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TDA4885 Datasheet(PDF) 9 Page - NXP Semiconductors

Part No. TDA4885
Description  150 MHz video controller with I2C-bus
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 9 page
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1997 Nov 25
9
Philips Semiconductors
Product speciļ¬cation
150 MHz video controller with I2C-bus
TDA4885
7.9
Gain modulation
To achieve brightness uniformity over the screen scan
dependent gain modulation is possible. With open-circuit
pins the gain will be reduced by 20% giving the possibility
of symmetrical gain modulations (
Ā±18%) with Ā±1 V related
to the open-circuit voltage of about 2.0 V at any gain
setting.
If the gain modulation feature will not be used pins GM1,
GM2 and GM3 should be grounded to profit by maximum
voltage gain.
7.10
I2C-bus control
The TDA4885 contains an I2C-bus receiver for several
control functions:
1. Contrast control with 6-bit DAC
2. Brightness control with 6-bit DAC
3. OSD contrast control with 4-bit DAC
4. Gain control for each channel with 6-bit DAC
5. Internal feedback reference and external reference
voltage control for each channel with 8-bit DAC
6. Control register with control bits FPOL, DISV, DISO
and PEDST
7. Test register for production tests only.
All registers are set to logic 0 (minimum value for control
registers) after power-up and after internal power-on reset
of the I2C-bus.




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