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參數資料
| 型號： | SAA7706H/N107S,518 |
| 廠商： | NXP Semiconductors |
| 文件頁數： | 6/52頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DSP CAR RADIO 80QFP |
| 標準包裝： | 500 |
| 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： | 帶卷 (TR) |
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2001 Mar 05
14
Philips Semiconductors
Product specication
Car radio Digital Signal Processor (DSP)
SAA7706H
handbook, full pagewidth
MGT461
ADC
0 dB (full-scale)
660 mV (RMS)
GAIN
Audio
AUDIO
DIGITAL
FILTER
5 dB GAIN
DSP2
STEREO
DECODER
3 dB GAIN
DSP1
2 dB (full-scale)
Fig.5 Audio gain through ADC and digital filter path to DSP.
8.1.2
REALIZATION OF THE AUXILIARY INPUT WITH VOLUME
CONTROL
A differential input with volume control for mixing to the
front left or front right of both DAC outputs is provided. The
inputs consist of a PHONE and NAV input. Both are
accompanied with their ground return lines. After selection
of PHONE or NAV the volume can be changed from about
+18 to
22.5 dB in 27 steps and mute (MIX output). This
signal can be added to the left and/or right front DAC
channels.
The output signals of both input circuits can also be
switched to ADC1 and/or ADC2, depending on the settings
of audio input control 1 (AIC1) and audio input control 2
(AIC2), without volume control (see Fig.3).
8.1.3
REALIZATION OF THE FM INPUT CONTROL
The gain of the circuit has a maximum of 2.26 (7.08 dB).
This results in an input level of 368 mV for full-scale, which
means 0 dB (full-scale) at the DSP1 input via the stereo
decoder (see Fig.6). The gain can be reduced in steps of
1.5 dB. When the gain is set to
3.4 dB the input level
becomes 1229 mV for full-scale. This setting accounts for
the 200 mV (RMS) input sensitivity at 22.5 kHz sweep and
a saturation of the input at 138 kHz sweep.
RDS update: for RDS update the fast access pin SEL_FR
must be made HIGH. In that case the FM_RDS signal also
goes through the path that was set for FM_MPX. In this
situation the signal must be obtained via the FM_RDS
input and a noise sample can be retrieved. The input
FM_MPX gets high-ohmic. Charging of the coupling
capacitor connected to pin FM_MPX is no longer possible.
handbook, full pagewidth
MGT462
ADC
0 dB (full-scale)
831 mV (RMS)
GAIN
FM
AUDIO
DIGITAL
FILTER
5 dB GAIN
DSP2
STEREO
DECODER
3 dB GAIN
DSP1
Fig.6 FM gain path through stereo decoder to DSP1.
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