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PDF THAT2180B Data sheet ( Hoja de datos )
| Número de pieza | THAT2180B | |
| Descripción | Pre-Trimmed IC Voltage-Controlled Amplifiers | |
| Fabricantes | THAT | |
| Logotipo |  |
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THAT Corporation
FEATURES
• Wide Dynamic Range: >120 dB
• Wide Gain Range: >130 dB
• Exponential (dB) Gain Control
• Low Distortion: <0.01% (2180A)
• No External Trim Required
• Wide Gain-Bandwidth: 20 MHz
• Dual Gain-Control Ports (pos/neg)
• Pin-Compatible with 2150-Series
Pre-Trimmed IC
Voltage-Controlled Amplifiers
THAT 2180A, 2180B, 2180C
APPLICATIONS
• Faders
• Panners
• Compressors
• Expanders
• Equalizers
• Filters
• Oscillators
• Automation Systems
Description
THAT 2180 Series integrated-circuit voltage-con-
trolled amplifiers (VCAs) are very high-performance
current-in/current-out devices with two opposing-
polarity, voltage-sensitive control ports. They offer
wide-range exponential control of gain and attenu-
ation with low signal distortion. The parts are
trimmed at wafer stage for low THD and control-
voltage feedthrough without further adjustment.
The VCA design takes advantage of a fully com-
plementary dielectric isolation process which offers
closely matched NPN/PNP pairs, to deliver discrete
performance at IC prices. The parts are available in
three grades, selected for factory-trimmed distor-
tion, allowing the user to optimize cost vs. perfor-
mance. Both 8-pin single-in-line (SIP) and surface
mount (SO) packages are available.
BIAS CURRENT
COMPENSATION
Input
1
Gnd
6
7
Vcc
Vbe
MULTI-
PLIER
2
Ec+
Ec-
3
Output
8
SYM
4
Iadj
V-
5
Iset
Figure 1. 2180 Series Equivalent Circuit Diagram
Pin Name
Input
Ec+
Ec–
Sym
V–
Gnd
V+
Output
SIP Pin
1
2
3
4
5
6
7
8
SO Pin
1
2
3
4
5
6
7
8
Table 1. 2180 Series Pin Assignments
Max THD @1 V,
1 kHz, 0 dB
0.01%
0.02%
0.05%
Plastic
SIP
2180LA
2180LB
2180LC
Plastic
SO
N/A
2180SB
2180SC
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
Free Datasheet http://www.Datasheet4U.com
1 page  
Rev. 6/24/99
Figure 8 shows the effect of temperature on the neg-
ative control port. (The positive control port behaves in
the same manner.) Note that the gain at Ec = 0 V is
0 dB, regardless of temperature. Changing temperature
changes the scale factor of the gain by 0.33%/˚C,
which pivots the curve about the 0 dB point.
Mathematically, the 2180’s gain characteristic is
Gain
=
EC+−EC−
(0.0061) (1 + 0.0033
∆T)
,
Eq. 1
where ∆T is the difference between room temperature
(25˚C) and the actual temperature, and Gain is the
gain in decibels. At room temperature, this reduces to
Gain
=
Ec+ − Ec−
0.0061
.
Eq. 2
If only the positive control port is used, this be-
comes
Gain
=
EC+
0.0061
.
Eq. 3
If only the negative control port is used, this be-
comes
Gain
=
−EC−
0.0061
.
Eq. 4
DC Bias Currents
The 2180 current consumption is determined by the
resistor between pin 5 (V-) and the negative supply
voltage (VEE). Typically, with 15V supplies, the resistor
is 5.1 kΩ, which provides approximately 2.4 mA. This
current is split into two paths: 650 µA is used for bias-
ing the IC, and the remainder becomes Icell as shown
in Figure 5. Icell is further split in two parts: about
20 µA biases the core transistors (Q1 through Q4), the
rest is available for input and output signal current.
DC Feedthrough
Normally, a small dc error term flows in pin 8 (the
output). When the gain is changed, the dc term
changes. This control-voltage feedthrough is more pro-
nounced with gain; the –A version of the part produces
the least feedthrough, the –C version the most. See Fig-
ure 9 for typical curves for dc offset vs. gain.
Audio Performance
The 2180-Series VCA design, fabrication and testing
ensure extremely good audio performance when used
as recommended. In particular, the 2180 maintains
Page 5
low distortion over a wide range of gain, cut and signal
levels. Figures 10 through 12 show typical distortion
performance for representative samples of each grade
of the part. Figure 13 shows the harmonic content of
the distortion in a typical B–grade part.
Figure 10. Typ. 1kHz THD+N vs. Input Level, 0 dB Gain
Figure 11. Typ. 1kHz THD+N vs. Input Level, +15 dB
Gain
Figure 12. Typ. 1kHz THD+N vs. Input Level, -15 dB
Gain
Figure 9. Typical DC Offset vs. Gain
Figure 13. FFT of THD, 0dB gain, 1kHz, 0dBV, Typical
2180B
THAT Corporation; 45 Sumner Street; Milford, Massachusetts, 01757-1656; USA
Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com
Free Datasheet http://www.Datasheet4U.com
5 Page | ||
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