wm8987 Wolfson Microelectronics plc, wm8987 Datasheet - Page 7

• Manufacturer Part Number: wm8987
• Description: Stereo Codec For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

Production Data
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ELECTRICAL CHARACTERISTICS
Test Conditions
DCVDD = 1.5V, DBVDD = 3.3V, AVDD = HPVDD = 3.3V, T
ADCOSR = DACOSR = 1 (64 fs), 24-bit audio data unless otherwise stated.
PARAMETER
Analogue Inputs (LINPUT1, RINPUT1, LINPUT2, RINPUT2) to ADC out
Full Scale Input Signal Level
(for ADC 0dB Input at 0dB Gain)
Input Resistance
Input Capacitance
Signal to Noise Ratio
(A-weighted)
Total Harmonic Distortion
ADC Channel Separation
Channel Matching
DAC to BTL headset drive (left=LOUT2/OUT3, right=ROUT1/ROUT2)
Full scale output voltage
across BTL load
Output Power per channel
Total Harmonic Distortion
Signal to Noise Ratio
(A-weighted)
DAC to single-ended headset drive (LOUT2/ROUT2, using capacitors)
Full scale output voltage
Output Power per channel
Total Harmonic Distortion
Signal to Noise Ratio
(A-weighted)
DAC to single-ended headset drive (capless, using OUT3 as headphone ground)
Full scale output voltage
Output Power per channel
Total Harmonic Distortion
SYMBOL
0dBFS
0dBFS
0dBFS
V
SNR
SNR
SNR
THD
THD
THD
THD
P
P
P
INFS
O
O
O
HPVDD=3.3V, R
HPVDD=3.3V, R
HPVDD=3.3V, R
HPVDD=3.3V, R
AVDD=HPVDD =1.8V,
AVDD=HPVDD =1.8V,
AVDD=HPVDD=1.8V,
AVDD=HPVDD =3.3V
L/RINPUT1 to ADC,
L/RINPUT1 to ADC,
TEST CONDITIONS
L/RINPUT1 unused
L/RINPUT1 unused
PGA gain = +30dB
R
R
DC Measurement
LOUT2, ROUT2
PGA gain = 0dB
ROUT1-ROUT2
L
L
LOUT2-OUT3,
LOUT2-OUT3,
ROUT2-OUT3
=32Ω, P
=16Ω, P
AVDD = 3.3V
AVDD = 1.8V
AVDD = 3.3V
AVDD = 1.8V
-1dBFs input,
AVDD = 3.3V
-1dBFs input,
AVDD = 1.8V
1kHz signal
1kHz signal
P
P
P
P
R
O
O
O
O
Output power is very closely correlated with THD; see below.
L
Output power is very closely correlated with THD; see below.
Output power is very closely correlated with THD; see below.
=5mW
=5mW
=5mW
=5mW
=32Ω
A
= +25
O
O
=5mW
=5mW
L
L
L
L
=32Ω,
=16Ω,
=32Ω,
=16Ω,
o
C, 1kHz signal, fs = 48kHz, PGA gain = 0dB,
MIN
80
80
92
AVDD/1.65
AVDD/3.3
AVDD/3.3
0.545
0.01
0.03
0.04
0.05
0.08
0.09
0.09
TYP
1.0
1.5
-80
-70
-66
-62
-61
-60
0.1
-61
-60
0.1
22
16
17
10
90
87
88
86
98
PD Rev 4.0 August 2008
MAX
0.13
0.25
0.25
-58
-52
-52
WM8987L
V rms
Vrms
Vrms
Vrms
UNIT
kΩ
pF
dB
dB
dB
dB
dB
dB
dB
dB
%
%
%
%
%
7