WM8725
ELECTRICAL CHARACTERISTICS
Test Conditions
V
DD
= 5V, GND = 0V, T
A
= +25 C, fs = 48kHz, SCKI = 256fs unless otherwise stated.
PARAMETER
Digital Logic Levels
Input LOW level
Input HIGH level
Analogue Output Levels
Load Resistance
To midrail or AC coupled
(5V supply)
To midrail or AC coupled
(3V supply)
Maximum capacitance load
Output DC level
Reference Levels
Potential divider resistance
Voltage at CAP
DAC Circuit Specifications
SNR (Note 1)
Full scale output voltage
THD (Full scale)
THD+N (Dynamic range)
Frequency response
Transition band
Out of band rejection
Channel Separation
Gain mismatch
channel-to-channel
Audio Data Input and System Clock Timing Information
BCKIN pulse cycle time
BCKIN pulse width high
BCKIN pulse width low
BCKIN rising edge to LRCIN edge
LRCIN rising edge to BCKIN
rising edge
DIN setup time
DIN hold time
System clock pulse width high
System clock pulse width low
Notes:
1.
2.
t
BCY
t
BCH
t
BCL
t
BL
t
LB
t
DS
t
DH
t
SCKIH
t
SCKIL
100
50
50
30
30
30
30
13
13
VDD = 5V
VDD = 3V
Into 10kohm VDD = 5V, 0dB
Into 10kohm VDD = 3V, 0dB
0dB
-60dB
0
20,000
-40
90
±1
±5
0.9
90
99
97
1.0
0.6
0.01
92
0.02
1.1
V
DD
to CAP and CAP to GND
VDD = 5V
80
2.3
100
2.5
120
2.7
5V or 3V
1
1
100
V
DD
/2
V
IL
V
IH
2.0
0.8
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
o
Production Data
UNIT
V
V
kΩ
kΩ
pF
V
kΩ
V
dB
dB
V
RMS
V
RMS
%
dB
Hz
Hz
dB
dB
%FSR
20,000
ns
ns
ns
ns
ns
ns
ns
ns
ns
Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured
“A” weighted over a 20Hz to 20kHz bandwidth.
All performance measurements done with 20kHz low pass filter. Failure to use such a filter will result in higher
THD+N and lower SNR and Dynamic Range readings than are found in the Electrical Characteristics. The low pass
filter removes out of band noise; although it is not audible, it may affect dynamic specification values.
w
PD ,Rev 4.3, February 2012
5
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
