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ADG428

LC2MOS Latchable 4-/8-Channel High Performance Analog Multiplexers

Analog Devices 

TERMINOLOGY

VDD

Most positive power supply potential.

VSS

Most negative power supply potential in dual

supplies. In single supply applications, it may

be connected to ground.

GND

Ground (0 V) reference.

RON

∆RON

Ohmic resistance between D and S.

Difference between the RON of any two

channels.

IS (OFF)

ID (OFF)

ID, IS (ON)

Source leakage current when the switch is off.

Drain leakage current when the switch is off.

Channel leakage current when the switch is

on.

VD (VS)

CS (OFF)

Analog voltage on terminals D, S.

Channel input capacitance for “OFF”

condition.

CD (OFF)

Channel output capacitance for “OFF”

condition.

CD, CS (ON)

CIN

tON (EN)

“ON” switch capacitance.

Digital input capacitance.

Delay time between the 50% and 90% points

of the digital input and switch “ON”

condition.

tOFF (EN)

Delay time between the 50% and 90% points

of the digital input and switch “OFF”

condition.

tTRANSITlON

Delay time between the 50% and 90% points

of the digital inputs and the switch “ON”

condition when switching from one address

state to another.

tOPEN

“OFF” time measured between 80% points of

both switches when switching from one

address state to another.

VINL

VINH

IINL (IINH)

Crosstalk

Maximum input voltage for Logic “0.”

Minimum input voltage for Logic “1.”

Input current of the digital input.

A measure of unwanted signal which is

coupled through from one channel to another

as a result of parasitic capacitance.

Off Isolation

A measure of unwanted signal coupling

through an “OFF” channel.

Charge

Injection

A measure of the glitch impulse transferred

from the digital input to the analog output

during switching.

IDD

Positive supply current.

ISS

Negative supply current.

ADG428/ADG429

ADG428 Truth Table

A2 A1 A0 EN WR RS ON SWITCH

Latching

XXXXg 1

Maintains Previous

Switch Condition

Reset

XXXXX0

NONE

(Latches Cleared)

Transparent Operation

XXX0 0 1

000101

001101

010101

011101

100101

101101

110101

111101

NONE

1

2

3

4

5

6

7

8

ADG429 Truth Table

A1 A0 EN WR RS ON SWITCH PAIR

Latching

X

X

X

g

1

Maintains Previous

Switch Condition

Reset

X

X

X

X

0

NONE

(Latches Cleared)

Transparent Operation

X

X

0

0

1

NONE

0

0

1

0

1

1

0

1

1

0

1

2

1

0

1

0

1

3

1

1

1

0

1

4

REV. C

–5–

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