WM8727
Production Data
ELECTRICAL CHARACTERISTICS
Test Conditions
VDD = 5V, GND = 0V, TA = +25oC, fs = 48kHz, MCLK = 256fs unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Digital Logic Levels (TTL Levels)
Input LOW level
VIL
VIH
0.8
V
V
Input HIGH level
2
Output LOW
VOL
VOH
I
OL = 2mA
0.10 x VDD
V
V
Output HIGH
I
OH = 2mA
0.9 x VDD
DAC Output (Load = 10kΩ 50pF)
0dBFs Full scale output voltage
At DAC outputs
1.2 x
VDD/5
98
VRMS
dB
SNR (Note 1,2)
SNR (Note 1,2)
SNR (Note 1,2)
SNR (Note 1,2)
A-weighted,
@ fs = 48kHz
A-weighted
@ fs = 96kHz
A-weighted
@ fs = 192kHz
A-weighted,
@ fs = 48kHz
VDD = 3.3V
A-weighted
95
92
95
dB
dB
dB
SNR (Note 1,2)
95
dB
@ fs = 96kHz
VDD = 3.3V
SNR (Note 1,2)
Non ‘A’ weighted @ fs
= 48kHz
92
dB
THD
1kHz, 0dBFs
-84
98
dB
dB
Dynamic range (Note 2)
1kHz, THD+N @
-60dBFs
Analogue Output Levels
Output level
Load = 10kΩ, 0dBFS
Load = 10kΩ, 0dBFS,
1.2
0.79
VRMS
VRMS
(VDD = 3.3V)
Gain mismatch
channel-to-channel
1
1
%FSR
kΩ
Minimum resistance load
To midrail or a.c.
coupled
To midrail or a.c.
coupled
1
kΩ
(VDD = 3.3V)
Maximum capacitance load
Output d.c. level
5V or 3.3V
100
pF
V
VDD/2
Power On Reset (POR)
POR threshold
1.8
V
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, and where noted an A-weight 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.
3. Power down occurs 1.5µs after MCLK stops.
PD Rev 4.2 July 2006
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
