MAXIM MAX4991, MAX4994 Technical data

General Description

The MAX4991–MAX4994 low on-resistance analog switches operate from a single +1.8V to +5.5V supply. The MAX4991/MAX4993 feature a slow turn-on time to reduce clicks and pops due to coupling capacitors and audio amplifiers with a DC output bias. This feature provides click-and-pop reduction without adding additional parts for existing architectures.

The MAX4991/MAX4992 are dual single-pole/doublethrow (SPDT) switches, while the MAX4993/MAX4994 are double-pole/double-throw (DPDT) switches. The MAX4993/MAX4994 feature an active-low enable input (EN) that sets all the channels to high impedance and reduces supply current when driven high. These devices have 0.3Ω on-resistance and 0.004% THD+N to route high fidelity audio signals.

The MAX4991–MAX4994 are available in space-saving 10-pin UTQFN (1.4mm x 1.8mm) package, and are specified for operation over the -40°C to +85°C extended temperature range.

Applications

Speaker Headset Source Switching

Cellular Phones

Portable MP3 Players

Audio Signal Routing

Features

♦ Slow Turn-On for Click-and-Pop Reduction Without

Additional Parts

♦ Low 0.3Ω On-Resistance

♦ Low R

ON

Flatness (1mΩ)

♦ Low THD+N: 0.004%

♦ +1.8V to +5.5V Single-Supply Operation

♦ 1.2µA (typ) Supply Current

♦ Space-Saving Packages

10-Pin UTQFN (1.4mm x 1.8mm x 0.55mm)

MAX4991–MAX4994

Low R

ON

, Dual-SPDT/Single-DPDT Analog

Switches with Slow Turn-On Time

________________________________________________________________

Maxim Integrated Products

1

Ordering Information/Selector Guide

19-4150; Rev 1; 6/09

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

Note: All devices operate over -40°C to +85°C extended temperature range.

+

Denotes a lead(Pb)-free/RoHS-compliant package.

*

Future product—contact factory for availability.

Typical Application Circuit appears at end of data sheet.

Pin Configurations

TOP VIEW

CB2

COM2

NO2

COM2

NO2

8

9

10

8

EN

9

10

NC2

7 6

MAX4991/

MAX4992

1 2

CC

V

UTQFN

NC2

7 6

MAX4993/

MAX4994

1 2

CC

V

UTQFN

GND

NO1

GND

NO1

5

NC1

4

CB1

3

COM1

5

NC1

4

CB

3

COM1

PART PIN-PACKAGE CONFIGURATION

MAX4991EVB+* 10 UTQFN Dual SPDT Yes No AAD

MAX4992EVB+ 10 UTQFN Dual SPDT No No AAE

MAX4993EVB+ 10 UTQFN DPDT Yes Yes AAF

MAX4994EVB+* 10 UTQFN DPDT No Yes AAG

SLOW-SWITCHING

TIME

ENABLE LINE

TOP

MARK

MAX4991–MAX4994

Low R

ON

, Dual-SPDT/Single-DPDT Analog

Switches with Slow Turn-On Time

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.) (Note 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.

(Voltages referenced to GND.) V

CC

, CB_, EN ........................................................-0.3V to +6.0V

COM_, NC_, NO_ ...................................... -0.3V to (V

CC

+ 0.3V)

Continuous Current COM_, NC_, NO_ ...........................±350mA

Peak Current COM_, NC_, NO_ (pulsed at 1ms,

50% duty cycle)..........................................................±700mA

Peak Current COM_, NC_, NO_ (pulsed at 1ms,

10% duty cycle)..............................................................±1.5A

Continuous Power Dissipation (T

A

= +70°C)

10-Pin UTQFN (derate 6.9mW/°C above +70°C).........559mW

Junction-to-Case Thermal Resistance (

θ

JC

) (Note 1)

10-Pin UTQFN ...........................................................20.1°C/W

Junction-to-Ambient Thermal Resistance (

θ

JA

) (Note 1)

10-Pin UTQFN .........................................................143.1°C/W

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

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

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

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

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer

board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial

.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Power-Supply Range V

Undervoltage Lockout V

Supply Current (MAX4991/MAX4992)

Supply Current (MAX4993/MAX4994)

Power-Supply Rejection Ratio

Analog Signal Range

On-Resistance R

On-Resistance Match Between Channels

On-Resistance Flatness R

COM_ Output Noise N

PSRR R

V

NC_

V

R

CC

UVLO

I

CC

I

CC

, V

COM_

ON

FLAT

COM_

1.8 5.5 V

1.4 V

V

= V

CB1

V

CB1

+1.4V

VEN = VCC, VCB = 0V or VCC VCC = +5.5V 0.1 1

VEN = 0V, VCB = 0V or V

VEN = VCB = +0.5V or +1.4V

= RS = 50, f = 20kHz 80 dB

L

,

NO_

0 VCC V

VCC = +2.7V, V to V

CC

VCC = +2.7V, between NC_, NO_ only, I

COM_

VCC = +2.7V, V I

COM_

V

NC_

= 0V or V

CB2

= V

= +0.5V or

CB2

or V

, I

= 100mA, V

= 100mA (Note 3)

= V

NC_

= 100mA

COM_

NC_

= 0V, RL = 50

NO_

NC_

or V

CC

NO_

or V

NO_

VCC = +3V 1.2 2.5

V

= +5.5V 3.1 6

CC

VCC = +2.7V 3

= +5.5V 14

V

CC

VCC = +3V 1.2 2.5

VCC = +5.5V 3.1 6

VCC = +2.7V 3

= +5.5V 8.5

V

CC

TA = +25°C 0.3 0.5

= 0

T

= T

MIN

to T

MAX

A

= VCC/2

NO_

= 0 to VCC,

f = 20Hz to 20kHz 1

f = 0Hz to 1MHz 50

0.6

3 m

1 m

μV

μA



RMS

MAX4991–MAX4994

Low R

ON

, Dual-SPDT/Single-DPDT Analog

Switches with Slow Turn-On Time

_______________________________________________________________________________________ 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.) (Note 2)

Note 2: All devices are 100% production tested at TA= +25°C. All temperature limits are guaranteed by design. Note 3: Flatness is defined as the difference between the maximum and minimum values of on-resistance as measured over the

specified analog ranges.

Note 4: All timing is measured using 10% and 90% levels. Note 5: Off-isolation = 20log [V

COM_

/(V

NO_

or V

NC_

)], V

COM_

= output, V

NO_

or V

NC_

= input to off switch.

Note 6: Between any two switches.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

NC_, NO_, Off-Leakage Current

COM_ Off-Leakage Current (MAX4993/MAX4994)

COM_ On-Leakage Current I

I

L(OFF)

I

COM_L(OFF)

COM_L(ON)

VCC = +2.7V, switch open, V or V

, V

COM_

= VCC or 0V

NC_

= VCC or 0V

CC

VCC = +2.7V, VEN = VCC, V or V

CC

VCC = +2.7V, switch closed, V V

or unconnected, V

CC

= 0V, VCC, or

COM_

NC_

or V

NC_

NO_

or V

NO_

= 0V

= 0V,

NO_

-100 +100 nA

60 140 nA

unconnected

DYNAMIC

Turn-On Time (Note 4) (Figure 1)

Turn-Off Time t

Off-Isolation V

Crosstalk V

t

ON

OFF

ISO

CT

Total Harmonic Distortion THD+N

NC_, NO_ Off-Capacitance C

COM_ On-Capacitance C

OFF

ON

VCC = +2.7V, V

= 35pF (MAX4991/MAX4993)

C

L

VCC = +2.7V, V

= 35pF (MAX4992/MAX4994)

C

L

VCC = +2.7V, V

= 35pF, Figure 1 (Note 4)

C

L

RS = RL = 50, f = 20kH z, V Figure 2 (Note 5)

RS = RL = 50, f = 20kH z, V Figure 2 (Note 6)

f = 20Hz to 20kHz, V

= RL = 50, DC bias = 0V

R

S

COM_ = GND (DC bias), f = 1MHz,

= 100mV

V

NO(NC)

COM_ = GND (DC bias), f = 1MHz,

= 100mV

V

COM

or V

NC_

or V

NC_

or V

NC_

P-P

(Figure 3)

P-P

= +1.5V, RL = 50,

NO_

= +1.5V, RL = 50,

NO_

= +1.5V, RL = 50,

NO_

COM_

= 0.5V

COM_

, (Figure 3)

= 1V

P-P

120 360 630 m s

20 150 μs

0.5 2 μs

,

P-P

,

P-P

,

-90 dB

-110 dB

0.004 %

45 pF

65 pF

DIGITAL I/O (CB, CB1, CB2, EN)

Input Logic-High VIH 1.4 V

Input Logic-Low V

Input Leakage Current I

IL

CB

0.5 V

V

= VEN = 0V or VCC -1 +1 μA

CB_

MAX4991–MAX4994

Low R

ON

, Dual-SPDT/Single-DPDT Analog

Switches with Slow Turn-On Time

4 _______________________________________________________________________________________

Test Circuits/Timing Diagrams

Figure 2. On-Loss, Off-Isolation, and Crosstalk

Figure 3. Channel Off-/On-Capacitance

Figure 1. Switching Time

MAX4991/MAX4992/

MAX4993/MAX4994

COM_

L

)

ON

LOGIC INPUT

NO_

V

IN_

OR NC_

CB_

C

INCLUDES FIXTURE AND STRAY CAPACITANCE.

L

OUT

= V

IN_ (

R V RL + R

0V OR V

CC

50Ω

CB_

MAX4991/MAX4992/

NC1

MAX4993/MAX4994

V

CC

NO_

COM_

V

IH

LOGIC

INPUT

V

OUT

R

L

V

IN

V

OUT

C

L

SWITCH

OUTPUT

NETWORK ANALYZER

50Ω

MEAS REF

50Ω 50Ω

IL

0V

50Ω

50%

V

OUT

0.9 x V

0UT

t

ON

IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH.

OFF-ISOLATION = 20log

ON-LOSS = 20log

CROSSTALK = 20log

tR < 5ns tF < 5ns

t

OFF

0.1 x V

OUT

V

OUT

V

IN

V

OUT

V

IN

V

OUT

V

IN

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 ALL OTHER CHANNELS. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.

MAX4991/MAX4992/

MAX4993/MAX4994

COM_

CAPACITANCE

METER

f = 1MHz

CB

NC_ OR NO_

OR V

V

IL

IH

MAX4991–MAX4994

Low R

ON

, Dual-SPDT/Single-DPDT Analog

Switches with Slow Turn-On Time

_______________________________________________________________________________________ 5

Typical Operating Characteristics

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

0.6

ON-RESISTANCE vs. V

0.5

0.4

0.3

0.2

ON-RESISTANCE (Ω)

0.1

0

05

VCC = +1.8V

VCC = +2.7V

V

COM

(V)

COM

VCC = +3.3V

VCC = +5.0V

4213

0.50

0.45

0.40

MAX4991-MAX4994 toc01

0.35

0.30

0.25

ON-RESISTANCE (Ω)

0.20

0.15

0.10

QUIESCENT SUPPLY CURRENT

vs. TEMPERATURE

4.0 V

= V

CB2(EN)

VCC = 5.5V

VCC = 2.7V

= 0V

MAX4991-MAX4994 toc04

QUIESCENT SUPPLY CURRENT (μA)

35-15

TA (°C)

CB1

3.5

3.0

2.5

2.0

1.5

1.0

QUIESCENT SUPPLY CURRENT (μA)

0.5

0

-40 10 60 85

ON-RESISTANCE vs. V

VCC = +2.7V

03

TA = +85°C

TA = +25°C

TA = -40°C

12

V

COM

0.300

0.298

MAX4991-MAX4994 toc02

0.296

0.294

ON-RESISTANCE (Ω)

0.292

0.290

(V)

QUIESCENT SUPPLY CURRENT

vs. SUPPLY VOLTAGE

3.5 V

= V

CB2(EN)

2.5

= 0V

VCC (V)

CB1

3.0

2.5

2.0

1.5

1.0

0.5

0

1.5 4.53.5 5.5

10

MAX4991-MAX4994 toc05

QUIESCENT SUPPLY CURRENT (μA)

9

8

7

6

5

4

3

2

1

0

RON FLATNESS vs. V

VCC = +2.7V

03

12

QUIESCENT SUPPLY CURRENT

vs. LOGIC LEVEL

0624

VCB or V

COM

MAX4991-MAX4994 toc03

V

(V)

COM

VCC = +5.5V

= VEN = 0V

V

CB2

MAX4991-MAX4994 toc06

(V)

CB1

TURN-ON TIME vs. SUPPLY VOLTAGE

400

MAX4991/MAX4993

390

380

370

360

350

340

TURN-ON TIME (ms)

330

320

310

300

2.5 4.53.5 5.5 SUPPLY VOLTAGE (V)

30

25

MAX4991-MAX4994 toc07

20

15

10

TURN-ON TIME (μs)

TURN-ON TIME vs. SUPPLY VOLTAGE

MAX4992/MAX4994

5

0

2.5 4.53.5 5.5 SUPPLY VOLTAGE (V)

500

450

400

350

MAX4991-MAX4994 toc08

300

250

200

TURN-OFF TIME (ns)

150

100

50

TURN-OFF TIME vs. SUPPLY VOLTAGE

0

2.5 4.53.5 5.5 SUPPLY VOLTAGE (V)

MAX4991-MAX4994 toc09

MAX4991–MAX4994

Low R

ON

, Dual-SPDT/Single-DPDT Analog

Switches with Slow Turn-On Time

6 _______________________________________________________________________________________

Pin Description

Typical Operating Characteristics (continued)

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

20

0

-20

-40

-60

-80

MAGNITUDE (dB)

-100

-120

-140

-160

M A X4 9 9 1 / M A X4 9 9 2 M A X4 9 9 3 / M A X4 9 9 4

FREQUENCY RESPONSE

ON-RESPONSE

OFF-RESPONSE

CROSSTALK

10 100,000

100 10,0001000

FREQUENCY (Hz)

MAX4991-MAX4994 toc10

THD+N (%)

0.001

NAME FUNCTION

11V

2 2 NO1 Analog Switch 1—Normally Open Terminal

3 3 COM1

4 — CB1 Digital Control Input for Switch 1

— 4 CB Digital Control Input for Switch 1 and Switch 2

5 5 NC1 Analog Switch 1—Normally Closed Terminal

6 6 GND Ground

7 7 NC2 Analog Switch 2—Normally Closed Terminal

8 — CB2 Digital Control Input for Switch 2

—8EN

9 9 COM2

10 10 NO2 Analog Switch 2—Normally Open Terminal

TOTAL HARMONIC DISTORTION + NOISE

1

RL = 50Ω

0.1

0.01

10 100,000

CC

vs. FREQUENCY

100 1000

FREQUENCY (Hz)

Positive-Supply Voltage Input. Bypass VCC to GND with a 0.1µF capacitor as close as possible to the device.

Analog Switch 1—Common Terminal. COM1 must be connected to the speaker load for click-and-pop reduction.

Active-Low Enable Input—Drive EN high to put switches in high impedance. Drive EN low for normal operation.

Analog Switch 2—Common Terminal. COM2 must be connected to the speaker load for click-and-pop reduction.

MAX4991-MAX4994 toc11

SLOW TURN-ON RESPONSE

VCC = +2.8V

= 100μF

C

CL

= 16Ω

R

L

20ms/div

MAX4991 toc12

V

IN

2V/div

V

COM

1V/div

I

COM

10mA/div

Detailed Description

The MAX4991–MAX4994 low 0.3Ω (typ) on-resistance analog switches have break-before-make switching and operate from a single +1.8V to +5.5V supply. The MAX4991/MAX4993 provide a slow turn-on time, and with COM_ used as the output, reduce clicks and pops due to coupling capacitors and audio amplifiers with a DC output bias. This feature is important for existing architectures with coupling capacitors at the output that need click-and-pop reduction.

The MAX4993/MAX4994 DPDT switches with an activelow enable input (EN) set all channels to high impedance and reduce supply current when driven high. The MAX4991–MAX4994 have a low 0.004% THD+N to route high-fidelity audio signals.

Digital Control Input

The MAX4991/MAX4992 have two digital control logic inputs, CB1 and CB2. The MAX4993/MAX4994 have a single digital-control logic input, CB. The digital control logic inputs control the position of the corresponding switch as shown in the

Functional Diagram

. Driving

logic inputs rail-to-rail minimizes power consumption.

Enable Input (MAX4993/MAX4994)

The MAX4993/MAX4994 feature an active-low enable input (EN). When EN is driven high, the switches are high impedance and reduce supply current. When EN is driven low, the MAX4993/MAX4994 operate in normal mode. Driving EN rail-to-rail minimizes power consumption.

MAX4991–MAX4994

Low R

ON

, Dual-SPDT/Single-DPDT Analog

Switches with Slow Turn-On Time

_______________________________________________________________________________________ 7

Functional Diagram

CB1

NC1

NO1

NC2

NO2

CB2

MAX4991/MAX4992

CB1 NO1

0

1ONOFF

CB2 NO2

0

1ONOFF

OFF

MAX4991/MAX4992

OFF

NC1

ON

NC2

ON

COM1

COM2

CB

NC1

NO1

NC2

NO2

EN

MAX4993/MAX4994

EN

0

1

X = DON'T CARE.

MAX4993/MAX4994

COM1

COM2

NC_

NO_

CB

OFF

0

1

OFF

X

ON

OFF

ON

OFF

MAX4991–MAX4994

Analog Signal Levels

The MAX4991–MAX4994 have a very low and stable RON, 0.3Ω (typ), as the analog input signals are swept from ground to VCC(see

Typical Operating Character-

istics

). These switches are bidirectional, allowing NO_, NC_, and COM_ to be configured as either inputs or outputs; however, click-and-pop reduction is only operational when COM_ is used as the output.

Power-Supply Rejection Ratio

PSRR is the measurement of AC power-supply ripple or noise that couples to the output. Variations in supply voltage corrupt the audio signal due to changes in the R

ON

value by supply modulation. The MAX4991–MAX4994 maintain a 80dB (typ) PSRR across the supply-voltage range, eliminating any corruption of the audio signal from supply variations. Therefore, with no audio signal, the R

ON

variation due to supply-voltage ripple does not contribute to any output signal modulation.

Applications Information

Click-Pop Reduction

The MAX4991/MAX4993 feature a slow switch turn-on that can reduce click-and-pop noise caused by abrupt changes in voltage across a speaker. These voltage

changes usually occur when a single-supply audio amplifier with a DC bias is turned on, causing a spike of current in the speaker while the coupling capacitor charges (see the

Typical Operating Circuit

). If the audio amplifier connected to the unused input is powered up before the switch position changes, the MAX4991/ MAX4993 reduce the current spike to COM_. The speaker load must be present so that the current charging the coupling capacitor has a path to ground.

Layout

Good layout improves performance by decreasing the amount of stray capacitance and noise. Minimize PCB trace lengths and resistor leads and place external components as close as possible to the device.

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 devices. Always apply VCCbefore applying analog signals especially if the analog signal is not current limited.

Low R

ON

, Dual-SPDT/Single-DPDT Analog

Switches with Slow Turn-On Time

8 _______________________________________________________________________________________

MAX4991–MAX4994

Low R

ON

, Dual-SPDT/Single-DPDT Analog

Switches with Slow Turn-On Time

_______________________________________________________________________________________ 9

Typical Application Circuit

Chip Information

PROCESS: BiCMOS

Package Information

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages

.

PACKAGE TYPE PACKAGE CODE DOCUMENT NO.

10 UTQFN V101AICN-1

21-0028

AUDIO

AMPLIFIER

AUDIO

AMPLIFIER

NC1

NC2

NO1

NO2

V

CC

0.1μF

MAX4991/MAX4992

GND

CB1

COM1

COM2

CB2

MAX4991–MAX4994

Low R

ON

, Dual-SPDT/Single-DPDT Analog

Switches with Slow Turn-On Time

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

Revision History

REVISION

NUMBER

0 5/08 Initial release. —

1 6/09

REVISION

DATE

DESCRIPTION

• Corrected names of power pins (added subscripting) in Electrical Characteristics.

• Changed the name of TOC 10 to “Frequenc y Re sponse.”

• Added units of measure to TOC 12.

PAGES

CHANGED

2, 6

MAXIM MAX4991, MAX4994 Technical data

Specifications and Main Features

Frequently Asked Questions

User Manual