ADCDS-1405 Datasheet, PDF (1/9 Pages) Murata Manufacturing Co., Ltd. – 14-Bit, 5 Megapixels/Second Imaging Signal Processor

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ADCDS-1405
14-Bit, 5 Megapixels/Second
Imaging Signal Processor
FEATURES
• 14-bit resolution
• 5MPPS throughput rate (14-bits)
• Functionally complete
• Very low noise
• Excellent Signal-to-Noise ratio
• Edge triggered
• Small, 40-pin, TDIP package
• Low power, 700mW typical
• Low cost
• Programmable Analog Bandwidth
GENERAL DESCRIPTION
The ADCDS-1405 is an application-specific video signal
processor designed for electronic-imaging applications that
employ CCD's (charge coupled devices) as their
photodetector. The ADCDS-1405 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-1405'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-1405 digitizes this resultant
"valid video" signal using a high-speed, low-noise sampling
A/D converter.
The ADCDS-1405 requires only the rising edge of start
convert pulse to initiate its conversion process. Additional
features of the ADCDS-1405 include gain adjust, offset
adjust, precision +2.4V reference, and a programmable
analog bandwidth function.
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
PIN FUNCTION
1
FINE GAIN ADJUST
40
2
OFFSET ADJUST
39
3
DIRECT INPUT
38
4
INVERTING INPUT
37
5
NON-INVERTING INPUT 36
6
+2.4V REF. OUTPUT
35
7
ANALOG GROUND
34
8
NO CONNECT
33
9
NO CONNECT
32
10 BIT 14 (LSB)
31
11 BIT 13
30
12 BIT 12
29
13 BIT 11
28
14 BIT 10
27
15 BIT 9
26
16 BIT 8
25
17 BIT 7
24
18 BIT 6
23
19 BIT 5
22
20 BIT 4
21
NO CONNECT
+12V
–5VA
ANALOG GROUND
+5VA
ANALOG GROUND
+5VD
DIGITAL GROUND
DIGITAL GROUND
A1
A
NO CONNECT
NO CONNECT
DATA VALID
REFERENCE HOLD
START CONVERT
OUT-OF-RANGE
BIT 1 (MSB)
BIT 2
BIT 3
759
INVERTING INPUT 4
0.01µF
DIRECT INPUT 3
NON-INVERTING INPUT 5
+12VA
39
5239
–5VA
38
+5VA
36
+5VD
34
INPUT AMPLIFIER
CORRELATED
5K 9
DOUBLE
SAMPLER
SAMPLING
A/D
OFFSET ADJUST 2
REFERENCE HOLD 26
TIMING
AND
CONTROL
25 START CONVERT
1 FINE GAIN ADJUST
23 BIT 1 (MSB)
10 BIT 14 (LSB)
24 OUT-OF-RANGE
6 +2.4V REFERENCE OUTPUT
32, 33
DIGITAL GROUND
27
DATA VALID
30 31
AØ A1
Figure 1. ADCDS-1405 Functional Block Diagram
7, 35, 37
ANALOG GROUND
DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: [phone] Fax: [phone] • Email: [e-mail] • Internet: www.datel.com