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PDF ADS-937 Data sheet ( Hoja de datos )
| Número de pieza | ADS-937 | |
| Descripción | 16-Bit / 1MHz Low-Power Sampling A/D Converters | |
| Fabricantes | Datel | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADS-937 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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®®
ADS-937
16-Bit, 1MHz, Low-Power
Sampling A/D Converters
FEATURES
• 16-bit resolution
• 1MHz minimum sampling rate
• No missing codes over full military temperature range
• Very low power, 1.25 Watts
• Small, 32-pin, side-brazed, ceramic TDIP
• Edge-triggered
• Excellent performance
• Ideal for both time and frequency-domain applications
• Low cost
GENERAL DESCRIPTION
The low-cost ADS-937 is a 16-bit, 1MHz sampling A/D con-
verter. This device accurately samples full-scale input signals
up to Nyquist frequencies with no missing codes. This feature,
combined with excellent signal-to-noise ratio (SNR) and total
harmonic distortion (THD), makes the ADS-937 the ideal
choice for both time-domain (CCD/medical imaging, scanners,
process control) and frequency-domain (radar, telecommunica-
tions, spectrum analysis) applications.
Packaged in a 32-pin, side-brazed, metal-sealed, ceramic
TDIP, the functionally complete ADS-937 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.
ADS-937 only requires the rising edge of the start convert
pulse to operate.
Requiring ±15V and ±5V supplies, the ADS-937 typically
dissipates 1.25 Watts. The device is offered with both bipolar
(±5V) and unipolar (0 to –10V) analog input ranges. Models
are available for use in either commercial (0 to +70°C) or
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
PIN FUNCTION
1 ANALOG INPUT
32 BIT 1 (MSB)
2 ANALOG GROUND
31 BIT 2
3 UNIPOLAR
30 BIT 3
4 OFFSET ADJUST
29 BIT 4
5 +5V REFERENCE OUT 28 BIT 5
6 GAIN ADJUST
27 BIT 6
7 COMPENSATION
26 BIT 7
8 –15V SUPPLY
25 BIT 8
9 +15V SUPPLY
24 BIT 9
10 +5V ANALOG SUPPLY 23 BIT 10
11 –5V ANALOG SUPPLY 22 BIT 11
12 ANALOG GROUND
21 BIT 12
13 DIGITAL GROUND
20 BIT 13
14 +5V DIGITAL SUPPLY 19 BIT 14
15 EOC
18 BIT 15
16 START CONVERT
17 BIT 16 (LSB)
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.
UNIPOLAR 3
OFFSET ADJUST 4
ANALOG INPUT 1
–
S/H
+
BUFFER
FLASH
ADC
1
GAIN ADJUST 6
+5V REFERENCE OUT 5
COMPENSATION 7
GAIN
CIRCUIT
REF
Σ
START CONVERT 16
EOC 15
AMP
TIMING AND
CONTROL LOGIC
DAC
FLASH
ADC
2
32 BIT 1 (MSB)
31 BIT 2
30 BIT 3
29 BIT 4
28 BIT 5
27 BIT 6
26 BIT 7
25 BIT 8
24 BIT 9
23 BIT 10
22 BIT 11
21 BIT 12
20 BIT 13
19 BIT 14
18 BIT 15
17 BIT 16 (LSB)
10
+5V ANALOG
SUPPLY
11
–5V ANALOG
SUPPLY
2, 12
ANALOG
GROUND
14
+5V DIGITAL
SUPPLY
9
+15V
SUPPLY
8
–15V
SUPPLY
Figure 1. ADS-937 Functional Block Diagram
13
DIGITAL
GROUND
DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508) 339-3000, (800) 233-2765 Fax: (508) 339-6356 • Email: [email protected] • Internet: www.datel.com
1 page  
®®
Pin 5 (ADS-937)
10kΩ
6
GAIN
ADJUST
+5V DIGITAL
14
4.7µF 0.1µF 13 DIGITAL
GROUND
–15V
4.7µF
4.7µF
+15V
8
0.1µF 12 ANALOG
GROUND
0.1µF 9
+5V ANALOG
+
4.7µF
+
0.1µF
4.7µF 0.1µF
–5V ANALOG
10
2 ANALOG
GROUND
11
0.1µF 4.7µF
5 +5V
REF. OUT
20kΩ
+15V
–15V
15 4
EOC
OFFSET
ADJUST
ADS-937
32 BIT 1 (MSB)
31 BIT 2
30 BIT 3
29 BIT 4
28 BIT 5
27 BIT 6
26 BIT 7
25 BIT 8
24 BIT 9
23 BIT 10
22 BIT 11
21 BIT 12
20 BIT 13
19 BIT 14
18 BIT 15
17 BIT 16(LSB)
16
START CONVERT
COMPENSATION 7
ANALOG INPUT
UNIPOLAR
1
3
47µF
+
Figure 2. Typical ADS-937 Connection Diagram
ADS-937
START
CONVERT
N
500ns typ.
N+1
INTERNAL S/H
5ns typ.
740ns typ.
Hold
Acquisition Time
260ns typ.
EOC
65ns typ.
Conversion Time
730ns typ.
20ns typ.
Invalid Data
OUTPUT
DATA
Data N-2 Valid
Data N-1 Valid
980ns typ.
Scale is approximately 50ns per division.
Note: Scale is approximately 50ns per division. Sampling Rate = 1MHz.
20ns
Figure 3. ADS-937 Timing Diagram
N
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ADS-937.PDF ] | |
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