WM8720 Ver la hoja de datos (PDF) - Wolfson Microelectronics plc
Número de pieza
componentes Descripción
Fabricante
WM8720 Datasheet PDF : 17 Pages
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WM8720
Production Data
ELECTRICAL CHARACTERISTICS
Test Conditions
AVDD, DVDD = 5V, AGND, DGND = 0V, TA = +25oC, fs = 48kHz, SCKI = 256fs unless otherwise stated.
PARAMETER
SYMBOL
DAC Circuit Specifications
SNR (Note 1)
THD
Dynamic range
Passband
Stopband
Pass band ripple
Out of band rejection
Channel Separation
Gain mismatch
channel-to-channel
Digital Logic Levels
Input LOW level
VIL
Input HIGH level
VIH
Output LOW level
VOL
Output HIGH level
VOH
Analogue Output Levels
Output level
Minimum resistance load
Maximum capacitance
load
Output DC level
Reference Levels
Potential divider
resistance
Voltage at CAP
POR
POR threshold
TEST CONDITIONS
AVDD, DVDD = 5V
AVDD, DVDD = 3.3V
0dB FS
THD+N @ -60dB FS
±0.25dB
-3dB
0dB FS
MIN
95
95
0.491
TYP
101
100
-96
101
±0.25
-40
98
±0.5
IOL = 2mA
IOH = 2mA
2.0
AVDD - 0.3V
Into 10kΩ, full scale 0dB,
(5V supply)
Into 10kΩ, full scale 0dB,
(3.3V supply)
To midrail or AC coupled
(5V supply)
To midrail or AC coupled
(3.3V supply)
5V or 3.3V
1.1
0.72
1
1
100
AVDD/2
AVDD to CAP and CAP to AGND
90
AVDD/2
2.0
MAX
-85
0.4535
±5
0.8
AVSS + 0.3V
UNIT
dB
dB
dB
dB
fs
fs
dB
dB
dB
%FSR
V
V
VRMS
VRMS
kΩ
kΩ
pF
V
kΩ
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.
w
PD Rev 4.0. February 2005
5
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