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参数资料
| 型号： | LTC2803IGN-1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | Buffer和线驱动 |
| 英文描述： | 1.8V to 5.5V RS-232 Single and Dual Transceivers; Package: SSOP; No of Pins: 16; Temperature Range: -40°C to +85°C |
| 中文描述： | DUAL LINE TRANSCEIVER, PDSO16 |
| 封装： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件页数： | 2/16页 |
| 文件大小： | 659K |
| 代理商： | LTC2803IGN-1 |
10
2801234f
LTC2801/LTC2802/
LTC2803/LTC2804
APPLICATIO S I FOR ATIO
WU
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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 10μH inductor (L1) and a
bypass capacitor (C4) of at least 1μF. The recommended
size for the charge pump capacitor (C1) is 220nF and for
the storage capacitors (C2 and C3) is 1μF. Larger storage
capacitors up to 4.7μF 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.
BOOST
REGULATOR
VEE
VDD
C3
1
F
C2
1
F
CAP
SW
C1
220nF
L1
10
H
VCC
C4
1
F
C5
220nF
*OMIT IF VL IS CONNECTED TO VCC
*
VL
1.8V TO 5.5V
2801F06
Figure 6. DC/DC Converter and Recommended Bypassing
VL Logic Supply
A separate logic supply pin VL allows the LTC2801 family to
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
5.5V and sequence in any order. If VL is powered separately
from VCC, bypass VL with a 220nF capacitor (C5).
ANY VOLTAGE FROM
1.8V TO 5.5V
ANY VOLTAGE FROM
1.8V TO 5.5V
VL
VCC
EXTERNAL
DEVICE
RS-232
2801F07
Figure 7. VCC and VL Are Independent
Power-Saving Modes
When the DC-DC converter and drivers are turned off (PS or
ON/OFF = logic low), VCC supply current is reduced to 1μA.
Tables 1 and 2 summarize the modes for each device.
In Shutdown mode, VL supply current is reduced to 1μA,
and both receiver and driver outputs assume a high im-
pedance state.
In Receivers Active mode, the quiescent VL supply current
is reduced to 15μA 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),
MODE serves as a low-latency driver enable for half-duplex
operation. Each driver is enabled and disabled in less than
2μs, 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 conguration typically
minimizes conversion loss while providing compatibility
with system logic levels.
Inductor Selection
A 10μH 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.
相关PDF资料 |
PDF描述 |
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| LTC2804CDHC | 1.8V to 5.5V RS-232 Single and Dual Transceivers; Package: DFN; No of Pins: 16; Temperature Range: 0°C to +70°C |
| LTC2804IDHC | 1.8V to 5.5V RS-232 Single and Dual Transceivers; Package: DFN; No of Pins: 16; Temperature Range: -40°C to +85°C |
| LTC2844CG#TR | 3.3V Software-Selectable Multiprotocol Transceiver; Package: SSOP; No of Pins: 28; Temperature Range: 0°C to +70°C |
| LTC2844IG#TR | 3.3V Software-Selectable Multiprotocol Transceiver; Package: SSOP; No of Pins: 28; Temperature Range: -40°C to +85°C |
| LTC2844IG | 3.3V Software-Selectable Multiprotocol Transceiver; Package: SSOP; No of Pins: 28; Temperature Range: -40°C to +85°C |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC2803IGN-1#PBF | 功能描述:IC TXRX RS232 DUAL 16-SSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LTC2803IGN-1#TRPBF | 功能描述:IC TXRX RS232 DUAL 16-SSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LTC2804CDHC | 制造商:Linear Technology 功能描述:MS-Interface, 1.8V-5V 2D+2R 1Mbps RS232 Transceiver w/ Driver Disable |
| LTC2804CDHC#PBF | 功能描述:IC TXRX RS232 DUAL 16-DFN RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:121 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:3 V ~ 3.6 V 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-DFN（3x3） 包装:管件 |
| LTC2804CDHC#TR | 制造商:Linear Technology 功能描述:MS-Interface, 1.8V-5V 2D+2R 1Mbps RS232 Transceiver w/ Driver Disable |
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