參數(shù)資料
型號(hào)： SAA7706H/N210,557
廠商： NXP Semiconductors
文件頁(yè)數(shù)： 9/52頁(yè)
文件大?。?/td> 0K
描述： IC CAR RADIO DSP 80-QFP
標(biāo)準(zhǔn)包裝： 330
類型： 汽車信號(hào)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(yīng)商設(shè)備封裝： 80-QFP（14x20）
包裝： 托盤
其它名稱： 935270285557
SAA7706H/N210
SAA7706H/N210-ND
2001 Mar 05
17
Philips Semiconductors
Product specication
Car radio Digital Signal Processor (DSP)
SAA7706H
8.3
Signal path for level information
For FM weak signal processing, for AM and FM purposes
(absolute level and multipath) a level input is implemented
(pin LEVEL). In the event of radio reception the clocking of
the filters and the level-ADC is based on a 38 kHz
sampling frequency. A DC input signal is converted by a
bitstream sigma-delta ADC followed by a decimation filter.
The input signal has to be obtained from a radio part. The
tuner must deliver the level information of either AM or FM
to pin LEVEL.
The input signal for level must be in the range 0 to 3.3 V
(VVDACP VVDACN). The 9-bit level-ADC converts this
input voltage in steps with a resolution better than at least
14 mV over the 3.3 V range.
The tolerance on the gain is less than 2%. The MSB is
always logic 0 to represent a positive level. Input level
span can be increased by an external resistor tap. The
high input impedance of the level-ADC makes this
possible.
The decimation filter reduces in the event of an 38 kHz
based clocking regime the bandwidth of the incoming
signal to a frequency range of 0 to 29 kHz with a resulting
fs = 76 kHz. The response curve is given in Fig.9.
The level information is sub-sampled by the DSP1 to
obtain a field strength and a multipath indication. These
values are stored in the coefficient or data RAM. Via the
I2C-bus they can be read and used in other microcontroller
programs.
handbook, full pagewidth
10
010
40
30
80
70
60
50
20
40
50
60
10
0
30
20
f (kHz)
α
(dB)
MGT465
Fig.9 Frequency response level-ADC and decimal filter.
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