Complete, 12-Bit, 45 MHz
CCD Signal Processor
ADDI7100
FEATURES
GENERAL DESCRIPTION
Pin-compatible upgrade for the AD9945
45 MHz correlated double sampler (CDS) with variable gain
6 dB to 42 dB, 10-bit variable gain amplifier (VGA)
Low noise optical black clamp circuit
Preblanking function
12-bit, 45 MHz ADC
No missing codes guaranteed
3-wire serial digital interface
3 V single-supply operation
The ADDI7100 is a complete analog signal processor for charge-
coupled device (CCD) applications. It features a 45 MHz,
single-channel architecture designed to sample and condition
the outputs of interlaced and progressive scan area CCD arrays.
The signal chain for the ADDI7100 consists of a correlated double
sampler (CDS), a digitally controlled variable gain amplifier
(VGA), a black level clamp, and a 12-bit ADC.
The internal registers are programmed through a 3-wire serial
digital interface. Programmable features include gain adjustment,
black level adjustment, input clock polarity, and power-down
modes. The ADDI7100 operates from a single 3 V power supply,
typically dissipates 125 mW, and is packaged in a space-saving,
32-lead LFCSP.
Space-saving, 32-lead, 5 mm × 5 mm LFCSP
APPLICATIONS
Digital still cameras
Digital video camcorders
PC cameras
Portable CCD imaging devices
CCTV cameras
FUNCTIONAL BLOCK DIAGRAM
REFT REFB
PBLK
ADDI7100
DRVDD
DRVSS
BAND GAP
REFERENCE
−3dB, 0dB,
+3dB, +6dB
6dB TO 42dB
VGA
12
12-BIT
ADC
DOUT
D0 TO D11
CCDIN
CDS
CLP
10
AVDD
AVSS
CLPOB
CONTROL
REGISTERS
DVDD
DVSS
DIGITAL
INTERFACE
INTERNAL
TIMING
VD
SL
SCK
SDATA
SHP
SHD DATACLK
Figure 1.
Rev. C
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