FHP3194 4:1 High-Speed Multiplexer Features Description ■ 0.1dB gain flatness to 90MHz @ 2Vpp 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. ■ 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 Two address bits (A0 and A1) are used to select one of the four inputs. The FHP3194 offers better than 70dB channel isolation. Applications ■ Video switchers and routers ■ Multiple input HDTV switching 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. ■ Picture-in-picture video switch ■ Multi-channel ADC driver Functional Block Diagram FHP3194 SOIC/TSSOP 1 14 +Vs GND 2 13 OUT IN2 3 12 -VIN GND 4 11 SD IN3 5 10 EN -Vs 6 9 A1 IN4 7 8 A0 LOGIC IN1 Ordering Information Part Number FHP3194IM14X FHP3194IMTC14X Package Pb-Free Operating Temperature Range Packaging Method SOIC-14 TSSOP-14 Yes Yes -40°C to +85°C -40°C to +85°C Reel Reel Moisture sensitivity level for all parts is MSL-1. © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer October 2006 FHP3194 4:1 High-Speed Multiplexer Pin Configuration FHP3194 SOIC/TSSOP 1 14 +Vs GND 2 13 OU T IN2 3 12 -VIN GND 4 11 SD IN3 5 10 EN -Vs 6 9 A1 IN4 7 8 A0 LOGIC IN1 Pin Assignments Pin# Pin Name 1 IN1 2 GND Description Input, channel 1 Must be connected to ground 3 IN2 4 GND Input, channel 2 5 IN3 Input, channel 3 6 -Vs Negative supply 7 IN4 Input, channel 4 8 A0 Logic input A0 9 A1 Logic input A1 10 EN Enable pin, “1” = Disable, “0” = Enable; Enabled when left floating Shutdown pin, “1” = Shutdown, “0” = Active; Active when left floating Must be connected to ground 11 SD 12 -VIN Inverting Input of output amplifier 13 OUT Output 14 +Vs Positive supply Truth Table A0 A1 EN SD OUT 1 1 0 0 CH4 0 1 0 0 CH3 1 0 0 0 CH2 0 0 0 0 CH1 X X 1 0 Disable X X X 1 Shutdown © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 www.fairchildsemi.com 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 Min. Max. Unit 0 12.6 V -Vs -0.5V +Vs +0.5V V Supply Voltage Input Voltage Range Reliability Information Parameter Min. Typ. Junction Temperature Storage Temperature Range -65 Lead Temperature (Soldering, 10s) Max. Unit 150 °C 150 °C 300 °C Package Thermal Resistance 14-Lead TSSOP1 113 °C/W 14-Lead SOIC 125 °C/W 1 Notes: 1. Package thermal resistance (qJA), JDEC standard, multi-layer test boards, still air. ESD Protection Product SOIC-14 TSSOP-14 3.5kV 3kV 2kV 2kV Human Body Model (HBM) Charged Device Model (CDM) Recommended Operating Conditions Parameter Min. Operating Temperature Range Supply Voltage Range © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 Max. Unit -40 Typ. +85 °C 5 12 V www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Absolute Maximum Ratings TA = 25°C, Vs = ±5V, Rf = 475Ω, RL =150Ω, G = 2; unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Units Frequency Domain Response UGBW -3dB Bandwidth G = +1, Rf = 1.5kΩ VOUT = 0.2Vpp 1200 MHz BWSS -3dB Bandwidth G = +2, VOUT = 0.2Vpp 800 MHz BWLS Full Power Bandwidth G = +2, VOUT = 2Vpp 500 MHz 0.1dB Gain Flatness G = +2, VOUT = 0.2Vpp 200 MHz G = +2, VOUT = 2Vpp 90 MHz 0.1dB Gain Flatness Time Domain Response tR, tF Rise and Fall Time VOUT = 2V step; (10% to 90%) 1 ns tS Settling Time to 0.1% VOUT = 2V step 15 ns OS Overshoot VOUT = 0.2V step 4 % SR Slew Rate 4V step 2200 V/µs Distortion / Noise Response HD2 2nd Harmonic Distortion 2Vpp, 5MHz, worst channel -68 dBc HD3 3rd Harmonic Distortion 2Vpp, 5MHz, worst channel -89 dBc THD Total Harmonic Distortion 2Vpp, 5MHz, worst channel -67 dB DG Differential Gain NTSC (3.58MHz), DC-coupled 0.02 % DP Differential Phase NTSC (3.58MHz), DC-coupled 0.05 ° en Input Voltage Noise > 1MHz 7 nV/√Hz in+ Input Current Noise (+) > 1MHz 22 pA/Hz in- Input Current Noise (-) > 1MHz 16 pA/Hz XTALK All Hostile Crosstalk Channel-to-channel 5MHz/ 30MHz, worst CH combination -68/-53 dB DC Performance VIO dVIO Input Offset Voltage(1) -9 Average Drift 1 +9 8.5 mV µ���� V/°C VIOM Input Offset Voltage Matching(1) Channel-to-channel -5 0.8 5 mV Ibn Input Bias Current Non-inverting(1) Pins 1,3,5,7 -30 4 30 µ� A Pin 12 -35 dIbn Ibi dIbni Average Drift 25 Input Bias Current Inverting(1) Average Drift GM Gain Matching Channel-to-channel PSRR Power Supply Rejection Ratio IS Supply Current(1) IEN Disable Supply Current(1) ISD Shutdown Supply Current(1) (1) DC 54 13 nA��� /°C 35 µ� A 20 nA��� /°C 0.02 % 65 dB 13 18 mA Disable mode 3.5 6 mA Shutdown mode 2.5 5 mA Switching Characteristics Switching Time 50% Logic to: TS VSW Channel-to-channel 90% output (10% output settling)(2) IN1, IN3 = +0.5V; IN2, IN4 = -0.5V 25 ns 99% output (1% output settling)(2) IN1, IN3 = +0.5V; IN2, IN4 = -0.5V 40 ns All inputs grounded 375 mVpp Channel Switch. Trans. (Glitch) Notes: 1. 100% tested at 25°C © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Electrical Characteristics at ±5V TA = 25°C, Vs = ±5V, Rf = 475Ω, RL =150Ω, and G = 2 unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Unit Digital Inputs VIH Logic-High Threshold A0, A1, EN, and SD pins 2.0 V VIL Logic-Low Threshold A0, A1, EN, and SD pins IIH Logic Pin Input Current High A0, A1, EN, and SD pins Logic input =0V 22 μA IIL Logic Pin Input Current Low A0, A1, EN, and SD pins Logic input =0V 0 μA 0.8 V Disable Characteristics ENISO Disable Isolation 5MHz/30MHz, worst comb. -76/-61 dB SDISO Shutdown Isolation 5MHz/30MHz, worst comb. -76/-61 dB CHISO CH-to-CH Isolation 5MHz/30MHz, worst comb. -70/-55 dB ENTON Turn-on time (Disable to ON) VIN = 500mV 30 ns ENTOFF Turn-off time (ON to Disable) VIN = 500mV 65 ns SDTON Turn-on time (Shutdown to ON) VIN = 500mV 32 ns SDTOFF Turn-off time (ON to Shutdown) VIN = 500mV 66 ns kW pF (3) Input Characteristics RIN Input Resistance 188 CIN Input Capacitance 1.7 CMIR Input Common Mode V Range CMRR Common Mode Rejection Ratio(1) DC 50 ±3.1 V 60 dB ±4.0 ±3.8 V V ±75 mA ±100 mA 0.1 Ω 1 kΩ 3.7 pF Output Characteristics RL = 2kW VOUT Output Voltage Swing IOUT Linear Output Current RL = 150W VIN = 0 ISC Short-Circuit Output Current VOUT = GND, RL = 0Ω ROUT Output Resistance COUT Output Capacitance (1) Enabled Disabled ±3.2 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. © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 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. 6 0.1 3 -0.1 VS = 5V Normalized Gain (dB) Normalized Gain (dB) 0 G=1 RF = 1.5kΩ 0 G=2 RF = 475Ω -3 G=5 RF = 300Ω -6 G = 10 RF = 150Ω -9 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 Vo = 0.2Vpp -12 Vo = 2Vpp -1 0.1 1 10 100 1000 10000 0.1 1 Frequency (MHz) Figure 1. Non-Inverting Freq. Response 1000 0.1 0 Normalized Gain (dB) 1400 1200 1000 Rf Value 100 Figure 2. Gain Flatness vs. Frequency 1600 800 600 400 200 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 0 Vo = 2Vpp -1 1 2 3 4 5 6 7 8 9 10 0.1 1 Gain (V/V) 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8 -9 10 100 1000 Frequency (MHz) Figure 3. Recommended Rf vs. Gain Figure 4. Gain Flatness vs. Frequency 3 Normalized Gain (dB) Normalized Gain (dB) 10 Frequency (MHz) CL = 20pF Rs = 26Ω CL = 56pF Rs = 13Ω CL = 100pF Rs = 16Ω Vo = 0.2Vpp 0 -3 -6 -9 VOUT = 4Vpp -12 VOUT = 2Vpp -15 VOUT = 1Vpp -18 0.1 1 10 100 1000 0.1 Frequency (MHz) 10 100 1000 10000 Frequency (MHz) Figure 5. Frequency Response vs. CL © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 1 Figure 6. Frequency Response vs. VOUT 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. 60 Worst Channel 60 50 50 40 CMRR (dB) PSRR (dB) 70 40 30 20 30 20 10 10 0 10k 100k 1M 10M 100M 1G 10k 100k Frequency (Hz) Figure 7. PSRR vs. Frequency 0 -45 -55 104 -200 10 2 HD2 (dBc) 100 Phase (deg) Transimpedance (Ω) Phase Transimpedance 10 100M 1G RL = 150Ω Vo = 2Vpp -50 3 10M Figure 8. CMRR vs. Frequency ��������� 106 105 1M Frequency (Hz) Worst CH -60 -65 -70 Best CH -75 -80 -300 10k 100k 1M 10M 100M -85 1G 1 10 Frequency (Hz) Figure 9. Open Loop Transimpedance Gain and Phase -60 Figure 10. HD2 vs. Frequency -40 RL = 150Ω Vo = 2Vpp -65 Worst CH 50MHz Worst CH 30MHz -45 All Channels -50 HD2 (dBc) -70 HD2 (dBc) 30 Frequency (MHz) -75 -80 -55 -60 Best CH 30MHz -65 Worst CH 5MHz -70 Best CH 50MHz -75 -85 Best CH 5MHz -80 -90 -85 -95 -90 1 10 30 1 Frequency (MHz) 2 2.5 3 3.5 4 4.5 5 VOUT (Vpp) Figure 11. HD3 vs. Frequency © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 1.5 Figure 12. HD2 vs. VOUT 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 0.008 All Channels Differential Gain (%) 0.004 HD3 (dBc) -65 -70 0.008 AC Coupled, 220µF 30MHz -75 -80 0 -0.004 -0.004 Gain -0.008 -0.008 Phase -0.012 -0.012 -0.016 -0.016 -0.020 -0.020 -90 -0.024 -0.024 -95 -0.028 5MHz -85 1 1.5 2 2.5 3 3.5 4 4.5 5 -0.028 -0.7 -0.5 -0.3 VOUT (Vpp) 4 0.02 0.01 Gain 0 0 Differential Phase (deg) 5 0.05 0.04 0.03 Phase 0.02 0.01 0.06 0 -0.02 -0.03 -0.04 -0.04 -4 -0.05 -0.05 -5 -0.1 0.1 0.3 0.5 RL = 10kΩ RL = 100Ω -1 -0.02 -0.03 -0.3 0.7 1 -0.01 -0.5 0.5 RL = 150Ω 2 -0.01 -0.7 0.3 3 VOUT (V) DC Coupled 0.03 0.1 Figure 14. Differential Gain and Phase 0.06 0.05 0.04 -0.1 Input Amplitude (V) Figure 13. HD3 vs. VOUT Differential Gain (%) 0.004 0 Differential Phase (deg) -60 50MHz RL = 75Ω -2 -3 0.7 RL = 1kΩ -5 -4 -3 -2 Input Amplitude (V) -1 0 1 2 3 4 5 VIN (V) Figure 15. Differential Gain and Phase Figure 16. Output Swing vs. RL 2.5 1.5 2.0 1.0 1.5 0.5 Output (V) Output (V) Vs = 5V 1.0 0.5 0 0 -0.5 -1.0 -0.5 -1.5 0 10 20 30 40 50 60 70 80 90 100 0 Time (ns) 20 30 40 50 60 70 80 90 100 Time (ns) Figure 17. Pulse Response © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 10 Figure 18. Pulse Response 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 12 1.5 10 1.0 A0 Input (V) 2 2.0 0 -2 8 0.5 6 -0.5 -1.5 -2 0 20 40 60 80 100 120 140 -2.0 0 Time (ns) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Time (ns) Figure 19. Pulse Response Figure 20. Channel Switching Time 0.6 6 5 0.5 5 4 0.4 4 0.4 3 0.3 3 0.3 2 0.2 2 0.2 1 0.1 A0 Input 0 0 0.6 0.5 A1 Input 1 0.1 Output 0 Output (V) Output A1 Input (V) 6 Output (V) A0 Input (V) -1.0 Output 0 -6 0 -1 -0.1 -1 -0.1 -2 -0.2 -2 -0.2 -3 -0.3 -3 0 100 200 300 400 500 600 700 800 900 1000 -0.3 0 Time (ns) 100 200 300 400 500 600 700 800 900 1000 Time (ns) Figure 21. A0 Switching Glitch Figure 22. A1 Switching Glitch 1.6 8 0.7 14 1.4 7 0.6 12 1.2 6 10 1.0 5 6 0.6 SD Input 0.5 SD Input 0.4 4 0.3 3 0.2 2 0.1 Output Output (V) 0.8 8 SD Input (V) 16 Output (V) SD Input (V) 0 A0 Input 4 2 -4 Output (V) Output (V) 4 14 4 0.4 2 0.2 0 -0.1 0 -1 -0.2 -0.2 -2 Output 0 -2 0 100 200 300 400 500 600 700 0 -0.3 0 Time (ns) 100 200 300 400 500 600 700 800 900 1000 Time (ns) Figure 23. Shutdown Switching Time © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 1 Figure 24. Shutdown Switching Glitch 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 14 1.4 5 12 1.2 4 0.4 10 1.0 3 0.3 8 0.8 2 0.2 EN Input (V) 0.6 1 0.1 Output 0 0.4 2 0.2 -1 -0.1 0 -2 -0.2 -0.2 -3 Output -2 0 100 200 300 400 500 600 -0.3 700 0 100 200 300 400 500 600 700 800 900 1000 Time (ns) Time (ns) Figure 25. Enable Switching Time -40 Figure 26. Enable Switching Glitch -20 Selected input to output -45 Unselected input to output Worst condition shown -30 -50 -55 -60 Crosstalk (dB) Off Isolation (dB) 0 4 0 SD -65 EN -70 -75 -80 -40 -50 -60 -70 -80 -85 -90 -90 1 10 100 1 10 Frequency (MHz) 100 1000 Frequency (MHz) Figure 27. Off Isolation vs. Frequency Figure 28. Crosstalk vs. Frequency 104 100 90 103 80 70 Disabled 102 60 IZi (Ω) Input Voltage Noise (nV/√Hz) 0.5 EN Input Output (V) 0.6 Output (V) 6 EN Input EN Input (V) 1.6 16 50 40 101 100 30 20 10-1 Enabled 10 0 0.001 10-2 0.01 0.1 1 10 100 10k Frequency (MHz) 1M 10M 100M 1G Frequency (Hz) Figure 29. Input Voltage Noise © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 100k Figure 30. Closed-Loop Output Impedance 10 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Typical Performance Characteristics Circuit Diagrams +5V 6.8µF 6dB (G = 2) Configuration IN1 1 14 2 13 3 12 4 11 0.1µF 75Ω IN2 75Ω IN3 75Ω LOGIC 75Ω 5 6.8µF 6 OUT RF = 475Ω SD RT* 10 A1 9 0.1µF -5V EN RT* RT* A0 8 7 RG = 475Ω RT* IN4 75Ω *Termination resistors (RT = 50Ω) are optional. Figure 31. Typical Application Circuit 6dB Gain (G = 2) +5V 6.8µF 0dB (G = 1) Configuration IN1 1 14 2 13 0.1µF 75Ω 75Ω 75Ω 75Ω 6.8µF 3 12 4 11 5 6 LOGIC IN2 IN3 OUT RF = 1.5k 0.1µF 10 -5V A1 9 8 7 SD RT* A0 EN RT* RT* RT* IN4 75Ω *Termination resistors (RT = 50Ω) are optional. Figure 32. 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. Driving Video Figures 31 and 32 show typical application circuits for the FHP3194 in 6dB (G = 2) and 0dB (G = 1) configurations. 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 Driving Video with a Single 5V Supply 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. 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. 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. + - Rf CL RL Rg EN, SD Figure 33. Typical Topology for Driving Capacitive Loads 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. 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: 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. Supply Voltage Power Dissipation = Is * (Vs+ - Vs-) + (Vs+ - Vo(RMS)) * IOUT(RMS) 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 Rs 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. 12 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer At a single 5V supply, the CMIR becomes 1.9V to 3.1V. The same theory can be applied to the VOUT range. Application Information 3.5 SOIC-14 Output Pos_AV+5 2.5 1.4 Amplitude (V) Maximum Power Dissipation (W) 4.5 1.6 1.2 TSSOP-14 1.0 0.8 0.6 1.5 -0.5 -2.5 0.2 -3.5 0 -4.5 -20 0 20 40 60 Input Neg_1Vpp -1.5 0.4 -40 Input Pos_1Vpp 0.5 Output Neg_AV+5 0 80 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Time (µs) Ambient Temperature (°C) Figure 35. Overdrive Recovery 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. 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: 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. ■ Include 6.8µF and 0.1µF ceramic capacitors. Refer to the evaluation board layouts for more information. ■ Place the 6.8µF capacitor within 0.75 inches of the power pin. Evaluation Board Information The following evaluation boards are available to aid in the testing and layout of these devices: ■ Place the 0.1µF capacitor within 0.1 inches of the power pin. Evaluation Board ■ 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. Products KEB022 FHP3194IM14X KEB025 FHP3194IMTC14X ■ 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. © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 13 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer 1.8 FHP3194 4:1 High-Speed Multiplexer Figure 36. KEB022 Top-Side Figure 38. KEB025 Top-Side Figure 37. KEB022 Bottom-Side Figure 39. KEB025 Bottom-Side VCC R1-1 75Ω C1 6.8µF - + IN1 C3 0.1µF - IN2 IN3 R1-3 75Ω C2 6.8µF + + C4 0.1µF + R1-2 75Ω OUT ROUT 75Ω FHP3194 1 NI1 VS+ 14 2 GND1 OUT 13 3 NI2 VINV 12 4 GND2 SD 11 5 NI3 EN 10 6 VEE A1 9 7 NI4 A0 8 RG 475Ω SD R5 50Ω R1-4 A1 EN R3 75Ω VEE PWR RF 475Ω 50Ω IN4 R2 50Ω R4 50Ω 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 42. TSSOP-14 Package © 2006 Fairchild Semiconductor Corporation FHP3194 Rev. 1.0.1 16 www.fairchildsemi.com FHP3194 4:1 High-Speed Multiplexer Rev. I20 www.fairchildsemi.com ©2006 Fairchild Semiconductor Corporation