CDB5378 datasheet(31/72 Pages) CIRRUS

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CDB5378

DS639DB3

The VA+ and VA- power supplies to the analog components on CDB5378 can be jumpered to use regu-

lated bipolar power supplies (+2.5 V, -2.5 V), regulated unipolar power supplies (+5 V, GND), or unregu-

lated direct connections (EXT_VA+, EXT_VA-). When using direct connections to EXT_VA+ and

EXT_VA-, extreme care must be taken not to exceed the maximum specified power supply voltages of

the analog components on CDB5378.

Characterization testing has shown the analog components on CDB5378 work best using bipolar analog

power supplies (+2.5 V, -2.5 V) instead of unipolar analog power supplies (+5 V, GND). It is recommend-

ed to always use the regulated bipolar analog power supplies for optimal performance.

The VA+ and VA- power supply nets to the analog components on CDB5378 include reverse-biased

Schottkey diodes to ground to protect against reverse voltages that could latch-up the CMOS analog com-

ponents. Also included on VA+ and VA- are 100 uF bulk capacitors for bypassing and to help settle tran-

sients plus individual 0.1 uF bypass capacitors local to the analog power supply pins of each device.

2.4.2

Digital Voltage Regulators

Linear voltage regulators create the positive digital power supply voltages on CDB5378. Jumper options

select which external power supply input voltage, EXT_VD or EXT_VA+, is supplied to the digital voltage

regulators to create the VD and VCORE power supplies.

The VD and VCORE power supplies on CDB5378 can be jumpered to use regulated +3.3 V or +2.5 V

power supplies or an unregulated direct connection to EXT_VD. Extreme care must be taken when using

a direct connection to EXT_VD not to exceed the maximum specified power supply voltages of the digital

components on CDB5378.

Specification

Value

Negative Analog Supply, -2.5VA

-2.5 V

Low Noise Micropower Regulator - Linear Tech

LT1964ES5-BYP

Surface Mount Package Type

SOT-23

Load Regulation, -40 C to +85 C

+/- 30 mV

Quiescent Current, Current @ 100 mA Load

µA, 1.3 mA

Output Voltage Noise, 10 Hz - 100 kHz

µVRMS

Ripple Rejection, DC - 200 Hz

> 45 dB

Specification

Value

Positive Digital Power Supply

+2.5 V, +3.3 V

Low Noise Micropower Regulator - Linear Tech

LT1763CS8

Surface Mount Package Type

SO-8

Load Regulation, -40 C to +85 C

+/- 25 mV

Quiescent Current, Current @ 100 mA Load

µA, 2 mA

Output Voltage Noise, 10 Hz - 100 kHz

µVRMS

Ripple Rejection, DC - 200 Hz

> 50 dB

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