Datasheet

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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 com-

parators 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

15 14 13

5678

NC1

IN1

COUT2

NO2

COUT1

COM2

IN2

CIN1

CIN2

COM1

NO1

GND

NC2

N.C.

MAX4855

THIN QFN

CONNECT EXPOSED PADDLE TO GROUND.

Pin Configuration

Ordering Information

MAX4855

NC1

NO1

0.75Ω

NC2

NO2

COUT2

COM1

IN1

IN2

COM2

CIN2

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

PIN-

PACKAGE

TOP

MARK

MAX4855ETE

-40°C to +85°C 16 TQFN-EP*

ABY

Summary of content (10 pages)

PAGE 1
9-3377; Rev 0; 7/04 0.75Ω, Dual SPDT Audio Switch with Integrated Comparators 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.
PAGE 2
MAX4855 0.75Ω, Dual SPDT Audio Switch with Integrated Comparators ABSOLUTE MAXIMUM RATINGS VCC, IN_, CIN_ to GND ..............................................-0.3V to +6.0V NO_, NC_, COM_, COUT_ (Note 1) ...............-0.3V to (VCC + 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) ....................................
PAGE 3
0.75Ω, Dual SPDT Audio Switch with Integrated Comparators (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 SYMBOL Turn-Off Time tOFF Break-Before-Make Time Delay (Note 3) tD Charge Injection Q CONDITIONS MIN TYP MAX VCC = 2.7V, VNO_ or VNC_ = TA = +25°C 1.5V, RL = 300Ω, CL = 50pF TA = -40°C to +85°C (Figure 1) 30 40 VCC = 2.7V, VNO_ or VNC_ = TA = +25°C 1.
PAGE 4
Typical Operating Characteristics (VCC = 3.0V, TA = +25°C, unless otherwise noted.) MAX4855 toc01 2.0 VCC = 2.0V 1.5 VCC = 2.3V 1.0 VCC = 2.5V VCC = 3.0V VCC = 3.0V 0.8 TA = +25°C TA = +85°C 0.6 0.4 VCC = 5.0V 0.8 ON-RESISTANCE (Ω) VCC = 1.8V 2.5 ON-RESISTANCE (Ω) TA = +85°C 0.4 TA = -40°C VCC = 5.0V 0.2 0.2 TA = -40°C 0.5 0 2 4 0 6 0.5 1.0 1.5 2.0 2.5 0 3.0 1 2 3 4 COM VOLTAGE (V) COM VOLTAGE (V) COM VOLTAGE (V) SUPPLY CURRENT vs.
PAGE 5
0.75Ω, Dual SPDT Audio Switch with Integrated Comparators TOTAL HARMONIC DISTORTION vs. FREQUENCY FREQUENCY RESPONSE ON-RESPONSE 0 THD (%) -20 -40 OFF-RESPONSE RL = 32Ω 0.1 -60 RL = 600Ω CROSSTALK -80 -100 0.01 0.1 1 10 100 100 1k 10k FREQUENCY (Hz) COMPARATOR THRESHOLD vs. TEMPERATURE COMPARATOR THRESHOLD vs. TEMPERATURE VCMPI_ RISING 1.06 1.04 VCMPI_ FALLING VCC = 5.0V VCMPI_ RISING 1.725 100k MAX4855 toc13 1.08 1.750 COMPARATOR THRESHOLD (V) MAX4855 toc12 VCC = 3.0V 1.
PAGE 6
0.75Ω, Dual SPDT Audio Switch with Integrated Comparators MAX4855 Pin Description PIN NAME FUNCTION 1, 8 N.C. No Connection. Not internally connected. 2 CIN1 Inverting Input for Comparator 1 3 CIN2 Inverting Input for Comparator 2 4 COM1 5 NO1 Normally Open Terminal for Analog Switch 1 6 GND Ground 7 NC2 Normally Closed Terminal for Analog Switch 2 9 IN2 Digital Control Input for Analog Switch 2. A logic LOW on IN2 connects COM2 to NC2 and a logic HIGH connects COM2 to NO2.
PAGE 7
0.75Ω, Dual SPDT Audio Switch with Integrated Comparators MAX4855 VCC t R < 20ns t F < 20ns V CC VNO COM_ NO_ VOUT RL VCC 50% 0V t OFF CL SWITCH OUTPUT IN_ GND LOGIC INPUT LOGIC INPUT VOUT 0.9 x V0UT 0.9 x VOUT 0V t ON CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL RL + RON VOUT = VNO ( ) Figure 1. Switching Time V CC MAX4855 LOGIC INPUT V CC VN_ 50% 0V NC_ VOUT COM_ NO_ RL IN_ LOGIC INPUT VCC CL GND 0.9 x VOUT VOUT tBBM CL INCLUDES FIXTURE AND STRAY CAPACITANCE. Figure 2.
PAGE 8
MAX4855 0.75Ω, Dual SPDT Audio Switch with Integrated Comparators V CC ∆VOUT MAX4855 VCC RGEN VOUT COM_ NC_ OR NO_ VOUT IN OFF CL V GEN GND ON OFF IN_ VIL TO VIH OFF IN ON OFF Q = (∆V OUT )(C L ) LOGIC-INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE. Figure 3.
PAGE 9
0.75Ω, Dual SPDT Audio Switch with Integrated Comparators VTH + 100mV VCC NO_ VCC 3 COMPARATOR INPUT (VCIN_) VCC VCIN_ 50% 50% VTH - 100mV COUT_ VOUT VCOUT_ CIN_ COMPARATOR OUTPUT (VCOUT_) GND MAX4855 tR < 20ns tF < 20ns MAX4855 tCOMP tCOMP 50% 50% 0V VTH = VCC/3 Figure 6.
PAGE 10
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 12x16L QFN THIN.EPS MAX4855 0.75Ω, Dual SPDT Audio Switch with Integrated Comparators D2 0.10 M C A B b D D2/2 D/2 E/2 E2/2 CL (NE - 1) X e E E2 L k e CL (ND - 1) X e CL CL 0.10 C 0.08 C A A2 A1 L L e e PACKAGE OUTLINE 12, 16L, THIN QFN, 3x3x0.