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OVERFLOW FLAG FOR PCM

1/fS

90/fS

Converted Data(2)

Zero Data

Undefined

Data

Normal Data

Synchronous

Asynchronous

Synchronous

Resynchronization

Synchronization Lost

DATA(1)

State of Synchronization

T0020-06

PCM1804

SLES022C – DECEMBER 2001 – REVISED OCTOBER 2007

The PCM1804 has two overflow flag pins, OVFR (pin 20) and OVFL (pin 21). The pins go to high as soon as the

analog input goes across the full-scale range. The high level is held for 1.016 s at maximum, and returns to low if

the analog input does not go across the full-scale range for the period.

(1)

Applies only for slave mode; the loss of synchronization never occurs in master mode.

(2)

The HPF transient response appears initially.

Figure 41. ADC Digital Output for Loss of Synchronization and Resynchronization

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