STV0502 Просмотр технического описания (PDF) - STMicroelectronics
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STV0502 Datasheet PDF : 15 Pages
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STV0502
FUNCTIONAL DESCRIPTION (continued)
3.3 - Control Data
Video Amplifier Gain Control (8 bits used)
Address : 0000
POR value : 0000.0000 ---> 6dB
Gain is expressed from CDSoutput to ADC input
(ADC range 1.55VPP)
- 0.07dB / LSB step
- Overall range (256 steps) : 17.7dB
Video Gain (dB)
6
6.07
6.14
...
7.12
7.19
...
23.63
23.7
Data
0000.0000
0000.0001
0000.0010
...
0001.0000
0001.0001
...
1111.1110
1111.1111
Black Level Adjustment Control (5 bits used)
Address : 0001
POR Value : 0001.0000 ---> 16LSB
The adjustment is controlling the black reference
voltage. However, it is preferred to express the
Black level adjustment in terms of the ADC output
code variation (in ADC LSBs, compared to the
nominal default setting) depending on the Black
setting.
Typically, 16 LSBs black level is recommended.
- 1 ADC LSBs / LSB step
- Overall range : 31 ADC LSBs
Black Level
(ADC Ouput Variation)
0 LSBs
1 LSBs
...
30 LSBs
31 LSBs
Data
XXX0.0000
XXX0.0001
...
XXX1.1110
XXX1.1111
Video High Gain Select (1 bit used)
Address : 0001
POR Value : 0 ---> Nominal gain
This bit controls an extra 12dB gain in the video
path (adding to gain described in previous page).
Video High Gain Select
Data
Nominal Gain
XX0X.XXXX
Extra 12dB Gain
XX1X.XXXX
Video AGCOUT Test Signal ON/OFF (2 bits used)
Address : 0001
POR Value : 00 ---> High Z pad
A pin is reserved to output the ADC input signal, or
input the ADC input signal for test and evaluation
purpose.
Those bits control the state of the output buffer. To
limit Xtalk and pollutions, the buffer is in High
impedance mode during normal operation.
VAGCOUT PIn State
Normal Operation (High Z Pin)
AGC Output Test
ADC Input Test
Data
00XX.XXXX
10XX.XXXX
11XX.XXXX
Microphone AGC Switch (1 bit used)
Address : 0010
POR value : 0000.0000 ---> AGC OFF
The switch is controlling the state of the AGC : ON
or OFF.
In OFF mode, the Micro Preamp. is set at a fixed
nominal gain of 52dB.
In ON mode, the AGC is operating in a gain range
[34dB ; 60dB] (see further in this document for
details).
Microphone AGC
OFF
ON
Data
0000.0000
0000.0001
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