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TC7652CPD データシート(PDF) 8 Page - Microchip Technology |
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TC7652CPD データシート(HTML) 8 Page - Microchip Technology |
8 / 16 page TC7652 DS21464B-page 8 © 2002 Microchip Technology Inc. 4.6 Pin Compatibility Where possible, the 8-pin device pinout conforms to such industry standards as the LM101 and LM741. Null storing external capacitors connect to Pins 1 and 8, which are usually for offset null or compensation capac- itors. Output clamp (Pin 5) is similarly used. For OP05 and OP07 devices, replacement of the offset null potentiometer (connected between Pins 1 and 8 and VDD by two capacitors from those pins to VSS) provides compatibility. Replacing the compensation capacitor between Pins 1 and 8 by two capacitors to VSS is required. The same operation (with the removal of any connection to Pin 5) works for LM101, µA748 and sim- ilar parts. Because NC pins provide guarding between input and other pins, the 14-pin device pinout conforms closely to the LM108. Because this device does not use any extra pins and does not provide offset nulling (but requires a compensation capacitor), some layout changes are necessary to convert to the TC7652. 4.7 Some Applications Figures 4-2 and 4-3 show basic inverting and nonin- verting amplifier circuits using the output clamping cir- cuit to enhance overload recovery performance. The only limitations on replacing other op amps with the TC7652 are supply voltage (±8V maximum) and output drive capability (10k Ω load for full swing). Overcome these limitations with a booster circuit (Figure 4-4) to combine output capabilities of the LM741 (or other standard device) with input capabilities of the TC7652. These two form a composite device, therefore, when adding the feedback network, the monitor loop gains stability. FIGURE 4-2: NONINVERTING AMPLIFIER WITH OPTIONAL CLAMP FIGURE 4-3: INVERTING AMPLIFIER WITH OPTIONAL CLAMP FIGURE 4-4: USING 741 TO BOOST OUTPUT DRIVE CAPABILITY Figure 4-5 shows the clamp circuit of a zero offset com- parator. Because the clamp circuit requires the invert- ing input to follow the input signal, problems with a chopper stabilized op amp are avoided. The threshold input must tolerate the output clamp current ≈VIN/R without disrupting other parts of the system. Figure 4-6 shows how the TC7652 can offset null high slew rate and wideband amplifiers. Mixing the TC7652 with circuits operating at ±15V requires a lower supply voltage divider with the TC7660 voltage converter circuit operated "backwards." Figure 4-7 shows an approximate connection. FIGURE 4-5: LOW OFFSET COMPARATOR TC7652 + – Output Clamp Input 0.1µF R2 R1 R3 0.1µF Output Input R2 R1 Clamp 0.1µF 0.1µF TC7652 + – + – +15V -15V -7.5V 0.1 µF In Out -7.5V 0.1 µF 10k Ω TC7652 741 TC7652 + – VOUT Clamp VIN 0.1µF 0.1µF 200k Ω to 2mΩ VTH |
同様の部品番号 - TC7652CPD |
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同様の説明 - TC7652CPD |
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