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參數(shù)資料
| 型號： | SP3508 |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | Cermet Potentiometer; Resistance Max:50kohm; Resistance Tolerance:+/- 10 %; Power Rating:1W; Voltage Rating:350V; Series:149; Temperature Coefficient:+/-150 ppm; Resistor Element Material:Cermet; Leaded Process Compatible:Yes |
| 中文描述： | 堅固3.3，20Mbps的，8通道多協(xié)議收發(fā)器，具有可編程DCE的/ DTE和終端電阻 |
| 文件頁數(shù)： | 24/33頁 |
| 文件大?。?/td> | 313K |
| 代理商： | SP3508 |
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24
Date: 06/14/04
SP3508 Enhanced WAN Multi–Mode Serial Transceiver Copyright 2004 Sipex Corporation
The same receivers also incorporate a termination
network internally for V.35 applications. For
V.35, the receiver input termination is a “Y”
termination consisting of two 51
resistors
connected in series and a 124
resistor connected
between the two 50
resistors and GND. The
receiver itself is identical to the V.11 receiver.
The differential receivers can be configured to
be ITU-T-V.10 single-ended receivers by
internally connecting the non-inverting input to
ground. This is internally done by default from
the decoder. The non-inverting input is rerouted
to V10GND and can be grounded separately.
The ITU-T-V.10 receivers can operate over
120Kbps and are used in RS-449/V.36, E1A-
530, E1A-530A and X.21 modes as Category II
signals as indicated by their corresponding
specifications. All receivers include an enable/
disable line for disabling the receiver output
allowing convenient half-duplex configurations.
The enable pins will either enable or disable the
output of the receivers according to the
appropriate active logic illustrated on
Figure 44
.
The receiver’s enable lines include an internal
pull-up or pull-down device, depending on the
active polarity of the receiver, that enables the
receiver upon power up if the enable lines are left
floating. During disabled conditions, the receiver
outputs will be at a high impedance state. If the
receiver is disabled any associated termination is
also disconnected from the inputs.
FEATURES
All receivers include a fail-safe feature that
outputs a logic high when the receiver inputs are
open, terminated but open, or shorted together.
For single-ended V.28 and V.10 receivers, there
are internal 5k
pull-down resistors on the inputs
which produces a logic high (“1”) at the receiver
outputs. The differential receivers have a
proprietary circuit that detect open or shorted
inputs and if so, will produce a logic HIGH (“1”)
at the receiver output.
CHARGE PUMP
SP3508 uses an internal capacitive charge pump
to generate Vdd and Vss. The design is Sipex
patented (5,306,954) four-phased voltage shift-
ing charge pump converters that converts the
input voltage of 3.3V to nominal output volt-
ages of +/-6V (Vdd & Vss1). SP3508 also in-
cludes an inverter block that inverts Vcc to -Vcc
(Vss2). There is a free-running oscillator that
controls the four phases of the voltage shifting.
A description of each phase follows.
4-phased doubler pump
Phase 1
-V
SS1
charge storage -During this phase of the
clock cycle, the positive side of capacitors C1
and C2 are initially charged to V
CC
. C1+ is then
switched to ground and the charge in C1- is
transferred to C2-. Since C2+ is connected to
V
CC
, the voltage potential across capacitor C2 is
now 2xV
CC
.
V
CC
= +3V
–3V
–3V
+3V
V
SS1
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
+
+
+
+
–
–
–
–
C
VDD
C
VSS1
Figure 45. Charge Pump - Phase 1.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP3508CF | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP3508CF-L | 功能描述:外圍驅(qū)動器與原件 - PCI 3.3V 20MBPS 8CH PROG DCE/DTE RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| SP3508EB | 功能描述:LIN 收發(fā)器 20Mbps Multiprotocol Transceiver 8Ch 3.3V RoHS:否 制造商:NXP Semiconductors 工作電源電壓: 電源電流: 最大工作溫度: 封裝 / 箱體:SO-8 |
| SP3508EF | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Rugged 3.3V, 20Mbps, 8 Channel Multiprotocol Transceiver with Programmable DCE/DTE and Termination Resistors |
| SP3508EF-L | 功能描述:外圍驅(qū)動器與原件 - PCI 20MBPS 8CH MULTI 0-70C RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
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