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.

MAX4855

THIN QFN

CONNECT EXPOSED PADDLE TO GROUND.

Pin Configuration

Ordering Information

V

CC

3

MAX4855

NC1

NO1

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

MAX4855

0.75Ω, Dual SPDT Audio Switch with Integrated Comparators

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= 3.0V, TA = +25°C, unless otherwise noted.)

ON-RESISTANCE vs. COM VOLTAGE

MAX4855 toc01

COM VOLTAGE (V)

ON-RESISTANCE (Ω)

42

0

06

VCC = 5.0V

0.5

1.0

1.5

2.0

2.5

3.0

3.5

0

VCC = 3.0V

V

CC

= 2.5V

VCC = 2.3V

VCC = 1.8V

VCC = 2.0V

ON-RESISTANCE vs. COM VOLTAGE

MAX4855 toc02

COM VOLTAGE (V)

ON-RESISTANCE (Ω)

VCC = 3.0V

TA = +85°C

TA = +25°C

TA = -40°C

2.52.01.51.00.5

0.2

0.4

0.6

0.8

1.0

0

0 3.0

4321

0.2

0.4

0.6

0.8

1.0

0

05

ON-RESISTANCE vs. COM VOLTAGE

MAX4855 toc03

COM VOLTAGE (V)

ON-RESISTANCE (Ω)

VCC = 5.0V

TA = +85°C

TA = +25°C

TA = -40°C

MAX4855 toc04

SUPPLY CURRENT vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

4.53.52.51.5 5.5

TA = -40°C

TA = +85°C

TA = +25°C

3

4

5

6

2

TURN-ON/TURN-OFF TIME

vs. SUPPLY VOLTAGE

MAX4855 toc05

SUPPLY VOLTAGE (V)

TURN-ON/TURN-OFF TIME (ns)

4.53.52.51.5 5.5

t

ON

t

OFF

10

20

30

40

50

60

70

0

TURN-ON/TURN-OFF TIME

vs. TEMPERATURE

MAX4855 toc06

TEMPERATURE (°C)

TURN-ON/TURN-OFF TIME (ns)

603510-15-40 85

t

OFF

t

ON

24

26

28

30

32

34

36

38

22

LOGIC THRESHOLD vs. SUPPLY VOLTAGE

MAX4855 toc07

SUPPLY VOLTAGE (V)

LOGIC THRESHOLD (V)

4.53.52.5

0.8

1.0

1.2

1.4

1.6

0.6

1.5 5.5

VIN RISING

VIN FALLING

CHARGE INJECTION vs. COM VOLTAGE

MAX4855 toc08

COM VOLTAGE (V)

CHARGE INJECTION (pC)

432105

VCC = 3V

20

40

60

80

100

120

140

160

180

200

0

VCC = 5V

LEAKAGE CURRENT vs. TEMPERATURE

MAX4855 toc09

TEMPERATURE (°C)

LEAKAGE CURRENT (nA)

603510-15-40 85

COM ON-LEAKAGE

COM OFF-LEAKAGE

0.2

0.4

0.6

0.8

0

MAX4855

0.75Ω, Dual SPDT Audio Switch with Integrated Comparators

_______________________________________________________________________________________ 5

FREQUENCY RESPONSE

MAX4855 toc10

FREQUENCY (MHz)

FREQUENCY RESPONSE (dB)

-80

-60

-40

-20

0

20

-100

1011000.1

OFF-RESPONSE

ON-RESPONSE

CROSSTALK

TOTAL HARMONIC DISTORTION

vs. FREQUENCY

MAX4855 toc11

FREQUENCY (Hz)

THD (%)

10k1k100

0.1

10 100k

1

0.01

RL = 32

Ω

RL = 600

Ω

COMPARATOR THRESHOLD

vs. TEMPERATURE

MAX4855 toc12

TEMPERATURE (°C)

COMPARATOR THRESHOLD (V)

603510-15

1.02

1.04

1.06

1.08

1.10

1.00

-40 85

V

CMPI_

RISING

V

CMPI_

FALLING

VCC = 3.0V

COMPARATOR THRESHOLD

vs. TEMPERATURE

MAX4855 toc13

TEMPERATURE (°C)

COMPARATOR THRESHOLD (V)

603510-15

1.625

1.650

1.675

1.700

1.725

1.750

1.600

-40 85

V

CMPI_

RISING

V

CMPI_

FALLING

VCC = 5.0V

Typical Operating Characteristics (continued)

(VCC= 3.0V, TA = +25°C, unless otherwise noted.)

MAX4855

Detailed Description

The MAX4855 dual SPDT, low on-resistance, low-voltage, analog switch operates from a +2V to +5.5V supply and can handle signals up to the power rails. In addition, the MAX4855 integrates two internal comparators that can be used for headphone or mute detection. The comparator threshold is internally generated to be approximately 1/3 of V

CC

.

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 V

CC

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 consumption. 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 voltage range (see the Typical Operating Characteristics). The switches are bidirectional, so the NO_, NC_, and COM_ pins 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_) is high. When CIN_ rises above VCC/3, COUT_ is low.

The comparator threshold allows for detection of headphones 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 VCCbefore applying analog signals, especially if the analog signal is not current-limited.

0.75Ω, Dual SPDT Audio Switch with Integrated Comparators

6 _______________________________________________________________________________________

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 Common Terminal for Analog Switch 1 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.

10 COM2 Common Terminal for Analog Switch 2 11 COUT1 Output for Comparator 1 12 NO2 Normally Open Terminal for Analog Switch 2 13 COUT2 Output for Comparator 2 14 V

CC

Supply Voltage. Bypass to GND with a 0.01µF capacitor as close to the pin as possible.

15 IN1

Digital Control Input for Analog Switch 1. A logic LOW on IN1 connects COM1 to NC1 and a logic HIGH connects COM1 to NO1.

16 NC1 Normally Closed Terminal for Analog Switch 1 EP — Exposed Paddle. Connect to PC board ground plane.

MAX4855

0.75Ω, Dual SPDT Audio Switch with Integrated Comparators

_______________________________________________________________________________________ 7

Test Circuits/Timing Diagrams

tR < 20ns tF < 20ns

50%

LOGIC INPUT

R

L

COM_

GND

IN_

C

L

INCLUDES FIXTURE AND STRAY CAPACITANCE.

V

OUT

= V

NO (

R

L

)

RL + R

ON

V

NO

t

OFF

0V

NO_

0.9 x V

0UT

0.9 x V

OUT

t

ON

V

OUT

SWITCH OUTPUT

LOGIC INPUT

V

CC

C

L

V

CC

V

OUT

MAX4855

V

CC

0V

Figure 1. Switching Time

50%

V

CC

0V

LOGIC INPUT

V

OUT

0.9 x V

OUT

t

BBM

LOGIC INPUT

R

L

GND

C

L

INCLUDES FIXTURE AND STRAY CAPACITANCE.

NO_

IN_

NC_

V

OUT

V

CC

V

CC

C

L

V

N_

COM_

MAX4855

Figure 2. Break-Before-Make Interval

MAX4855

0.75Ω, Dual SPDT Audio Switch with Integrated Comparators

8 _______________________________________________________________________________________

V

GEN

GND

COM_

C

L

V

OUT

V

CC

V

OUT

IN

OFF

ON

OFF

∆V

OUT

Q = (∆V

OUT

)(CL)

NC_

LOGIC-INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE.

OFF

ON

OFF

IN

V

IL

TO V

IH

V

CC

R

GEN

IN_

MAX4855

OR NO_

Figure 3. Charge Injection

MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF", NO_ OR NC_ TERMINAL ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN COM_ AND "ON", NO_ OR NC_ TERMINAL ON EACH SWITCH. CROSSTALK IS MEASURED FROM ONE CHANNEL TO THE OTHER CHANNEL. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.

+5V

V

OUT

V

CC

IN_

NC1

COM1

NO1*

V

IN

MAX4855

OFF-ISOLATION = 20log

V

OUT

V

IN

ON-LOSS = 20log

V

OUT

V

IN

CROSSTALK = 20log

V

OUT

V

IN

NETWORK ANALYZER

50Ω

50Ω 50Ω

50Ω

MEAS REF

10nF

0V OR V

CC

50Ω

GND

*FOR CROSSTALK THIS PIN IS NO2. NC2 AND COM2 ARE OPEN.

Figure 4. On-Loss, Off-Isolation, and Crosstalk

CAPACITANCE

METER

NC_ OR NO_

COM_

GND

IN

V

IL

OR V

IH

10nF

V

CC

f = 1MHz

V

CC

MAX4855

Figure 5. Channel Off-/On-Capacitance

MAX4855

0.75Ω, Dual SPDT Audio Switch with Integrated Comparators

_______________________________________________________________________________________ 9

MAX4855

V

CC

3

VTH + 100mV

V

TH

- 100mV V

OUT

0V

t

COMP

t

COMP

50%

tR < 20ns t

F

< 20ns

V

CC

V

CC

GND

V

COUT_

CIN_

COUT_

V

CIN_

NO_

V

TH

= VCC/3

COMPARATOR

INPUT (V

CIN_

)

COMPARATOR

OUTPUT (V

COUT_

)

Figure 6. Comparator Switching Time

Chip Information

TRANSISTOR COUNT: 735 PROCESS: CMOS

AUDIO

SOURCE 1

AUDIO

SOURCE 2

V

CC

3

MUTE BUTTON

V

CC

MAX4855

OUT+ OUT-

NC1

NO1

NC2

NO2

COUT

COM1

IN1

IN2

COM2

CIN

8

Ω

SPEAKER

INPUT SELECT

MUTE

Typical Operating Circuit

MAX4855

0.75Ω, Dual SPDT Audio Switch with Integrated Comparators

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

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

0.10 C 0.08 C

0.10 M C A B

D

D/2

E/2

E

A1

A2

A

E2

E2/2

L

k

e

(ND - 1) X e

(NE - 1) X e

D2

D2/2

b

L

e

L

C

L

e

C

L

C

L

C

E

1

2

21-0136

PACKAGE OUTLINE 12, 16L, THIN QFN, 3x3x0.8mm

1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994.

EXPOSED PAD VARIATIONS

2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.

3. N IS THE TOTAL NUMBER OF TERMINALS.

4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE.

5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.20 mm AND 0.25 mm FROM TERMINAL TIP.

6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.

7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.

8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS.

9. DRAWING CONFORMS TO JEDEC MO220 REVISION C.

NOTES:

E

2

21-0136

PACKAGE OUTLINE 12, 16L, THIN QFN, 3x3x0.8mm

DOWN BONDS ALLOWED

MAXIM MAX4855 Technical data

Specifications and Main Features

Frequently Asked Questions

User Manual