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DSP56166ROM датащи(PDF) 17 Page - Motorola, Inc

номер детали DSP56166ROM
подробное описание детали  16-bit General Purpose Digital Signal Processor
PDF  63 Pages
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производитель  MOTOROLA [Motorola, Inc]
домашняя страница  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

DSP56166ROM датащи(HTML) 17 Page - Motorola, Inc

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PRELIMINARY - 6/15/93
7
DSP56166 Technical Data Sheet
MOTOROLA
Analog I/O Figure 1. describes the recommended analog I/O and power supply configurations.
The two analog inputs are electrically identical. When one is not used, it can be left floating. When used, an
AC coupling capacitor is required. The value of the capacitor along with the input impedance of the pin de-
termine the cut off frequency of a high pass filter. The input impedance of the MIC and AUX varies as a
function of the
∑∆ modulator master clock. 78 kΩ is a typical value at 2MHz. An AC capacitor of 1µF defines
a high pass filter pole of 2 Hz. A smaller capacitor value will move this pole higher in frequency.
Analog I/O Figure 1. Recommended Analog I/O Configuration
Vrad
Σ∆
modulator
2.0V
±10%
Mic
Vrda
Aux
-6dB
6dB
MGS1-0 bits
2 POLE
LPF
VC3-VC0
MAX
Spkp
2Vp
(2/5 Vdd)
Spkm
(MAX 1Vp
when single ended
on 0.5K
Ω)
INS bit
17dB
Vdiv
≥1KΩ
≤50nF
54K
Ω
36K
Ω
digital Vdd
VddA
VssA
+
15
µF
0.1
µF
VssA
+5V
+
220
µF
Analog Decoupling
near DSP
Single trace
Ext. GND Ext. Supply
GND
digital Vss
Single trace
0.01
µF
1
µF
600
Ω
0.001
µF
1
µF
600
Ω
Vrad
0.001
µF
Vrad
VssA
VddA
(≤ ±1mA)
+
15
µF
0.1
µF
VssA
+
15
µF
0.1
µF
VssA
< 0.1
µF
RC



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