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STB4395 bảng dữ liệu(PDF) 6 Page - STMicroelectronics |
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STB4395 bảng dữ liệu(HTML) 6 Page - STMicroelectronics |
6 / 16 page 1 - PIN DESCRIPTION (continued) 1.4- Digital, Signal and Control Pins Pin Symbol Description Polarity 18 DO Receive Data Output 20 FSH Data Slicer Time Constant Setting (Fast/Slow/Hold) High: slow, tri-state: fast, low: hold DO goes high on hold (see next table) 9 FN Forces Data Slicer Reference Time Constant to fast (STB4395A only) low: fast (overides FSH) high: fast, slow or hold (set by FSH) 5 LOCK VCO lock detect-all 3 PLL high for LOCK (all three PLL’s) 3 PRGD Serial Synthesizer Data Input, 16 bits word high for logic 1. Input sequence: LO, D14, D13,...,D0. D14 is the MSB. LO: logic 1 is low transmit power. 1 NPRGEN Serial Synthesizer Data Enable low to enable PRGD buffer 2 PRGCLK Serial Data Clock held high when no clocking, clocks in data on positive edge 10 EN Power Down all functions except Enable Buffer high for power up, low for standby 4 NTXEN Receive-Transmit Switch high for receive, low for transmit The time constant of the data slicer is set through the pins FSH and FN for the STB4395A and through FSH only for the STB4395(FN internally connected to High), as listed in the following table : PIN FN High Low FSH High Slow, DO active Fast, DO active TriState Fast, DO active Fast, DO active Low Hold, DO high Fast, DO high 1.5 - Power Supply Pins Pin Symbol Description 64 VND Negative supply for digital regulators, digital input and output buffers 48 VNIF Negative supply for IF regulators, data output buffer 11 VNOSC Negative supply for the oscillator regulators + substrate 49 VNRF Negative supply RF regulators, quadrature input buffers 53 VNPA Negative supply for PA 62 VPD Positive supply for digital circuitry 32 VPI Positive supply for receive oscillator + charge pump 45 VPIF Positive supply for RX IF + baseband sections 17 VPO Positive supply for transmit oscillator + charge pump 54, 57 VPRF1 / VPRF2 Positive supplies for RF front end 23, 26 VPS1/ VPS2 Positive supplies for ch. select oscillator + charge pump 63 VRD Regulated negative supply for digital circuitry 36 VRI Regulated negative supply for receive oscillator + charge pump 38 VRIF Regulated negative supply for RX IF + baseband sections 13 VRO Regulated negative supply for transmit oscillator + charge pump 52 VRRF Regulated negative supply for RF front end 22 VRS Regulated negative supply ch. select oscillator + charge pump STB4395 6/16 |
Số phần tương tự - STB4395 |
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Mô tả tương tự - STB4395 |
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