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CS5525-AP

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

Cirrus Logic 

CS5525 CS5526

Figure 4 illustrates the CS5525/26 connected to

measure ground referenced unipolar signals of a

positive polarity using the 1 V, 2.5 V, and 5 V input

voltage ranges on the converter. For the 25 mV, 55

mV, and 100 mV ranges the signal must have a

common mode near +2.5 V (NBV = 0V).

The CS5525/26 are optimized for the measurement

of thermocouple outputs, but they are also well

suited for the measurement of ratiometric bridge

transducer outputs. Figure 5 illustrates the

CS5525/26 connected to measure the output of a

ratiometric differential bridge transducer while op-

erating from a single +5 V supply.

2N 5087

or sim ilar

NBV

10µF

+

34.8K

30.1K

2.0K

NBV

2.1K

+

10 µF

Figure 2. Charge Pump Drive Circuit for VD+ = 3 V.

-5V

-5V

Figure 3. Alternate NBV Circuits.

+5V

A nalo g

S upply

10 Ω

0 .1 µF

0 .1 µF

2.5V

2

VA+

20

VREF+

13

VD+

10

XOUT

500k Ω

20 pF

19 VREF-

0 to +5V Input

+

-

CM = 0 to VA+

C S5525 XIN 9

3

CS5526

AIN +

4

A IN -

1 AGND

16 A3

15 A2

7 A1

6 A0

CS 18

SCLK 11

SDI 17

14

SDO

NBV CPD DGND

32.768 ~ 100kH z

O ptional

C loc k

S o u rc e

S e rial

D ata

Interface

5

8

12

Figure 4. CS5525/26 Configured for ground-referenced Unipolar Signals.

DS202F3

9

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