Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - analogue switches µDFN 10

General Description

The MAX4744/MAX4744H/MAX4745/MAX4745H/

MAX4746H dual SPDT (single-pole/double-throw) audio

switches feature negative signal capability that allows

signals as low as V

- 5.5V to pass through without

distortion. These analog switches have a low on-resis-

tance and low supply current, and operate from a single

+1.8V to +5.5V supply.

The MAX4744/MAX4744H have internal shunt resistors

that automatically discharge the capacitance at the nor-

mally open (NO) and normally closed (NC) terminals

when they are not connected. The MAX4746H features

internal shunt resistors on NC_ terminals. This reduces

click-and-pop sounds that occur when switching audio

signals between precharged points. A break-before-

make feature further reduces popping. The MAX4744/

MAX4745 control the switches with two control bits CB1

and CB2. The MAX4744H/MAX4745H/MAX4746H have

one control bit to switch both switches and an enable

input EN to put the switches in a high-impedance mode.

The MAX4744H/MAX4745H/MAX4746H also have an

internal protection network against voltages applied to

COM_ when V

= 0V.

These devices are available in a space-saving 10-pin

µDFN (2mm x 2mm) package and operate over the

-40°C to +85°C extended temperature range.

Applications

Speaker Switching

Power Routing

Cellular Phones

MP3 Players

PDAs and Other Handheld Devices

Notebook Computers

Features

 Distortion-Free Negative Signal Throughput Down

to V

- 5.5V

 Internal Shunt Resistor Reduces Click/Pop

(MAX4744/MAX4744H)

 0.6Ω (typ) Low On-Resistance

 0.1Ω (max) Channel-to-Channel Matching

 0.55Ω (max) On-Resistance Flatness

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

 0.01% (typ) Total Harmonic Distortion

 -75dB (typ) Crosstalk (100kHz)

 -68dB (typ) Off-Isolation (100kHz)

 Available in 10-Pin µDFN Package (2mm x 2mm)

MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H

Low-Voltage, Dual SPDT, Audio Clickless

Switches with Negative Rail Capability

________________________________________________________________

Maxim Integrated Products

19-0563; Rev 1; 11/06

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.

123

10 9 8

COM1 V

COM2NC1

CB1 CB2GNDNO1

MAX4744

MAX4745

μDFN

(2mm x 2mm)

TOP VIEW

NC2

NO2

123

10 9 8

COM1 V

COM2NC1

EN CB0GNDNO1

MAX4744H

MAX4745H

MAX4746H

μDFN

(2mm x 2mm)

NC2

NO2

Pin Configurations

Ordering Information/Selector Guide

PART

PIN-

PACKAGE

TOP

MARK

CLICKLESS COM PROTECTION PKG CODE

MAX4744ELB+T 10 µDFN-10 +AAF Yes No L1022-1

MAX4744HELB+T 10 µDFN-10 +AAG Yes Yes L1022-1

MAX4745ELB+T 10 µDFN-10 +AAH No No L1022-1

MAX4745HELB+T 10 µDFN-10 +AAI No Yes L1022-1

MAX4746HELB+T 10 µDFN-10 +AAM Yes, on NC_ Yes L1022-1

Note: All devices are specified over the -40°C to +85°C operating temperature range.

Denotes a lead-free package.

Summary of content (12 pages)

PAGE 1
9-0563; Rev 1; 11/06 Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability Features The MAX4744/MAX4744H/MAX4745/MAX4745H/ MAX4746H dual SPDT (single-pole/double-throw) 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 and low supply current, and operate from a single +1.8V to +5.5V supply.
PAGE 2
MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) VCC, CB_, EN ........................................................-0.3V to +6.0V NC_, NO_ ...........................................(VCC - 6V) to (VCC + 0.3V) COM_ (MAX4744/MAX4745).............(VCC - 6V) to (VCC + 0.3V) COM_ (MAX4744H/MAX4745H/MAX4746H) ..................(Note 1) Continuous Current NO_, NC_, COM_. .........
PAGE 3
Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.7V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25°C.) (Note 2) PARAMETER COM_ Leakage Under Protection Conditions SYMBOL IL(PROT) CONDITIONS VCC = 0V; VCOM_ = +5.
PAGE 4
ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.7V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 0.5 V +1 µA DIGITAL INPUTS (CB_, EN) Input-Logic High VIH Input-Logic Low VIL Input Leakage Current 1.4 ILEAK VCB_ or VEN = 0V or VCC V -1 Note 2: All parameters are production tested at TA = +25°C and guaranteed by design over the specified temperature range.
PAGE 5
Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability NO_ TURN-ON/NC_ TURN-OFF TIME vs. TEMPERATURE NO_ TURN-ON/NC_ TURN-OFF TIME vs. SUPPLY VOLTAGE 120 TIME (ns) TIME (ns) 100 600 NC_ TURN-ON TIME 500 80 NO_ TURN-ON TIME 60 NC_ TURN-OFF TIME 400 40 240 MAX4744 toc06 700 MAX4744 toc05 140 MAX4744 toc04 800 NO_ tON TURN-ON/TURN-OFF TIME (ns) NC_ TURN-ON/NO_ TURN-OFF TIME vs. SUPPLY VOLTAGE 200 160 120 NC_ tOFF 80 40 NO_ TURN-OFF TIME 0 20 2.8 3.8 5.5 4.8 1.
PAGE 6
Typical Operating Characteristics (continued) (VCC = +3.3V, TA = +25°C, unless otherwise noted.) LEAKAGE CURRENT vs. TEMPERATURE FREQUENCY RESPONSE MAX4744 toc13 MAX4744 toc12 0 -1 100 ON ON-LOSS (dB) LEAKAGE CURRENT (nA) 1000 10 -2 -3 -4 OFF 1.0 -5 0.1 -40 -15 10 35 60 -6 0.001 85 0.01 TEMPERATURE (°C) OFF-ISOLATION vs. FREQUENCY 1 10 100 CROSSTALK vs. FREQUENCY -20 CROSSTALK (dB) -50 -60 MAX4744 toc15 0 MAX4744 toc14 -40 OFF-ISOLATION (dB) 0.
PAGE 7
Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability PIN MAX4744/ MAX4745 MAX4744H/ MAX4745H/ MAX4746H NAME 1 — CB1 Digital Control Input for Analog Switch 1 EN Enable Input. Driving EN high causes all switches to be high impedance. Pull EN low for normal operation.
PAGE 8
MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability VCC MAX4744 MAX4744H NC1 NC1 COM1 SWITCH 1 VCC SWITCH 1 COM1 HIGH-Z NO1 NO1 SHUNT SWITCH CONTROL LOGIC SHUNT SWITCH CB1 CB2 NC2 EN CB0 NC2 SWITCH 2 HIGH-Z COM2 NO2 GND MAX4745 NC1 SWITCH 1 COM1 COM1 HIGH-Z NO1 GND VCC MAX4745H VCC NC1 SWITCH 1 COM2 SWITCH 2 NO2 NO1 CONTROL LOGIC CB1 CB2 EN CB0 NC2 NC2 SWITCH 2 HIGH-Z COM2 NO2 NO2 GND MAX4746
PAGE 9
Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability MAX4744/MAX4745/ MAX4744H/MAX4745H/ MAX4746H VCC V CC COM_ NO_ OR NC_ VNC_ OR VNO_ LOGIC INPUT 50% 0V VOUT RL t OFF CL CB_ VOUT GND LOGIC INPUT SWITCH OUTPUT 0.8 x V0UT 0V 0.2 x VOUT t ON CL INCLUDES FIXTURE AND STRAY CAPACITANCE RL VOUT = VN_ RL + RON ( t r < 5ns t f < 5ns VCC IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH. ) Figure 2.
PAGE 10
MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability Test Circuits/Timing Diagrams V CC MAX4744/MAX4745/ MAX4744H/MAX4745H/ MAX4746H ΔVOUT VCC COM_ VOUT NC_ OR NO_ VOUT CB_ OFF CL GND ON OFF CB_ VIL TO VIH ON OFF CB_ OFF Q = (ΔV OUT )(C L ) LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE. Figure 4.
PAGE 11
Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability 10nF MAX4744 COM_ CAPACITANCE ANALYZER MAX4744 MAX4744H MAX4745 MAX4745H MAX4746H NC1 MAXIM DirectDrive™ AUDIO AMP CB_ COM1 NO1 VIL OR VIH NC_ OR NO_ f = 1MHz GND CB1 SHUNT SWITCH CB2 Figure 6.
PAGE 12
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.) A D XXXX XXXX XXXX b e 6, 8, 10L UDFN.EPS MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability N SOLDER MASK COVERAGE E PIN 1 0.