CRD-5378 Cirrus Logic Inc, CRD-5378 Datasheet - Page 27

• Manufacturer Part Number: CRD-5378
• Description: Audio Modules & Development Tools Ref Bd LP Sngl-Ch Decimation Filter
• Manufacturer: Cirrus Logic Inc

Specifications of CRD-5378

• Description/function: Audio D/A
• Operating Supply Voltage: 3.3 V
• Product: Audio Modules
• Supply Current: 100 mA
• For Use With/related Products: CS3302A, CS5373A, CS5378
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.3.5
Power supplies and telemetry signals route to J26, a 20-pin double row connector with 0.1" spacing. This
header provides a compact standardized connection to the CRD5378 external signals.
2.4
Power is supplied to CRD5378 through the +3.3 V and -3.3 V voltage inputs on the external connector
(J26), which are typically from an external AC-DC or DC-DC converter. Digital circuitry on CRD5378 is
driven directly from the +3.3 V input, while on-board linear regulators create +2.5 V and - 2.5 V analog
power supplies from +3.3 V and -3.3 V.
The +3.3 V and -3.3 V power supply inputs have zener protection diodes that limit the maximum input volt-
ages to +5 V or -5 V with respect to ground. Each input also has 68 uF bulk capacitance for bypassing
and to help settle transients and another 0.01 uF capacitor to bypass high frequency noise.
2.4.1
Linear voltage regulators create the positive and negative analog power supply voltages to the analog
components on CRD5378. 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.
DS639RD2
Power Supplies
Pins
1, 2
3, 4
5, 6
7, 8
9, 10
11, 12
13, 14
15, 16
17, 18
19, 20
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
External Connector
Analog Voltage Regulators
Name
CLK+, CLK-
SYNC+, SYNC-
SCL+, SCL-
SDA+, SDA-
TX, GND
RX, GND
-3.3V, GND
+3.3V, GND
BYP_SDA+, BYP_SDA-
BYP_SCL+, BYP_SCL-
Signal
Clock Input
Synchronization Input
I2C Clock
I2C Clock Bypass
UART receive
Negative Power Supply
I2C Data
I2C Data Bypass
UART transmit
Positive Power Supply
Value
+2.5 V
LT1962ES8-2.5
MSOP-8
+/- 25 mV
30 µA, 2 mA
20 µV
> 60 dB
RMS
CRD5378
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