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TDA9955HL Datasheet(PDF) 10 Page - NXP Semiconductors

Part # TDA9955HL
Description  Triple 8-bit analog-to-digital video converter for HDTV
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

TDA9955HL Datasheet(HTML) 10 Page - NXP Semiconductors

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© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 17 March 2008
10 of 52
NXP Semiconductors
TDA9955HL
Triple 8-bit analog-to-digital video converter for HDTV
8.13 Video port selection
Each channel (R or G or B in RGB 4 :4:4 mode, Y or CB or CR in YUV 4 : 4 : 4 mode,
Yor CBCR in 4 : 2 : 2 semi-planar mode, CBYCRY in 4:2:2 ITU-R BT.656 mode) can be
affected to a specified video port VPA, VPB or VPC via the I2C-bus.
8.14 Output buffers
The levels of the output buffers are LV-TTL compatible. The switch of the outputs between
active and high-impedance is set by the I2C-bus.
8.15 VHREF timing generator
The VHREF timing generator outputs all the timing signals used by the device: gain and
clamp pulses for calibration, coast signal to manage the PLL, VREF, HREF and FREF
signals for SAV/EAV and other, VS and HS signals to change width and position
compared with the synchronization inputs.
8.16 I2C-bus serial interface
The I2C-bus serial interface allows to program the internal registers of the device. The
slave address of the device is selected by pin A0. The programmed values in the registers
remain valid.
8.17 Power management
Only the serial interface (and the I2C-bus registers) and the activity detection are powered
up in all cases even in the case when the device is set to power-down with the
PD-registers.
8.18 Sync timing measurement
To assist the recognition of the input format, the vertical and horizontal periods are
measured based on the externally provided MCLK frequency (13.5 MHz). The width of the
horizontal pulse is also measured.
9.
I2C-bus interface
9.1 I2C-bus protocol
The TDA9955HL is a slave I2C-bus device and the SCL pin is only an input pin. The timing
and protocol for I2C-bus are standard.
Bit A0 of the I2C-bus device address is externally selected by the A0 pin. The main device
I2C-bus address is given in Table 3.
Table 3.
I2C-bus slave address
Device address
R/W
A6
A5
A4
A3
A2
A1
A0
-
100111A0
0/1


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