- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄372178 > SP322 Programmable V.11/V.35 Transceiver PDF資料下載
參數(shù)資料
| 型號(hào)： | SP322 |
| 英文描述： | Programmable V.11/V.35 Transceiver |
| 中文描述： | 可編程V.11/V.35收發(fā)器 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大小： | 318K |
| 代理商： | SP322 |
Rev. 7/9/03
SP322 V.11/V.35 Serial Transceiver
10
Copyright 2003 Sipex Corporation
THEORY OF OPERATION
The
SP322
is a programmable V.11 or V.35
transceiver IC. It contains three driver and three
receivers which can be configured to either V.11
or V.35 physical layer electrical characteristics.
The transceivers within the
SP322
include all
the necessary termination resistor networks
required for compliant V.11 and V.35 signals.
This simplifies serial port designs using V.11 or
V.35 where the engineer does not have to
configure V.11 cable termination resistors and
the V.35 network.
The
SP322
contains four basic blocks: the
charge pump, differential drivers, differential
receivers, termination network circuitry. Each
block is described in the following.
Charge–Pump
The
SP322
charge pump is smaller version of
the
Sipex
–patented design (U.S. 5,306,954).
The charge pump still requires four external
capacitors and uses a four–phase voltage shift-
ing technique to attain symmetrical 10V power
supplies. But the pump is only used for provid-
ing internal biasing for the transceivers and the
termination circuitry. The V
and V
outputs
provide only 3mA of output current and should
not be connected to bias other external circuitry.
Recommended charge pump capacitor values
are 1
μ
F or greater. The internal oscillator pro-
vides a clock rate for the charge pump which
typically operates at 15kHz.
Drivers
The
SP322
has three differential drivers. There
are two types of drivers includes within the
SP322
: V.11 drivers and V.35 drivers.
When configured in V.11 mode, the V.11 driv-
ers produce a differential output compliant with
the V.11 and RS-422 electrical specifications.
This includes the all the DC electrical param-
eters such as V
, V
, V
, etc. The strength of
the SP322 drivers allow them to also drive
signals per the RS-485 standard. The V
mini-
mum of
±
1.5V is provided by the driver output
given a load of 54
as opposed to
±
2.0V with a
100
load for RS-422. However, the drivers are
not intended to operate over the RS-485 com-
mon mode range of +12V to -7V. The common
mode range for the V.11 drivers is +7V to -7V
which is in accordance to the ITU V.11 specifi-
cation.
When in V.35 mode, the drivers provide V.35
signals compliant to the ITU V.35 electrical
specification. Specifically, the V.35 driver is
designed to supply a differential output of
±
0.55V
with an offset of less than 0.6V. With
Sipex's
patent-pending V.35 driver design, the driver
also adheres to impedance measurements such
as driver output source impedance (100
±
50
)
and driver output short-circuit impedance (150
±
15
). Traditional V.35 drivers require a resis-
tor network to provide the proper V.35 imped-
ance specifications for the driver outputs. The
SP322
V.35 driver does this without the aid of
any external components attached to the driver
output. Its unique design contains internal
resistance matching and switching to provide
compliant V.35 signals.
Each driver includes an enable pin for added
convenience. The driver enable pins are low
active and will tri-state the driver outputs if a
logic "1" is applied. During this state, the drivers
are high impedance. The enable pins include a
pull-down resistor so that the pin can be
unconnected where the driver will always be
enabled. Regardless of physical protocol, the
drivers can operate to at least 10Mbps.
Receivers
The
SP322
has three differential receivers which
are used for either V.11 or V.35. The receivers
have a 200mV sensitivity and operate over the
common mode range of +7V to -7V. The
receiver itself is the same in either V.11 or V.35
mode. The receiver input termination is config-
ured differently for each mode (V.11/V.35 pin).
The receivers also include enable pins for con-
venience. The receiver enable pins are high
active where a logic "0" will tri-state the re-
ceiver outputs. During tri-state, the receiver
inputs are approximately 12k
. Any termina-
tion associated with the operating mode is dis-
connected during tri-state of that receiver. The
receiver enable pins have a pull-up resistor that
allows the pins to be unconnected. The receiver
will always be active in this case. The differen-
tial receiver can operate to at least 10Mbps.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP322CF | Programmable V.11/V.35 Transceiver |
| SP3238EEEY-L | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP3238EEEA-L | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP3238EE | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP3238EEEA | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP322_05 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Programmable V.11/V.35 Transceiver |
| SP3220 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+3.0V to +5.5V RS-232 Driver/Receiver Pair |
| SP3-2-20 | 制造商:RHOMBUS-IND 制造商全稱:Rhombus Industries Inc. 功能描述:SP3 Series Mini-SIP Passive Delay Modules |
| SP3220B | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Speed +3.0V to +5.5V RS-232 Driver/Receiver Pair |
| SP3220BCA | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Speed +3.0V to +5.5V RS-232 Driver/Receiver Pair |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。