RC4156 FAIRCHILD | Alldatasheet

Document overview

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Technical content

Features

  • Unity gain bandwidth for RC4156 – 3.5 MHz
  • Unity gain bandwidth for RC4157 – 19 MHz
  • High slew rate for RC4156 – 1.6 V/µS
  • High slew rate for RC4157 – 8.0V/µS Block Diagram A D CB 65-3463-01 Output (A) –Input (A) +Input (A) +Input (B) –Input (B) Output (B) Output (D) –Input (D) +Input (D) +Input (C) –Input (C) Output (C)
  • Low noise voltage – 1.4 µVRMS
  • Indefinite short circuit protection
  • No crossover distortion

Description

The RC4156 and RC4157 are monolithic integrated circuits, consisting of four independent high performance operational amplifiers constructed with an advanced epitaxial process. These amplifiers feature improved AC performance which far exceeds that of the 741 type amplifiers. Also featured are excellent input characteristics and low noise, making this device the optimum choice for audio, active filter and instru- mentation applications. The RC4157 is a decompensated version of the RC4156 and is AC stable in gain configura- tions of -5 or greater. Pin Assignments Output (A) –Input (A) +Input (A) +VS +Input (B) –Input (B) Output (B) Output (D) –Input (D) +Input (D) –VS +Input (C) –Input (C) Output (C) 65-3463-02 RC4156/RC4157 High Performance Quad Operational Amplifiers

PRODUCT SPECIFICATION RC4156/RC4157 2 REV. 1.0.1 6/13/01 Absolute Maximum Ratings (beyond which the device may be damaged)1 Notes: 1. Functional operation under any of these conditions is NOT implied. Performance and reliability are guaranteed only if Operating Conditions are not exceeded. 2. For supply voltages less than ±15V, the absolute maximum input voltage is equal to the supply voltage. 3. Short circuit to ground on one amplifier only. Operating Conditions

Electrical Characteristics

(VS = ±15V, RC = 0°C ≤ TA ≤ +70°C) Parameter Min Typ Max Units Supply Voltage ±20 V Input Voltage2 ±15 V Differential Input Voltage 30 V Output Short Circuit Duration

3 Indefinite

PDTA < 50°C SOIC 300 mW PDIP 468 mW Operating Temperature RC4156/RC4157 0 70 °C Storage Temperature -65 150 °C Junction Temperature SOIC, PDIP 125 °C Lead Soldering Temperature (60 seconds) DIP 300 °C SOIC 260 °C For TA > 50°C Derate at SOIC 5.0 mW/ °C PDIP 6.25 mW/ °C Parameter Min Typ Max Units θJC Thermal resistance 60 °C/W θJA Thermal resistance SOIC 200 °C/W PDIP 160 °C/W RC4156/4157 Parameters Test Conditions Min Typ Max Units Input Offset Voltage R S ≤ 10 kΩ 6.5 mV Input Offset Current 100 nA Input Bias Current 400 nA Large Signal Voltage Gain R L ≥ 2 kΩ,VOUT ±10V 15 V/mV Output Voltage Swing R L ≥ 2 kΩ ±10 V Supply Current 10 mA Average Input Offset Voltage Drift 5.0 µV/ °C

RC4156/RC4157 PRODUCT SPECIFICATION REV. 1.0.1 6/13/01 3 (VS = ±15V and TA = +25°C unless otherwise noted) Note: 1. Sample tested only. RC4156/4157 UnitsParameters Test Conditions Min Typ Max Input Offset Voltage R S ≤ 10 kΩ 1.0 5.0 mV Input Offset Current 30 50 nA Input Bias Current 60 300 nA Input Resistance 0.5 M Ω Large Signal Voltage Gain R L ≥ 2 kΩ, VOUT ±10V 25 100 V/mV Output Voltage Swing R L ≥ 10 kΩ ±12 ±14 V RL ≥ 2 kΩ ±10 ±13 V Input Voltage Range ±12 ±14 V Output Resistance 230 Ω Short Circuit Current 25 mA Common Mode Rejection Ratio R S ≤ 10 kΩ 80 dB Power Supply Rejection Ratio R S ≤ 10 kΩ 80 dB Supply Current (All Amplifiers) R L = ∞ 5.0 7.0 mA Transient Response (4156) Rise Time 60 nS Overshoot 25 % Slew Rate 1.3 1.6 V/µS Unity Gain Bandwidth (4156) 2.8 3.5 MHz Phase Margin (4156) R L = 2 kΩ, CL = 50 pF 50 % Transient Response (4157) A V = -5 Rise Time 50 nS Overshoot 25 % Slew Rate 6.5 8.0 V/µS Unity Gain Bandwidth (4157) A V = -5 15 19 MHz Phase Margin (4157) A V = -5, RL = 2 kΩ, CL = 50 pF 50 % Power Bandwidth V OUT = 20Vp-p 20 25 kHz Input Noise Voltage 1 F = 20 Hz to 20 kHz 1.4 5.0 µV RMS Input Noise Current F = 20 Hz to 20 kHz 15 pA RMS Channel Separation 108 dB

PRODUCT SPECIFICATION RC4156/RC4157 6 REV. 1.0.1 6/13/01 Typical Performance Characteristics (continued) Figure 11. Input Bias, Offset Current vs. Temperature Figure 12. CMRR vs. Temperature

Applications

The RC4156 and RC4157 quad operational amplifiers can be used in almost any 741 application and will provide superior performance. The higher unity gain bandwidth and slew rate make it ideal for applications requiring good frequency response, such as active filter circuits, oscillators and audio amplifiers. The following applications have been selected to illustrate the advantages of using the Fairchild Semiconductor RC4156 and RC4157 quad operational amplifiers. Triangle and Square Wave Generator The circuit of Figure 13 uses a positive feedback loop closed around a combined comparator and integrator. When power is applied the output of the comparator will switch to one of two states, to the maximum positive or maximum negative voltage. This applies a peak input signal to the integrator, and the integrator output will ramp either down or up, oppo- site of the input signal. When the integrator output (which is connected to the comparator input) reaches a threshold set by R1 and R2, the comparator will switch to the opposite polar- ity. This cycle will repeat endlessly, the integrator charging positive then negative, and the comparator switching in a square wave fashion. The amplitude of V 2 is adjusted by varying R1. For best operation, it is recommended that R1 and VR be set to obtain a triangle wave at V2 with ±12V amplitude. This will then allow A3 and A4 to be used for independent adjustment of output-offset and amplitude over a wide range. The triangle wave frequency is set by C0, R0, and the maxi- mum output voltages of the comparator. A more symmetrical waveform can be generated by adding a back-to-back Zener diode pair as shown in Figure 14. An asymmetric triangle wave is needed in some applications. Adding diodes as shown by the dashed lines is a way to vary the positive and negative slopes independently. The frequency range can be very wide and the circuit will function well up to about 10 kHz. The square wave transi- tion time at V 1 is less than 21 µS when using the RC4156.

tuning procedures, but other values can be used if necessary. of filter response (lowpass, bandpass, or highpass). adding another summing amplifier. the inverting and non-inverting inputs (see Equation 1). Figure 15. 2-Pole State-Variable Active Filter R3,R7,R8 determine gain and Q. ** Values of R1 and R2 determine natural frequency.

PRODUCT SPECIFICATION RC4156/RC4157 10 REV. 1.0.1 6/13/01 These equations suggest a tuning sequence where ω is first trimmed via R1 or R2, then Q is trimmed by varying R7 and/or R3. An important advantage of the state-variable bandpass filter is that Q can be varied without affecting center frequency ω This analysis has assumed ideal op amps operating within their linear range, which is a valid design approach for a reasonable range of ω 0 and Q. At extremes of ω0 and at high values of Q, the op amp parameters become significant. A rigorous analysis is very complex, but some factors are par- ticularly important in designing active filters. 1. The passive component values should be chosen such that all op amps are operating within their linear region for the anticipated range of input signals. Slew rate, out- put current rating, and common-mode input range must be considered. For the integrators, the current through the feedback capacitor (I = C dV/dt) should be included in the output current computations. 2. From the equation for Q, it should seem that infinite Q could be obtained by making R7 zero. But as R7 is made small, the Q becomes limited by the op amp gain at the frequency of interest. The effective closed-loop gain is being increased directly as R7 is made smaller, and the ratio of open-loop gain to closed-loop gain is becoming less. The gain and phase error of the filter at high Q is very dependent on the op amp open-loop gain at w 3. The attenuation at extremes of frequency is limited by the op amp gain and unity-gain bandwidth. For integra- tors, the finite open-loop op amp gain limits the accu- racy at the low-end. The open-loop roll-off of gain limits the filter attenuation at high frequency. The RC4156 quad operational amplifier has much better fre- quency response than a conventional 741 circuit and is ideal for active filter use. Natural frequencies of up to 10 kHz are readily achieved and up to 20 kHz is practical for some con- figurations. Q can range up to 50 with very good accuracy and up to 500 with reasonable response. The extra gain of the RC4156 at high frequencies gives the quad op amp an extra margin of performance in active-filter circuits. Schematic Diagram (1/4 shown) 65-0735 (11) -V s (4) +V s (1,7,8,14) Outputs To Next Amplifier 10K (2,6,9,13) - Input (3,5,10,12) + Input 4900 Q4 Q5 18K 22K Q10Q7 Q13 Q12 30K Q11 Q17 Q14 Q16 Q15 150

RC4156/RC4157 PRODUCT SPECIFICATION REV. 1.0.1 6/13/01 11 Mechanical Dimensions (continued) 14-Lead Plastic DIP Package D e B A L 8 14 E eB C A — .210 — 5.33 Symbol Inches Min. Max. Min. Max. Millimeters Notes A1 .015 — .38 — .022 .56B .014 .36 .195 4.95A2 .115 2.93 B1 .045 .070 1.14 1.78 D .725 .795 18.42 20.19 .300 .325 7.62 8.26E eB — .430 — 10.92 .115 .200 2.92 5.08 e .100 BSC 2.54 BSC L 14 14 5N .240 .280 6.10 7.11E1 C .008 .015 .20 .38 D1 .005 — .13 — Notes: Dimensioning and tolerancing per ANSI Y14.5M-1982. "D" and "E1" do not include mold flashing. Mold flash or protrusions shall not exceed .010 inch (0.25mm). Terminal numbers are shown for reference only. "C" dimension does not include solder finish thickness. Symbol "N" is the maximum number of terminals.

PRODUCT SPECIFICATION RC4156/RC4157 12 REV. 1.0.1 6/13/01 Mechanical Dimensions (continued) 14-Lead SOIC Package A .053 .069 1.35 1.75 Symbol Inches Min. Max. Min. Max. Millimeters Notes A1 .004 .010 0.10 0.25 .020 0.51B .013 0.33 C .008 .010 0.19 0.25 E .150 .158 3.81 4.01 e .228 .244 5.79 6.20 .010 .020 0.25 0.50 H .050 BSC 1.27 BSC h L .016 .050 0.40 1.27 0° 8° 0° 8° N1 4 1 4 α ccc .004 0.10—— D .336 .345 8.54 8.76 Notes: Dimensioning and tolerancing per ANSI Y14.5M-1982. "D" and "E" do not include mold flash. Mold flash or protrusions shall not exceed .010 inch (0.25mm). "L" is the length of terminal for soldering to a substrate. Terminal numbers are shown for reference only. "C" dimension does not include solder finish thickness. Symbol "N" is the maximum number of terminals. 14 8 D A – C – ccc C LEAD COPLANARITY SEATING PLANEe B L h x 45° C α EH

PRODUCT SPECIFICATION RC4156/RC4157 6/13/01 0.0m 003 Stock#DS30004841 © 2001 Fairchild Semiconductor Corporation LIFE SUPPORT POLICY FAIRCHILD’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 FAIRCHILD 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 (c) 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 of the user. 2. A critical component in 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. www.fairchildsemi.com DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

Ordering Information

Product Number Temperature Range Screening Package Package Marking RC4156N 0 ° to 70°C Commercial 14 Pin Plastic DIP RC4156N RC4157N 0 ° to 70°C Commercial 14 Pin Plastic DIP RC4157N RC4156M 0 ° to 70°C Commercial 14 Pin Wide SOIC RC4156M RC4157M 0 ° to 70°C Commercial 14 Pin Wide SOIC RC4157M