ADG731 AD [Analog Devices], ADG731 Datasheet

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ADG731

Manufacturer Part Number
ADG731
Description
Manufacturer
AD [Analog Devices]
Datasheet

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FEATURES
3-Wire SPI Serial Interface
1.8 V to 5.5 V Single Supply
±2.5 V Dual Supply Operation
4
0.5
7mm x 7mm 48 lead Chip Scale Package (CSP)
Rail to Rail Operation
Power On Reset
Fast 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
APPLICATIONS
Optical Applications
Data Acquisition Systems
Communication Systems
Relay replacement
Audio and Video Switching
Battery Powered Systems
Medical Instrumentation
Automatic Test Equipment
REV. PrD May 2002
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.
GENERAL DESCRIPTION
The ADG725/ADG731 are monolithic CMOS 32
channel/dual 16 channel analog multiplexers with a
serially controlled 3-wire interface. The ADG732 switches
one of thirty-two inputs (S1-S32) to a common output, D.
The ADG725 can be configured as a dual mux switching
one of sixteen inputs to one output or a differential mux
switching one of sixteen inputs to a differential output.
These mulitplexers utilize a 3-wire serial interface that is
compatible with SPI
some DSP interface standards. On power-up, the internal
shift register contains all zeros and all switch are in the
OFF state.
These multiplexers are designed on an enhanced submi-
cron process that provides low power dissipation yet gives
high switching speed, very low on resistance and leakage
currents. They operate from single supply of 1.8V to 5.5V
and ±2.5 V dual supply, making them ideally suited to a
variety of applications. On resistance is in the region of a
few Ohms and is closely matched between switches and
very flat over the full signal range. These parts can operate
equally well as either Multiplexers or De-Multiplexers
or 48 lead TQFP package.
See ADG726/ADG732
Preliminary Technical Data
On Resistance
On Resistance Flatness
TM
, QSPI
PRELIMINARY TECHNICAL DATA
TM
, MICROWIRE
1.8 V to 5.5 V, ±2.5 V, Analog Multiplexers
TM
16-/32- Channel, Serially Controlled 4
and
and have an input signal range which extends to the sup-
plies. 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.
They are available in either 48 lead CSP or TQFP
package.
PRODUCT HIGHLIGHTS
1. 3-Wire Serial Interface.
2. +1.8 V to +5.5 V Single or ±2.5 V Dual Supply
3. On Resistance of 4
4. Guaranteed Break-Before-Make Switching Action.
5. 7mm x 7mm 48 lead Chip Scale Package (CSP)
One Technology Way, P .O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
operation. These parts are specified and guaranteed
with +5 V ±10%, +3 V ±10% single supply and
±2.5 V ±10% dual supply rails.
or 48 lead TQFP package.
FUNCTIONAL BLOCK DIAGRAMS
ADG725/ADG731
.
Analog Devices, Inc., 2002
www.analog.com

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ADG731 Summary of contents

Page 1

... Battery Powered Systems Medical Instrumentation Automatic Test Equipment GENERAL DESCRIPTION The ADG725/ADG731 are monolithic CMOS 32 channel/dual 16 channel analog multiplexers with a serially controlled 3-wire interface. The ADG732 switches one of thirty-two inputs (S1-S32 common output, D. The ADG725 can be configured as a dual mux switching one of sixteen inputs to one output or a differential mux switching one of sixteen inputs to a differential output ...

Page 2

... ADG731 C (OFF (OFF) D ADG725 ADG731 (ON ADG725 ADG731 POWER REQUIREMENTS I DD 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 ± 10 Version –40°C ...

Page 3

... S C (OFF) D ADG725 ADG731 (ON ADG725 ADG731 POWER REQUIREMENTS I DD NOTES 1 Temperature ranges are 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. PrD = 3V ± 10 0V, GND = 0 V, unless otherwise noted) ...

Page 4

... ADG725 ADG731 C (OFF (OFF) D ADG725 ADG731 (ON ADG725 ADG731 POWER REQUIREMENTS 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. 1 Dual Supply B Version –40°C ...

Page 5

... Minimum ) and timed from a voltage level DB0 DB7 (MSB) DB0 (LSB Figure 3. ADG731 Input Shift Register Contents –5– ADG725/ADG731 to SCLK falling edge setup time low time high time + V )/ DB0 (LSB ...

Page 6

... 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 ADG725/ADG731 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 ...

Page 7

... S22 S5A 8 29 S21 S4A 9 28 S20 S3A 10 S19 27 11 S2A S18 26 12 S1A 25 S17 CONNECT –7– ADG725/ADG731 S12B PIN 1 IDENTIFIER 35 S11B 34 S10B 33 S9B 32 S8B ADG725 31 S7B TOP VIEW 30 S6B (Not to Scale) 29 S5B ...

Page 8

... Table 2. ADG731 Truth Table ...

Page 9

... Off Isolation A measure of unwanted signal coupling through an “OFF” switch. Crosstalk A measure of unwanted signal is coupled through from one channel to another as a result of parasitic capacitance. On Response The Frequency response of the “ON” switch. Insertion The loss due to the ON resistance of the switch. Loss REV. PrD TERMINOLOGY max - R min ON ON –9– ADG725/ADG731 ...

Page 10

... PRELIMINARY TECHNICAL DATA ADG725/ADG731 TYPICAL PERFORMANCE CHARACTERISTICS TPC 1. On Resistance vs for for D S Single Supply TPC 2. On Resistance vs for D S Dual Supply TPC 3. On Resistance vs for D S Different Temperatures, Single Supply TPC 4. On Resistance vs. V ...

Page 11

... TPC 10. Leakage Currents vs. Temperature TPC 11. Supply Currents vs. Input Switching Frequency TPC 12. Charge Injection vs. Source Voltage REV. PrD TPC 13 Times vs. ON OFF Temperature TPC 14. Off Isolation vs. Frequency TPC 15. Crosstalk vs. Frequency –11– ADG725/ADG731 TPC 16. On Response vs. Frequency ...

Page 12

... OFF condition and the internal shift register is filled with zeros and will remain so until a valid write takes place. SERIAL INTERFACE The ADG725 and ADG731 have a three wire serial inter- face ( , SCLK, and DIN), which is compatible with SPI, QSPI, MICROWIRE interface standards and most DSP’ ...

Page 13

... V S32 OUT OUT 35pF V S32 SYNC OUT OUT R L 35pF 300 Test Circuit 6. Break Before Make Delay, t –13– ADG725/ADG731 (OFF S32 V D GND Test Circuit 3. I (OFF ...

Page 14

... OUT L VOUT WITH SWITCH VOUT WITHOUT SWITCH –14– V OUT Q INJ = OUT NETWORK 50 ANALYZER S2 50 S32 ADG731 OUT R L GND 50 *SIMILAR CONNECTION FOR ADG725 CHANNEL TO CHANNEL CROSSTALK= 20LOG 10 (V OUT / REV. PrD ...

Page 15

... BSC 0.030 (0.75) 0.037 (0.95) 0.018 (0.45 SEATING PLANE TOP VIEW (PINS DOWN) 0.006 (0.15 0.002 (0.05) 0° MIN 0° – 7° 0.008 (0.20) 0.019 (0.5) 0.011 (0.27) 0.004 (0.09) BSC 0.006 (0.17) –15– ADG725/ADG731 0.010 (0.25) MIN 0.207 (5.25) BOTTOM 0.201 (5.10) SQ VIEW 0.195 (4.95 0.217 (5.5) REF ...

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