THAT4311 Datasheet, PDF (5/12 Pages) List of Unclassifed Manufacturers – Low-voltage, Low-power Analog Engine Dynamics Processor

Rev. 08/30/01
Preliminary Information
Page 5
Representative Data (Companding Noise Reduction)
Fig 11. End-to-End Transfer Function, 1kHz
Fig 12. End-to-End THD+N
Fig 13. Encoder Transfer Function, 1kHz
Fig 14. Encoder Frequency Response 20-20kHz
+5
Vref
R9
R8
R7
V+
51R
50k
20k
22kHz 3 pole BW filter
Encoder
In ^C2
+
3u3
R2
200k
R1
200k _U1D
THAT4311
20
19 _+
18
R3
C4
+
8k06
3u3
R13
2k
C1
10n
V+
C16 ⁺
10u
U1E
11 _{Vcc Vref} 9
10 ^Vref 8
Vee Cap
THAT4311
+ _C3
10u
C5
270p
R6
R5
17
EC+ SYM
IN VCA OUT
15k
EC-
30k
_
OA3 ¹²
+
R4
6k19
U1A
THAT4311
Vref
Vref
U1B
C6
4 _OUT
IN ^{1 +}
5 RMS 2
TC
Iset
10u
C7 ⁺ THAT4311 _R12
10u
+ _C8
261k
22u
R10
6k19 _C9
570p
6
R31
3_{_}
4k32
C10
OA2 ⁷
+
4n7 ^{Vref U1C}
THAT4311
R11A
Encoder
Out
20k
R11B _VR1
10k
20k
optional
Fig 15. THAT 4311 Noise Reduction Encoder Schematic
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com