Advanced Information
WM9707
Test Characteristics:
AVSS = 5V, GND = 0V …………..TA = 0oC to +70oC, unless otherwise stated
DVDD = 3.3V, GND = 0V …………..TA = 0oC to +70oC, unless otherwise stated
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ADC Circuit Specifications (AVDD = 3.3V) 48kHz sampling
SNR A-weighted (Note 1)
85
0.7
80
dB
Vrms
dB
ADC input for full scale output
THD
VREF = 1.65V
-6dBv input
Frequency response
Transition band
Stop band
20
19,200
28,800
Hz
19,200
28,800
-74
Hz
Hz
Stop band rejection
PSRR
dB
20 to 20kHz
40
dB
Mixer Circuit Specifications (AVDD = 3.3V) 48kHz sampling
SNR CD path A-weighted
(Note 1)
95
90
dB
dB
SNR Other paths A-weighted
(Note 1)
Maximum input voltage
0.6
1.2
Vrms
Vrms
Maximum output voltage on
LINEOUT
THD (Note 2)
-3.6dBv input
85
dBv
Hz
Frequency response (+/-1dB)
Input impedance (CD inputs)
20
20,000
At any gain
At max gain
At 0db gain
At max gain
At 0db gain
20 to 20kHz
15
20
kohm
kohm
kohm
kohm
kohm
dB
Input impedance (other Mixer
inputs)
100
30
Input impedance MIC inputs
110
50
PSRR
Clock Frequency Range
Crystal clock
24.576
12.288
48.0
MHz
MHz
kHz
BIT_CLK frequency
SYNC frequency
Notes:
1. SNR is the ratio of 0dB signal output to the output level with no signal, measured A-weighted over a 20Hz to 20kHz
bandwidth.
2. Inputs are scaled for AVDD eg; 0dBv at 5.0V is equivalent to –3.6dBv at 3.3V.
WOLFSON MICROELECTRONICS LTD
AI Rev 2.2 January 2001
5
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
