MAX4850ETE+ - Maxim Integrated Products, Inc.

General Description

The MAX4850/MAX4850H/MAX4852/MAX4852H family

of dual SPDT (single-pole/double-throw) switches oper-

ate from a single +2V to +5.5V supply and can handle

signals greater than the supply rail. These switches fea-

ture low 3.5Ωor 3.5Ω/7Ωon-resistance with low on-

capacitance, making them ideal for switching audio

and data signals.

The MAX4850/MAX4850H are configured with two

SPDT switches and feature two comparators for head-

phone detection or mute/send key functions. The

MAX4852 has two SPDT switches with no comparators

for low 1µA supply current.

For over-rail applications, these devices offer either the

pass-through or high-impedance option. For the

MAX4850/MAX4852, the signal (up to 5.5V) passes

through the switch without distortion even when the posi-

tive supply rail is exceeded. For the MAX4850H/

MAX4852H, the switch input becomes high impedance

when the input signal exceeds the supply rail.

The MAX4850/MAX4850H/MAX4852/MAX4852H are

available in the space-saving (3mm x 3mm), 16-pin

TQFN package and operate over the extended temper-

ature range of -40°C to +85°C.

Applications

USB Switching

Audio-Signal Routing

Cellular Phones

Notebook Computers

PDAs and Other Handheld Devices

Features

♦USB 2.0 Full Speed (12MB) and USB 1.1 Signal

Switching Compliant

♦Switch Signals Greater than VCC

♦0.1ns Differential Skew

♦3.5Ω/7ΩOn-Resistance

♦135MHz -3dB Bandwidth

♦+2V to +5.5V Supply Range

♦1.8V Logic Compatible

♦Low Supply Current

1µA (MAX4852)

5µA (MAX4850)

10µA (MAX4850H/MAX4852H)

♦Available in a Space-Saving (3mm x 3mm),

16-Pin TQFN Package

MAX4850/MAX4850H/MAX4852/MAX4852H

Dual SPDT Analog Switches with

Over-Rail Signal Handling

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

VCC

MAX4850

MAX4850H

NC1

NO1

NC2

NO2

COUT2

COM1

IN1

IN2

COM2

CIN2

VCC

COUT1

CIN1

MAX4852

MAX4852H

NC1

NO1

NC2

NO2

COM1

IN1

IN2

COM2

MAX4850_

MAX4852_

IN_ NO_ NC_

0 OFF ON

1 ON OFF

SWITCHES SHOWN FOR

LOGIC 0 INPUT

3.5Ω

7Ω

3.5Ω

7Ω

Block Diagrams/Truth Table

19-3375; Rev 0; 7/04

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.

*EP = Exposed paddle.

PART TEMP RANGE PIN-PACKAGE TOP

MARK

MAX4850ETE -40°C to +85°C 16 TQFN-EP* ABU

MAX4850HETE -40°C to +85°C 16 TQFN-EP* ABV

MAX4852ETE -40°C to +85°C 16 TQFN-EP* ABZ

MAX4852HETE -40°C to +85°C 16 TQFN-EP* ACA

Pin Configurations and Selector Guide appear at end of

data sheet.

ABRIDGED DATA SHEET

Detailed Description

The MAX4850/MAX4850H/MAX4852/MAX4852H are low

on-resistance, low-voltage, analog switches that operate

from a +2V to +5.5V single supply and are fully specified

for nominal 3.0V applications. These devices feature

over-rail signal capability that allows signals up to 5.5V

with supply voltages down to 2.0V. These devices are

configured as dual SPDT switches.

These switches have low 50pF on-channel capacitance,

which allows for 12Mbps switching of the data signals for

USB 2.0 full speed/1.1 applications. The MAX485_ _ are

designed to switch D+ and D- USB signals with a guaran-

teed skew of less than 1ns (see Figure 1), as measured

from 50% of the input signal to 50% of the output signal.

The MAX4850_ feature a comparator that can be used

for headphone or mute detection. The comparator

threshold is internally generated to be approximately 1/3

of VCC.

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 VCC 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 con-

sumption. 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 volt-

age range (see Typical Operating Characteristics). The

switches are bidirectional, so NO_, NC_, and COM_

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_) goes

high. When CIN_ rises above VCC/3, COUT_ goes low.

The comparator threshold allows for detection of head-

phones 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 VCC before applying

analog signals, especially if the analog signal is not

current-limited.

MAX4850/MAX4850H/MAX4852/MAX4852H

Dual SPDT Analog Switches with

Over-Rail Signal Handling

______________________________________________________________________________________ 11

ABRIDGED DATA SHEET

MAX4850/MAX4850H/MAX4852/MAX4852H

Dual SPDT Analog Switches with

Over-Rail Signal Handling

12 ______________________________________________________________________________________

Test Circuits/Timing Diagrams

tR < 20ns

tF < 20ns

50%

LOGIC

INPUT

COM_

GND

IN_

CL INCLUDES FIXTURE AND STRAY CAPACITANCE.

VOUT = VNO ( RL )

RL + RON

VNO tOFF

NO_

0.9 x V0UT 0.9 x VOUT

tON

VOUT

SWITCH

OUTPUT

LOGIC

INPUT

IN DEPENDS ON SWITCH CONFIGURATION;

INPUT POLARITY DETERMINED BY SENSE OF SWITCH.

VCC

VOUT

MAX4850_

MAX4852_

VCC

SWITCH

INPUT

NORMAL MODE NORMAL MODE

HIGH-Z MODE

VCC + 0.5V

tHIZ

tHIZB

Figure 1. Switching Time

tskew_i

90%

50%

10%

90%

50%

10%

tfi

INPUT A

INPUT A-

tri

tskew_o

90%

50%

10%

90%

50%

10%

tfo

OUTPUT B

OUTPUT B-

tro

B-

A-

TxD+

TxD-

Rs = 39Ω

CL = 50pF

DELAY DUE TO SWITCH FOR RISING INPUT AND RISING OUTPUT SIGNALS.

DELAY DUE TO SWITCH FOR FALLING INPUT AND FALLING OUTPUT SIGNALS.

CHANGE IN SKEW THROUGH THE SWITCH FOR OUTPUT SIGNALS.

CHANGE IN SKEW THROUGH THE SWITCH FOR INPUT SIGNALS.

|tskew_i|

|tskew_o|

|tfo - tfi|

|tro - tri|

Figure 2. Input/Output Skew Timing Diagram

ABRIDGED DATA SHEET

MAX4850/MAX4850H/MAX4852/MAX4852H

Dual SPDT Analog Switches with

Over-Rail Signal Handling

______________________________________________________________________________________ 13

50%

VCC

LOGIC

INPUT

VOUT 0.9 x VOUT

tBBM

LOGIC

INPUT

GND

CL INCLUDES FIXTURE AND STRAY CAPACITANCE.

NO_

IN_

NC_ VOUT

VCC

VN_ COM_

MAX4850_

MAX4852_

Figure 3. Break-Before-Make Interval

VGEN GND

COM_

VOUT

VCC VOUT

OFF ON OFF

ΔVOUT

Q = (ΔVOUT)(CL)

NC_

LOGIC-INPUT WAVEFORMS INVERTED FOR SWITCHES

THAT HAVE THE OPPOSITE LOGIC SENSE.

OFF ON OFF

VIL TO VIH

VCC

RGEN

IN_

MAX4850_

MAX4852_

OR NO_

Figure 4. 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

VOUT

VCC

IN_

NC1

COM1

NO1*

VIN

MAX4850_

MAX4852_

OFF-ISOLATION = 20log VOUT

VIN

ON-LOSS = 20log VOUT

VIN

CROSSTALK = 20log VOUT

VIN

NETWORK

ANALYZER

50Ω

50Ω50Ω

50Ω

MEAS REF

10nF

0V OR VCC

50ΩGND

*FOR CROSSTALK THIS PIN IS NO2.

NC2 AND COM2 ARE OPEN.

Figure 5. On-Loss, Off-Isolation, and Crosstalk

ABRIDGED DATA SHEET

MAX4850/MAX4850H/MAX4852/MAX4852H

Dual SPDT Analog Switches with

Over-Rail Signal Handling

14 ______________________________________________________________________________________

CAPACITANCE

METER NC_ OR

NO_

COM_

GND

IN VIL OR VIH

10nF VCC

f = 1MHz

VCC

MAX4850_

MAX4852_

Figure 6. Channel Off-/On-Capacitance

MAX4850_

VCC

VTH + 100mV

VTH - 100mV

VOUT

tCOMP tCOMP

50%

tR < 20ns

tF < 20ns

VCC

GND

VCOUT_

CIN_

COUT_

VCIN_

NO_

VTH = VCC/3

COMPARATOR

INPUT (VCIN_)

COMPARATOR

OUTPUT (VCOUT_)

Figure 7. Comparator Switching Time

ABRIDGED DATA SHEET

MAX4850/MAX4850H/MAX4852/MAX4852H

Dual SPDT Analog Switches with

Over-Rail Signal Handling

______________________________________________________________________________________ 15

TOP VIEW

15 14 13

5678

NC1

IN1

VCC

COUT2

NO2

COUT1

COM2

IN2

CIN1

CIN2

COM1

NO1

GND

NC2

N.C.

MAX4850

MAX4850H

15 14 13

5678

NC1

IN1

VCC

N.C.

NO2

N.C.

COM2

IN2

N.C.

COM1

NO1

GND

NC2

N.C.

MAX4852

MAX4852H

THIN QFN THIN QFN

CONNECT EXPOSED PADDLE TO GROUND.

Pin Configurations

PART

RON

NC_/NO_

(Ω)

COMPARATORS OVER-RAIL

HANDLING

MAX4850 3.5/3.5 2

Input signal

passes through

the switch

MAX4850H 3.5/3.5 2 High-impedance

switch input

MAX4852 3.5/7 —

Input signal

passes through

the switch

MAX4852H 3.5/7 — High-impedance

switch input

Selector Guide

Chip Information

TRANSISTOR COUNT: 735

PROCESS: CMOS

DATA

SOURCE

AUDIO

SOURCE VCC

MUTE

BUTTON

VCC

MAX4850_

OUT+

OUT-

OUT+

OUT-

NC1

NO1

NC2

NO2

COUT

COM1

IN1

IN2

COM2

CIN

INPUT

SELECT

MUTE

Typical Operating Circuit

ABRIDGED DATA SHEET

MAX4850/MAX4850H/MAX4852/MAX4852H

Dual SPDT Analog Switches with

Over-Rail Signal Handling

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.

16 ____________________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 C0.08 C

0.10 M C A B

D/2

E/2

E2/2

(ND - 1) X e

(NE - 1) X e

D2/2

PACKAGE OUTLINE

21-0136

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

MARKING

AAAA

EXPOSED PAD VARIATIONS

CODES

PKG.

T1233-1

MIN.

0.95

NOM.

1.10

NOM.

1.10

MAX.

1.25

MIN.

0.95

MAX.

1.25

12N

0.25

0.20 REF

0.02

0.05

0.45

2.90

0.20

2.90

0.70

0.50 BSC.

0.55

3.00

0.65

3.10

0.25

3.00

0.75

0.30

3.10

0.80

0.20 REF

0.25 -

0.02

0.05

0.50 BSC.

0.30

2.90

0.40

3.00

0.20

2.90

0.70

0.25

3.00

0.75

3.10

0.50

0.80

3.10

0.30

PKG

REF. MIN.

12L 3x3

NOM. MAX. NOM.

16L 3x3

MIN. MAX.

0.35 x 45°

PIN ID JEDEC

WEED-1

T1233-3 1.10 1.25 0.95 1.10 0.35 x 45°1.25 WEED-10.95

T1633F-3 0.65

T1633-4 0.95

0.80 0.95 0.65 0.80

1.10 1.25 0.95 1.10

0.225 x 45°

0.95 WEED-2

0.35 x 45°

1.25 WEED-2

T1633-2 0.95 1.10 1.25 0.95 1.10 0.35 x 45°

1.25 WEED-2

PACKAGE OUTLINE

21-0136

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

WEED-11.25

1.100.95 0.35 x 45°

1.251.10

0.95

T1233-4

T1633FH-3 0.65 0.80 0.95 0.225 x 45°

0.65 0.80 0.95 WEED-2

NOTES:

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

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.

10. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY.

11. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY.

12. WARPAGE NOT TO EXCEED 0.10mm.

0.25 0.30 0.35

0.25

0.20 REF

0.02 0.05

0.35

0.55 0.75

2.90

2.90 3.00 3.10

0.65 BSC.

3.00 3.10

8L 3x3

MIN.

0.70 0.75 0.80

NOM. MAX.

TQ833-1 1.250.25 0.70 0.35 x 45°WEEC1.250.700.25

T1633-5 0.95 1.10 1.25 0.35 x 45°WEED-2

0.95 1.10 1.25

ABRIDGED DATA SHEET