ADG729 Analog Devices, ADG729 Datasheet

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ADG729

Manufacturer Part Number
ADG729
Description
CMOS, Low Voltage, 2 Wire, Serially Controlled Dual 4 to 1 Matrix Switch
Manufacturer
Analog Devices
Datasheet

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a
I
GENERAL DESCRIPTION
The ADG728 and ADG729 are CMOS analog matrix switches
with a serially controlled 2-wire interface. The ADG728 is an
8-channel matrix switch, while the ADG729 is a dual 4-channel
matrix switch. On resistance is closely matched between switches
and very flat over the full signal range. These parts can operate
equally well as either multiplexers, demultiplexers or switch
arrays and the input signal range extends to the supplies.
The ADG728 and ADG729 utilize a 2-wire serial interface that
is compatible with the I
external address pins (A0 and A1). This allows the 2 LSBs of
the 7-bit slave address to be set by the user. Four of each of the
devices can be connected to the one bus. The ADG728 also has
a RESET pin that should be tied high if not in use.
Each channel is controlled by one bit of an 8-bit word. This
means that these devices may be used in a number of different
configurations; all, any, or none of the channels may be on at
any one time.
On power-up of the device, all switches will be in the OFF con-
dition and the internal shift register will contain all zeros.
All channels exhibit break-before-make switching action pre-
venting momentary shorting when switching channels.
The ADG728 and ADG729 are available in 16-lead TSSOP
packages.
2
C is a trademark of Philips Corporation.
2
C™ interface standard. Both have two
Serially-Controlled, Matrix Switches
PRODUCT HIGHLIGHTS
1. 2-Wire Serial Interface.
2. Single Supply Operation. The ADG728 and ADG729 are
3. Low On Resistance 2.5 Ω typical.
4. Any configuration of switches may be on at any one time.
5. Guaranteed Break-Before-Make Switching Action.
6. Small 16-Lead TSSOP Package.
fully specified and guaranteed with 3 V and 5 V supply rails.
S1
S8
CMOS, Low-Voltage, 2-Wire
SDA
INPUT SHIFT
REGISTER
FUNCTIONAL BLOCK DIAGRAMS
ADG728
SCL
A0
A1
ADG728/ADG729
RESET
D
S1A
S4A
S1B
S4B
INPUT SHIFT
SDA SCL A0
REGISTER
ADG729
A1
DA
DB

Related parts for ADG729

ADG729 Summary of contents

Page 1

... These parts can operate equally well as either multiplexers, demultiplexers or switch arrays and the input signal range extends to the supplies. The ADG728 and ADG729 utilize a 2-wire serial interface that 2 is compatible with the I C™ interface standard. Both have two external address pins (A0 and A1) ...

Page 2

... C (OFF (OFF) D ADG728 ADG729 (ON ADG728 ADG729 POWER REQUIREMENTS OTES 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%, GND = 0 V, unless otherwise noted.) ...

Page 3

... MHz typ 100 MHz typ 13 pF typ 85 pF typ 42 pF typ 96 pF typ 48 pF typ µA typ 10 µA max 20 ADG728/ADG729 Test Conditions/Comments mA Test Circuit ...

Page 4

... ADG728/ADG729 TIMING CHARACTERISTICS Parameter Limit MIN MAX f 400 SCL 100 300 0. 250 11 300 3 0. 400 NOTES 1 See Figure master device must provide a hold time of at least 300 ns for the SDA signal (referred to the V the falling edge of SCL ...

Page 5

... TOP VIEW S2A (Not to Scale) S3A S4A ORDERING GUIDE Package Description Thin Shrink Small Outline Package (TSSOP) Thin Shrink Small Outline Package (TSSOP) ADG728/ADG729 GND S1B S2B 12 11 S3B 10 S4B 9 DB Package Option RU-16 RU-16 ...

Page 6

... Whichever Occurs First Peak Current 100 mA (Pulsed at 1 ms, 10% Duty Cycle max) Continuous Current, Each Continuous Current D, ADG729 . . . . . . . . . . . . . . . . . 80 mA Continuous Current D, ADG728 . . . . . . . . . . . . . . . . 120 mA Operating Temperature Range Industrial (B Version –40°C to +85°C Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 150° ...

Page 7

... Typical Performance Characteristics–ADG728/ADG729 – DRAIN OR SOURCE VOLTAGE – 0. 0. 0.04 I (ON) D 0.00 I (OFF) –0.04 S –0.08 I (OFF) D –0. – ...

Page 8

... OFF –40 – TEMPERATURE – ADG728 A –5 ADG729 –10 –15 –20 30k 100k 1M 10M 100M FREQUENCY – –20 –40 –60 –80 –100 –120 30k 100k 1M 10M 100M FREQUENCY – ...

Page 9

... The ADG728/ADG729 have different 7-bit slave addresses. The five MSBs of the ADG728 are 10011, while the MSBs of the ADG729 are 10001 and the two LSBs are determined by the state of the A0 and A1 pins. The 2-wire serial bus protocol operates as follows: 1 ...

Page 10

... MASTER READ OPERATION When reading data back from the ADG728/ADG729, the user must begin with an address byte and R/W bit, after which the ma- trix switch will acknowledge that it is prepared to transmit data by pulling SDA low. The readback operation is a single byte that consists of the eight data bits in the input register ...

Page 11

... Each has a different slave address since the state of their A0 and A1 pins is different. This allows each Matrix Switch to be writ- ten to or read from independently. Because the ADG729 has a different address to the ADG728, it would be possible for four of each of these devices to be connected to the same bus. ...

Page 12

... INPUT LOGIC SDA * SIMILAR CONNECTION FOR ADG729 ADG728 GND * SIMILAR CONNECTION FOR ADG729 CHANNEL-TO-CHANNEL CROSSTALK = 20LOG SEATING SWITCH OFF V OUT C L 1nF GND SCL V OUT *SIMILAR CONNECTION FOR ADG729 S1 IS SWITCHED OFF FOR OFF ISOLATION MEASURE- ...

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