SUPPLY
Figure 1. ADS-942A Functional Block Diagram
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