CRD-5378 Cirrus Logic Inc, CRD-5378 Datasheet - Page 17

• 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

Analog signal traces out of the CS3301A/02A amplifiers and into the CS5373A modulator are 4-wire
INR+, INF+, INF-, INR- quad groups, and are routed with INF+ and INF- as a traditional differential pair
and INR+ and INR- as guard traces outside the respective INF+ and INF- traces.
2.2.2.3
The CS5373A ∆Σ modulator is 4th order and high frequency input signals can cause instability. Simple
single-pole anti-alias RC filters are required between the CS3301A/02A amplifier outputs and the
CS5373A modulator inputs to bandwidth limit analog signals into the modulator.
For the CRD5378, the CS3301A/02A amplifier outputs are connected to external 680
and a differential anti-alias RC filter is created by connecting 20 nF of high linearity differential capacitance
(2x 10 nF C0G) between each half of the rough and fine signals.
2.2.3
The CS5373A ∆Σ modulator performs the A/D function for differential analog signals from the
CS3301A/02A amplifier. The digital output from the modulator is an oversampled ∆Σ bit stream.
2.2.3.1
The modulator analog inputs are separated into rough and fine signals, each of which has an anti-alias
RC filter to limit the signal bandwidth into the modulator inputs.
DS639RD2
Analog Signals
INR, INF
VREF
Digital Signals
MDATA
MFLAG
MCLK
MSYNC
Delta-Sigma Modulator
Anti-alias RC Filters
Rough-Fine Inputs - INR, INF
Description
Modulator analog rough / fine inputs
Description
Modulator delta-sigma data output
Modulator over-range flag output
Modulator clock input
Modulator synchronization input
Voltage reference analog inputs
Ω
series resistors
CRD5378
17