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THAT2181B Datasheet

  • THAT2181B

  • Trimmable IC Voltage Controlled Amplifiers

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T H AT
Corporation
Trimmable IC
Voltage Controlled Amplifiers
THAT
2181A, 2181B, 2181C
FEATURES
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Wide Dynamic Range: >120 dB
Wide Gain Range: >130 dB
Exponential (dB) Gain Control
Low Distortion:
~0.0025% (typical 2181A)
~0.005% (typical 2181C)
Wide Gain-Bandwidth: 20 MHz
Dual Gain-Control Ports (pos/neg)
Pin-Compatible with 2150-Series
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APPLICATIONS
Faders
Panners
Compressors
Expanders
Equalizers
Filters
Oscillators
Automation Systems
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Description
THAT 2181 Series integrated-circuit voltage con-
trolled amplifiers (VCAs) are very high-performance
current-in/current-out devices with two oppos-
ing-polarity, voltage-sensitive control ports. They offer
wide-range exponential control of gain and attenuation
with low signal distortion. The parts are selected after
packaging based primarily on after-trim THD and con-
trol-voltage feedthrough performance.
The VCA design takes advantage of a fully comple-
mentary dielectric isolation process which offers
closely matched NPN/PNP pairs. This delivers perfor-
mance unobtainable through any conventional pro-
cess, integrated or discrete. The parts are available in
three grades, allowing the user to optimize cost vs.
performance. Both 8-pin single-in-line (SIP) and sur-
face mount (SO) packages are available.
Pin Name
Input
7
SIP Pin
1
2
3
4
5
6
7
8
SO Pin
1
2
3
4
5
6
7
8
Ec+
Ec鈥?/div>
Sym
2k
Vcc
BIAS CURRENT
COMPENSATION
2
Ec+
25
Vbe
MULTI-
PLIER
V鈥?/div>
Gnd
V+
Output
Ec-
3
8
Input
1
6
Output
4
Gnd
Iadj
Sym
Table 1. 2181 Series Pin Assignments
Max Trimmed THD Plastic
SIP
@1 V, 1 kHz, 0 dB
0.005%
0.008%
0.02%
Plastic
SO
5
V-
Iset
2181LA 2181SA
2181LB 2181SB
2181LC 2181SC
Figure 1. 2181 Series Equivalent Circuit Diagram
Table 2. Ordering Information
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
Document 600030 Rev 01

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