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SAF7741 数据表(PDF) 32 Page - NXP Semiconductors

部件名 SAF7741
功能描述  Dual IF car radio and audio DSP
PDF  83 Pages
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制造商  NXP [NXP Semiconductors]
网页  http://www.nxp.com
标志 NXP - NXP Semiconductors

SAF7741 数据表(HTML) 32 Page - NXP Semiconductors

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SAF7741_5
© NXP B.V. 2008. All rights reserved.
Objective data sheet
Rev. 05 — 09 May 2008
32 of 83
NXP Semiconductors
SAF7741HV
Dual IF car radio and audio DSP (N1F)
In this example input voltage reduction is accomplished by the external 8.2 k
Ω to 10 kΩ
resistor divider. The rather low-value resistor divider is necessary because in this case the
parasitic capacitance on pins AIN0_L and AIN0_R will reduce the common-mode signal
on them. The CMRR can be guaranteed when the source and cable impedance do not
exceed the specified value as stated in the conditions column of Table 35.This leads to a
reduction of the CMRR when the source impedance is too high. Half of the supply voltage
is provided as reference by connecting the negative inputs of the second operational
amplifier to VREFAD by means of the gnd_sel switches and the external 1.0 M
Ω resistor.
The 1.0 nF capacitors are used for anti-aliasing.
An example of a high common-mode input with only one ground-shielding line is shown in
Figure 22.
Fig 21. High common-mode stereo input with two ground lines
Fig 22. High common-mode stereo input with one ground line
CD PLAYER
LEFT
POSITIVE
CD PLAYER
RIGHT
POSITIVE
CD PLAYER
LEFT
NEGATIVE
1M
22uF
220nF
8.2 k
Ω
AIN0R
AIN0R
_REF
VREFAD
ADX
ADY
anselX
gndselX
anselY
gndselY
dif_swY
dif_swX
Ri
Ri
Ri
Ri
Ri
Ri
10 k
Ω
1nF
1nF
220nF
8.2 k
Ω
AIN0L
AIN0L
_REF
10 k
Ω
1M
CD PLAYER
RIGHT
NEGATIVE
47
μF
47
μF
CD PLAYER
LEFT
POSITIVE
CD PLAYER
RIGHT
POSITIVE
CD PLAYER
CABLE
GROUND
220nF
47uF
220nF
8.2 k
Ω
8.2 k
Ω
1M
Ω
22uF
AIN0L
AIN0L
_REF
AIN0R
AIN0R
_REF
VREFAD
ADX
ADY
anselX
gndselX
anselY
gndselY
dif_swY
dif_swX
Ri
Ri
Ri
Ri
Ri
Ri
10 k
Ω
10 k
Ω
1nF
1nF



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