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PDF ADS-931 Data sheet ( Hoja de datos )
| Número de pieza | ADS-931 | |
| Descripción | A/D Converters | |
| Fabricantes | Datel | |
| Logotipo |  |
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®®
INNOVATION and EXCELLENCE
ADS-931
16-Bit, 1MHz
Sampling A/D Converters
FEATURES
• 16-bit resolution
• 1MHz sampling rate
• Functionally complete
• No missing codes over full military temperature range
• Edge-triggered
• ±5V supplies, 1.85 Watts
• Small, 40-pin, ceramic TDIP
• 87dB SNR, –89dB THD
• Ideal for both time and frequency-domain applications
GENERAL DESCRIPTION
The low-cost ADS-931 is a 16-bit, 1MHz 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-931 has been optimized to
achieve a signal-to-noise ratio (SNR) of 87dB and a total
harmonic distortion (THD) of –89dB.
Packaged in a 40-pin TDIP, the functionally complete ADS-931
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. The ADS-931 only requires the rising edge of the start
convert pulse to operate.
Requiring only ±5V supplies, the ADS-931 dissipates 1.85
Watts. The device is offered with a bipolar (±2.75V) analog
input range or a unipolar (0 to –5.5V) input range. Models are
available for use in either commercial (0 to +70°C) or military
(–55 to +125°C) operating temperature ranges. A proprietary,
auto-calibrating, error-correcting circuit enables the device to
achieve specified performance over the full military
temperature range. Typical applications include medical
imaging, radar, sonar, communications and instrumentation.
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
PIN FUNCTION
1 +3.2V REF. OUT
2 UNIPOLAR
3 ANALOG INPUT
4 ANALOG GROUND
5 OFFSET ADJUST
6 GAIN ADJUST
7 DIGITAL GROUND
8 FIFO/DIR
9 FIFO READ
10 FSTAT1
11 FSTAT2
12 START CONVERT
13 BIT 16 (LSB)
14 BIT 15
15 BIT 14
16 BIT 13
17 BIT 12
18 BIT 11
19 BIT 10
20 BIT 9
40 NO CONNECTION
39 NO CONNECTION
38 +5V ANALOG SUPPLY
37 –5V SUPPLY
36 ANALOG GROUND
35 COMP. BITS
34 OUTPUT ENABLE
33 OVERFLOW
32 EOC
31 +5V DIGITAL SUPPLY
30 DIGITAL GROUND
29 BIT 1 (MSB)
28 BIT 1 (MSB)
27 BIT 2
26 BIT 3
25 BIT 4
24 BIT 5
23 BIT 6
22 BIT 7
21 BIT 8
GAIN ADJUST 6
GAIN
ADJUST
CKT.
POWER and GROUNDING
ANALOG GROUND
4, 36
DIGITAL GROUND
7, 30
+5V DIGITAL SUPPLY 31
–5V SUPPLY
37
+5V ANALOG SUPPLY 38
NO CONNECTION 39, 40
+3.2V REF. OUT 1
OFFSET ADJUST 5
UNIPOLAR 2
ANALOG INPUT 3
OFFSET ADJUST 5
START CONVERT 12
EOC 32
COMP. BITS 35
PRECISION
+3.2V REFERENCE
OFFSET
ADJUST
CKT.
S/H
TIMING AND
CONTROL LOGIC
10 FSTAT1
11 FSTAT2
8 FIFO/DIR
9 FIFO/READ
29 BIT 1 (MSB)
28 BIT 1 (MSB)
27 BIT 2
26 BIT 3
25 BIT 4
24 BIT 5
23 BIT 6
22 BIT 7
21 BIT 8
20 BIT 9
19 BIT 10
18 BIT 11
17 BIT 12
16 BIT 13
15 BIT 14
14 BIT 15
13 BIT 16 (LSB)
34 OUTPUT ENABLE
33 OVERFLOW
Figure 1. ADS-931 Functional Block Diagram
DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508)339-3000, (800)233-2756 Fax: (508)339-6356 • E-mail:[email protected] • Internet: www.datel.com
Free Datasheet http://www.datasheet4u.com/
1 page  
®®
ADS-931
CALIBRATION PROCEDURE
Connect the converter per Figure 2. Any offset/gain calibration
procedures should not be implemented until the device is fully
warmed up. To avoid interaction, adjust offset before gain. The
ranges of adjustment for the circuits in Figure 2 are guaranteed
to compensate for the ADS-931’s initial accuracy errors and
may not be able to compensate for additional system errors.
A/D converters are calibrated by positioning their digital outputs
exactly on the transition point between two adjacent digital
output codes. This is accomplished by connecting LED's to the
digital outputs and performing adjustments until certain LED's
"flicker" equally between on and off. Other approaches employ
digital comparators or microcontrollers to detect when the
outputs change from one code to the next.
For the ADS-931, offset adjusting is normally accomplished
when the analog input is 0 minus ½ LSB (–42µV). See Table
2b for the proper bipolar output coding.
Gain adjusting is accomplished when the analog input is at
nominal full scale minus 1½ LSB's (+2.749874V).
Note: Connect pin 5 to ANALOG GROUND (pin 4) for
operation without zero/offset adjustment. Connect pin 6 to pin 4
Table 2a. Setting Output Coding Selection (Pin 35)
OUTPUT FORMAT
PIN 35 LOGIC LEVEL
Complementary Offset Binary
1
Offset Binary
0
Complementary Two’s Complement
(Using MSB, pin 29)
Two’s Complement
(Using MSB, pin 29)
Straight Binary
Complimentary Binary
1
0
1
0
for operation without gain adjustment.
Zero/Offset Adjust Procedure
1. Apply a train of pulses to the START CONVERT input (pin
12) so that the converter is continuously converting.
2. For unipolar or bipolar zero/offset adjust, apply –42µV to the
ANALOG INPUT (pin 3).
3. For bipolar inputs, adjust the offset potentiometer until the
code flickers between 1000 0000 0000 0000 and 0111
1111 1111 1111 with pin 35 tied high (complementary
offset binary) or between 0111 1111 1111 1111 and 1000
0000 0000 0000 with pin 35 tied low (offset binary).
For unipolar inputs, adjust the offset potentiometers until all
output bits are 0's and the LSB flickers between 0 and 1
with Pin 35 tied high (straight binary) or until all bits are 1's
and the LSB flickers between 0 and 1 with pin 35 tied low
(complementary binary).
4. Two's complement coding requires using BIT 1 (MSB) (pin
29). With pin 35 tied low, adjust the trimpot until the output
code flickers between all 0’s and all 1’s.
Gain Adjust Procedure
1. Apply +2.749874V to the ANALOG INPUT (pin 3).
2. For bipolar inputs, adjust the gain potentiometer until all output
bits are 0’s and the LSB flickers between a 1 and 0 with pin 35
tied high (complementary offset binary) or until all output bits
are 1’s and the LSB flickers between a 1 and 0 with pin 35 tied
low (offset binary).
3. Two's complement coding requires using BIT 1 (MSB)
(pin 29). With pin 35 tied low, adjust the gain trimpot until
the output code flickers equally between 0111 1111 1111
1111 and 0111 1111 1111 1110.
+5V
4.7µF
0.1µF
+5V
4.7µF
0.1µF
4.7µF 0.1µF
–5V
CONNECT for UNIPOLAR MODE
6.8µF
0.1µF 4.7µF
20kΩ
+5V –5V
6
GAIN
ADJUST
+5V
31 DIGITAL
DIGITAL
7, 30 GROUND
20kΩ
+5V –5V
5
OFFSET
ADJUST
38 +5V ANALOG
ANALOG
4, 36 GROUND
37 –5V
ADS-931
34 ENABLE
8 FIFO/DIR
10 FSTAT1
2 UNIPOLAR
11 FSTAT2
+3.2V
1 REF. OUT
ANALOG INPUT 3
FIFO READ 9
START CONVERT 12
COMP. BITS 35
33 OVERFLOW
32 EOC
29 BIT 1 (MSB)
28 BIT 1 (MSB)
27 BIT2
26 BIT 3
25 BIT 4
24 BIT 5
23 BIT 6
22 BIT 7
21 BIT 8
20 BIT 9
19 BIT 10
18 BIT 11
17 BIT 12
16 BIT 13
15 BIT 14
14 BIT 15
13 BIT 16 (LSB)
+5V
Figure 2. Bipolar Connection Diagram
5
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