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What is ADG781?

This electronic component, produced by the manufacturer "Analog Devices", performs the same function as "2.5 ohm Quad SPST Switches in Chip Scale Package".


ADG781 Datasheet PDF - Analog Devices

Part Number ADG781
Description 2.5 ohm Quad SPST Switches in Chip Scale Package
Manufacturers Analog Devices 
Logo Analog Devices Logo 


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a
FEATURES
1.8 V to 5.5 V Single Supply
Low On Resistance (2.5 Typ)
Low On-Resistance Flatness (0.5 )
–3 dB Bandwidth > 200 MHz
Rail-to-Rail Operation
20-Lead 4 mm ؋ 4 mm Chip Scale Package
Fast Switching Times
tON = 16 ns
tOFF = 10 ns
Typical Power Consumption (< 0.01 W)
TTL/CMOS Compatible
For Functionally Equivalent Devices in 16-Lead TSSOP
and SOIC Packages, See ADG711/ADG712/ADG713
APPLICATIONS
Battery Powered Systems
Communication Systems
Sample Hold Systems
Audio Signal Routing
Video Switching
Mechanical Reed Relay Replacement
2.5 Quad SPST Switches
in Chip Scale Package
ADG781/ADG782/ADG783
FUNCTIONAL BLOCK DIAGRAMS
S1
IN1
D1
S2
IN2
D2
ADG781
S3
IN3
D3
S4
IN4
D4
S1 S1
IN1 IN1
D1 D1
S2 S2
IN2 IN2
D2
ADG782
S3
D2
ADG783
S3
IN3 IN3
D3 D3
S4 S4
IN4 IN4
D4 D4
SWITCHES SHOWN FOR A LOGIC “1” INPUT
GENERAL DESCRIPTION
The ADG781, ADG782, and ADG783 are monolithic CMOS
devices containing four independently selectable switches. These
switches are designed on an advanced submicron process that
provides low power dissipation and high switching speed, low on
resistance, low leakage currents and high bandwidth.
They are designed to operate from a single 1.8 V to 5.5 V sup-
ply, making them ideal for use in battery powered instruments
and with the new generation of DACs and ADCs from Analog
Devices. Fast switching times and high bandwidth make the
part suitable for video signal switching.
The ADG781, ADG782, and ADG783 contain four independent
single-pole/single throw (SPST) switches. The ADG781 and
ADG782 differ only in that the digital control logic is inverted.
The ADG781 switches are turned on with a logic low on the
appropriate control input, while a logic high is required to turn
on the switches of the ADG782. The ADG783 contains two
switches whose digital control logic is similar to the ADG781,
while the logic is inverted on the other two switches.
Each switch conducts equally well in both directions when ON.
The ADG783 exhibits break-before-make switching action.
The ADG781/ADG782/ADG783 are available in 20-lead chip
scale packages.
PRODUCT HIGHLIGHTS
1. 20-Lead 4 mm ϫ 4 mm Chip Scale Package (CSP).
2. 1.8 V to 5.5 V Single Supply Operation. The ADG781,
ADG782, and ADG783 offer high performance and are
fully specified and guaranteed with 3 V and 5 V supply
rails.
3. Very Low RON (4.5 max at 5 V, 8 max at 3 V). At supply
voltage of 1.8 V, RON is typically 35 over the temperature
range.
4. Low On-Resistance Flatness.
5. –3 dB Bandwidth >200 MHz.
6. Low Power Dissipation. CMOS construction ensures low
power dissipation.
7. Fast tON/tOFF.
8. Break-Before-Make Switching. This prevents channel shorting
when the switches are configured as a multiplexer (ADG783
only).
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 that
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: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2002

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ADG781 equivalent
VDD
GND
S
D
IN
RON
RON
RFLAT(ON)
IS (OFF)
ID (OFF)
ID, IS (ON)
VD (VS)
CS (OFF)
CD (OFF)
ADG781/ADG782/ADG783
TERMINOLOGY
Most positive power supply potential.
Ground (0 V) reference.
Source terminal. May be an input or output.
Drain terminal. May be an input or output.
Logic control input.
Ohmic resistance between D and S.
On-resistance match between any two chan-
nels (i.e., RON max and RON min).
Flatness is defined as the difference between
the maximum and minimum value of on
resistance as measured over the specified
analog signal range.
Source leakage current with the switch “OFF.”
Drain leakage current with the switch “OFF.”
Channel leakage current with the switch “ON.”
Analog voltage on terminals D, S.
“OFF” switch source capacitance.
“OFF” switch drain capacitance.
CD, CS (ON)
tON
tOFF
tD
Crosstalk
Off Isolation
Charge
Injection
On Response
On Loss
“ON” switch capacitance.
Delay between applying the digital control
input and the output switching on.
Delay between applying the digital control
input and the output switching off.
“OFF” time or “ON” time measured
between the 90% points of both switches,
when switching from one address state to
another (ADG783 only).
A measure of unwanted signal that is coupled
through from one channel to another as a
result of parasitic capacitance.
A measure of unwanted signal coupling
through an “OFF” switch.
A measure of the glitch impulse transferred
from the digital input to the analog output
during switching.
The frequency response of the “ON” switch.
The loss due to the on resistance of the switch.
Typical Performance Characteristics
6
5.5
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
0
VDD = 2.7V
TA = 25؇C
VDD = 3V
VDD = 4.5V
VDD = 5V
0.5 1 1.5 2 2.5 3 3.5 4 4.5
VD OR VS DRAIN OR SOURCE VOLTAGE V
5
TPC 1. On Resistance as a Function of VD (VS)
6
5.5
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
0
+85؇C
40؇ C
VDD = 3V
+25؇C
0.5 1 1.5 2 2.5
VD OR VS DRAIN OR SOURCE VOLTAGE V
3
TPC 2. On Resistance as a Function of VD (VS) for
Different Temperatures VDD = 3 V
REV. A
6
5.5
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
0
+85؇C
+25؇C
VDD = 5V
40؇ C
0.5 1 1.5 2 2.5 3 3.5 4 4.5
VD OR VS DRAIN OR SOURCE VOLTAGE V
5
TPC 3. On Resistance as a Function of VD (VS) for
Different Temperatures VDD = 5 V
10m
VDD = 5V
1m
100
10
1
4 SW
1 SW
100n
10n
1n
100
1k
10k 100k 1M
10M
FREQUENCY Hz
TPC 4. Supply Current vs. Input Switching Frequency
–5–


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Featured Datasheets

Part NumberDescriptionMFRS
ADG781The function is 2.5 ohm Quad SPST Switches in Chip Scale Package. Analog DevicesAnalog Devices
ADG782The function is 2.5 ohm Quad SPST Switches in Chip Scale Package. Analog DevicesAnalog Devices
ADG783The function is 2.5 ohm Quad SPST Switches in Chip Scale Package. Analog DevicesAnalog Devices

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