DSP56166 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

DSP56166

16-bit General Purpose Digital Signal Processor

Motorola => Freescale 

PRELIMINARY - 6/15/93

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.

Vrad

1µF 600Ω

Vrad

0.001µF

600Ω

1µF

0.001µF

+

15µF

0.1µF

VssA (≤ ±1mA)

+

15µF

0.1µF

VddA

Mic

VssA

Aux

Vrad

Vrda

INS bit

2.0V ±10%

(2/5 Vdd)

-6dB

6dB

17dB

VssA

< 0.1µF

≤50nF

Vdiv

Spkp

54KΩ

36KΩ

(MAX 1Vp

when single ended

on 0.5KΩ)

digital Vdd

MAX

2Vp

≥1KΩ

digital Vss

0.01µF

220µF

+

Single trace

Spkm

VddA

+

15µF

GND

+5V

Ext. GND Ext. Supply

Single trace

VssA

RC

VssA

VC3-VC0

0.1µF

Analog Decoupling

near DSP

MGS1-0 bits

Σ∆

modulator

2 POLE

LPF

Analog I/O Figure 1. Recommended Analog I/O Configuration

7

DSP56166 Technical Data Sheet

MOTOROLA

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