a
16-/32-Channel, Serially Controlled 4
1.8 V to 5.5 V, 2.5 V, Analog Multiplexers
ADG725/ADG731
FUNCTIONAL BLOCK DIAGRAM
ADG731
S1
S1A
DA
S16A
D
S1B
DB
S32
INPUT SHIFT
REGISTER
S16B
INPUT SHIFT
REGISTER
FEATURES
3-Wire SPI Compatible Serial Interface
1.8 V to 5.5 V Single Supply
2.5 V Dual-Supply Operation
4 On Resistance
0.5 On Resistance Flatness
7 mm x 7 mm 48-Lead Chip Scale Package (LFCSP)
or 48-Lead TQFP Package
Rail-to-Rail Operation
Power-On Reset
42 ns Switching Times
Single 32-to-1 Channel Multiplexer
Dual/Differential 16-to-1 Channel Multiplexer
TTL/CMOS Compatible Inputs
For Functionally Equivalent Devices with Parallel
Interface, See ADG726/ADG732
APPLICATIONS
Optical Applications
Data Acquisition Systems
Communication Systems
Relay Replacement
Audio and Video Switching
Battery-Powered Systems
Medical Instrumentation
Automatic Test Equipment
ADG725
SCLK DIN
SYNC
SCLK DIN
SYNC
GENERAL DESCRIPTION
The ADG731/ADG725 are monolithic, CMOS, 32-channel/
dual 16-channel analog multiplexers with a serially controlled
3-wire interface. The ADG731 switches one of 32 inputs
(S1–S32) to a common output, D. The ADG725 can be config-
ured as a dual mux switching one of 16 inputs to one output, or a
differential mux switching one of 16 inputs to a differential output.
These mulitplexers utilize a 3-wire serial interface that is com-
patible with SPI
®
, QSPI
™
, MICROWIRE
™
, and some DSP
interface standards. On power-up, the Internal Shift Register
contains all zeros and all switches are in the OFF state.
These multiplexers are designed on an enhanced submicron
process that provides low power dissipation yet gives high switch-
ing speed with very low on resistance and leakage currents.
They operate from a single supply of 1.8 V to 5.5 V or a
±
2.5 V dual supply, making them ideally suited to a variety of
applications. On resistance is in the region of a few ohms, is
closely matched between switches, and is very flat over the full
signal range.
These parts can operate equally well as either multiplexers or
demultiplexers and have an input signal range that extends to the
supplies. In the OFF condition, signal levels up to the supplies
are blocked. All channels exhibit break-before-make switching
action, preventing momentary shorting when switching channels.
The ADG731 and ADG725 are serially controlled 32-channel,
and dual/differential 16-channel multiplexers, respectively. They
are available in either a 48-lead LFCSP or TQFP package.
PRODUCT HIGHLIGHTS
1.
2.
3-Wire Serial Interface.
1.8 V to 5.5 V Single-Supply or
±
2.5 V Dual-Supply
Operation. These parts are specified and guaranteed
with 5 V
±
10%, 3 V
±
10% single-supply,
and
±
2.5 V
±
10% dual-supply rails.
On Resistance of 4
W.
Guaranteed Break-Before-Make Switching Action.
7 mm
¥
7 mm 48-Lead Chip Scale Package (LFCSP) or
48-Lead TQFP Package.
3.
4.
5.
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. Trademarks and
registered trademarks are the property of their respective companies.
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
© 2003 Analog Devices, Inc. All rights reserved.
ADG725/ADG731–SPECIFICATIONS
1
(V
Parameter
ANALOG SWITCH
Analog Signal Range
On Resistance (R
ON
)
On Resistance Match between
Channels (∆R
ON
)
On Resistance Flatness (R
FLAT(ON)
)
LEAKAGE CURRENTS
Source OFF Leakage I
S
(OFF)
Drain OFF Leakage I
D
(OFF)
ADG725
ADG731
Channel ON Leakage I
D
, I
S
(ON)
ADG725
ADG731
DIGITAL INPUTS
Input High Voltage, V
INH
Input Low Voltage, V
INL
Input Current
I
INL
or I
INH
C
IN
, Digital Input Capacitance
DYNAMIC CHARACTERISTICS
2
t
TRANSITION
Break-Before-Make Time Delay, t
D
Charge Injection
Off Isolation
Channel-to-Channel Crosstalk
–3 dB Bandwidth
ADG725
ADG731
C
S
(OFF)
C
D
(OFF)
ADG725
ADG731
C
D
, C
S
(ON)
ADG725
ADG731
POWER REQUIREMENTS
I
DD
B Version
+25 C
–40 C to +85 C
0 to V
DD
4
5.5
6
0.3
0.8
1
±
0.01
±
0.25
±
0.05
±
0.5
±
1
±
0.05
±
0.5
±
1
DD
= 5 V
±
10%, V
SS
= 0 V, GND = 0 V, unless otherwise noted.)
Unit
V
Ω
typ
Ω
max
Ω
typ
Ω
max
Ω
typ
Ω
max
nA typ
nA max
nA typ
nA max
nA max
nA typ
nA max
nA max
V min
V max
µA
typ
µA
max
pF typ
ns typ
ns max
ns typ
ns min
pC typ
dB typ
dB typ
Test Conditions/Comments
V
S
= 0 V to V
DD
, I
DS
= 10 mA;
Test Circuit 1
V
S
= 0 V to V
DD
, I
DS
= 10 mA
V
S
= 0 V to V
DD
, I
DS
= 10 mA
V
DD
= 5.5 V
V
D
= 4.5 V/1 V, V
S
= 1 V/4.5 V;
Test Circuit 2
V
D
= 4.5 V/1 V, V
S
= 1 V/4.5 V;
Test Circuit 3
V
D
= V
S
= 1 V or 4.5 V;
Test Circuit 4
0.5
±
1
±
2.5
±
5
±
2.5
±
5
2.4
0.8
0.005
±
0.5
5
42
53
30
5
–72
–72
V
IN
= V
INL
or V
INH
62
1
R
L
= 300
Ω,
C
L
= 35 pF; Test Circuit 5
V
S1
= 3 V/0 V, V
S32
= 0 V/3 V
R
L
= 300
Ω,
C
L
= 35 pF
V
S
= 3 V; Test Circuit 6
V
S
= 2.5 V, R
S
= 0
Ω,
C
L
= 1 nF;
Test Circuit 7
R
L
= 50
Ω,
C
L
= 5 pF, f = 1 MHz;
Test Circuit 8
R
L
= 50
Ω,
C
L
= 5 pF, f = 1 MHz;
Test Circuit 9
R
L
= 50
Ω,
C
L
= 5 pF; Test Circuit 10
f = 1 MHz
f = 1 MHz
f = 1 MHz
f = 1 MHz
f = 1 MHz
V
DD
= 5.5 V
Digital Inputs = 0 V or 5.5 V
34
18
15
170
340
175
350
10
20
MHz typ
MHz typ
pF typ
pF typ
pF typ
pF typ
pF typ
µA
typ
µA
max
NOTES
1
Temperature range is as follows: B Version: –40°C to +85°C.
2
Guaranteed by design, not subject to production test.
Specifications subject to change without notice.
–2–
REV. A
ADG725/ADG731
SPECIFICATIONS
1
(V
Parameter
ANALOG SWITCH
Analog Signal Range
On Resistance (R
ON
)
DD
=3V
10%, V
SS
= 0 V, GND = 0 V, unless otherwise noted.)
B Version
+25 C
–40 C to +85 C
0 to V
DD
7
11
12
0.35
1
3
Unit
V
Ω
typ
Ω
max
Ω
typ
Ω
max
Ω
max
nA typ
nA max
nA typ
nA max
nA max
nA typ
nA max
nA max
V min
V max
µA
typ
µA
max
pF typ
ns typ
ns max
ns typ
ns min
pC typ
dB typ
dB typ
V
IN
= V
INL
or V
INH
Test Conditions/Comments
On Resistance Match between
Channels (∆R
ON
)
On Resistance Flatness (R
FLAT(ON)
)
LEAKAGE CURRENTS
Source OFF Leakage I
S
(OFF)
Drain OFF Leakage I
D
(OFF)
ADG725
ADG731
Channel ON Leakage I
D
, I
S
(ON)
ADG725
ADG731
DIGITAL INPUTS
Input High Voltage, V
INH
Input Low Voltage, V
INL
Input Current
I
INL
or I
INH
C
IN
, Digital Input Capacitance
DYNAMIC CHARACTERISTICS
2
t
TRANSITION
Break-Before-Make Time Delay, t
D
Charge Injection
Off Isolation
Channel-to-Channel Crosstalk
–3 dB Bandwidth
ADG725
ADG731
C
S
(OFF)
C
D
(OFF)
ADG725
ADG731
C
D
, C
S
(ON)
ADG725
ADG731
POWER REQUIREMENTS
I
DD
±
0.01
±
0.25
±
0.05
±
0.5
±
1
±
0.05
±
0.5
±
1
V
S
= 0 V to V
DD
, I
DS
= 10 mA;
Test Circuit 1
V
S
= 0 V to V
DD
, I
DS
= 10 mA
V
S
= 0 V to V
DD
, I
DS
= 10 mA
V
DD
= 3.3 V
V
S
= 3 V/1 V, V
D
= 1 V/3 V;
Test Circuit 2
V
S
= 1 V/3 V, V
D
= 3 V/1 V;
Test Circuit 3
V
S
= V
D
= 1 V or 3 V;
Test Circuit 4
±
1
±
2.5
±
5
±
2.5
±
5
2.0
0.7
0.005
±
0.5
5
60
80
30
1
–72
–72
90
1
R
L
= 300
Ω,
C
L
= 35 pF; Test Circuit 5
V
S1
= 2 V/0 V, V
S32
= 0 V/2 V
R
L
= 300
Ω,
C
L
= 35 pF
V
S
= 2 V; Test Circuit 6
V
S
= 0 V, R
S
= 0
Ω,
C
L
= 1 nF;
Test Circuit 7
R
L
= 50
Ω,
C
L
= 5 pF, f = 1 MHz;
Test Circuit 8
R
L
= 50
Ω,
C
L
= 5 pF, f = 1 MHz;
Test Circuit 9
R
L
= 50
Ω,
C
L
= 5 pF; Test Circuit 10
f = 1 MHz
f = 1 MHz
f = 1 MHz
f = 1 MHz
f = 1 MHz
V
DD
= 3.3 V
Digital Inputs = 0 V or 3.3 V
34
18
15
170
340
175
350
5
10
MHz typ
MHz typ
pF typ
pF typ
pF typ
pF typ
pF typ
µA
typ
µA
max
NOTES
1
Temperature range is as follows: B Version: –40°C to +85°C.
2
Guaranteed by design, not subject to production test.
Specifications subject to change without notice.
REV. A
–3–
ADG725/ADG731
DUAL-SUPPLY SPECIFICATIONS
Parameter
ANALOG SWITCH
Analog Signal Range
On Resistance (R
ON
)
On Resistance Match Between
Channels (∆R
ON
)
On Resistance Flatness (R
FLAT(ON)
)
LEAKAGE CURRENTS
Source OFF Leakage I
S
(OFF)
Drain OFF Leakage I
D
(OFF)
ADG725
ADG731
Channel ON Leakage I
D
, I
S
(ON)
ADG725
ADG731
DIGITAL INPUTS
Input High Voltage, V
INH
Input Low Voltage, V
INL
Input Current
I
INL
or I
INH
C
IN
, Digital Input Capacitance
DYNAMIC CHARACTERISTICS
2
t
TRANSITION
Break-Before-Make Time Delay, t
D
Charge Injection
Off Isolation
Channel-to-Channel Crosstalk
–3 dB Bandwidth
ADG725
ADG731
C
S
(OFF)
C
D
(OFF)
ADG725
ADG731
C
D
, C
S
(ON)
ADG725
ADG731
POWER REQUIREMENTS
I
DD
I
SS
1
(V
DD
= +2.5 V
10%, V
SS
= –2.5 V
unless otherwise noted.)
10%, GND = 0 V,
B Version
+25 C
–40 C to +85 C
V
SS
to V
DD
4
5.5
6
0.3
0.8
1
±
0.01
±
0.25
±
0.05
±
0.5
±
1
±
0.01
±
0.5
±
1
Unit
V
Ω
typ
Ω
max
Ω
typ
Ω
max
Ω
typ
Ω
max
nA typ
nA max
nA typ
nA max
nA max
nA typ
nA max
nA max
V min
V max
µA
typ
µA
max
pF typ
ns typ
ns max
ns typ
ns min
pC typ
dB typ
dB typ
Test Conditions/Comments
V
S
= V
SS
to V
DD
, I
DS
= 10 mA;
Test Circuit 1
V
S
= V
SS
to V
DD
, I
DS
= 10 mA
V
S
= V
SS
to V
DD
, I
DS
= 10 mA
V
DD
= +2.75 V, V
SS
= –2.75 V
V
S
= +2.25 V/–1.25 V, V
D
= –1.25 V/+2.25 V;
Test Circuit 2
V
S
= +2.25 V/–1.25 V, V
D
= –1.25 V/+2.25 V;
Test Circuit 3
V
S
= V
D
= +2.25 V/–1.25 V; Test Circuit 4
0.5
±
0.5
±
2.5
±
5
±
2.5
±
5
1.7
0.7
0.005
±
0.5
5
55
75
15
1
–72
–72
V
IN
= V
INL
or V
INH
84
1
R
L
= 300
Ω,
C
L
= 35 pF; Test Circuit 5
V
S1
= 1.5 V/0 V, V
S32
= 0 V/1.5 V
R
L
= 300
Ω,
C
L
= 35 pF
V
S
= 1.5 V; Test Circuit 6
V
S
= 0 V, R
S
= 0
Ω,
C
L
= 1 nF; Test Circuit 7
R
L
= 50
Ω,
C
L
= 5 pF, f = 1 MHz;
Test Circuit 8
R
L
= 50
Ω,
C
L
= 5 pF, f = 1 MHz;
Test Circuit 9
R
L
= 50
Ω,
C
L
= 5 pF; Test Circuit 10
34
18
13
130
260
150
300
10
20
10
20
MHz typ
MHz typ
pF typ
pF typ
pF typ
pF typ
pF typ
µA
typ
µA
max
µA
typ
µA
max
f = 1 MHz
f = 1 MHz
f = 1 MHz
f = 1 MHz
V
DD
= +2.75 V
Digital Inputs = 0 V or 2.75 V
V
SS
= –2.75 V
Digital Inputs = 0 V or 2.75 V
NOTES
1
Temperature range is as follows: B Version: –40°C to +85°C.
2
Guaranteed by design, not subject to production test.
Specifications subject to change without notice.
–4–
REV. A
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