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www.fairchildsemi.com rev. 1.0.1 6/13/01 features unity gain bandwidth for RC4156 ?3.5 mhz unity gain bandwidth for rc4157 ?19 mhz high slew rate for RC4156 ?1.6 v/? high slew rate for rc4157 ?8.0v/? block diagram a d c b 65-3463-01 output (a) ?nput (a) +input (a) +input (b) ?nput (b) output (b) output (d) ?nput (d) +input (d) +input (c) ?nput (c) output (c) + + + + low noise voltage ?1.4 ?rms inde?ite short circuit protection no crossover distortion description the RC4156 and rc4157 are monolithic integrated circuits, consisting of four independent high performance operational ampli?rs constructed with an advanced epitaxial process. these ampli?rs feature improved ac performance which far exceeds that of the 741 type ampli?rs. also featured are excellent input characteristics and low noise, making this device the optimum choice for audio, active ?ter and instru- mentation applications. the rc4157 is a decompensated version of the RC4156 and is ac stable in gain con?ura- tions of -5 or greater. pin assignments 1 2 3 4 5 6 7 14 13 12 11 10 9 8 output (a) input (a) +input (a) +v s +input (b) input (b) output (b) output (d) input (d) +input (d) v s +input (c) input (c) output (c) 65-3463-02 RC4156/rc4157 high performance quad operational ampli?rs www..net
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 (v s = 15v, rc = 0 c t a +70 c) parameter min typ max units supply voltage 20 v input voltage 2 15 v differential input voltage 30 v output short circuit duration 3 inde nite p d t a < 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 t a > 50 c derate at soic 5.0 mw/ c pdip 6.25 mw/ c parameter min typ max units jc thermal resistance 60 c/w ja 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 k ? 6.5 mv input offset current 100 na input bias current 400 na large signal voltage gain r l 2 k ? ,v out 10v 15 v/mv output voltage swing r l 2 k ? 10 v supply current 10 ma average input offset voltage drift 5.0 v/ c
RC4156/rc4157 product specification rev. 1.0.1 6/13/01 3 electrical characteristics (v s = 15v and t a = +25 c unless otherwise noted) note: 1. sample tested only. RC4156/4157 units parameters test conditions min typ max input offset voltage r s 10 k ? 1.0 5.0 mv input offset current 30 50 na input bias current 60 300 na input resistance 0.5 m ? large signal voltage gain r l 2 k ? , v out 10v 25 100 v/mv output voltage swing r l 10 k ? 12 14 v r l 2 k ? 10 13 v input voltage range 12 14 v output resistance 230 ? short circuit current 25 ma common mode rejection ratio r s 10 k ? 80 db power supply rejection ratio r s 10 k ? 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/s unity gain bandwidth (4156) 2.8 3.5 mhz phase margin (4156) r l = 2 k ? , c l = 50 pf 50 % transient response (4157) a v = -5 rise time 50 ns overshoot 25 % slew rate 6.5 8.0 v/s unity gain bandwidth (4157) a v = -5 15 19 mhz phase margin (4157) a v = -5, r l = 2 k ? , c l = 50 pf 50 % power bandwidth v out = 20v p-p 20 25 khz input noise voltage 1 f = 20 hz to 20 khz 1.4 5.0 v rms input noise current f = 20 hz to 20 khz 15 pa rms channel separation 108 db
product specification RC4156/rc4157 4 rev. 1.0.1 6/13/01 typical performance characteristics figure 1. open loop gain, phase vs. frequency figure 2. psrr vs. temperature figure 3. channel separation vs. frequency figure 4. transient response vs. temperature figure 5. input noise voltage, current density vs. frequency a vol (db) (deg) f (hz) 65-0738 110 100 90 80 70 60 50 40 30 20 10 0 -10 1 10 100 1k 10k 100k 1m 10m 0 45 90 135 180 4156 a vol r = 2k c = 55 pf l l psrr (db) t a ( c) 65-0740 140 120 100 80 60 40 20 0 -100 -50 0 +50 +100 +150 -25 +25 +75 +125 -75 +v s -v s 100k 1k 1k v out1 100k 1k 1k v out2 c.s. = 20 log ( ) v 100 v out2 out1 65-0739 cs (db) f (hz) -140 -120 -100 -80 -60 -40 -20 0 10 100 1k 10k 100k 3 2 1 5 6 7 4156/57 4156/57 transient response (normalized to +25 c) t a ( c) 65-0741 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 -100 -50 0 +50 +100 +150 -75 -25 +25 +75 +125 65-0742 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 35 30 25 20 15 10 5 0 10 100 1k 10k 100k e n i n f (hz) e n (nv hz ) i n (pa hz )
RC4156/rc4157 product specification rev. 1.0.1 6/13/01 5 typical performance characteristics (continued) figure 6. slew rate, bandwidth vs. temperature figure 7. slew rate, bandwidth vs. supply voltage figure 8. output voltage swing vs. frequency figure 9. output voltage swing vs. load resistance figure 10. small signal phase margin, unity gain bandwidth vs. load capacitance 65-0743 sr,bw (normalized to +25 c) t a ( c) 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 -100 -50 0 +50 +100 +150 65-0744 v s (v) sr, bw (normalized to 15v) 1.1 1.0 0.9 0.8 0.7 0 2 5 10 15 20 bw sr and bw 65-0746 f (hz) v out p-p (v) 4156 (voltage follower) r = open c = 50 pf l l 10 1.0 0.1 30 100 1k 10k 100k 1m v out p-p = 28v v s = 15v v out p-p = 18v v s = 10v v out p-p = 8v v s = 5v 65-0749 r l ( ) v out p-p (v) ? 30 25 20 15 10 05 0 100 1k 10k 100k 65-0745 m (deg) c l (pf) bw (mhz) 70 60 50 40 30 20 10 0 10 100 1k 10k 100k 7 6 5 4 3 2 1 0 m bw 4156
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 65-0747 t a ( c) i b , i os (na) i b i os 140 120 100 80 60 40 20 0- -100 -75 -50 -25 0 +25 +50 +75+100 +125+150 65-0748 t a ( c) cmrr (db) 140 120 100 80 60 40 20 0 -100 -75 -50 -25 0 +25 +50 +75+100 +125+150 applications the RC4156 and rc4157 quad operational ampli?rs 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 ?ter circuits, oscillators and audio ampli?rs. the following applications have been selected to illustrate the advantages of using the fairchild semiconductor RC4156 and rc4157 quad operational ampli?rs. 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 v r be set to obtain a triangle wave at v 2 with ?2v 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 ? when using the RC4156.
RC4156/rc4157 product specification rev. 1.0.1 6/13/01 7 active filters the introduction of low-cost quad op amps has had a strong impact on active ?ter design. the complex multiple- feedback, single op amp ?ter circuits have been rendered obsolete for most applications. state-variable active-?ter circuits using three to four op amps per section offer many advantages over the single op amp circuits. they are rela- tively insensitive to the passive-component tolerances and variations. the q, gain, and natural frequency can be inde- pendently adjusted. hybrid construction is very practical because resistor and capacitor values are relatively low and the ?ter parameters are determined by resistance ratios rather than by single resistors. a generalized circuit diagram of the 2-pole state-variable active ?ter is shown in figure 15. the particular input connections and component-values can be calculated for speci? applications. an important fea- ture of the state-variable ?ter is that it can be inverting or non-inverting and can simultaneously provide three outputs: lowpass, bandpass, and highpass. a notch ?ter can be real- ized by adding one summing op amp. the RC4156 was designed and characterized for use in active ?ter circuits. frequency response is fully speci?d with minimum values for unity-gain bandwidth, slew-rate, and full-power response. maximum noise is speci?d. output swing is excellent with no distortion or clipping. the RC4156 provides full, undistorted response up to 20 khz and is ideal for use in high-performance audio and telecom- munication equipment. in the state-variable ?ter circuit, one ampli?r performs a summing function and the other two act as integrators. the choice of passive component values is arbitrary, but must be consistent with the ampli?r operating range and input signal figure 13. triangle and square wave generator figure 14. triangle generator?ymmetrical output option +15v 30k 1k v 0.12v ~ ~ r square wave output r0 4156/57 a r1 4156/57 d v3 output offset 1k integrator 5k 5k r3 20k r4 1k 20k +15v -15v v4 triangle wave output (+) -12v +12v c0 v2 10k 100k 20k 5k r2 20k v1 comparator 65-0750 amplitude adjust +15v -15v * optional asymmetric ramp slopes 10 9 4 8 11 7 6 5 1 3 2 12 13 14 4156/57 c 4156/57 b * r1 10k 65-2051
product specification RC4156/rc4157 8 rev. 1.0.1 6/13/01 characteristics. the values shown for c1, c2, r4, r5 and r6 are arbitrary. pre-selecting their values will simplify the ?ter tuning procedures, but other values can be used if necessary. the generalized transfer function for the state-variable active ?ter is: filter response is conventionally described in terms of a nat- ural frequency 0 in radians/sec, and q, the quality of the complex pole pair. the ?ter parameters 0 and q relate to the coef?ients in t(s) as: and ts () a 2 s 2 a 1 sa 0 ++ s 2 b 1 sb 0 ++ ----------------------------------- - = 0 b 0 = q 0 b 0 ------ = the input con?uration determines the polarity (inverting or non-inverting), and the output selection determines the type of ?ter response (lowpass, bandpass, or highpass). notch and all-pass con?urations can be implemented by adding another summing ampli?r. bandpass ?ters are of particular importance in audio and telecommunication equipment. a design approach to band- pass ?ters will be shown as an example of the state-variable con?uration. design example bandpass filter for the bandpass active ?ter (figure 16) the input signal is applied through r3 to the inverting input of the summing ampli?r and the output is taken from the ?st integrator (v bp ). the summing ampli?r will maintain equal voltage at the inverting and non-inverting inputs (see equation 1). figure 15. 2-pole state-variable active filter 65-0751 c2 1000 pf v lowpass output lp 4156/57 c r2** c1 1000 pf r5 100k r4 10k r1** r6 100k v highpass ouput hp v bandpass output bp v1 v n r3* r8* r7* * input connections are chosen for inverting or non-inverting response. values of r3,r7,r8 determine gain and q. ** values of r1 and r2 determine natural frequency. 4156/57 b 4156/57 a 10 9 8 5 6 7 3 2 1 equation 1. r3r5 r3 r5 + -------------------- - r4 r3r5 r3 r5 + -------------------- - + ---------------------------------- - v hp s () r3r4 r3 r4 + -------------------- - r5 r3r4 r3 r4 + -------------------- - + ---------------------------------- - v lp s () r4r5 r4 r5 + -------------------- - r3 r4r5 r4 r5 + -------------------- - + ---------------------------------- - v in s () r7 r6 r7 + -------------------- - v bp s () +++
RC4156/rc4157 product specification rev. 1.0.1 6/13/01 9 figure 16. bandpass active filter these equations can be combined to obtain the transfer function: and 65-0752 set center frequency c1 1000 pf RC4156/57 b v bp r2 r1 c2 1000 pf RC4156/57 c r6 100k RC4156/57 a r4 10k r5 100k r3 r7 v trim gain and q in 3 2 1 5 6 7 10 9 8 v bp s () 1 r1c1s ------------------ v hp s () = v lp s () 1 r2c2s ------------------ v bp s () = v bp s () v in s () ----------------- - r4 r3 ------ - 1 r1c1 -------------- - s ? s 2 r7 r6 r7 + -------------------- - 1 r4 r5 ------ - r4 r3 ------ - ++ ?? ?? 1 r1c1 -------------- - ?? ?? s r4 r5 ------ - ?? ?? 1 r1c1r2c2 ------------------------------ ?? ?? ++ ------------------------------------------------------------------------------------------------------------------------------- ----------------------- - = de?ing 1/r1c1 as 1, 1/r2c2 as 2, and substituting in the assigned values for r4, r5, and r6, then the transfer function simpli?s to: this is now in a convenient form to look at the center- frequency 0 and ?ter q. and the frequency responses for various values of q are shown in figure 17. v bp s () v in s () ----------------- - 10 4 r3 -------- 1 s ? s 2 1.1 10 4 r3 -------- + 1 10 5 r7 -------- + ---------------------- 1 s 1 1 2 ------------- ++ ---------------------------------------------------------------------- = 0 0.1 1 2 = 0 10 9 0.1r1r2 = q 1 10 5 r7 -------- + 1.1 10 4 r3 -------- + ---------------------- 0 = figure 17. bandpass transfer characteristics normalized for unity gain and frequency 0 -10 -20 -30 -40 -50 -60 (db) 0.1 1.0 10 65-0753 q = 0.5 q = 1.0 q = 2.0 q = 5.0 q = 10 q = 20 q = 50 q = 100 o o 1 q v v = 1 - + 2 2 2 o 1 q o bp in
product specification RC4156/rc4157 10 rev. 1.0.1 6/13/01 these equations suggest a tuning sequence where is ?st trimmed via r1 or r2, then q is trimmed by varying r7 and/or r3. an important advantage of the state-variable bandpass ?ter is that q can be varied without affecting center frequency 0 . this analysis has assumed ideal op amps operating within their linear range, which is a valid design approach for a reasonable range of 0 and q. at extremes of 0 and at high values of q, the op amp parameters become signi?ant. a rigorous analysis is very complex, but some factors are par- ticularly important in designing active ?ters. 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 in?ite 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 ?ter at high q is very dependent on the op amp open-loop gain at w 0 . 3. the attenuation at extremes of frequency is limited by the op amp gain and unity-gain bandwidth. for integra- tors, the ?ite open-loop op amp gain limits the accu- racy at the low-end. the open-loop roll-off of gain limits the ?ter attenuation at high frequency. the RC4156 quad operational ampli?r has much better fre- quency response than a conventional 741 circuit and is ideal for active ?ter use. natural frequencies of up to 10 khz are readily achieved and up to 20 khz is practical for some con- ?urations. 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-?ter circuits. schematic diagram (1/4 shown) 65-0735 (11) -v s d1 f1 (4) +v s (1,7,8,14) outputs q1 to next amplifier q6 r2 10k (2,6,9,13) - input (3,5,10,12) + input r1 4900 q2 q4 q5 q8 r3 18k q9 r4 22k q10 q7 q3 r9 30 q13 q12 r5 30k d2 c1 q11 q17 q14 r7 20 r6 20 q16 q15 r8 150
RC4156/rc4157 product specification rev. 1.0.1 6/13/01 11 mechanical dimensions (continued) 14-lead plastic dip package d b1 e b e1 a1 a l 7 8 14 1 e eb c d1 a .210 5.33 symbol inches min. max. min. max. millimeters notes a1 .015 .38 .022 .56 b .014 .36 .195 4.95 a2 .115 2.93 b1 .045 .070 1.14 1.78 d .725 .795 18.42 20.19 .300 .325 7.62 8.26 e eb .430 10.92 .115 .200 2.92 5.08 4 2 e .100 bsc 2.54 bsc 2 l 14 14 5 n .240 .280 6.10 7.11 e1 c .008 .015 .20 .38 d1 .005 .13 notes: 1. 2. 3. 4. 5. 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 0.51 b .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 3 6 5 2 2 n14 14 ccc .004 0.10 d .336 .345 8.54 8.76 notes: 1. 2. 3. 4. 5. 6. 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 17 d a a1 c ccc c lead coplanarity seating plane e b l h x 45 c 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

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