FMS3110 Datasheet, PDF (4/11 Pages) Fairchild Semiconductor – Triple Video D/A Converters 3 x 10 bit, 150 Ms/s

FMS3110/3115
PRODUCT SPECIFICATION
Pin Descriptions
Pin Name Pin Number
Clock and Pixel I/O
CLK
26
R9-0
G9-0
B9-0
Controls
SYNC
47-37
48, 9–1
23–14
11
Value
TTL
TTL
TTL
TTL
TTL
Description
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.
Red Pixel Data Inputs. TTL-compatible Red Data Inputs are
registered on the rising edge of CLK.
Green Pixel Data Inputs. TTL-compatible Green Data Inputs are
registered on the rising edge of CLK.
Blue Pixel Data Inputs. TTL-compatible Blue Data Inputs are
registered on the rising edge of CLK.
Sync Pulse Input. Bringing SYNC LOW, turns off a 40 IRE (7.62 mA)
current source which forms a sync pulse on the Green D/A converter
output. SYNC is registered on the rising edge of CLK with 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.
BLANK
10
Video Outputs
IOR
33
IOG
32
IOB
29
Since this is a single-supply D/A and all signals are positive-going,
sync is added to the bottom of the Green D/A range. So turning SYNC
OFF means turning the current source ON. When a sync pulse is
desired, the current source is turned OFF. If the system does not
require sync pulses from the Green D/A converter, SYNC should be
connected to GND.
TTL Blanking Input. When BLANK is LOW, pixel inputs are ignored and
the D/A converter outputs fall to the blanking level. BLANK is
registered on the rising edge of CLK and has the same pipeline
latency as SYNC.
0.714 Vp-p
1 Vp-p
0.714 Vp-p
Red Current Output. 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.
Green Current Output. 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 the Green D/A output.
Blue Current Output. 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.
4
REV. 1.05 12/21/00