PDF ML6411 Data sheet ( Hoja de datos )

Número de pieza	ML6411
Descripción	Programmable Video Digitizer with Selectable Gain and Clamps
Fabricantes	Micro Linear
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No Preview Available ! September 1999 PRELIMINARY ML6411 Programmable Video Digitizer with Selectable Gain and Clamps GENERAL DESCRIPTION FEATURES The ML6411 is a Dual Video A/D converter, incorporating two input sample and holds, two high speed 8-Bit A/D converters, programmable gain control, selectable clamps, multi-phase clocking, and reference voltage generation. The ML6411 can be used to convert the following analog signals to digital signals: two composite channels or S- video channel. s Complete video digitizer for Y/C and CV video s Contains A/D’s with scalable gain, selectable clamps, and clock generation (programmable via serial bus) s Two 8-Bit +/- ½ LSB Differential Non-Linearity with 30MHz guaranteed conversion All inputs are provided with appropriate input selectable clamps to establish DC level. The clamps are full DC restore circuits with the A-to-D converters in each respective correction loop. The clamps are selectable to 16, 24, 64, and 128. The programmable gain control provides various possibilities to select and adjust the gain via two separate mechanisms: Sync-Suppressed Gain Control (SGC ) for sync suppressed video such as RGB, and User Gain Control (UGC) for video formats that require scalable gain settings. Each of these can be programmed through a serial bus. s Two Gain Control Mechanisms for programmable or sync-suppressed video gain control s Selectable Video Clamping: 16, 24, 64, 128 s Selectable Video Gain: 3dB to –6dB s Operating total power dissipation less than 425mW s Power down mode and Tri-state output control s Applications: Video Capture, Video Editing, Video Cameras, Y/C and CV analog to digital conversion s 44-pin TQFP BLOCK DIAGRAM 35 AVCC1 38 AVCC2 41 AVCC3 44 REF1 17 DVCC 15 VCCO 2 CLAMP GATE 33 DGND 32 DVCC 18 RESET 23 OEA 11 OEB 39 VINN 36 Y/CV1 42 C/CV2 CHANNEL A S/H CHANNEL B S/H GAIN PRESET SGC SYNC SUPPRESS GAIN CONTROL UGC USER GAIN CONTROL GAIN PRESET SGC SYNC SUPPRESS GAIN CONTROL UGC USER GAIN CONTROL Y OR CV1 CHANNEL A ADC LATCH Y/CV1 AOUT<7:0> 24:31 C OR CV2 CHANNEL B ADC LATCH C/CV2 BOUT<7:0> 3:10 CLAMP LEVEL SELECT CLPA<1:0> CLPB<1:0> SERIAL BUS 14 CLK TIMING GENERATOR 1 19 20 21 22 12 37 40 43 13 16 34 PD SCLK SDAT REFIN REFOUT VCC AGNDI AGND2 AGND3 GNDO DGND NC 1 1 page ELECTRICAL CHARACTERISTICS (Continued) SYMBOL PARAMETER CONDITIONS SWITCHING CHARACTERISTICS FCLK Clock input max frequency Tcph Clock input min high time Tcpl Clock input min low time Clamp Gate Width Clamp Gate Width ANALOG SIGNAL PROCESSING See Figure 2 See Figure 2 VIN magnitude 2V max VIN magnitude > 2V Y/C Gain Match CGAIN1 = CGAIN2 = 0 Chroma Crosstalk YIN = 5MHz and CIN = at DC; or YIN = at DC and CIN = 5MHz Differential Gain VIN = NTSC 40 IRE modulated ramp FCLK = 27 MHz Differential Phase VIN = NTSC 40 IRE modulated ramp FCLK = 27 MHz Signal to Noise Ratio VIN = 2V, 10MHz sinewave, FCLK = 20MHz VIN = 2V, 10MHz sinewave, FCLK = 30MHz Distortion SFDR TRANSFER FUNCTION VIN = 2V, 10MHz, FCLK = 20MHz VIN = 2V, 10MHz, FCLK = 20MHz DC integral linearity @ 27MHz DC differential linearity @ 27MHz GAIN CONTROL GRES Gain accuracy of UGC for a given gain level Input = 1VP-P or 2VP-P (See Note 2) Absolute gain error Gain accuracy for standard preset gain, GPRESET OUTPUT TIMING tds Sampling delay tho Output hold time tdo Output delay time See Figure 2 See Figure 2 See Figure 2 toe Output enable time tod Output disable time See Figure 2 See Figure 2 MIN 15 15 1.5 3.5 -30mV Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions. Note 2: Volt Peak-to-Peak = VP-P TYP 30 1.01 –60 2 1 48 45 0.3 54 ±0.8 ±0.5 5 1 8 10 12 5 5 ML6411 MAX UNITS MHz ns ns µs µs V/V dB % degree dB dB % dB LSB LSB 30mV % % % ns ns ns ns ns 5 5 Page ML6411 DUAL COMPOSITE MODE CLAMP LEVEL Channel A (CV1) 16 24 64 128 CLAMP LEVEL Channel B (CV2) 16 64 128 CLPA1 BIT 0 1 0 1 CLPB1 BIT 1 1 0 CLPA0 BIT 0 0 1 1 NOTES Typical CV Clamp. Defaults to this value on RESET CLPB0 BIT 0 1 X NOTES Typical CV clamp. Defaults to this value on RESET S-VIDEO MODE CLAMP LEVEL Channel A (Y) CLPA1 BIT CLPA0 BIT NOTES 16 0 0 Typical Y clamp. Defaults to this value on RESET 24 1 0 64 0 1 128 1 1 CLAMP LEVEL Channel B (C) Note: X = Don't Care CLPB1 BIT CLPB0 BIT NOTES 16 1 0 64 1 1 128 0 X Typical C clamp. Defaults to this value on RESET Table 3. Programmable Clamp Level Selection 11 11 Page

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