PCM1608 datasheet(14/46 Pages) TI2

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POWER-ON AND EXTERNAL RESET FUNCTIONS

Reset

Reset Removal

VDD

2.4 V

2 V

1.6 V

Internal Reset

System Clock

T0014-08

0 V

Don’t Care

1024 System Clocks

Reset Removal

1024 System Clocks

RST

Internal Reset

System Clock

Reset

T0015-06

PCM1608

SBAS164B – DECEMBER 2000 – REVISED JULY 2005

The PCM1608 includes a power-on-reset function, as shown in Figure 20. With the system clock active, and VDD

> 2 V (typical, 1.6 V to 2.4 V), the power-on-reset function is enabled. The initialization sequence requires 1024

system clocks from the time VDD > 2 V. After the initialization period, the PCM1608 is set to its reset default

state, as described in the Mode Control Registers section of this data sheet.

The PCM1608 also includes an external reset capability using the RST input (pin 37). This allows an external

controller or master reset circuit to force the PCM1608 to initialize to its reset default state. For normal operation,

RST should be set to a logic-1.

The external reset operation and timing is shown in Figure 21. The RST pin is set to logic-0 for a minimum of

20 ns. After the initialization sequence is completed, the PCM1608 is set to its reset default state, as described in

the Mode Control Registers section of this data sheet.

During the reset period (1024 system clocks), the analog outputs are forced to the bipolar zero level (or VCC/2).

After the reset period, the internal registers are initialized in the next 1/fS period and, if SCKI, BCK, and LRCK

are provided continuously, the PCM1608 provides proper analog output with the group delay time given in the

Electrical Characteristics section of this data sheet.

The external reset is especially useful in applications where there is a delay between PCM1608 power-up and

system-clock activation. In this case, the RST pin should be held at a logic-0 level until the system clock has

been activated.

Figure 20. Power-On-Reset Timing

Figure 21. External Reset Timing

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