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| 型號： | 73M1903-IVT/F |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 封裝： | ROHS COMPLIANT, MO-153AC, TSSOP-20 |
| 文件頁數(shù)： | 16/47頁 |
| 文件大?。?/td> | 541K |
| 代理商： | 73M1903-IVT/F |
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DS_1903_032
73M1903 Data Sheet
Rev. 2.1
23
5.2
Transmit Power - dBm
To calculate the analog output power, the peak voltage is calculated and the peak to rms ratio (crest
factor) must be known. The following formula is used to calculate the output power, in dBm referenced to
600
Ω.
Pout (dBm) = 10 * log [ ( Vout (V) / cf )
2 / ( 0.001 * 600 ) ]
The following example demonstrates the calculation of the analog output power given a 1.2 kHz FSK tone
(sine wave) with a peak code word value of 11,878 sent out by the DSP.
The differential output voltage at TXAP-TXAN will be:
With FreqFctr = 1.02, (See Figure 10)
Vout (V) = 2 * (11,878/32,767) * 0.6640625 * 0.8889 * 1.36 * 1.0 * 1.4454 * 1.02 = 0.841 Vpk.
The output signal power will be:
Pout (dBm) = 10 * log [(0.841 / 1.41)
2 / (0.001 * 600) ] = - 2.29 dBm.
Table 13: Peak to RMS Ratios for Various Modulation Types
Transm it Type
Crest Factor
Max Line Level
V.90
4.0
-12 dBm
QAM
2.31
-9 dBm
DPSK
1.81
-9 dBm
FSK
1.41
-9 dBm
DTMF
1.99
-5.7 dBm
5.3
Control Register (CTRL1): Address 00h
Reset State 08h
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ENFE
Unused
TXBST1
TXBST0
TXDIS
RXG1
RXG0
RXGAIN
ENFE
1 = Enable the digital filters and analog front end.
0 = Disable the analog blocks shut off the clocks to the digital and analog receive/transmit
circuits.
TXBST1
1 = Add a gain of 1.335 dB (16.6%) to the transmitter; also the common mode voltage of the
transmit path is increased to 1.375 V. This is intended for enhancing DTMF transmit
power only and should not be used in data mode.
0 = No gain is added
TXBST0
1 = A gain of 1.65 dB (21%) is added to the transmitter
0 = The gain of the transmitter is nominal
TXDIS
1 = Tri-state the TXAP and TXAN pins, provides a bias of VBG into 80 k
for each output pin
RXG1:0
These bits control the receive gain as shown in Table 12.
RXGAIN
1 = Increase the gain of the receiver by 20 dB.
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| 73M1906B-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 |
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