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TL852CNE4 Datasheet(PDF) 4 Page - Texas Instruments |
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TL852CNE4 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 12 page TL852 SONAR RANGING RECEIVER SLSS003 − SEPTEMBER 1983 − REVISED MARCH 1988 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 APPLICATION INFORMATION detect level versus gain step Detect level is measured by applying a 15-cycle burst of 49.4 kHz square wave just after the beginning of the gain step to be tested. The least burst amplitude that makes REC reach the trip level is defined to be the detect level. System gain is then inversely proportional to detect level. See the test circuit in Figure 1. 490 k Ω 5 k Ω 5 k Ω R1 0.01 µF 0.0022 µF 21 mH 500 pF 0.01 µF L1 1 mH 8 7 6 5 4 3 2 1 VCC 1000 pF Trip Level Detect 15-Cycle 49.4-kHz Variable-Amplitude Burst Generator 68 k Ω 9 10 11 12 13 14 15 16 BIAS G2IN G1OUT VCC LC GADJ XIN G1IN REC NC NC GCC GCB GCA GCD GND TL331 15 Pulses Trip Level Input Signal Rec Output Comparator Output All Resistors ±1%, 1/4 W All Capacitors ±1%, Film L1 Q > 60 at 50 kHz C1 Q > 500 at 50 kHz Figure 1. Detect-Level Measurement Circuit and Waveforms |
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