WM8725
Production Data
ELECTRICAL CHARACTERISTICS
Test Conditions
VDD = 5V, GND = 0V, TA = +25oC, fs = 48kHz, SCKI = 256fs unless otherwise stated.
PARAMETER
Digital Logic Levels
Input LOW level
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VIL
VIH
0.8
V
V
Input HIGH level
2.0
Analogue Output Levels
Load Resistance
To midrail or AC coupled
(5V supply)
1
1
kΩ
kΩ
To midrail or AC coupled
(3V supply)
Maximum capacitance load
Output DC level
5V or 3V
100
pF
V
V
DD/2
Reference Levels
Potential divider resistance
80
100
2.5
120
2.7
kΩ
V
DD to CAP and CAP to GND
VDD = 5V
Voltage at CAP
2.3
V
DAC Circuit Specifications
SNR (Note 1)
VDD = 5V
VDD = 3V
90
99
97
dB
dB
Full scale output voltage
Into 10kohm VDD = 5V, 0dB
0.9
1.0
0.6
0.01
92
1.1
0.02
VRMS
VRMS
%
Into 10kohm VDD = 3V, 0dB
THD (Full scale)
0dB
THD+N (Dynamic range)
Frequency response
Transition band
-60dB
dB
0
20,000
Hz
20,000
Hz
Out of band rejection
Channel Separation
-40
90
1
dB
dB
Gain mismatch
5
%FSR
channel-to-channel
Audio Data Input and System Clock Timing Information
BCKIN pulse cycle time
tBCY
tBCH
tBCL
tBL
100
50
50
30
30
ns
ns
ns
ns
ns
BCKIN pulse width high
BCKIN pulse width low
BCKIN rising edge to LRCIN edge
LRCIN rising edge to BCKIN
rising edge
tLB
DIN setup time
tDS
tDH
tSCKIH
tSCKIL
30
30
13
13
ns
ns
ns
ns
DIN hold time
System clock pulse width high
System clock pulse width low
Notes:
1. 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.
2. 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.
PD Rev 4.1 August 2004
w
5
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
