CRD-5376 Cirrus Logic Inc, CRD-5376 Datasheet - Page 29

• Manufacturer Part Number: CRD-5376
• Description: Audio Modules & Development Tools Ref Bd LP Mlt-Ch Decimation Filter
• Manufacturer: Cirrus Logic Inc

Specifications of CRD-5376

• Description/function: Audio D/A
• Operating Supply Voltage: 3.3 V
• Product: Audio Modules
• Supply Current: 300 mA
• For Use With/related Products: CS3301A, CS3302A, CS4373A, CS5371A, CS5372A, CS5376A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.4.1
Linear voltage regulators create the positive and negative analog power supply voltages to the analog
components on CRD5376. These regulate the +3.3 V and -3.3 V power supply inputs to create the +2.5 V
and -2.5 V analog power supplies.
The +2.5 V and -2.5 V power supplies to the analog components on CRD5376 include reverse biased
Schottkey diodes to ground to protect against reverse voltages that could latch-up the CMOS analog com-
ponents. Also included on +2.5 V and -2.5 V are several 100 uF bulk capacitors for bypassing and to help
settle transients plus individual 0.1 uF bypass capacitors local to the power supply pins of each device.
2.5
2.5.1
CRD5376 layer 1 is dedicated for analog and digital routing. Critical analog signal routes for channels 1
and 2 are on this layer. Some digital routes for the digital filter are also included on this layer away from
the analog signal routes.
CRD5376 layer 2 is a solid ground plane without splits or routing. A solid ground plane provides the best
return path for bypassed noise to leave the system. No separate analog ground is required since analog
signals on CRD5376 are differentially routed.
CRD5376 layer 3 is dedicated for power supply routing. Each power supply net includes at least 100 µF
bulk capacitance as a charge well for settling transient currents.
CRD5376 layer 4 is dedicated as a digital routing layer with ground fill.
DS612RD2
PCB Layout
Specification
Positive Analog 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
Specification
Negative Analog 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
Analog Voltage Regulators
Layer Stack
Value
+2.5 V
LT1962ES8-2.5
MSOP-8
+/- 25 mV
30 µA, 2 mA
20 µV
> 60 dB
Value
-2.5 V
LT1964ES5-BYP
SOT-23
+/- 30 mV
30 µA, 1.3 mA
20 µV
> 45 dB
RMS
RMS
CRD5376
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