Cirrus-logic CDB5374 Bedienungsanleitung PDF herunterladen (Seite 17)

CDB5374

DS862DB1 17

The amplifier outputs are connected to external 680 Ω series resistors 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 Delta-Sigma Modulators

A CS5374 ∆Σ modulator performs the A/D function for a differential analog input signal from the amplifier.

The digital output is an oversampled ∆Σ bit streams.

2.2.3.1 Rough-Fine Inputs - INR, INF

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.

2.2.3.2 Offset Enable - OFST

The CS5374 ∆Σ modulator requires differential offset to be enabled to eliminate idle tones for a terminated

input. OFST is enabled by default in the CS5374 registers.

Analog Signals Description

INR1, INF1 Channel 1 analog rough / fine inputs

INR2, INF2 Channel 2 analog rough / fine inputs

VREF Voltage reference analog inputs

Digital Signals Description

MDATA[1..2] Modulator delta-sigma data outputs

MFLAG[1..2] Modulator over-range flag outputs

MCLK Modulator clock input

MSYNC Modulator synchronization input

PWDN[1..2] Power down mode enable (register bits)

OFST Internal offset enable (register bits)

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Cirrus-logic CDB5374 Bedienungsanleitung Seite 17