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| 型号： | MAX3172EAI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/19页 |
| 文件大小： | 0K |
| 描述： | IC TERM/TXRX MULTIPROT 28-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 3.6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 带卷 (TR) |
MAX3172/MAX3174
+3.3V Multiprotocol Software-Selectable
Cable Terminators and Transceivers
______________________________________________________________________________________
13
In Figure 9, the MAX3172/MAX3174 are used to imple-
ment the resistive T-network that is needed to properly
terminate the V.35 driver and receiver. Internal to the
MAX3172/MAX3174, S1 and S2 are closed to connect
the T-network resistors to the circuit. The V.28 termina-
tion resistor, internal to the MAX3170, is disabled by
opening S3 to avoid interference with the T-network
impedance.
The V.35 specification allows for ±4V of ground differ-
ence between the V.35 generator and V.35 load. The
V.35 data rates may be as high as 10Mbps. The
MAX3172/MAX3174 maintain correct terminal imped-
ances over these conditions.
V.35 EMI Reduction
For applications where EMI reduction is especially
important, the MAX3172/MAX3174 termination net-
works provide a pin for shunting common-mode driver
currents to GND (Figure 10). Mismatches between A
and B driver output propagation delays create a com-
mon-mode disturbance on the cable. This common-
mode energy can be shunted to GND by placing a
100pF capacitor (C1 to GND) from the center point of
the T-network termination (R1C, R2C, and R3C).
V.28 Termination
Most industry-standard V.28 receivers (including the
MAX3170) do not require external termination because
the receiver includes an internal 5k termination resis-
tor. When the MAX3172/MAX3174 are placed in V.28
mode, all five of the termination networks are placed in
a high-Z mode. In high-Z mode, the MAX3172/
MAX3174 termination networks will not interfere with the
MAX3170's internal 5k termination.
Figure 9. V.35 Termination and Internal Resistance Networks
R6
10k
R8
5k
R3
127
R2
52
R1
52
A′
B′
C′
A
B
GND
R5
30k
R7
10k
R4
30k
MAX3172
MAX3174
MAX3170
S3
S2
S1
RECEIVER
Figure 10. V.35 Driver
R3
127
R2
52
R1
52
A
B
C(GND)
MAX3172
MAX3174
S1
S2
C1
100pF
DRIVER
R_C
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