TDA9210 查看數據表（PDF） - STMicroelectronics
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TDA9210 Datasheet PDF : 19 Pages
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TDA9210
Additionally, the IC automatically works with either
positive or negative HSYNC pulses.
– When bit 0 is set to 1, BPCP is synchronized on
the leading edge of the blanking pulse BLK
(Pin 20). One can use a positive or negative
blanking pulse by programming bit 0 in
Register 9 (See I2C Table 3).
– BPCP width can be adjusted with bit 2 and 3 (see
Register 8, I2C table 2).
– If the application already provides the Back
Porch Clamping Pulse, bit 4 must be set to 1
(providing a direct connection between Pin 19
and internal BPCP).
4.2 - Synchro Clipping Function
This function is available on channel 2 (Green
Channel). When using the Sync On Green (SOG)
(Synchro pulse included in the green channel in-
Figure 1.
R8b0=0 and R8b1=0
HSYNC/BPCP (Pin19)
put) the synchro clipping function must be activat-
ed (bit 7 set to 1 in register 9) in order to keep the
right green output levels and avoid unbalanced
colours.
4.3 - Blanking Input
The Blanking pin (FBLK) is TTL compatible.
The Blanking pulse can be:
– positive or negative
– line or Composite-type (but not Frame-type).
4.4 - Contrast Adjustment (8 bits)
The contrast adjustment is made by controlling si-
multaneously the gain of the three internal amplifi-
ers through the I2C bus interface. Register 1 al-
lows the adjustment in a range of 48 dB.
Internal BPCP
R8b0=0 and R8b1=1
HSYNC/BPCP (Pin19)
Internal BPCP
R8b0=1
BLK (Pin20)
Internal BPCP
R8b4 =1
HSYNC/BPCP (Pin19)
Internal BPCP
4.5 - ABL Control
The TDA9210 includes an ABL (automatic beam
limitation) input to attenuate the RGB Video sig-
nals depending on the beam intensity.
The operating range is 2 V (from 3 V to 1 V). A typ-
ical 15 dB maximum attenuation is applied to the
output signal whatever the contrast adjustment is.
(See Figure 2 ).
When the ABL feature is not used, the ABL input
(Pin 2) must be connected to a 5 V supply voltage.
4/19
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