DSP56166ROM datasheet(17/63 Pages) MOTOROLA

17 / 63 page

PRELIMINARY - 6/15/93

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

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

600

Ω

0.001

µF

600

Ω

Vrad

0.001

µF

Vrad

VssA

VddA

(≤ ±1mA)

µF

0.1

µF

VssA

µF

0.1

µF

VssA

< 0.1

µF

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