19-3780; Rev 1; 3/09 KIT ATION EVALU E L B A AVAIL Complete Audio/Video Backend Solution The MAX4079 filters and buffers video (NTSC/PAL/DVB) and stereo audio signals from the MPEG decoder of a cable/satellite receiver, VCR/DVD player, or a TV to an external load. The MAX4079 has luma-chroma (Y-C) and composite (CVBS) video inputs with one Y-C and two CVBS outputs. All video inputs are AC-coupled with internal DC biasing on the chroma input and active clamps for the luma and composite. The MAX4079 video reconstruction filters have a 6MHz cutoff frequency and 50dB attenuation at 27MHz. The filters are matched with flat group delay for standarddefinition video. The video gain is fixed at +6dB to drive a 75Ω back-terminated load (150Ω) to unity gain. The video outputs can be either DC- or AC-coupled and are powered by a single +5V supply. The MAX4079 audio amplifiers have differential inputs for optimum performance, but can be used with singleended sources with external biasing. The audio channels have a fixed gain of +6dB and deliver 2.6VRMS output with a differential input of ±1.85V. The audio amplifiers operate from a +9V to +12V single supply and feature an internal bias generator. An on-chip mixer also provides a mono output, with +3dB gain, derived from the left and right audio channels. The MAX4079 is available in 24-pin TSSOP package, and is fully specified over the 0°C to +70°C commercial temperature range. The MAX4079 Evaluation Kit is available to help speed designs. Applications Features ♦ Integrated Video Reconstruction Filters—6MHz Lowpass Filter Supports NTSC, PAL, or DVB per ITU-601 ♦ Integrated Video and Audio Amplifiers ♦ Integrated Video Input Clamps and Biasing ♦ Mono Audio and CVBS Output to Drive External Modulator ♦ +5V (Video) and +9V to +12V (Audio) SingleSupply Operation ♦ Differential/Single-Ended Audio Inputs ♦ 24-Pin TSSOP Package Ordering Information PART TEMP RANGE MAX4079CUG+ PIN-PACKAGE 0°C to +70°C 24 TSSOP +Denotes lead(Pb)-free package. Functional Diagram VVID AUDV REXT YIN CLAMP LP FILTER +6dB YOUT CIN BIAS NETWORK LP FILTER +6dB COUT +6dB CVBSOUT1 CLAMP LP FILTER +6dB CVBSOUT2 +6dB ROUT1 +6dB ROUT2 +3dB MONO +6dB LOUT1 +6dB LOUT2 Satellite Receivers Cable Receivers Home Theater Systems DVD Players CVBSIN AV Receivers Televisions RINP RINN LINP Pin Configuration appears at end of data sheet. LINN MAX4079 GAUD CBYPASS GVID ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX4079 General Description MAX4079 Complete Audio/Video Backend Solution ABSOLUTE MAXIMUM RATINGS GVID to GAUD.......................................................-0.1V to +0.1V VVID to GVID ............................................................-0.3V to +6V AUDV to GAUD ......................................................-0.3V to +14V LINP, LINN, RINP, RINN, CBYPASS to GAUD .........-0.3V to +6V LOUT1, LOUT2, ROUT1, ROUT2, MONO to GAUD ......-0.3V to lower of (+9V and AUDV + 0.3V) YIN, CIN, CVBSIN, REXT to GVID.............-0.3V to (VVID + 0.3V) YOUT, COUT, CVBSOUT1, CVBSOUT2 to GVID.......................................................-0.3V to (VVID + 0.3V) Video Output Short-Circuit Duration to GVID or VVID ........................................................................Continuous Audio Output Short-Circuit Duration to GAUD or AUDV.......................................................................Continuous Continuous Power Dissipation (TA = +70°C) 24-Pin TSSOP (derate 12.2mW/°C above +70°C) .....975.6mW Operating Temperature Range...............................0°C to +70°C Storage Temperature Range .............................-65°C to +150°C Junction Temperature ......................................................+150°C Lead Temperature (soldering, 10s) .................................+300°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC ELECTRICAL CHARACTERISTICS (VVVID = +5V, VAUDV = +12V, VGVID = VGAUD = 0V, RLOAD_VID = 150Ω to GVID, RREXT = 10kΩ ±1%, CCBYPASS = 1µF, TA = 0°C to +70°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 12.6 V 5.0 5.25 V SUPPLIES Audio Supply Voltage Range AUDV 8.5 Video Supply Voltage Range VVID 4.75 Video Quiescent Supply Current ICCV VVID = 5.25V, no load, all video inputs AC-coupled to ground 60 100 mA Audio Quiescent Supply Current ICCA AUDV = 12.6V, no load, audio inputs biased at 2.5V 8 15 mA TSD Rising die temperature Thermal Shutdown Thermal-Shutdown Hysteresis TSD,HYS +150 °C 25 °C VIDEO Voltage Gain AV,VID VIN = 1VP-P, all video inputs, no load 5.8 Gain Matching ΔAV,VID VIN = 1VP-P, all video inputs, no load -0.4 Input Voltage Swing VIN,VID Clamp Voltage VCLMP CVBSOUT_ and YOUT, no signal, no load 1.0 Chroma Bias VBIAS COUT, no signal, no load 2.1 Droop D REXT Reference Voltage VREXT Input Resistance RIN,VID Input Clamping Current ICLMP Output Voltage Swing VOUT,VID Short-Circuit Current ISC,VID Power-Supply Rejection Ratio 2 PSRRVID 6 6.2 dB +0.4 dB YIN, CVBSIN 0 1.2 CIN 0 0.9 (Note 2) 0.85 1.00 CVBSIN or YIN 2.3 CIN 10 CVBSIN or YIN input, VIN = 3.5V 1 CVBSOUT_, YOUT 2.4 COUT 1.8 2.5 VP-P V V 2 % 1.15 V MΩ kΩ 4 µA VP-P Video output shorted to VVID or GVID 50 4.75V ≤ VVID ≤ 5.25V YOUT/COUT 48 CVBSOUT_ 48 _______________________________________________________________________________________ mA dB Complete Audio/Video Backend Solution (VVVID = +5V, VAUDV = +12V, VGVID = VGAUD = 0V, RLOAD_VID = 150Ω to GVID, RREXT = 10kΩ ±1%, CCBYPASS = 1µF, TA = 0°C to +70°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 1.414VP-P differential input 5.8 6 6.2 dB 3 3.2 dB +0.4 dB 0.3 5.2 V -1.85 +1.85 V 2 µA AUDIO Voltage Gain AV,AUD Mono Voltage Gain AV,MONO 1.414VP-P differential input, LIN = RIN 2.8 Gain Matching Between Channels ΔAV,AUD 1.414VP-P differential input -0.4 VIN,AUD Inferred from CMRR test Input Voltage Range Differential Input Voltage Range Input Current VIN,AUD DIF Inferred from output voltage swing IIN,AUD Output Voltage Swing VOUT,AUD Short-Circuit Current ISC,AUD Input overdriven, 10kΩ load to 4.15V 7.4 VP-P 15 Power-Supply Rejection Ratio PSRRAUD 8.5V ≤ AUDV ≤ 12.6V 70 Common-Mode Rejection Ratio CMRRAUD 0.3V ≤ VCM ≤ 5.2V 50 mA dB 60 dB AC ELECTRICAL CHARACTERISTICS (VVVID = +5V, VAUDV = +12V, VGVID = VGAUD = 0V, RIN_VIDEO = 75Ω to GVID, CIN_VIDEO = 0.1µF, RLOAD_VID = 150Ω to GVID, COUT_AUDIO = 10µF, RLOAD_AUD = 10kΩ ±1% to GAUD, RREXT = 10kΩ, CCBYPASS = 1µF, TA = 0°C to +70°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS VIDEO Filter Attenuation AVIDEO CVBSOUT1 = CVBSOUT2 = YOUT = COUT = 2VP-P; RL = 150Ω to ground, attenuation is referred to 100kHz f = 4MHz -0.5 f = 7MHz f = 27MHz +0.5 3 40 dB 50 Slew Rate SR VOUT = 2VP-P 30 V/µs Differential Gain DG CVBSOUT_, YOUT, COUT, 5-step modulated staircase 0.5 % Differential Phase DP CVBSOUT_, YOUT, COUT, 5-step modulated staircase 0.9 degrees YOUT/COUT 48 CVBSOUT_ 44 Power-Supply Rejection Ratio PSRRVID f = 100kHz, 0.5VP-P Peak Signal to RMS Noise SNRVID CVBSOUT_, YOUT, COUT, VIN = 1VP-P 65 dB CVBSOUT_, YOUT, COUT, fIN = 0.1MHz to 4.5MHz 25 ns f = 3.58MHz 0.5 Ω No sustained oscillations 35 pF f = 3.58MHz, 1VP-P input, between any two active inputs -63 Group Delay Deviation Output Impedance GD ZOUT,VID Capacitive Load CL,VID Video Crosstalk XTALK,VID dB dB Audio/Video Crosstalk XTALK,VD/AD f = 15kHz, 1VP-P input, between any two active audio or video inputs -76 _______________________________________________________________________________________ 3 MAX4079 DC ELECTRICAL CHARACTERISTICS (continued) AC ELECTRICAL CHARACTERISTICS (continued) (VVVID = +5V, VAUDV = +12V, VGVID = VGAUD = 0V, RIN_VIDEO = 75Ω to GVID, CIN_VIDEO = 0.1µF, RLOAD_VID = 150Ω to GVID, COUT_AUDIO = 10µF, RLOAD_AUD = 10kΩ ±1% to GAUD, RREXT = 10kΩ, CCBYPASS = 1µF, TA = 0°C to +70°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS AUDIO Gain Flatness ΔAAUD Signal-to-Noise Ratio SNRAUD Total Harmonic Distortion Plus Noise THD Output Impedance ZO,AUD Power-Supply Rejection Ratio Crosstalk Capacitive Load LOUT_, ROUT_, fIN = 20Hz to 20kHz, 0.5VRMS input 0.01 MONO, fIN = 20Hz to 20kHz, 0.5VRMS input 0.01 fIN = 1.0kHz, 0.5VRMS, CCIR weighing highpass filter at 20Hz, lowpass filter at 20kHz 85 dB fIN = 1.0kHz, 0.5VRMS 0.005 fIN = 1.0kHz, 1VRMS 0.003 f = 1kHz PSRRAUD,AC f = 1kHz, VRIPPLE = 200mVP-P dB % 0.2 Ω 60 dB XTLK,AUD f = 1kHz, 0.5VRMS input 70 dB CL,AUD No sustained oscillations 200 pF Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by design. Note 2: Droop is defined as the percentage change in the DC level from the start to the end of a video line. Inferred from input clamping current with a 0.1µF coupling capacitor. Typical Operating Characteristics (VVVID = +5V, VAUDV = +12V, VGVID = VGAUD = 0V, RIN_VIDEO = 75Ω to GVID, CIN_VIDEO = 0.1µF, RLOAD_VID = 150Ω to GVID, COUT_AUDIO = 10µF, RLOAD_AUD = 10kΩ to GAUD, RREXT = 10kΩ, CBYPASS = 1µF, TA = +25°C, unless otherwise noted.) -30 -40 VIN = 1VP-P -20 -30 -40 -10 -20 -30 -40 -50 -50 -60 -60 -60 -70 -70 -70 -80 -80 -80 1 10 FREQUENCY (MHz) 100 0.1 1 10 FREQUENCY (MHz) 100 VIN = 1VP-P 0 -50 0.1 4 -10 RESPONSE (dB) VIN = 1VP-P -20 0 RESPONSE (dB) -10 10 MAX4079 toc02 MAX4079 toc01 0 CVBSOUT_ LARGE-SIGNAL BANDWIDTH LUMA LARGE-SIGNAL BANDWIDTH 10 MAX4079 toc03 CHROMA LARGE-SIGNAL BANDWIDTH 10 RESPONSE (dB) MAX4079 Complete Audio/Video Backend Solution 0.1 1 10 FREQUENCY (MHz) _______________________________________________________________________________________ 100 Complete Audio/Video Backend Solution -60 -90 RESPONSE (dB) RESPONSE (dB) -70 -80 -90 -80 -90 -110 -110 -110 -120 -120 -120 1 10 100 0.1 1 FREQUENCY (MHz) VIDEO CROSSTALK (COUT TO YIN) VIN = 1VP-P -50 0.1 100 VIN = 1VP-P -50 -80 -90 -100 VIN = 1VP-P -50 -60 -70 -80 -90 -70 -80 -90 -100 -100 -110 -110 -110 -120 -120 -120 1 10 100 0.1 FREQUENCY (MHz) 0.1 100 80 90 80 70 50 40 DELAY (ns) 60 60 50 40 60 50 40 30 30 30 20 20 20 10 10 10 0 0 0.1 1 FREQUENCY (MHz) 10 100 100 70 DELAY (ns) 70 10 YOUT GROUP DELAY CHROMA GROUP DELAY 90 1 FREQUENCY (MHz) MAX4079 toc11 80 10 100 MAX4079 toc10 90 1 FREQUENCY (MHz) CVBSOUT_ GROUP DELAY 100 100 VIDEO CROSSTALK (YOUT TO CIN) RESPONSE (dB) -70 10 -40 -60 RESPONSE (dB) -60 0.1 1 FREQUENCY (MHz) VIDEO CROSSTALK (YOUT TO CVBSIN) -40 MAX4079 toc07 -40 10 FREQUENCY (MHz) MAX4079 toc12 0.1 RESPONSE (dB) -70 -100 -100 MAX4079 toc08 RESPONSE (dB) -80 -100 DELAY (ns) VIN = 1VP-P -50 -60 -70 MAX4079 toc06 VIN = 1VP-P -50 -60 -40 MAX4079 toc05 MAX4079 toc04 VIN = 1VP-P -50 VIDEO CROSSTALK (COUT TO CVBSIN) VIDEO CROSSTALK (CVBSOUT_ TO CIN) -40 MAX4079 toc09 VIDEO CROSSTALK (CVBSOUT_ TO YIN) -40 0 0.1 1 FREQUENCY (MHz) 10 0.1 1 10 FREQUENCY (MHz) _______________________________________________________________________________________ 5 MAX4079 Typical Operating Characteristics (continued) (VVVID = +5V, VAUDV = +12V, VGVID = VGAUD = 0V, RIN_VIDEO = 75Ω to GVID, CIN_VIDEO = 0.1µF, RLOAD_VID = 150Ω to GVID, COUT_AUDIO = 10µF, RLOAD_AUD = 10kΩ to GAUD, RREXT = 10kΩ, CBYPASS = 1µF, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VVVID = +5V, VAUDV = +12V, VGVID = VGAUD = 0V, RIN_VIDEO = 75Ω to GVID, CIN_VIDEO = 0.1µF, RLOAD_VID = 150Ω to GVID, COUT_AUDIO = 10µF, RLOAD_AUD = 10kΩ to GAUD, RREXT = 10kΩ, CBYPASS = 1µF, TA = +25°C, unless otherwise noted.) AUDIO LARGE-SIGNAL BANDWIDTH 0.1 0 -0.1 -0.2 1 2 3 4 6 5 7 DIFFERENTIAL PHASE 0.2 MAX4079 toc14 3.3 MAX4079 toc13 0.2 VIN = 0.5VRMS 3.2 RESPONSE (dB) DIFFERENTIAL PHASE (deg) DIFFERENTIAL GAIN (%) DIFFERENTIAL GAIN 3.1 MONO CHANNEL 3.0 2.9 0.1 0 2.8 -0.1 2.7 -0.2 1 2 3 4 6 5 0.01 7 0.1 1 10 100 FREQUENCY (kHz) AUDIO LARGE-SIGNAL BANDWIDTH AUDIO LARGE-SIGNAL BANDWIDTH VIN = 0.5VRMS VIN = 0.5VRMS 6.5 RESPONSE (dB) RIGHT CHANNEL 6.0 LEFT CHANNEL 6.0 5.5 5.5 5.0 5.0 0.01 0.1 1 10 0.01 100 1 10 FREQUENCY (kHz) AUDIO CROSSTALK TOTAL HARMONIC DISTORTION PLUS NOISE RATIO (LEFT CHANNEL) 0.010 MAX4079 toc17 -40 VIN = 0.5VRMS -50 0.009 0.008 -60 RIGHT TO LEFT CHANNEL 100 0.007 THD+N (%) -70 LEFT TO RIGHT CHANNEL -80 0.1 FREQUENCY (kHz) MAX4079 toc18 RESPONSE (dB) 6.5 -90 0.006 VIN = 0.5VRMS 0.005 0.004 -100 0.003 -110 0.002 VIN = 1VRMS 0.001 -120 0.01 0.1 1 FREQUENCY (kHz) 6 MAX4079 toc16 7.0 MAX4079 toc15 7.0 RESPONSE (dB) MAX4079 Complete Audio/Video Backend Solution 10 100 0.01 0.1 1 10 FREQUENCY (kHz) _______________________________________________________________________________________ 100 Complete Audio/Video Backend Solution 0.004 0.003 VIN = 1VRMS 0.002 62 61 60 59 58 57 8.5 8.0 7.5 7.0 6.5 6.0 5.5 56 0.001 55 0.1 1 100 10 5.0 0 10 FREQUENCY (kHz) 20 30 40 50 60 70 0 10 20 TEMPERATURE (°C) 30 40 50 60 70 TEMPERATURE (°C) INPUT CLAMP CURRENT vs. TEMPERATURE INPUT CLAMP CURRENT vs. INPUT VOLTAGE VIN = 3.5V 3.2 2.9 CVBSIN 2.6 YIN 2.3 10,000 INPUT CLAMP CURRENT (μA) MAX4079 toc22 3.5 SINKING 1000 2.0 YIN SOURCING 100 CVBSIN 10 1 0 10 20 30 40 50 60 70 0 INPUT VOLTAGE (V) OUTPUT BIAS VOLTAGE vs. TEMPERATURE OUTPUT BIAS VOLTAGE vs. TEMPERATURE 2.5 MAX4079 toc24 1.3 OUTPUT BIAS VOLTAGE (V) 1.2 1.1 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 TEMPERATURE (°C) YOUT 1.0 CVBSOUT 0.9 MAX4079 toc25 INPUT CLAMP CURRENT (μA) 0.01 MAX4079 toc21 63 9.0 MAX4079 toc23 0.005 64 AUDIO SUPPLY CURRENT (mA) VIN = 0.5VRMS 0.006 OUTPUT BIAS VOLTAGE (V) THD+N (%) 0.007 MAX4079 toc20 0.008 65 VIDEO SUPPLY CURRENT (mA) MAX4079 toc19 0.010 0.009 AUDIO SUPPLY CURRENT vs. TEMPERATURE VIDEO SUPPLY CURRENT vs. TEMPERATURE TOTAL HARMONIC DISTORTION PLUS NOISE RATIO (RIGHT CHANNEL) 2.3 2.1 COUT 1.9 1.7 0.8 0.7 1.5 0 10 20 30 40 50 TEMPERATURE (°C) 60 70 0 10 20 30 40 50 60 70 TEMPERATURE (°C) _______________________________________________________________________________________ 7 MAX4079 Typical Operating Characteristics (continued) (VVVID = +5V, VAUDV = +12V, VGVID = VGAUD = 0V, RIN_VIDEO = 75Ω to GVID, CIN_VIDEO = 0.1µF, RLOAD_VID = 150Ω to GVID, COUT_AUDIO = 10µF, RLOAD_AUD = 10kΩ to GAUD, RREXT = 10kΩ, CBYPASS = 1µF, TA = +25°C, unless otherwise noted.) Complete Audio/Video Backend Solution MAX4079 Pin Description PIN NAME FUNCTION 1 REXT External Filter Resistor. Bypass with a 10kΩ ±1% resistor and a 0.1µF capacitor to GVID. 2, 24 VVID Video Power-Supply Input 3 CVBSIN 4, 21 GVID 5 YIN 6 CBYPASS Composite Video Input Video Ground Luma Input Audio LDO Regulator Bypass Capacitor. Bypass with a1µF capacitor to GAUD. 7 CIN 8 AUDV Chroma Input Audio Power-Supply Input 9 LINP Left-Channel Audio Positive Input 10 LINN Left-Channel Audio Negative Input 11 RINN Right-Channel Audio Negative Input 12 RINP Right-Channel Audio Positive Input 13 ROUT2 14 ROUT1 Right-Channel Audio Output 1 15 GAUD Audio Ground 16 MONO Mono Audio Output 17 LOUT2 Left-Channel Audio Output 2 18 LOUT1 Left-Channel Audio Output 1 19 COUT Chroma Video Output 20 YOUT Luma Video Output 22 CVBSOUT1 Composite Video Output 1 23 CVBSOUT2 Composite Video Output 2 Right-Channel Audio Output 2 Detailed Description The MAX4079 filters and buffers video (NTSC/PAL/DVB) and stereo audio signals from the MPEG decoder of a cable/satellite receiver, VCR/DVD player, or a TV to an external load. The MAX4079 has luma-chroma (Y-C) and composite (CVBS) video inputs with one Y-C and two CVBS outputs. All video inputs are AC-coupled with internal DC biasing on the chroma input and active clamps for the luma and composite. The MAX4079 video reconstruction filters have a 6MHz cutoff frequency and 50dB attenuation at 27MHz. The filters are matched, with flat group delay for standarddefinition video. The video gain is fixed at +6dB to drive a 75Ω back-terminated load (150Ω) to unity gain. The video outputs can be either DC- or AC-coupled and are powered by a single +5V supply. The MAX4079 audio amplifiers have differential inputs for optimum performance, but can be used with singleended sources with external biasing. The audio channels have a fixed gain of +6dB and deliver 2.6VRMS output with a differential input of ±1.85V. The audio 8 amplifiers operate from a +9V to +12V single supply and feature an internal bias generator. An on-chip mixer also provides a mono output, with +3dB gain, derived from the left and right audio channels. Video The video section of the MAX4079 implements DC restore/biasing, amplification, and reconstruction filtering for the Y-C and CVBS input signals. All of the video inputs are AC-coupled. DC restore is performed using a sync tip clamp for both luma and composite video channels. The chroma DC level input is biased at the midlevel of the signal. All video channels have a fixed gain of +6dB. The DC level at the video outputs is controlled so that coupling capacitors are not required. All composite and luma video outputs are capable of driving 2.4VP-P, and the chroma output is capable of driving 1.8VP-P into 150Ω resistive load to ground. Up to 35pF of load capacitance can be tolerated at each video output without stability or slew-rate issues. _______________________________________________________________________________________ Complete Audio/Video Backend Solution MAX4079 +5V AOUTL+ AOUTL- LINP LEFT AUDIO CHANNEL R1 LINN R2 LINP AOUTL+ C2 C1 LINN AUDIO DAC AOUTR+ AOUTR- RINP RIGHT AUDIO CHANNEL AOUTLR1 MAX4079 R2 C2 RINN MAX4079 Figure 1. Differential Audio Inputs Figure 2. Filtering Differential Audio Inputs All video inputs are stable with up to 150Ω source resistance. For higher values, consult Maxim applications. mize the effect on the gain. The common-mode voltage for these signals is typically 2.5V. Video Reconstruction Filter The MAX4079 reconstruction filters are 4th-order Butterworth filters that provide a cutoff frequency of 6MHz and flat group delay response up to 4.5MHz. The stopband offers 26dB of attenuation at 13.5MHz and 50dB at 27MHz. Single-Ended Audio DAC The MAX4079 can also be configured for single-ended inputs. Figure 3 shows how to connect an audio DAC with single-ended outputs to the MAX4079. Figure 4 shows how reconstruction filters can be used for single-ended audio inputs. Choose these values to minimize the effect on gain. If the single-ended audio DAC does not include a common-mode voltage output, create a bias point with wellmatched resistors and couple the audio signal to the positive differential input (see Figure 5). The bias point can also be created using a resistor-divider network from the video supply voltage. Note that the tolerance of the resistors will affect the common-mode and powersupply rejection ratios. Tighter tolerances improve the performance of CMRR and PSRR, e.g., 1% resistors will not give any better than 40dB of CMRR and PSRR, whereas 0.1% resistors could improve the number to 60dB. Audio The audio section of the MAX4079 is a stereo amplifier with one differential input and two single-ended outputs for each channel (left and right). A mono output is provided by summing the two channels of the stereo signal together. The stereo channels have a +6dB typical gain, while the mono has a +3dB gain. The audio inputs can be DC-coupled, eliminating spaceconsuming coupling capacitors. Each of the five outputs can deliver 2.6VRMS into an AC-coupled 10kΩ load. Applications Information Audio DAC Interfacing Differential Audio DAC The MAX4079 accepts differential audio signals. Figure 1 shows a typical configuration for connecting the device to an audio DAC with differential outputs. Figure 2 shows the reconstruction filters that can be used for the differential audio inputs. Carefully select resistors and capacitors to attenuate out-of-band noise and mini- Power Supplies and Bypassing The MAX4079 features single +5V (video) and +12V (audio) supply operation, and requires no negative supply. Connect the VVID pins together and bypass to GVID with 0.01µF, 0.1µF, and 4.7µF capacitors in parallel. Bypass the AUDV to GAUD with 0.1µF, 1µF, and 47µF capacitors in parallel. Bypass CBYPASS to GAUD with a 1µF capacitor (see the Typical Operating Circuit). _______________________________________________________________________________________ 9 MAX4079 Complete Audio/Video Backend Solution Layout and Grounding For optimal performance, stitch ground vias between the narrow adjacent signal traces to minimize crosstalk. Avoid running video traces parallel to high-speed data lines. The MAX4079 provides separate ground connections for video and audio supplies. For best performance use separate ground planes for each of the ground returns, and connect all ground planes together at a single point. Refer to the MAX4079 Evaluation Kit for a proven circuit board layout example. +5V LEFT AUDIO CHANNEL LINP AOUTL LINN AUDIO DAC VCM R1 LINP AOUTL ~2.5V C1 RIGHT AUDIO CHANNEL RINP AOUTR RINN LINN VCM MAX4079 R1 MAX4079 Figure 3. Single-Ended Audio Inputs Figure 4. Filtering Single-Ended Audio Inputs VBIAS R R LINP AOUTL LEFT AUDIO CHANNEL INPUT LINN R R MAX4079 VBIAS OUTPUT R R RINP AOUTR RINN R 40μs/div R Figure 5. Biasing Single-Ended Audio Inputs 10 RIGHT AUDIO CHANNEL Figure 6. Vertical Sync Interval ______________________________________________________________________________________ Complete Audio/Video Backend Solution +5V VIDEO SUPPLY +12V AUDIO SUPPLY AUDV VVID 4.7μF 0.1μF 0.01μF 0.1μF VVID GVID 0.1μF 47μF 1μF GAUD *OPTIONAL CAPACITORS (TYPICAL VALUES SHOWN) GVID YIN YIN 75Ω 75Ω 330μF Z0 = 75Ω 75Ω 330μF Z0 = 75Ω 75Ω 330μF Z0 = 75Ω 75Ω 330μF YOUT MAX4079 0.1μF CIN CIN 75Ω COUT 75Ω CVBSOUT1 75Ω CVBSIN Z0 = 75Ω 75Ω CVBSOUT2 0.1μF CVBSIN 75Ω 75Ω ROUT1 10μF ROUT2 10μF RINP RINP RINN RINN LINP LINP MONO LINN LOUT1 10kΩ 10kΩ 10μF LINN 10μF 10kΩ 10μF REXT 0.1μF 10kΩ 10kΩ LOUT2 10kΩ CBYPASS 1μF ______________________________________________________________________________________ 11 MAX4079 Typical Operating Circuit Complete Audio/Video Backend Solution MAX4079 Pin Configuration Chip Information PROCESS: BiCMOS TOP VIEW + REXT 1 24 VVID VVID 2 23 CVBSOUT2 CVBSIN 3 22 CVBSOUT1 GVID 4 YIN 5 21 GVID MAX4079 CBYPASS 6 20 YOUT 19 COUT CIN 7 18 LOUT1 AUDV 8 17 LOUT2 LINP 9 16 MONO LINN 10 15 GAUD RINN 11 14 ROUT1 RINP 12 13 ROUT2 TSSOP 12 ______________________________________________________________________________________ Complete Audio/Video Backend Solution PACKAGE CODE DOCUMENT NO. 24 TSSOP U24+1 21-0066 TSSOP4.40mm.EPS PACKAGE TYPE ______________________________________________________________________________________ 13 MAX4079 Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Package Information (continued) For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. INCHES N E DIM A A1 B C e E H L H MAX MIN 0.104 0.093 0.012 0.004 0.019 0.014 0.013 0.009 0.050 0.299 0.291 0.394 0.419 0.050 0.016 SOICW.EPS MAX4079 Complete Audio/Video Backend Solution MILLIMETERS MIN 2.35 0.10 0.35 0.23 MAX 2.65 0.30 0.49 0.32 1.27 7.40 7.60 10.00 10.65 0.40 1.27 VARIATIONS: 1 INCHES TOP VIEW DIM D D D D D D A B e FRONT VIEW MIN 0.398 0.447 0.496 0.598 0.697 MAX 0.413 0.463 0.512 0.614 0.713 MILLIMETERS MIN 10.10 11.35 12.60 15.20 17.70 MAX 10.50 11.75 13.00 15.60 18.10 N MS013 16 AA 18 AB 20 AC 24 AD 28 AE C 0∞-8∞ A1 L SIDE VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, .300" SOIC APPROVAL DOCUMENT CONTROL NO. 21-0042 14 ______________________________________________________________________________________ REV. B 1 1 Complete Audio/Video Backend Solution REVISION NUMBER REVISION DATE 0 8/05 Initial release 1 3/09 Changes to remove SO package, style edits DESCRIPTION PAGES CHANGED — 1–7, 12, 13, 14 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2009 Maxim Integrated Products Heaney Maxim is a registered trademark of Maxim Integrated Products, Inc. MAX4079 Revision History