FOCUS Enhancements FS453 User Manual download pdf (Page 19)

FS453/4 AND FS455/6 DATA SHEET: HARDWARE REFERENCE

Name

FBGA

Number

PQFP Pin

Number

Type/Value Pin Function Description

Video Outputs

DAC_A A8 68 analog video Video output. As programmed by the

DAC_CNTL (9Eh) register.

DAC_B A7 70 analog video Video output. As programmed by the

DAC_CNTL (9Eh) register.

DAC_C A6 72 analog video Video output. As programmed by the

DAC_CNTL (9Eh) register.

DAC_D A9 66 analog video Video output. As programmed by the

DAC_CNTL (9Eh) register.

Voltage Reference

RSVD1 76 Reserved. Not internally connected.

FS_ADJ B3 78 549Ω or

1.1kΩ

Full Scale Adjust. A resistor connected

between FS_ADJ and ground sets the current

range of the D/A converters. Use 549Ω for a

37.5Ω load (common) or 1.1kΩ for a 75Ω load.

Note that there is a 75 Ohm terminating

resistor in consumer televisions.

COMP B4 75 0.1 µF Compensation. A 0.1µF capacitor must be

connected between COMP and VDD_DA.

VBIAS A4 77 100Ω/0.1µF Voltage Bias Decoupling. An optional series

100Ω/0.1µF capacitor can be connected

between VBIAS and VDD_DA to reduce noise

at the D/A outputs. Otherwise, leave

disconnected.

Serial Port

ALT_ADDR H13 48 TTL input

(internal pull

down)

Serial data address select. Selects the 7-bit

serial bus address:

ALT_ADDR = H: 0x6A

ALT_ADDR = L: 0x4A

SDATA K13 44 TTL I/0

(open drain)

Serial data. Data line of the serial port.

Connect to GCC serial data pin.

SCLK K12 45 TTL Input Serial clock. Clock line of the serial port.

Connect to GCC serial clock pin.

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FOCUS Enhancements FS453 User Manual Page 19

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