参数资料
型号: LT1714IGN#TR
厂商: Linear Technology
文件页数: 3/16页
文件大小: 0K
描述: IC COMP R-R I/O DUAL LP 16SSOP
标准包装: 2,500
系列: UltraFast™
类型: 带锁销
元件数: 2
输出类型: CMOS,补充型,满摆幅,TTL
电压 - 电源,单路/双路(±): 2.4 V ~ 12 V,±2.4 V ~ 6 V
电压 - 输入偏移(最小值): 4mV @ 5V
电流 - 输入偏压(最小值): 2µA @ 5V
电流 - 输出(标准): 20mA
电流 - 静态(最大值): 7.5mA
CMRR, PSRR(标准): 70dB CMRR,80dB PSRR
传输延迟(最大): 11ns
磁滞: 100mV
工作温度: -40°C ~ 85°C
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
安装类型: 表面贴装
包装: 带卷 (TR)
11
LT1713/LT1714
TYPICAL APPLICATIO S
U
Simultaneous Full Duplex 75Mbaud Interface
with Only Two Wires
The circuit of Figure 3 shows a simple, fully bidirectional,
differential 2-wire interface that gives good results to
75Mbaud, using the LT1714. Eye diagrams under condi-
tions of unidirectional and bidirectional communication
are shown in Figures 4 and 5. Although not as pristine as
the unidirectional performance of Figure 4, the perfor-
mance under simultaneous bidirectional operation is still
excellent. Because the LT1714 input voltage range ex-
tends 100mV beyond both supply rails, the circuit works
with a full
±3V (one whole VS up or down) of ground
potential difference.
The circuit works well with the resistor values shown, but
other sets of values can be used. The starting point is the
characteristic impedance, ZO, of the twisted-pair cable.
The input impedance of the resistive network should
match the characteristic impedance and is given by:
RR
R
RR
R
IN
O
=
+
++
[]
2
12
3
21
2
3
||(
)
||(
)
This comes out to 120
for the values shown. The
Thevenin equivalent source voltage is given by:
VV
RR
R
RRR
R
RR
R
TH
S
O
=
+
++
[]
(–
)
()
||(
)
23
1
23
1
21
2
3
+
1/2
LT1714
TxD
RxD
7
8
9
LE
6
5
49.9
750k
100k
49.9
2
1
15
3
16
13
14
3V
4
11
12
R2A
2.55k
R3A
124
ROA
140
ROB
140
R1B
499
6-FEET
TWISTED PAIR
ZO ≈ 120
R1D
499
R1C
499
R3B
124
R2C
2.55k
3V
100k
5
11
2
1
12
6
10
9
8
7
171314 F03
14
3
15
16 13
4
TxD
RxD
3V
R3C
124
R3D
124
R2D
2.55k
R2B
2.55k
R1A
499
10
+
1/2
LT1714
LE
+
750k
49.9
49.9
100k
+
LE
1/2
LT1714
LE
1/2
LT1714
3V
DIODES: BAV99
×4
Figure 3. 75Mbaud Full Duplex Interface on Two Wires
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