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參數(shù)資料
| 型號： | SAA7706H/N210,557 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 7/52頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CAR RADIO DSP 80-QFP |
| 標準包裝： | 330 |
| 類型： | 汽車信號處理器 |
| 接口： | I²C，I²:S，LSB，SPDIF |
| 電壓 - 輸入/輸出： | 3.30V |
| 電壓 - 核心： | 3.30V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 80-BQFP |
| 供應商設備封裝： | 80-QFP（14x20） |
| 包裝： | 托盤 |
| 其它名稱： | 935270285557 SAA7706H/N210 SAA7706H/N210-ND |
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2001 Mar 05
15
Philips Semiconductors
Product specication
Car radio Digital Signal Processor (DSP)
SAA7706H
8.1.4
PINS VDACN1, VDACN2 AND VDACP
These pins are used as negative and positive reference for
the ADC1, 2, 3 and the level-ADC. They have to be directly
connected to the VSSA1 and filtered VDDA1 for optimal
performance (see Figs 25 and 26).
8.1.5
PIN VREFAD
Via this pin the midref voltage of the ADCs is filtered. This
midref voltage is used as half supply voltage reference of
the ADCs. External capacitors (connected to VSSA1)
prevent crosstalk between switch cap DACs of the ADCs
and buffers and improves the power supply rejection ratio
of all components. This pin is also used in the application
as reference for the inputs TAPE and CD (see Fig.4). The
voltage on pin VREFAD is determent by the voltage on
pins VDACP and VDACN1 or VDACN2 and is found as:
8.1.6
SUPPLY OF THE ANALOG INPUTS
The analog input circuit has separate power supply
connections to allow maximum filtering. These pins are
VSSA1 for the analog ground and VDDA1 for the analog
power supply.
8.2
The signal audio path for input signals CD,
TAPE, AUX, PHONE, NAV and AM
The left and right channels are converted and
down-sampled by the ADF1_a, ADF1_b. This data stream
is converted into a serial format and fed to the DSP1 and
DSP2 source selectors. In Figs 7 and 8 the overall and
detailed frequency response curves of the
analog-to-digital audio decimation path based on a
44.1 kHz sample frequency are shown.
V
VREFAD
V
VDACP
V
VDACN1,2
–
2
----------------------------------------------------
=
handbook, full pagewidth
0
250
0
100
MGT463
300
500
400
200
150
100
50
f (kHz)
α
(dB)
Fig.7
Overall frequency response curve analog-to-digital audio path decimation based on a 44.1 kHz sample
frequency.
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