CS5374 datasheet(32/44 Pages) CIRRUS

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CS5374

DS862F1

8. POWER SUPPLIES

The CS5374 has two positive analog power supply

pins (VA+), two negative analog power supply

pins (VA–), a digital power supply pin (VD+), and

a ground pin (GND).

For proper operation, power must be supplied to all

power supply pins, and the ground pin must be con-

nected to system ground. The CS5374 digital pow-

er supply (VD+) and the CS5376A digital power

supply (VD) must share a common voltage.

8.1 Analog Power Supplies

The analog power pins of the CS5374 are to be sup-

plied with a total of 5 V between VA+ and VA–

from a bipolar ±2.5 V supply. When using bipolar

supplies the analog signal common mode voltage

should be biased to 0 V. The analog power supplies

are recommended to be bypassed to system ground

using 0.1

μF X7R type capacitors.

The VA– supply is connected to the CMOS sub-

strate and as such must remain the most negative

applied voltage to prevent potential latch-up condi-

tions. It is recommended to clamp the VA– supply

to system ground using a reverse biased Schottky

diode to prevent possible latch-up conditions relat-

ed to mismatched supply rail initialization.

Care should be taken to connect the CS5374 ther-

mal pad on the bottom of the package to VA–, not

system ground (GND), since it internally connects

to VA– and is expected to be the most negative ap-

plied voltage.

8.2 Digital Power Supply

The digital power supply across the VD and GND

pins is specified for a +3.3 V power supply. The

digital power supply should be bypassed to system

ground using a 0.01

μF X7R type capacitor. The

digital power supply across the VD+ and GND pins

is specified to be +3.3 V.

8.3 Power Supply Bypassing

The VA+ and VA– power supplies should be by-

passed to system ground with 0.1

μF capacitors

placed as close as possible to the power pins of the

device. The VD+ power supply should be bypassed

to system ground with 0.1

μF capacitors placed as

close as possible to the power pins of the device.

Bypass capacitors should be X7R, C0G, tantalum,

or other high-quality dielectric type.

In addition to the local bypass capacitors, at least

100

μF bulk capacitance to system ground should

be placed on each power supply near the voltage

CS5374

VA+

VD+

VA-

GND

0.01 uF

100 uF

0.1 uF

100 uF

0.1 uF

To VA+

Regulator

To VA-

Regulator

To VD

Regulator

VA+

VA-

0.1 uF

Figure 19. Power Supply Diagram

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