MAX4684EBC Просмотр технического описания (PDF) - Maxim Integrated

Номер в каталоге

Компоненты Описание

Список матч

MAX4684EBC

0.5Ω/0.8Ω Low-Voltage, Dual SPDT Analog Switches in UCSP

Maxim Integrated 

0.5Ω/0.8Ω Low-Voltage, Dual SPDT

Analog Switches in UCSP

NAME

NC_

IN_

COM_

NO_

V+

GND

EP

Pin Description

UCSP

A1, C1

A2, C2

A3, C3

A4, C4

B4

B1

—

PIN

µMAX/TDFN

5, 7

4, 8

3, 9

2, 10

1

6

—

FUNCTION

Analog Switch—Normally Closed Terminal

Digital Control Input

Analog Switch—Common Terminal

Analog Switch—Normally Open Terminal

Positive Supply Voltage Input

Ground

Exposed Pad. Connect EP to GND (for TDFN only.)

Detailed Description

The MAX4684/MAX4685 are low on-resistance, low-

voltage, dual SPDT analog switches that operate from a

+1.8V to +5.5V supply. The devices are fully specified

for nominal 3V applications. The MAX4684/MAX4685

have break-before-make switching and fast switching

speeds (tON = 50ns max, tOFF = 40ns max).

The MAX4684 offers asymmetrical normally closed

(NC) and normally open (NO) RON for applications that

require asymmetrical loads (examples include speaker

headsets and internal speakers). The part features a

0.5Ω max RON for its NC switch and a 0.8Ω max RON

for its NO switch at the 2.7V supply. The MAX4685 fea-

tures a 0.8Ω max on-resistance for both NO and NC

switches at the +2.7V supply.

Applications Information

Digital Control Inputs

The MAX4684/MAX4685 logic inputs accept up to

+5.5V regardless of supply voltage. For example, with a

+3.3V supply, IN_ may be driven low to GND and high

to 5.5V. Driving IN_ rail-to-rail minimizes power con-

sumption. Logic levels for a +1.8V supply are 0.5V (low)

and 1.4V (high).

Analog Signal Levels

Analog signals that range over the entire supply voltage

(V+ to GND) are passed with very little change in on-

resistance (see Typical Operating Characteristics). The

switches are bidirectional, so the NO_, NC_, and COM_

pins can be either inputs or outputs.

Power-Supply Sequencing and

Overvoltage Protection

Caution: Do not exceed the absolute maximum rat-

ings because stresses beyond the listed ratings

may cause permanent damage to devices.

Proper power-supply sequencing is recommended for

all CMOS devices. Always apply V+ before applying

analog signals, especially if the analog signal is not

current limited. If this sequencing is not possible, and if

the analog inputs are not current limited to <20mA, add

a small signal diode (D1) as shown in Figure 1. Adding

a protection diode reduces the analog range to a diode

drop (about 0.7V) below V+ (for D1). RON increases

slightly at low supply voltages. Maximum supply volt-

age (V+) must not exceed +6V. Protection diode D1

also protects against some overvoltage situations. No

damage will result on Figure 1’s circuit if the supply

voltage is below the absolute maximum rating applied

to an analog signal pin.

POSITIVE SUPPLY

D1

V+

MAX4684

MAX4685

NO

COM

Vg

GND

Figure 1. Overvoltage Protection Using Two External Blocking

Diodes

6 _______________________________________________________________________________________

Share Link: