SSM2412P Analog Devices, SSM2412P Datasheet

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SSM2412P

Manufacturer Part Number
SSM2412P
Description
20V; 20mA; audio dual analog switche
Manufacturer
Analog Devices
Datasheet

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Part Number
Manufacturer
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Price
Part Number:
SSM2412P
Manufacturer:
ADI/亚德诺
Quantity:
20 000
a
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.
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
Wide Signal Range: V
Wide Power Supply Range:
Available in Dice Form
S
=
typ
18 V; 10 V rms
20 V max
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
FUNCTIONAL BLOCK DIAGRAM
PIN CONNECTIONS
SSM2402/SSM2412
14-Pin Epoxy DIP
16-Pin SOL
(P-Suffix)
(S-Suffix)
Analog Switches
Dual Audio
Fax: 617/326-8703

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SSM2412P Summary of contents

Page 1

... 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 ...

Page 2

SSM2402/SSM2412–SPECIFICATIONS ELECTRICAL CHARACTERISTICS All specifications, tables, graphs, and application data apply to both the SSM2402 and SSM2412, unless otherwise noted.) Parameter POSITIVE SUPPLY CURRENT NEGATIVE SUPPLY CURRENT GROUND CURRENT DIGITAL INPUT HIGH DIGITAL INPUT LOW LOGIC INPUT CURRENT 3 ANALOG ...

Page 3

... Electrical tests are performed at wafer probe to the limits shown. Due to variations in assembly methods and normal yield loss, yield after packaging is not guaranteed for standard product dice. Consult factory to negotiate specifications based on dice lot qualifications through sample lot assembly and testing. REV Model V V+ –3 SSM2402P SSM2402S SSM2412P SSM2412S Units JC Die Size 0.105 33 C/W 27 C/W is specified for device ...

Page 4

SSM2402/SSM2412–Typical Performance Characteristics Total Harmonic Distortion vs. Frequency SSM2402 Switching Time vs. Temperature Supply Current vs. Temperature “OFF” Isolation vs. Frequency SSM2412 Switching Time vs. Temperature Overvoltage Characteristics –4– “ON” Resistance vs. Analog Voltage Channel Separation vs. Frequency Leakage Current ...

Page 5

SSM2402 T /T Switching Response ON OFF SSM 2412 T /T Switching Response ON OFF Switching ON/OFF Transition REV. A SSM2402/SSM2412 T /T Switching Response Test Circuit ON OFF Switch ON/OFF Transition Test Circuit “OFF” Isolation Test Circuit –5– ...

Page 6

SSM2402/SSM2412 Switching Time Test Circuit Simplified Schematic –6– REV. A ...

Page 7

APPLICATIONS INFORMATION FUNCTIONAL SECTIONS Each half of the SSM2402/SSM2412 are made up of three major functional blocks: 1. “T” Switch Consists of JFET switches S and S 1 switches and switch shunt Ramp Generator Generates ...

Page 8

SSM2402/SSM2412 When the Ramp Output reaches +3 V, and the drive for the Main Switch Control output is gated OFF by differential ampli- fier DA , current sources Q and the OFF state and the 1 3 ...

Page 9

DIGITALLY-CONTROLLED ATTENUATOR Figure 4 shows the usual approach to digitally-controlled at- tenuation. With S closed, the signal passes unattenuated to the 1 output. With S open and S closed, the signal is attenuated and R . ...

Page 10

SSM2402/SSM2412 Figure 7. Switcher Schematic –10– REV. A ...

Page 11

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 switch ON, resistance is typically 60 . Bus-to-bus crosstalk is exceptionally low. For ...

Page 12

SSM2402/SSM2412 0.210 (5.33) 0.160 (4.06) 0.115 (2.93) 0.0118 (0.30) 0.0040 (0.10) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 14-Pin Epoxy DIP (P-Suffix) 0.795 (20.19) 0.725 (18.42 0.280 (7.11) 0.240 (6.10) 0.325 (8.25 0.300 (7.62) 0.060 ...

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