WM8945
Production Data
ELECTRICAL CHARACTERISTICS
Test Conditions
DCVDD = 1.8V, DBVDD = LDOVDD = SPKVDD = 3.3V, LDOVOUT = 3.0V, GND = 0V,
TA = +25oC, 1kHz signal, fs = 48kHz, PGA gain = 0dB, 24-bit audio data unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
Single-ended input
MIN
TYP
MAX
UNIT
Analogue Inputs (IN1L, IN2L)
Maximum input signal
level (changes in
proportion to LDOVOUT)
1.0
0
Vrms
dBV
Vrms
dBV
k
Pseudo-differential input
0.7
-3.1
3.5
104
166
96
Input resistance (IN1L)
+35.25dB gain
0dB gain
k
-12dB gain
k
Input resistance (IN2L)
Input capacitance
All gain settings
k
10
pF
Analogue Inputs (AUX1, AUX2)
Maximum input signal
level (changes in
proportion to LDOVOUT)
AUX1 or AUX2 enabled as audio
input
1.0
0
Vrms
dBV
Input resistance
Input mixer path (0dB)
100
15
k
k
Output mixer / direct speaker
path (0dB)
Output mixer / direct speaker
path (-6dB)
30
10
k
Input capacitance
pF
Analogue Inputs Programmable Gain Amplifiers (PGAs)
Minimum programmable
gain
-12
dB
dB
Maximum programmable
gain
35.25
Gain step size
Guaranteed monotonic
0.75
92
dB
dB
dB
Mute attenuation
Common Mode
Rejection Ratio
1kHz input
110
Speaker Output Programmable Gain Amplifiers (PGAs)
Minimum programmable
gain
-57
6
dB
dB
Maximum programmable
gain
Gain step size
Guaranteed monotonic
1
dB
dB
Mute attenuation
71
ADC Input Path Performance (Input PGAs to ADC)
SNR (A-weighted)
THD
84
94
-83
-77
77
dB
dB
dB
dB
-1dBFS input
-1dBFS input
217Hz
-75
-70
THD+N
PSRR (with respect to
LDOVDD)
1kHz
90
PD, May 2011, Rev 4.1
10
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
