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Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Custom audio Digital audio interfacing I²C TSSOP 38
111112113114115116117118119120
3−47
Subaddress Decoder
Biquad 1
Biquad 2
Biquad 3
Biquad 4
Biquad 5
Biquad 6
Biquad 7
Biquad 9
Biquad 10
Node
t
RMS Voltage
Estimator
Spectrum Analyzer / VU Meter
Biquad 8
RMS Voltage
Estimator
RMS Voltage
Estimator
RMS Voltage
Estimator
RMS Voltage
Estimator
RMS Voltage
Estimator
RMS Voltage
Estimator
RMS Voltage
Estimator
RMS Voltage
Estimator
RMS Voltage
Estimator
I
2
C Bus
Log
Log
Log
Log
Log
Log
Log
Log
Log
Log
S Slave Addr Ack Subaddr Ack xxxxxxxx xxxxxxxx xxxxxx
l
s
b
m
s
b
xxx0000 Ack Ack Ack Ack
S Slave Addr Ack Subaddr Ack xxxxxxxx xxxxxxxx xxxxxx
l
s
b
m
s
b
xxx0000 Ack Ack Ack Ack
Mixer Gain Coefficient
Subaddress Format
Biquad Filter Coefficients Subaddress Format
xxxxxxxx xxxxxxxx xxxxxx
l
s
b
m
s
b
xxx0000 Ack Ack Ack Ack
a
1
a
2
xxxxxxxx xxxxxxxx xxxxxx
l
s
b
m
s
b
xxx0000 Ack Ack Ack Ack
b
0
xxxxxxxx xxxxxxxx xxxxxx
l
s
b
m
s
b
xxx0000 Ack Ack Ack Ack
b
1
xxxxxxxx xxxxxxxx xxxxxx
l
s
b
m
s
b
xxx0000 Ack Ack Ack Ack
b
2
Subaddresses 0xBC (Biquad 1) − 0xC5 (Biquad 10)
G
Mix:
o
to
r
→Subaddress 0x84
G
Mix:
o
to
s
→Subaddress 0x85
G
Mix:
p
to
r
→Subaddress 0x86
G
Mix:
p
to
t
→Subaddress 0x87
G
Mix:
q
to
r
→Subaddress 0x88
G
Mix:
r
to
s
&
t
→Subaddress 0x89
s
Node
t
Σ
Σ
Σ
G
Mix:
o
to
s
G
Mix:
r
to
s
&
t
G
Mix:
o
to
r
Node o
CH1
Node r
G
Mix:
p
to
t
G
Mix:
p
to
r
Node p
CH2
G
Mix:
q
to
r
Node q
CH3
S Slave Addr Ack Subaddr Ack xxxxx.xxx Ack
Spectrum Analyzer Outputs Subaddress Format
Biquad 1
Subaddress 0xFD
xxxxx.xxx Ack Biquad 2
xxxxx.xxx Ack Biquad 3
xxxxx.xxx Ack Biquad 4
xxxxx.xxx Ack Biquad 5
xxxxx.xxx Ack Biquad 6
xxxxx.xxx Ack Biquad 7
xxxxx.xxx Ack Biquad 8
xxxxx.xxx Ack Biquad 9
xxxxx.xxx Ack Biquad 10
S Slave Addr Ack Subaddr Ack xxxxx.xxx Ack
VU Meter Outputs
Subaddress Format
VU Meter
Output 1
(Biquad 5)
Subaddress 0xFE
xxxxx.xxx Ack
VU Meter
Output 1
(Biquad 6)
S Slave Addr Ack Subaddr Ack xxxxxxxx xxxxxxxx xxxxxx
l
s
b
m
s
b
xxx0000 Ack Ack Ack Ack
RMS Voltage Estimator Coefficients
Subaddress Format
xxxxxxxx xxxxxxxx xxxxxx
l
s
b
m
s
b
xxx0000 Ack Ack Ack Ack
asa
1−asa
Subaddress 0xBB
t
Window
≈ −1/[Fs x ln(1−asa)] Where Fs = Audio Sample Frequency
asa and (1−asa) Set Time Window Over Which RMS Value Is Computed
Figure 3−29. Spectrum Analyzer/VU Meter Block Diagram