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| 型號： | 73M1903-IM |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, QCC32 |
| 封裝： | QFN-32 |
| 文件頁數(shù)： | 31/45頁 |
| 文件大小： | 449K |
| 代理商： | 73M1903-IM |
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73M1903
Modem Analog Front End
DATA SHEET
Page: 37 of 45
2005 TERIDIAN Semiconductor Corporation
Rev 1.4
APPENDIX A
73M1903 DAA Resistor Calculation Guide
The following procedure can be used to approximate the component values for the DAA. The optimal
values will be somewhat different due to the effects of the reactive components in the DAA (this is a DC
approximation). Simulations with the reactive components accurately modeled will yield optimal values.
The procedures for calculating the component values in the DAA are as follows. First set up R1. The
DAA should be designed to reflect 600 when looking in at TIP/RING. If the transformer is 1 to 1, the
holding coil and ring detect circuit are high impedance, Cblock is a high value so in the frequency band of
interest it is negligible, the sum of R2 and R3 is much greater than R1, and the output impedance of the
drivers driving TXAP/TXAN are low then:
Rin 2 R1
.
RW Rohswitch
2 Rbead
.
RW is the sum of the winding resistance of both sides of the transformer. Measure each side of the
transformer with an Ohmmeter and sum them.
Rohswitch is the on resistance of the Off Hook Switch. Mechanical Relay switches can be ignored, but
Solid State Relays sometimes have an appreciable on resistance.
Rbead is the DC resistance of whatever series RF blocking devices may be in the design.
For Rin equal to 600 :
R1
600 RW Rohswitch
2 Rbead
.
2
To maximize THL (Trans-Hybrid Loss), or to minimize the amount of transmit signal that shows up back
on the Receive pins. The RXAP/RXAN pins get their DC bias from the TXAP/TXAN pins. By capacitively
coupling the R3 resistors with the C1 caps, the DC offset can be minimized from the TXAP/TXAN to the
RXAP/RXAN because the DC offset will be divided by the ratio of the R1 resistors to the winding
resistance on the one side of the transformer.
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| 73M1903-IM/F | 功能描述:電信線路管理 IC Modem AFE V.22Bis-V.92 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| 73M1903-IM/F1 | 功能描述:電信線路管理 IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| 73M1903-IMR/F | 功能描述:電信線路管理 IC Modem AFE V.22Bis-V.92 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| 73M1903-IMR/F1 | 功能描述:電信線路管理 IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| 73M1903-IVT/F | 功能描述:IC MODEM AFE V.22BIS 20-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模擬前端 (AFE) 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):- 通道數(shù):2 功率（瓦特）:- 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:帶卷 (TR) |
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