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PDF SA2159 Data sheet ( Hoja de datos )
| Número de pieza | SA2159 | |
| Descripción | VOLTAGE CONTROLLED AMPLIFIER | |
| Fabricantes | Silan Microelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SA2159 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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SA2159
VOLTAGE CONTROLLED AMPLIFIER FOR ELECTRONIC VOLUME CONTROL
DESCRIPTION
The SA2159 is a voltage-controlled amplifier (VCA) circuit. The chip is a
high-performance current–in/current-out devices including two opposing-
polarity, voltage-sensitive control ports. Due to super low-noise
application, the circuit adopts high hFE. Complementary NPN/PNP pairs
configuration. It requires little external support circuitry and selects a
space-efficient plastic 8-pin single–in–line (SIP) package. The SA2159
VCA combines a number of advantages such as low noise, low distortion,
low offset and high gain-bandwidth to offer discrete performance at IC
prices.
SIP-8
FEATURES
* Wide dynamic range:>115dB
* Wide gain range:>130dB
* Logarithmic gain control
* Low distortion:(0.008%@0dB gain, 0.035%@15dB gain)
* Wide gain-bandwidth: 6MHz
* Single in–line package
* Dual gain-control ports(pos/neg)
ORDERING INFORMATIONS
Device
SA2159
Package
SIP-8
www.DataSheet4U.com
BLOCK DIAGRAM
APPLICATIONS
* Faders
* Expanders
* Compressors
* Equalizers
* Oscillators
* Filters
* Automation systems
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
Rev: 1.0 2005.04.22
Page 1 of 11
1 page  
SA2159
Negative input currents
For negative input currents, the operation of Q1/D1 and Q3/D3 is symmetric with Q2/D2 and Q4/D4. pin 2 is
connected to ground, or very nearly ground potential (see the section below on symmetry adjustment for more
detail), Since the top pair versus the bottom pair transistors are inverted (NPN/PNP) and the bases are cross-
connected between the input (left) half and the output (right) half of each pair, the polarity (positive/negative, in
dB) of the gain is the same.
Symmetry adjustment
The layout design construction of the devices assures relatively good matching between the paired transistors,
but even small VBE mismatches can cause a dc output current to flow in pin 8, which will ultimately manifest itself
as a DC offset voltage. The DC offset voltage will be modulated by gain commands, and may become audible as
“thumps”if gain commands changes very large and fast.
Transistor matching also affects distortion. If the top half of the gain cell is perfectly matched, while the bottom
half is not well match, then the gain commanded by the voltage at pin 3 will affect the two halves of the core
differently. Since positive and negative halves of input signals are handled by separate parts of the core, this
gives rise to even order distortion production.
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Figure 3. Typical THD versus symmetry voltage
Accordingly, the base of Q1 and Q4 are brought out to pin 2 and pin 4, respectively. This allows applying a
small static voltage differential to the two bases. The applied voltage differential must be set to the sum of the
Vbe mismatches around the core. Typical applications diagram includes a typical symmetry voltage application
circuitry. The symmetry trim pot controls primarily even-order harmonic distortion, and is adjusted for minimum
distortion in the output waveform.
Opposite polarity control
As may be seen from the equation, the bases of Q1 and Q4 can also be used as an additional control port,
which can be used as opposite control port of pin 3. Both pins must be applied to the control voltage
simultaneously, while the voltage applied between the two pins must be small difference. (A typical connection is
shown in Figure 4.) Either pin 3, or pins 2 and 4, or both ports together may be used for gain control.
Mathematically:Av = 10 - EC- / 0.118, or Gain = 20 log Av = - EC- / 0.0059, where the unit of Gain is dB.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
Rev: 1.0 2005.04.22
Page 5 of 11
5 Page 
TYPICAL APPLICATION CIRCUIT
PACKAGE OUTLINE
SIP-8
www.DataSheet4U.com
SA2159
Unit: mm
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
Rev: 1.0 2005.04.22
Page 11 of 11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet SA2159.PDF ] | |
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