WM8148 Wolfson Microelectronics Ltd., WM8148 Datasheet - Page 36

• Manufacturer Part Number: WM8148
• Description: WM8148 : 12-BIT/12 MSPS Ccd/cis Analogue Front End/digitiser
• Manufacturer: Wolfson Microelectronics Ltd.

WM8148
Table 8 Control Register Bit Descriptions
WOLFSON MICROELECTRONICS LTD
Revision Number
Coarse Offsets
b3, b2, b1, b0
PGAFS[1:0]
DAC Values
PGA Gains
BIT/WORD
CONTROL
RLCV[3:0]
b5, ….. b0
b7, …..b0
b7, …..b0
REV[7:0]
DAC[7:0]
PGA[5:0]
RLCEXT
MUXOP
INVOP
b6, b5
b6
b7
b4
DEFAULT
Address
Address
Address
Address
000000
000110
000111
1000xy
1010xy
1011
1000
0000
00
43
0
0
1
DESCRIPTION
Changes the data output format from 12-bit parallel to 2 x 8 bit multiplexed.
MUXOP
Digitally inverts the polarity of output data.
Controls RLC DAC driving VRLC pin, to define single-ended signal-reference voltage
or reset-level clamp voltage. F(hex) is VDD, 0(hex) is 0V, B(hex) (default) is 11/15
AVDD (= 3.67V typically).
Powers down the RLC DAC, tri-stating its output, allowing VRLC to be externally driven.
RLCEXT
Configures the ADC input to accept the following video signal types:
PGAFS[1] PGAFS[0]
Read-only register, allows the user to determine the revision level of the device.
ASCII 7-bit code, e.g. 43(hex) = C
The offset-setting data for the Red, Green and Blue offset DACs. 00(hex) gives
-200mV offset referred to signal input, FF(hex) gives +200mV, 80(hex) (default) gives
approximately zero offset.
The gain setting data for the Red, Green, and Blue programmable gain amplifiers.
00(hex) gives min gain, 3F(hex) gives max gain.
INVOP
0
1
0
1
0
1
0
0
1
1
0
1
0
1
12-bit wide parallel data
8-bit wide multiplexed data
Negative-going video gives negative-going output data
Negative-going video gives positive-going output data
RLC DAC drives VRLC pin
RLC DAC Hi-Z
Bipolar video
Bipolar video
Negative-going video
Positive-going video
PD Rev 4.0 April 1999
Production Data
36