CLC431

CLC431/432 Dual Wideband Monolithic Op Amp with Disable June 1999 N CLC431/432 Dual Wideband Monolithic Op Amp with Disable General Description The CLC431 and CLC432 current-feedback amplifiers provide wide bandwidths and high slew rates for applications where board density and power are key considerations. These amplifiers provide DCcoupled small signal bandwidths exceeding 92MHz while consuming only 7mA per channel. Operating from ±15V supplies, the CLC431/ 432’s enhanced slew rate circuitry delivers large-signal bandwidths with output voltage swings up to 28Vpp. A wide range of bandwidthinsensitive gains are made possible by virtue of the CLC431 and CLC432’s current-feedback topology. The large common-mode input range and fast settling time (70ns to 0.05%) make these amplifiers well suited for CCD & data telecommunication applications. The disable of the CLC431 can accommodate ECL or TTL logic levels or a wide range of user definable inputs. With its fast enable/disable time (0.2µs/1µs) and high channel isolation of 70dB at 10MHz, the CLC431 can easily be configured as a 2:1 MUX. Many high performance video applications requiring signal gain and/or switching will be satisfied with the CLC431/432 due to their very low differential gain and phase errors (less than 0.1% and 0.1°; Av = +2V/V at 4.43MHz into 150Ω load). Quick 8ns rise and fall times on 10V pulses allow the CLC431/432 to drive either twisted pair or coaxial transmission lines over long distances. The CLC431/432's combination of low input voltage noise, wide common-mode input voltage range and large output voltage swings make them especially well suited for wide dynamic range signal processing applications. Features s s s s s Wide bandwidth: 92MHz (AV=+1) 62MHz (Av=+2) Fast slew rate: 2000V/µs Fast disable: 1µs to high-Z output High channel isolation: 70dB at 10MHz Single or dual supplies: ±5V to ±16.5V Video signal multiplexing Twisted-pair differential driver CCD buffer & level shifting Discrete gain-select amplifier Transimpedance amplifier Applications s s s s s Typical Application Discrete Gain Select Amplifier Pinout PDIP & SOIC Rg 500Ω Rf 500Ω 50Ω Ri ½CLC431 50Ω Rs SELECT Ri 1Vpp @ 5MHz 50Ω ½CLC431 500Ω Rf Rg 125Ω Channel 2 (Gain = 5) 50Ω 50Ω 50Ω RL Vout Channel 1 (Gain = 2) CLC431 Vinv1 1 Vnon-inv1 2 DIS1 3 -Vcc 4 DIS2 5 Vnon-inv2 6 Vinv2 7 14 Vout1 13 VRTTL1 12 DIS1 11 +Vcc 10 DIS2 9 VRTTL2 8 Vout2 Vout1 Vinv1 Vnon-inv1 -Vcc 1 2 3 4 + + CLC432 8 7 6 5 +Vcc Vout2 Vinv2 Vnon-inv2 © 1999 National Semiconductor Corporation Printed in the U.S.A. http://www.national.com CLC431/432 Electrical Characteristics (V PARAMETERS Ambient Temperature CONDITIONS CLC431 & CLC432 TYP +25 CC = ±15V; AV= +2; Rf = Rg =750Ω; RL = 100Ω; unless noted) +25 MIN/MAX RATINGS 0 to +70 -40 to +85 UNITS °C NOTES 1 FREQUENCY DOMAIN RESPONSE -3dB bandwidth Vout < 4.0Vpp Vout < 4.0Vpp VCC = ±5V Vout < 10Vpp gain flatness Vout < 4.0Vpp peaking DC to 100MHz rolloff DC to 20MHz linear phase deviation DC to 30MHz differential gain 4.43MHz, RL=150Ω differential phase 4.43MHz, RL=150Ω TIME DOMAIN RESPONSE rise and fall time 10V step overshoot 2V step settling time 2V step to 0.05% slew rate Vout = ±10V DISTORTION AND NOISE RESPONSE 2Vpp, 1MHz 2nd harmonic distortion 2Vpp, 1MHz 3rd harmonic distortion equivalent input noise voltage >1MHz current, inverting >1MHz current, non-inverting >1MHz STATIC DC PERFORMANCE input offset voltage average drift bias current, non-inverting average drift bias current, inverting average drift power supply rejection ratio DC common-mode rejection ratio DC supply current RL= ∞, per channel CLC431 disabled RL= ∞, per channel MISCELLANEOUS PERFORMANCE input voltage range common mode resistance non-inverting capacitance non-inverting output current voltage range RL≥5kΩ RL=100Ω SWITCHING PERFORMANCE (CLC431) switching time turn on turn off DIS logic levels single-ended mode high input voltage (VIH) low input voltage (VIL) maximum current input VIH > DIS > VIL differential mode |DIS-DIS | minimum differential voltage ISOLATION crosstalk, input referred off isolation 10MHz 10MHz 62 62 28 0.05 0.0 0.3 0.12 0.12 8 5 70 2000 - 65 - 75 3.3 13 2.0 3 20 2 25 2 8 64 63 7.1 0.8 ± 12.2 24 0.5 ± 60 ± 14.0 ± 6.0 0.1 0.7 > 2.0 < 0.8 150 0.3 70 64 42 21 0.5 0.8 1.8 0.18 0.18 12 10 100 1500 37 20 0.7 0.8 2.0 0.2 0.23 13 12 110 1450 36 20 0.7 0.8 2.1 0.2 0.25 13 12 110 1400 MHz MHz MHz dB dB ° % ° ns % ns V/ms dBc dBc 2 2 2 6 6 4.2 16 2.5 6 --8 --6 --59 58 7.9 1.2 ± 12.0 16 1 ± 38 ± 13.6 ± 3.7 0.15 1.0 > 2.0 < 0.8 180 0.4 64 60 4.4 17 2.6 7 50 10 100 6 25 59 57 8.5 1.3 ± 11.8 10 1 ± 35 ± 13.4 ± 3.7 0.155 1.2 > 2.0 < 0.8 190 0.4 64 60 4.5 18 2.8 7 50 16 150 8 40 59 56 9.6 1.45 ± 11.6 6 1 ± 30 ± 13.2 ± 2.9 0.165 1.2 > 2.0 < 0.8 205 0.4 64 60 nV/√Hz pA/√Hz pA/√Hz mV µV/°C µA nA/°C µA nA/°C dB dB mA mA V MΩ pF mA V V µs µs 3 V V µA 4 V dB dB A A A A A 5 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 supply voltage short circuit current common-mode input voltage differential input voltage maximum junction temperature storage temperature lead temperature (soldering 10 sec) http://www.national.com Notes 1) Tested and guaranteed with Rf = 866Ω. CLC432 tested and guaranteed with Rf = 750Ω. 2) Spec is guaranteed for RL ≥ 500Ω. 3) VRTTL= 0, See text for single-ended mode of operation. 4) VRTTL= NC, See text for differential mode of operation 5) Spec is guaranteed for AJE; AJP & AIB yield 7dB lower. 6) Spec is tested with 2Vpp, 10MHz and RL= 100Ω. A) J-level: spec is 100% tested at +25°C. ±16.5V 100mA ±Vcc ±10V +150°C -65°C to+150°C +300°C 2 3 http://www.national.com Application Discussion Introduction The CLC431 and the CLC432 are dual wideband currentfeedback op amps that operate from single (+10V to +33V) or dual (±5V to ±16.5) power supplies. The CLC431 is equipped with a disable feature and is offered in 14-pin DIP and SOIC packages. The CLC432 is packaged in a standard 8-pin dual pinout and is offered in an 8-pin DIP and SOIC. Evaluation boards are available for each version of both devices. The evaluation boards can assist in the device and/or application evaluation and were used to generate the typical device performance plots on the preceding pages. Each of the CLC431/CLC432's dual channels provide closely matched DC & AC electrical performance characteristics making them ideal choices for wideband signal processing. The CLC431, with its disable feature, can easily be configured as a 2:1 mux or several can be used to form a 10:1 mux without performance degradation. The two closely-matched channels of the CLC432 can be combined to form composite circuits for such applications as filter blocks, integrators, transimpedance amplifiers and differential line drivers and receivers. Feedback Resistor Selection The loop gain and frequency response for a currentfeedback operational amplifier is determined largely by the feedback resistor (Rf). Package parasitics also influence ac response. Since the package parasitics of the CLC431 and the CLC432 are different, the optimum frequency and phase responses are obtained with different values of feedback resistor (for AV=+2; CLC431: Rf=866Ω, CLC432: Rf=750Ω). The Electrical Characteristics and http://www.national.com Typical Performance plots are valid for both devices under the specified conditions. Generally, lowering Rf from its recommended value will peak the frequency response and extend the bandwidth while increasing its value will roll off the response. Reducing the value of Rf too far below its recommended value will cause overshoot, ringing and eventually oscillation. For more information see Application Note OA-20 and OA-13. In order to optimize the devices' frequency and phase response for gains other than +2V/V it is recommended to adjust the value of the feedback resistor. The two plots found in the Typical Performance section entitled "Recommended Rf vs. Gain" provide the means of selecting the feedback-resistor value that optimizes frequency and phase response over the CLC431/ CLC432's gain range. Both plots show the value of Rf approaching a nonzero minimum at high non-inverting gains, which is characteristic of current-feedback op amps and yields best results. The linear portion of the two Rf vs. Inverting-gain curves results from the limitation placed on Rg (i.e. Rg ≥ 50Ω) in order to maintain an adequate input impedance for the inverting configuration. It should be noted that for stable operation a noninverting gain of +1 requires an Rf equal to 1kΩ for both the CLC431 and the CLC432. CLC431 Disable Feature The CLC431 disable feature can be operated either single-endedly or differentially thereby accommodating a wide range of logic families. There are three pins associated with the disable feature of each of the CLC431's two amplifiers: DIS, DIS and VRTTL (please see pinout on 4 front page). Also note that both amplifiers are guaranteed to be enabled if all three of these pins are unconnected. Fig. 1 illustrates the single-ended mode of the CLC431's disable feature for logic families such as TTL and CMOS. In order to operate properly, VRTTL must be grounded, thereby biasing DIS to approximately +1.4V through the two internal series diodes. For single-ended operation, DIS should be left floating. Applying a TTL or CMOS logic "high" (i.e. >2.0Volts) to DIS will switch the tail current of the differential pair to Q1 and "shut down" Q2 which results in the disabling of that channel of the CLC431. Alternatively, applying a logic "low" (i.e. > R g Rg Rf Impedance Presented by Disabled CLC431 Vin Active Channel R x >> 1 2 πfin C g Ordering Information Ri Impedance Presented by Inactive Channel Ri Rs Vout Model Temperature Range Description 14-pin PDIP 14-pin SOIC dice 14-pin CerDIP, MIL-STD-883 dice, MIL-STD-883 8-pin PDIP 8-pin SOIC dice 8-pin CerDIP, MIL-STD-883 dice, MIL-STD-883 1MΩ 16pF RL Rf Rg CLC431AJP -40°C to +85°C CLC431AJE -40°C to +85°C CLC431ALC -40°C to +85°C CLC431A8B -55°C to +125°C CLC431AMC -55°C to +125°C CLC432AJP -40°C to +85°C CLC432AJE -40°C to +85°C CLC432ALC -40°C to +85°C CLC432A8B -55°C to +125°C CLC432AMC -55°C to +125°C DESC SMD numbers: 5962-94725. Fig. 4 http://www.national.com 6 Reliability Information Transistor count 37 Package Thermal Resistance CLC431 Package AJP AJE CERDIP CLC432 Package AJP AJE CERDIP 55°C 40°C 25°C 110°C 115°C 115°C θ JC 55°C 35°C 25°C θJA 100°C 105°C 80°C 7 http://www.national.com CLC431/432 Dual Wideband Monolithic Op Amp with Disable 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. 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