N CLC5644 Low-Power, Low-Cost, Quad Operational Amplifier General Description Features 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. ■ ■ ■ ■ ■ ■ ■ 170MHz small signal bandwidth 1000 V/µs 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 ■ ■ 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. ■ ■ ■ ■ Portable equipment Video switchers & routers Video line driver Active filters IF amplifier Twisted pair driver/receiver Normalized Magnitude (0.5dB/div) Non-Inverting Frequency Response Combining wide bandwidth with low cost makes the 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 liturature on active filters and a list of these publications can be found on the last page of this datasheet. Av = +2 Rf = 1.65kΩ Vo = 0.25Vpp CLC5644 Low-Power, Low-Cost, Quad Operational Amplifier June 1999 Av = +1 Rf = 6.98kΩ Av = +5 Rf = 499Ω Av = +10 Rf = 249Ω 1M 10M 100M Frequency (Hz) Typical Configurations Non-Inverting Gain Inverting Gain + + + 0.1µF - Rf 0.1µF Rg Rb Vo 1/4 CLC5644 Rt + 6.8µF VEE © 1999 National Semiconductor Corporation Printed in the U.S.A. 0.1µF Vo 1/4 CLC5644 Vin Rg - Rf 0.1µF Rt Note: Rb provides DC bias for the non-inverting input. Select Rt to yield desired Rin = Rt || Rg. + + R Vo = A v = 1+ f Vin Rg DIP & SOIC 6.8µF 6.8µF Vin Pinout VCC VCC R Vo = Av = − f Vin Rg 6.8µF VEE http://www.national.com CLC5644 Electrical Characteristics (A v PARAMETERS Ambient Temperature = +2, Rf = 1.65kΩ, RL = 100Ω, Vs = ±5V, unless specified) CONDITIONS CLC5644I TYP +25°C FREQUENCY DOMAIN RESPONSE -3dB bandwidth Av = 1 Vo < 0.5Vpp Vo < 5Vpp 0.1dB bandwidth differential gain NTSC, RL = 150Ω differential phase NTSC, RL = 150Ω TIME DOMAIN RESPONSE rise and fall time 0.5V step 5V step 1V step 0.5V step settling time to 0.1% overshoot slew rate DISTORTION AND NOISE RESPONSE 2nd harmonic distortion 2Vpp, 1MHz 3rd harmonic distortion 2Vpp, 1MHz equivalent input noise voltage (eni) >1MHz non-inverting current (ibn) >1MHz inverting current (ibi) >1MHz crosstalk (input inferred) 10MHz STATIC DC PERFORMANCE input offset voltage average drift input bias current (non-inverting) average drift input bias current (inverting) average drift power supply rejection ratio common-mode rejection ratio supply current (per channel) DC DC RL= ∞ MISCELLANEOUS PERFORMANCE input resistance (non-inverting) input capacitance (non-inverting) common-mode input range output voltage range RL = 150Ω output current output resistance, closed loop DC MIN/MAX RATINGS +25°C -40 to 85°C UNITS 170 125 50 25 0.04 0.07 – – – – – – – – – – – – MHz MHz MHz MHz dB dB 2.7 7 16 4 1000 – – – – – – – – – – ns ns ns % V/µs -72 -79 – – – – dBc dBc 4.5 1.5 10 76 – – – – – – – – nV/√Hz pA/√Hz pA/√Hz dBc 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 2 1 ±2.2 ±2.8 70 0.2 1 2 ±2.0 ±2.6 50 0.3 0.5 2 ±1.4 ±2.5 30 0.6 MΩ pF V V mA mΩ NOTES A A A A Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels are determined from tested parameters. Absolute Maximum Ratings Notes A) I-level: spec is 100% tested at +25°C. supply voltage (VCC - VEE) output current common-mode input voltage maximum junction temperature storage temperature range lead temperature (soldering 10 sec) Reliability Information Transistor Count MTBF (based on limited test data) 152 23.6Mhr Ordering Information Package Thermal Resistance Package Plastic (IN) Surface Mount (IM) http://www.national.com θJC θJA 60°C/W 55°C/W 110°C/W 125°C/W +14V 95mA VEE to VCC +150°C -65°C to +150°C +300°C Model CLC5644IN CLC5644IM CLC5644IMX 2 Temperature Range -40°C to +85°C -40°C to +85°C -40°C to +85°C Description 14-pin PDIP 14-pin SOIC 14-pin tape and reel CLC5644 Typical Performance (A v Normalized Magnitude (0.5dB/div) -45 -90 Av = +5 Rf = 499Ω -135 Av = +10 Rf = 249Ω -180 -225 1M 10M 0 Gain -90 Av = -1 Rf = 1.1kΩ Phase -135 -180 -225 -270 Av = -5 Rf = 422Ω -315 Av = -10 Rf = 294Ω 1M 1M 10M Frequency (Hz) 2nd & 3rd Harmonic Distortion, RL = 25Ω 3rd RL = 100Ω 2nd RL = 100Ω -65 -70 -75 2nd RL = 1kΩ -80 3rd RL = 1kΩ -85 Vo = 4Vpp Distortion (dBc) Distortion (dBc) Vo = 2Vpp 3rd = 10MHz -40 -60 Vo = 1Vpp -450 1000M 100M -30 -55 Magnitude (1dB/div) -270 100M 2nd & 3rd Harmonic Distortion Vo = 0.1Vpp -90 -180 Frequency (Hz) Vo = 2Vpp 2nd = 10MHz -50 3rd = 1MHz -60 -70 2nd = 1MHz -90 -80 -95 10M 1M 100M 0 10M Frequency (Hz) 1 Frequency (Hz) 2nd & 3rd Harmonic Distortion, RL = 100Ω -50 Small Signal Pulse Response -60 2nd = 5MHz -70 2nd = 5MHz Output Voltage (0.1V/div) 3rd = 5MHz Distortion (dBc) -60 -70 3rd = 1MHz 2nd = 1MHz 3rd = 5MHz -80 3rd = 1MHz -90 -100 -90 -110 -100 2 Output Amplitude (Vpp) 2nd & 3rd Harmonic Distortion, RL = 1kΩ -50 Distortion (dBc) 0 RL = 1kΩ RL = 25Ω -360 -50 -80 Phase -360 10M Frequency (Hz) 1M Gain -405 100M Frequency Response vs. Vo RL = 100Ω Vo = 5Vpp -45 Magnitude (1dB/div) Normalized Magnitude (0.5dB/div) 0 Vo = 0.25Vpp Phase (deg) Av = +1 Rf = 6.98kΩ 45 Av = -2 Rf = 887Ω Phase (deg) Phase (deg) Av = +2 Rf = 1.65kΩ Gain Phase Frequency Response vs. RL Inverting Frequency Response Non-Inverting Frequency Response Vo = 0.25Vpp = +2, Rf = 1.65kΩ, RL = 100Ω, Vs = +5V, unless specified) 2nd = 1MHz -120 1 2 0 Output Amplitude (Vpp) 1 Time (20ns/div) 2 Output Amplitude (Vpp) Most Susceptible Channel Pulse Coupling Active Channel Inactive Channel Phase (deg) Output Voltage (0.1V/div) Channel to Channel Gain Matching Inactive Amplitude (10mV/div) Active Amplitude (0.5V/div) Large Signal Pulse Response Channel 1 Channel 2 Magnitude (0.5dB/div) 0 0 -45 Channel 3 -90 -135 Channel 4 -180 -225 Time (20ns/div) Time (20ns/div) 1M 100M 10M Frequency (Hz) Equivalent Input Noise 10 Voltage = 4.5nV/√Hz Non-Inverting Current = 1.5pA/√Hz 1k 10k 100k 1M Frequency (Hz) 10M 1 100M 200 120 180 110 160 100 140 Gain 90 120 100 80 Phase 70 80 60 60 50 40 40 20 30 1k 10k 100k 1M Frequency (Hz) 3 10M 0 100M 60 PSRR, CMRR (dB) 10 130 Phase (degrees) Inverting Current = 10pA/√Hz 20 log[|Vo/Ii|/1Ω] 100 Noise Current (pA/√Hz) Noise Voltage (nV/√Hz) 100 1 100 PSRR and CMRR Open-Loop Transimpedance Gain, Z(s) 50 CMRR 40 PSRR 30 20 10 10k 100k 1M 10M 100M Frequency (Hz) http://www.national.com CLC5644 Low-Power, Low-Cost, Quad Operational Amplifier 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 the steps below as a basis for high frequency layout: Current Feedback Amplifiers Some of the key features of current feedback technology are: ■ 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 ) ■ ■ Equation 1 ■ where: Av is the closed loop DC voltage gain Rf is the feedback resistor 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 ■ Affects frequency response phase linearity ■ 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 prototyping, 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 Customer Design Applications Support National Semiconductor is committed to design excellence. For sales, literature and technical support, call the National Semiconductor Customer Response Group at 1-800-272-9959 or fax 1-800-737-7018. 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 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. 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. N National Semiconductor Corporation National Semiconductor Europe National Semiconductor Hong Kong Ltd. National Semiconductor Japan Ltd. 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 Fax: (+49) 0-180-530 85 86 E-mail: europe.support.nsc.com Deutsch Tel: (+49) 0-180-530 85 85 English Tel: (+49) 0-180-532 78 32 Francais Tel: (+49) 0-180-532 93 58 Italiano Tel: (+49) 0-180-534 16 80 2501 Miramar Tower 1-23 Kimberley Road Tsimshatsui, Kowloon Hong Kong Tel: (852) 2737-1600 Fax: (852) 2736-9960 Tel: 81-043-299-2309 Fax: 81-043-299-2408 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. http://www.national.com 4