MAXIM MAX4855 Technical data

General Description

The MAX4855 dual, single-pole/double-throw (SPDT)
switch operates from a single +2V to +5.5V supply and
features rail-to-rail signal handling. The MAX4855 has
low on-resistance (0.75Ω) with a +3V supply making it
ideal for audio switching applications in portable
devices. The device also integrates two internal com­parators that can be used for headphone detection or
mute/send key functions.

The MAX4855 is available in the space-saving (3mm x
3mm), 16-pin thin QFN package and operates over the
extended temperature range of -40°C to +85°C.

Applications

Speaker Headset Switching
Audio-Signal Routing
Cellular Phones
Notebook Computers
PDAs and Other Handheld Devices

Features

♦ Audio Signal Routing
♦ 0.75Ω On-Resistance
♦ 0.18Ω On-Resistance Flatness
♦ 0.07Ω Channel-to-Channel Matching
♦ Rail-to-Rail Signal Handling
♦ 2 Integrated Comparators
♦ 1.8V Logic Compatible
♦ 2V to 5.5V Supply Range
♦ Available in a Space-Saving (3mm x 3mm),

16-Pin TQFN Package

MAX4855

0.75Ω, Dual SPDT Audio Switch with
Integrated Comparators

________________________________________________________________ Maxim Integrated Products 1

TOP VIEW

16

1

2

3

4

12

11

10

9

15 14 13

5678

NC1

IN1

VCCCOUT2

NO2

COUT1

COM2

IN2

CIN1

CIN2

COM1

NO1

GND

NC2

N.C.

N.C.

MAX4855

THIN QFN

CONNECT EXPOSED PADDLE TO GROUND.

Pin Configuration

Ordering Information

V

CC

3

MAX4855

NC1

NO1

0.75Ω

0.75Ω

NC2

NO2

COUT2

COM1

IN1

IN2

COM2

CIN2

V

CC

3

COUT1

CIN1

MAX4855

IN_ NO_ NC_

0 OFF ON
1 ON OFF

SWITCHES SHOWN FOR
LOGIC 0 INPUT

Block Diagram/Truth Table

19-3377; Rev 0; 7/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

*EP = Exposed paddle.

PART

TEMP RANGE

PIN­PACKAGE

TOP

MARK

MAX4855ETE

ABY

-40°C to +85°C 16 TQFN-EP*

MAX4855

0.75Ω, Dual SPDT Audio Switch with
Integrated Comparators

2 _______________________________________________________________________________________

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

Note 1: Signals on NO, NC, or COM exceeding VCCor GND are clamped by internal diodes. Signals on IN exceeding GND are

clamped by an internal diode. Limit forward-diode current to maximum current rating.

ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= +3.0V, TA= +25°C, unless other­wise noted.) (Note 2)

PARAMETER

CONDITIONS

UNITS

Supply Voltage V

CC

2 5.5 V

Supply Current I

CC

VCC = 5.5V, V

IN_

= 0V or V

CC

510µA

ANALOG SWITCH

Analog Signal Range

V

NO_

,

V

NC_

,

V

COM_

0

V

TA = +25°C

1

On-Resistance (Note 3) R

ON

VCC = 2.7V, I

COM_

=

100mA, V

NC_

or V

NO_

= 0V

to V

CC

TA = -40°C to +85°C 1.1

Ω

TA = +25°C

On-Resistance Match
Between Channels
(Notes 3, 4)

∆R

ON

VCC = 2.7V, I

COM

= 100mA,

V

NC_

or V

NO_

= 1.5V

T

A

= -40°C to +85°C

Ω

TA = +25°C

On-Resistance Flatness
(Note 5)

R

FLAT

VCC = 2.7V, I

COM_

=

100mA, V

NC_

or V

NO_

=

0.75V, 1.5V, 1.75V

T

A

= -40°C to +85°C 0.3

Ω

TA = +25°C -2 +2

NO_/NC_ Off-Leakage
Current (Note 2)

I

OFF

VCC = 5.5V, V

NC_

or V

NO_

=

1V or 4.5V, V

COM_

= 4.5V or

1V

T

A

= -40°C to +85°C -10

nA

TA = +25°C -2 +2

COM_ On-Leakage
Current (Note 2)

I

ON

VCC = 5.5V; V

NC_

or V

NO_

=

1V, 4.5V, or floating; V

COM_

= 1V, 4.5V, or floating

T

A

= -40°C to +85°C -15

nA

DYNAMIC CHARACTERISTICS

TA = +25°C 40 60

Turn-On Time t

ON

VCC = 2.7V, V

NO_

or V

NC_

=

1.5V, R

L

= 300Ω, CL = 50pF

(Figure 1)

T

A

= -40°C to +85°C 100

ns

ABSOLUTE MAXIMUM RATINGS

VCC, IN_, CIN_ to GND ..............................................-0.3V to +6.0V

NO_, NC_, COM_, COUT_ (Note 1) ...............-0.3V to (V

CC

+ 0.3V)

COUT_ Continuous Current...................................................±20mA

Closed Switch Continuous Current COM_, NO_, NC_.......±300mA

Peak Current COM_, NO_, NC_

(pulsed at 1ms, 50% duty cycle) ....................................±400mA

Peak Current COM_, NO_, NC_

(pulsed at 1ms, 10% duty cycle) ....................................±500mA

Continuous Power Dissipation (T

A

= +70°C)

16-Pin Thin QFN (derate 20.8mW/°C above +70°C).....1667mW

Operating Temperature Range................................-40°C to +85°C

Junction Temperature...........................................................+150°C

Storage Temperature Range .................................-65°C to +150°C

Lead Temperature (soldering, 10s)......................................+300°C

SYMBOL

MIN TYP MAX

V

CC

0.75

0.075 0.120

0.135

0.18 0.275

+10

+15

MAX4855

0.75Ω, Dual SPDT Audio Switch with
Integrated Comparators

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.7V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= +3.0V, TA= +25°C, unless other­wise noted.) (Note 2)

PARAMETER

CONDITIONS

UNITS

TA = +25°C 30 40

Turn-Off Time t

OFF

VCC = 2.7V, V

NO_

or V

NC_

=

1.5V, R

L

= 300Ω, CL = 50pF

(Figure 1)

T

A

= -40°C to +85°C 60

ns

TA = +25°C 15

Break-Before-Make Time
Delay (Note 3)

t

D

VCC = 2.7V, V

NO_

or V

NC_

=

1.5V, R

L

= 50Ω, CL = 50pF

(Figure 2)

T

A

= -40°C to +85°C 2

ns

Charge Injection Q V

COM_

= 1.5V, RS = 0Ω, CL = 1.0nF (Figure 3)

pC

Off-Isolation (Note 6)

f = 100kHz, V

COM_

= 1V

RMS

, RL = 50Ω, CL = 5pF

(Figure 4)

-75 dB

Crosstalk V

CT

f = 100kHz, V

COM_

= 1V

RMS

, RL = 50Ω, CL = 5pF

(Figure 4)

-93 dB

-3dB Bandwidth BW Signal = 0dBm, RL = 50Ω, CL = 5pF (Figure 4) 38

MHz

Total Harmonic Distortion

THD f = 20Hz to 20kHz, V

COM_

= 1V + 2V

P-P

, RL = 32Ω

%

NO_/NC_ Off­Capacitance

C

OFF

f = 1MHz (Figure 5) 50 pF

COM On-Capacitance C

ON

f = 1MHz (Figure 5)

pF

DIGITAL I/O (IN_)

VCC = 2V to 3.6V 1.4

Input-Logic High Voltage

V

IH

VCC = 3.6V to 5.5V 1.8

V

VCC = 2V to 3.6V 0.5

Input-Logic Low Voltage

V

IL

VCC = 3.6V to 5.5V 0.8

V

Input Leakage Current I

IN

V

IN_

= 0 or 5.5V

µA

COMPARATOR

Comparator Range 0 5.5 V
Comparator Threshold VCC = 2V to 5.5V, falling input

0.3 x

0.33 x

0.36 x
V

Comparator Hysteresis VCC = 2V to 5.5V 50 mV
Comparator Output High

Voltage

I

SOURCE

= 1mA

V

CC

­V

Comparator Output Low
Voltage

I

SINK

= 1mA 0.4 V

Rising input (Figure 6) 2.5

Comparator Switching
Time

Falling input (Figure 6) 0.5

µs

Note 2: Specifications are 100% tested at TA= +85°C only, and guaranteed by design and characterization over the specified

temperature range.

Note 3: Guaranteed by design and characterization; not production tested.
Note 4: ∆R

ON

= R

ON(MAX)

- R

ON(MIN)

.

Note 5: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the

specified analog signal ranges.

Note 6: Off-Isolation = 20log

10(VCOM_

/ V

NO_

), V

COM_

= output, V

NO_

= input to off switch.

SYMBOL

MIN TYP MAX

170

-0.5 +0.5

V

CC

0.07

150

V

CC

0.4V

V

CC