MAX4850 データシートの表示（PDF） - Maxim Integrated

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MAX4850

Dual SPDT Analog Switches with Over-Rail Signal Handling

Maxim Integrated 

Dual SPDT Analog Switches with

Over-Rail Signal Handling

Detailed Description

The MAX4850/MAX4850H/MAX4852/MAX4852H are low

on-resistance, low-voltage, analog switches that operate

from a +2V to +5.5V single supply and are fully specified

for nominal 3.0V applications. These devices feature

over-rail signal capability that allows signals up to 5.5V

with supply voltages down to 2.0V. These devices are

configured as dual SPDT switches.

These switches have low 50pF on-channel capacitance,

which allows for 12Mbps switching of the data signals for

USB 2.0 full speed/1.1 applications. The MAX485_ _ are

designed to switch D+ and D- USB signals with a guaran-

teed skew of less than 1ns (see Figure 1), as measured

from 50% of the input signal to 50% of the output signal.

The MAX4850_ features a comparator that can be used

for headphone or mute detection. The comparator

threshold is internally generated to be approximately 1/3

of VCC.

Applications Information

Digital Control Inputs

The logic inputs (IN_) accept up to +5.5V even if the

supply voltages are below this level. For example, with a

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

high to +5.5V, allowing for mixing of logic levels in a

system. Driving IN_ rail-to-rail minimizes power con-

sumption. For a +2V supply voltage, the logic thresholds

are 0.5V (low) and 1.4V (high); for a +5V supply voltage,

the logic thresholds are 0.8V (low) and 1.8V (high).

Analog Signal Levels

The on-resistance of these switches changes very little

for analog input signals across the entire supply volt-

age range (see Typical Operating Characteristics). The

switches are bidirectional, so NO_, NC_, and COM_

can be either inputs or outputs.

Comparator

The positive terminal of the comparator is internally set to

VCC/3. When the negative terminal (CIN_) is below the

threshold (VCC/3), the comparator output (COUT_) goes

high. When CIN_ rises above VCC/3, COUT_ goes low.

The comparator threshold allows for detection of head-

phones since headphone audio signals are typically

biased to VCC/2.

Power-Supply Sequencing

Caution: Do not exceed the absolute maximum ratings

because stresses beyond the listed ratings may cause

permanent damage to the device.

Proper power-supply sequencing is recommended for

all CMOS devices. Always apply VCC before applying

analog signals, especially if the analog signal is not

current-limited.

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