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參數(shù)資料
| 型號(hào)： | LTC2803CGN-1#PBF |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 2/18頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS232 DUAL 16-SSOP |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 2/2 |
| 規(guī)程： | RS232 |
| 電源電壓： | 1.8 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 管件 |
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LTC2801/LTC2802/
LTC2803/LTC2804
0
2801234fe
BOOST
REGULATOR
VEE
VDD
C3
1F
C2
1F
CAP
SW
C1
220nF
L1
10H
VCC
C4
1F
C5
220nF
*OMIT IF VL IS CONNECTED TO VCC
*
VL
1.8V TO 5.5V
2801 F06
aPPlicationS inForMation
Overview
The LTC2801 family of RS-232 transceivers operates on
a VCC supply of 1.8V to 5.5V, utilizing a switching regula-
tor to generate the necessary higher voltage rails for the
drivers. The transceivers interface with logic operating
on any supply from 1.8V to 5.5V, independent of the VCC
voltage. Depending on the device, one or two control pins
are available to invoke Shutdown, Receiver Active and
Driver Disable features.
DC-DC Converter
The on-chip DC-DC converter operates from the VCC
input, generating a 7V VDD supply and a charge pumped
–6.3V VEE supply, as shown in Figure 6. VDD and VEE
power the output stage of the drivers and are regulated
to levels that guarantee greater than
±5V output swing.
The DC-DC converter requires a 10H inductor (L1) and
a bypass capacitor (C4) of at least 1F. The recommended
size for the charge pump capacitor (C1) is 220nF and for
the storage capacitors (C2 and C3) is 1F. Larger storage
capacitors up to 4.7F may be used if C1 is kept at 20% to
50% their size and C4 is also scaled. Locate C1-C4 close
to their associated pins.
Power-Saving Modes
When the DC-DC converter and drivers are turned off (PS
and MODE or ON/OFF = logic low), VCC supply current is
reduced to 1A. Tables 1 and 2 summarize the modes for
each device.
In Shutdown mode, VL supply current is reduced to 1A,
and both receiver and driver outputs assume a high im-
pedance state.
In Receivers Active mode, the quiescent VL supply current
is reduced to 15A and the driver outputs assume a high
impedance state. The receivers operate at a reduced rate
(typically 100 kbps) with hysteresis turned off.
Half-Duplex Operation
When the DC-DC converter is kept on (PS = logic high),
MODEservesasalow-latencydriverenableforhalf-duplex
operation. Each driver is enabled and disabled in less than
2s, while each receiver remains continuously active. This
mode of operation is illustrated in Figures 15-17.
Battery Operation
To maximize battery life, connect VCC (and L1) directly to
the unregulated battery voltage and VL to the regulated
supply, as shown in Figure 22. This configuration typically
minimizes conversion loss while providing compatibility
with system logic levels.
Inductor Selection
A 10H inductor with a saturation current (ISAT) rating
of at least 200mA and low DCR (copper wire resistance)
is recommended. Some small inductors meeting these
requirements are listed in Table 3.
Figure 6. DC/DC Converter and Recommended Bypassing
VL Logic Supply
AseparatelogicsupplypinVLallowstheLTC2801familyto
interface with any logic signal from 1.8V to 5.5V, as shown
in Figure 7. Simply connect the desired logic supply to
VL. There is no interdependency between VCC and VL; they
may simultaneously operate at any voltage from 1.8V to
5.5Vandsequenceinanyorder.IfVLispoweredseparately
from VCC, bypass VL with a 220nF capacitor (C5).
Figure 7. VCC and VL Are Independent
ANY VOLTAGE FROM
1.8V TO 5.5V
ANY VOLTAGE FROM
1.8V TO 5.5V
VL
VCC
EXTERNAL
DEVICE
RS-232
2801 F07
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