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參數(shù)資料
| 型號： | SAA7706H/N210S,557 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 5/52頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DSP CAR RADIO 80QFP |
| 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(yīng)商設(shè)備封裝： | 80-QFP（14x20） |
| 包裝： | 托盤 |
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2001 Mar 05
13
Philips Semiconductors
Product specication
Car radio Digital Signal Processor (DSP)
SAA7706H
8.1.1
THE REALIZATION OF COMMON MODE INPUT WITH
AIC
A high common mode rejection ratio can be created by the
use of the ground return pin. Pin CD_(L)_GND can be
used in the case that the left and right channel have one
ground return line. CD_(L)_GND and CD_R_GND can be
used for separated left and right ground return lines. The
ground return lines can be connected via the switch
GNDC1/2 and GNDRC1/2 (see Fig.4) to the plus input of
the second operational amplifier in the signal path. The
signal of which a high common mode rejection ratio is
required has a signal and a common signal as input. The
common signal is connected to the CD_(L)_GND and/or
CD_R_GND input. The actual input can be selected with
audio input control AIC1/2(1:0).
In Fig.4 the CD input is selected. In this situation both
signal lines going to S1/2 in front of the ADC will contain
the common mode signal. The ADC itself will suppress this
common mode signal with a high rejection ratio. The inputs
CD_L and CD_R in this example are connected via an
external resistor tap of 82 k
and 100 k to be able to
handle larger input signals. The 100 k
resistors are
needed to provide a DC biasing of the operational
amplifiers OA1 and OA2. The 1 M
resistor provides
DC biasing of OA3 and OA4. If no external resistor tap is
needed the resistors of 100 k
and 1 M still have to
provide DC biasing. Only the 82 k
resistor can be
removed. The impedance level in combination with
parasitic capacitance at input CD_L or CD_R determines
for a great deal the achievable common rejection ratio.
handbook, full pagewidth
MGT460
72
CD_L
77
CD_(L)_GND
OA2
OA4
78
VREFAD
14
to MUX S1/2
AIC1/2(1:0)
GNDC1/2
GNDRC1/2
00
01
10
G1
G0
11
CD_R_GND
70
CD_R
on-chip
off-chip
RIGHT
LEFT
GROUND
RIGHT
from
CD-player
analog
GROUND
LEFT
10 k
82 k
82 k
1 M
1 M
100 k
100 k
10 k
10 k
MIDREF
OA1
OA3
to MUX S1/2
10 k
10 k
10 k
00
01
10
11
MUX
Fig.4 Example of the use of common mode analog input in combination with input resistor tap.
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