參數(shù)資料
型號: PNX8510
廠商: NXP Semiconductors N.V.
英文描述: Analog companion chip
中文描述: 模擬伴隨芯片
文件頁數(shù): 80/92頁
文件大?。?/td> 3064K
代理商: PNX8510
Philips Semiconductors
PNX8510/11
Analog companion chip
Product data
Rev. 04 – 12 January 2004
80 of 92
9397 750 12612
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
10. Application information
10.1 Audio DAC
From the simplified schematic
Figure 32
, it can be seen that the output voltage swing
depends upon:
the maximum digital input level at low frequencies
(
α
)
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
0xB5
0xB
0xB3
0x70
0x10
0x70
Table 44:
Offset
0x01
0x02
PNX8510/11_AUDIO
Value
0x0
0x0
Table 43:
Offset
PNX8510/11_VIDEO
…continued
Value
α
: max. dig. i/p level
v6.0: Rconv = 247
Rref = 18000
α
: -5.67 dB = 0.521
=> vout(rms) = 0.607 vref
Fig 32. Simplified schematic of audio DAC
VDDA
VSSA
VSS
Vref
Vref
Rref
VOUT
LOUT
Rconv
VSS
VDDA
7
:
12
7
1
:
:
12
VDDA
p-dac
n-dac
MDB660
vout rms
)
---------------------------
vref
=
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