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參數(shù)資料
| 型號： | 73M1903C-IMR/F |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 33/48頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MODEM AFE MULTIREGIONAL 32QFN |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 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 |
| 供應商設備封裝： | 32-QFN（5x5） |
| 包裝： | 帶卷 (TR) |
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DS_1903C_033
73M1903C Data Sheet
Rev. 5.0
39
Appendix A
73M1903C DAA Resistor Calculation Guide
TXAP1
RXAP
R1
R3
R1
R2
R3
R2
CBlock
RW
C1
TXAN1
ACTIVE
INDUCTOR
RING
DETECTOR
C1
Bead
Hook
Switch
Bridge
Diode
TIP
RING
RXAN
Figure 17: Typical DAA Block Diagram
The following procedure can be used to approximate the component values for the DAA with a 600 Ohm
termination. With other terminations the values will be different. The optimal values will be somewhat
different due to the effects of the reactive components in the DAA (this is a resistive 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 determine R1. For a differential
transmitter R1 is composed of 2 resistors that represent the difference in resistance between the total
winding resistance of the transformer and the reflected impedance, 600
. This value is usually supplied
by the transformer vendor. The DAA should be designed to reflect 600
when looking in at TIP/RING.
The transformer is normally a 1 to 1 turns ratio, the holding coil and ring detect circuit are high
impedance, and 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,
therefore:
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 are 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 is 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 modem side of the transformer.
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相關代理商/技術參數(shù) |
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|---|---|
| 73M1903-EVM-600 | 功能描述:網(wǎng)絡開發(fā)工具 73M1903 w/Ppu & 600 Ohm Term-Usa & Japan RoHS:否 制造商:Rabbit Semiconductor 產(chǎn)品:Development Kits 類型:Ethernet to Wi-Fi Bridges 工具用于評估:RCM6600W 數(shù)據(jù)速率:20 Mbps, 40 Mbps 接口類型:802.11 b/g, Ethernet 工作電源電壓:3.3 V |
| 73M1903-EVM-ETSI | 功能描述:網(wǎng)絡開發(fā)工具 73M1903 w/Etsi 203 Complex Imped. Term RoHS:否 制造商:Rabbit Semiconductor 產(chǎn)品:Development Kits 類型:Ethernet to Wi-Fi Bridges 工具用于評估:RCM6600W 數(shù)據(jù)速率:20 Mbps, 40 Mbps 接口類型:802.11 b/g, Ethernet 工作電源電壓:3.3 V |
| 73M1903-EVM-WW | 功能描述:BOARD DEMO 73M1903 PPU WORLDWIDE RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:- 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- 主要目的:電源管理，電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板 |
| 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 安裝風格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
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