Download Print this page

Philips AN1651 Application Note

Hide thumbs

Advertisement

Quick Links

INTEGRATED CIRCUITS
AN1651
Using the NE/SA5234 amplifier
Author: Les Hadley
1991 Oct

Advertisement

loading

  Related Manuals for Philips AN1651

  Summary of Contents for Philips AN1651

  • Page 1 INTEGRATED CIRCUITS AN1651 Using the NE/SA5234 amplifier Author: Les Hadley 1991 Oct...
  • Page 2: Detailed Description

    Philips Semiconductors Application note Using the NE/SA5234 amplifier AN1651 Author: L. Hadley 2.5MHz is retained. Slew rate is 0.8V/ s and each op amp will settle to a 1% of nominal level within 1.4 s. I. SUMMARY II. DETAILED DESCRIPTION The NE/SA5234 is a unique low-voltage quad operational amplifier specifically designed to operate in a broadly diverse environment.
  • Page 3 Philips Semiconductors Application note Using the NE/SA5234 amplifier AN1651 – CONVENTIONAL OP AMP PHILIPS NE5234 SL00569 Figure 2. Output Inversion Protection non-inverting input. The output is taken from multiple collectors on the non-inverting side and provides matching for the following stage.
  • Page 4 Philips Semiconductors Application note Using the NE/SA5234 amplifier AN1651 – Q53,54 Q51,52 INPUT OUTPUT CLASS CONTROL INTERMEDIATE STAGE CURRENT CONTROL CLASS AB OUTPUT SL00632 Figure 4. G1000 10Hz 100Hz 1kHz 10kHz 100kHz 1MHz 10 6 FREQUENCY SL00633 Figure 5. NE5234 Closed Loop Gain vs Frequency...
  • Page 5 Philips Semiconductors Application note Using the NE/SA5234 amplifier AN1651 typically 0.2pA/ Hz. The 1/f region was not determined for either +2.5V current or voltage noise. –2.5V for R = 10 -nV/Hz 5234 3585 – SPECTRUM ANALYZER INT. SL00634 Figure 6. Noise Test Circuit...
  • Page 6 Philips Semiconductors Application note Using the NE/SA5234 amplifier AN1651 signal-to-noise ratio at the output of this stage is determined by first 100x10 (EQ. 7.) 20 log multiplying the gain times the signal which gives 1V with a 1.6x10 resultant noise of 400mV .
  • Page 7 Philips Semiconductors Application note Using the NE/SA5234 amplifier AN1651 A series of tests are shown to allow you to see just how resistant (EQ. 8.) this device is to generating clipping distortion. Two different gain (0.163x10 4KT 100 10, 000 configurations were chosen to demonstrate this particular feature: 1.6mV...
  • Page 8 Philips Semiconductors Application note Using the NE/SA5234 amplifier AN1651 VIII. GAIN-BANDWIDTH VS CLOSED LOOP FRE- aforementioned factors that affect the signal-to-noise ratio of the stage and optimizing the Loop-gain. For example, a voice-band QUENCY RESPONSE audio stage which requires 3kHz bandwidth, should be limited to a Figure 5 shows the small signal frequency response of the NE5234 closed-loop gain of 40dB for lowest distortion in the output signal.
  • Page 9 Philips Semiconductors Application note Using the NE/SA5234 amplifier AN1651 800,000 V/sec / 2 1.414 volts peak = 90,090Hz. A graphical Slew Rate (2 f) cos (2 f t) representation of this relationship is shown in Figure 13. By using Note that maximum slew rate occurs where the input sine wave this graph along with the information in the preceding Figure 10 and signal crosses the values of 0, , and 2 on the radian axis.
  • Page 10 Philips Semiconductors Application note Using the NE/SA5234 amplifier AN1651 V CC RECEIVE UNIT NE/SA5234 – – 4700 – = 250 SL00644 SL00643 Figure 15. Non-Inverting Biasing Figure 16. A 4-20mA Current Loop 1.2M 4.3k 4.3k +5.0V – V S.G. S.G.
  • Page 11 Philips Semiconductors Application note Using the NE/SA5234 amplifier AN1651 APPLICATIONS EXAMPLES drive the current loop. The sensitivity is actually in mA/V, or transconductance, which is equal to 1/R . This sensitivity in this Instrumentation particular example is set to 4mA/V. Thus, with a bridge amplifier...
  • Page 12: Active Filters

    AC coupled gain network for single supply tape recorder. It utilizes the Philips Semiconductors NE5234 quad operation. op amp in conjunction with the new low-voltage NE578 compandor...
  • Page 13 Philips Semiconductors Application note Using the NE/SA5234 amplifier AN1651 Figure 23 shows the VOX audio circuit example. A description of DC control signal is fed to A4 which acts as a threshold comparator its operation for voice activated transmission follows.
  • Page 14 The NE578 contains both . A typical delay of two seconds is easily accomplished. Due to operations in the same package. Please refer to Philips extremely high input impedance of the buffer stage A3, R may be Semiconductors applications note AN1762 by Alvin K.
  • Page 15 2/3V Phase inversion may be accomplished, if the logic level signals are Philips Semiconductors. Linear Data Manual, Volume 2 : Industrial. polarity reversed, by making stage 3 inverting and AC coupling the Sunnyvale: 1988.
  • Page 16 Philips Semiconductors Application note Using the NE/SA5234 amplifier AN1651 REL LEVEL ABS LEVEL INPUT TO G AND RECT COMPRESSION EXPANDOR (COMPRESSOR (EXPANDOR OUT) +16dB 2.65V +16.0 +10.68 1.67V +12.0 +6.68 420mV -5.32 -20dB 42mV -25.32 -40dB 4.2mV -45.32 TRANSMISSION -60dB 420 V -65.32...
  • Page 17 Philips Semiconductors Application note Using the NE/SA5234 amplifier AN1651 1N9683 – – NE5234 1N9683 – – Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç...

This manual is also suitable for:

Ne/sa5234