CS5181 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS5181

∆Σ Modulator & 400 kHz to 625 kHz 16-Bit ADC

Cirrus Logic 

CS5181

+15 V

2 kΩ

+15 V

10 kΩ

2 kΩ

0.1 µF

-

U1

+

2 kΩ

0.1 µF

-

U3

+

-15 V

0.1 µF

2 kΩ

+15 V

-15 0.1 µF

2 kΩ

+15 V

301 Ω

2200 pF

100 Ω

2200 pF

0.1 µF

-

U2

+

2 kΩ

-15 V

0.1 µF

0.1 µF

-

U4

+

301 Ω

-15 V

0.1 µF

10 kΩ

10 kΩ

10 µF +

AIN-

CS5181

AIN+

VREFOUT

Figure 15. Four amplifier balanced driver.

Figure 15 illustrates a four amplifier circuit which

gives the best performance by keeping everything

balanced. Performance is generally limited by the

amplifiers. Again, the output resistors are used to

scale down the input signal. Figures 16 and 17 il-

lustrate the performance of the CS5181 with this

amplifier circuit.

Test Signal: 20 kHz @ 0 dB

S/N = 93.2 dB

S/D = 88.6 dB

S/N+D = 87.2 dB

8192 Samples

Figure 18 illustrates a Differential Non-linearity

plot of the converter. Data for the plot was taken

using a repeating ramp. Figure 19 is a histogram of

the DNL data in Figure 18.

Figure 20 illustrates a noise histogram of the con-

verter with its inputs shorted and connected to a

proper common mode voltage.

Figure 16. Performance of amplifier in Figure 15

DS250PP1

21

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