PixArt Imaging Inc.
PAS109B
CMOS Image Sensor IC
2. Block Diagram
DAC 9-bit
Voltage
Reference
10- Bit
ADC
b0..b9
Imager
(164x124)
Column &
Row drive
CDS +
ReadOut
PGA
Gain code
Edge detect
Data packing
Data companding
D0..D7
Ex posure
Time
AEC/AGC
Decision
Interface
control
HSYNC
VSYNC
Timing
Control
Clock
Gen.
PXCK
CS
Control register
I2C
SCL
SDA
Block Diagram
Fig 2.1 – Block diagram of PAS109
As the block diagram of PAS109 is shown in Figure 1. By pulling the CSB pin to low, the 164x124 sensor
starts to produce a signal according to the amount of the light integrated in pixels. An entire raw data is then fed
to a CDS readout array to reduce FPN noise and reset noise. A differential signal is then read out serially and fed
to a programmable gain amplifier (PGA) followed by a 10-bit A/D converter.
Voltage reference block generates all necessary voltage and current for sensor array and analog circuit.
All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission.
3
V1.1, Mar. 2002
PixArt Imaging Inc.
E-mail:
fae_service@pixart.com.tw
PIXART [ PIXART IMAGING INC. ]
