- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄382396 > PNX2000 (NXP Semiconductors N.V.) Audio video input processor PDF資料下載
參數(shù)資料
| 型號： | PNX2000 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Audio video input processor |
| 中文描述： | 音頻視頻輸入處理器 |
| 文件頁數(shù)： | 22/31頁 |
| 文件大小： | 244K |
| 代理商： | PNX2000 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁當前第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁
9397 750 13928
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data
Rev. 03 – 23 August 2004
22 of 31
Philips Semiconductors
PNX2000
Audio video input processor
10.3 Audio DAC characteristics
[1]
Allowed audio sample frequencies are 32 kHz, 44.1 kHz and 48 kHz. Default f
S
in I
2
S-bus master mode is 48 kHz.
The audio DACs are based on a switched-resistor architecture which acts as a controlled
voltage divider between the positive and negative references ADACn_P and ADACn_N.
Therefore all noise on the reference pins will spread directly to the associated output pin
ADACn. Consequently it is important to provide adequate filtering of the reference voltage
to allow optimum signal-to-noise performance. Also, the voltage difference between
ADACn_P and SDAC_3V3 should be kept to a minimum as any difference will degrade
distortion performance.
The DACs have an internal resolution of 4 bits, running at a clock frequency of 128 f
S
,
using a noise shaper circuit to shift the quantization noise to out-of-band frequencies. To
prevent HF overloading of the circuit that is driven by the DAC outputs, a 3.3 nF capacitor
should be used to filter off the HF signal content. Together with the DAC’s nominal output
impedance of 1 k
, a first order roll-off at approximately 50 kHz will result. One capacitor
is required for each DAC output, connected between ADACn and the corresponding
ADACn_N.
10.4 Timing
10.4.1
Clock
Crystal specification
The crystal oscillator can be used with an external crystal, or in bypass mode with external
clock signal, see
Figure 4
.
Table 24:
Tamb = 0
°
C to +70
°
C for commercial unless otherwise specified.
Symbol
Parameter
Dynamic characteristics: Audio DAC
Conditions
Min
Typ
Max
Unit
Audio DAC Outputs: ADAC1-12
f
s
audio sample frequency
-
32
48
[1]
48
kHz
S/N
Signal to Noise Ratio, CCIR-2 k
weighted
Total Harmonic Distortion + Noise to
Signal ratio
frequency response
outputs muted; reference f = 2 kHz,
0 dBFS
f =1 kHz; 0 dBFS; 22 kHz
measurement bandwidth
+/-1 dB
-
94
-
dB
(THD+N)/S
-
77
-
dB
f
res
<10
-
22.5
kHz
α
ct
crosstalk between adjacent DACs
f = 1 kHz; 0 dBFS
-
90
-
dB
相關PDF資料 |
PDF描述 |
|---|---|
| PNX2000HL | Audio video input processor |
| PNX3000 | Analog front end for digital video processors |
| PNX3000HL | Analog front end for digital video processors |
| PNX3000N3 | Analog front end for digital video processors |
| PNX8510 | Analog companion chip |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PNX2000HL | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Audio video input processor |
| PNX3000 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Analog front end for digital video processors |
| PNX3000HL | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Analog front end for digital video processors |
| PNX3000HL/N3 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Analog front end for digital video processors |
| PNX3000N3 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Analog front end for digital video processors |
發(fā)布緊急采購，3分鐘左右您將得到回復。