CS5525(1998) Просмотр технического описания (PDF) - Cirrus Logic

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CS5525
(Rev.:1998)

16-Bit/20-Bit ∆Σ Multi-Range ADC with 4-Bit Latch

Cirrus Logic 

CS5525 CS5526

Overview

Overview

The CS5525 and CS5526 are 16 and 20-bit A/D converters respectively,

employing the Delta-Sigma topology. They are highly integrated with an on-

chip chopper stabilized instrumentation amplifier, programmable gain ampli-

fier, charge pump drive circuitry and negative bias voltage input all operating

from a single +5 V supply. A simple programming structure and 3-wire SPI™

and Microwire™ compatible interface enables selectable output word rates,

system/self-calibration with read/write registers and the ability to control

external portions of the application circuit via the on-chip 4-bit output latch.

FAQs

1) Do you have a four channel part?

A: Not at this time, but we have plans to do a multi-channel product Q4 ‘97.

We also have 4 digital output lines which can be used to control either

switches or a multiplexer through the ADC’s serial port, thus eliminating

the use of an extra port on the system mC and additional opto-isolators in

isolated applications.

2) How does the 4-bit digital latch on a DS ADC allow me to change chan-

nels?

A: The CS5525 and CS5526 as well as the CS5504 family of ADC’s are

designed to settle in one conversion cycle. This means a mux can be

switched from channel-to-channel with every conversion while maintain-

ing resolution and accuracy.

3) What determines the input span of the converter?

A: Performing a full scale gain calibration, or modifying the reference volt-

age. For example, if the reference voltage is reduced by 50% the default

input ranges scale by one half. Example: Vref = 2.5 V, Vin = 25 mV to

5 V and Vref = 1.25 V, Vin = 12.5 mV to 2.5 V.

4) How does the output word rate affect the ADC’s bandwidth?

PI202PP3 JAN ‘98

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