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TSH511 数据表(PDF) 7 Page - STMicroelectronics |
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TSH511 数据表(HTML) 7 Page - STMicroelectronics |
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7 / 25 page  TSH511 Electrical characteristics 7/25 ZAMP_IN Input impedance defined as RAMP_IN in parallel with CAMP_IN RAMP_IN CAMP_IN 10 2 k Ω pF ZAMP_OUT Output impedance 350 Ω P1dBAMP 1dB compression point ZL = 2kΩ ZL = 2kΩ fcarrier= 2.8MHz 560 250 mVRMS BWAMP -3dB AMP bandwidth ZL = 2kΩ 11 MHz Limiter (LIM) section GLIM Voltage gain ZL= 15kΩ tied to GND 50 54 60 dB ZLIM_IN Input impedance defined as RLIM_IN in parallel with CLIM_IN RLIM_IN CLIM_IN 15 2 k Ω pF VLIM_OUT Output voltage ZL = 15kΩ tied to GND 170 mVpp FM demodulator section VDEM Output voltage +-75kHz FM deviation typical application schematic, ZL = 4kΩ 700 800 900 mVRMS ZDEM_OUT Output impedance 100 Ω Squelch section ATT Audio attenuation on each receiver when audio buffers are muted. RX1 and RX2 audio buffers muted, ZL = 16Ω on both audio buffers 55 65 dB ZN_IN Noise amplifier input impedance 2 k Ω VN_TH Comparator threshold from muted to unmuted state Rmute = 22kΩ, fIN = 100kHz 9mVRMS VN_HYS Comparator hysteresis Rmute = 22kΩ, fIN = 100kHz 1 mVRMS Imute_sink Current sinks on pin 25 to discharge Cmute capacitor: ramp generator controlling the attenuation from ON to OFF states of audio buffers. Voltage on pin 25 = 1.7V 24 µA Imute_source Current sources on pin 25 to charge Cmute capacitor: ramp generator controlling the attenuation from OFF to ON states of audio buffers. Voltage on pin 25 = 1.7V 14 µA Audio buffers ZOD-IN Input impedance 200 k Ω BW1dB -1dB bandwidth ZL = 16Ω 35 kHz POUT_OD Output power ZL= 16Ω, VOD_IN=70mVRMS 15 20 mW THDOD Distortion in line driver mode Vout = 0.5 VRMS, ZL= 10kΩ 0.2 0.3 % Table 4. VCC = 2.7V, Tamb = 25°C, faudio = 1kHz, fcarrier = 2.8MHz, frequency deviation = +/-75kHz (unless otherwise specified) (continued) Symbol Parameter Test conditions Min Typ Max Unit |
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