KIT ATION EVALU E L B A IL AVA 19-0867; Rev 0; 9/07 Standard-Definition Video Filter Amplifiers with Dual SPST Switches Features The MAX9517/MAX9524 are low-power video amplifiers with integrated reconstruction filters. Specially suited for standard-definition video signals, such as composite and luma, these devices are ideal for a wide range of applications such as cell phones and security/CCTV cameras. Video signals should be DC-coupled into the MAX9517 input and AC-coupled into the MAX9524 input. ♦ Integrated Reconstruction Filter for StandardDefinition Video The MAX9517/MAX9524 have two single-pole, singlethrow (SPST) analog switches that can be used to route stereo audio, video, or digital signals. The reconstruction filter typically has ±1dB passband flatness at 9MHz and 52dB attenuation at 27MHz. The amplifiers have a gain of 2V/V, and the outputs can be DC-coupled to a load of 75Ω, which is equivalent to two video loads. The outputs can be AC-coupled to a load of 150Ω, which is equivalent to one video load. The MAX9517/MAX9524 operate from a 2.7V to 3.6V single supply and are specified over the -40°C to +125°C automotive temperature range. The MAX9517/ MAX9524 are available in a small 12-pin TQFN (3mm x 3mm) package. ♦ Fixed Gain of 2V/V ♦ 9MHz, ±1dB Passband ♦ 52dB Attenuation at 27MHz ♦ Dual SPST Switches ♦ DC- or AC-Coupled Output ♦ 2.7V to 3.6V Single-Supply Operation Applications Security/CCTV Cameras Mobile Phones/Cell Phones Digital Still Cameras (DSC) Camcorders (DVC) Portable Media Players (PMP) Ordering Information INPUT TYPE PIN-PACKAGE PKG CODE MAX9517ATC+ DC BIAS 12 TQFN-EP* T1233+4 ABF MAX9524ATC+ AC CLAMP 12 TQFN-EP* T1233+4 ABE PART TOP MARK Note: All devices are specified over the -40°C to +125°C operating temperature range. +Denotes a lead-free package. *EP = Exposed pad. Pin Configuration appears at end of data sheet. Functional Diagrams 0 TO 50mV MAX9517 SHDN VIDIN 300mV TO 400mV AV = 2V/V VIDOUT IN1 300mV VIDIN CLAMP LPF AV = 2V/V VIDOUT IN1 COM1 IN2 NO2 MAX9524 SHDN BUFFER LPF NO1 UNKNOWN BIAS NO1 COM1 IN2 COM2 NO2 COM2 ________________________________________________________________ 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 MAX9517/MAX9524 General Description MAX9517/MAX9524 Standard-Definition Video Filter Amplifiers with Dual SPST Switches ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +4V VIDIN to GND ...........................................................-0.3V to +4V COM_, NO_ to GND ...................................-0.3V to (VDD + 0.3V) SHDN, IN_ to GND ...................................................-0.3V to +4V VIDOUT Short-Circuit Duration to VDD, GND .............Continuous Continuous Input Current VIDIN, IN_, SHDN ..........................................................±20mA COM_, NO_ .................................................................±100mA Peak Current COM_, NO_ (pulsed at 1ms, 10% duty cycle) ............±200mA Continuous Power Dissipation (TA = +70°C) 12-Pin TQFN (derate 14.7mW/°C above +70°C) ........1177mW Operating Temperature Range .........................-40°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +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. ELECTRICAL CHARACTERISTICS (VDD = SHDN = 3.3V, GND = 0V, no load, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL Supply Voltage Range Supply Current Shutdown Supply Current VDD IDD ISHDN CONDITIONS Guaranteed by PSRR MIN TYP 2.7 MAX UNITS 3.6 V MAX9517 3.5 7 MAX9524 4.25 8 VSHDN = GND 1 mA µA VIDEO DC BUFFER INPUTS (MAX9517) VIN Guaranteed by outputvoltage swing Input Current IIN VIN = 0V Input Resistance RIN Input Voltage Range DC Voltage Gain AV Output Level Output-Voltage Swing VDD = 2.7V 0 1.05 VDD = 3V 0 1.2 3.5 10 300 RL = 150Ω to GND VDD = 2.7V, 0 ≤ VIN ≤ 1.05V VDD = 3V, 0 ≤ VIN ≤ 1.2V Measured at VOUT, VIDIN = 0.1µF to GND, RL = 150Ω to GND V µA kΩ 1.95 2.00 2.04 1.95 2.00 2.04 200 300 410 V/V Measured at output, VDD = 2.7V, 0 ≤ VIN ≤ 1.05V, RL = 150Ω to -0.2V 2.1 Measured at output, VDD = 2.7V, 0 ≤ VIN ≤ 1.05V, RL = 150Ω to VDD/2 2.1 Measured at output, VDD = 3V, 0 ≤ VIN ≤ 1.2V, RL = 150Ω to -0.2V 2.4 Measured at output, VDD = 3V, 0 ≤ VIN ≤ 1.2V, RL = 150Ω to VDD/2 2.4 Measured at output, VDD = 3.135V, 0 ≤ VIN ≤ 1.05V, RL = 75Ω to -0.2V 2.1 mV VP-P SYNC-TIP CLAMP INPUT (MAX9524) Sync-Tip Clamp Level Input Voltage Range Sync Crush 2 VCLP Sync-tip clamp 0.23 0.39 VDD = 2.7V to 3.6V 1.05 VDD = 3V to 3.6V 1.2 Sync-tip clamp, percentage reduction in sync pulse (0.3VP-P), guaranteed by input clamping current measurement _______________________________________________________________________________________ 2 V VP-P % Standard-Definition Video Filter Amplifiers with Dual SPST Switches (VDD = SHDN = 3.3V, GND = 0V, no load, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL Input Clamping Current CONDITIONS MIN Sync-tip clamp Maximum Input Source Resistance DC Voltage Gain (Note 2) MAX UNITS 1 2 µA Ω 300 AV RL = 150Ω to GND VDD = 2.7V, 0 ≤ VIN ≤ 1.05V 1.95 2.00 2.04 VDD = 3V, 0 ≤ VIN ≤ 1.2V 1.95 2.00 2.04 0.21 0.30 0.39 Measured at VOUT, VIDIN = 0.1µF to GND, RL = 150Ω to GND Output Level Output-Voltage Swing Output Short-Circuit Current Output Resistance Output Leakage Current TYP ROUT Measured at output, VDD = 2.7V, VIN = VCLP to (VCLP +1.05V), RL = 150Ω to -0.2V 2.1 Measured at output, VDD = 2.7V, VIN = VCLP to (VCLP +1.05V), RL = 150Ω to VDD/2 2.1 Measured at output, VDD = 3V, VIN = VCLP to (VCLP +1.2V), RL = 150Ω to -0.2V 2.4 Measured at output, VDD = 3V, VIN = VCLP to (VCLP +1.2V), RL = 150Ω to VDD/2 2.4 Measured at output, VDD = 3.135V, VIN = VCLP to (VCLP +1.05V), RL = 75Ω to -0.2V 2.1 Short to GND (sourcing) 140 Short to VCC (sinking) 70 VOUT = 1.5V, -10mA ≤ ILOAD ≤ +10mA SHDN = GND 0.2 2.7V ≤ VDD ≤ 3.6V Power-Supply Rejection Ratio mA Ω µA dB 9 f = 5.5MHz VVIDOUT = 2VP-P, reference frequency is 100kHz V VP-P 1 48 ±1dB passband flatness Standard-Definition Reconstruction Filter V/V MHz +0.15 f = 10MHz -3 f = 27MHz -52 dB Differential Gain DG 5-step modulated staircase of 129mV step size and 286mVP-P subcarrier amplitude; f = 4.43MHz 1 % Differential Phase DP 5-step modulated staircase of 129mV step size and 286mVP-P subcarrier amplitude; f = 4.43MHz 0.4 Degrees Bar time is 18µs, the beginning 2.5% and the ending 2.5% of the bar time are ignored, 2T = 200ns 0.6 K% 2T Pulse Response 2T = 200ns 0.2 K% 2T Bar Response Bar time is 18µs, the beginning 2.5% and the ending 2.5% of the bar time are ignored, 2T = 200ns 0.2 K% 2T Pulse-to-Bar K Rating _______________________________________________________________________________________ 3 MAX9517/MAX9524 ELECTRICAL CHARACTERISTICS (continued) MAX9517/MAX9524 Standard-Definition Video Filter Amplifiers with Dual SPST Switches ELECTRICAL CHARACTERISTICS (continued) (VDD = SHDN = 3.3V, GND = 0V, no load, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Nonlinearity 5-step staircase, f = 4.43MHz 0.5 % Group Delay Distortion 100kHz ≤ f ≤ 5.5MHz, outputs are 2VP-P 12 ns Peak Signal to RMS Noise 100kHz ≤ f ≤ 5.5MHz 71 dB Power-Supply Rejection Ratio f = 1MHz, 100mVP-P 29 dB Output Impedance f = 5.5MHz 4.8 Ω All-Hostile Crosstalk f = 4.43MHz -64 dB ANALOG SWITCHES Analog Signal Range On-Resistance (Note 3) VCOM_, VNO_ 0 RON VDD = 2.7V, ICOM_ = 10mA, VNO_ = 1.5V ΔRON VDD = 2.7V, ICOM_ = 10mA, VNO_ = 1.5V On-Resistance Flatness (Note 5) RFLAT(ON) VDD = 2.7V, ICOM_ = 10mA, VNO_ = 1.0V, 1.5V, 2.0V NO_ Off-Leakage Current (Note 3) INO_(OFF) VDD = 3.6V, VCOM_ = 0.3V, 3.3V; VNO_ = 3.3V, 0.3V COM_ On-Leakage Current (Note 3) ICOM_(ON) VDD = 3.6V, VCOM_ = 0.3V, 3.3V; VNO_ = 0.3V, 3.3V, or unconnected On-Resistance Match Between Channels (Notes 3, 4) VDD V 5.0 Ω 0.4 Ω 1.5 Ω -2 +2 nA -2.5 +2.5 nA 1.7 0.5 Turn-On Time tON VNO_ = 1.5V; RL = 300Ω, CL = 35pF, VIH = 1.5V, VIL = 0V 100 ns Turn-Off Time tOFF VNO_ = 1.5V; RL = 300Ω, CL = 35pF, VIH = 1.5V, VIL = 0V 100 ns Skew (Note 3) tSKEW Charge Injection Off-Isolation RS = 39Ω, CL = 50pF 2 Q VGEN = 1.5V, RGEN = 0Ω, CL = 1nF 10 VISO f = 10MHz; VNO_ = 1VP-P; RL = 50Ω, CL = 5pF -55 f = 1MHz; VNO_ = 1VP-P; RL = 50Ω, CL = 5pF -80 ns pC dB On-Channel -3dB Bandwidth BW Signal = 0dBm, RL = 50Ω, CL = 5pF 300 Total Harmonic Distortion THD VCOM_ = 2VP-P, RL = 600Ω 0.03 % NO_ Off-Capacitance Switch On-Capacitance Switch-to-Switch NO_-to-VIDOUT 4 MHz CNO_(OFF) f = 1MHz 20 pF C(ON) f = 1MHz 50 pF f = 10MHz; VNO_ = 1VP-P, RL = 50Ω, CL = 5pF -80 f = 1MHz; VNO_ = 1VP-P, RL = 50Ω, CL = 5pF -110 VCT Video circuit is on, switches are open dB f = 10MHz; VNO_ = 1VP-P -55 f = 1MHz; VNO_ = 1VP-P -80 dB _______________________________________________________________________________________ Standard-Definition Video Filter Amplifiers with Dual SPST Switches (VDD = SHDN = 3.3V, GND = 0V, no load, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS CROSSTALK VIDOUT-to-NO_ Video circuit is on, f = 20kHz, VIDOUT = 2VP-P, RL = 50Ω, CL = 5pF 90 dB VIDIN-to-COM Video circuit is shutdown, f = 20kHz, 0.25VP-P at VIDIN, RL = 600Ω 100 dB VIDOUT-to-COM Video circuit is on, f = 20kHz, VIDOUT = 2VP-P, RL = 50Ω, CL = 5pF 90 dB LOGIC SIGNAL (IN1 AND IN2) Logic-Low Threshold VIL Logic-High Threshold VIH 0.5 Logic-Input Current IIN 10 µA Logic-Low Threshold VIL 0.3 x VDD V Logic-High Threshold VIH Logic-Input Current IIN 1.4 V V LOGIC SIGNAL (SHDN) Note 1: Note 2: Note 3: Note 4: Note 5: 0.7 x VDD V 10 µA All devices are 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by design. Voltage gain (AV) is a two-point measurement in which the output-voltage swing is divided by the input-voltage swing. Guaranteed by design. ΔRON = RON(MAX) - RON(MIN). Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal ranges. Typical Operating Characteristics (VDD = SHDN = 3.3V. Video outputs have RL = 150Ω connected to GND. TA = +25°C, unless otherwise noted.) SMALL-SIGNAL GAIN vs. FREQUENCY -10 0 0 -10 -30 -40 -50 -1.0 GAIN (dB) GAIN (dB) GAIN (dB) 10 -0.5 -20 -1.5 -2.0 -20 -30 -40 -2.5 -60 -70 VOUT = 100mVP-P 0.5 MAX9517/24 toc03 0 MAX9517/24 toc02 1.0 MAX9517/24 toc01 10 LARGE-SIGNAL GAIN vs. FREQUENCY SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY -50 -3.0 -60 -3.5 VOUT = 100mVP-P -80 VOUT = 2VP-P -70 -4.0 100k 1M 10M FREQUENCY (Hz) 100M 1M 10M FREQUENCY (Hz) 100M 100k 1M 10M 100M FREQUENCY (Hz) _______________________________________________________________________________________ 5 MAX9517/MAX9524 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (VDD = SHDN = 3.3V. Video outputs have RL = 150Ω connected to GND. TA = +25°C, unless otherwise noted.) VOUT = 2VP-P 100 -1.0 -1.5 -2.0 -2.5 -10 -20 80 PSRR (dB) GROUP DELAY (ns) -0.5 0 MAX9517/24 toc05 VOUT = 2VP-P 0 60 -40 -50 40 -60 -3.0 20 -70 -3.5 -4.0 -80 0 1M 100M 10M 100k 1M 10M 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz) QUIESCENT SUPPLY CURRENT vs. TEMPERATURE VOLTAGE GAIN vs. TEMPERATURE OUTPUT VOLTAGE vs. INPUT VOLTAGE (MAX9517) 2.02 VOLTAGE GAIN (V/V) 5.5 2.03 5.0 4.5 4.0 3.5 3.0 OUTPUT VOLTAGE (V) 6.0 3.5 MAX9517/24 toc08 2.04 MAX9517/24 toc07 6.5 2.01 2.00 1.99 1.98 2.5 2.0 1.5 1.0 0.5 3.0 1.97 2.5 1.96 0 2.0 1.95 -0.5 -50 100k 10k 100M FREQUENCY (Hz) 7.0 -25 0 25 50 75 100 125 -50 TEMPERATURE (°C) DIFFERENTIAL PHASE (deg) 0.8 0.6 0.4 0.2 0 -0.2 -0.4 0 25 50 75 100 125 -0.3 0 0.3 0.6 0.9 1.2 1.5 INPUT VOLTAGE (V) 2T RESPONSE MAX9517/24 toc11 MAX9517/24 toc10 DIFFERENTIAL GAIN (%) 0.1 0 -0.1 -0.2 -0.3 -0.4 -25 TEMPERATURE (°C) DIFFERENTIAL GAIN AND PHASE 6 -30 MAX9517/24 toc09 GAIN FLATNESS (dB) 120 MAX9517/24 toc04 1.0 0.5 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY GROUP DELAY vs. FREQUENCY MAX9517/24 toc06 LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY QUIESCENT SUPPLY CURRENT (mA) MAX9517/MAX9524 Standard-Definition Video Filter Amplifiers with Dual SPST Switches VIDIN 200mV/div f = 4.43MHz 1 2 3 4 5 6 7 VIDOUT 400mV/div f = 4.43MHz 1 2 3 4 5 6 7 100ns/div _______________________________________________________________________________________ 1.8 Standard-Definition Video Filter Amplifiers with Dual SPST Switches (VDD = SHDN = 3.3V. Video outputs have RL = 150Ω connected to GND. TA = +25°C, unless otherwise noted.) NTC-7 VIDEO TEST SIGNAL 12.5T RESPONSE PAL MULTIBURST RESPONSE MAX9517/24 toc13 MAX9517/24 toc12 MAX9517/24 toc14 VIDIN 500mV/div VIDIN 200mV/div VIDIN 500mV/div VIDOUT 1V/div VIDOUT 400mV/div VIDOUT 1V/div 400ns/div 10μs/div 10μs/div PAL COLOR BARS FIELD SQUARE-WAVE RESPONSE SWITCH INPUT-TO-INPUT CROSSTALK vs. FREQUENCY MAX9517/24 toc16 0 MAX9517/24 toc17 MAX9517/24 toc15 -20 VIDOUT 1V/div VIDOUT 1V/div -40 GAIN (dB) VIDIN 500mV/div VIDIN 500mV/div -60 -80 -100 -120 2ms/div 10μs/div 100k 1M 10M 100M FREQUENCY (Hz) SWITCH OUTPUT-TO-OUTPUT CROSSTALK vs. FREQUENCY GAIN (dB) -40 -60 -80 MAX9517/24 toc19 -20 100 OUTPUT IMPEDANCE (Ω) MAX9517/24 toc18 0 OUTPUT IMPEDANCE vs. FREQUENCY 10 1 0.1 -100 -120 0.01 100k 1M 10M FREQUENCY (Hz) 100M 100k 1M 10M FREQUENCY (Hz) _______________________________________________________________________________________ 7 MAX9517/MAX9524 Typical Operating Characteristics (continued) MAX9517/MAX9524 Standard-Definition Video Filter Amplifiers with Dual SPST Switches Typical Operating Characteristics (continued) (VDD = SHDN = 3.3V. Video outputs have RL = 150Ω connected to GND. TA = +25°C, unless otherwise noted.) MAX9517 ENABLE RESPONSE MAX9524 ENABLE RESPONSE MAX9517/24 toc20 MAX9517/24 toc21 VIN = 0.1μF TO GND VIN = 1V SHDN 1V/div SHDN 1V/div OUTPUT 1V/div OUTPUT 250mV/div 4ms/div 4ms/div MAX9517 DISABLE RESPONSE MAX9524 DISABLE RESPONSE MAX9517/24 toc22 MAX9517/24 toc23 VIN = 1V VIN = 0.1μF TO GND SHDN 1V/div SHDN 1V/div OUTPUT 1V/div OUTPUT 250mV/div 10ns/div 10ns/div Pin Description 8 PIN NAME 1 N.C. 2 COM1 FUNCTION No Connection. Not internally connected. Analog Switch 1 Common Terminal 3 COM2 4 VIDOUT Analog Switch 2 Common Terminal 5 GND Ground 6 VIDIN Video Input 7 NO2 Analog Switch 2 Normally Open Terminal 8 NO1 Analog Switch 1 Normally Open Terminal Video Output 9 SHDN 10 IN1 Analog Switch 1 Digital Control Input 11 IN2 Analog Switch 2 Digital Control Input 12 VDD — EP Active-Low Shutdown Input. Connect to GND to place device in shutdown. Positive Power Supply. Bypass to GND with a 0.1µF capacitor. Exposed Paddle. Connect EP to GND. EP is also internally connected to GND. _______________________________________________________________________________________ Standard-Definition Video Filter Amplifiers with Dual SPST Switches The MAX9517/MAX9524 consist of a lowpass filter and an output amplifier capable of driving a standard 150Ω video load to ground. The MAX9517 has an input buffer and the MAX9524 has an input sync-tip clamp. The MAX9517/MAX9524 both have two SPST analog switches that can be used to route audio, video, or digital signals. The output amplifiers provide a fixed gain of 2V/V. The MAX9517/MAX9524 filter and amplify the video DAC output. External video signals, in which the DC bias is usually not known, can be AC-coupled to the MAX9524. Input with DC Buffer (MAX9517) The input of the MAX9517 can be directly connected to the video source if the signal is approximately between ground and 1V. This specification is commonly found at the output of most video DACs. DC-coupling requires that the input signals are ground referenced so that the sync tip of composite or luma signals is within 50mV of ground. Input with Sync-Tip Clamp (MAX9524) When the bias of the incoming video signal is either unknown or not between ground and 1V (such as an external video source), use the MAX9524 to connect the video source through a 0.1µF capacitor. The VIDIN input of the MAX9524 can only handle signals with a sync pulse, such as composite video and luma. An internal sync-tip clamp sets the internal DC level of the video signal. Video Filter The filter passband (±1dB) is typically 9MHz to make the device suitable for standard-definition video signals from all sources (including broadcast video and DVD). Broadcast video signals are channel limited: NTSC signals have 4.2MHz bandwidth, and PAL signals have 5MHz bandwidth. Video signals from a DVD player, however, are not channel limited; therefore, the bandwidth of DVD video signals can approach the Nyquist limit of 6.75MHz (recommendation ITU-R BT.601-5 specifies 13.5MHz as the sampling rate for standarddefinition video). Therefore, the maximum bandwidth of the signal is 6.75MHz. To ease the filtering requirements, most modern video systems oversample by two times, clocking the video current DAC at 27MHz. Outputs The video output amplifiers can both source and sink load current, allowing output loads to be DC- or ACcoupled. The amplifier output stage needs around 300mV of headroom from either supply rail. The parts have an internal level shift circuit that positions the sync tip at approximately 300mV at the output. If the supply voltage is greater than 3.135V (5% below a 3.3V supply), each amplifier can drive two DC-coupled video loads to ground. If the supply is less than 3.135V, each amplifier can drive only one DC-coupled or AC-coupled video load. Shutdown The MAX9517/MAX9524 draw less than 1µA supply current when SHDN is low. In shutdown, the amplifier output becomes high impedance. SPST Analog Switches Table 1. Logic for Analog Switches IN_ SWITCH STATE 0 OFF 1 ON Applications Information Reducing Power Consumption in the Video DACs The MAX9517/MAX9524 have high-impedance input buffers that can work with source resistances as high as 300Ω. To reduce power dissipation in the video DACs, the DAC output resistor can be scaled up in value. The reference resistor that sets the reference current inside the video DACs must also be similarly scaled up. For instance, if the output resistor is 37.5Ω, the DAC must source 26.7mA when the output is 1V. If the output resistor is increased to 300Ω, the DAC only needs to source 3.33mA when the output is 1V. There is parasitic capacitance from the DAC output to ground. That capacitance in parallel with the DAC output resistor forms a pole that can potentially roll off the frequency response of the video signal. For example, 300Ω in parallel with 50pF creates a pole at 10.6MHz. To minimize this capacitance, reduce the area of the signal trace attached to the DAC output as much as possible, and place the MAX9517/MAX9524 as close as possible to the video DAC outputs. _______________________________________________________________________________________ 9 MAX9517/MAX9524 Detailed Description MAX9517/MAX9524 Standard-Definition Video Filter Amplifiers with Dual SPST Switches AC-Coupling the Outputs The outputs can be AC-coupled because the output stage can source and sink current as shown in Figure 1. Coupling capacitors should be 220µF or greater to keep the highpass filter formed by the 150Ω equivalent resistance of the video transmission line to a corner frequency of 4.8Hz or below. The frame rate of PAL systems is 25Hz, and the frame rate of NTSC systems is 30Hz. The corner frequency should be well below the frame rate. Changing Between Video Output and Microphone Input on a Single Connector A single pole on a mobile phone jack can be used for transmitting a video signal to a television or receiving the signal from the microphone of a headset. Figure 2 shows how the MAX9517 can transmit a video signal. Figure 3 shows how the MAX9517 can receive and pass on the signal from a microphone. Switching Between Video and Digital Signals The dual SPST analog switches and the high-impedance output of the video amplifier enable video transmission, digital transmission, and digital reception all on a single pole of a connector. Figures 4, 5, and 6 show the different configurations of the MAX9517. Selecting Between Two Video Sources The analog switches can multiplex between two video sources. For example, a mobile phone might have an application processor with an integrated video encoder and a mobile graphics processor with an integrated video encoder, each creating a composite video signal that is between 0 and 1V. Figure 7 shows this application in which the MAX9517 chooses between two internal video sources. The two analog switches can be used as a 2:1 multiplexer to select which video DAC output is actually filtered, amplified, and then driven out to the connector. Close switch 1 to select the video from the application processor. Close switch 2 to select the video from the mobile graphics processor. Figure 8 shows the application in which the MAX9524 chooses between two external video sources with unknown DC bias. Y/C Mixer with Chroma Mute If the video application processor has two current output digital-to-analog converters (DACs) for luma (Y) and chroma (C), respectively, then the signals can be mixed together to create a composite video signal by summing the currents into a single resistor, as shown in Figure 9. The composite video signal should be ACcoupled into the MAX9524 because the composite video signal has a positive DC level shift. The sync-tip clamp of the MAX9524 will re-establish the DC bias level of the signal inside the chip. The chroma current is connected to essentially a single-pole, double-throw (SPDT) switch. In one position, the switch routes the chroma current into the resistor. In the other position, the switch routes the chroma current into ground. For the Y/C mixer to work properly, the chroma current must be routed through analog switch 1 into the resistor. If the chroma signal needs to be muted, then the chroma current is shunted to ground through analog switch 2. Analog switch 1 stays open. See Figure 10. VDD APPLICATION PROCESSOR MAX9517 SHDN +3.3V 0.1μF GND +3.3V BUFFER DAC CVBS VIDIN LPF AV = 2V/V VIDOUT 75Ω 220μF IN1 NO1 COM1 MICROCONTROLLER IN2 NO2 COM2 Figure 1. AC-Coupled Outputs 10 ______________________________________________________________________________________ CVBS Standard-Definition Video Filter Amplifiers with Dual SPST Switches MAX9517 SHDN +3.3V 0.1μF GND +3.3V MAX9517/MAX9524 VDD APPLICATION PROCESSOR BUFFER DAC CVBS VIDIN LPF AV = 2V/V VIDOUT 75Ω TO JACK VCC VCC BASEBAND IC IN1 MIC BIAS NO1 OFF IN2 COM1 COM2 NO2 MIC AMP OFF Figure 2. Video Output Configuration VDD APPLICATION PROCESSOR OFF DAC MAX9517 SHDN +3.3V 0.1μF GND BUFFER CVBS VIDIN OFF VCC VCC BASEBAND IC IN1 MIC BIAS NO1 LPF AV = 2V/V OFF OFF VIDOUT 75Ω TO JACK COM1 IN2 MIC AMP NO2 COM2 Figure 3. Microphone Input Configuration ______________________________________________________________________________________ 11 MAX9517/MAX9524 Standard-Definition Video Filter Amplifiers with Dual SPST Switches VDD APPLICATION PROCESSOR MAX9517 SHDN +3.3V 0.1μF GND +3.3V BUFFER DAC CVBS VIDIN LPF AV = 2V/V VIDOUT 75Ω TO JACK VCC VCC IN1 BASEBAND IC OFF COM1 NO1 IN2 COM2 NO2 OFF Figure 4. Video Output Configuration VDD APPLICATION PROCESSOR OFF DAC MAX9517 SHDN +3.3V 0.1μF GND BUFFER CVBS VIDIN OFF VCC LPF AV = 2V/V OFF OFF VIDOUT 75Ω VCC BASEBAND IC OFF IN1 NO1 COM1 IN2 NO2 COM2 Figure 5. Digital Output Configuration 12 ______________________________________________________________________________________ TO JACK Standard-Definition Video Filter Amplifiers with Dual SPST Switches OFF DAC MAX9517 SHDN MAX9517/MAX9524 VDD APPLICATION PROCESSOR +3.3V 0.1μF GND BUFFER VIDIN CVBS OFF VCC LPF AV = 2V/V OFF OFF VIDOUT 75Ω TO JACK VCC IN1 BASEBAND IC COM1 NO1 IN2 COM2 NO2 OFF Figure 6. Digital Input Configuration +3.3V VDD MAX9517 SHDN 0.1μF GND BUFFER VIDIN LPF AV = 2V/V APPLICATION PROCESSOR VIDOUT 75Ω DAC SW1 IN1 NO1 SW2 COM1 IN2 NO2 COM2 MOBILE GPU DAC Figure 7. Selecting Between Two Internal Video Sources ______________________________________________________________________________________ 13 MAX9517/MAX9524 Standard-Definition Video Filter Amplifiers with Dual SPST Switches +3.3V VDD MAX9524 SHDN VIDIN SW_CONTROL CLAMP VIDOUT 6dB LPF 0.1μF GND 75Ω CVBS_OUT IN1 0.1μF COM1 NO1 CVBS_IN1 IN2 0.1μF CVBS_IN2 75Ω COM2 NO2 75Ω Figure 8. Selecting Between Two External Video Sources VDD 0.1μF APPLICATION PROCESSOR MAX9524 SHDN GPIO 1 VIDIN CLAMP GPIO 2 LPF C VIDOUT 75Ω COM1 IN2 NO2 DAC 6dB 0.1μF IN1 NO1 DAC GND +3.3V COM2 y Figure 9. Luma and Chroma Mixer Circuit (Chroma Current Routed into Resistor) 14 ______________________________________________________________________________________ CVBS Standard-Definition Video Filter Amplifiers with Dual SPST Switches 0.1μF APPLICATION PROCESSOR VIDIN CLAMP GPIO 2 C 6dB VIDOUT 0.1μF 75Ω LUMA COM1 IN2 NO2 DAC LPF GND +3.3V IN1 NO1 DAC MAX9524 SHDN GPIO 1 MAX9517/MAX9524 VDD COM2 y Figure 10. Luma and Chroma Mixer Circuit with Chroma Muted. Chroma Current is Shunted into Ground Through Analog Switch 2. ______________________________________________________________________________________ 15 MAX9517/MAX9524 Standard-Definition Video Filter Amplifiers with Dual SPST Switches Anti-Alias Filter Power-Supply Bypassing and Ground The MAX9524 can also provide anti-alias filtering with buffer before an analog-to-digital converter (ADC), which would be present in an NTSC/PAL video decoder, for example. Figure 11 shows an example application circuit for MAX9524. An external composite video signal is applied to IN, which is terminated with 75Ω to ground. The signal is AC-coupled to VIDIN because the DC level of an external video signal is usually not well specified. The MAX9517/MAX9524 operate from a single-supply voltage down to 2.7V, allowing for low-power operation. Bypass VDD to GND with a 0.1µF capacitor. Place all external components as close as possible to the device. MAX9524 VDD SHDN IN SHUTDOWN CIRCUIT VIDIN CLAMP AV = 2V/V LPF VIDOUT VIDEO DECODER 75Ω 0.1μF 75Ω 75Ω Figure 11. MAX9524 is Used as an Anti-Alias Filter with Buffer (Switches Can Route Other Signals) Switch Test Circuits/Timing Diagrams MAX9517 MAX9524 VDD LOGIC INPUT V DD COM VNO VIL 50% VOUT RL t OFF CL IN_ VOUT GND LOGIC INPUT t r < 5ns t f < 5ns VIH SWITCH OUTPUT 0.9 x V0UT 0V t ON CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL RL + RON VOUT = VN_ ( ) Figure 12. Switching Time 16 ______________________________________________________________________________________ 0.9 x VOUT Standard-Definition Video Filter Amplifiers with Dual SPST Switches RS IN+ MAX9517 MAX9524 COM1 NO1 OUT+ CL RS IN- COM2 NO2 OUTCL LOGIC INPUT 0V TO VDD tINRISE tINFALL VDD 90% 90% 50% VIN+ 10% 10% 0V VDD 50% VIN0V tOUTFALL VDD VDD tOUTRISE 90% 90% 50% VOUT+ 10% 0V 10% VDD 50% VOUT0V tSKEW Figure 13. Output Signal Skew ______________________________________________________________________________________ 17 MAX9517/MAX9524 Switch Test Circuits/Timing Diagrams (continued) MAX9517/MAX9524 Standard-Definition Video Filter Amplifiers with Dual SPST Switches Switch Test Circuits/Timing Diagrams (continued) V DD MAX9517 MAX9524 ΔVOUT VDD RGEN COM_ VOUT NO + VOUT CL V GEN IN_ GND ON OFF IN 0V TO VDD OFF Q = (ΔV OUT )(C L ) Figure 14. Charge Injection VDD 10nF OFF-ISOLATION = 20log(VOUT/VIN) NETWORK ANALYZER VIN 0V OR VDD IN_ VDD 50Ω ON-LOSS = 20log(VOUT/VIN) 50Ω CROSSTALK = 20log(VOUT/VIN) COM_ MAX9517 MAX9524 VOUT NO_ MEAS REF GND 50Ω 50Ω MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND OFF NO_ TERMINAL ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN COM_ AND ON NO_ TERMINAL ON EACH SWITCH. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED. Figure 15. On-Loss, Off-Isolation, and Crosstalk 10nF VDD VDD COM_ MAX9517 MAX9524 CAPACITANCE ANALYZER f = 1MHz IN 0V OR VDD NO_ GND Figure 16. Channel Off-/On-Capacitance 18 ______________________________________________________________________________________ Standard-Definition Video Filter Amplifiers with Dual SPST Switches +3.3V VDD APPLICATION PROCESSOR MAX9517 SHDN 0.1μF GND BUFFER DAC 75Ω VIDIN CVBS LPF AV = 2V/V CVBS IN1 COM1 NO1 MICROCONTROLLER IN2 COM2 NO2 +3.3V VDD APPLICATION PROCESSOR DAC VDD MAX9524 SHDN CVBS 0.1μF VIDIN CLAMP LPF 0.1μF GND AV = 2V/V VIDOUT 75Ω CVBS IN1 NO1 MICROCONTROLLER COM1 IN2 NO2 COM2 ______________________________________________________________________________________ 19 MAX9517/MAX9524 Typical Operating Circuits Standard-Definition Video Filter Amplifiers with Dual SPST Switches MAX9517/MAX9524 Pin Configuration Chip Information SHDN NO1 NO2 PROCESS: BiCMOS TOP VIEW 9 8 7 IN1 10 IN2 11 MAX9517 MAX9524 VDD 12 EP* 6 VIDIN 5 GND 4 VIDOUT 1 2 3 N.C. COM1 COM2 + THIN QFN (3mm x 3mm) *EP = EXPOSED PADDLE 20 ______________________________________________________________________________________ Standard-Definition Video Filter Amplifiers with Dual SPST Switches 12x16L QFN THIN.EPS (NE - 1) X e E MARKING E/2 D2/2 (ND - 1) X e D/2 AAAA e CL D D2 k CL b 0.10 M C A B E2/2 L E2 0.10 C C L 0.08 C C L A A2 A1 L L e e PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm 21-0136 I 1 2 ______________________________________________________________________________________ 21 MAX9517/MAX9524 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) MAX9517/MAX9524 Standard-Definition Video Filter Amplifiers with Dual SPST Switches Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) PKG 8L 3x3 12L 3x3 REF. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. A 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 b 0.25 0.30 0.35 0.20 0.25 0.30 0.20 0.25 0.30 D 2.90 3.00 3.10 2.90 3.00 3.10 2.90 3.00 3.10 E 2.90 3.00 3.10 2.90 3.00 3.10 2.90 3.00 3.10 e L 0.65 BSC. 0.35 0.55 16L 3x3 0.50 BSC. 0.50 BSC. 0.75 0.45 0.55 0.65 0.30 0.40 N 8 12 16 ND 2 3 4 2 NE 0 A1 A2 k 0.02 3 0.05 0 0.20 REF 0.25 - 0.02 0.25 - 0.50 4 0.05 0 0.20 REF - EXPOSED PAD VARIATIONS 0.02 0.05 0.20 REF - 0.25 - PKG. CODES E2 D2 MIN. NOM. MAX. MIN. NOM. MAX. PIN ID JEDEC TQ833-1 0.25 0.70 1.25 0.25 0.70 1.25 0.35 x 45° WEEC T1233-1 0.95 1.10 1.25 0.95 1.10 1.25 0.35 x 45° WEED-1 T1233-3 0.95 1.10 1.25 0.95 1.10 1.25 0.35 x 45° WEED-1 T1233-4 0.95 1.10 1.25 0.95 1.10 1.25 0.35 x 45° WEED-1 T1633-2 0.95 1.10 1.25 0.95 1.10 1.25 0.35 x 45° WEED-2 T1633F-3 0.65 0.80 0.95 0.65 0.80 0.95 0.225 x 45° WEED-2 T1633FH-3 0.65 0.80 0.95 0.65 0.80 0.95 0.225 x 45° WEED-2 T1633-4 0.95 1.10 1.25 0.95 1.10 1.25 0.35 x 45° WEED-2 T1633-5 0.95 1.10 1.25 0.95 1.10 1.25 0.35 x 45° WEED-2 - NOTES: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES. N IS THE TOTAL NUMBER OF TERMINALS. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.20 mm AND 0.25 mm FROM TERMINAL TIP. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS. DRAWING CONFORMS TO JEDEC MO220 REVISION C. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY. WARPAGE NOT TO EXCEED 0.10mm. PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm 21-0136 I 2 2 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. 22 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.