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参数资料
| 型号： | LTC2847IUHF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 2/20页 |
| 文件大小： | 0K |
| 描述： | IC TXRX MULTIPROTOCOL 38-QFN |
| 标准包装： | 2,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 3/3 |
| 规程： | 多协议 |
| 电源电压： | 5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 供应商设备封装： | 38-QFN（5x7） |
| 包装： | 带卷 (TR) |
10
LTC2847
sn2847 2847fs
Figure 15. V.28 Driver Propagation Delays
Figure 16. V.28 Receiver Propagation Delays
SWITCHI G TI E WAVEFOR S
UW
W
APPLICATIO S I FOR ATIO
WU
UU
3V
0V
1.5V
0V
–3V
3V
1.5V
0V
3V
–3V
tPHL
tf
VO
–VO
D
A
tPLH
tr
2847 F15
SR = 6V
tf
SR = 6V
tr
VIH
VIL
1.5V
1.65V
1.5V
1.65V
tPHL
VOH
VOL
A
R
tPLH
2847 F16
Overview
The LTC2847 consists of a charge pump and a 3-driver/
3-receiver transceiver. The 5V VCC input powers the charge
pump and transceiver. The charge pump generates the
VDD and VEE supplies. The LTC2847’s VDD and VEE
supplies can be used to power a companion chip like the
LTC2845. The VIN input powers the digital interface in-
cluding the receiver output drivers. Having a separate pin
to power the digital interface allows the flexibility of
controlling the receiver output swing to interface with 5V
or 3.3V logic.
The LTC2847 and LTC2845 form a complete software-
selectable DTE or DCE interface port that supports the
RS232, RS449, EIA530, EIA530-A, V.35, V.36 and X.21
protocols. Cable termination is provided on-chip, elimi-
nating the need for discrete termination designs.
A complete DCE-to-DTE interface operating in EIA530
mode is shown in Figure 17. The LTC2847 half of each port
is used to generate and appropriately terminate the
clock and data signals. The LTC2845 is used to generate
the control signals along with LL (local loopback),
RL (Remote Loop-Back), TM (Test Mode) and RI (Ring
Indicate).
Mode Selection
The interface protocol is selected using the mode select
pins M0, M1 and M2 (see Table 1).
For example, if the port is configured as a V.35 interface,
the mode selection pins should be M2 = 1, M1 = 0, M0 = 0.
For the control signals, the drivers and receivers will
operate in V.28 (RS232) electrical mode. For the clock and
data signals, the drivers and receivers will operate in V.35
electrical mode. The DCE/DTE pin will configure the port
for DCE mode when high, and DTE when low.
The interface protocol may be selected simply by plugging
the appropriate interface cable into the connector. The
mode pins are routed to the connector and are left uncon-
nected (1) or wired to ground (0) in the cable as shown in
Figure 18. The internal pull-up current sources will ensure
a binary 1 when a pin is left unconnected.
The mode selection may also be accomplished by using
jumpers to connect the mode pins to ground or VIN.
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