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STB4395 bảng dữ liệu(PDF) 6 Page - STMicroelectronics

tên linh kiện STB4395
Giải thích chi tiết về linh kiện  CT2 RECEIVER/TRANSMITTER
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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STB4395 bảng dữ liệu(HTML) 6 Page - STMicroelectronics

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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


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