Rainbow Electronics MAX4912 User Manual

MAX4910/MAX4911/MAX4912

Quad-SPDT, Clickless Audio Switches

with Negative Signal Handling

________________________________________________________________ Maxim Integrated Products 1

19-3854; Rev 0; 2/06

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.

15

16

14

13

5

6

7

8

COM4 NO4 EN NC3

NC1 CB NO2 COM2

13

V

CC

4

12 10 9

NO1

COM1

COM3

NO3

GND

NC2

MAX4911

2

11

NC4

THIN QFN

3 mm x 3 mm

+

15

16

14

13

5

6

7

8

COM4 NO4 CB2 NC3

NC1 CB1 NO2 COM2

13

V

CC

4

12 10 9

NO1

COM1

COM3

NO3

GND

NC2

MAX4910
MAX4912

2

11

NC4

THIN QFN

3 mm x 3 mm

TOP VIEW

+

Pin Configurations

General Description

The MAX4910/MAX4911/MAX4912 quad, single­pole/double-throw (SPDT), clickless audio switches fea­ture negative signal capability that allows signals as low
as VCC-5.5V to pass through without distortion. These
analog switches have a low on-resistance, low supply
current, and operate from a single +1.8V to +5.5V supply.

The MAX4910/MAX4911/MAX4912 have internal shunt
resistors that automatically discharge the capacitance at
the normally open (NO) and normally closed (NC) termi­nals when they are not connected. The MAX4910/
MAX4911 have shunt resistors on all NO and NC terminals
and the MAX4912 has shunt resistors on all NO, NC1, and
NC3 terminals. These shunt resistors reduce click-and­pop sounds that occur when switching audio signals
between precharged points. A break-before-make feature
further reduces popping.

The MAX4910/MAX4912 control the switches in pairs with
two control bits CB1 and CB2. The MAX4911 has one con­trol bit to switch all four switches and an enable pin EN to
put the switches in a high-impedance mode. The MAX4912
has two terminals without shunt resistors for switching
applications that do not require pre-discharge switching.

The MAX4910/MAX4911/MAX4912 are available in a tiny
16-pin TQFN-EP (3mm x 3mm) package and operate
over the -40°C to +85°C extended temperature range.

Applications

Cell Phones

PDAs and Handheld Devices

Notebook Computers

MP3 Players

Features

♦ Distortion-Free Negative Signal Throughput Down

to VCC- 5.5V

♦ Internal Shunt Resistors Reduce Click-and-Pop

Sounds

♦ High PSRR Reduces Supply Noise

♦ Low On-Resistance (0.37Ω)

♦ 0.1Ω Channel-to-Channel Matching

♦ 0.35Ω On-Resistance Flatness

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

♦ -80dB Crosstalk (20kHz)

♦ -90dB Off-Isolation (20kHz)

♦ 0.05% Total Harmonic Distortion

♦ Enable Control (MAX4911)

♦ 10nA Leakage Current

♦ 150nA Supply Current

Ordering Information

PA RT

T EM P R AN G E

PIN­PA CK A G E

T O P

PK G

C O DE

M A X4 9 1 0E TE+

T1633- 4

M A X4 9 1 1E TE+ *

T1633- 4

M A X4 9 1 2E TE+ *

T1633- 4

+ Denotes lead-free package.
*Future product—contact factory for availability.
**EP = Exposed pad.

Typical Operating Circuit appears at end of data sheet.

M A RK

- 40°C to + 85°C 16 TQFN- E P ** AD Y

- 40°C to + 85°C 16 TQFN- E P ** AD Z

- 40°C to + 85°C 16 TQFN- E P ** AE A

MAX4910/MAX4911/MAX4912

Quad-SPDT, Clickless Audio Switches
with Negative Signal Handling

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +5.5V, TA= -40°C to +85°C, EN = low (MAX4911 only), unless otherwise noted. Typical values are at VCC= +3.0V, TA=
+25°C.) (Note 1)

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.

(All voltages referenced to GND.)
V

CC

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

COM_, NC_, NO_ ...............................(V

CC

- 6V) to (VCC+ 0.3V)

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

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

50% duty cycle)..........................................................±400mA

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

10% duty cycle)..........................................................±500mA

Continuous Power Dissipation (T

A

= +70°C)
16-Pin TQFN, Single-Layer Board

(derate 15.6mW/°C above +70°C).............................1250mW

16-Pin TQFN, Multilayer Board

(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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

POWER SUPPLY

Supply Voltage V

CC

1.8 5.5 V

VCC = +5.5V, V

CB_

= VEN = 0V or V

CC

2

VCC = +2.7V, V

CB_

= VEN = +0.5V or +1.4V 4Supply Current I

CC

VCC = +5.5V, V

CB_

= VEN = +0.5V or +1.4V 8

µA

ANALOG SWITCH

Analog Signal Range

V

NC

_,

V

NO

_,

(Note 2)

V

CC

­V

TA = +25°C

C hannel s 1 and 3, V

C C

=

+ 3.3V , V

N C _

or V

N O_

= V

C C

-

5.5V , - 1V , 0V , + 1V , + 2V , V

C C

,

I

C OM 1

= I

C OM 3

= 100m A

T

A

= T

MIN

to T

MAX

0.8

Ω

TA = +25°C

On-Resistance
(Note 3)

R

ON

C hannel s 2 and 4, V

C C

=

+ 3.3V , V

N C _

or V

N O_

= V

C C

-

5.5V , - 1V , 0V , + 1V , + 2V , V

C C

,

I

C OM 2

= I

C OM 4

= 100m A

T

A

= T

MIN

to T

MAX

1.6

Ω

Channels 1 and 3, VCC = +3.3V, V

NC_

or V

NO_

= 0,

I

COM_

= 100mA

0.1

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

∆R

ON

Channels 2 and 4, VCC = +3.3V, V

NC_

or V

NO_

= 0,

I

COM_

= 100mA

0.1

Ω

C hannel s 1 and 3, V

C C

= +3.3V , V

N C _

= V

N O_

=

On-Resistance Flatness
(Note 5)

R

FLAT

C hannel s 2 and 4, V

C C

= +3.3V , V

N C _

= V

N O_

=

0.6

Ω

Shunt Switch Resistance R

SH

2 3.8 6 kΩ

0.15

V

COM

_,

V

- 5.5V , - 1V , 0V , + 1V , + 2V , V

C C

V

- 5.5V , - 1V , 0V , + 1V , + 2V , V

C C

C C

C C

, I

= 100m A

C OM _

, I

= 100m A

C OM _

5.5V

0.37 0.75

0.72 1.45

V

CC

0.35

MAX4910/MAX4911/MAX4912

Quad-SPDT, Clickless Audio Switches

with Negative Signal Handling

_______________________________________________________________________________________ 3

Note 1: All parameters are production tested at TA= +85°C and guaranteed by design over the specified temperature range.
Note 2: Signals on COM_, NO_, or NC_ exceeding V

CC

are clamped by internal diodes. Limit forward-diode current to maximum current

rating.

Note 3: Guaranteed by design; 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, VNO_ = input to off switch.

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.7V to +5.5V, TA= -40°C to +85°C, EN = low (MAX4911 only), unless otherwise noted. Typical values are at VCC= +3.0V, TA=
+25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

TA = +25°C

NC_ Off-Leakage Current

)

MAX4912 (NC2 and NC4)
only: V

CC

= +2.7V, switch

open, V

NC_

= -2.5V or

+2.5V, V

COM_

= +2.5V or

-2.5V

T

A

= T

MIN

to T

MAX

nA

TA = +25°C

COM_ On-Leakage Current

)

VCC = +2.7V, switch closed;
V

NC_

or V

NO_

= -2.5V,

+2.5V, or floating; V

COM_

=

-2.5V, +2.5V, or floating

T

A

= T

MIN

to T

MAX

nA

DYNAMIC CHARACTERISTICS

Turn-On Time t

ON

VCC = +2.7V, CB_ = low to high, RL = 50Ω,
C

L

= 5pF, V

NO_

= +1.5V, Figure 2

µs

Turn-Off Time t

OFF

VCC = +2.7V, CB_ = high to low, RL = 50Ω,
C

L

= 5pF, V

NO_

= +1.5V, Figure 2

0.3 1.0 µs

Break-Before-Make Delay
Time

t

D

V

C C

= + 2.7V , C B_ = l ow to hi g h or hi g h to l ow ,

125 ns

Charge Injection Q V

GEN_

= 0, R

GEN

= 0, CL = 1nF, Figure 4

pC

P ow er - S up p l y Rej ecti on Rati o

PSRR f = 20kHz, V

COM_

= 1V

RMS, RL

= 50Ω, CL = 5pF 60 dB

Off-Isolation V

ISO

f = 20kHz, V

COM_

= 1V

RMS

, RL = 50Ω, Figure 5

(Note 6)

dB

Crosstalk V

CT

f = 20kHz, V

COM_

= 1V

RMS

, RL = 50Ω, Figure 5

dB

Total Harmonic Distortion THD

f = 20Hz to 20kHz, V

COM_

= 0.5V

P-P

, RL = 50Ω,

DC bias = 0

%

NO_, NC_ Off-Capacitance

(

)

f = 1M H z, V

C OM _

= 0.5V

P - P ,

D C b i as = 0, Fi g ur e 6

pF

COM On-Capacitance

(ON)

f = 1M H z, V

C OM _

= 0.5V

P - P

, D C b i as = 0, Fi g ur e 6

pF

DIGITAL INPUTS (CB_, EN)

Input Logic High V

IH

1.4 V

Input Logic Low V

IL

0.5 V

Input Leakage Current

VCB_ = VEN = 0V or V

CC

-1 +1 µA

I

NC_(OFF

I

COM_(ON

RL = 50Ω , C L = 5p F, V

N C _

= V

CNO_

C

OFF

_

COM

ICB, I

EN

= + 1.5V , Fi g ur e 3

N O_

-10 +10

-50 +50

-10 +10

-100 +100

0.055 0.15

300

-90

-80

0.05

100

200

MAX4910/MAX4911/MAX4912

Quad-SPDT, Clickless Audio Switches
with Negative Signal Handling

4 _______________________________________________________________________________________

Typical Operating Characteristics

(V

CC

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

0

0.5

1.0

1.5

2.0

2.5

3.0

-4 -2-3 -1 012345

CHANNEL 1/3 ON-RESISTANCE

vs. COM 1/3 VOLTAGE

MAX4910/11/12 toc01

COM VOLTAGE (V)

ON-RESISTANCE (Ω)

VCC = 1.8V

VCC = 2.0V

VCC = 2.3V

VCC = 3.0V

VCC = 2.5V

VCC = 5.0V

0

1.0

0.5

2.0

1.5

3.0

2.5

3.5

4.5

4.0

5.0

-4 -2 -1 0-3 12345

CHANNEL 2/4 ON-RESISTANCE

vs. COM 2/4 VOLTAGE

MAX4910/11/12 toc02

COM VOLTAGE (V)

ON-RESISTANCE (Ω)

VCC = 1.8V

VCC = 2.0V

VCC = 2.3V

VCC = 3.0V

VCC = 2.5V

VCC = 5.0V

0

0.2

0.6

0.4

0.8

1.0

-3 -1-2 0 123

CHANNEL 1/3 ON-RESISTANCE

vs. COM 1/3 VOLTAGE

MAX4910/11/12 toc03

COM VOLTAGE (V)

ON-RESISTANCE (Ω)

TA = +85°C

TA = +25°C

TA = -40°C

0

0.4

0.2

0.8

0.6

1.0

1.2

-3 -1 0-2 123

CHANNEL 2/4 ON-RESISTANCE

vs. COM 2/4 VOLTAGE

MAX4910/11/12 toc04

COM VOLTAGE (V)

ON-RESISTANCE (Ω)

TA = +85°C

TA = +25°C

TA = -40°C

0.8

0.6

0.4

0.2

0

-1 201 34 5

CHANNEL 1/3 ON-RESISTANCE

vs. COM 1/3 VOLTAGE

MAX4910/11/12 toc05

COM VOLTAGE (V)

ON-RESISTANCE (Ω)

TA = +85°C

TA = +25°C

TA = -40°C

VCC = 5.0V

0.8

0.6

0.4

0.2

0

-1 201 34 5

CHANNEL 2/4 ON-RESISTANCE

vs. COM 2/4 VOLTAGE

MAX4910/11/12 toc06

COM VOLTAGE (V)

ON-RESISTANCE (Ω)

TA = +85°C

TA = +25°C

TA = -40°C

VCC = 5.0V

0

60

40

20

100

80

180

160

140

120

200

1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX4910/11/12 toc07

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (nA)

200

250

350

300

400

450

1.8 2.8 3.32.3 3.8 4.3 4.8 5.3

NC TURN-ON / NO TURN-OFF TIME

vs. SUPPLY VOLTAGE

MAX4910/11/12 toc08

SUPPLY VOLTAGE (V)

TURN-ON/TURN-OFF TIME (ns)

NC TURN-ON TIME

NO TURN-OFF TIME