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PDF SSM-2412 Data sheet ( Hoja de datos )
| Número de pieza | SSM-2412 | |
| Descripción | (SSM2402 / SSM2412) Dual Audio Analog Switches | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
Dual Audio
Analog Switches
SSM2402/SSM2412
FEATURES
“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: VS = ؎18 V; 10 V rms
Wide Power Supply Range: ؎20 V max
Available in Dice Form
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
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 “clicks” during switching.
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
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-
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—a 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
1 page  
SSM2402/SSM2412
SSM2402 TON/TOFF Switching Response
TON/TOFF Switching Response Test Circuit
SSM 2412 TON/TOFF Switching Response
Switch ON/OFF Transition Test Circuit
Switching ON/OFF Transition
“OFF” Isolation Test Circuit
REV. A
–5–
5 Page 
SSM2402/SSM2412
Figure 8. Switcher Functional Block Diagram
The routing switcher bus carries high level unbalanced audio,
but is driven with low impedance sources. With the output im-
pedance of the SSM2015 at virtually 0 Ω and the SSM2402
switch ON, resistance is typically 60 Ω. Bus-to-bus crosstalk is
exceptionally low. For example, assuming 14 pF coupling be-
tween buses and 20 kHz signal, the crosstalk (isolation) exceeds
80 dB. The 14 pF would be representative for the 16 × 1 stereo
design shown. Shielding of the buses with a printed circuit
board ground plane and physically isolating the input and out-
put circuits will reduce the crosstalk even further. The “T” con-
figuration of the SSM2402 switch virtually eliminates crosstalk
between the various input signal sources.
The output amplifier incorporates a buffer amplifier that pro-
vides 4 dB of gain (nominally), with adjustable output level trim
control. The buffer also isolates the switching bus from the bal-
anced output amplifier circuit. The balanced output is designed
to drive 600 Ω loads and utilizes two SSM2134 IC amplifiers.
The differential design increases drive capability, yet increases
the heat dissipation surface area, and keeps IC package tem-
perature well within safe operating limits, even when driving
600 Ω loads. The SSM2134 is recommended due to its low
noise, wide frequency response, and output drive current
capabilities.
Overall performance of the 16 × 1 stereo switcher is noteworthy.
Input-to-output frequency response is flat to within 1 dB over a
10 Hz to 50 kHz band. Total harmonic distortion plus noise is
less than 0.03%, from 20 Hz to 20 kHz. SMPTE intermodula-
tion distortion is less than 0.02%. The use of ± 18 V dc power
supplies produces a +30 dBm clip level, even when driving
600 Ω loads.
Table I. Circuit Performance Specifications
Max Input Level
Input Impedance, Unbalanced
Input Impedance, Balanced
Common-Mode Rejection (20 Hz to 20 kHz)
Common-Mode Voltage Limit
Max Output Level
Output Impedance
Gain Control Range
Output Voltage Slew Rate
Frequency Response (± 0.05 dB)
Frequency Response (± 0.5 dB)
THD + Noise (20 Hz to 20 kHz, +8 dBu)
THD + Noise (20 Hz to 20 kHz, +24 dBu)
IMD (SMPTE 60 Hz & 4 kHz, 4:1, +24 dBu)
Crosstalk (20 Hz to 20 kHz)
S/N Ratio @ 0 dB Gain
+30 dBu
100 kΩ
200 kΩ
>70 dB
± 98 V Peak
+30 dBu/dBm
67 Ω
± 2 dB
6 V/µs
20 Hz to 20 kHz
10 Hz to 50 kHz
0.005%
0.03%
0.02%
>80 dB
135 dB
REV. A
–11–
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| PDF Descargar | [ Datasheet SSM-2412.PDF ] | |
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