wm9713 Wolfson Microelectronics plc, wm9713 Datasheet - Page 11

• Manufacturer Part Number: wm9713
• Description: Ac?97 Audio + Touchpanel Codec
• Manufacturer: Wolfson Microelectronics plc

Pre-Production
DIGITAL INTERFACE CHARACTERISTICS
Note:
1.
2.
POWER CONSUMPTION
The power consumption of the WM9713L depends on the following factors:
w
Test Conditions
DBVDD = 3.3V, DCVDD = 3.3V, T
Digital Logic Levels (all digital input or output pins) – CMOS Levels
Input HIGH level
Input LOW level
Output HIGH level
Output LOW level
Clock Frequency
Master clock (MCLKA pin)
AC’97 bit clock (BIT_CLK pin)
AC’97 sync pulse (SYNC pin)
Off (lowest possible power)
Clocks stopped. This is the default configuration after power-up.
LPS (Low Power Standby)
VREF maintained using 1MOhm string
Touchpanel only (waiting for pen-down)
PCM Voice call (fs=8kHz)
Record from mono microphone
Stereo DAC Playback (AC link to headphone)
Stereo DAC Playback (AC link to headphone)
PLL running with 13MHz input to MCLKB
Maximum Power - everything on
Table 1 Supply Current Consumption
Notes:
1.
2.
All audio and non-audio sample rates and other timing scales proportionately with the master clock.
For signal timing on the AC-Link, please refer to the AC’97 specification (Revision 2.2)
•
•
•
Unless otherwise specified, all figures are at TA = +25C, audio sample rate fs = 48kHz, with zero signal (quiescent), and
voltage references settled.
The power dissipated in the headphone, speaker and touchpanel is not included in the above table.
Supply voltages: Reducing the supply voltages also reduces digital supply currents, end therefore results in
significant power savings especially in the digital sections of the WM9713L.
Operating mode: Significant power savings can be achieved by always disabling parts of the WM9713L that are
not used (e.g. audio ADC, DAC, touchpanel digitiser).
Sample rates: Running at lower sample rates will reduce power consumption significantly. The figures below are
for 48kHz (unless otherwise specified), but in many scenarios it is not necessary to run at this frequency, e.g.
8kHz PCM voice call scenario uses only 11.4mW (see below).
PARAMETER
MODE DESCRIPTION
A
V
V
V
V
SYMBOL
= +25
IH
IL
OH
OL
o
C, unless otherwise stated.
source current = 2mA
TEST CONDITIONS
sink current = 2mA
DBVDD×0.9
DBVDD×0.7
MIN
3.3
3.3
3.3
3.3
3.3
2.8
3.3
3.3 13.656 3.3 15.472 3.3
Current
Supply
V / mA
AVDD
0.014
0.042
3.644
3.733
4.801
0.01
2.37
24.576
12.288
TYP
48
3.3
3.3
3.3
2.8
3.3 10.973 3.3
3.3
3.3 10.504 3.3
DCVDD
Current
Supply
V / mA
PP Rev 3.2 September 2008
9.720
DBVDD×0.3
DBVDD×0.1
1.7
0
0
0
MAX
3.3
3.3
3.3
2.8
3.3
DBVDD
Current
Supply
V / mA
WM9713L
0.005
0.005
0.005
0.006
2.974 58.05
2.789 53.60
2.814 59.79
2.938 105.82
UNIT
MHz
MHz
kHz
V
V
Power
(mW)
Total
0.05
0.06
0.15
11.4
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