CDB5378 datasheet(18/72 Pages) CIRRUS

18 / 72 page

CDB5378

DS639DB3

The CS3301/02 amplifier outputs include internal series resistors, so 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. External 0-ohm resistors are included in series with the amplifier internal

anti-alias resistors to support testing of other anti-alias RC filter configurations.

2.2.3

Delta-Sigma Modulator

The CS5373A

∆Σ modulator performs the A/D function for the differential analog signal from the

CS3301/02 amplifier. The digital output from the modulator is an oversampled

∆Σ bit stream.

2.2.3.1

Rough-Fine Inputs - INR, INF

The modulator analog inputs are separated into rough and fine signals, each of which has a differential

anti-alias RC filter to limit the input signal bandwidth.

Figure 2. Quad Group Routing of RC Filter Components

INR+

INF+

INF-

INR-

INR+

INF+

INF-

INR-

Analog Signals

Description

INR, INF

Modulator analog rough / fine inputs

VREF

Voltage reference analog inputs

Digital Signals

Description

MDATA

Modulator delta-sigma data output

MFLAG

Modulator over-range flag output

MCLK

Clock input

MSYNC

Synchronization input

CDB5378 Datasheet(PDF) 18 Page - Cirrus Logic