THAT2181B ETC1 [List of Unclassifed Manufacturers], THAT2181B Datasheet

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THAT2181B

Manufacturer Part Number
THAT2181B
Description
Trimmable IC Voltage Controlled Amplifiers
Manufacturer
ETC1 [List of Unclassifed Manufacturers]
Datasheet
T H A T
trolled amplifiers (VCAs) are very high-performance
current-in/current-out
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.
Input
Gnd
·
·
·
·
·
·
·
THAT 2181 Series integrated-circuit voltage con-
1
6
COMPENSATION
BIAS CURRENT
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
Figure 1. 2181 Series Equivalent Circuit Diagram
FEATURES
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
C o r p o r a t i o n
Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com
devices
with
two
Document 600030 Rev 01
oppos-
Description
MULTI-
PLIER
2k
Vbe
Iadj
Iset
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.
25
The VCA design takes advantage of a fully comple-
Output
·
·
·
·
·
·
·
·
7
2
3
8
4
Sym
5
Vcc
Ec+
Ec-
V-
THAT 2181A, 2181B, 2181C
Faders
Panners
Compressors
Expanders
Equalizers
Filters
Oscillators
Automation Systems
Voltage Controlled Amplifiers
APPLICATIONS
Max Trimmed THD
@1 V, 1 kHz, 0 dB
Table 1. 2181 Series Pin Assignments
Pin Name
Output
Input
Sym
Gnd
Ec+
Ec–
Table 2. Ordering Information
0.005%
0.008%
V–
V+
0.02%
SIP Pin
Trimmable IC
2181LC 2181SC
2181LA 2181SA
2181LB 2181SB
1
2
3
4
5
6
8
Plastic
7
SIP
SO Pin
Plastic
1
2
3
4
5
6
7
8
SO

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THAT2181B Summary of contents

Page 1

FEATURES · Wide Dynamic Range: >120 dB · Wide Gain Range: >130 dB · Exponential (dB) Gain Control · Low Distortion: ~0.0025% (typical 2181A) ~0.005% ...

Page 2

Page 2 Absolute -Maximum Ratings (T Positive Supply Voltage ( Negative Supply Voltage ( Supply Current ( Max Recommended Operating Conditions Parameter Symbol Positive Supply Voltage V ...

Page 3

Rev 01 Electrical Characteristics (Cont'd.) Parameter Symbol Total Harmonic Distortion THD dBV gain +10 dBV, -15 dB gain dBV, +15 dB gain +10 dBV, ...

Page 4

Page 4 The THAT 2181 Series VCAs are designed for high performance in audio-frequency applications requiring exponential gain control, low distortion, wide dynamic range and low control-voltage feedthrough. These parts control gain by converting an input current signal to a ...

Page 5

Rev 01 ship is temperature dependent. Therefore, the gain of any log-antilog VCA depends on its temperature. Figure 8 shows the effect of temperature on the nega- tive control port. (The positive control port behaves in the same manner.) ...

Page 6

Page 6 Audio Performance The 2181-Series VCA design, fabrication and testing ensure extremely good audio performance when used as recommended. The 2181 maintains low distortion over a wide range of gain, cut and signal levels. Figures 10 through 12 show ...

Page 7

Rev 01 DC Coupling The quiescent dc voltage level at the input (the input offset voltage) is approximately 0 V, but many gen- eral-purpose opamps, this is not well controlled. Any dc input currents will cause dc ...

Page 8

Page 8 There is no reason why both control ports cannot be used simultaneously. Symmetry The SYM pin (pin 4) is actually a sort of additional positive-sense control port provided to allow V mismatches in the core transistors ...

Page 9

Rev 01 To avoid excessive noise, one must take care to use quiet electronics throughout the control-voltage circuitry. One useful technique is to process control voltages at a multiple of the eventual control constant (e.g., 61 mV/dB — ten ...

Page 10

Page 10 THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com Notes THAT2181 Series IC VCAs ...

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