Datasheet

1−16
Spectrum Analyzer/VU Meter Spectrum Analyzer/VU Meter
BiQuad 1 to 10 Subaddresses = 0xBC to 0xC5
S Slave Addr Ack Sub-Addr a
1
Ack Ack Ack Ack Ackxxxxxxxx
xxxxxxx
l
s
b
xxxxxxxx
m
s
b
xxx0000
a
2
Ack Ack Ack Ackxxxxxxxx xxxxxxx
l
s
b
xxxxxxxx
m
s
b
xxx0000
b
0
Ack Ack Ack Ackxxxxxxxx xxxxxxx
l
s
b
xxxxxxxx
m
s
b
xxx0000
b
1
Ack Ack Ack Ackxxxxxxxx xxxxxxx
l
s
b
xxxxxxxx
m
s
b
xxx0000
b
2
Ack Ack Ack Ackxxxxxxxx xxxxxxx
l
s
b
xxxxxxxx
m
s
b
xxx0000
BiQuad 1
RMS Voltage
Estimator
Spectrum Analyzer / VU Meter
Log
RMS Window Time Constant Subaddress = 0xBB
BiQuad 1
RMS Voltage
Estimator
RMS Voltage
Log
S Slave Addr Ack Sub-Addr asaAck Ack Ack Ack Ackxxxxxxxx xxxxxxx
l
s
b
xxxxxxxx
m
s
b
xxx0000
1−asaAck Ack Ack Ackxxxxxxxx xxxxxxx
l
s
b
xxxxxxxx
m
s
b
xxx0000
BiQuad 2 BiQuad 3
BiQuad 4
r
RMS Voltage
Estimator
RMS Voltage
Estimator
RMS Voltage
Log Log
Log
Spectrum Analyzer Output Subaddress = 0xFD
BiQuad 4
s
co
der
RMS Voltage
Estimator
Log
S Slave Addr Ack Sub-Addr BiQuad 1Ack Ackxxxxx.xxx
BiQuad 2
Ackxxxxx.xxx
BiQuad 3
Ackxxxxx.xxx
BiQuad 4
Ackxxxxx.xxx
BiQuad 5
Ackxxxxx.xxx
BiQuad 6
Ackxxxxx.xxx
BiQuad 7
Ackxxxxx.xxx
BiQuad 8
Ackxxxxx.xxx
BiQuad 9
Ackxxxxx.xxx
BiQuad 10
Ackxxxxx.xxx
BiQuad 5 BiQuad 6 BiQuad 7 BiQuad 9
BiQuad 10
s
t
Sub-Address Dec
od
BiQuad 8
Estimator
RMS Voltage
Estimator
RMS Voltage
Estimator
RMS Voltage
Estimator
RMS Voltage
Estimator
RMS Voltage
Estimator
RMS Voltage
Estimator
t
Window
≈ −1/[F
S
x ln(1−asa)] Where F
S
= Audio Sample Frequency
asa and (1−asa) Set Time Window Over Which RMS Value Is Computed
I
2
C Bus
Log Log Log Log Log Log
VU Meter Output = 0xFE
S Slave Addr Ack Sub-Addr
VU Meter Output 1 (BiQuad 5)
Ack Ackxxxxx.xxx
Ackxxxxx.xxx
VU Meter Output 1 (BiQuad 6)