參數(shù)資料
型號: MAX3172CAI
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 通用總線功能
英文描述: Quad LVDS Receiver 16-TSSOP -40 to 85
中文描述: LINE TRANSCEIVER, PDSO28
封裝: 5.30 MM, MO-150, SSOP-28
文件頁數(shù): 13/19頁
文件大?。?/td> 276K
代理商: MAX3172CAI
M
+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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