WM8524GEDT/R Wolfson Microelectronics, WM8524GEDT/R Datasheet - Page 10

• Manufacturer Part Number: WM8524GEDT/R
• Description: DAC, STEREO, 2VRMS, 2CH, 16TSSOP
• Manufacturer: Wolfson Microelectronics

Specifications of WM8524GEDT/R

• Resolution (bits): 24bit
• Sampling Rate: 192kSPS
• Input Channel Type: Serial
• Digital Ic Case Style: TSSOP
• No. Of Pins: 16
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC (15-Dec-2010)
• Package: RoHS Compliant
• Supply Voltage Range - Analogue: 2.97V To 3.63V
• Rohs Compliant: Yes

WM8524
POWER ON RESET CIRCUIT
w
Figure 3 Internal Power on Reset Circuit Schematic
The WM8524 includes an internal Power-On-Reset circuit, as shown in Figure 3, which is used to
reset the DAC digital logic into a default state after power up. The POR circuit is powered by AVDD
and has as its inputs VMID and LINEVDD. It asserts POR low if VMID or LINEVDD are below a
minimum threshold.
Figure 4 Typical Power Timing Requirements
Figure 4 shows a typical power-up sequence where LINEVDD comes up with AVDD. When AVDD
goes above the minimum threshold, V
asserted low and the chip is held in reset. In this condition, all writes to the control interface are
ignored.
registers are in their default state and writes to the control interface may take place.
On power down, PORB is asserted low whenever LINEVDD or AVDD drop below the minimum
threshold V
After VMID rises to V
pora_low
.
pord_hi
pora
and AVDD rises to V
, there is enough voltage for the circuit to guarantee POR is
pora_hi,
POR is released high and all
PD, Rev 4.0, June 2010
Production Data
10