SSM-2404 Analog Devices, SSM-2404 Datasheet

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SSM-2404

Manufacturer Part Number
SSM-2404
Description
Quad Audio Switch
Manufacturer
Analog Devices
Datasheet
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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SSM-2404 Summary of contents

Page 1

... TTL and CMOS Compatible Logic Inputs Low Cost-Per-Switch 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 kHz. With very low charge injection of 35 pC, “ ...

Page 2

... 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

... Figure 3. THD+N vs. Load (V ON OFF kHz, with 80 kHz Filter) 0.01 0.001 0.0001 Figure 4. THD+N vs. Supply Voltage ( kHz, R –3– SSM2404 = kHz, with S 1k 10k LOAD RESISTANCE – rms SUPPLY VOLTAGE – rms, ...

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 Density e [5 Devices (20 Switches) Chained Together] 10V 100 10V Figure 7. Square Wave Response ( 100 kHz) ...

Page 5

... Figure 15. Switching Time vs. Temperature 1.0 0.8 0.6 0.4 0 0.8V IL –0.2 –0 2.4V IH –0.6 –0.8 –1 Figure 16. Supply Current vs. Temperature –5– SSM2404 V = 12V 0.8V INL – +85 C –10 – ANALOG INPUT VOLTAGE – Volts V = 12V OFF – ...

Page 6

... OUTPUT such multiple-package applications (OUT) As Figure 20 shows, the SSM2404 is easy to use, and no ad- ditional devices are needed. The load resistors are recommended for improved OFF-isolation and charge injection. The ON LOGIC resistance of the switch is only 28 INPUT little signal attenuation even with a load resistor ...

Page 7

... SWA/SWB Figure 22. Double-Pole, Double-Throw Stereo Switch VIRTUAL GROUND SWITCHING The SSM2404 was built on a CMOS process with operating limit for the total supply voltage across the part. This leads to a corresponding limit on the analog voltage range. How- ever, to achieve larger signal swings, the SSM2404 should be configured in the virtual ground mode ...

Page 8

... Also, the headroom is now +24 dBu (0 dBu = 0.775 V rms), which is due to the amplifier’s output voltage swing. Thus, even though the SSM2404 has limitation on its supplies, it can be used in systems with much higher voltage ranges. For example, the double-pole double-throw switch from Figure 22 can be reconfigured in the virtual ground mode to allow higher voltage swings, as shown in Figure 26 ...

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