WM8720
Production Data
ELECTRICAL CHARACTERISTICS
Test Conditions
AVDD, DVDD = 5V, AGND, DGND = 0V, TA = +25oC, fs = 48kHz, SCKI = 256fs unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DAC Circuit Specifications
SNR (Note 1)
AVDD, DVDD = 5V
AVDD, DVDD = 3.3V
0dB FS
95
101
100
-96
dB
dB
dB
dB
THD
-85
Dynamic range
Passband
THD+N @ -60dB FS
±0.25dB
95
101
0.4535
fs
fs
Stopband
-3dB
0.491
Pass band ripple
Out of band rejection
Channel Separation
0.25
-40
98
dB
dB
dB
Gain mismatch
0dB FS
0.5
5
%FSR
channel-to-channel
Digital Logic Levels
Input LOW level
VIL
VIH
0.8
V
V
Input HIGH level
2.0
Output LOW level
Output HIGH level
Analogue Output Levels
Output level
VOL
VOH
IOL = 2mA
IOH = 2mA
AVSS + 0.3V
AVDD - 0.3V
Into 10kΩ, full scale 0dB,
1.1
0.72
1
VRMS
VRMS
kΩ
(5V supply)
Into 10kΩ, full scale 0dB,
(3.3V supply)
Minimum resistance load
To midrail or AC coupled
(5V supply)
To midrail or AC coupled
(3.3V supply)
1
kΩ
Maximum capacitance
load
5V or 3.3V
100
pF
V
Output DC level
AVDD/2
Reference Levels
Potential divider
resistance
90
kΩ
AVDD to CAP and CAP to AGND
Voltage at CAP
POR
AVDD/2
POR threshold
2.0
V
TERMINOLOGY
1. Signal-to-noise ratio (dB) (SNR) is a measure of the difference in level between the full-scale output and the output
with no signal applied.
2. Dynamic range (dB) (DNR) is a measure of the difference between the highest and lowest portions of a signal.
Normally a THD+N measurement at 60dB below full scale. The measured signal is then corrected by adding the 60dB
to it. (eg THD+N @ -60dB= -32dB, DR= 92dB).
3. THD+N (dB) is a ratio of the r.m.s. values, of (Noise + Distortion)/Signal.
4. Stop band attenuation (dB) is the degree to which the frequency spectrum is attenuated (outside audio band).
5. Channel Separation (dB) (also known as Cross-Talk) is a measure of the amount one channel is isolated from the
other. Normally measured by sending a full-scale signal down one channel and measuring the other.
6. Pass-Band Ripple - Any variation of the frequency response in the pass-band region.
PD Rev 4.0. February 2005
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
