WM8983GEFL/RV Wolfson Microelectronics, WM8983GEFL/RV Datasheet - Page 26

• Manufacturer Part Number: WM8983GEFL/RV
• Description: Audio CODECs Mbl Multimedia CODEC w/ 1W Speaker Driver
• Manufacturer: Wolfson Microelectronics

Specifications of WM8983GEFL/RV

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-32
• Minimum Operating Temperature: - 25 C

WM8983
Figure 14 DAC Power Up and Down Sequence (not to scale)
w
Table 4 Typical POR Operation (typical simulated values)
DAC Group Delay
Notes:
1.
2.
3.
4.
5.
6.
t
t
t
t
hp__midrail_off
line_midrail_on
line_midrail_off
hp_midrail_on
SYMBOL
The analogue input pin charge time, t
time is dependent upon the value of VMID decoupling capacitor and VMID pin input resistance
and AVDD power supply rise time.
The analogue input pin discharge time, t
capacitor discharge time. The time, t
analogue input but will vary dependent upon the value of input coupling capacitor.
While the ADC is enabled there will be LSB data bit activity on the ADCDAT pin due to system
noise but no significant digital output will be present.
The VMIDSEL and BIASEN bits must be set to enable analogue input midrail voltage and for
normal ADC operation.
ADCDAT data output delay from power up - with power supplies starting from 0V - is
determined primarily by the VMID charge time. ADC initialisation and power management bits
may be set immediately after POR is released; VMID charge time will be significantly longer
and will dictate when the device is stabilised for analogue input.
ADCDAT data output delay at power up from device standby (power supplies already applied)
is determined by ADC initialisation time, 2/fs.
t
dacint
MIN
TYPICAL
29/fs
300
300
2/fs
>6
>6
MAX
midrail_on,
midrail_off
midrail_off,
is determined by the VMID pin charge time. This
, is measured using a 1µF capacitor on the
UNIT
n/fs
n/fs
ms
ms
s
s
is determined by the analogue input coupling
PD Rev 4.0 November 2006
Production Data
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