ADV7174KCPZ View Datasheet(PDF) - Analog Devices

Part Name

Description

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ADV7174KCPZ

Chip Scale PAL/NTSC Video Encoder with Advanced Power Management

Analog Devices 

ADV7174/ADV7179

SUBCARRIER FREQUENCY REGISTERS 3–0

Bits:

Address:

FSC3–FSC0

SR4–SR00 = 09H–0CH

These 8-bit-wide registers are used to set up the subcarrier frequency. The value of these registers is calculated by using the following

equation:

No.of Subcarrier Frequency Values in One Line of Video Line × 232 *

No.of 27 MHz Clock Cycles in One Video Line

* Rounded to the nearest integer.

For example, in NTSC mode,

Subcarrier Frequency Value = 227.5 × 232 = 569408542 d = 21F07 C1Eh

1716

Note that on power-up, FSC Register 0 is set to 16h. A value of 1E as derived above is recommended.

Program as

FSC Register 0: 1EH

FSC Register 2: 7CH

FSC Register 3: F0H

FSC Register 4: 21H

Figure 45 shows how the frequency is set up by the four registers.

SUBCARRIER

FREQUENCY

REG 3

SUBCARRIER

FREQUENCY

REG 2

SUBCARRIER

FREQUENCY

REG 1

SUBCARRIER

FREQUENCY

REG 0

FSC31 FSC30 FSC29 FSC28 FSC27 FSC26 FSC25 FSC24

FSC23 FSC22 FSC21 FSC20 FSC19 FSC18 FSC17 FSC16

FSC15 FSC14 FSC13 FSC12 FSC11 FSC10 FSC9 FSC8

FSC7 FSC6 FSC5 FSC4 FSC3 FSC2 FSC1 FSC0

SUBCARRIER PHASE REGISTER

Bits:

Address:

FP7–FP0

SR4–SR0 = 0DH

Figure 45. Subcarrier Frequency Register

This 8-bit-wide register is used to set up the subcarrier phase. Each bit represents 1.41°. For normal operation, this register is set to 00H.

CLOSED CAPTIONING EVEN FIELD DATA REGISTERS 1–0

Bits:

Address:

CED15–CED0

SR4–SR0 = 0EH–0FH

These 8-bit-wide registers are used to set up the closed captioning extended data bytes on even fields. Figure 46 shows how the high and

low bytes are set up in the registers.

BYTE 1 CED15 CED14 CED13 CED12 CED11 CED10 CED9 CED8

BYTE 0 CED7 CED6 CED5 CED4 CED3 CED2 CED1 CED0

Figure 46. Closed Captioning Extended Data Register

Rev. B | Page 35 of 52

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