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參數(shù)資料
| 型號(hào)： | 935269576557 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | 14 X 14 MM, 1 MM HEIGHT, HEAT SINK, PLASTIC, SOT-638-1, TQFP-100 |
| 文件頁數(shù)： | 72/84頁 |
| 文件大?。?/td> | 1054K |
| 代理商： | 935269576557 |
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Koninklijke Philips Electronics N.V. Copyright 2001. All rights reserved.
9397 750 08865
74 of 84
Rev. 02 — 8 October 2001
Product data
PNX8510/11
Philips Semiconductors
Analog Companion Chip
12.3 Application Information
From the simplified schematic of the DAC in Figure 25 it can be seen that the output voltage
swing depends upon:
the maximum digital input level at low frequencies (
α)
the reference voltage vref (nominal VDDA/2)
the current mirror gain (ideally 12)
the ratio of the I/V conversion resistance (Rconv) and the reference resistance (Rref)
This relationship is:
Vout(rms) = 12
α/√2 Rconv/Rref Vref
The reference resistor is dimensioned to be 18k
. Since the reference voltage Vref is nominally
half the supply voltage, the I/V conversion resistor must be dimensioned by:
Rconv = Vout(rms)/Vref
√2/(12 α) Rref
For an rms output voltage of 1000mVrms, a reference voltage of 1.65V, a reference resistance of
18 k
and a maximum digital input level of 0.521 (-5.67dB), the I/V conversion resistor should
be 2470
.
Figure 25: Simplified Schematic of Audio DAC
1: 7
:
12
vdda
p-dac
lout
Rconv
vout
vref
n-dac
vss
vssa
Rref
7 :
12
vref
vout(rms) =
12
α Rconv
1.41 Rreg
vref
α: max. dig. i/p level
v6.0: Rconv = 247
Rref = 18000
α: -5.67dB = 0.521
=> vout(rms) = 0.607 * vref
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