WM8739 查看數據表（PDF） - Wolfson Microelectronics plc
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WM8739 Datasheet PDF : 35 Pages
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WM8739 / WM8739L
Advanced Information
ELECTRICAL CHARACTERISTICS
Test Conditions
AVDD, DBVDD = 3.3V, AGND = 0V, DCVDD = 3.3V, DGND = 0V, TA = +25oC, Slave Mode, fs = 48kHz, XTI/MCLK = 256fs
unless otherwise stated.
PARAMETER
SYMBOL TEST CONDITIONS
MIN
TYP
MAX
UNIT
Digital Logic Levels (CMOS Levels)
Input LOW level
VIL
Input HIGH level
VIH
Output LOW
VOL
0.7 x VDD
0.3 x VDD
V
V
0.1 x VDD
V
Output HIGH
VOH
0.9 x VDD
V
Analogue Reference Levels
Reference voltage
Potential divider resistance
VVMID
RVMID
AVDD/2
50K
V
Ohms
Input to ADC
Input Signal Level (0dB)
VINLINE
AVDD = 3.3V
1.0
Vrms
0
dB
AVDD = 1.8V
0.316
0.545
Vrms
(WM8739 only)
-10
-5.27
dBV
Signal to Noise Ratio (Note 1,2)
SNR A-weighted, 0dB gain
85
90
dB
A-weighted, 0dB gain
90
dB
@ fs = 96kHz
A-weighted, 0dB gain,
88
dB
AVDD = 2.7V
A-weighted, 0dB gain,
76
dB
AVDD = 1.8V
(WM8739L only)
Dynamic Range (Note 2)
DNR
A-weighted, -60dBV
85
90
dB
Total Harmonic Distortion
THD -1dBV input, 0dB gain
-84
-74
dB
0.006
0.02
%
-10dBV, 0dB gain
-74
dB
0.02
%
ADC channel separation
1kHz input
90
dB
Programmable Gain
1kHz input
-34.5
0
+12
dB
Rsource < 50 Ohms
Programmable Gain Step Size
1.5
dB
Mute attenuation
0dB, 1kHz input
80
dB
Input Resistance
RINLINE
0dB gain
20k
30k
Ohms
12dB gain
10k
15k
Ohms
Input Capacitance
CINLINE
10
pF
Notes
1. Ratio of output level with 1kHz full scale input, to the output level with all zero’s into the digital input over a 20Hz to
20kHz bandwidth using an Audio analyser.
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. VMID decoupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance).
AI Rev 2.2 September 2001
5
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