CS5372A datasheet(21/32 Pages) CIRRUS

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CS5371A CS5372A

DS748F2

6. POWER MODES

The CS5371A and CS5372A modulators have

three power modes. Normal operation, power

down with MCLK enabled, and power down

with MCLK disabled.

6.1 Normal Operation

With MCLK active and the PWDN pin driven

low, the CS5371A and CS5372A modulators

perform normal data acquisition. A differential

analog input signal is converted to an over-

sampled 1-bit

ΔΣ bit stream at 512 kHz. This

ΔΣ bit stream is then digitally filtered and deci-

mated by the CS5376A device to a high-preci-

sion 24-bit output.

6.2 Power Down, MCLK Enabled

With MCLK active and the PWDN pin driven

high, the CS5371A and CS5372A modulators

are placed into a power-down state. During

this power-down state the modulators are dis-

abled and all outputs are high impedance.

6.3 Power Down, MCLK Disabled

If MCLK is stopped, an internal loss-of-clock

detection circuit automatically places the

CS5371A and CS5372A into a power-down

state. This power-down state is independent of

the PWDN pin setting and is automatically in-

voked after approximately 40

μs without re-

ceiving an incoming MCLK edge.

During this power-down state, the modulators

are disabled and all outputs are high imped-

ance. When used with the CS5376A digital fil-

ter, the CS5371A and CS5372A are in this

power-down state immediately after reset

since MCLK is disabled by default.

NORMAL OPERATION

MCLK = ON

PWDN = 0

POWER DOWN

MCLK = ON

PWDN = 1

POWER DOWN

MCLK = OFF

PWDN = X

Figure 13. Power Mode Diagram

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