CS5101A datasheet(29/40 Pages) CIRRUS

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1/2 the throughput frequency without significant

errors due to aperture jitter.

Power Supply Rejection

The power supply rejection performance of the

CS5101A and CS5102A is enhanced by the on-

chip self-calibration and an "auto-zero" process.

Drifts in power supply voltages at frequencies

less than the calibration rate have negligible ef-

fect on the device’s accuracy. This is because the

CS5101A and CS5102A adjust their offset to

within a small fraction of an LSB during calibra-

tion. Above the calibration frequency the

excellent power supply rejection of the internal

amplifiers is augmented by an auto-zero process.

Any offsets are stored on the capacitor array and

are effectively subtracted once conversion is initi-

ated. Figure 23 shows power supply rejection of

the CS5101A and CS5102A in the bipolar mode

with the analog input grounded and a 300 mV p-

p ripple applied to each supply. Power supply

rejection improves by 6 dB in the unipolar mode.

CS5101A/CS5102A Improvements Over Ear-

lier CS5101/CS5102

The CS5101A/CS5102A are improved versions

of the earlier CS5101/CS5102 devices. Primary

improvements are:

1) Improved DNL at high temperature

(>70

°C)

2) Improved input slew rate, yielding im-

p ro v ed full scale settlin g b etween

conversions.

3) Mo difyin g th e p revio us SSH pin to

SSH/SDL (Simultaneous Sample Hold/Se-

rial Data Latch). The SSH/SDL new

function provides a logic signal which

frames the 16 data bits in SSC and FRN

serial modes. This signal is ideal for easy

interface to serial to parallel shift registers

(74HC595) and to DSP serial ports.

Table 3 summarizes all the improvements.

Power Supply Ripple Frequency

1 kHz

10 kHz

100 kHz

1 MHz

Figure 23. Power Supply Rejection

CS5101A CS5102A

DS45F2

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