CDB5374 Cirrus Logic Inc, CDB5374 Datasheet - Page 31

• Manufacturer Part Number: CDB5374
• Description: Audio Modules & Development Tools 2-Ch DS Modulator & Hydrophone Demo Brd
• Manufacturer: Cirrus Logic Inc

Specifications of CDB5374

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The VA+ and VA- power supplies to the analog components on CDB5374 can be jumper-ed to use regu-
lated bipolar power supplies (+2.5 V, -2.5 V) or unregulated 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 CDB5374. It is recommended to
always use the regulated bipolar analog power supplies for optimal performance.
The VA+ and VA- power supply nets to the analog components on CDB5374 include reverse-biased
Schottky 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
Linear voltage regulators create the positive digital power supply voltages on CDB5374. 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 CDB5374 can be jumper-ed 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 CDB5374.
Even though the Cirrus Logic components on CDB5374 will tolerate up to 5 V from the direct EXT_VD
power supply, other components are specified for +3.3 V operation only and so it is recommended to use
only the regulated +3.3 V jumper setting for VD.
DS862DB1
Specification
Negative Analog Supply, -2.5VA
Low Noise Micropower Regulator - Linear Tech
Surface Mount Package Type
Load Regulation, -40 C to +85 C
Quiescent Current, Current @ 100 mA Load
Output Voltage Noise, 10 Hz - 100 kHz
Ripple Rejection, DC - 200 Hz
Specification
Positive Digital Power Supply
Low Noise Micropower Regulator - Linear Tech
Surface Mount Package Type
Load Regulation, -40 C to +85 C
Quiescent Current, Current @ 100 mA Load
Output Voltage Noise, 10 Hz - 100 kHz
Ripple Rejection, DC - 200 Hz
Digital Voltage Regulators
Value
-2.5 V
LT1964ES5-BYP
SOT-23
+/- 30 mV
30 µA, 1.3 mA
20 µV
> 45 dB
Value
+2.5 V, +3.3 V
LT1763CS8
SO-8
+/- 25 mV
40 µA, 2 mA
20 µV
> 50 dB
RMS
RMS
CDB5374
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