CLC5644 Low Power, Low Cost, Quad Operational Amplifier General Description The CLC5644 is a quad, current feedback operational amplifier that is perfect for many cost sensitive applications that require high performance, especially when power dissipation is critical. Not only does the CLC5644 offer excellent economy in board space, but has an excellent performance vs power tradeoff which yields a 170MHz Small Signal Bandwidth while dissipating only 25mW. Applications requiring significant density of high speed devices such as video routers, matrix switches and high order active filters will benefit from the configuration of the CLC5644 and the low channel-to-channel crosstalk of 76dB at 1MHz. The CLC5644 provides excellent performance for video applications. Differential gain and phase of 0.04% and 0.07˚ makes this device well suited for many professional composite video systems, but consumer applications will also be able to take advantage of these features due to the device’s low cost. The CLC5644 offers superior dynamic performance with a small signal bandwidth of 170MHz and slew rate of 1000V/µs. These attributes are well suited for many component video applications such as driving RGB signals down significant lengths of cable. These and many other applications can also take advantage of the 0.1dB flatness to 25MHz. Combining wide bandwidth with low cost makes the CLC5644 an attractive option for active filters. SAW filters are often used in IF filters in the 10’s of MHz range, but higher order filters designed around a quad operational amplifier may offer an economical alternative to the typical SAW approach and offer greater freedom in the selection of filter parameters. National Semiconductor’s Comlinear Products Group has published a wide array of literature on active filters and a list of these publications can be found on the last page of this datasheet. n n n n n n 1000 V/us slew rate 2.5mA/channel supply current −72/−79dBc HD2/HD3 (5MHz) 0.04%, 0.07˚ differential gain, phase 70mA output current 16ns settling to 0.1% Applications n n n n n n Portable equipment Video switchers & routers Video line driver Active filters IF amplifier Twisted pair driver/receiver Non-Inverting Frequency Response DS015009-1 Features n 170MHz small signal bandwidth Connection Diagram DS015009-4 Pinout DIP & SOIC © 2001 National Semiconductor Corporation DS015009 www.national.com CLC5644 Low Power, Low Cost, Quad Operational Amplifier July 2001 CLC5644 Typical Configurations DS015009-2 Non-Inverting Gain DS015009-3 Note: Rb provides DC bias for the non-inverting input. Select Rt to yield desired Rin = Rt || Rg. Inverting Gain Ordering Information Package Temperature Range Industrial Part Number Package Marking NSC Drawing 14-pin plastic DIP −40˚C to +85˚C CLC5644IN CLC5644IN N14A 14-pin plastic SOIC −40˚C to +85˚C CLC5644IM CLC5644IM M14A CLC5644IMX CLC5644IM www.national.com 2 Lead Temperature (soldering 10 sec) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Operating Ratings Supply Voltage (VCC-VEE) Output Current Common-Mode Input Voltage Maximum Junction Temperature Storage TemperatureRange Thermal Resistance Package MDIP SOIC +14V 95mA VEE to VCC +150˚C −65˚C to +150˚C +300˚C (θJC) 60˚C/W 55˚C/W (θJA) 110˚C/W 125˚C/W Electrical Characteristics (AV = +2, Rf =1.65kΩ, RL =100Ω, VS = ± 5V, unless specified) Parameter Ambient Temperature Conditions Typ CLC5644IN/IM Min/Max Ratings (Note 2) Units +25˚C +25˚C −40 to 85˚C AV = 1 170 – – MHz VO < 0.5VPP VO < 5VPP 125 – – MHz 50 – – MHz 25 – – MHz Frequency Domain Response -3dB Bandwidth −0.1dB Bandwidth Differential Gain NTSC, RL = 150Ω 0.04 dB Differential Phase NTSC, RL = 150Ω 0.07 dB 0.5V Step 2.7 – – ns Time Domain Response Rise and Fall Time 5V Step 7 – – ns Settling Time to 0.01% 1V Step 16 – – ns Overshoot 0.5V Step 4 – – % 1000 – – V/µs Slew Rate Distortion And Noise Response 2nd Harmonic Distortion 2VPP,1MHz −72 – – dBc 3rd Harmonic Distortion 2VPP,1MHz −79 – – dBc Voltage (eni) > 1MHz 4.5 – – nV/ Non-Inverting Current (ibn) > 1MHz 1.5 – – pA/ Inverting Current (ibi) > 1MHz 10 – – pA/ Crosstalk (Input Referred) 10MHz 76 – – Equivalent Input Noise dB Static, DC Performance Input Offset Voltage (Note 3) 2.5 7 15 mV 25 – 90 µV/˚C 2 6 10 µA Average Drift 15 – 80 nA/˚C Input Bias Current (Inverting)(Note 3) 2.5 7.5 22 µA Average Drift Input Bias Current (Non-Inverting)(Note 3) 24 – 150 nA/˚C Power Supply Rejection Ratio Average Drift DC 50 46 44 dB Common Mode Rejection Ratio DC 50 45 43 dB Supply Current (per amplifier)(Note 3) RL = ∞ 2.5 3 3 mA 3 www.national.com CLC5644 Absolute Maximum Ratings (Note 1) (Continued) (AV = +2, Rf =1.65kΩ, RL =100Ω, VS = ± 5V, unless specified) Parameter Conditions Typ Min/Max Ratings (Note 2) Units Miscellaneous Performance Input Resistance (Non-Inverting) 2 1 0.5 MΩ Input Capacitance (Non-Inverting) 1 2 2 pF ± 2.2 ± 2.8 ± 2.0 ± 2.6 ± 1.4 ± 2.5 V 70 50 30 mA 0.2 0.3 0.6 mΩ Common-Mode Input Range Output Voltage Range RL = 150Ω Output Current Output Resistance, Closed Loop DC V Note 1: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices should be operated at these limits. The table of “Electrical Characteristics” specifies conditions of device operation. Note 2: Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels are determined from tested parameters. Note 3: AJ-level: spec. is 100% tested at +25˚C. Non-Inverting Frequency Response Inverting Frequency Response Gain Av = +1 Rf = 6.98kΩ Phase 0 -45 -90 Av = +5 Rf = 499Ω -135 Av = +10 Rf = 249Ω -180 -225 1M 10M 45 Av = -2 Rf = 887Ω Vo = 0.25Vpp -45 Gain Phase -90 Av = -1 Rf = 1.1kΩ -135 -180 -225 -270 Av = -5 Rf = 422Ω -315 Av = -10 Rf = 294Ω -360 -405 100M 1M Frequency (Hz) 10M 100M Frequency (Hz) DS015009-5 Frequency Response vs. RL DS015009-6 Frequency Response vs. VO Gain Phase 0 RL = 1kΩ RL = 25Ω Vo = 0.1Vpp Magnitude (1dB/div) Phase (deg) RL = 100Ω Vo = 5Vpp -90 -180 -270 Vo = 1Vpp Vo = 2Vpp Vo = 4Vpp -360 1M 10M 100M -450 1000M 1M 10M 100M Frequency (Hz) Frequency (Hz) DS015009-8 DS015009-7 www.national.com 0 Phase (deg) Phase (deg) Av = +2 Rf = 1.65kΩ Vo = 0.25Vpp Normalized Magnitude (0.5dB/div) (AV = +2, Rf = 1.65kΩ, RL = 100Ω, VS = +5V) Normalized Magnitude (0.5dB/div) Typical Performance Characteristics Magnitude (1dB/div) CLC5644 Electrical Characteristics 4 (AV = +2, Rf = 1.65kΩ, RL = 100Ω, VS = +5V) (Continued) 2nd & 3rd Harmonic Distortion 2nd & 3rd Harmonic Distortion, RL = 25Ω -50 -30 Vo = 2Vpp 3rd RL = 100Ω -55 2nd RL = 100Ω -65 Distortion (dBc) Distortion (dBc) 3rd = 10MHz -40 -60 -70 -75 2nd RL = 1kΩ -80 3rd RL = 1kΩ -85 2nd = 10MHz -50 3rd = 1MHz -60 -70 2nd = 1MHz -90 -95 -80 1M 10M 0 Frequency (Hz) 1 2 Output Amplitude (Vpp) DS015009-9 2nd & 3rd Harmonic Distortion, RL = 100Ω DS015009-10 2nd & 3rd Harmonic Distortion, RL = 1kΩ DS015009-11 Large Signal Pulse Response Output Voltage (0.1V/div) Small Signal Pulse Response DS015009-12 Time (20ns/div) DS015009-14 DS015009-13 5 www.national.com CLC5644 Typical Performance Characteristics Most Susceptible Channel Pulse Coupling Channel to Channel Gain Matching Inactive Channel Channel 1 Channel 2 Magnitude (0.5dB/div) Active Channel Phase (deg) Inactive Amplitude (10mV/div) Active Amplitude (0.5V/div) (AV = +2, Rf = 1.65kΩ, RL = 100Ω, VS = +5V) (Continued) 0 -45 Channel 3 -90 -135 Channel 4 -180 -225 1M 100M 10M Frequency (Hz) Time (20ns/div) DS015009-16 DS015009-15 Equivalent Input Noise Open-Loop Transimpedance Gain, Z(s) Noise Voltage (nV/√Hz) Voltage = 4.5nV/√Hz Non-Inverting Current = 1.5pA/√Hz 1 100 1k 10k 100k 1M 10M 1 100M 50 CMRR PSRR 20 1M 10M 100M Frequency (Hz) DS015009-19 www.national.com 160 100 140 Gain 90 120 80 100 Phase 70 80 60 60 50 40 40 20 10k 100k 1M 10M 0 100M DS015009-18 60 100k 180 110 Frequency (Hz) PSRR and CMRR 10 10k 120 1k DS015009-17 30 200 30 Frequency (Hz) 40 130 Phase (degrees) 10 Noise Current (pA/√Hz) Inverting Current = 10pA/√Hz 10 20 log[|Vo/Ii|/1Ω] 100 100 PSRR, CMRR (dB) CLC5644 Typical Performance Characteristics 6 CLC5644 Application Division • Affects frequency response phase linearity Layout Considerations Current Feedback Amplifiers Some of the key features of current feedback technology are: A proper printed circuit layout is essential for achieving high frequency performance. National provides evaluation boards for the CLC5644 (CLC730024-DIP, CLC730031-SOIC) and suggests their use as a guide for high frequency layout and as an aid for device testing and characterization. General layout and supply bypassing play major roles in high frequency performance. Follow these steps below as a basis for high frequency layout: • Independence of AC bandwidth and voltage gain • Inherently stable at unity gain • Adjustable frequency response with Rf • High slew rate • Fast settling Current feedback operation can be described using a simple equation. The voltage gain for a non-inverting or inverting current feedback amplifier is approximated by Equation 1. Vo Av = Vi 1+ R f Z( jω ) (1) where: Av is the closed loop DC voltage gain Rf is the feedback resistor Include 6.8µF tantalum and 0.1µF ceramic capacitors on both supplies. • Place the 6.8µF capacitors within 0.75 inches of the power pins. • Place the 0.1µF capacitors less than 0.1 inches from the power pins. • Remove the ground plane under and around the part, especially near the input and output pins to reduce parasitic capacitance. • • Minimize all trace lengths to reduce series inductances. Use flush-mount printed circuit board pins for prorotyping, never use high profile DIP sockets. Active Filter Application Notes OA-21 Simplified Component Pre-Distortion for High Speed Active Filters OA-26 Designing High-Speed Active Filters OA-27 Low-Sensitivity, Lowpass Filter Design OA-28 Low-Sensitivity, Bandpass Filter Design with Tuning Method OA-29 Low-Sensitivity, Highpass Filter Design with Parasitic Compensation Z(jω) is the open loop transimpedance gain The denominator of Equation 1 is approximately equal to 1 at low frequencies. Near the −3dB corner frequency, the interaction between Rf and Z(jω) dominates the circuit performance. The value of the feedback resistor has a large affect on the circuits performance. Increasing Rf has the following affects: • • • • • Decreases loop gain Decreases bandwidth Reduces gain peaking Lowers pulse response overshoot 7 www.national.com CLC5644 Physical Dimensions inches (millimeters) unless otherwise noted 14-Pin MDIP NS Package Number N14A 14-Pin SOIC NS Package Number M14A www.national.com 8 CLC5644 Low Power, Low Cost, Quad Operational Amplifier Notes LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 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