CS5376A datasheet(39/107 Pages) CIRRUS

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CS5376A

10. MODULATOR INTERFACE

The CS5376A performs digital filtering for up to

four

∆Σ modulators. Signals from the modulators

are connected through the modulator data interface

(MDI).

10.1 Pin Descriptions

MCLK, MCLK/2 - Pins 13, 12

Modulator clock outputs. Nominally 2.048 MHz

and 1.024 MHz.

MSYNC - Pin 14

Modulator synchronization signal output. Generat-

ed from the SYNC input.

MDATA1 - MDATA4 - Pins 15, 17, 19, 21

Modulator data inputs, nominally 512 kbit/s.

MFLAG1 - MFLAG4 - Pins 16, 18, 20, 22

Modulator flag inputs. Driven high when modula-

tor is unstable due to an analog over-range signal.

10.2 Modulator Clock Generation

The MCLK and MCLK/2 outputs are low-jitter,

low-skew modulator clocks generated from the

32.768 MHz master clock.

MCLK typically operates at 2.048 MHz unless an-

alog low-power modes require a 1.024 MHz mod-

ulator clock. MCLK/2 always produces a clock at

half the selected MCLK rate.

The MCLK rate is selected and the MCLK and

MCLK/2 outputs are enabled by bits in the digital

filter CONFIG register (0x00). By default MCLK

and MCLK/2 are disabled and driven low.

10.3 Modulator Synchronization

The MSYNC output signal follows an input on the

SYNC pin. MSYNC phase aligns the modulator

sampling instant to guarantee synchronous analog

sampling across a measurement network.

MSYNC is enabled by a bit in the CONFIG register

(0x00). By default SYNC inputs do not cause an

MSYNC output.

Figure 20. Modulator Data Interface

FIR

IIR

Filters

Filter

Output to High Speed Serial Data Port (SD Port)

DC Offset

Correction

Output Rate 4000 SPS ~ 1 SPS

& Gain

MDATA[4:1]

MFLAG[4:1]

MDI Input

512 kHz

MCLK /

Generate

MSYNC

CLK

SYNC

MSYNC

SINC

Filter

MCLK

MCLK/2

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