CLC1001ISO8X

Data Sheet Comlinear CLC1001 ® Ultra-Low Noise Amplifier The COMLINEAR CLC1001(single) is a high-performance, voltage feedback amplifier with ultra-low input voltage noise, 0.6nV/√Hz. The CLC1001 provides 2.1GHz gain bandwidth product and 410V/μs slew rate making it well suited for high-speed data acquisition systems requiring high levels of sensitivity and signal integrity. This COMLINEAR high-performance amplifier also offers low input offset voltage. The COMLINEAR CLC1001 is designed to operate from 4V to 12V supplies. It consumes only 12.5mA of supply current per channel and offers a power saving disable pin that disables the amplifier and decreases the supply current to below 225μA. The CLC1001 amplifier operates over the extended temperature range of -40°C to +125°C. APPLICATIONS n Transimpedance amplifiers n Pre-amplifier n Low noise signal processing n Medical instrumentation n Probe equipment n Test equipment n Ultrasound channel amplifier If a lower minimum stable gain is required, the CLC1002 offers a minimum stable gain of 5. Typical Application - Single Supply Photodiode Amplifier Comlinear CLC1001 Ultra-Low Noise Amplifier General Description FEATURES n 0.6 nV/√Hz input voltage noise n 1mV maximum input offset voltage n 2.1GHz gain bandwidth product n Minimum stable gain of 10 n 410V/μs slew rate n 130mA output current n -40°C to +125°C operating temperature range n Fully specified at 5V and ±5V supplies n CLC1001: Lead-free SOT23-6, SOIC-8 Rev 1G Ordering Information Part Number Package Pb-Free RoHS Compliant Operating Temperature Range Packaging Method CLC1001IST6X SOT23-6 Yes Yes -40°C to +125°C Reel CLC1001ISO8X SOIC-8 Yes Yes -40°C to +125°C Reel CLC1001ISO8 SOIC-8 Yes Yes -40°C to +125°C Rail Moisture sensitivity level for all parts is MSL-1. Exar Corporation 48720 Kato Road, Fremont CA 94538, USA www.exar.com Tel. +1 510 668-7000 - Fax. +1 510 668-7001 Data Sheet SOT23 Pin Assignments SOT23 Pin Configuration 1 -V S 2 +IN 3 + - 6 +VS 5 DIS -IN 4 Pin Name Description 1 OUT Output 2 -VS Negative supply 3 +IN Positive input 4 -IN Negative input 5 DIS Disable. Enabled if pin is left floating or pulled above VON, disabled if pin is grounded or pulled below VOFF. 6 +VS Positive supply SOIC Pin Assignments SOIC Pin Configuration Pin No. Pin Name Description 1 NC No connect NC 1 8 DIS 2 -IN1 Negative input +IN1 Positive input 2 7 +VS 3 -IN1 4 -VS Negative supply NC No connect +IN1 3 6 OUT 5 -V S OUT Output 5 NC 6 4 7 +VS Positive supply 8 DIS Disable. Enabled if pin is left floating or pulled above VON, disabled if pin is grounded or pulled below VOFF. Comlinear CLC1001 Ultra-Low Noise Amplifier OUT Pin No. Rev 1G ©2007-2013 Exar Corporation 2/17 Rev 1G Data Sheet Absolute Maximum Ratings The safety of the device is not guaranteed when it is operated above the “Absolute Maximum Ratings”. The device should not be operated at these “absolute” limits. Adhere to the “Recommended Operating Conditions” for proper device function. The information contained in the Electrical Characteristics tables and Typical Performance plots reflect the operating conditions noted on the tables and plots. Supply Voltage Input Voltage Range Min Max Unit 0 -Vs -0.5V 14 +Vs +0.5V V V Comlinear CLC1001 Ultra-Low Noise Amplifier Parameter Reliability Information Parameter Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10s) Package Thermal Resistance 6-Lead SOT23 8-Lead SOIC Min Typ -65 Max Unit 150 150 260 °C °C °C 177 100 °C/W °C/W Notes: Package thermal resistance (qJA), JDEC standard, multi-layer test boards, still air. ESD Protection Product SOT23-6 Human Body Model (HBM) Charged Device Model (CDM) 2kV 2kV Rev 1G Recommended Operating Conditions Parameter Min Operating Temperature Range Supply Voltage Range -40 4 ©2007-2013 Exar Corporation 3/17 Typ Max Unit +125 12 °C V Rev 1G Data Sheet Electrical Characteristics at +5V TA = 25°C, Vs = +5V, Rf = 200Ω, RL = 500Ω to VS/2, G = 10; unless otherwise noted. Symbol Parameter Conditions Min Typ Max Units Frequency Domain Response -3dB Gain Bandwidth Product G = +40, VOUT = 0.2Vpp 2000 MHz BWSS -3dB Bandwidth G = +10, VOUT = 0.2Vpp 265 MHz BWLS Large Signal Bandwidth G = +10, VOUT = 2Vpp 105 MHz BW0.1dBSS 0.1dB Gain Flatness Small Signal G = +10, VOUT = 0.2Vpp 37 MHz BW0.1dBLS 0.1dB Gain Flatness Large Signal G = +10, VOUT = 2Vpp 36 MHz Time Domain Response tR, tF Rise and Fall Time VOUT = 1V step; (10% to 90%) 2.4 ns tS Settling Time to 0.1% VOUT = 1V step 11 ns OS Overshoot VOUT = 1V step 6 % SR Slew Rate 4V step 360 V/µs Distortion/Noise Response HD2 2nd Harmonic Distortion 1Vpp, 10MHz -80 dBc HD3 3rd Harmonic Distortion 1Vpp, 10MHz -83 dBc THD Total Harmonic Distortion 1Vpp, 10MHz -79 dB en Input Voltage Noise > 100kHz 0.6 nV/√Hz in Input Current Noise > 100kHz 4.2 pA/√Hz DC Performance Input Offset Voltage 0.1 mV dVIO Average Drift 2.7 µV/°C Ib Input Bias Current 28 µA dIb Average Drift 45 nA/°C Io Input Offset Current 0.5 µA PSRR Power Supply Rejection Ratio DC 83 dB AOL Open-Loop Gain VOUT = VS / 2 82 dB IS Supply Current per channel 12 mA 1V step, 1% settling 100 ns 900 ns Disable Characteristics tON Turn On Time tOFF Turn Off Time OFFISO Off Isolation OFFCOUT Off Output Capacitance VOFF Power Down Voltage VON ISD 2Vpp, 5MHz 80 dB 5.7 pF Disabled if DIS pin is grounded or pulled below VOFF Disabled if DIS < 1.5 V Enable Voltage Enabled if DIS pin is floating or pulled above VON Enabled if DIS > 3 V Disable Supply Current No Load, DIS pin tied to ground 130 µA Non-inverting 2.6 MΩ 1.6 pF 0.8 to 5.1 V 85 dB RL = 500Ω 0.93 to 4 V RL = 2kΩ 0.9 to 4.1 V ±130 mA ±150 mA Input Characteristics RIN Input Resistance CIN Input Capacitance CMIR Common Mode Input Range CMRR Common Mode Rejection Ratio DC , Vcm=1.5V to 4V Output Characteristics VOUT Output Voltage Swing IOUT Output Current ISC Short-Circuit Output Current VOUT = VS / 2 Notes: 1. 100% tested at 25°C ©2007-2013 Exar Corporation 4/17 Rev 1G Rev 1G VIO Comlinear CLC1001 Ultra-Low Noise Amplifier GBWP Data Sheet Electrical Characteristics at ±5V TA = 25°C, Vs = ±5V, Rf = 200Ω, RL = 500Ω , G = 10; unless otherwise noted. Symbol Parameter Conditions Min Typ Max Units Frequency Domain Response -3dB Gain Bandwidth Product G = +40, VOUT = 0.2Vpp 2100 MHz BWSS -3dB Bandwidth G = +10, VOUT = 0.2Vpp 284 MHz BWLS Large Signal Bandwidth G = +10, VOUT = 2Vpp 117 MHz BW0.1dBSS 0.1dB Gain Flatness Small Signal G = +10, VOUT = 0.2Vpp 42 MHz BW0.1dBLS 0.1dB Gain Flatness Large Signal G = +10, VOUT = 2Vpp 47 MHz Time Domain Response tR, tF Rise and Fall Time VOUT = 1V step; (10% to 90%) 2.2 ns tS Settling Time to 0.1% VOUT = 1V step 11 ns OS Overshoot VOUT = 1V step 3 % SR Slew Rate 4V step 410 V/µs Distortion/Noise Response HD2 2nd Harmonic Distortion 2Vpp, 10MHz -81 dBc HD3 3rd Harmonic Distortion 2Vpp, 10MHz -75 dBc THD Total Harmonic Distortion 2Vpp, 5MHz -74 dB en Input Voltage Noise > 100kHz 0.6 nV/√Hz in Input Current Noise > 100kHz 4.2 pA/√Hz DC Performance VIO dVIO Ib Input Offset Voltage(1) -1 0.35 Average Drift 1 4.4 Input Bias Current (1) -60 30 mV µV/°C 60 44 µA Average Drift Io Input Offset Current PSRR Power Supply Rejection Ratio DC 78 83 AOL Open-Loop Gain (1) VOUT = VS / 2 74 83 IS Supply Current (1) per channel 12.5 1V step, 1% settling 125 ns 840 ns nA/°C 0.8 (1) 6 µA dB dB 16 mA Disable Characteristics tON Turn On Time tOFF Turn Off Time OFFISO Off Isolation OFFCOUT Off Output Capacitance VOFF Power Down Voltage VON ISD 2Vpp, 5MHz 80 dB 5.6 pF Disabled if DIS pin is grounded or pulled below VOFF Disabled if DIS < 1.3 V Enable Voltage Enabled if DIS pin is floating or pulled above VON Enabled if DIS > 3 Disable Supply Current (1) No Load, DIS pin tied to ground 180 V 225 µA Input Characteristics RIN Input Resistance CIN Input Capacitance CMIR Common Mode Input Range CMRR Common Mode Rejection Ratio (1) Non-inverting DC , Vcm=-3.5V to 4V 4 MΩ 1.5 pF -4.3 to 5.1 V 75 90 dB -3.8 ±4 Output Characteristics VOUT Output Voltage Swing IOUT Output Current ISC Short-Circuit Output Current RL = 500Ω (1) RL = 2kΩ VOUT = VS / 2 3.8 V ±4 V ±130 mA ±160 mA Notes: 1. 100% tested at 25°C ©2007-2013 Exar Corporation 5/17 Rev 1G Rev 1G dIb Comlinear CLC1001 Ultra-Low Noise Amplifier GBWP Data Sheet Typical Performance Characteristics TA = 25°C, Vs = ±5V, Rf = 200Ω, RL = 500Ω, G = 10; unless otherwise noted. Non-Inverting Frequency Response Inverting Frequency Response Normalized Gain (dB) Normalized Gain (dB) 3 0 G = +10 G = +20 -3 G = +40 -6 0 G = -10 -3 G = -20 G = -40 -6 VOUT = 0.2Vpp VOUT = 0.2Vpp -9 -9 0.1 1 10 100 1000 0.1 1 10 Frequency (MHz) 100 1000 Frequency (MHz) Frequency Response vs. CL Frequency Response vs. RL 3 3 Normalized Gain (dB) 0 CL = 100pF Rs = 13Ω -3 CL = 47pF Rs = 20Ω CL = 22pF Rs = 33Ω -6 VOUT = 0.2Vpp 0 Rl = 1K Rl = 2K -3 Rl = 5K Rev 1G Normalized Gain (dB) CL = 470pF Rs = 4.3Ω -6 CL = 10pF Rs = 43Ω VOUT = 0.2Vpp -9 -9 0.1 1 10 100 1000 0.1 1 Frequency (MHz) 100 1000 -3dB Bandwidth vs. Output Voltage 1 300 0 250 -1 -3dB Bandwidth (MHz) Normalized Gain (dB) 10 Frequency (MHz) Frequency Response vs. VOUT VOUT = 4Vpp -2 VOUT = 3Vpp -3 VOUT = 2Vpp -4 -5 200 150 100 50 -6 0 -7 0.1 1 10 100 0.0 1000 ©2007-2013 Exar Corporation 1.0 2.0 3.0 4.0 VOUT (VPP) Frequency (MHz) 6/17 Comlinear CLC1001 Ultra-Low Noise Amplifier 3 Rev 1G Data Sheet Typical Performance Characteristics TA = 25°C, Vs = ±5V, Rf = 200Ω, RL = 500Ω, G = 10; unless otherwise noted. Non-Inverting Frequency Response at VS = 5V Inverting Frequency Response at VS = 5V Normalized Gain (dB) Normalized Gain (dB) 3 0 G = +10 -3 G = +20 G = +40 -6 0 G = -10 -3 G = -20 G = -40 -6 VOUT = 0.2Vpp VOUT = 0.2Vpp -9 -9 0.1 1 10 100 1000 0.1 1 Frequency (MHz) 10 100 1000 Frequency (MHz) Frequency Response vs. CL at VS = 5V Frequency Response vs. RL at VS = 5V 3 3 Normalized Gain (dB) 0 CL = 100pF Rs = 15Ω -3 CL = 47pF Rs = 22Ω CL = 22pF Rs = 36Ω -6 VOUT = 0.2Vpp 0 Rl = 1K Rl = 2K -3 Rl = 5K Rev 1G Normalized Gain (dB) CL = 470pF Rs = 5Ω -6 CL = 10pF Rs = 50Ω VOUT = 0.2Vpp -9 -9 0.1 1 10 100 1000 0.1 1 Frequency (MHz) 100 1000 -3dB Bandwidth vs. Output Voltage at VS = 5V 1 300 0 250 -1 -3dB Bandwidth (MHz) Normalized Gain (dB) 10 Frequency (MHz) Frequency Response vs. VOUT at VS = 5V VOUT = 2Vpp -2 VOUT = 1.5Vpp -3 VOUT = 1Vpp -4 -5 200 150 100 50 -6 -7 0 0.1 1 10 100 1000 0.0 Frequency (MHz) ©2007-2013 Exar Corporation 0.5 1.0 1.5 2.0 VOUT (VPP) 7/17 Comlinear CLC1001 Ultra-Low Noise Amplifier 3 Rev 1G Data Sheet Typical Performance Characteristics - Continued TA = 25°C, Vs = ±5V, Rf = 200Ω, RL = 500Ω, G = 10; unless otherwise noted. Input Voltage Noise at VS = 5V 2.6 2.4 2.4 2.2 2.2 Input Voltage Noise (nV/√Hz) 2.6 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0.2 0 0 0.0001 0.001 0.01 0.1 1 10 0.0001 0.001 0.01 Input Voltage Noise (>10kHz) 1 10 Input Voltage Noise at VS = 5V (>10kHz) 0.85 0.8 0.8 Input Voltage Noise (nV/√Hz) 0.85 0.75 0.7 0.65 0.6 0.55 0.75 0.7 0.65 Rev 1G Input Voltage Noise (nV/√Hz) 0.1 Frequency (MHz) Frequency (MHz) 0.6 0.55 0.5 0.5 0.01 0.1 10 10 1 0.01 0.1 1 10 10 Frequency (MHz) Frequency (MHz) ROUT vs. Frequency ROUT (Ω) 10 1 0.1 0.01 0.001 0.01 0.1 1 10 100 Frequency (MHz) ©2007-2013 Exar Corporation 8/17 Comlinear CLC1001 Ultra-Low Noise Amplifier Input Voltage Noise (nV/√Hz) Input Voltage Noise Rev 1G Data Sheet Typical Performance Characteristics - Continued TA = 25°C, Vs = ±5V, Rf = 200Ω, RL = 500Ω, G = 10; unless otherwise noted. 2nd Harmonic Distortion vs. RL 3rd Harmonic Distortion vs. RL -65 -75 RL = 500Ω Distortion (dBc) Distortion (dBc) -75 -85 -95 RL = 1kΩ -105 RL = 500Ω -85 -95 RL = 1kΩ -105 VOUT = 1Vpp VOUT = 1Vpp -115 -115 5 10 15 20 5 10 Frequency (MHz) 2nd Harmonic Distortion vs. VOUT -55 -60 20MHz -70 20MHz -65 10MHz -75 10MHz Distortion (dBc) -70 -80 -85 5MHz -90 -95 -75 -80 -85 -90 Rev 1G Distortion (dBc) 20 3rd Harmonic Distortion vs. VOUT -65 5MHz -95 -100 -100 RL = 500Ω -105 0.5 RL = 500Ω -105 0.75 1 1.25 1.5 1.75 2 2.25 2.5 0.5 0.75 Output Amplitude (Vpp) 1 1.25 1.5 1.75 2 2.25 2.5 Output Amplitude (Vpp) 2nd Harmonic Distortion vs. Gain 3rd Harmonic Distortion vs. Gain -50 -50 -55 -55 -60 -60 AV+40 -65 Distortion (dBc) -65 Distortion (dBc) 15 Frequency (MHz) AV+20 -70 -75 -80 -85 -90 5 AV+20 -75 -80 -85 RL = 500Ω -100 10 15 20 5 Frequency (MHz) ©2007-2013 Exar Corporation AV+10 VOUT = 1VPP -95 RL = 500Ω -100 AV+40 -70 -90 AV+10 VOUT = 1VPP -95 Comlinear CLC1001 Ultra-Low Noise Amplifier -65 10 15 20 Frequency (MHz) 9/17 Rev 1G Data Sheet Typical Performance Characteristics - Continued TA = 25°C, Vs = ±5V, Rf = 200Ω, RL = 500Ω, G = 10; unless otherwise noted. 2nd Harmonic Distortion vs. RL at VS = 5V 3rd Harmonic Distortion vs. RL at VS = 5V -65 RL = 500Ω RL = 500Ω -75 Distortion (dBc) Distortion (dBc) -75 -85 -95 RL = 1kΩ -105 -85 -95 RL = 1kΩ -105 VOUT = 1Vpp VOUT = 1Vpp -115 -115 5 10 15 20 5 10 Frequency (MHz) 2nd Harmonic Distortion vs. VOUT at VS = 5V -55 -60 -60 20MHz -65 -65 Distortion (dBc) -70 -70 20MHz -75 -80 -85 5MHz 0.5 -85 10MHz -90 -100 RL = 500Ω -95 -80 RL = 500Ω -105 0.75 1 1.25 1.5 1.75 5MHz -95 10MHz -90 -75 Rev 1G Distortion (dBc) 20 3rd Harmonic Distortion vs. VOUT at VS = 5V -55 2 2.25 2.5 0.5 0.75 Output Amplitude (Vpp) 1 1.25 1.5 1.75 2 2.25 2.5 Output Amplitude (Vpp) 2nd Harmonic Distortion vs. Gain at VS = 5V 3rd Harmonic Distortion vs. Gain at VS = 5V -50 -50 -55 -55 AV+40 -60 -60 AV+20 -65 Distortion (dBc) -65 Distortion (dBc) 15 Frequency (MHz) -70 -75 -80 -85 AV+10 -70 AV+20 -75 -80 -85 AV+10 -90 -90 VOUT = 1VPP -95 -100 5 AV+40 VOUT = 1VPP -95 RL = 500Ω RL = 500Ω -100 10 15 5 20 ©2007-2013 Exar Corporation 10 15 20 Frequency (MHz) Frequency (MHz) 10/17 Comlinear CLC1001 Ultra-Low Noise Amplifier -65 Rev 1G Data Sheet Typical Performance Characteristics - Continued TA = 25°C, Vs = ±5V, Rf = 200Ω, RL = 500Ω, G = 10; unless otherwise noted. Small Signal Pulse Response Small Signal Pulse Response at VS = 5V 2.6 0.05 2.55 Voltage (V) 0.1 Voltage (V) 2.65 0 2.5 -0.05 2.45 -0.1 2.4 -0.15 2.35 0 50 100 150 200 0 50 100 Large Signal Pulse Response 200 Large Signal Pulse Response at VS = 5V 3 4 2 3.5 1 3 Voltage (V) Voltage (V) 150 Time (ns) Time (ns) 0 2.5 2 -2 1.5 -3 Rev 1G -1 1 0 50 100 150 200 0 50 100 Time (ns) 150 200 Time (ns) Enable Response Disable Response 5.5 1.5 5.5 1.5 Disable Enable 4.5 4.5 1.5 Disable Voltage (V) 0.5 Output 3.5 Output 2.5 0.5 1.5 0 Output Voltage (V) 2.5 1 Output Voltage (V) Enable Voltage (V) 1 3.5 0 0.5 0.5 -0.5 -0.5 -50 0 50 100 150 -0.5 200 -100 Time (ns) ©2007-2013 Exar Corporation -0.5 0 100 200 300 400 500 600 700 800 900 Time (ns) 11/17 Comlinear CLC1001 Ultra-Low Noise Amplifier 0.15 Rev 1G Data Sheet Typical Performance Characteristics - Continued TA = 25°C, Vs = ±5V, Rf = 200Ω, RL = 500Ω, G = 10; unless otherwise noted. Enable Response at VS = 5V Disable Response at VS = 5V 1.5 5.5 Enable 4.5 1.5 Disable 4.5 0.5 1.5 Disable Voltage (V) Output 2.5 1 3.5 Output 2.5 0.5 1.5 0 0 0.5 0.5 -0.5 -0.5 -50 0 50 100 150 -0.5 200 -0.5 -100 0 100 Time (ns) 300 400 500 600 700 800 900 Off Isolation at VS = 5V -45 -50 -50 -55 -55 -60 -60 Off Isolation (dB) -45 -65 -70 -75 -80 -85 -65 -70 -75 -80 Rev 1G Off Isolation (dB) 200 Time (ns) Off Isolation -85 -90 -90 -95 -95 VOUT = 2Vpp -100 VOUT = 2Vpp -100 1 10 100 1 10 Frequency (MHz) PSRR vs. Frequency 100 80 80 60 60 PSRR (dB) 100 40 20 40 20 0 0.001 100 Frequency (MHz) CMRR vs. Frequency CMRR (dB) Output Voltage (V) 3.5 Output Voltage (V) Enable Voltage (V) 1 0 0.01 0.1 1 10 100 0.001 Frequency (MHz) ©2007-2013 Exar Corporation 0.01 0.1 1 10 100 Frequency (MHz) 12/17 Comlinear CLC1001 Ultra-Low Noise Amplifier 5.5 Rev 1G Data Sheet Application Information total input voltage noise (amp+resistors) versus Rf and Rg. As the value of Rf increases, the total input referred noise also increases. +Vs Input 6.8μF 0.1μF + Rg G = +41 1.5 1.25 1 0.5 100 1000 Figure 3: Input Referred Voltage Noise vs. Rf and Rg 6.8μF G = 1 + (Rf/Rg) The noise caused by a resistor is modeled with either a voltage source in series with the resistance: 4kTR 6.8μF Or a current source in parallel with it: 0.1μF Output 0.1μF 6.8μF -Vs iR = RL Rf G = - (Rf/Rg) For optimum input offset voltage set R1 = Rf || Rg Figure 2. Typical Inverting Gain Circuit Achieving Low Noise in an Application Making full use of the low noise of the CLC1001 requires careful consideration of resistor values. The feedback and gain set resistors (Rf and Rg) and the non-inverting source impedance (Rsource) all contribute noise to the circuit and can easily dominate the overall noise if their values are too high. The datasheet is specified with an Rg of 22.1Ω, at which point the noise from Rf and Rg is about equal to the noise from the CLC1001. Lower value resistors could be used at the expense of more distortion. Figure 3 shows ©2007-2013 Exar Corporation Rev 1G Rg G = +21 Rf (Ohms) Figure 1. Typical Non-Inverting Gain Circuit Input 2 1.75 Rf -Vs + G = +11 2.25 0.75 RL 0.1μF R1 2.5 Output - +Vs 2.75 4kT R Op amp noise is modeled with three noise sources, en, in and ii. These three sources are analogous to the DC input voltage and current errors Vos, Ibn and Ibi. The noise models must be analyzed in-circuit to determine the effect on the op amp output noise. Since noise is statistical in nature rather than a continuous signal, the set of noise sources in circuit add in an RMS (root mean square) fashion rather than in a linear fashion. For uncorrelated noise sources, this means you add the squares of the noise voltages. A typical non-inverting application (see figure 1) results in the following noise at the output of the op amp: 13/17 Comlinear CLC1001 Ultra-Low Noise Amplifier Figures 1 and 2 illustrate typical circuit configurations for non-inverting, inverting, and unity gain topologies for dual supply applications. They show the recommended bypass capacitor values and overall closed loop gain equations. Input Referred Noise (nV/rtHz) Basic Operation Rev 1G Data Sheet e2o = en2 1+ Rf Rg 2 + in2Rs 2 1+ Rf Rg 2 + ii2R2f The effective load resistor (Rloadeff) will need to include the effect of the feedback network. For instance, op amp noise terms en , in and ii Rloadeff in figure 3 would be calculated as: op amp noise terms en, in and ii RL || (Rf + Rg) Rf 2 e2Rg Rf 2 e2Rf available. Where TAmbient is the temperature of the working environment. PD = Psupply - Pload Supply power is calculated by the standard power equation. Psupply = Vsupply × IRMS supply Maximum Power Dissipation (W) In order to determine PD, the power dissipated in the load needs to be subtracted from the total power delivered by the supplies. 2.5 Vsupply = VS+ - VS- SOIC-8 1.5 SOT23-6 1 0.5 0 -40 Power delivered to a purely resistive load is: -20 0 20 40 60 80 100 120 Ambient Temperature (°C) Pload = ((VLOAD)RMS2)/Rloadeff ©2007-2013 Exar Corporation 2 Figure 4. Maximum Power Derating 14/17 Rev 1G Rev 1G TJunction = TAmbient + (ӨJA × PD) Comlinear CLC1001 Ultra-Low Noise Amplifier These measurements are basic and are relatively easy to with lab equipment. For design purposes + external resistor noiseperform terms for Rs,standard Rg and Rf + 1+ + Rg Rg however, prior knowledge of actual signal levels and load impedance is needed to determine the dissipated power. external resistor noise terms for RS, Rg and Rf Here, PD can be found from High source impedances are sometimes unavoidable, but PD = PQuiescent + PDynamic - PLoad they increase noise from the source impedance and also make the circuit more sensitive to the op amp current noise. Analyze all noise sources in the circuit, not just the Quiescent power can be derived from the specified IS op amp itself, to achieve low noise in your application. values along with known supply voltage, VSupply. Load power can be calculated as above with the desired signal amplitudes using: Power Dissipation (VLOAD)RMS = VPEAK / √2 Power dissipation should not be a factor when operating ( ILOAD)RMS = ( VLOAD)RMS / Rloadeff under the stated 500Ω load condition. However, applications with low impedance, DC coupled loads should be analyzed to ensure that maximum allowed The dynamic power is focused primarily within the output junction temperature is not exceeded. Guidelines listed stage driving the load. This value can be calculated as: below can be used to verify that the particular application will not cause the device to operate beyond it’s intended PDYNAMIC = (VS+ - VLOAD)RMS × ( ILOAD)RMS operating range. Assuming the load is referenced in the middle of the Maximum power levels are set by the absolute maximum power rails or Vsupply/2. junction rating of 150°C. To calculate the junction temperature, the package thermal resistance value ThetaJA (ӨJA) is used along with the total die power Figure 4 shows the maximum safe power dissipation in the dissipation. package vs. the ambient temperature for the packages 2 eRs Data Sheet Driving Capacitive Loads 3 + Input Voltage (V) 1 2 Output 0 0 Input -1 -2 -4 Output CL Rf 4 -2 Rs - 2 -3 RL -6 0 50 100 150 200 250 300 350 400 450 Time (us) Rg Figure 6. Overdrive Recovery Figure 5. Addition of RS for Driving Capacitive Loads Table 1 provides the recommended RS for various capacitive loads. The recommended RS values result in