參數(shù)資料
型號: 73M1903-EVM-ETSI
廠商: Maxim Integrated Products
文件頁數(shù): 36/47頁
文件大小: 0K
描述: BOARD DEMO 73M1903 ETSI 203IMPED
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 1
主要目的: 接口,模擬前端(AFE)
已用 IC / 零件: *
主要屬性: *
次要屬性: *
已供物品: *
DS_1903_032
73M1903 Data Sheet
Rev. 2.1
41
R3
100 K
1
Rwtot
600
1200
where
Rwtot RW
Rohswitch
2 Rbead
.
R2 100 K
R3
Use 1% resistors for R1, R2, and R3.
To select the value for C1, make the zero at around 10 Hz.
1
2
π
. 100
.
K C1
.
10
C1
1
2
π
. 100
.
K 10
.
C1 0.15 uF
The blocking cap Cblock should also have the same frequency response, but due to the low impedance,
its value will be much higher, usually requiring a polarized cap. A blocking cap may also be needed on
the modem side of the transformer if the DC offset current of the transmit pins will exceed the current
rating for a dry transformer circuit.
Cblock
1
2
π
. 600
.
10
.
Cblock 27 uF
If you are using a Wet transformer design, as in the following figure:
The only difference is that the blocking capacitor, Cblock, it is removed. All other equations still hold true.
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 of 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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