參數(shù)資料
型號: 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
文件頁數(shù): 18/48頁
文件大?。?/td> 487K
代理商: 73M1903C-IM/F
DS_1903C_033
73M1903C Data Sheet
Rev. 5.0
25
With the transmit code word of +/- 32,767, the nominal differential swing at the transmit pins at dc is:
Vout (V) = 2 * code/32,767 * DSDMgain * dacGAIN * VREF * TLPFgain * SMFLTgain * FreqFctr
= 2 * 32,767/32767 * 0.6640625 * 0.8889 * 1.36 * 1.0 * 1.4454 * 1.0 = 2.31Vpk diff.
When DTMFBST bit is set, Vout (V) = 1.166 * 2.31= 2.693Vpk diff.
When TXBST0 bit is set, Vout (V) = 1.21 * 2.31= 2.795Vpk diff.
(1)
When both DTMFBST and TXBST0 are set to 1, Vout (V) = 2.795 * 1.166 = 3.259Vpk diff.
[1] If not limited by power supply or internal reference.
6.5
Transmit Power – dBm
To calculate the analog output power, the peak voltage must be calculated and the peak to rms ratio
(crest factor) must be known. The following formula can be 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 8)
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 10: Peak to RMS Ratios and Maximum Transmit
Levels for Various Modulation Types
Transmit 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
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