SSM2412_15 Datasheet, PDF (1/12 Pages) Analog Devices – Dual Audio Analog Switches

a
Dual Audio
Analog Switches
SSM2402/SSM2412
FEATURES
FUNCTIONAL BLOCK DIAGRAM
“Clickless” Bilateral Audio Switching
Guaranteed “Break-Before-Make” Switching
Low Distortion: 0.003% typ
Low Noise: 1 nV/√Hz
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
The SSM2402/SSM2412 are dual analog switches designed spe-
E _{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/
T ^{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 “clicks” during switching.
E _{Conventional TTL or CMOS logic can be used to control the}
switch state. No external pull-up resistors are needed. A “T”
configuration provides superb OFF-isolation and true bilateral
L ^{operation. The analog inputs and outputs are protected against}
overload and overvoltage.
An important feature is the guaranteed “break-before-make”
for all units, even IC-to-IC. In large systems with multiple
switching channels, all separate switching units must open be-
O _{fore any switch goes into the ON-state. With the SSM2402/}
SSM2412, you can be certain that multiple circuits will all
break-before-make.
S ^{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,
B _{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-
O ^{etary ramp generator that controls the switch resistance transi-}
PIN CONNECTIONS
14-Pin Epoxy DIP
(P-Suffix)
16-Pin SOL
(S-Suffix)
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—a dual analog switch with
one-third of the switching time of the SSM2402.
REV. A
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