MAX4761(2007) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX4761
(Rev.:2007)

High-Bandwidth, Quad DPDT Switches

Maxim Integrated 

High-Bandwidth, Quad DPDT Switches

Detailed Description

The MAX4760 quad double-pole/double-throw (DPDT)

and the MAX4761 octal single-pole/double-throw

(SPDT) analog switches operate from a single +1.8V to

+5.5V supply. These devices are fully specified for +3V

applications.

The MAX4760/MAX4761 have a guaranteed 3.5Ω (max)

on-resistance to switch data or audio signals. The low

25pF capacitance and 0.2ns change in skew makes

them ideal for data switching applications. The MAX4760

has 4 logic inputs to control two switches in pairs and the

MAX4761 has one logic control input and an enable input

(EN) to disable the switches.

Applications Information

Digital Control Inputs

The MAX4760/MAX4761 logic inputs accept up to

+5.5V regardless of the supply voltage. For example,

with a +3.3V supply, IN_ can be driven low to GND and

high to +5.5V, which allows mixed logic levels in a sys-

tem. Driving the control logic inputs rail-to-rail also mini-

mizes power consumption. For a +3V supply voltage,

the logic thresholds are 0.5V (low) and 1.4V (high).

For the MAX4761, drive EN low to enable. When EN is

high, COM_ is high impedance.

Analog Signal Levels

Analog signal inputs over the full voltage range (0V to V+)

are passed through the switch with minimal change in on-

resistance (see the Typical Operating Characteristics).

The switches are bidirectional so NO_, NC_, and COM_

can be either inputs or outputs.

Power-Supply Bypassing

Power-supply bypassing improves noise margin and

prevents switching noise from propagating from the V+

supply to other components. A 0.1µF capacitor connect-

ed from V+ to GND is adequate for most applications.

POSITIVE SUPPLY

V+

D1

NO

COM

MAX4760

MAX4761

GND

Figure 1. Overvoltage Protection Using an External Blocking

Diode

Power-Supply Sequencing

CMOS devices require proper power-supply sequenc-

ing. Always apply V+ before the analog signals, espe-

cially if the input signal is not current limited. If

sequencing is not possible, and the input signal is not

current limited to less than 20mA, add a small-signal

diode (Figure 1). Adding the diode reduces the analog

range to a diode drop (0.7V) below V+ and increases

the on-resistance slightly. The maximum supply voltage

must not exceed +6V at any time.

UCSP Applications Information

For the latest application details on UCSP construction,

dimensions, tape carrier information, printed circuit

board techniques, bump-pad layout, and recommend-

ed reflow temperature profile, as well as the latest infor-

mation on reliability testing results, go to the Maxim

website at www.maxim-ic.com/ucsp for the Application

Note, “UCSP—A Wafer-Level Chip-Scale Package.”

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