Datasheet

1−17
Spectrum Analyzer/VU Meter Spectrum Analyzer/VU Meter
Biquad 1 to 10 Subaddresses = 0xBC to 0xC5
SubaddrSlave AddrS 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
Ack
Biquad 1
RMS Voltage
Estimator
Spectrum Analyzer / VU Meter
Log
RMS Window Time Constant Subaddress = 0xBB
Biquad 1
RMS Voltage
Estimator
RMS Voltage
Log
SubaddrS Slave Addr Ack 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
cod
er
RMS Voltage
Estimator
Log
SubaddrS Slave Addr Ack 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
Subaddress Dec
ode
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 Subaddr
VU Meter Output 1 (Biquad 5)
Ack Ackxxxxx.xxx
Ackxxxxx.xxx
VU Meter Output 1 (Biquad 6)