FHP3194IM14X

FHP3194 4:1 High-Speed Multiplexer October 2006 FHP3194 4:1 High-Speed Multiplexer Features ■ 0.1dB gain flatness to 90MHz @ 2Vpp ■ 0.02%/0.05˚ differential gain/phase error ■ 500MHz large signal -3dB bandwidth at G = 2 ■ 2200V/µs slew rate ■ 75mA output current (easily drives two video loads) ■ 70dB channel-to-channel isolation ■ 13mA supply current ■ 3.5mA supply current in disable mode ■ 2.5mA supply current in shutdown mode ■ Fully specified at ±5V supplies ■ Lead-free SOIC-14 and TSSOP-14 packages Description The FHP3194 is a 4:1 analog multiplexer designed for high-speed video applications. The output amplifier is a high-speed current feedback amplifier that offers stellar large signal performance of 500MHz -3dB bandwidth and 90MHz 0.1dB bandwidth. The gain of the output amplifier is selectable through two external resistors (Rf and Rg), allowing further design flexibility. The 2Vpp bandwidth performance and 2200V/µs slew rate exceed the requirements of high-definition television (HDTV) and other multimedia applications. The output amplifier also provides ample output current to drive multiple video loads. Two address bits (A0 and A1) are used to select one of the four inputs. The FHP3194 offers better than 70dB channel isolation. The FHP3194 offers both shutdown and disable capability. During shutdown, the FHP3194 consumes only 2.5mA of supply current. During disable mode, only the output amplifier is disabled, reducing output glitches and allowing for multiplexer expansion. FHP3194 SOIC/TSSOP IN1 GND IN2 GND IN3 -Vs IN4 1 2 3 4 14 13 12 11 Applications ■ Video switchers and routers ■ Multiple input HDTV switching ■ Picture-in-picture video switch ■ Multi-channel ADC driver Functional Block Diagram +Vs OU T -VIN SD EN A1 A0 LOGIC 5 6 7 10 9 8 Ordering Information Part Number FHP3194IM14X FHP3194IMTC14X Moisture sensitivity level for all parts is MSL-1. Package SOIC-14 TSSOP-14 Pb-Free Yes Yes Operating Temperature Range -40°C to +85°C -40°C to +85°C Packaging Method Reel Reel © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Pin Configuration FHP3194 SOIC/TSSOP IN1 GND IN2 GND IN3 -Vs IN4 1 2 3 4 14 13 12 11 +Vs OU T -VIN SD EN A1 A0 LOGIC 5 6 7 10 9 8 Pin Assignments Pin# 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin Name IN1 GND IN2 GND IN3 -Vs IN4 A0 A1 EN SD -VIN OUT +Vs Input, channel 1 Must be connected to ground Input, channel 2 Must be connected to ground Input, channel 3 Negative supply Input, channel 4 Logic input A0 Logic input A1 Description Enable pin, “1” = Disable, “0” = Enable; Enabled when left floating Shutdown pin, “1” = Shutdown, “0” = Active; Active when left floating Inverting Input of output amplifier Output Positive supply Truth Table A0 1 0 1 0 X X A1 1 1 0 0 X X EN 0 0 0 0 1 X SD 0 0 0 0 0 1 OUT CH4 CH3 CH2 CH1 Disable Shutdown © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1  www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Absolute Maximum Ratings The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table defines the conditions for actual device operation. Parameter Supply Voltage Input Voltage Range Min. 0 -Vs -0.5V Max. 12.6 +Vs +0.5V Unit V V Reliability Information Parameter Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10s) Package Thermal Resistance 14-Lead TSSOP1 14-Lead SOIC 1 Min. -65 Typ. Max. 150 150 300 Unit °C °C °C °C/W °C/W 113 125 Notes: 1. Package thermal resistance (qJA), JDEC standard, multi-layer test boards, still air. ESD Protection Product Human Body Model (HBM) Charged Device Model (CDM) SOIC-14 3.5kV 2kV TSSOP-14 3kV 2kV Recommended Operating Conditions Parameter Operating Temperature Range Supply Voltage Range Min. -40 5 Typ. Max. +85 12 Unit °C V © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 3 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Electrical Characteristics at ±5V TA = 25°C, Vs = ±5V, Rf = 475Ω, RL =150Ω, G = 2; unless otherwise noted. Symbol UGBW BWSS BWLS Parameter -3dB Bandwidth -3dB Bandwidth Full Power Bandwidth 0.1dB Gain Flatness 0.1dB Gain Flatness Conditions G = +1, Rf = 1.5kΩ VOUT = 0.2Vpp G = +2, VOUT = 0.2Vpp G = +2, VOUT = 2Vpp G = +2, VOUT = 0.2Vpp G = +2, VOUT = 2Vpp VOUT = 2V step; (10% to 90%) VOUT = 2V step VOUT = 0.2V step 4V step 2Vpp, 5MHz, worst channel 2Vpp, 5MHz, worst channel 2Vpp, 5MHz, worst channel NTSC (3.58MHz), DC-coupled NTSC (3.58MHz), DC-coupled > 1MHz > 1MHz > 1MHz Channel-to-channel 5MHz/ 30MHz, worst CH combination Min. Typ. 1200 800 500 200 90 1 15 4 2200 -68 -89 -67 0.02 0.05 7 22 16 -68/-53 Max. Units MHz MHz MHz MHz MHz ns ns % V/µs dBc dBc dB % ° nV/√Hz pA/Hz pA/Hz dB Frequency Domain Response Time Domain Response tR, tF tS OS SR HD2 HD3 THD DG DP en in+ inXTALK Rise and Fall Time Settling Time to 0.1% Overshoot Slew Rate 2nd Harmonic Distortion 3rd Harmonic Distortion Total Harmonic Distortion Differential Gain Differential Phase Input Voltage Noise Input Current Noise (+) Input Current Noise (-) All Hostile Crosstalk Distortion / Noise Response DC Performance VIO dVIO VIOM Ibn dIbn Ibi dIbni GM PSRR IS IEN ISD Input Offset Voltage(1) Average Drift Input Offset Voltage Matching(1) Input Bias Current Non-inverting(1) Average Drift Input Bias Current Inverting(1) Average Drift Gain Matching Power Supply Rejection Ratio Supply Current(1) Disable Supply Current(1) Shutdown Supply Current(1) Switching Time 50% Logic to: TS 90% output (10% output settling)(2) 99% output (1% output settling)(2) VSW Notes: 1. 100% tested at 25°C (1) -9 Channel-to-channel Pins 1,3,5,7 Pin 12 Channel-to-channel DC Disable mode Shutdown mode Channel-to-channel IN1, IN3 = +0.5V; IN2, IN4 = -0.5V IN1, IN3 = +0.5V; IN2, IN4 = -0.5V All inputs grounded 54 -5 -30 -35 1 8.5 0.8 4 25 13 20 0.02 65 13 3.5 2.5 +9 5 30 35 mV µV/°C mV µA nA/°C µA nA/°C % dB 18 6 5 mA mA mA Switching Characteristics 25 40 375 ns ns mVpp Channel Switch. Trans. (Glitch) © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 4 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Electrical Characteristics at ±5V (Continued) TA = 25°C, Vs = ±5V, Rf = 475Ω, RL =150Ω, and G = 2 unless otherwise noted. Symbol Digital Inputs VIH VIL IIH IIL Logic-High Threshold Logic-Low Threshold Logic Pin Input Current High Logic Pin Input Current Low A0, A1, EN, and SD pins A0, A1, EN, and SD pins A0, A1, EN, and SD pins Logic input =0V A0, A1, EN, and SD pins Logic input =0V 5MHz/30MHz, worst comb. 5MHz/30MHz, worst comb. 5MHz/30MHz, worst comb. VIN = 500mV VIN = 500mV VIN = 500mV VIN = 500mV (3) Parameter Conditions Min. 2.0 Typ. Max. Unit V 0.8 22 0 V µA µA Disable Characteristics ENISO SDISO CHISO ENTON ENTOFF SDTON SDTOFF RIN CIN CMIR CMRR Disable Isolation Shutdown Isolation CH-to-CH Isolation Turn-on time (Disable to ON) Turn-off time (ON to Disable) Turn-on time (Shutdown to ON) Turn-off time (ON to Shutdown) Input Resistance Input Capacitance Input Common Mode V Range Common Mode Rejection Ratio(1) DC RL = 2kW RL = 150W VIN = 0 Enabled Disabled (1) -76/-61 -76/-61 -70/-55 30 65 32 66 188 1.7 ±3.1 50 60 ±4.0 ±3.2 ±3.8 ±75 ±100 0.1 1 3.7 dB dB dB ns ns ns ns kW pF V dB V V mA mA Ω kΩ pF Input Characteristics Output Characteristics VOUT IOUT ISC ROUT COUT Notes: 1. 100% tested at 25°C 2. SD and EN pins are grounded. IN1 and IN3 = +0.5V, IN2 and IN4 = -0.5V, see truth table to properly set A0 and A1 based on the channels driven. Switching time is the transition time from 50% of A0 or A1 input value (+2.5V) to the time at which the switched channel is at 90% (or 99%) of its final value. 3. Driving one channel and looking at worst case value from remaining channels. Output Voltage Swing Linear Output Current Short-Circuit Output Current Output Resistance Output Capacitance VOUT = GND, RL = 0Ω © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 5 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Typical Performance Characteristics TA = 25°C, Vs = ±5V, Rf = 475Ω, RL =150Ω, and G = 2 unless otherwise noted. 6 0.1 0 VS = 5V G=1 RF = 1.5kΩ G=2 RF = 475Ω G=5 RF = 300Ω G = 10 RF = 150Ω Vo = 0.2Vpp Normalized Gain (dB) Normalized Gain (dB) 3 0 -3 -6 -9 -12 0.1 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 -1 Vo = 2Vpp 1 10 100 1000 10000 0.1 1 10 100 1000 Frequency (MHz) Frequency (MHz) Figure 1. Non-Inverting Freq. Response 1600 1400 1200 Figure . Gain Flatness vs. Frequency 0.1 0 Normalized Gain (dB) -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 -1 Vo = 2Vpp Rf Value 1000 800 600 400 200 0 1 2 3 4 5 6 7 8 9 10 0.1 1 10 100 1000 Gain (V/V) Frequency (MHz) Figure 3. Recommended Rf vs. Gain 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8 -9 0.1 Figure 4. Gain Flatness vs. Frequency 3 Normalized Gain (dB) Normalized Gain (dB) 0 -3 -6 -9 VOUT = 4Vpp VOUT = 2Vpp VOUT = 1Vpp CL = 20pF Rs = 26Ω CL = 56pF Rs = 13Ω CL = 100pF Rs = 16Ω Vo = 0.2Vpp -12 -15 -18 1 10 100 1000 0.1 1 10 100 1000 10000 Frequency (MHz) Frequency (MHz) Figure 5. Frequency Response vs. CL Figure . Frequency Response vs. VOUT © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1  www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Typical Performance Characteristics TA = 25°C, Vs = ±5V, Rf = 475Ω, RL =150Ω, and G = 2 unless otherwise noted. 70 60 60 50 Worst Channel 40 30 20 10 10k 100k 1M 10M 100M 1G CMRR (dB) PSRR (dB) 50 40 30 20 10 0 10k 100k 1M 10M 100M 1G Frequency (Hz) Frequency (Hz) Figure . PSRR vs. Frequency 106 0 -45 -50 Figure 8. CMRR vs. Frequency Frequency RL = 150Ω Vo = 2Vpp Transimpedance (Ω) 105 Transimpedance Phase -55 HD2 (dBc) 100 Worst CH Phase (deg) -60 -65 -70 -75 -80 Best CH 104 -200 10 3 10 2 -300 10k 100k 1M 10M 100M 1G -85 1 10 30 Frequency (Hz) Frequency (MHz) Figure 9. Open Loop Transimpedance Gain and Phase -60 -65 -70 RL = 150Ω Vo = 2Vpp All Channels Figure 10. HD vs. Frequency -40 -45 -50 -55 -60 -65 -70 -75 -80 -85 -90 Best CH 50MHz Best CH 5MHz Best CH 30MHz Worst CH 5MHz Worst CH 30MHz Worst CH 50MHz HD2 (dBc) -75 -80 -85 -90 -95 1 10 30 HD2 (dBc) 1 1.5 2 2.5 3 3.5 4 4.5 5 Frequency (MHz) VOUT (Vpp) Figure 11. HD3 vs. Frequency Figure 1. HD vs. VOUT © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1  www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Typical Performance Characteristics TA = 25°C, Vs = ±5V, Rf = 475Ω, RL =150Ω, and G = 2 unless otherwise noted. -55 -60 -65 All Channels 50MHz 0.008 0.004 AC Coupled, 220µF 0.008 0.004 0 Gain Phase Differential Phase (deg) Differential Gain (%) 0 -0.004 -0.008 -0.012 -0.016 -0.020 -0.024 -0.028 HD3 (dBc) -70 -75 -80 -85 -90 -95 1 1.5 2 2.5 3 3.5 4 -0.004 -0.008 -0.012 -0.016 -0.020 -0.024 -0.028 30MHz 5MHz 4.5 5 -0.7 -0.5 -0.3 -0.1 0.1 0.3 0.5 0.7 VOUT (Vpp) Input Amplitude (V) Figure 13. HD3 vs. VOUT 0.06 0.06 DC Coupled Figure 14. Differential Gain and Phase 5 4 3 2 RL = 150Ω RL = 10kΩ Differential Gain (%) 0.05 0.04 0.03 0.02 0.01 0 -0.01 -0.02 -0.03 -0.04 -0.05 0.05 0.04 Phase Gain Differential Phase (deg) 0.03 0.02 0.01 0 -0.01 -0.02 -0.03 -0.04 -0.05 VOUT (V) 1 0 -1 -2 -3 -4 -5 -5 -4 -3 -2 RL = 1kΩ RL = 100Ω RL = 75Ω -0.7 -0.5 -0.3 -0.1 0.1 0.3 0.5 0.7 -1 0 1 2 3 4 5 Input Amplitude (V) VIN (V) Figure 15. Differential Gain and Phase Figure 1. Output Swing vs. RL 1.5 2.5 Vs = 5V 2.0 1.0 Output (V) 1.0 0.5 0 -0.5 0 10 20 30 40 50 60 70 80 90 100 Output (V) 1.5 0.5 0 -0.5 -1.0 -1.5 0 10 20 30 40 50 60 70 80 90 100 Time (ns) Time (ns) Figure 1. Pulse Response Figure 18. Pulse Response © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 8 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Typical Performance Characteristics TA = 25°C, Vs = ±5V, Rf = 475Ω, RL =150Ω, and G = 2 unless otherwise noted. 6 4 14 12 10 2.0 1.5 1.0 A0 Input (V) Output (V) 2 0 -2 -4 -6 0 20 40 60 80 100 120 140 Output (V) 8 6 4 2 0 -2 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Output A0 Input 0.5 0 -0.5 -1.0 -1.5 -2.0 Time (ns) Time (ns) Figure 19. Pulse Response 6 5 4 A0 Input Figure 0. Channel Switching Time 0.6 0.5 0.4 6 5 4 A1 Input 0.6 0.5 0.4 0.3 0.2 Output A0 Input (V) A1 Input (V) 3 2 1 0 -1 -2 -3 0 100 200 300 400 500 600 700 800 900 1000 Output 0.3 0.2 0.1 0 3 2 1 0 -1 -2 -3 0 100 200 300 400 500 600 700 800 900 1000 -0.1 -0.2 -0.3 Output (V) Output (V) 0.1 0 -0.1 -0.2 -0.3 Time (ns) Time (ns) Figure 1. A0 Switching Glitch Figure . A1 Switching Glitch 16 14 12 1.6 1.4 1.2 8 7 6 5 4 3 2 1 0 -1 -2 0 100 200 300 400 500 600 700 800 900 1000 Output SD Input 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 SD Input (V) SD Input (V) 10 8 6 4 2 0 -2 0 100 200 300 400 500 600 700 Output SD Input 1.0 0.8 0.6 0.4 0.2 0 -0.2 Output (V) Output (V) Time (ns) Time (ns) Figure 3. Shutdown Switching Time Figure 4. Shutdown Switching Glitch © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 9 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Typical Performance Characteristics TA = 25°C, Vs = ±5V, Rf = 475Ω, RL =150Ω, and G = 2 unless otherwise noted. 16 14 12 1.6 1.4 1.2 6 5 4 EN Input 0.6 0.5 0.4 0.3 0.2 0.1 Output EN Input (V) EN Input (V) 10 8 6 4 2 0 -2 0 100 200 300 400 500 600 700 Output EN Input 1.0 0.8 0.6 0.4 0.2 0 3 2 1 0 -1 -2 -3 0 100 200 300 400 500 600 700 800 900 1000 -0.2 Output (V) Output (V) 0 -0.1 -0.2 -0.3 Time (ns) Time (ns) Figure 5. Enable Switching Time -40 -45 -50 -20 -30 Figure . Enable Switching Glitch Selected input to output Unselected input to output Worst condition shown Off Isolation (dB) -60 -65 -70 -75 -80 -85 -90 1 Crosstalk (dB) 100 -55 SD EN -40 -50 -60 -70 -80 -90 10 1 10 100 1000 Frequency (MHz) Frequency (MHz) Figure . Off Isolation vs. Frequency 100 Figure 8. Crosstalk vs. Frequency 104 103 102 Disabled Input Voltage Noise (nV/√Hz) 90 80 70 60 50 40 30 20 10 0 0.001 IZi (Ω) 101 100 10-1 10-2 Enabled 0.01 0.1 1 10 100 10k 100k 1M 10M 100M 1G Frequency (MHz) Frequency (Hz) Figure 9. Input Voltage Noise Figure 30. Closed-Loop Output Impedance © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 10 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Application Information Circuit Diagrams +5V 6.8µF 6dB (G = 2) Configuration IN1 75Ω 1 2 14 13 12 11 0.1µF 75Ω IN2 75Ω OUT RF = 475Ω 3 4 LOGIC SD RT* A1 A0 RT* RT* EN RT* RG = 475Ω IN3 75Ω 6.8µF 0.1µF 5 6 7 10 9 8 -5V IN4 75Ω *Termination resistors (RT = 50Ω) are optional. Figure 31. Typical Application Circuit dB Gain (G = ) +5V 6.8µF 0dB (G = 1) Configuration IN1 75Ω 1 2 14 13 0.1µF 75Ω OUT IN2 75Ω RF = 1.5k 3 4 12 11 LOGIC SD RT* A1 A0 RT* RT* EN RT* IN3 75Ω 6.8µF 0.1µF 5 6 7 10 9 8 -5V IN4 75Ω *Termination resistors (RT = 50Ω) are optional. Figure 3. Typical Application Circuit 0dB Gain (G = 1) © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 11 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Application Information General Description The FHP3194 4:1 multiplexer has four analog switches that drive the positive input of a high-speed current feedback amplifier. It is designed so that only one channel is on at a time. Tie unused inputs to ground. Figures 31 and 32 show typical application circuits for the FHP3194 in 6dB (G = 2) and 0dB (G = 1) configurations. At a single 5V supply, the CMIR becomes 1.9V to 3.1V. The same theory can be applied to the VOUT range. Driving Video The FHP3194 is designed to drive high-speed video. 90MHz 0.1dB bandwidth at 2Vpp output, 0.02˚/0.05% differential gain/phase, and ±75mA output current make the FHP3194 suitable for driving standard-definition, highdefinition, or PC graphics video. Rf and Rg Selection The output of the FHP3194 is a current feedback amplifier. The gain of this amplifier is set by two external resistors: Rf and Rg. The frequency response and closed-loop bandwidth of the current feedback amplifier are highly dependant on the value of Rf. For a gain of two, use Rf = 475Ω. For other gains, refer to the Rf vs. GAIN plot in Figure 3. In general, a lower Rf peaks the frequency response and increases bandwidth, while a higher Rf will decrease bandwidth and roll off the frequency response. A feedback resistor is required for unity gain (G = 1); the recommended value is 1.5kΩ. Driving Video with a Single 5V Supply The FHP3194 drives video signals from a single 5V supply at G = 1 only. At higher gains, the CMIR and Vo range is not suitable for passing video without clipping the signal. Driving Capacitive Loads The FREQUENCY RESPONSE VS. CL plot in Figure 5, illustrates the response of the FHP3194. A small series resistance (Rs) at the output of the amplifier, illustrated in Figure 33, improves stability and settling performance. Rs values in the FREQUENCY RESPONSE VS. CL plot were chosen to achieve maximum bandwidth with less than 1dB of peaking. For maximum flatness, use a larger Rs. + Rg Rf Rs CL RL A0, A1 The A0 and A1 logic pins are TTL/CMOS compatible and are used to select which of the four inputs connects to the output. Refer to the TRUTH TABLE on page 2 for more information. Channel 1 is selected if both pins are left floating. EN, SD The FHP3194 offers both shutdown and disable capability. The EN (enable) pin is active low. During disable mode (EN = 1), only the output amplifier is disabled, reducing output glitches and allowing for multiplexer expansion. The FHP3194 is enabled when the EN pin is left floating or grounded. The SD (shutdown) pin is active high. During shutdown (SD = 1), the FHP3194 consumes only 2.5mA of supply current. The FHP3194 is enabled when the SD pin is left floating or grounded. Figure 33. Typical Topology for Driving Capacitive Loads Power Dissipation The maximum internal power dissipation allowed is directly related to the maximum junction temperature. If the maximum junction temperature exceeds 150˚C for an extended time, device failure may occur. The FHP3194 is short-circuit protected; however, this may not guarantee that the maximum junction temperature (+150˚C) is not exceeded under all conditions. RMS power dissipation can be calculated using the following equation: Power Dissipation = Is * (Vs+ - Vs-) + (Vs+ - Vo(RMS)) * IOUT(RMS) where Is is the supply current, Vs+ is the positive supply pin voltage, Vs- is the negative supply pin voltage, Vo(RMS) is the RMS output voltage, and IOUT(RMS) is the RMS output current delivered to the load. Follow the maximum power derating curves shown in Figure 34 to ensure proper operation. Supply Voltage The FHP3194 operates from a single supply of 5V to 12V or dual supplies of ±2.5V to ±6.0V. For low supply voltage operation, ensure that the common mode input voltage range (CMIR) or output voltage range (Vo) are not exceeded. Exceeding the CMIR or Vo range puts the FHP3194 into an overdrive condition. For example, the typical CMIR for the FHP3194 is ±3.1V at ±5V supply, which means 1.9V of headroom is required from each supply. © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 1 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Maximum Power Dissipation (W) 1.8 1.6 1.4 SOIC-14 4.5 3.5 2.5 Output Pos_AV+5 Amplitude (V) 1.2 1.0 0.8 0.6 0.4 0.2 0 -40 -20 0 20 40 60 80 TSSOP-14 1.5 0.5 -0.5 -1.5 -2.5 -3.5 -4.5 0 Output Neg_AV+5 Input Neg_1Vpp Input Pos_1Vpp 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Ambient Temperature (°C) Time (µs) Figure 34. Maximum Power Derating Overdrive Recovery For an amplifier, an overdrive condition occurs when the output and/or input ranges are exceeded. The recovery time varies based on whether the input or output is overdriven and by how much the ranges are exceeded. The FHP3194 typically recovers in less than 75ns from an overdrive condition. Figure 35 shows the FHP3194 in an overdriven condition. Figure 35. Overdrive Recovery Layout Considerations General layout and supply bypassing play major roles in high-frequency performance. Fairchild has evaluation boards to use as a guide for high-frequency layout and as aid in device testing and characterization. Follow the guidelines below as a basis for high-frequency layout: ■ Include 6.8µF and 0.1µF ceramic capacitors. ■ Place the 6.8µF capacitor within 0.75 inches of the power pin. ■ Place the 0.1µF capacitor within 0.1 inches of the power pin. ■ Remove the ground plane under and around the part, especially near the input and output pins and under Rf and Rg, to reduce parasitic capacitance. ■ Minimize all trace lengths to reduce series inductances. For current feedback amplifiers, stray capacitance from the inverting input (pin 12) to ground or to the output (pin 13) increases peaking in the AC response. For optimum performance, place Rf and Rg as close to the FHP3194 as possible. Small-size surface-mount resistors are recommended. Avoid the use of vias near the device; vias add unwanted inductance. If traces of greater than one inch are required, use stripline or microstrip techniques designed with characteristic impedances of 50Ω or 75Ω that are properly terminated with impedance-matching elements at each end. Refer to the evaluation board layouts for more information. Evaluation Board Information The following evaluation boards are available to aid in the testing and layout of these devices: Evaluation Board KEB022 KEB025 Products FHP3194IM14X FHP3194IMTC14X © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 13 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Figure 3. KEB0 Top-Side Figure 38. KEB05 Top-Side Figure 3. KEB0 Bottom-Side Figure 39. KEB05 Bottom-Side VCC R1-1 75Ω C1 6.8µF + - IN1 C3 0.1µF + - OUT ROUT 75Ω R1-2 75Ω 1 2 3 FHP3194 NI1 GND1 NI2 GND2 NI3 VEE NI4 VS+ OUT VINV SD EN A1 A0 14 13 12 11 10 9 8 RF 475Ω RG 475Ω IN2 IN3 4 5 6 7 SD R5 50Ω R1-3 75Ω C2 6.8µF + + C4 0.1µF R1-4 75Ω R3 50Ω R2 50Ω A1 R4 50Ω EN VEE PWR IN4 A0 *Choose R1-1, R1-2, R1-3, R1-4, and ROUT for proper impedance matching. R2, R3, R4, and R5 are optional. Figure 40. FHP3194 Schematic Diagram © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 14 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Mechanical Dimensions Figure 41. SOIC-14 Package © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 15 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Mechanical Dimensions Figure 4. TSSOP-14 Package © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 1 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Rev. I20 www.fairchildsemi.com ©2006 Fairchild Semiconductor Corporation