SSM2404P Analog Devices Inc, SSM2404P Datasheet

IC SWITCH QUAD SPST 20DIP

SSM2404P

Manufacturer Part Number
SSM2404P
Description
IC SWITCH QUAD SPST 20DIP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of SSM2404P

Rohs Status
RoHS non-compliant
Function
Switch
Circuit
4 x SPST - NO
On-state Resistance
45 Ohm
Voltage Supply Source
Single, Dual Supply
Voltage - Supply, Single/dual (±)
11 V ~ 24 V, ± 5.5 V ~ 12 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Through Hole
Package / Case
20-DIP (0.300", 7.62mm)
a
GENERAL DESCRIPTION
The SSM2404 integrates four SPST analog switches in a single
20-pin package. Developed specifically for high performance
audio applications, distortion and noise are negligible over the
full operating range of 20 Hz to 20 kHz. With very low charge
injection of 35 pC, “clickless” audio switching is possible, even
under the most demanding conditions.
Switch control is realized by conventional TTL or CMOS
logic. Guaranteed “break-before-make” operation assures that
all switches in a large system will open before any switch
reaches the ON state.
Single or dual supply operation is possible. Additional features
include –100 dB OFF isolation, –94 dB crosstalk and 28
resistance. Optional current-mode switching permits an
extended signal-handling range. Although optimized for large
load impedances, the SSM2404 maintains good audio
performance even under low load impedance conditions.
REV. B
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
“CIickless” Bilateral Audio Switching
Four SPST Switches in a 20-Pin Package
Ultralow THD+N: 0.0008% @ 1 kHz (2 V rms,
Low Charge Injection: 35 pC typ
High OFF Isolation: –100 dB typ (R
Low Crosstalk: –94 dB typ (R
Low ON Resistance: 28
Low Supply Current: 900 A typ
Single or Dual Supply Operation: +11 V to +24 V or
Guaranteed Break-Before-Make
TTL and CMOS Compatible Logic Inputs
Low Cost-Per-Switch
R
L
5.5 V to
= 100 k )
12 V
typ
L
= 10 k
L
= 10 k
@ 1 kHz)
@ 1 kHz)
ON
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
CONTROL
BLOCK DIAGRAM OF ONE SWITCH CHANNEL
CONTROL
DIGITAL
SW1 CONTROL
SW2 CONTROL
BREAK-BEFORE-MAKE
SW1 A
SW2 B
SW2 A
LOGIC INTERFACE
SW1 B
AGND
AGND
DGND
Epoxy Mini-DIP (P Suffix)
NC
*
CONTROL
CONNECT TO ANALOG GROUND
PIN CONNECTIONS
*
FOR BEST NOISE ISOLATION
and SOIC (S Suffix)
AND
10
1
2
3
4
5
6
7
8
9
NC = NO CONNECT
SW1
SW1
SW2
(Not to Scale)
Quad Audio Switch
SSM2404
TOP VIEW
O
SW4
SW3
GENERATOR
RAMP
19
18
17
16
15
14
13
12
20
11
SSM2404
SW4 A
SW4 B
V+
SW4 CONTROL
SW3 CONTROL
V–
SW3 B
SW3 A
AGND
AGND
V–
V+
Fax: 617/326-8703
SW1 A
SW1 B

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SSM2404P Summary of contents

Page 1

FEATURES “CIickless” Bilateral Audio Switching Four SPST Switches in a 20-Pin Package Ultralow THD+N: 0.0008 kHz (2 V rms 100 Low Charge Injection typ High OFF Isolation: –100 dB typ ...

Page 2

... ON OFF V = 2.4 V INH V = 0.8 V INL V Single Supply S Dual Supply I All Channels On SY+ I All Channels On SY– All Channels On 13.5 V Model S S SSM2404P SSM2404S *N = Plastic DIP SOIC C/W is specified for device JA –2– = +25 C.) A Min Typ Max 0.0008 0.8 0 –20 0.1 +20 –20 ...

Page 3

V = 50mV A (IN) RMS f = 20Hz TO 100kHz (IN (OUT) OFF ISOLATION = 20 LOG V OFF Isolation Test Circuit HIGH LOGIC t 100ns 1.4V r LOW INPUT t 100ns f DC ...

Page 4

SSM2404 Figure 5. Frequency Response ( rms 100 8. 1.00 V/DIV MKR: 0. 0Hz MKR: 20 000Hz BW: 150Hz Figure 6. SSM2404 Spectral Noise ...

Page 5

R = 100k L –75 –90 –105 –120 –135 –150 10 100 1k FREQUENCY – Hz Figure 11. Channel-to-Channel Crosstalk vs. Frequency (Worst Case Conditions, as Measured Between Switches 1 and and ...

Page 6

SSM2404 10V 100 5ms/div Figure 17 Switching Response ON OFF 100 90 OPEN 10 (SWITCH OFF) 0% 50mV Figure 18. Switch OFF-to-ON Transition (R 100 90 CLOSED (SWITCH ON ...

Page 7

DETAILED SWITCH OPERATION A simplified circuit schematic with the functional sections is shown in Figure 21. The TTL interface has an internally regulated ensure TTL logic levels regardless of the supply voltage. The logic threshold is with ...

Page 8

SSM2404 The circuit was tested with an SSM2131 high slew rate audio amplifier and the results are shown in Figures 24 and 25. This configuration yields excellent THD performance that is primarily determined by the amplifier. Also, the headroom is ...

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