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Philips AN1651 manual

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Table of contents for the manual

  • Page 1

      AN1651 Using the NE/SA5234 amplifier Author: Les Hadley 1991 Oct INTEGRA TED CIRCUITS[...]

  • Page 2

    Philips Semiconductors Application note AN1651 Using the NE/SA5234 amplifier 2 1991 Oct Author: L. Hadley I. SUMMAR Y The NE/SA5234 is a unique low-voltage quad operational amplifier specifically designed to operate in a broadly diverse environment. It is an enhanced pin-for-pin replacement for the LM324 category of devices. Supply conditions can r[...]

  • Page 3

    Philips Semiconductors Application note AN1651 Using the NE/SA5234 amplifier 1991 Oct 3 47k 47k V IN V OUT V CC + – 5V CONVENTIONAL OP AMP PHILIPS NE5234 t t V CC V OUT V OUT V IN V IN V GND V GND V GND V CC 5V SL00569 Figure 2. Output Inversion Protection 6 5 4 3 2 1 0.5 -1 -0.1 +0.1 “N-MODE” CMRR V EE +1 < V CM < V CC “LARGE SIGNAL?[...]

  • Page 4

    Philips Semiconductors Application note AN1651 Using the NE/SA5234 amplifier 1991 Oct 4 D2 I B2 I B4 I B5 I B6 I B8 I B7 I B9 I B3 V B4 V CC I 2 I 1 V EE D3 CLASS AB CONTROL Q61 Q62 Q83 Q85 Q81 Q82 Q71 Q75 Q72 Q78 Q53,54 Q51,52 C1 C2 C3 C4 C5 R82 C6 Q84 OUTPUT INPUT + – INTERMEDIA TE STAGE CURRENT CONTROL CLASS AB OUTPUT R85 R76 R86 R75 SL00632 F[...]

  • Page 5

    Philips Semiconductors Application note AN1651 Using the NE/SA5234 amplifier 1991 Oct 5 4 1 1 + – 47k 5234 100 x10 HP 3585 SPECTRUM ANAL YZER 10 Ω 600 Ω +2.5V –2.5V SL00634 Figure 6. Noise T est Circuit IV . NOISE REFERRED T O THE INPUT The typical spectral voltage noise referred to each of the op amps in the NE/SA5234 is specified to be 25[...]

  • Page 6

    Philips Semiconductors Application note AN1651 Using the NE/SA5234 amplifier 1991 Oct 6 signal-to-noise ratio at the output of this stage is determined by first multiplying the gain times the signal which gives 1V RMS with a resultant noise of 400mV RMS . The signal-to-noise ratio is calculated as S ń N 20log 10 (1.0 ń 4x10 * 4 ) + 68dB (EQ. 5.) [...]

  • Page 7

    Philips Semiconductors Application note AN1651 Using the NE/SA5234 amplifier 1991 Oct 7 (EQ. 8.) ƪ (0.163x10 * 3 ) 2 ) ǒ 4KT @ 100 @ 10, 000 Ǹ Ǔ 2 Ǹ ƫ @ 10 + 1.6mV (EQ. 9.) K + Boltzman Ȁ sConstant + T + 300 o K ; BW + 10kHz 1.38x10 * 23 Joule DegKelvin The amplified output signal = 1V RMS (EQ. 10.) S ń N + 20 log 10 ǒ 1 1.6x10 * 3 Ǔ + 56[...]

  • Page 8

    Philips Semiconductors Application note AN1651 Using the NE/SA5234 amplifier 1991 Oct 8 VIII. GAIN-BANDWIDTH VS CLOSED LOOP FRE - QUENCY RESPONSE Figure 5 shows the small signal frequency response of the NE5234 versus closed-loop gain in dB. The test circuit is shown in Figure 6. The plot is taken from measured data and thus shows how each value of[...]

  • Page 9

    Philips Semiconductors Application note AN1651 Using the NE/SA5234 amplifier 1991 Oct 9 Slew Rate + V P (2 p f) cos (2 p f t) Note that maximum slew rate occurs where the input sine wave signal crosses the values of 0, π , and 2 π on the radian axis. T o get a feel for what this means in regards to the typical low voltage circuit, let us consider[...]

  • Page 10

    Philips Semiconductors Application note AN1651 Using the NE/SA5234 amplifier 1991 Oct 10 + – 10k 4 1 1 R S V CC 2 R R R1 R F C1 CC V CC SL00643 Figure 15. Non-Inverting Biasing NE/SA5234 – + A1 R SH = 250 Ω RECEIVE UNIT T R A N S 4700 Ω + – A2 SL00644 Figure 16. A 4-20mA Current Loop + – 4 1 1 V O 1 3 2 1.2M V2 4.3k 12k 12k +5.0V 1.2M ?[...]

  • Page 11

    Philips Semiconductors Application note AN1651 Using the NE/SA5234 amplifier 1991 Oct 1 1 APPLICA TIONS EXAMPLES Instrumentation Strain Gauge Bridge Amplifier The circuit below shows a simple strain gauge circuit with a gain of 100 (40dB) and operated from a single supply . The chart illustrates the transfer function of the circuit for a single ord[...]

  • Page 12

    Philips Semiconductors Application note AN1651 Using the NE/SA5234 amplifier 1991 Oct 12 IC-1 NE5234 20k Ω 10k Ω V CC VR1 VR2 10k Ω 150 150 150 150 IC-2 NE5234 BDX45 BDX42 + – + – + – + – A3 A2 A4 A5 A6 A1 + – + – PM MOTOR 100 1 V REF R S C L C S 100k Ω VR1-3 = 1.4V +4.5VDC 10 Ω 10 Ω 0.1 µ F 0.1 µ F 4 VR2 SL00648 Figure 20[...]

  • Page 13

    Philips Semiconductors Application note AN1651 Using the NE/SA5234 amplifier 1991 Oct 13 Figure 23 shows the VOX audio circuit example. A description of its operation for voice activated transmission follows. Audio generated by the electret microphone is fed into the non-inverting input of preamp A1 and the signal amplified by 12dB. The biasing is [...]

  • Page 14

    Philips Semiconductors Application note AN1651 Using the NE/SA5234 amplifier 1991 Oct 14 10k Ω 10k Ω 10k Ω 12k Ω 40.2k Ω 2.2M Ω 10k Ω 2.2k Ω 220 Ω 0.15 µ F 1 µ F 4.7 µ F 1nF 0.47 µ F 25k Ω 25k Ω 18k Ω + – + – + – + – + – A1 A2 A3 A4 100k Ω 4 1 1 19 8 16 12 1 1 10 9 7 4.2V OFF ON 0V X1 D2 D1 C t R A +4.5V MIC [...]

  • Page 15

    Philips Semiconductors Application note AN1651 Using the NE/SA5234 amplifier 1991 Oct 15 configuration and its output is squared to swing approximately 5V , the standard TTL level. Again common-mode biasing is passed along from each of the stages up to the last in order minimize parts and simplify circuit layout. The final stage is a simple buffer [...]

  • Page 16

    Philips Semiconductors Application note AN1651 Using the NE/SA5234 amplifier 1991 Oct 16 42 µ V 420 µ V +16dB 0dB -20dB -40dB -60dB -80dB +16.0 0.0 -20 -40 -60 -80 +12.0 A B C D TRANSMISSION MEDIUM DB dBM +10.68 -5.32 -25.32 -45.32 -65.32 -85.32 +6.68 EXP ANDOR OUT COMPRESSION IN V RMS 2.65V 420mV 42mV 4.2mV 1.67V (COMPRESSOR OUT) (EXP ANDOR IN) [...]

  • Page 17

    Philips Semiconductors Application note AN1651 Using the NE/SA5234 amplifier 1991 Oct 17 +3V + – M + – + – + – -3V 4 1 1 1N9683 6 5 7 9 10 8 2 3 1 13 12 14 NE5234 1/100 1N9683 SL00655 Figure 27. Half Bridge Servo[...]