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PDF ADS950 Data sheet ( Hoja de datos )
| Número de pieza | ADS950 | |
| Descripción | 18-Bit/ 500kHz/ Low-Power Sampling A/D Converters | |
| Fabricantes | ETC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADS950 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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®®
PRELIMINARY PRODUCT DATA
ADS-950
18-Bit, 500kHz, Low-Power
Sampling A/D Converters
FEATURES
· 18-bit resolution
· 500kHz minimum sampling rate
· No missing codes over full military temperature range
· Very low power, 1.45 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-950 is an 18-bit, 500kHz sampling A/D
converter. 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-950 the
ideal choice for both time-domain (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-950 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, and
the ADS-950 only requires the rising edge of the start convert
pulse to operate.
Requiring ±15V and ±5V supplies, the ADS-950 typically
dissipates 1.45 Watts. The device is offered with a bipolar
(±5V) analog input range. Models are available for use in
either commercial (0 to +70°C) or military (–55 to +125°C)
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
PIN FUNCTION
1 BIT 2
32 BIT 3
2 BIT 1 (MSB)
31 BIT 4
3 ANALOG GROUND
30 BIT 5
4 ANALOG INPUT
29 BIT 6
5 +5V REFERENCE OUT 28 BIT 7
6 GAIN ADJUST
27 BIT 8
7 COMPENSATION
26 BIT 9
8 –15V SUPPLY
25 BIT 10
9 +15V SUPPLY
24 BIT 11
10 +5V ANALOG SUPPLY 23 BIT 12
11 –5V ANALOG SUPPLY 22 BIT 13
12 ANALOG GROUND
21 BIT 14
13 DIGITAL GROUND
20 BIT 15
14 +5V DIGITAL SUPPLY 19 BIT 16
15 EOC
18 BIT 17
16 START CONVERT
17 BIT 18 (LSB)
operating temperature ranges. A proprietary, auto-calibrating,
error-correcting circuit enables the device to achieve specified
performance over the full military temperature range.
ANALOG INPUT 4
–
S/H
+
BUFFER
FLASH
ADC
1
GAIN ADJUST 6
+5V REFERENCE OUT 5
COMPENSATION 7
GAIN
CIRCUIT
REF
5
START CONVERT 16
EOC 15
AMP
TIMING AND
CONTROL LOGIC
DAC
FLASH
ADC
2
2 BIT 1 (MSB)
1 BIT 2
32 BIT 3
31 BIT 4
30 BIT 5
29 BIT 6
28 BIT 7
27 BIT 8
26 BIT 9
25 BIT 10
24 BIT 11
23 BIT 12
22 BIT 13
21 BIT 14
20 BIT 15
19 BIT 16
18 BIT 17
17 BIT 18 (LSB)
10
+5V ANALOG
SUPPLY
11
–5V ANALOG
SUPPLY
3, 12
ANALOG
GROUND
14
+5V DIGITAL
SUPPLY
9
+15V
SUPPLY
8
–15V
SUPPLY
Figure 1. ADS-950 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  
®®
ADS-950
P in 5 ( A D S - 9 5 1 )
+ 5 V D IG IT A L
10µF
15V
10µF
10µF
+15V
10k9
14
6
G A IN
A D JU S T
0 .1 µ F 1 3 D IG IT A L
GROUND
8
0 .1 µ F
0 .1 µ F
12 A N A LO G
GROUND
9
+5V A N A LO G
5V A N A LO G
+
10µF
+
10µF
0 .1 µ F
0 .1 µ F
0 .1 µ F 1 0 µ F
10
3 A N A LO G
GROUND
11
5 +5V
R E F.O U T
15
EO C
A D S -9 5 0
2 B IT 1 (M S B )
1 B IT 2
3 2 B IT 3
3 1 B IT 4
3 0 B IT 5
2 9 B IT 6
2 8 B IT 7
2 7 B IT 8
2 6 B IT 9
2 5 B IT 1 0
2 4 B IT 1 1
2 3 B IT 1 2
2 2 B IT 1 3
2 1 B IT 1 4
2 0 B IT 1 5
1 9 B IT 1 6
1 8 B IT 1 7
1 7 B IT 1 8 (L S B )
STAR T C O N VER T
C O M P E N S A T IO N
16
7
47µF
+
4
A N A L O G IN P U T
Figure 2. Typical ADS-950 Connection Diagram
STAR T
CO NVERT
N
1 0 0 0 n s ty p .
N +1
IN T E R N A L S /H
5 n s ty p .
8 1 0 n s ty p .
H o ld
A c q u is itio n T im e
6 5 n s ty p .
E O C 8 0 0 n s ty p .
C o n v e r s io n T im e
8 0 0 n s ty p .
O U TPU T
D ATA
2 0 n s ty p .
D a ta N - 2 V a lid
D a ta N - 1 V a lid
1 9 8 0 n s ty p .
20ns
N
S c a le is a p p r o x im a te ly 1 0 0 n s p e r d iv is io n .
Figure 3. ADS-950 Timing Diagram
N
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet ADS950.PDF ] | |
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