Product Preview
WM8750L
Test Conditions
o
DCVDD = 1.5V, DBVDD = 3.3V, AVDD = HPVDD = 3.3V, T
A
= +25 C, 1kHz signal, fs = 48kHz, PGA gain = 0dB, 24-bit audio
data unless otherwise stated.
PARAMETER
Output Power per channel
Total Harmonic Distortion
SYMBOL
P
O
THD
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Headphone Output (LOUT1/ROUT1, using capacitors)
Output power is very closely correlated with THD; see below.
HPVDD=1.8V, R
L
=32Ω
P
O
=5mW
HPVDD=1.8V, R
L
=16Ω
P
O
=5mW
HPVDD=3.3V, R
L
=32Ω,
P
O
=20mW
HPVDD=3.3V, R
L
=16Ω,
P
O
=20mW
Signal to Noise Ratio
(A-weighted)
Output Power
Total Harmonic Distortion
SNR
HPVDD = 3.3V
HPVDD = 1.8V
0.013
-78
0.013
-78
0.01
-80
0.01
-80
90
90
dB
%
dB
Speaker Output (LOUT2/ROUT2 with 8
:
bridge tied load, ROUT2INV=1)
P
O
THD
Po=180mW, R
L
=8Ω,
HPVDD=3.3V
Po=400mW, R
L
=8Ω
HPVDD=3.3V
Signal to Noise Ratio
(A-weighted)
Analogue Reference Levels
Midrail Reference Voltage
Potential Divider Resistance
Buffered Reference Voltage
Microphone Bias
Bias Voltage
Bias Current Source
Output Noise Voltage
Digital Input / Output
Input HIGH Level
Input LOW Level
Output HIGH Level
Output LOW Level
HPDETECT (pin 23)
Input HIGH Level
Input LOW Level
V
IH
V
IL
0.7×AVDD
V
IH
V
IL
V
OH
V
OL
I
OL
=1mA
I
OH
-1mA
0.9×DBVDD
0.7×DBVDD
V
MICBIAS
I
MICBIAS
Vn
1K to 20kHz
–3%
VMID
R
VMID
VREF
–3%
–3%
SNR
HPVDD=3.3V, R
L
=8Ω
HPVDD=2.5V, R
L
=8Ω
Output power is very closely correlated with THD; see below.
-50
0.3
-40
1
90
90
AVDD/2
50
AVDD/2
0.9×AVDD
15
+3%
+ 3%
3
+3%
V
kΩ
V
V
mA
nV/√Hz
V
0.3×DBVDD
0.1×DBVDD
V
V
V
V
0.3×AVDD
V
dB
dB
%
PP Rev 1.77 May 2003
7
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
