參數(shù)資料
型號: 73M1903C-IM/F
廠商: Maxim Integrated Products
文件頁數(shù): 36/48頁
文件大小: 0K
描述: IC MODEM AFE MULTIREGIONAL 32QFN
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 490
通道數(shù): 2
電壓 - 電源,模擬: 3 V ~ 3.6 V
電壓 - 電源,數(shù)字: 3 V ~ 3.6 V
封裝/外殼: 32-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 32-QFN(5x5)
包裝: 管件
DS_1903C_033
73M1903C Data Sheet
Rev. 5.0
41
When both drivers are used for worldwide applications, the recommended connections are shown below.
The termination realized when the primary driver is selected is 2R1 + Rwtot;
With the secondary driver is selected it is 2Z4 + Rwtot.
TXAP1
RXAP
R1
R3
Z4
R1
R2
R3
R2
R3
ZL
RW
C1
TXAN1
TXAP2
TXAN2
RXAN
Figure 19: Dual transmitter arrangement
Still keep R2 + R3 = 100K.
R3
100K
1
Rwtot
600
+
Rwtot
600
+
1200
+
and
R2 100 K
R3.
The R3 resistors will be much larger than for the case when only a single transmitter is used since the
impedance needed to cancel the transmit signal in the receiver is now supplied by two R3 resistors in
parallel instead of only one. This means the resistors will be approximately twice the ratio values in the
previous case.
Trans-Hybrid Loss (THL)
Trans-Hybrid Loss is by definition the loss of transmit signal from Tip/Ring to the receive inputs on the
modem IC. This definition is only valid when driving a specific phone line impedance. In reality, phone
line impedances are never perfect, so this definition isn’t much help. Instead, as an alternate definition
that helps in analysis for this modem design, THL is the loss from the transmit pins to the receive pins.
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