FMS3818KRC

FMS3818KRC Datasheet

FMS3818

Part	Datasheet
FMS3818KRC	FMS3818KRC (pdf)

PDF Datasheet Preview
FMS3818 Triple Video D/A Converters 3 x 8 bit, 180 Ms/s • gain matching • LSB linearity error • Internal bandgap voltage reference • Low glitch energy • Single Volt power supply • PC Graphics • Video signal conversion RGB YCBCR Composite, Y, C The FMS3818 is a low-cost triple D/A converter, tailored to graphics and video applications where speed is critical. CMOS-level inputs are converted to analog current outputs that can drive loads corresponding to doubly-terminated 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 1.25V reference voltage can be overridden by the VREF input. Few external components are required, just the current reference resistor, current output load resistors, bypass capacitors 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 IOS 8 G7-0 8 bit D/A Converter 8 B7-0 8 bit D/A Converter 8 R7-0 CLK 8 bit D/A Converter +1.25V Ref COMP RREF VREF FMS3818 DATA SHEET Functional Description Within the FMS3818 are three identical 8-bit D/A converters, each with a current source output. External loads are required to convert these currents to voltage outputs. Data inputs RGB7-0 are overridden by the BLANK input. SYNC = H activates sync current from IOS for sync-ongreen video signals. SYNC VDDA IOS VDDA G7-0 B7-0 VDDA R7-0 VDDA Figure FMS3818 Current Source Structure Digital Inputs Incoming GBR data is registered on the rising edge of the clock input, CLK. Analog outputs follow the rising edge of CLK after a delay, tDO. SYNC and BLANK SYNC and BLANK inputs control the output level Figure 1 and Table 1 of the D/A converters during CRT retrace intervals. BLANK forces the D/A outputs to the blanking level while SYNC = L turns off a current source, IOS that is connected to the green D/A converter. SYNC = H adds a 112/256 fraction of full-scale current to the green output. SYNC = L extinguishes the sync current during the sync tip. data 700 mV max. sync 307 mV Figure Nominal Output Levels BLANK gates the D/A inputs. If BLANK = H, the D/A inputs control the output currents to be added to the output blanking level. If BLANK = L, data inputs and the pedestal are disabled. D/A Outputs Each D/A output is a current source from the VDDA supply. Expressed in current units, the GBR transformation from data to current is as follows: Ordering Information Product Number FMS3818KRC FMS3818KRC_NL Conversion Rate 180 Ms/s 180 Ms/s Lead Free Temperature Range 0°C to 70°C 0°C to 70°C Screening Commercial Package 48-Lead LQFP 48-Lead LQFP Package Marking 3818KRC NL DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 2001 Fairchild Semiconductor Corporation

PDF Datasheet Preview

FMS3818

Triple Video D/A Converters
3 x 8 bit, 180 Ms/s
• gain matching
• LSB linearity error
• Internal bandgap voltage reference
• Low glitch energy
• Single Volt power supply
• PC Graphics
• Video signal conversion

RGB YCBCR Composite, Y, C

The FMS3818 is a low-cost triple D/A converter, tailored to graphics and video applications where speed is critical.

CMOS-level inputs are converted to analog current outputs that can drive loads corresponding to doubly-terminated 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 1.25V reference voltage can be overridden by the VREF input.

Few external components are required, just the current reference resistor, current output load resistors, bypass capacitors 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 IOS
8 G7-0
8 bit D/A Converter
8 B7-0
8 bit D/A Converter
8 R7-0 CLK
8 bit D/A Converter
+1.25V Ref

COMP RREF VREF

FMS3818

DATA SHEET

Functional Description

Within the FMS3818 are three identical 8-bit D/A converters, each with a current source output. External loads are required to convert these currents to voltage outputs. Data inputs RGB7-0 are overridden by the BLANK input. SYNC = H activates sync current from IOS for sync-ongreen video signals.

SYNC

VDDA IOS

VDDA

G7-0

B7-0

VDDA

R7-0

VDDA

Figure FMS3818 Current Source Structure

Digital Inputs Incoming GBR data is registered on the rising edge of the clock input, CLK. Analog outputs follow the rising edge of CLK after a delay, tDO. SYNC and BLANK SYNC and BLANK inputs control the output level Figure 1 and Table 1 of the D/A converters during CRT retrace intervals. BLANK forces the D/A outputs to the blanking level while SYNC = L turns off a current source, IOS that is connected to the green D/A converter. SYNC = H adds a 112/256 fraction of full-scale current to the green output. SYNC = L extinguishes the sync current during the sync tip.
data 700 mV max.
sync 307 mV

Figure Nominal Output Levels

BLANK gates the D/A inputs. If BLANK = H, the D/A inputs control the output currents to be added to the output blanking level. If BLANK = L, data inputs and the pedestal are disabled.

D/A Outputs

Each D/A output is a current source from the VDDA supply. Expressed in current units, the GBR transformation from data to current is as follows:
Ordering Information

Product Number FMS3818KRC FMS3818KRC_NL

Conversion Rate
180 Ms/s 180 Ms/s

Lead Free

Temperature Range
0°C to 70°C 0°C to 70°C

Screening Commercial

Package 48-Lead LQFP 48-Lead LQFP

Package Marking 3818KRC NL

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:

Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.

A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
2001 Fairchild Semiconductor Corporation

More datasheets: 88865135 | 88865145 | 88865175 | 88865305 | 240-052 | 505-120 | S553-6500-B9-F | 3SYC | 3SYD | C705 10M008 0195

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived FMS3818KRC Datasheet file may be downloaded here without warranties.

Datasheet ID: FMS3818KRC 514918