mt9v032 aptina, mt9v032 Datasheet - Page 40

• Manufacturer Part Number: mt9v032
• Description: 1/3-inch Wide-vga Cmos Digital Image Sensor
• Manufacturer: aptina

Signal Path
Figure 19:
On-Chip Biases
ADC Voltage Reference
V_Step Voltage Reference
Chip Version
Window Control
PDF: 6538045704/Source:2194051501
MT9V022_DS - Rev. C 9/10 EN
Signal Path
The MT9V032 signal path consists of a programmable gain, a programmable analog
offset, and a 10-bit ADC. See “Black Level Calibration” on page 49 for the programmable
offset operation description.
The ADC voltage reference is programmed through R0x2C, bits 2:0. The ADC reference
ranges from 1.0V to 2.1V. The default value is 1.4V. The increment size of the voltage
reference is 0.1V from 1.0V to 1.6V (R0x2C[2:0] values 0 to 6). At R0x2C[2:0] = 7, the refer-
ence voltage jumps to 2.1V.
The effect of the ADC calibration does not scale with V
tive to the output of the analog gain stage. At default, one LSB of calibration equals two
LSB in output data (1LSB
It is very important to preserve the correct values of the other bits in R0x2C. The default
register setting is 0x0004.
This voltage is used for pixel high dynamic range operations, programmable from R0x31
through R0x34.
Chip version registers R0x00 and R0xFF are read-only.
Registers R0x01 column start, R0x02 Row Start, R0x03 window height (row size), and
R0x04 window width (column size) control the size and starting coordinates of the
window.
The values programmed in the window height and width registers are the exact window
height and width out of the sensor. The window start value should never be set below
four.
Voltage (R0x48 or
Offset Correction
result of BLC)
(reset minus signal)
Pixel Output
Σ
Offset
41
C1
= 2mV, 1LSB
MT9V032: 1/3-Inch Wide-VGA Digital Image Sensor
C2
Gain Selection
result of AGC)
(R0x35 or
ADC
= 1mV).
Aptina reserves the right to change products or specifications without notice.
REF
. Instead it is a fixed value rela-
10 (12) bit ADC
©2005 Aptina Imaging Corporation. All rights reserved.
(R0x2C)
V
REF
Feature Description
ADC Data
(9:0)