TMC3503

PRODUCT SPECIFICATION

4

REV. 1.02 11/24/99

Pin Descriptions

Pin

Name

Pin Number

Value

Pin Function Description

LQFP

PLCC

Clock and Pixel I/O

CLK

26

27

TTL

Clock Input. The clock input is TTL-compatible and all pixel

data is registered on the rising edge of CLK. It is recommended

that CLK be driven by a dedicated TTL buffer to avoid reflection

induced jitter, overshoot, and undershoot.

47-40

9-2

23-16

6-1, 44-43

14-7

25-18

TTL

Red, Green, and Blue Pixel Inputs. The R, G, and B digital

inputs are TTL-compatible and registered on the rising edge of

CLK.

Controls

SYNC

11

16

TTL

Sync Pulse Input. Bringing SYNC LOW, turns off a 40 IRE

(7.62 mA) current source which forms a sync pulse on any D/A

rising edge of CLK along with pixel data and has the same

pipeline latency as BLANK and pixel data. SYNC does not

override any other data and should be used only during the

blanking interval. If the system does not require sync pulses,

BLANK

10

15

TTL

Blanking Input. When BLANK is LOW, pixel inputs are ignored

and the D/A converter outputs are driven to the blanking level.

BLANK is registered on the rising edge of CLK and has the

same two-pipe latency as SYNC and Data.

WHITE

—

26

TTL

Force Full Scale Input. When WHITE is HIGH, pixel inputs are

ignored and the D/A converter outputs are driven to their full-

scale output level. A BLANK input overwrites a WHITE input.

WHITE is register on the rising edge of CLK and has the same

two-pipe latency as SYNC and Data.

SLEEP

—

28

TTL

Power-down Control Input. When HIGH, SLEEP places the D/

A converter in a low-power-dissipation mode. The D/A current

sources and the digital processing are disabled. The last data

loaded into the input and D/A registers is retained. This control is

asynchronous.

Video Outputs

33

32

29

39

38

33

Red, Green, and Blue Data Outputs. The current source

outputs of the D/A converters are capable of driving RS-343A/

SMPTE-170M compatible levels into doubly-terminated 75 Ohm

lines. Sync pulses may be added to any D/A output.

32

(connected

37

SYNC Current Output. When this pin is connected to any of the

D/A converter outputs, a 40 IRE offset is added to the video

level. When the SYNC input is LOW, the current is turned off,

bring the sync tip voltage to 0.0V. If no sync pulse is required,

Voltage Reference

35

41

+1.235 V

Voltage Reference Input/Output. An internal voltage source of

+1.235 Volts is output on this pin. An external +1.235 Volt

reference may be applied here which overrides the internal

capacitor is required.