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CS5542-KL

22-Bit, Multi-Channel ∆Σ ADC Chip Set

Cirrus Logic 

CS5542 CS5543

DATSEL[3:0]

0000

0000

0000

0000

0000

0000

0000

0000

DTEST[2:0]

000

001

010

011

100

101

110

111

FUNCTION

Normal Operation

Input Offset Voltage Cal

Noise Cal

System Offset Cal

Full-Scale Gain Cal (Uses ICAL input)

Full-Scale Gain Cal (Uses INL(INR) input)

Decimator and Modulator Power-Down

Modular Power Down

Table 1. Operation Modes

DTEST[2:0]

DATSEL[3:0]

FUNCTION

000

000

000

000

000

000

000

000

000

000

000

000

000

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

11XX

Normal Operation

Tri-State Dataout [3:0] Pins

Test Pattern #1

Test Pattern #2

Offset Cal Register Load

Offset Cal Register Load

Gain Cal Register Load

Noise Cal Register Load

Offset Cal Register Read

Offset Cal Register Read

Gain Cal Register Read

Noise Cal Register Read

Reserved

Notes: 1. MSW = Most Significant Word

2. LSW = Least Significant Word

Table 2. Control Modes

DATA TYPE

(SIGN, MSB first)

(- - -)

(MSW) (Note 1)

(LSW) (Note 2)

(MSW)

(LSW)

pins.

Offset Voltage Cal mode.

When entering calibration commands via the

DTEST lines, the calibration steps must follow a

specific sequence for the CS5542/CS5543 pair to

be properly calibrated. Figure 4 illustrates the cal-

ibration sequence for the CS5542/CS5543 chip set.

After the RST is issued, the chip set will be in the

normal mode. The first calibration step is the Input

The CS5542 is designed to digitize an input cur-

rent. This current is normally sourced from a pho-

todiode at the input of the chip. The Input Offset

Voltage Cal step is intended to remove any offset at

the front end of the modulator. This should be cal-

ibrated with no photodiode current present. If the

phototdiode is replaced with a resistor, the voltage

System

Reset

Normal

Input Offset

Voltage

Cal

Noise

Cal

System

Offset

Cal

INR(INL)

or ICAL

Gain Cal

Note: Main Current Input must be idle for all calibration modes except for Gain Cal using INL(INR).

Figure 4. Calibration Sequence CS5542/CS5543

14

Normal

DS109PP2

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