4
3
2
26
INVERTING INPUT
DIRECT INPUT
OFFSET ADJUST
REFERENCE HOLD
2732, 33 7, 35, 37
DATA VALIDDIGITAL GROUND ANALOG GROUND
25
23
10
24
6
START CONVERT
BIT 1 (MSB)
BIT 14 (LSB)
OUT-OF-RANGE
+2.4V REFERENCE OUTPUT
+12VA –5VA +5VA +5VD
39 38 36 34
TIMING
AND
CONTROL
SAMPLING
A/D
NON-INVERTING INPUT
75G57 523G57
0.01µF
5K G57
1 FINE GAIN ADJUST
5
INPUT AMPLIFIER
30 31
A1
CORRELATED
DOUBLE
SAMPLER
AØ
FEATURES
G183 14-bit resolution
G183 3MPPS throughput rate (14-bits)
G183 Functionally complete
G183 Very low noise
G183 Excellent Signal-to-Noise ratio
G183 Edge triggered
G183 Small, 40-pin, TDIP package
G183 Low power, 500mW typical
G183 Low cost
G183 Programmable Analog Bandwidth
GENERAL DESCRIPTION
The ADCDS-1403 is an application-specific video signal
processor designed for electronic-imaging applications that
employ CCD's (charge coupled devices) as their
photodetector. The ADCDS-1403 incorporates a "user
configurable" input amplifier, a CDS (correlated double
sampler) and a sampling A/D converter in a single package,
providing the user with a complete, high performance, low-
cost, low-power, integrated solution.
The key to the ADCDS-1403's performance is a unique, high-
speed, high-accuracy CDS circuit, which eliminates the
effects of residual charge, charge injection and "kT/C" noise
on the CCD's output floating capacitor, producing a "valid
video" output signal. The ADCDS-1403 digitizes this resultant
"valid video" signal using a high-speed, low-noise sampling
A/D converter.
The ADCDS-1403 requires only the rising edge of start
convert pulse to initiate its conversion process. Additional
features of the ADCDS-1403 include gain adjust, offset
adjust, precision +2.4V reference, and a programmable
analog bandwidth function.
Figure 1. ADCDS-1403 Functional Block Diagram
1 FINE GAIN ADJUST 40 NO CONNECT
2 OFFSET ADJUST 39 +12V
3 DIRECT INPUT 38 –5VA
4 INVERTING INPUT 37 ANALOG GROUND
5 NON-INVERTING INPUT 36 +5VA
6 +2.4V REF. OUTPUT 35 ANALOG GROUND
7 ANALOG GROUND 34 +5VD
8 NO CONNECT 33 DIGITAL GROUND
9 NO CONNECT 32 DIGITAL GROUND
10 BIT 14 (LSB) 31 A1
11 BIT 13 30 A
12 BIT 12 29 NO CONNECT
13 BIT 11 28 NO CONNECT
14 BIT 10 27 DATA VALID
15 BIT 9 26 REFERENCE HOLD
16 BIT 8 25 START CONVERT
17 BIT 7 24 OUT-OF-RANGE
18 BIT 6 23 BIT 1 (MSB)
19 BIT 5 22 BIT 2
20 BIT 4 21 BIT 3
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION PIN FUNCTION
®®
DATEL, Inc., Mansfield, MA 02048 (USA) G32G32G183 Tel: (508) 339-3000, (800) 233-2765 Fax: (508) 339-6356 G32G32G183G32 Email: sales@datel.com G183 Internet: www.datel.com
ADCDS-1403
14-Bit, 3 Megapixels/Second
Imaging Signal Processor