Manualshelf

Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Custom audio Digital audio interfacing I²C TSSOP 38
101102103104105106107108109110
3−46
BiQuad 1
BiQuad 2
BiQuad 3
BiQuad 4
BiQuad 5
BiQuad 6
BiQuad 7
BiQuad 9
BiQuad 10
Node
t
RMS Voltage
Estimator
Sub-Address Decoder
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 Sub-Addr Ack xxxxxxxx xxxxxxxx xxxxxx
l
s
b
m
s
b
xxx0000 Ack Ack Ack Ack
S Slave Addr Ack Sub-Addr Ack xxxxxxxx xxxxxxxx xxxxxx
l
s
b
m
s
b
xxx0000 Ack Ack Ack Ack
Mixer Gain Coefficient
Sub-Address Format
BiQuad Filter Coefficients Sub-Address 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
Sub-Addresses 0xBC (BiQuad 1) − 0xC5 (BiQuad 10)
G
Mix:
o
to
r
→
Sub-Address 0x84
G
Mix:
o
to
s
→Sub-Address 0x85
G
Mix:
p
to
r
→Sub-Address 0x86
G
Mix:
p
to
t
→Sub-Address 0x87
G
Mix:
q
to
r
→Sub-Address 0x88
G
Mix:
r
to
s
&
t
→Sub-Address 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
Channel 1
Node r
G
Mix:
p
to
t
G
Mix:
p
to
r
Node p
Channel 2
G
Mix:
q
to
r
Node q
Channel 3
S Slave Addr Ack Sub-Addr Ack xxxxx.xxx Ack
Spectrum Analyzer Outputs Sub-Address Format
BiQuad 1
Sub-Address 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 Sub-Addr Ack xxxxx.xxx Ack
VU Meter Outputs
Sub-Address Format
VU Meter
Output 1
(BiQuad 5)
Sub-Address 0xFE
xxxxx.xxx Ack
VU Meter
Output 1
(BiQuad 6)
S Slave Addr Ack Sub-Addr Ack xxxxxxxx xxxxxxxx xxxxxx
l
s
b
m
s
b
xxx0000 Ack Ack Ack Ack
RMS Voltage Estimator Coefficients
Sub-Address Format
xxxxxxxx xxxxxxxx xxxxxx
l
s
b
m
s
b
xxx0000 Ack Ack Ack Ack
asa
1−asa
Sub-Address 0xBB
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
Figure 3−27. Spectrum Analyzer/VU Meter Block Diagram