WM8725 Wolfson Microelectronics plc, WM8725 Datasheet - Page 6

• Manufacturer Part Number: WM8725
• Description: 99db Stereo Dac
• Manufacturer: Wolfson Microelectronics plc

WM8725
PIN DESCRIPTION
INTERNAL POWER ON RESET
w
PIN
10
11
12
13
14
1
2
3
4
5
6
7
8
9
LRCIN
DIN
BCKIN
NC
CAP
VOUTR
GND
VDD
VOUTL
MUTE
NC
DEEMPH
FORMAT
SCKI
NAME
The WM8725 includes a n internal power-on reset circuit. This is shown in Figure 1.This
reset circuit is used to reset the digital logic into a default state after power up.
Figure 1 Internal Power on Reset Circuit
The timing of the power on reset is shown in Figure 2 The circuit monitors VDD and VMID
(CAP pin) and asserts PORB low when VMID is below the minimum threshold Vpor. It is
assumed that VMID will rise slower than VCC due to the capacitor on VMID.
Digital input
Digital input
Digital input
No connect
Analogue output
Analogue output
Supply
Supply
Analogue output
Digital input
No connect
Digital input
Digital input
Digital input
TYPE
Sample rate clock input
Serial data input
Bit clock input
No internal connection
Analogue internal reference
Right channel DAC output
0V supply
Positive supply
Left channel DAC output
Mute control, high = muted. Internal pull-down
No internal connection
De-emphasis select, high = de-emphasis ON. Internal pull-up
Data input format select, low = normal, high = I
System clock input (256fs or 384fs)
DESCRIPTION
2
S. Internal pull-up
PD Rev 4.1 August 2004
Production Data
6