Texas Instruments TVP5146EVM quick start Anti-Aliasing Filters, Analog Output, Tuner Interface

SLEU063

Table 1. Analog Inputs and Pin Terminals

Input Type	TVP5160 Pin(s)
CVBS	VI_1
S-Video	VI_3(Y), VI_9(C)
YPbPr	VI_5(Y), VI_11(Pb), VI_8(Pr)
SCART	VI_3(CVBS), VI_9(R), VI_6(G), VI_12(B)
Tuner interface (CVBS)	VI_2
VBI decoder interface (analog RGB)	VI_7(R), VI_4(G), VI_10(B)

2.2Anti-Aliasing Filters

Each analog input has an anti-alias filter installed by default to ensure the input to the TVP5160 decoder is of the best quality and does not alias. The filters are elliptical in design in order to minimize the cost and still provide the best roll-off. Details on the anti-aliasing filters, including frequency response and the group delay, are provided in a separate application note.

The filter on any analog input may be bypassed by removing the 0-?resistors currently installed (JP1-6, 9, 10) and shorting one of them across 1-2. Since the S-Video input is shared with the SCART (CVBS and R), these inputs share the same anti-aliasing filters.

2.3Analog Output

The analog output from the TVP5160 decoder is made available on the TVP5160EVM. The output is buffered using a simple emitter follower and the output signal is automatically determined by the TVP5160 decoder. If a CVBS is selected as the input, then the analog output is the same looped-through CVBS output. If S-Video or YPbPr is the selected input, then only Y is output since it contains the sync information. Typically, the analog output is used for VCR record functions in some CE applications.

2.4Tuner Interface

The tuner interface provides a method of connecting an analog TV tuner to the TVP5160EVM. The expected output from the tuner module to the TVP5160EVM is baseband composite video. Termination for the 75-?input source is already provided on the TVP5160EVM tuner input. The pinout of the tuner interface is provided in Table 2.

Table 2. Tuner Interface Pinout (H2)

Description	Pin Number
CVBS output (from tuner)	10
SDA (I2C data)	29
SCL (I2C address)	31
GND	1-9, 11-28, 30, 32-36
D5V	37-40

To supply the tuner module, D5V supply and GND pins are provided. The I2C pins, SDA and SCL, are connected to the I2C communications bus on the TVP5160EVM. Control of the tuner module is available within the TVP5160EVM software as discussed later.

TVP5160EVM User’s Guide 5