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FMS3810/3815
Triple Video D/A Converters
3 x 8 bit, 150 Ms/s Features
• 8-bit resolution • 150 megapixels per second – 0. 2% linearity error • Sync and blank controls • 1. 0V p-p video into 37. 5Ω or 75Ω load • Internal bandgap voltage reference • Double-buffered data for low distortion • TTL-compatible inputs • Low glitch energy • Single +5 Volt power supply
Description
FMS3810/3815 products are low-cost triple D/A converters that are tailored to fit graphics and video applications where speed is critical. Two speed grades are available: FMS3810 FMS3815 100 Ms/s 150 Ms/s
Applications
• Video signal conversion – RGB – YCBCR – Composite, Y, C • Multimedia systems • Image processing • True-color graphics systems
TTL-level inputs are converted to analog current outputs that can drive 25–37. 5Ω loads corresponding to doubly-terminated 50–75Ω loads. A sync current following SYNC input timing is added to the IOG output. BLANK will override RGB inputs, setting IOG, IOB and IOR currents to zero when BLANK = L. Although appropriate for many applications the internal 1. 235V reference voltage can be overridden by the VREF input. Few external components are required, just the current reference resistor, current output load resistors, and decoupling capacitors. Package is a 48-lead LQFP. Fabrication technology is CMOS. Performance is guaranteed from 0 to 70°C.
Block Diagram
SYNC BLANK SYNC
G7-0
8
8 bit D/A Converter
IOG
B7-0
8
8 bit D/A Converter
IOB
R7-0 CLOCK
8
8 bit D/A Converter
IOR COMP RREF VREF
+1. 235V Ref
REV. 1. 08 12/21/00
FMS3810/3815
PRODUCT SPECIFICATION
Functional Description
Within the FMS3810/3815 are three identical 10-bit D/A converters, each with a current source output. External loads are required to convert the current to voltage outputs. Data inputs RGB7-0 are overridden by the BLANK input. SYNC = H activates, sync current from IOS for sync-on-green video signals.
D/A Outputs
Each D/A output is a current source. To obt...