AD ADG742BKS Cmos low voltage 2ohm spst switches in sc70 package Datasheet

a
CMOS Low Voltage
2 ⍀ SPST Switches in SC70 Packages
ADG741/ADG742
FEATURES
1.8 V to 5.5 V Single Supply
2 ⍀ (Typ) On Resistance
Low On-Resistance Flatness
–3 dB Bandwidth >200 MHz
Rail-to-Rail Operation
6-Lead SC70
Fast Switching Times
t ON 18 ns
t OFF 12 ns
Typical Power Consumption (<0.01 ␮W)
TTL/CMOS Compatible
FUNCTIONAL BLOCK DIAGRAMS
ADG741
S
D
IN
ADG742
S
APPLICATIONS
Battery Powered Systems
Communication Systems
Sample Hold Systems
Audio Signal Routing
Video Switching
Mechanical Reed Relay Replacement
D
IN
SWITCHES SHOWN FOR
A LOGIC "1" INPUT
GENERAL DESCRIPTION
PRODUCT HIGHLIGHTS
The ADG741/ADG742 are monolithic CMOS SPST switches.
These switches are designed on an advanced submicron process
that provides low power dissipation yet high switching speed,
low on resistance, low leakage currents and –3 dB bandwidths of
greater than 200 MHz can be achieved.
1. 1.8 V to 5.5 V Single Supply Operation. The ADG741/
ADG742 offer high performance, including low on resistance
and fast switching times and is fully specified and guaranteed
with 3 V and 5 V supply rails.
The ADG741/ADG742 can operate from a single 1.8 V to 5.5 V
supply, making it ideal for use in battery-powered instruments
and with Analog Devices’ new generation of DACs and ADCs.
As can be seen from the Functional Block Diagrams, with a
logic input of “1” the switch of the ADG741 is closed, while
that of the ADG742 is open. Each switch conducts equally well
in both directions when ON.
The ADG741/ADG742 are available in 6-lead SC70 package.
2. Very Low RON (3 Ω max at 5 V, 5 Ω max at 3 V). At 1.8 V
operation, RON is typically 40 Ω over the temperature range.
3. On-Resistance Flatness RFLAT(ON) (1 Ω max).
4. –3 dB Bandwidth >200 MHz.
5. Low Power Dissipation. CMOS construction ensures low
power dissipation.
6. Fast tON/tOFF.
7. Tiny 6-Lead SC70 package.
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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: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000
(VDD = 5 V ⴞ 10%, GND = 0 V. All specifications –40ⴗC to +85ⴗC
ADG741/ADG742–SPECIFICATIONS1 unless otherwise noted.)
Parameter
25ⴗC
ANALOG SWITCH
Analog Signal Range
On Resistance (RON)
B Version
–40ⴗC to +85ⴗC
0 V to VDD
On-Resistance Flatness (RFLAT(ON))
2
3
0.5
4
1.0
Unit
Test Conditions/Comments
V
Ω typ
Ω max
Ω typ
Ω max
VS = 0 V to VDD, IS = –10 mA;
Test Circuit 1
VS = 0 V to VDD, IS = –10 mA
2
LEAKAGE CURRENTS
Source OFF Leakage IS (OFF)
Drain OFF Leakage ID (OFF)
Channel ON Leakage ID, IS (ON)
± 0.01
± 0.25
± 0.01
± 0.25
± 0.01
± 0.25
DIGITAL INPUTS
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current
IINL or IINH
0.005
DYNAMIC CHARACTERISTICS2
tON
12
± 0.35
2.4
0.8
V min
V max
± 0.1
µA typ
µA max
VIN = VINL or VINH
RL = 300 Ω, CL = 35 pF
VS = 3 V; Test Circuit 4
RL = 300 Ω, CL = 35 pF
VS = 3 V; Test Circuit 4
VS = 2 V, RS = 0 Ω, CL = 1 nF;
Test Circuit 5
RL = 50 Ω, CL = 5 pF, f = 10 MHz
RL = 50 Ω, CL = 5 pF, f = 1 MHz;
Test Circuit 6
RL = 50 Ω, CL = 5 pF;
Test Circuit 7
± 0.35
± 0.35
tOFF
8
Charge Injection
5
ns typ
ns max
ns typ
ns max
pC typ
Off Isolation
–55
–75
dB typ
dB typ
Bandwidth –3 dB
200
MHz typ
CS (OFF)
CD (OFF)
CD, CS (ON)
17
17
38
pF typ
pF typ
pF typ
18
12
VDD = 5.5 V
Digital Inputs = 0 V or 5 V
POWER REQUIREMENTS
IDD
VDD = 5.5 V
VS = 4.5 V/1 V, VD = 1 V/4.5 V;
Test Circuit 2
VS = 4.5 V/1 V, VD = 1 V/4.5 V;
Test Circuit 2
VS = VD = 1 V, or 4.5 V;
Test Circuit 3
nA typ
nA max
nA typ
nA max
nA typ
nA max
µA typ
µA max
0.001
1.0
NOTES
1
Temperature ranges are as follows: B Versions: – 40°C to +85°C.
2
Guaranteed by design, not subject to production test.
Specifications subject to change without notice.
–2–
REV. 0
ADG741/ADG742
SPECIFICATIONS1 (V
DD
Parameter
ANALOG SWITCH
Analog Signal Range
On Resistance (RON)
On-Resistance Flatness (RFLAT(ON))
LEAKAGE CURRENTS2
Source OFF Leakage IS (OFF)
Drain OFF Leakage ID (OFF)
Channel ON Leakage ID, IS (ON)
= 3 V ⴞ 10%, GND = 0 V. All specifications –40ⴗC to +85ⴗC unless otherwise noted.)
25ⴗC
B Version
–40ⴗC to +85ⴗC
Unit
Test Conditions/Comments
V
Ω typ
Ω max
Ω typ
VS = 0 V to VDD, IS = –10 mA;
Test Circuit 1
VS = 0 V to VDD, IS = –10 mA
± 0.35
nA typ
nA max
nA typ
nA max
nA typ
nA max
VDD = 3.3 V
VS = 3 V/1 V, VD = 1 V/3 V;
Test Circuit 2
VS = 3 V/1 V, VD = 1 V/3 V;
Test Circuit 2
VS = VD = 1 V, or 3 V;
Test Circuit 3
2.0
0.4
V min
V max
± 0.1
µA typ
µA max
VIN = VINL or VINH
RL = 300 Ω, CL = 35 pF
VS = 2 V, Test Circuit 4
RL = 300 Ω, CL = 35 pF
VS = 2 V, Test Circuit 4
VS = 1.5 V, RS = 0 Ω, CL = 1 nF;
Test Circuit 5
RL = 50 Ω, CL = 5 pF, f = 10 MHz
RL = 50 Ω, CL = 5 pF, f = 1 MHz;
Test Circuit 6
RL = 50 Ω, CL = 5 pF;
Test Circuit 7
0 V to VDD
3.5
5
1.5
± 0.01
± 0.25
± 0.01
± 0.25
± 0.01
± 0.25
DIGITAL INPUTS
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current
IINL or IINH
0.005
DYNAMIC CHARACTERISTICS2
tON
14
6
± 0.35
± 0.35
tOFF
8
Charge Injection
4
ns typ
ns max
ns typ
ns max
pC typ
Off Isolation
–55
–75
dB typ
dB typ
Bandwidth –3 dB
200
MHz typ
CS (OFF)
CD (OFF)
CD, CS (ON)
17
17
38
pF typ
pF typ
pF typ
20
13
VDD = 3.3 V
Digital Inputs = 0 V or 3 V
POWER REQUIREMENTS
IDD
µA typ
µA max
0.001
1.0
NOTES
1
Temperature ranges are as follows: B Versions: –40°C to +85°C.
2
Guaranteed by design, not subject to production test.
Specifications subject to change without notice.
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–3–
ADG741/ADG742
ABSOLUTE MAXIMUM RATINGS 1
(TA = 25°C unless otherwise noted)
VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
Analog, Digital Inputs2 . . . . . . . . . . . . . . –0.3 V to VDD +0.3 V
or 30 mA, Whichever Occurs First
Continuous Current, S or D . . . . . . . . . . . . . . . . . . . . . 30 mA
Peak Current, S or D . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mA
(Pulsed at 1 ms, 10% Duty Cycle Max)
Operating Temperature Range
Industrial (B Version) . . . . . . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . .150°C
SC70 Package
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 332°C/W
θJC Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 120°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . .215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220°C
ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 kV
NOTES
1
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational sections
of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Only one absolute maximum rating may be applied at any one time.
2
Overvoltages at IN, S or D will be clamped by internal diodes. Current should be
limited to the maximum ratings given.
Table I. Truth Table
ADG741 In
ADG742 In
Switch Condition
0
1
1
0
OFF
ON
ORDERING GUIDE
Model
Temperature Range
Brand*
Package Description
Package Option
ADG741BKS
ADG742BKS
–40°C to +85°C
–40°C to +85°C
SFB
SGB
SC70
SC70
KS-6
KS-6
*Brand = Brand on these packages is limited to three characters due to space constraints.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the ADG741/ADG742 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
–4–
WARNING!
ESD SENSITIVE DEVICE
REV. 0
ADG741/ADG742
PIN CONFIGURATIONS
TERMINOLOGY
VDD
GND
S
D
IN
RON
RFLAT(ON)
6-Lead Plastic Surface Mount
(SC70)
D 1
S 2
ADG741/
ADG742
6 V
DD
5 NC
GND 3 TOP VIEW 4 IN
(Not to Scale)
NC = NO CONNECT
IS (OFF)
ID (OFF)
ID, IS (ON)
VD (VS)
CS (OFF)
CD (OFF)
CD, CS (ON)
tON
tOFF
Off Isolation
Charge
Injection
Bandwidth
On Response
On Loss
REV. 0
–5–
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.
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.
“ON” Switch Capacitance.
Delay between applying the digital control
input and the output switching on. See Test
Circuit 4.
Delay between applying the digital control
input and the output switching off.
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 at which the output is attenuated by –3 dBs.
The frequency response of the “ON” switch.
The voltage drop across the “ON” switch seen
on the On Response vs. Frequency plot as how
many dBs the signal is away from 0 dB at very
low frequencies.
ADG741/ADG742 –Typical Performance Characteristics
3.5
10m
VDD = 2.7V
TA = 25 C
VDD = 5V
3.0
1m
2.5
100␮
VDD = 4.5V
2.0
1.5
ISUPPLY – A
RON – ⍀
VDD = 3.0V
VDD = 5.0V
10␮
1␮
1.0
100n
0.5
10n
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
1n
10
5.0
100
1k
VD OR VS – DRAIN OR SOURCE VOLTAGE – V
TPC 1. On Resistance as a Function of VD (VS) Single
Supplies
1M
10M
TPC 4. Supply Current vs. Input Switching Frequency
3.5
–10
VDD = 3V
VDD = 5V, 3V
–20
3.0
–30
+85ⴗC
OFF ISOLATION – dB
2.5
+25ⴗC
RON – ⍀
100k
10k
FREQUENCY – Hz
2.0
–40ⴗC
1.5
1.0
–40
–50
–60
–70
–80
–90
0.5
–100
0
0
0.5
1.0
1.5
2.0
2.5
–110
10k
3.0
100k
VD OR VS – DRAIN OR SOURCE VOLTAGE – V
TPC 2. On Resistance as a Function of VD (VS) for
Different Temperatures VDD = 3 V
10M
1M
FREQUENCY – Hz
100M
TPC 5. Off Isolation vs. Frequency
3.5
0
VDD = 5V
VDD = 3V
3.0
ON RESPONSE – dB
2.5
RON – ⍀
+85ⴗC
2.0
+25ⴗC
1.5
–40ⴗC
1.0
–2
–4
0.5
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
–6
10k
5.0
VD OR VS – DRAIN OR SOURCE VOLTAGE – V
TPC 3. On Resistance as a Function of VD (VS) for
Different Temperatures VDD = 5 V
100k
1M
10M
FREQUENCY – Hz
100M
TPC 6. On Response vs. Frequency
–6–
REV. 0
ADG741/ADG742
Test Circuits
IDS
V1
IS (OFF)
S
VS
D
RON = V1/IDS
ID (OFF)
S
A
D
VS
Test Circuit 1. On Resistance
ID (ON)
S
A
D
A
VS
VD
Test Circuit 2. Off Leakage
VD
Test Circuit 3. On Leakage
VDD
0.1␮F
VIN ADG741
50%
50%
VIN
50%
50%
VDD
S
VS
VOUT
D
RL
300⍀
IN
CL
35pF
ADG742
90%
VOUT
90%
GND
tOFF
tON
Test Circuit 4. Switching Times
VDD
VDD
RS
S
VIN
ADG741
ON
VOUT
D
VS
CL
1nF
IN
VIN
OFF
ADG742
VOUT
GND
QINJ = CL ⴛ ⌬VOUT
⌬VOUT
Test Circuit 5. Charge Injection
VDD
0.1␮F
VDD
0.1␮F
VDD
S
D
S
RL
50⍀
IN
VS
VDD
VOUT
VIN
GND
Test Circuit 6. Off Isolation
VIN
GND
Test Circuit 7. Bandwidth
–7–
VOUT
RL
50⍀
IN
VS
REV. 0
D
The signal transfer characteristic is dependent on the switch
channel capacitance, CDS. This capacitance creates a frequency
zero in the numerator of the transfer function A(s). Because the
switch on resistance is small, this zero usually occurs at high
frequencies. The bandwidth is a function of the switch output
capacitance combined with CDS and the load capacitance. The
frequency pole corresponding to these capacitances appears in
the denominator of A(s).
APPLICATIONS INFORMATION
The ADG741/ADG742 belongs to Analog Devices’ new family of CMOS switches. This series of general-purpose switches
have improved switching times, lower on resistance, higher
bandwidth, low power consumption and low leakage currents.
ADG741/ADG742 Supply Voltages
Functionality of the ADG741/ADG742 extends from 1.8 V to
5.5 V single supply, which makes it ideal for battery-powered
instruments, where important design parameters are power
efficiency and performance.
The dominant effect of the output capacitance, CD, causes the
pole breakpoint frequency to occur first. Therefore, in order to
maximize bandwidth a switch must have a low input and output
capacitance and low on resistance. The On Response vs. Frequency plot for the ADG741/ADG742 can be seen in TPC 6.
It is important to note that the supply voltage effects the input
signal range, the on resistance, and the switching times of the
part. By looking at the typical performance characteristics
and the specifications, the effects of the power supplies can
be clearly seen.
Off Isolation
Off isolation is a measure of the input signal coupled through an
off switch to the switch output. The capacitance, CDS, couples
the input signal to the output load, when the switch is off, as
shown in Figure 2.
For VDD = 1.8 V operation, RON is typically 40 Ω over the temperature range.
On Response vs. Frequency
Figure 1 illustrates the parasitic components that affect the ac
performance of CMOS switches (the switch is shown surrounded
by a box). Additional external capacitances will further degrade
some performance. These capacitances affect feedthrough,
crosstalk and system bandwidth.
CDS
S
VIN
D
RON
VIN
CD
CLOAD
D
CD
CLOAD
VOUT
RLOAD
Figure 2. Off Isolation Is Affected by External Load Resistance and Capacitance
CDS
S
C02076–2.5–10/00 (rev.0)
ADG741/ADG742
VOUT
The larger the value of CDS, larger values of feedthrough will be
produced. The typical performance characteristic graph of TPC 5
illustrates the drop in off-isolation as a function of frequency. From
dc to roughly 1 MHz, the switch shows better than –75 dB isolation. Up to frequencies of 10 MHz, the off isolation remains better
than –55 dB. As the frequency increases, more and more of the
input signal is coupled through to the output. Off-isolation can be
maximized by choosing a switch with the smallest CDS as possible.
The values of load resistance and capacitance affect off isolation
also, as they contribute to the coefficients of the poles and zeros
in the transfer function of the switch when open.
RLOAD
Figure 1. Switch Represented by Equivalent Parasitic
Components
The transfer function that describes the equivalent diagram of
the switch (Figure 1) is of the form (A)s shown below.
 s(RON CDS ) + 1 
A(s) = RT 

 s(RON CT RT ) + 1 
 s(RLOAD CDS ) 
A(s) = 

s(RLOAD )(CT ) +1
where:
CT = CLOAD + CD + CDS
RT = RLOAD /(RLOAD + RON)
OUTLINE DIMENSIONS
PRINTED IN U.S.A.
Dimensions shown in inches and (mm).
6-Lead Plastic Surface Mount
(SC70)
0.087 (2.20)
0.071 (1.80)
0.053 (1.35)
0.045 (1.15)
6
1
5
4
2
3
0.094 (2.40)
0.071 (1.80)
PIN 1
0.026 (0.65) BSC
0.051 (1.30)
BSC
0.039 (1.00)
0.031 (0.80)
0.004 (0.10)
0.000 (0.00)
0.043 (1.10)
0.031 (0.80)
0.012 (0.30) SEATING
0.006 (0.15) PLANE
–8–
8ⴗ
0.007 (0.18) 0ⴗ
0.004 (0.10)
0.012 (0.30)
0.004 (0.10)
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