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CS5525
(Rev.:1998)

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

Cirrus Logic 

CS5525 CS5526

Description

Description

The 16-bit CS5525 and the 20-bit CS5526 are highly integrated ∆Σ A/D con-

verters which include an instrumentation amplifier, a PGA (programmable

gain amplifier), eight digital filters, and self and system calibration circuitry.

The converters are designed to provide their own negative supply which allows

their on-chip instrumentation amplifiers to measure bipolar ground-referenced

signals ≤±100 mV. By directly supplying NBV with -2.5 V and with VA+ at

5 V, ±2.5 V signals (with respect to ground) can be measured.

The digital filters provide programmable output update rates between 3.76 Hz

to 202 Hz (XIN = 32.768 kHz). Output word rates can be increased by approx-

imately 3X by using XIN = 100 kHz. Each filter is designed to settle to full

accuracy for its output update rate in one conversion cycle. The filters with

word rates of 15 Hz or less (XIN = 32.768 kHz) reject both 50 and 60 Hz (±3

Hz) line interference simultaneously.

Low power, single conversion settling time, programmable output rates, and

the ability to handle negative input signals make these single supply products

ideal solutions for isolated and non-isolated applications.

VA+ AGND

VREF+ VREF-

DGND VD+

AIN+

+

Programmable

X20

AIN-

-

Gain

NBV

A0

A1 Latch

A2

A3

Calibration

Memory

Differential

4th Order

Delta-Sigma

Modulator

Digital Filter

Calibration µC

Clock

Gen.

Calibration

Register

Control

Register

Output

Register

CS

SCLK

SDI

SDO

CPD

XIN XOUT

2

PI202PP3 JAN ‘98

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