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SSM-2412 Datasheet

  • SSM-2412

  • Dual Audio Analog Switches

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a
FEATURES
鈥淐lickless鈥?Bilateral Audio Switching
Guaranteed 鈥淏reak-Before-Make鈥?Switching
Low Distortion: 0.003% typ
Low Noise: 1 nV/鈭欻z
Superb OFF-Isolation: 120 dB typ
Low ON-Resistance: 60 typ
Wide Signal Range: V
S
= 18 V; 10 V rms
Wide Power Supply Range: 20 V max
Available in Dice Form
GENERAL DESCRIPTION
Dual Audio
Analog Switches
SSM2402/SSM2412
FUNCTIONAL BLOCK DIAGRAM
The SSM2402/SSM2412 are dual analog switches designed spe-
cifically for high performance audio applications. Distortion and
noise are negligible over the full audio operating range of 20 Hz to
20 kHz at signal levels of up to 10 V rms. The SSM2402/
SSM2412 offer a monolithic integrated alternative to expensive
and noisy relays or complex discrete JFET circuits. Unlike conven-
tional general-purpose CMOS switches, the SSM2402/SSM2412
provide superb fidelity without audio 鈥渃licks鈥?during switching.
Conventional TTL or CMOS logic can be used to control the
switch state. No external pull-up resistors are needed. A 鈥淭鈥?/div>
configuration provides superb OFF-isolation and true bilateral
operation. The analog inputs and outputs are protected against
overload and overvoltage.
An important feature is the guaranteed 鈥渂reak-before-make鈥?/div>
for
all
units, even IC-to-IC. In large systems with multiple
switching channels, all separate switching units must open be-
fore any switch goes into the ON-state. With the SSM2402/
SSM2412, you can be certain that multiple circuits will all
break-before-make.
The SSM2402/SSM2412 represent a significant step forward in
audio switching technology. Distortion and switching noise are
significantly reduced in the new SSM2402/SSM2412 bipolar-
JFET switches relative to CMOS switching technology. Based
on a new circuit topology that optimizes audio performance,
the SSM2402/SSM2412 make use of a proprietary bipolar-
JFET process with thin-film resistor network capability. Nitride
capacitors, which are very area efficient, are used for the propri-
etary ramp generator that controls the switch resistance transi-
tion. Very wide bandwidth amplifiers control the gate-to-source
voltage over the full audio operating range for each switch. The
ON-resistance remains constant with changes in signal amplitude
and frequency, thus distortion is very low, less than 0.01% max.
The SSM2402 is the first analog switch truly optimized for
high-performance audio applications. For broadcasting and
other switching applications which require a faster switching
time, we recommend the SSM2412鈥攁 dual analog switch with
one-third of the switching time of the SSM2402.
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
PIN CONNECTIONS
14-Pin Epoxy DIP
(P-Suffix)
16-Pin SOL
(S-Suffix)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703

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