Focus FS453, Datasheet, Page: 19 / 41

FS453/4 AND FS455/6 DATA SHEET: HARDWARE REFERENCE
Pin
Name
FBGA
Pin
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 78 549
Ω
or
1.1k
Ω
Full Scale Adjust. A resistor connected
between FS_ADJ and ground sets the current
range of the D/A converters. Use 549
Ω
for a
37.5
Ω
load (common) or 1.1k
Ω
for a 75
Ω
load.
Note that there is a 75 Ohm terminating
resistor in consumer televisions.
COMP B4 75 0.1
µ
F Compensation. A 0.1µF capacitor must be
connected between COMP and VDD_DA.
VBIAS A4 77 100
Ω
/0.1µF Voltage Bias Decoupling. An optional series
100
Ω
/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.
JANUARY, 2005, VERSION 3.0 19 COPYRIGHT
©
2003-4 FOCUS ENHANCEMENTS, INC.
FOCUS Enhancements Semiconductor