4305-DEMO THAT Corporation, 4305-DEMO Datasheet - Page 17

• Manufacturer Part Number: 4305-DEMO
• Description: Audio Modules & Development Tools Low-Cost Dynamics Processor Demo Board
• Manufacturer: THAT Corporation

Specifications of 4305-DEMO

• Description/function: Audio DSPs
• Operating Supply Voltage: 15 V
• Product: Audio Modules
• For Use With/related Products: THAT4305
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Document 600067 Rev 01
encoder output level (-56 dBV) corresponding with
an input level of -100 dBV.
Decode In
Encode In
i
i
We'll choose a point about 6 dB above the
R
R
6
12
=
=
RMSOut
RMSOut
R
R
6
12
Op-Amp
Op-Amp
U4
, and
U2
Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com
THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; USA
C12
1u
C11
1u
C1
1u
RMS Pre-emphasis
V+
C18
3n3
3n3
84k5
Pre-emphasis
C7
R8
Signal Path
C14
22u
21k0
R1
8k87
22u
R10
Figure 20. 4305 hi-fi 2:1 encoder circuit
C4
Figure 21. 4305 hi-fi 2:1 decoder circuit
2k32
4k02
R3
R11
R13
5k1
C21
220p
Vcc
C13
10u
15
2
U1B
THAT4305
VCA In
RMS In
U3B
THAT4305
EC+
EC-
11
12
464k
RMS Out
CT
R12
VCA Out
5
4
THAT4305
U1A
RMS Out
10u
C3
15
5
CT
VCA In
RMS In 2
13
4
V
R
The same is true for R12.
0.00316V
8.87k
EC+
IN
6
EC-
=
= 10
11
12
U3A
THAT4305
VCA Out
(−23.6−(−50))$0.0062
=
(
464k
−50dBV
(−23.6−(−50))$0.0062
R6
0.00316V
20
8.87k
13
)
= 3.16mV
Pre-emphasis
R
4k02
6
R5
84k5
RMS
22p
C5
R2
8k87
= 459k l 464k
R4
2k32
21k0
U3
De-emphasis
U5
Signal Path
R9
R7
Op-Amp
Op-Amp
3n3
C8
, And
RMS
C15
C17
22p
3n3
. Therefore,
C2
1u
Page 17 of 20
Decode Out
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