Datasheet SA571 (ON Semiconductor) - 9
| 制造商 | ON Semiconductor |
| 描述 | Compandor |
| 页数 / 页 | 12 / 9 — SA571. Figure 16. Control Signal Feedthrough. Operation Amplifier. Figure … |
| 文件格式/大小 | PDF / 230 Kb |
| 文件语言 | 英语 |
SA571. Figure 16. Control Signal Feedthrough. Operation Amplifier. Figure 15. Dynamic Range. Figure 17. Operational Amplifier
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SA571
Figure 15 shows the noise performance of the DG cell. VCC The maximum output level before clipping occurs in the gain cell is plotted along with the output noise in a 20 kHz R−SELECT FOR bandwidth. Note that the noise drops as the gain is reduced for the first 20 dB of gain reduction. At high gains, the signal 3.6V to noise ratio is 90 dB, and the total dynamic range from 100kW TO PIN 3 OR 14 maximum signal to minimum noise is 110 dB. 470kW +20 0
Figure 16. Control Signal Feedthrough
MAXIMUM −20 SIGNAL LEVEL 90dB
Operation Amplifier
−40 110dB The main op amp shown in the chip block diagram is equivalent to a 741 with a 1.0 MHz bandwidth. Figure 17 OUTPUT (dBm) −60 shows the basic circuit. Split collectors are used in the input pair to reduce gM, so that a small compensation capacitor of −80 just 10 pF may be used. The output stage, although capable NOISE IN 20kHz BW of output currents in excess of 20 mA, is biased for a low −100 −40 −20 0 quiescent current to conserve power. When driving heavy VCA GAIN (0dB) loads, this leads to a small amount of crossover distortion.
Figure 15. Dynamic Range
I I 1 2 Control signal feedthrough is generated in the gain cell by Q6 imperfect device matching and mismatches in the current Q D −IN 1 Q2 1 +IN OUT D sources, I 2 1 and I2. When no input signal is present, changing CC IG will cause a small output signal. The distortion trim is effective in nulling out any control signal feedthrough, but Q2 in general, the null for minimum feedthrough will be Q4 Q3 different than the null in distortion. The control signal feedthrough can be trimmed independently of distortion by tying a current source to the DG input pin. This effectively
Figure 17. Operational Amplifier
trims I1. Figure 16 shows such a trim network.
ORDERING INFORMATION Device Description Temperature Range Shipping
† SA571D 16−Pin Plastic Small Outline (SO−16 WB) Package −40 to +85°C 47 Units / Rail SA571DG 16−Pin Plastic Small Outline (SO−16 WB) Package −40 to +85°C 47 Units / Rail (Pb−Free) SA571DR2 16−Pin Plastic Small Outline (SO−16 WB) Package −40 to +85°C 1000 / Tape & Reel SA571DR2G 16−Pin Plastic Small Outline (SO−16 WB) Package −40 to +85°C 1000 / Tape & Reel (Pb−Free) SA571N 16−Pin Plastic Dual In−Line Package (PDIP−16) −40 to +85°C 25 Units / Rail SA571NG 16−Pin Plastic Dual In−Line Package (PDIP−16) −40 to +85°C 25 Units / Rail (Pb−Free) †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.
http://onsemi.com 9
SA571
Figure 15 shows the noise performance of the DG cell. VCC The maximum output level before clipping occurs in the gain cell is plotted along with the output noise in a 20 kHz R−SELECT FOR bandwidth. Note that the noise drops as the gain is reduced for the first 20 dB of gain reduction. At high gains, the signal 3.6V to noise ratio is 90 dB, and the total dynamic range from 100kW TO PIN 3 OR 14 maximum signal to minimum noise is 110 dB. 470kW +20 0
Figure 16. Control Signal Feedthrough
MAXIMUM −20 SIGNAL LEVEL 90dB
Operation Amplifier
−40 110dB The main op amp shown in the chip block diagram is equivalent to a 741 with a 1.0 MHz bandwidth. Figure 17 OUTPUT (dBm) −60 shows the basic circuit. Split collectors are used in the input pair to reduce gM, so that a small compensation capacitor of −80 just 10 pF may be used. The output stage, although capable NOISE IN 20kHz BW of output currents in excess of 20 mA, is biased for a low −100 −40 −20 0 quiescent current to conserve power. When driving heavy VCA GAIN (0dB) loads, this leads to a small amount of crossover distortion.
Figure 15. Dynamic Range
I I 1 2 Control signal feedthrough is generated in the gain cell by Q6 imperfect device matching and mismatches in the current Q D −IN 1 Q2 1 +IN OUT D sources, I 2 1 and I2. When no input signal is present, changing CC IG will cause a small output signal. The distortion trim is effective in nulling out any control signal feedthrough, but Q2 in general, the null for minimum feedthrough will be Q4 Q3 different than the null in distortion. The control signal feedthrough can be trimmed independently of distortion by tying a current source to the DG input pin. This effectively
Figure 17. Operational Amplifier
trims I1. Figure 16 shows such a trim network.
ORDERING INFORMATION Device Description Temperature Range Shipping
† SA571D 16−Pin Plastic Small Outline (SO−16 WB) Package −40 to +85°C 47 Units / Rail SA571DG 16−Pin Plastic Small Outline (SO−16 WB) Package −40 to +85°C 47 Units / Rail (Pb−Free) SA571DR2 16−Pin Plastic Small Outline (SO−16 WB) Package −40 to +85°C 1000 / Tape & Reel SA571DR2G 16−Pin Plastic Small Outline (SO−16 WB) Package −40 to +85°C 1000 / Tape & Reel (Pb−Free) SA571N 16−Pin Plastic Dual In−Line Package (PDIP−16) −40 to +85°C 25 Units / Rail SA571NG 16−Pin Plastic Dual In−Line Package (PDIP−16) −40 to +85°C 25 Units / Rail (Pb−Free) †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.
http://onsemi.com 9