MAX382 데이터 시트보기 (PDF) - Maxim Integrated

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MAX382

Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers with Latchable Inputs

Maxim Integrated 

Low-Voltage, 8-Channel/Dual 4-Channel

Multiplexers with Latchable Inputs

RS +3V

+1.5V

0V

VOUT VO

50%

tOFF (RS)

0.8VO

Figure 6. Reset Turn-Off Time (tOFF(RS))

+2.4V

LOGIC

INPUT

+5V

V+

EN

N01

+5V

A0, A1, MAX382 N01–

(A2)

N08

RS

COM, COMB

WR GND V- 1k

VOUT

35pF

-5V

OFF

ON

EN

VOUT

OFF

∆VOUT

∆VOUT IS THE MEASURED VOLTAGE ERROR DUE TO

CHARGE INJECTION. THE CHARGE IN COULOMBS IS Q = CL x ∆VO

Figure 7. Charge Injection (VCTE)

+5V

V+

A0, A1, (A2)

MAX382

RS +2.4V MAX384

RGEN

N0_

VGEN

3V

IN

GND WR

COM

V-

VOUT

CL

100pF

-5V

Operation with Supply Voltages

Other than ±5V

Using supply voltages less than ±5V reduces the analog

signal range. The MAX382/MAX384 muxes operate with

±3V to ±8V bipolar supplies or with a +2.7V to +16.5V

single supply. Connect V- to GND when operating with a

single supply. Both devices can also operate with unbal-

anced supplies, such as +10V and -5V. The Typical

Operating Characteristics graphs show typical on-resis-

tance with ±3V, ±5V, +3V and +5V supplies. (Switching

times increase by a factor of two or more for operation at

+5V or below.)

Overvoltage Protection

Proper power-supply sequencing is recommended for

all CMOS devices. Do not exceed the absolute maxi-

mum ratings, because stresses beyond the listed rat-

ings can cause permanent damage to the devices.

Always sequence V+ on first, then V-, followed by the

logic inputs, NO, or COM. If power-supply sequencing

is not possible, add two small signal diodes (D1, D2) in

series with supply pins for overvoltage protection

(Figure 8). Adding diodes reduces the analog signal

range to one diode drop below V+ and one diode drop

above V-, but does not affect the devices’ low switch

resistance and low leakage characteristics. Device

operation is unchanged, and the difference between V+

and V- should not exceed 17V. These protection diodes

are not recommended when using a single supply.

10 ______________________________________________________________________________________

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