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參數(shù)資料
| 型號(hào)： | ADM1345 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Single Supply V.35 Transceiver(單電源RS-422/RS-485收發(fā)器,可發(fā)送和接收差分時(shí)鐘和數(shù)據(jù)信號(hào)) |
| 中文描述： | 單電源.35收發(fā)器（單電源RS-422/RS-485收發(fā)器，可發(fā)送和接收差分時(shí)鐘和數(shù)據(jù)信號(hào)） |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 338K |
| 代理商： | ADM1345 |
ADM1345
Preliminary Technical Information
REV. A
8
CHARGE PUMP
A negative supply voltage is required to achieve the negative
portion of the transmitter output common-mode range.
This is achieved by a charge-pump voltage-doubler/inverter.
+
1
m
F
10V
1
m
F
6.3V
1
m
F
10V
1
m
F
10V
ADM1345
V
CC
+5V
+
+
+
1
2
3
4
27
28
Figure 16. Connection of Charge Pump Capacitors
The charge pump requires 3, 1
μ
F capacitors, and the the
5V supply should also be decoupled with a 1
μ
F capacitor
close to the V
CC
pin More details about charge pump
capacitors and supply decoupling are given in the
Applications Information.
ESD PROTECTION
The receiver inputs and transmitter outputs of the
ADM1345 have built-in protection against repeated
electrostatic discharge (ESD) transients of up to ±10kV. As
the ESD protection depends on clamping the transient to
V
CC
or V
EE
by on-chip diodes, the impedance seen at these
pins must be low, which means that capacitors with low
equivalent series resistance (ESR) must be used on these
pins.
ESD testing is carried out using the Human Body Model.
APPLICATIONS INFORMATION
CHARGE PUMP CAPACITORS AND SUPPLY
DECOUPLING
For proper operation of the charge pump, the capacitors
should have an equivalent series resistance (ESR) less than
1
. As the charge pump draws current pulses from V
CC
, the
V
CC
decoupling capacitor should also have low ESR. The
V
CC
decoupling capacitor and V
EE
reservoir capacitor
should also have low ESR because they determine how
effectively ESD pulses are clamped to V
CC
or V
EE
by the on-
chip clamp diodes. Tantalum or monolithic ceramic
capacitors are suitable for these components. If using
tantalum capacitors, do not forget to observe polarity.
CABLE TERMINATION
Both the transmitter and receiver end of the cable
connected between ADM1345s must be properly and
identically terminated. Termination requires a differential
resistance of 100
between the transmitter outputs (or
receiver inputs) and a common-mode resistance of 150
to
ground to allow common-mode current to flow if the
transmitter and receiver grounds are at different potentials.
50
W
50
W
125
W
RX#
A#
B#
50
W
50
W
125
W
TX#
Y#
Z#
TWISTED PAIR CABLE
RX#
A#
B#
300
W
300
W
120
W
TX#
Y#
Z#
120
W
300
W
300
W
Figure 17. Termination Networks
This requirement can be met using either a Y network or an
equivalent D network, as shown in figure 18. Standard 1/
8W surface mount or through-hole resistors may be used
but resistor tolerance should be 5% or better to maintain
the proper differential output swing. Alternatively, a
complete package containing 5 terminating networks in a
14-pin SO-IC or DIP can be obtained from:
BI Technologies (Formerly Beckman Industrial)
Resistor Networks,
4200 Bonita Place
Fullerton, CA 92635
Phone: (714) 447-2357 Fax: (714) 447 2500
Part #:
BI Technologies 627T500/1250 (SOIC)
BI Technologies 899TR50/125 (DIP)
DCE/DTE PORT APPLICATION
The ADM1435 is ideally suited for implementation of a
Data Terminal Equipment (DTE) or Data Circuit
Terminating Equipment (DCE) port. Figure 18 (facing
page) shows a complete V.35 DTE/DCE interface using
only two ICs, one terminating resistor network, and 9
capacitors for each side of the interface. The ADM1345 is
used to transmit and receive the high-speed data and clock
signals, while the ADM208Es are used for the lower speed
control signals.
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| ADM1385ARS-REEL | 制造商:Analog Devices 功能描述:Dual Transmitter/Receiver RS-232 20-Pin SSOP T/R 制造商:Rochester Electronics LLC 功能描述:LOW POWER, 3V, RS-232 I.C. - Tape and Reel |
| ADM1385ARS-REEL7 | 制造商:Analog Devices 功能描述:Dual Transmitter/Receiver RS-232 20-Pin SSOP T/R |
| ADM1385ARSZ | 功能描述:IC TXRX RS-232 HI-SP 3.3V 20SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:RS-232 & USB Transceiver 標(biāo)準(zhǔn)包裝:2,000 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):1/1 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱:296-19849-2 |
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