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WM8987L Datasheet(PDF) 6 Page - Wolfson Microelectronics plc

Part No. WM8987L
Description  Stereo CODEC for Portable Audio Applications
Download  58 Pages
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Maker  WOLFSON [Wolfson Microelectronics plc]
Homepage  http://www.wolfsonmicro.com
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WM8987L Datasheet(HTML) 6 Page - Wolfson Microelectronics plc

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WM8987L
Pre-Production
w
PP Rev 3.0 January 2007
6
ELECTRICAL CHARACTERISTICS
Test Conditions
DCVDD = 1.5V, DBVDD = 3.3V, AVDD = HPVDD = 3.3V, TA = +25
oC, 1kHz signal, fs = 48kHz, PGA gain = 0dB,
ADCOSR = DACOSR = 1 (64 fs), 24-bit audio data unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Analogue Inputs (LINPUT1, RINPUT1, LINPUT2, RINPUT2) to ADC out
AVDD = 3.3V
1.0
Full Scale Input Signal Level
(for ADC 0dB Input at 0dB Gain)
VINFS
AVDD = 1.8V
0.545
V rms
L/RINPUT1 to ADC,
PGA gain = 0dB
22
L/RINPUT1 to ADC,
PGA gain = +30dB
1.5
L/RINPUT1 unused
DC Measurement
16
Input Resistance
L/RINPUT1 unused
17
k
Input Capacitance
10
pF
AVDD = 3.3V
80
90
Signal to Noise Ratio
(A-weighted)
SNR
AVDD = 1.8V
87
dB
-1dBFs input,
AVDD = 3.3V
-80
0.01
Total Harmonic Distortion
THD
-1dBFs input,
AVDD = 1.8V
-70
0.03
dB
%
ADC Channel Separation
1kHz signal
88
dB
Channel Matching
1kHz signal
0.04
%
DAC to BTL headset drive (left=LOUT2/OUT3, right=ROUT1/ROUT2)
Full scale output voltage
across BTL load
0dBFS
LOUT2-OUT3,
ROUT1-ROUT2
AVDD/1.65
Vrms
Output Power per channel
PO
Output power is very closely correlated with THD; see below.
AVDD=HPVDD=1.8V,
RL=32
Ω, PO=5mW
-66
0.05
-58
0.13
Total Harmonic Distortion
THD
AVDD=HPVDD =1.8V,
RL=16
Ω, PO=5mW
-62
0.08
dB
%
Signal to Noise Ratio
(A-weighted)
SNR
AVDD=HPVDD =1.8V,
RL=32
80
86
dB
DAC to single-ended headset drive (LOUT2/ROUT2, using capacitors)
Full scale output voltage
0dBFS
LOUT2, ROUT2
AVDD/3.3
Vrms
Output Power per channel
PO
Output power is very closely correlated with THD; see below.
HPVDD=3.3V, RL=32
Ω,
PO=5mW
-61
0.09
-52
0.25
Total Harmonic Distortion
THD
HPVDD=3.3V, RL=16
Ω,
PO=5mW
-60
0.1
-52
0.25
dB
%
Signal to Noise Ratio
(A-weighted)
SNR
AVDD=HPVDD =3.3V
92
98
dB
DAC to single-ended headset drive (capless, using OUT3 as headphone ground)
Full scale output voltage
0dBFS
LOUT2-OUT3,
ROUT2-OUT3
AVDD/3.3
Vrms
Output Power per channel
PO
Output power is very closely correlated with THD; see below.
HPVDD=3.3V, RL=32
Ω,
PO=5mW
-61
0.09
Total Harmonic Distortion
THD
HPVDD=3.3V, RL=16
Ω,
PO=5mW
-60
0.1
dB
%


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