參數(shù)資料
型號(hào)： 73M1903C-IM/F
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQCC32
封裝： LEAD FREE, QFN-32
文件頁(yè)數(shù)： 33/48頁(yè)
文件大?。?/td> 487K
代理商： 73M1903C-IM/F
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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