Analog Devices SSM2412S, SSM2412P, SSM2402S, SSM2402P Datasheet

Dual Audio

a

FEATURES
“Clickless” Bilateral Audio Switching
Guaranteed “Break-Before-Make” Switching
Low Distortion: 0.003% typ
Low Noise: 1 nV/√
Superb OFF-Isolation: 120 dB typ
Low ON-Resistance: 60 V typ
Wide Signal Range: V
Wide Power Supply Range: 620 V max
Available in Dice Form

GENERAL DESCRIPTION

The SSM2402/SSM2412 are dual analog switches designed spe­cifically 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 conven­tional 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 be­fore 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 bipolar­JFET switches relative to CMOS switching technology. Based
on a new circuit topology that optimizes audio performance,
the SSM2402/SSM2412 make use of a proprietary bipolar­JFET process with thin-film resistor network capability. Nitride
capacitors, which are very area efficient, are used for the propri­etary ramp generator that controls the switch resistance transi­tion. 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.

Hz

= 618 V; 10 V rms

S

Analog Switches

SSM2402/SSM2412

FUNCTIONAL BLOCK DIAGRAM

PIN CONNECTIONS

14-Pin Epoxy DIP

(P-Suffix)

16-Pin SOL

(S-Suffix)

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] Fax: [phone]

SSM2402/SSM2412–SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

(@ VS = 618 V, RL = OPEN, and –408C ≤ TA ≤ +858C unless otherwise noted.

All specifications, tables, graphs, and application data apply to both the SSM2402 and SSM2412, unless otherwise noted.)

SSM2402/SSM2412

Parameter Symbol Conditions Min Typ Max Units

POSITIVE SUPPLY CURRENT +I
NEGATIVE SUPPLY CURRENT –I
GROUND CURRENT I
DIGITAL INPUT HIGH V
DIGITAL INPUT LOW V
LOGIC INPUT CURRENT I
ANALOG VOLTAGE RANGE
ANALOG CURRENT RANGE

3

3

SY

SY

GND

INH
INL

LOGIC

V

ANALOG

I

ANALOG

OVERVOLTAGE INPUT CURRENT VIN = ±V
SWITCH ON RESISTANCE R

ON

VIL = 0.8 V, 2.0 V
VIL = 0.8 V, 2.0 V
VIL = 0.8 V, 2.0 V
TA = Full Temperature Range 20 V
TA = Full Temperature Range 0.8 V
VIN = 0 V to 15 V

SUPPLY

–14.2 V ≤ VA ≤ +14.2 V
IA = ±10 mA, VIL = 2.0 V
T

= +25°C6085Ω

A

T

= Full Temperature Range 115 Ω

A

Tempco (∆RON/∆T) 0.2 Ω/°C

RON MATCH RON MATCH –14.2 V ≤ VA ≤ +14.2 V 1 5 %

IA = ±10 mA, VIL = 2.0 V

SWITCH ON LEAKAGE CURRENT I

S(ON)

VIL = 2.0 V
–14.2 V ≤ V
VA = 0 V 0.05 10.0 nA

SWITCH OFF LEAKAGE CURRENT I

S(OFF)

VIL = 0.8 V
–14.2 V ≤ V
VA = 0 V 0.05 10.0 nA

TURN-ON TIME

4

t

ON

VA = +10 V, RL = 2 kΩ SSM2402 10.0 ms
TA = +25°C, See Test Circuit SSM2412 3.5

TURN-OFF TIME

5

t

OFF

VA = +10 V, RL = 2 kΩ SSM2402 4.0 ms
TA = +25°C, See Test Circuit SSM2412 1.5

BREAK-BEFORE-MAKE t

TIME DELAY

6

OFF–tON

TA = +25°C SSM2402 6.0 ms

CHARGE INJECTION Q TA = +25°C SSM2402 50 pC

ON-STATE INPUT CS

(ON)

VA = 1 V rms 12 pF

CAPACITANCE f = 5 kHz, TA = +25°C

OFF-STATE INPUT CS

(OFF)

VA = 1 V rms 4 pF

CAPACITANCE f = 5 kHz, TA = +25°C

OFF ISOLATION I

SO(OFF)

VA = 10 V rms, 20 Hz to 20 kHz 120 dB
TA = +25°C, See Test Circuit

CHANNEL-TO-CHANNEL C

T

VA = 10 V rms, 20 Hz to 20 kHz 96 dB

CROSSTALK TA = +25°C

TOTAL HARMONIC THD 0 V to 10 V rms, 20 Hz to 20 kHz 0.003 0.01 %

DISTORTION

SPECTRAL NOISE DENSITY e

7

n

TA = +25°C, RL = 5 kΩ
20 Hz to 20 kHz, TA = +25°C 1 nV/√Hz

WIDEBAND NOISE DENSITY en p-p 20 Hz to 20 kHz, TA = +25°C 0.2 µV p-p

NOTES

1

“VIL” is the Logic Control Input.

2

Current tested at VIN = 0 V. This is the worst case condition.

3

Guaranteed by RON test condition.

4

Turn-ON time is measured from the time the logic input reaches the 50% point to the time the output reaches 50% of the final value.

5

Turn-OFF time is measured from the time the logic input reaches the 50% point to the time the output reaches 50% of the initial value.

6

Switch is guaranteed by design to provide break-before-make operation.

7

THD guaranteed by design and dynamic RON testing.

Specifications subject to change without notice.

1
1
1

2

6.0 7.5 mA

4.8 6.0 mA

0.6 1.5 mA

1.0 5.0 µA
–14.2 +14.2 V
–10 +10 mA

±40 mA

≤ +14.2 V 0.05 1.0 µA

A

≤ +14.2 V 0.05 1.0 µA

A

SSM2412 2.0

SSM2412 150

–2–

REV. A

SSM2402/SSM2412

ABSOLUTE MAXIMUM RATINGS

Operating Temperature Range . . . . . . . . . . . –40°C to +85°C

Operating Supply Voltage Range . . . . . . . . . . . . . . . . . ±20 V

Analog Input Voltage Range

Continuous . . . . . . . . . . . . . . V– +3.5 V ≤ V

≤ V+ –3.5 V

A

Maximum Current Through Switch . . . . . . . . . . . . . . 20 mA

Logic Input Voltage Range . . . . . . . . . . . . V+ Supply to –2 V

V+ Supply to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . +36 V

V– Supply to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . –20 V

V

to V– Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +36 V

A

Package Type uJA* u

JC

Units

14-Pin Plastic DIP (P) 76 33 °C/W
16-Pin SOL (S) 92 27 °C/W

*θJA is specified for worst case mounting conditions, i.e., θJA is specified for device

in socket for P-DIP package; θJA is specified for device soldered to printed circuit
board for SOL package.

ORDERING GUIDE

Temperature Package

Model Range Description

SSM2402P –40°C to +85°C 14-Pin Plastic DIP
SSM2402S –40°C to +85°C 16-Pin SOL

SSM2412P –40°C to +85°C 14-Pin Plastic DIP
SSM2412S –40°C to +85°C 16-Pin SOL

DICE CHARACTERISTICS

Die Size 0.105 × 0.097 Inch, 10,185 sq. mils

(2.667 × 2.464 mm, 6.57 sq. mm)

Timing Diagram

W AFER TEST LIMITS

Parameter Symbol Conditions

POSITIVE SUPPLY CURRENT +I
NEGATIVE SUPPLY CURRENT –I
GROUND CURRENT I

LOGIC INPUT CURRENT I
SWITCH ON RESISTANCE R

SY

SY

GND

LOGIC

ON

VIL = 0.8 V 7.5 mA max
VIL = 0.8 V 6.0 mA max
VIL = 0.8 V 1.5 mA max

VIN = 0 V
–14.2 V ≤ VA ≤ +14.2 V 85 Ω max

IA = ±10 mA, VIL = 2.0 V

MATCH BETWEEN SWITCHES RON MATCH –14.2 V ≤ VA ≤ +14.2 V 5 % max

R

ON

IA = ±10 mA, VIL = 2.0 V
SWITCH ON LEAKAGE CURRENT I
SWITCH OFF LEAKAGE CURRENT I

NOTES

1

VIL = Logic Control Input; VA = Applied Analog Input Voltage; IA = Applied Analog Input Current.

2

Worst Case Condition.
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.

S(ON)
S(OFF)

–14.2 V ≤ VA ≤ +14.2 V, VIL = 2.0 V 1.0 µA max
–14.2 V ≤ VA ≤ +14.2 V, VIL = 0.8 V 1.0 µA max

1

2

Limit Units

5.0 µA max

REV. A

–3–

SSM2402/SSM2412–T ypical Performance Characteristics

Total Harmonic Distortion vs.
Frequency

SSM2402 Switching Time
vs. Temperature

“OFF” Isolation vs. Frequency

SSM2412 Switching Time
vs. Temperature

“ON” Resistance vs. Analog Voltage

Channel Separation vs. Frequency

Supply Current vs. Temperature

Overvoltage Characteristics

Leakage Current vs. Analog Voltage

REV. A–4–