CLC5644

CLC5644 Low Power, Low Cost, Quad Operational Amplifier July 2001 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 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 14-pin plastic DIP 14-pin plastic SOIC Temperature Range Industrial −40˚C to +85˚C −40˚C to +85˚C Part Number CLC5644IN CLC5644IM CLC5644IMX Package Marking CLC5644IN CLC5644IM CLC5644IM NSC Drawing N14A M14A www.national.com 2 CLC5644 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC-VEE) Output Current Common-Mode Input Voltage Maximum Junction Temperature Storage TemperatureRange +14V 95mA VEE to VCC +150˚C −65˚C to +150˚C Lead Temperature (soldering 10 sec) +300˚C Operating Ratings Thermal Resistance Package MDIP SOIC (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 Frequency Domain Response -3dB Bandwidth AV = 1 VO < 0.5VPP VO < 5VPP −0.1dB Bandwidth Differential Gain Differential Phase Time Domain Response Rise and Fall Time Settling Time to 0.01% Overshoot Slew Rate Distortion And Noise Response 2nd Harmonic Distortion 3rd Harmonic Distortion Equivalent Input Noise Voltage (eni) Non-Inverting Current (ibn) Inverting Current (ibi) Crosstalk (Input Referred) Static, DC Performance Input Offset Voltage (Note 3) Average Drift Input Bias Current (Non-Inverting)(Note 3) Average Drift Input Bias Current (Inverting)(Note 3) Average Drift Power Supply Rejection Ratio Common Mode Rejection Ratio Supply Current (per amplifier)(Note 3) DC DC RL = ∞ 2.5 25 2 15 2.5 24 50 50 2.5 7 – 6 – 7.5 – 46 45 3 15 90 10 80 22 150 44 43 3 mV µV/˚C µA nA/˚C µA nA/˚C dB dB mA 2VPP,1MHz 2VPP,1MHz −72 −79 4.5 1.5 10 76 – – – – – – – – – – – – dBc dBc nV/ pA/ pA/ dB 0.5V Step 5V Step 1V Step 0.5V Step 2.7 7 16 4 1000 – – – – – – – – – – ns ns ns % V/µs NTSC, RL = 150Ω NTSC, RL = 150Ω 170 125 50 25 0.04 0.07 – – – – – – – – MHz MHz MHz MHz dB dB Conditions CLC5644IN/IM Typ +25˚C Min/Max Ratings (Note 2) +25˚C −40 to 85˚C Units > 1MHz > 1MHz > 1MHz 10MHz 3 www.national.com CLC5644 Electrical Characteristics Parameter Miscellaneous Performance Input Resistance (Non-Inverting) Input Capacitance (Non-Inverting) Common-Mode Input Range Output Voltage Range Output Current Output Resistance, Closed Loop (Continued) (AV = +2, Rf =1.65kΩ, RL =100Ω, VS = ± 5V, unless specified) Conditions Typ Min/Max Ratings (Note 2) 1 2 0.5 2 Units 2 1 MΩ pF V V mA mΩ RL = 150Ω DC ± 2.2 ± 2.8 70 0.2 ± 2.0 ± 2.6 50 0.3 ± 1.4 ± 2.5 30 0.6 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. Typical Performance Characteristics Non-Inverting Frequency Response (AV = +2, Rf = 1.65kΩ, RL = 100Ω, VS = +5V) Inverting Frequency Response Normalized Magnitude (0.5dB/div) Vo = 0.25Vpp Gain Av = +1 Rf = 6.98kΩ Av = +2 Rf = 1.65kΩ Normalized Magnitude (0.5dB/div) 45 Vo = 0.25Vpp Gain Av = -1 Rf = 1.1kΩ Av = -2 Rf = 887Ω Phase (deg) 0 -45 -90 -135 -180 -225 -270 -315 -360 -405 Phase (deg) Phase 0 -45 -90 -135 -180 -225 100M DS015009-5 Phase Av = +5 Rf = 499Ω Av = +10 Rf = 249Ω Av = -5 Rf = 422Ω Av = -10 Rf = 294Ω 1M 10M 1M 10M 100M DS015009-6 Frequency (Hz) Frequency (Hz) Frequency Response vs. RL Vo = 5Vpp RL = 100Ω Frequency Response vs. VO Magnitude (1dB/div) Gain Magnitude (1dB/div) Phase (deg) Vo = 0.1Vpp Phase RL = 25Ω RL = 1kΩ Vo = 1Vpp Vo = 2Vpp 0 -90 -180 -270 -360 Vo = 4Vpp 1M 10M 100M -450 1000M DS015009-7 1M 10M 100M DS015009-8 Frequency (Hz) Frequency (Hz) www.national.com 4 CLC5644 Typical Performance Characteristics 2nd & 3rd Harmonic Distortion -50 Vo = 2Vpp 3rd RL = 100Ω (AV = +2, Rf = 1.65kΩ, RL = 100Ω, VS = +5V) (Continued) 2nd & 3rd Harmonic Distortion, RL = 25Ω -30 -40 3rd = 10MHz 2nd = 10MHz -55 -60 Distortion (dBc) -65 -70 -75 -80 -85 -90 -95 1M Distortion (dBc) 2nd RL = 100Ω -50 3rd = 1MHz 2nd RL = 1kΩ 3rd RL = 1kΩ -60 -70 -80 2nd = 1MHz 10M 0 1 2 DS015009-10 Frequency (Hz) DS015009-9 Output Amplitude (Vpp) 2nd & 3rd Harmonic Distortion, RL = 100Ω 2nd & 3rd Harmonic Distortion, RL = 1kΩ DS015009-11 DS015009-12 Small Signal Pulse Response Large Signal Pulse Response Output Voltage (0.1V/div) Time (20ns/div) DS015009-14 DS015009-13 5 www.national.com CLC5644 Typical Performance Characteristics Most Susceptible Channel Pulse Coupling (AV = +2, Rf = 1.65kΩ, RL = 100Ω, VS = +5V) (Continued) Channel to Channel Gain Matching Phase (deg) Active Amplitude (0.5V/div) Magnitude (0.5dB/div) Channel 2 Channel 1 Inactive Amplitude (10mV/div) 0 -45 Channel 3 Active Channel -90 -135 -180 -225 100M DS015009-16 Inactive Channel Channel 4 1M 10M Time (20ns/div) DS015009-15 Frequency (Hz) Equivalent Input Noise 100 100 Open-Loop Transimpedance Gain, Z(s) 130 120 110 200 180 160 Noise Voltage (nV/√Hz) Noise Current (pA/√Hz) Phase (degrees) 20 log[|Vo/Ii|/1Ω] 100 90 80 70 60 50 40 30 1k 10k 100k 1M Gain 140 120 100 80 60 40 20 10M 0 100M Inverting Current = 10pA/√Hz 10 Voltage = 4.5nV/√Hz 10 Phase Non-Inverting Current = 1.5pA/√Hz 1 100 1k 10k 100k 1M 10M 1 100M DS015009-17 Frequency (Hz) Frequency (Hz) DS015009-18 PSRR and CMRR 60 50 40 30 20 10 10k CMRR PSRR, CMRR (dB) PSRR 100k 1M 10M 100M DS015009-19 Frequency (Hz) www.national.com 6 CLC5644 Application Division Current Feedback Amplifiers Some of the key features of current feedback technology are: • Affects frequency response phase linearity Layout Considerations 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. • • 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. Vo Av = Vi 1+ R f Z( jω ) where: Av is the closed loop DC voltage gain Rf is the feedback resistor • (1) • 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 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 • • 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. National Semiconductor Corporation Americas Email: support@nsc.com National Semiconductor Europe Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: ap.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 www.national.com National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.