CS5501-SD datasheet(20/54 Pages) CIRRUS

20 / 54 page

Tables 3 and 4 indicate the output code size and

output coding of the CS5501/CS5503 in its vari-

ous modes. The calibration equations which

represent the CS5501/CS5503 transfer function

are shown in Figure 10.

DOUT = Slope (AIN - Unipolar Offset) + 0.5 LSB

a. Unipolar Calibration

CS5501

DOUT = Slope (AIN - Bipolar Offset) + 2

+ 0.5 LSB16

CS5503

DOUT = Slope(AIN - Bipolar Offset) + 2

+ 0.5 LSB20

b. Bipolar Calibration

Figure 10. Calibration Equations

Underrange And Overrange Considerations

The input signal range of the CS5501/CS5503

will be determined by the mode in which the part

is calibrated.

Table 4 indicates the input signal

range in the various modes of operation. If the

input signal exceeds the full scale point the con-

verter will output all ones. If the signal is less

than the zero scale point (in unipolar) or more

negative in magnitude than minus the full scale

point (in bipolar) it will output all zeroes.

Note that the modulator-filter combination in the

chip CS5501/CS5503 is designed to accurately

convert and filter input signals with noise excur-

sions which extend up to 100 mV below the

analog value which produces all zeros out or

above the analog value which produces all ones

out. Overrange noise excursions greater than

100 mV may increase output noise.

All pins of the CS5501/CS5503 include diodes

which clamp the input signals to within the posi-

tive and negative supplies. If a signal on any pin

(including AIN) exceeds the supply voltage (either

Cal Mode

Zero Scale

Gain Factor

1LSB

Unipolar

Bipolar

CS5501

CS5503

CS5501

CS5503

Self-Cal

AGND

VREF

65,536

VREF

1,048,526

2VREF

65,536

2VREF

1,048,526

System Cal

SOFF

SGAIN

−SOFF

65,536

SGAIN

−SOFF

1,048,526

(SGAIN−SOFF)

65,536

(SGAIN−SOFF)

1,048,526

Table 3. Output Code Size After Calibration

Input Voltage, Unipolar Mode

Input Voltage, Bipolar Mode

System-Cal

Self-Cal

Output Codes (Hex)

Self-Cal

System Cal

CS5501

CS5503

>(SGAIN - 1.5 LSB)

>(VREF - 1.5 LSB)

FFFF

FFFFF

>(VREF - 1.5 LSB)

>(SGAIN - 1.5 LSB)

SGAIN - 1.5 LSB

VREF - 1.5 LSB

FFFF

FFFE

FFFFF

FFFFE

VREF - 1.5 LSB

SGAIN - 1.5 LSB

(SGAIN - SOFF)/2 - 0.5 LSB VREF/2 - 0.5 LSB

8000

7FFF

80000

7FFFF

AGND - 0.5 LSB

SOFF -0.5 LSB

SOFF + 0.5 LSB

AGND + 0.5 LSB

0001

0000

00001

00000

-VREF+ 0.5 LSB

-SGAIN + 2SOFF + 0.5 LSB

<(SOFF + 0.5 LSB)

<(AGND+0.5 LSB)

0000

00000

<(-VREF+0.5 LSB)

<(-SGAIN+2SOFF+0.5 LSB)

Table 4. Output Coding

CS5501/CS5503

DS31F2

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