100 MHz Single Supply Rail to Rail Amplifier Features General Description • Rail to Rail Output Swing The EL5144C series amplifiers are voltage feedback, high speed, rail to rail amplifiers designed to operate on a single +5V supply. They offer unity gain stability with an unloaded –3dB bandwidth of 100 MHz. The input common mode voltage range extends from the negative rail to within 1.5V of the positive rail. Driving a 75Ω double terminated coaxial cable, the EL5144C series amplifiers drive to within 150 mV of either rail. The 200 V/µsec slew rate and 0.1% / 0.1° differential gain / differential phase makes these parts ideal for composite and component video applications. With its voltage feedback architecture, this amplifier can accept reactive feedback networks, allowing them to be used in analog filtering applications These amplifiers will source 90 mA and sink 65 mA. 5V 0V • • • • -3 dB Bandwidth = 100 MHz Single Supply +5V operation Power Down to 2.6 µA Large Input Common Mode Range 0V < VCM < 3.5 V • Diff Gain/Phase = 0.1%/0.1° • Low Power 35mW per amplifier • Space Saving SOT23-5, MSOP8&10, & QSOP-16 packaging Applications • • • • • • • • Video Amplifier 5 Volt Analog Signal Processing Multiplexer Line Driver Portable Computers High Speed Communications Sample & Hold Amplifier Comparator The EL5146C and EL5246C have a power-savings disable feature. Applying a standard TTL low logic level to the CE (Chip Enable) pin reduces the supply current to 2.6 µA within 10 nsec. Turn on time is 500 nsec, allowing true break-before-make conditions for multiplexing applications. Allowing the CE pin to float or applying a high logic level will enable the amplifier. EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C For applications where board space is critical, singles are offered in a SOT23-5 package, duals in MSOP-8 and MSOP-10 packages, and quads in a QSOP-16 package. Singles, duals and quads are also available in industry standard pinouts in SOIC and PDIP packages. All parts operate over the industrial temperature range of -40°C to +85°C. Pin Configurations SOIC-8, PDIP-8 SOT23-5 8 CE NC 1 Ordering Information IN- 2 Package Outline # EL5144CW -40°C to +85°C 5 Pin SOT23 MDP0038 EL5146CN -40°C to +85°C 8 Pin PDIP MDP0031 EL5146CS -40°C to +85°C 8 Pin SOIC MDP0027 EL5244CN -40°C to +85°C 8 Pin PDIP MDP0031 EL5244CS -40°C to +85°C 8 Pin SOIC MDP0027 EL5244CY -40°C to +85°C 8 Pin MSOP MDP0043 EL5246CN -40°C to +85°C 14 Pin PDIP MDP0031 EL5246CS -40°C to +85°C 14 Pin SOIC MDP0027 EL5246CY -40°C to +85°C 10 Pin MSOP MDP0043 EL5444CN -40°C to +85°C 14 Pin PDIP MDP0031 EL5444CS -40°C to +85°C 14 Pin SOIC MDP0027 EL5444CU -40°C to +85°C 16 Pin QSOP MDP0040 GND 2 IN+ 3 IN+ 3 + 7 VS 6 OUT 4 IN5 NC GND 4 EL5144C EL5146C Dual and Quad Amplifier Pin Configurations on Page 12 March 1, 2000 Temp. Range © 1998 Elantec, Inc. 5 VS + Part No OUT 1 EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C 100 MHz Single Supply Rail to Rail Amplifier Absolute Maximum Ratings (T A = 25 °C) Values beyond absolute maximum ratings can cause the device to be prematurely damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. +6V Supply Voltage between VS and GND Maximum Continuous Output Current 50mA Power Dissipation Pin Voltages Storage Temperature Operating Temperature Lead Temperature See Curves GND - 0.5V to VS +0.5V -65°C to +150°C -40°C to +85°C 260°C Important Note: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA. Electrical Characteristics VS=+5V, GND=0V, TA=25°C, CE = +2V, unless otherwise specified. Parameter Description Conditions Min Typ Max Units AC Performance dG Differential Gain Error dP Differential Phase Error BW Bandwidth [1] [1] G=2, RL=150Ω to 2.5V, RF=1KΩ 0.1 % G=2, RL=150Ω to 2.5V, RF=1KΩ 0.1 deg -3dB, G=1, RL=10kΩ, RF=0 100 MHz -3dB, G=1, RL=150Ω, RF=0 60 MHz ±0.1dB, G=1, RL=150Ω to GND, RF=0 8 MHz 60 MHz 200 V/µs 35 ns BW1 Bandwidth GBWP Gain Bandwidth Product SR Slew Rate G=1, RL=150Ω to GND, RF=0, VO=0.5V to 3.5V ts Settling Time to 0.1%, VOUT = 0 to 3V 150 DC Performance AVOL VOS Open Loop Voltage Gain Offset Voltage TCVOS Input Offset Voltage Temperature Coefficient IB Input Bias Current RL=no load, VOUT=0.5V to 3V 54 65 dB RL=150Ω to GND, VOUT=0.5V to 3V 40 50 dB VCM=1V, SOT23-5 and MSOP packages 25 mV VCM=1V, All other packages 15 mV µV/OC 10 VCM=0V & 3.5V 2 100 nA Input Characteristics CMIR Common Mode Input Range CMRR ≥ 47dB 0 CMRR Common Mode Rejection Ratio DC, VCM = 0 to 3.0V 50 DC, VCM = 0 to 3.5V 47 60 dB RIN Input Resistance 1.5 GΩ CIN Input Capacitance 1.5 pF 3.5 60 V dB Output Characteristics VOP VON Positive Output Voltage Swing Negative Output Voltage Swing RL=150Ω to 2.5V [2] 4.70 4.85 V RL=150Ω to GND [2] 4.20 4.65 V RL=1KΩ to 2.5V [2] 4.95 4.97 RL=150Ω to 2.5V [2] 0.15 RL=150Ω to GND [2] 0 RL=1K to 2.5V [2] +IOUT Positive Output Current RL=10Ω to 2.5V 2 60 V 0.30 V V 0.03 0.05 V 90 120 mA 100 MHz Single Supply Rail to Rail Amplifier Electrical Characteristics VS=+5V, GND=0V, TA=25°C, CE = +2V, unless otherwise specified. Parameter -IOUT Description Negative Output Current Conditions RL=10Ω to 2.5V Min Typ Max Units -50 -65 -80 mA Enable (EL5146C & EL5246C Only) tEN Enable Time EL5146C, EL5246C 500 tDIS Disable Time EL5146C, EL5246C 10 IIHCE CE pin Input High Current CE = 5V, EL5146C, EL5246C IILCE CE pin Input Low Current CE = 0V, EL5146C, EL5246C VIHCE CE pin Input High Voltage for Power Up EL5146C, EL5246C VILCE CE pin Input Low Voltage for Power Down EL5146C, EL5246C nS nS 0.003 1 µA -1.2 -3 µA 2.0 V 0.8 V Supply IsON Supply Current - Enabled (per amplifier) No Load, VIN= 0V, CE=5V 7 8.8 mA IsOFF Supply Current - Disabled (per amplifier) No Load, VIN= 0V, CE=0V 2.6 5 µA PSOR Power Supply Operating Range 4.75 5.0 5.25 PSRR Power Supply Rejection Ratio 50 60 DC, VS = 4.75V to 5.25V 1. Standard NTSC test, AC signal amplitude = 286 mVp-p, f=3.58 MHz, VOUT is swept from 0.8V to 3.4V, RL is DC coupled 2. RL is Total Load Resistance due to Feedback Resistor and Load Resistor 3 V dB EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C 100 MHz Single Supply Rail to Rail Amplifier Typical Performance Curves Non-Inverting Frequency Response (Gain) VCM = 1.5V, RL = 150Ω 19 Non-Inverting Frequency Response (Phase) VCM = 1.5V, RL= 150Ω 15 +2 MAGNITUDE (NORMALIZED) (dB) AV = +1, RF = 0Ω AV = +1, RF = 0Ω 0 0 -45 PHASE (°) -2 AV = +2, RF = 1KΩ -4 -90 AV = +2, RF = 1KΩ AV = +5.6, RF = 1KΩ -135 AV = +5.6, RF = 1KΩ -6 -180 -8 1M 10M 100M 1M 10M FREQUENCY (Hz) 0 Inverting Frequency Response (Phase) VCM = 1.5V, RF = 1KΩ, RL= 150Ω 2 AV = -1 180 AV = -1 AV = -2 135 AV = -2 PHASE (°) MAGNITUDE (NORMAILZED) (dB) +2 AV = -5.6 -2 AV = -5.6 90 -4 45 -6 0 1M 10M 100M 1M 10M FREQUENCY (Hz) 3dB Bandwidth vs. Die Temperature for Various Gains RL = 10KΩ 51 100 150 3dB BANDWIDTH (MHz) 80 AV = +1, RF = 0Ω 60 AV = +2, RF = 1KΩ 40 20 0 -55 100M FREQUENCY (Hz) 3dB Bandwidth vs. Die Temperature for Various Gains RL = 150Ω 52 100M FREQUENCY(Hz) Inverting Frequency Response (Gain) VCM = 1.5V, RF = 1KΩ, RL= 150Ω 1 3dB BANDWIDTH (MHz) EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C AV = +5.6, RF = 1KΩ -15 25 65 105 90 DIE TEMPERATURE (°C) AV = +2, RF = 1KΩ 60 30 0 -55 145 AV = +1, RF = 0Ω 120 AV = +5.6, RF = 1KΩ -15 25 65 DIE TEMPERATURE (°C) 4 105 145 100 MHz Single Supply Rail to Rail Amplifier Frequency Response for Various RL VCM = 1.5V, RF = 0Ω, AV = +1 +4 RL= 10KΩ +2 0 RL= 520Ω -2 RL= 150Ω -4 1M Frequency Response for Various CL VCM = 1.5V, RL = 150Ω, AV = +1 17 MAGNITUDE (NORMALIZED) (dB) MAGNITUDE (NORMALIZED) (dB) 16 10M +8 CL= 100pF CL= 47pF +4 0 CL= 22pF CL= 0pF -4 -8 100M 1M 10M FREQUENCY (Hz) Frequency Response for Various RF and RG VCM = 1.5V,RL = 150Ω, AV = +2 18 100M FREQUENCY (Hz) Group Delay vs. Frequency 23 MAGNITUDE (NORMALIZED) (dB) 10 AV = +2 RF = 1KΩ RF = RG = 2KΩ +2 RF = RG = 1KΩ RF = RG = 560Ω -2 8 GROUP DELAY (nsec) 0 -4 6 4 AV = +1 RF = 0Ω 2 -6 1M 10M 0 1M 100M 10M FREQUENCY (Hz) Open Loop Gain and Phase vs. Frequency 80 45 70 Phase 60 90 40 RL = 150Ω 135 PHASE (°) GAIN (dB) 0 RL = 1KΩ 80 20 0 1K Open Loop Voltage Gain vs. Die Temperature 43 180 Gain 100K OPEN LOOP GAIN (dB) 29 100M FREQUENCY (Hz) 60 50 FREQUENCY (Hz) RL=150Ω 40 30 -55 10M No Load -15 25 65 DIE TEMPERATURE (°C) 5 105 145 EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C 100 MHz Single Supply Rail to Rail Amplifier Voltage Noise vs. Frequency 65 200 1K CLOSED LOOP (Z0) VOLTAGE NOISE (nV/√Hz) Closed Loop Output Impedance vs. Frequency RF = 0, AV = +1 26 10K 100 10 20 2 0.2 1 10 1K 100K 10K 10M 100K Offset Voltage vs. Die Temperature (6 Typical Samples) 39 10M 1M 100M FREQUENCY (Hz) FREQUENCY (Hz) PSRR and CMRR vs. Frequency 28 +20 12 PSRR, CMRR (dB) OFFSET VOLTAGE (mV) 0 6 0 -6 CMRR -20 -PSRR +PSRR -40 -60 -12 -80 -55 -15 25 65 105 145 1K Output Voltage Swing vs. Frequency for THD < 1% RF = 1KΩ, AV = +2 21 1M 10M 100M OUTPUT VOLTAGE SWING (VPP) 5 4 RL = 500Ω to 2.5V 3 2 0 1M 100K Output Voltage Swing vs. Frequency for THD < 0.1% RF = 1KΩ, AV = +2 22 5 1 10K FREQUENCY (Hz) DIE TEMPERATURE (°C) OUTPUT VOLTAGE SWING (VPP) EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C RL = 150Ω to 2.5V 10M 4 3 RL = 150Ω to 2.5V 1 0 1M 100M FREQUENCY (Hz) RL = 500Ω to 2.5V 2 10M FREQUENCY (Hz) 6 100M 100 MHz Single Supply Rail to Rail Amplifier Large Signal Pulse Response (Single Supply) VS= +5V, RL = 150Ω to 0V, RF = 1KΩ, AV = +2 62 Small Signal Pulse Response (Single Supply) VS= +5V, RL = 150Ω to 0V, RF = 1KΩ, AV = +2 63 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 4 3 2 1 1.7 1.5 1.3 0 TIME (20ns/DIV) Large Signal Pulse Response (Split Supplies) VS= ±2.5V, RL = 150Ω to 0V, RF = 1KΩ, AV = +2 Small Signal Pulse Response (Split Supply) VS= ±2.5V, RL = 150Ω to 0V, RF = 1KΩ, AV = +2 64 OUTPUT VOLTAGE (V) 61 OUTPUT VOLTAGE (V) TIME (20ns/DIV) +2 0 -2 +0.2 0 -0.2 TIME (20ns/DIV) TIME (20ns/DIV) Settling Time vs. Settling Accuracy RL=1KΩ, RF = 500Ω, AV = -1, VSTEP = 3V 70 48 250 80 SLEW RATE (V/µS) SETTLING TIME (nsec) 100 Slew Rate vs. Die Temperature 60 40 200 20 0 0.01 0.1 150 -55 1.0 -15 25 65 DIE TEMPERATURE (°C) SETTLING ACCURACY (%) 7 105 145 EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C 100 MHz Single Supply Rail to Rail Amplifier Differential Gain for RL Tied to 0V RF = 0, AV = +1 54 +0.2 +0.04 DIFFERENTIAL PHASE (°) DIFFERENTIAL GAIN (%) Differential Phase for RL Tied to 0V RF = 0, AV = +1 53 +0.08 RL = 10KΩ 0 RL = 150Ω -0.04 -0.08 +0.1 RL = 150Ω 0 -0.1 RL = 10KΩ -0.2 0.25 3.25 1.75 0.25 1.75 VOUT (V) +0.2 DIFFERENTIAL PHASE (°) DIFFERENTIAL GAIN (%) Differential Phase for RL Tied to 2.5V RF = 0, AV = +1 55 +0.2 RL = 150Ω +0.1 0 -0.1 RL = 10KΩ +0.1 R RLL ==10KΩ 0 R RL == 150Ω -0.1 -.02 -0.2 0.5 0.5 3.5 2.0 2.0 Differential Gain for RL Tied to 0V RF = 1KΩ, AV = +2 Differential Phase for RL Tied to 0V RF = 1KΩ, AV = +2 34 +0.2 DIFFERENTIAL PHASE (°) +0.2 RL = 150Ω +0.1 RL = 10KΩ 0 -0.1 -0.2 0.5 3.5 VOUT (V) VOUT (V) 32 3.25 VOUT (V) Differential Gain for RL Tied to 2.5V RF = 0, AV = +1 56 DIFFERENTIAL GAIN (%) EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C RL = 150Ω +0.1 RL = 10KΩ 0 -0.1 -0.2 2.0 3.5 0.5 VOUT (V) 2.0 VOUT (V) 8 3.5 100 MHz Single Supply Rail to Rail Amplifier Differential Gain for RL Tied to 2.5V RF = 1KΩ, AV = +2 31 +0.2 +0.1 DIFFERENTIAL PHASE (°) +0.2 DIFFERENTIAL GAIN (%) Differential Phase for RL Tied to 2.5V RF = 1KΩ, AV = +2 33 RL = 150Ω 0 -0.1 RL = 10KΩ RL = 10KΩ +0.1 0 -0.1 RL = 150Ω -0.2 -0.2 0.5 0.5 3.5 2.0 2nd and 3rd Harmonic Distortion vs. Frequency VOUT = 0.25V to 2.25V, RL = 100Ω to 0V 5 3.5 2.0 VOUT (V) VOUT (V) 2nd and 3rd Harmonic Distortion vs.Frequency VOUT = 0.5V to 2.5V, RL = 100Ω to 0V 6 -25 -25 -35 -35 DISTORTION (dBc) DISTORTION (dBc) HD3 HD3 -45 HD2 -55 -65 -45 HD2 -55 -65 -75 1M 10M -75 1M 100M FREQUENCY (Hz) 2nd and 3rd Harmonic Distortion vs. Frequency VOUT = 1V to 3V, RL = 100Ω to 0V 7 0 -20 CROSSTALK (dB) HD3 -35 DISTORTION (dBc) 100M Channel to Channel Crosstalk- Duals and Quads (Worst Channel) 27 -25 -45 HD2 -55 -40 -60 -80 -65 -75 1M 10M FREQUENCY (Hz) 10M -100 100K 100M 1M 10M FREQUENCY (Hz) FREQUENCY (Hz) 9 100M EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C 100 MHz Single Supply Rail to Rail Amplifier Supply Current (per Amp) vs. Supply Voltage 44 Output Current vs. Die Temperature RL = 10Ω to 2.5V 45 120 100 OUTPUT CURRENT (mA) SUPPLY CURRENT (mA) 8 6 4 2 Source 80 60 Sink 40 0 0 1 2 3 4 20 -55 5 -15 SUPPLY VOLTAGE (V) 8 4 SUPPLY CURRENT (µA) SUPPLY CURRENT (mA) 5 7 6 5 -15 25 65 105 105 145 1 0 -55 -15 25 65 DIE TEMPERATURE (°C) Negative Output Voltage Swing vs. Die Temperature 41 5.0 0.5 OUTPUT VOLTAGE (V) RL=150Ω to 2.5V 4.9 4.8 4.7 4.5 -55 145 2 145 Positive Output Voltage Swing vs. Die Temperature RL = 150Ω 4.6 105 3 DIE TEMPERATURE (°C) 69 65 Supply Current - OFF (per amp) vs. Die Temperature 47 9 4 -55 25 DIE TEMPERATURE (°C) Supply Current - ON (per amp) vs. Die Temperature 46 OUTPUT VOLTAGE (V) EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C RL=150Ω to 0V -15 25 65 105 0.4 0.3 0.2 RL=150Ω to 0V 0.1 0 -55 145 RL=150Ω to 2.5V -15 25 65 DIE TEMPERATURE (°C) DIE TEMPERATURE (°C) 10 105 145 100 MHz Single Supply Rail to Rail Amplifier Output Voltage from Either Rail vs. Die Temperature for Various Effective RLOAD 40 -20 300 100 -40 Effective RLOAD = 150Ω MAGNITUDE (dBc) OUTPUT VOLTAGE (mV) OFF Isolation - EL5146C & EL5246C 71 Effective RLOAD = 1KΩ Effective RLOAD = 5KΩ 10 EL 5146CS & EL5146CN -60 EL5246CN EL5246CS -80 -100 Effective R LOAD = RL//RF to VS/2 1 -55 -15 25 65 105 -120 10k 145 100k DIE TEMPERATURE (°C) Maximum Power Dissipation vs. Ambient Temperature Singles (TJMAX = 150°C) 67 PDIP, ΘJA = 110°C/W 1.6 POWER DISSIPATION (W) POWER DISSIPATION (W) 100M 2.5 SOIC, ΘJA = 161°C/W 1.2 0.8 0.4 0 -50 -20 10 40 70 AMBIENT TEMPERATURE (°C) SOIC-14, ΘJA = 120°C/W 1.0 0.5 2.5 PDIP-14, ΘJA = 83°C/W 1.5 1.0 0.5 SOIC-14, ΘJA = 118°C/W QSOP-16, ΘJA = 158°C/W 0 -50 -20 10 40 70 SOIC-8, ΘJA = 159°C/W MSOP-8,10, ΘJA = 206°C/W -20 10 40 70 AMBIENT TEMPERATURE (°C) Maximum Power Dissipation vs. Ambient Temperature Quads (TJMAX = 150°C) 2.0 PDIP-8, ΘJA = 107°C/W 1.5 0 -50 100 PDIP-14, ΘJA = 87°C/W 2.0 SOT23-5, ΘJA = 256°C/W POWER DISSIPATION (W) 10M Maximum Power Dissipation vs. Ambient Temperature Duals (TJMAX = 150°C) 66 2.0 68 1M FREQUENCY (Hz) 100 AMBIENT TEMPERATURE (°C) 11 100 EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C 100 MHz Single Supply Rail to Rail Amplifier Pin Configurations SOIC-14, PDIP-14 INA+ 1 MSOP-10 SOIC-8, PDIP-8, MSOP-8 8 VS CEA 2 7 OUTB GND 3 6 INB+ CEB 4 5 INB+ + - INB+ 5 EL5244C 14 INA+ CEA 3 12 NC 8 VS GND 4 11 VS 7 OUTB CEB 5 10 NC NC 6 6 INBEL5246C + - INB+ 7 QSOP-16 SOIC-14, PDIP-14 1 16 OUTD INA- 2 15 IND- INA+ 3 14 IND+ VS 4 13 GND VS 5 12 GND INB+ 6 11 INC+ INB- 7 OUTB 8 12 IND+ VS 4 11 GND INB+ 5 10 INC+ + - 9 INC- 8 OUTC + - OUTB 7 + 13 IND- INA+ 3 INB- 6 OUTA 14 OUTD + INA- 2 EL5444C Single Amplifier Pin Configurations on Page 1 12 10 INC9 OUTC EL5444C 9 OUTB 8 INB- EL5246C OUTA 1 13 OUTA 9 OUTA + - INA+ 3 GND 4 + + + + - INA- 2 NC 2 10 INA- INA+ 1 OUTA 1 + EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C 100 MHz Single Supply Rail to Rail Amplifier EL5144C (SOT23-5) EL5146C (SO/PDIP) EL5244C (SO/PDIP/MSOP) EL5246C (MSOP) EL5246C (SO/PDIP) EL5444C (SO/PDIP) EL5444C (QSOP) Pin Description 5 7 8 8 11 4 4,5 VS 2 4 4 3 4 11 12,13 GND Ground or Negative Power Supply 3 3 IN+ Noninverting Input Name Function Equivalent Circuit Positive Power Supply VS GND Circuit 1 4 2 IN- 1 6 OUT Inverting Input (Reference Circuit 1) Amplifier Output VS GND Circuit 2 3 1 1 3 3 INA+ Amplifier A Noninverting Input (Reference Circuit 1) 2 10 14 2 1 9 13 1 2 INA- Amplifier A Inverting Input (Reference Circuit 1) 1 OUTA Amplifier A Output 5 5 7 (Reference Circuit 2) 5 6 INB+ Amplifier B Noninverting Input 6 6 8 (Reference Circuit 1) 6 7 INB- Amplifier B Inverting Input (Reference Circuit 1) 7 7 9 (Reference Circuit 2) 7 8 OUTB Amplifier B Output 10 11 INC+ Amplifier C Noninverting Input (Reference Circuit 1) 9 10 INC- Amplifier C Inverting Input (Reference Circuit 1) 8 9 OUTC Amplifier C Output (Reference Circuit 2) 12 14 IND+ Amplifier D Noninverting Input (Reference Circuit 1) Amplifier D Inverting Input (Reference Circuit 1) Amplifier D Output (Reference Circuit 2) 13 15 IND- 14 16 OUTD 13 EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C 100 MHz Single Supply Rail to Rail Amplifier EL5444C (QSOP) EL5444C (SO/PDIP) EL5246C (SO/PDIP) EL5246C (MSOP) EL5244C (SO/PDIP/MSOP) EL5146C (SO/PDIP) Pin Description EL5144C (SOT23-5) EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C Name 8 CE Function Equivalent Circuit Enable (Enabled when high) VS + – GND Circuit 3 1,5 2 3 CEA Enable Amplifier A (Enabled when high) (Reference Circuit 3) 4 5 CEB Enable Amplifier B (Enabled when high) (Reference Circuit 3) 2,6, 10,12 NC No Connect. Not internally connected. 14 1.4V 100 MHz Single Supply Rail to Rail Amplifier Description of Operation and Applications Information Product Description ceramic capacitor from VS to GND will suffice. This same capacitor combination should be placed at each supply pin to ground if split supplies are to be used. In this case, the GND pin becomes the negative supply rail. The EL5144C series is a family of wide bandwidth, single supply, low power, rail-to-rail output, voltage feedback operational amplifiers. The family includes single, dual, and quad configurations. The singles and duals are available with a power down pin to reduce power to 2.6µA typically. All the amplifiers are internally compensated for closed loop feedback gains of +1 or greater. Larger gains are acceptable but bandwidth will be reduced according to the familiar Gain-Bandwidth Product. For good AC performance, parasitic capacitance should be kept to a minimum. Use of wire wound resistors should be avoided because of their additional series inductance. Use of sockets, particularly for the SO package, should be avoided if possible. Sockets add parasitic inductance and capacitance that can result in compromised performance. Connected in voltage follower mode and driving a high impedance load, the EL5144C series has a -3dB bandwidth of 100 MHz. Driving a 150Ω load, they have a -3dB bandwidth of 60 MHz while maintaining a 200 V/µS slew rate. The input common mode voltage range includes ground while the output can swing rail to rail. Input, Output, and Supply Voltage Range The EL5144C series has been designed to operate with a single supply voltage of 5V. Split supplies can be used so long as their total range is 5V. The amplifiers have an input common mode voltage range that includes the negative supply (GND pin) and extends to within 1.5V of the positive supply (VS pin). They are specified over this range. Power Supply Bypassing and Printed Circuit Board Layout As with any high-frequency device, good printed circuit board layout is necessary for optimum performance. Ground plane construction is highly recommended. Lead lengths should be as short as possible. The power supply pin must be well bypassed to reduce the risk of oscillation For normal single supply operation, where the GND pin is connected to the ground plane, a single 4.7 µF tantalum capacitor in parallel with a 0.1 µF The output of the EL5144C series amplifiers can swing rail to rail. As the load resistance becomes lower in value, the ability to drive close to each rail is reduced. However, even with an effective 150 Ω load resistor connected to a voltage halfway between the supply rails, the output will swing to within 150mV of either rail. 15 EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C 100 MHz Single Supply Rail to Rail Amplifier +1. As this combination gets smaller, the bandwidth falls off. Consequently, RF also has a minimum value that should not be exceeded for optimum performance. Figure 1 shows the output of the EL5144C series amplifier swinging rail to rail with RF = 1KΩ, AV = +2 and RL = 1MΩ. Figure 2 is with RL = 150 Ω. For AV = +1, RF = 0 Ω is optimum. For AV = -1 or +2 (noise gain of 2), optimum response is obtained with RF between 300 Ω and 1K Ω. For AV = -4 or +5 (noise gain of 5), keep RF between 300 Ω and 15K Ω. 5V Video Performance For good video signal integrity, an amplifier is required to maintain the same output impedance and the same frequency response as DC levels are changed at the output. This can be difficult when driving a standard video load of 150Ω, because of the change in output current with DC level. A look at the Differential Gain and Differential Phase curves for various supply and loading conditions will help you obtain optimal performance. Curves are provided for AV = +1 and +2, and RL = 150Ω and 10 KΩ tied both to ground as well as 2.5V. As with all video amplifiers, there is a common mode sweet spot for optimum differential gain / differential phase. For example, with AV = +2 and RL = 150Ω tied to 2.5V, and the output common mode voltage kept between 0.8V and 3.2V, dG/dP is a very low 0.1% / 0.1°. This condition corresponds to driving an AC-coupled, double terminated 75Ω coaxial cable. With A V = +1, RL = 150Ω tied to ground, and the video level kept between 0.85V and 2.95V, these amplifiers provide dG/dP perfo rm ance of 0.05 % / 0.20 °. Th is c ond it ion is representative of using the EL5144C series amplifier as a buffer driving a DC coupled, double terminated, 75Ω coaxial cable. Driving high impedance loads, such as signals on computer video cards, gives similar or better dG/dP performance as driving cables. 0V Figure 1 5V 0V Figure 2 Choice of Feedback Resistor, RF These amplifiers are optimized for applications that require a gain of +1. Hence, no feedback resistor is required. However, for gains greater than +1, the feedback resistor forms a pole with the input capacitance. As this pole becomes larger, phase margin is reduced. This causes ringing in the time domain and peaking in the frequency domain. Therefore, R F has some maximum value that should not be exceeded for optimum performance. If a large value of R F must be used, a small capacitor in the few picofarad range in parallel with RF can help to reduce this ringing and peaking at the expense of reducing the bandwidth. Driving Cables and Capacitive Loads The EL5144C series amplifiers can drive 50pF loads in parallel with 150 Ω with 4dB of peaking and 100pF with 7dB of peaking. If less peaking is desired in these applications, a small series resistor (usually between 5 Ω and 50 Ω) can be placed in series with the output to eliminate most peaking. However, this will obviously reduce the gain slightly. If your gain is greater than 1, the gain resistor (RG) can then be chosen to make up for any gain As far as the output stage of the amplifier is concerned, RF + RG appear in parallel with RL for gains other than 16 100 MHz Single Supply Rail to Rail Amplifier loss which may be created by this additional resistor at the output. Another method of reducing peaking is to add a “snubber” circuit at the output. A snubber is a resistor in a series with a capacitor, 150Ω and 100pF being typical values. The advantage of a snubber is that it does not draw DC load current. Power Dissipation With the high output drive capability of the EL5144C series amplifiers, it is possible to exceed the 150°C Absolute Maximum junction temperature under certain load current conditions. Therefore, it is important to calculate the maximum junction temperature for the application to determine if load conditions or package type need to be modified for the amplifier to remain in the safe operating area. When used as a cable driver, double termination is always recommended for reflection-free performance. For those applications, the back-termination series resistor will de-couple the EL5144C series amplifier from the cable and allow extensive capacitive drive. However, other applications may have high capacitive loads without a back-termination resistor. Again, a small series resistor at the output can reduce peaking. The maximum power dissipation allowed in a package is determined according to: Disable / Power-Down T JMAX – T AMAX PD MAX = ---------------------------------------------Θ JA The EL5146C and EL5246C amplifiers can be disabled, placing its output in a high-impedance state. Turn off time is only 10 nsec and turn on time is around 500 nsec. When disabled, the amplifier’s supply current is reduced to 2.6µA typically, thereby effectively eliminating power consumption. The amplifier’s power down can be controlled by standard TTL or CMOS signal levels at the CE pin. The applied logic signal is relative to the GND pin. Letting the CE pin float will enable the amplifier. Hence, the 8 pin PDIP and SOIC single amps are pin compatible with standard amplifiers that don’t have a power down feature. where: TJMAX = Maximum Junction Temperature TAMAX = Maximum Ambient Temperature θJA = Thermal Resistance of the Package PDMAX = Maximum Power Dissipation in the Package. The maximum power dissipation actually produced by an IC is the total quiescent supply current times the total power supply voltage, plus the power in the IC due to the load, or: Short Circuit Current Limit The EL5144C series amplifiers do not have internal short circuit protection circuitry. Short circuit current of 90 mA sourcing and 65 mA sinking typically will flow if the output is trying to drive high or low but is shorted to half way between the rails. If an output is shorted indefinitely, the power dissipation could easily increase such that the part will be destroyed. Maximum reliability is maintained if the output current never exceeds ±50mA. This limit is set by internal metal interconnect limitations. Obviously, short circuit conditions must not remain or the internal metal connections will be destroyed. V OUT PD MAX = N • V S • I SMAX + ( V S – V OUT ) • ---------------- RL where: N = Number of amplifiers in the package VS = Total Supply Voltage 17 EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C 100 MHz Single Supply Rail to Rail Amplifier ISMAX = Maximum Supply Current Per Amplifier ure 4 is a graph of propagation delay vs. overdrive as a square wave is presented at the input of the comparator. VOUT = Maximum Output Voltage of the Application RL = Load Resistance tied to Ground +5V 1 8 EL5146C If we set the two PDMAX equations equal to each other, we can solve for RL: VIN + – 2 3 0.1µF 7 + VOUT 6 +2.5V RL 4 5 Figure 3 V OUT • ( V S – V OUT ) R L = --------------------------------------------------------------------------------------------- T JMAX – T AMAX ---------------------------------------------- – ( V S • I SMAX ) N • Θ JA 8 Propagation Delay vs. Overdrive for Amplifier Used as a Comparator 1000 Assuming worst case conditions of TA = +85°C, Vout = VS/2 V, VS = 5.5V, and ISMAX = 8.8mA per amplifier, below is a table of all packages and the minimum RL allowed. Part Package Minimum RL EL5144CW SOT23-5 37 EL5146CS SOIC-8 21 EL5146CN PDIP-8 14 EL5244CS SOIC-8 48 EL5244CN PDIP-8 30 EL5244CY MSOP-8 69 EL5246CY MSOP-10 69 34 EL5246CS SOIC-14 EL5246CN PDIP-14 23 EL5444CU QSOP-16 139 EL5444CS SOIC-14 85 EL5444CN PDIP-14 51 PROPAGATION DELAY(nsec) EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C Negative Going Signal 100 Positive Going Signal 10 0.01 0.1 1.0 OVERDRIVE (V) Figure 4 Multiplexing with the EL5144C Series Amplifier Besides normal power down usage, the CE (Chip Enable) pin on the EL5146C and EL5246C series amplifiers also allow for multiplexing applications. Figure 5 shows an EL5246C with its outputs tied together, driving a back terminated 75Ω video load. A 3 Vp-p 10 MHz sine wave is applied at Amp A input, and a 2.4 Vp-p 5 MHz square wave to Amp B. Figure 6 shows the SELECT signal that is applied, and the resulting output waveform at VOUT . Observe the break-before-make operation of the multiplexing. Amp A is on and VIN1 is being passed through to the output of the amplifier. Then Amp A turns off in about 10 nsec. The output decays to EL5144C Series Comparator Application The EL5144C series amplifier can be used as a very fast, single supply comparator. Most op amps used as a comparator allow only slow speed operation because of output saturation issues. The EL5144C series amplifier doesn’t suffer from output saturation issues. Figure 3 shows the amplifier implemented as a comparator. Fig- 18 100 MHz Single Supply Rail to Rail Amplifier ground with an RL CL time constants. 500 nsec later, Amp B turns on and VIN2 is passed through to the output. This break-before-make operation ensures that more than one amplifier isn’t trying to drive the bus at the same time. Notice the outputs are tied directly together. Isolation resistors at each output are not necessary. VIN 1 3V PP 10MHz 1 2 Free Running Oscillator Application Figure 7 is an EL5144C configured as a free running oscillator. To first order, ROSC and COSC determine the frequency of oscillation according to: 0.72 F OSC = -----------------------------------R OSC • C 14 OSC VOUT + 13 3 12 EL5246C For rail to rail output swings, maximum frequency of oscillation is around 15 MHz. If reduced output swings are acceptable, 25 MHz can be achieved. Figure 8 shows the oscillator for ROSC = 510 Ω, COSC = 240 pF and FOSC = 6 MHz. +5V 4 11 5 10 Select 6 VIN 2 2.4V PP 5MHz + - 4.7µF 0.1µF 9 150Ω 7 8 470K +5V Figure 5 1 5 470K 3 ROSC 4 470K COSC VOUT Figure 7 0V 5V Select 0V 5V Figure 6 VOUT 0V Figure 8 19 0.1µF + 2 5V EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C EL5144C, EL5146C, EL5244C, EL5246C, EL5444C 100 MHz Single Supply Rail to Rail Amplifier General Disclaimer Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes in the circuitry or specifications contained herein at any time without notice. Elantec, Inc. assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. WARNING - Life Support Policy Elantec, Inc. products are not authorized for and should not be used within Life Support Systems without the specific written consent of Elantec, Inc. Life Support systems are equipment intended to support or sustain life and whose failure to perform when properly used in accordance with instructions provided can be reasonably expected to result in significant personal injury or death. Users contemplating application of Elantec, Inc. Products in Life Support Systems are requested to contact Elantec, Inc. factory headquarters to establish suitable terms & conditions for these applications. Elantec, Inc.’s warranty is limited to replacement of defective components and does not cover injury to persons or property or other consequential damages. March 1, 2000 Elantec Semiconductor, Inc. 675 Trade Zone Blvd. Milpitas, CA 95035 Telephone: (408) 945-1323 Fax: (408) 945-9305 Toll Free: 1 - (888) ELANTEC Web Site: http://www.elantec.com European Office: 44-118-977-6020 Japan Tech Center: 81-45-682-5820 20 Printed in U.S.A.