AMC1203 datasheet(13/23 Pages) TI

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GENERAL DESCRIPTION

Filter

Module2

ControlModule

Signal

Generator

Interrupt

Unit

Map

Interface

Module

ADS1205

AMC1210

INT

Resolver

ACK

IN1

CLK1

PWM1

PWM2

CLK

IN2

CLK2

IN4

CLK4

AD0

AD7

ALE

RST

AMC1203

Current

Shunt

Resistor

Input

Control

SincFilter/

Integrator

Time

Measurement

Comparator

Filter

FilterModule1

IN3

CLK3

Current

Shunt

Resistor

AMC1203

Filter

Module3

Filter

Module4

AMC1203

SBAS427 – FEBRUARY 2008

The AMC1203 is a single-channel, 2nd-order, CMOS,

suitable application-specific device, such as the

delta-sigma modulator, designed for medium- to

AMC1210, a four-channel digital sinc-filter. Figure 23

high-resolution A/D conversions from dc to 39kHz

shows

two

AMC1203s

and

one

ADS1205

with an oversampling ratio (OSR) of 256. The isolated

(dual-channel, non-isolated modulator) connected to

output of the converter (MDAT) provides a stream of

an AMC1210, building the entire analog front-end of a

digital ones and zeros. The time average of this serial

resolver-based motor-control application. For detailed

output is proportional to the analog input voltage.

information on the ADS1205 and AMC1210, please

visit our home page at www.ti.com.

The modulator shifts the quantization noise to high

frequencies; therefore, a low-pass digital filter should

The

overall

performance

(speed

and

accuracy)

be used at the output of the device to increase the

depends on the selection of an appropriate OSR and

overall performance. This filter is also used to convert

filter type. A higher OSR results in higher accuracy

from the 1-bit data stream at a high sampling rate into

while operating at lower refresh rate. Alternatively, a

a higher-bit data word at a lower rate (decimation). A

lower OSR results in lower accuracy, but provides

digital signal processor (DSP), microcontroller (

µC) or

data at a higher refresh rate. This system allows

field programmable gate array (FPGA) can be used

flexibility with the digital filter design and is capable of

to implement the filter. Another option is using a

A/D conversion results that have a dynamic range

exceeding 95dB with OSR = 256.

Figure 23. Example of a Resolver-Based Motor-Control Application

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