Datasheet

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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.

COM4 NO4 EN NC3

NC1 CB NO2 COM2

12 10 9

NO1

COM1

COM3

NO3

GND

NC2

MAX4911

NC4

THIN QFN

3 mm x 3 mm

COM4 NO4 CB2 NC3

NC1 CB1 NO2 COM2

12 10 9

NO1

COM1

COM3

NO3

GND

NC2

MAX4910

MAX4912

NC4

THIN QFN

3 mm x 3 mm

TOP VIEW

Pin Configurations

General Description

The MAX4910/MAX4911/MAX4912 quad, single-

pole/double-throw (SPDT), clickless audio switches fea-

ture negative signal capability that allows signals as low

as V

-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) termi-

nals 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-and-

pop 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 con-

trol 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 V

- 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

PIN-

PA CK A G E

T O P

M A RK

PK G

C O DE

M A X4 9 1 0E TE+

- 40°C to + 85°C 16 TQFN- E P ** AD Y

T1633- 4

M A X4 9 1 1E TE+ *

- 40°C to + 85°C 16 TQFN- E P ** AD Z

T1633- 4

M A X4 9 1 2E TE+ *

- 40°C to + 85°C 16 TQFN- E P ** AE A

T1633- 4

+ Denotes lead-free package.

*Future product—contact factory for availability.

**EP = Exposed pad.

Typical Operating Circuit appears at end of data sheet.

Summary of content (13 pages)

PAGE 1
9-3854; Rev 0; 2/06 Quad-SPDT, Clickless Audio Switches with Negative Signal Handling Features 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.
PAGE 2
MAX4910/MAX4911/MAX4912 Quad-SPDT, Clickless Audio Switches with Negative Signal Handling ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) VCC, CB_, EN ........................................................-0.3V to +6.0V COM_, NC_, NO_ ...............................(VCC - 6V) to (VCC + 0.3V) Continuous Current NO_, NC_, COM_ ...........................±300mA Peak Current NO_, NC_, COM_ (pulsed at 1ms, 50% duty cycle)..........................................................
PAGE 3
Quad-SPDT, Clickless Audio Switches with Negative Signal Handling (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 NC_ Off-Leakage Current COM_ On-Leakage Current SYMBOL INC_(OFF) ICOM_(ON) CONDITIONS MAX4912 (NC2 and NC4) only: VCC = +2.7V, switch open, VNC_ = -2.5V or +2.5V, VCOM_ = +2.5V or -2.5V TA = +25°C MIN TYP -10 MAX UNITS +10 nA TA = TMIN to TMAX -50 +50 VCC = +2.
PAGE 4
Typical Operating Characteristics (VCC = 3.0V, TA = +25°C, unless otherwise noted.) CHANNEL 2/4 ON-RESISTANCE vs. COM 2/4 VOLTAGE 2.0 VCC = 2.0V 1.5 VCC = 2.5V 1.0 VCC = 2.3V VCC = 3.0V 4.0 3.5 3.0 VCC = 2.0V 2.5 VCC = 2.5V 2.0 VCC = 2.3V VCC = 3.0V 1.5 1.0 0.8 VCC = 5.0V 1.0 VCC = 5.0V 0.5 VCC = 1.8V MAX4910/11/12 toc03 4.5 MAX4910/11/12 toc02 5.0 ON-RESISTANCE (Ω) VCC = 1.8V 2.5 ON-RESISTANCE (Ω) MAX4910/11/12 toc01 3.0 CHANNEL 1/3 ON-RESISTANCE vs.
PAGE 5
Quad-SPDT, Clickless Audio Switches with Negative Signal Handling NO TURN-ON/NC TURN-OFF TIME vs. SUPPLY VOLTAGE NO TURN-ON/NC TURN-OFF TIME vs. TEMPERATURE 80 NO TURN-ON TIME 70 60 50 40 30 20 100 NO TURN-ON TIME 90 80 70 60 50 NC TURN-OFF TIME 40 30 20 10 NC TURN-OFF TIME 10 0 1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3 -40 -25 -10 5 SUPPLY VOLTAGE (V) 50 65 80 NC TURN-ON TIME 330 320 310 300 MAX4910/11/12 toc12 350 2.0 1.
PAGE 6
Typical Operating Characteristics (continued) (VCC = 3.0V, TA = +25°C, unless otherwise noted.) LEAKAGE CURRENT vs. TEMPERATURE FREQUENCY RESPONSE 3 ON-LOSS (dB) ICOM(ON) 6 100 ICOM(OFF) MAX4910/11/12 toc16 1000 MAX4910/11/12 toc15 LEAKAGE CURRENT (pA) 10,000 10 CHANNEL 2/4 0 CHANNEL 1/3 -3 1 -40 -15 10 35 60 -6 85 0.01 0.1 TEMPERATURE (°C) OFF-ISOLATION vs. FREQUENCY 100 CROSSTALK vs.
PAGE 7
Quad-SPDT, Clickless Audio Switches with Negative Signal Handling PIN MAX4910/ MAX4912 MAX4911 NAME FUNCTION 1 1 NC1 Analog Switch 1—Normally Closed Terminal 2 — CB1 Digital Control Input for Analog Switch 1 and Analog Switch 3 — 2 CB Digital Control Input for All Analog Switches 3 3 NO2 Analog Switch 2—Normally Open Terminal 4 4 COM2 5 5 NC2 Analog Switch 2—Normally Closed Terminal 6 6 GND Ground 7 7 NO3 Analog Switch 3—Normally Open Terminal 8 8 COM3 9 9 NC3 10 —
PAGE 8
Quad-SPDT, Clickless Audio Switches with Negative Signal Handling MAX4910/MAX4911/MAX4912 Functional Diagrams MAX4910 MAX4911 V CC NO1 MAX4912 V CC NO1 COM1 COM1 COM1 NC1 NC1 NC1 NO3 NO3 NO3 COM3 NC3 COM3 COM3 NC3 NC3 CB1 CB CONTROL LOGIC CB1 CONTROL LOGIC CONTROL LOGIC EN CB2 NC2 NC2 CB2 NC2 COM2 COM2 COM2 NO2 NO2 NO2 NC4 NC4 NC4 COM4 COM4 NO4 NO4 COM4 NO4 GND CB1 = 0, CB2 = 0. V CC NO1 GND EN = 0, CB = 0. GND CB1 = 0, CB2 = 0. DISCHARGE PATHS HAVE A 3.
PAGE 9
Quad-SPDT, Clickless Audio Switches with Negative Signal Handling NC1 V CC COM1 AMP NO1 SPEAKER 8Ω NC3 VOICE COM3 NO3 CODEC DISCHARGE CONTROL/ SIGNAL CONTROL CB1 (CB) CB2 (EN) NC2 COM2 MP3 NO2 CODEC NC4 COM4 NO4 MAX4910 MAX4911 MAX4912 GND ( ) IS FOR MAX4911 ONLY Figure 1. Typical Application Circuit Analog Signal Levels The MAX4910/MAX4911/MAX4912 on-resistance is channel dependant. Channels 1 and 3 have an onresistance of 0.37Ω (typ), and channels 2 and 4 have an on-resistance of 0.
PAGE 10
MAX4910/MAX4911/MAX4912 Quad-SPDT, Clickless Audio Switches with Negative Signal Handling Test Circuits/Timing Diagrams MAX4910 MAX4911 MAX4912 VCC V CC COM_ NO_ OR NC_ VNO_ LOGIC INPUT 50% 0V VOUT RL t OFF CL CB_ VOUT GND LOGIC INPUT t r < 5ns t f < 5ns VCC SWITCH OUTPUT 0.8 x V0UT 0.8 x VOUT 0V t ON CL INCLUDES FIXTURE AND STRAY CAPACITANCE. CB DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH. Figure 2.
PAGE 11
Quad-SPDT, Clickless Audio Switches with Negative Signal Handling +5V 10nF V OFF-ISOLATION = 20log OUT VIN NETWORK ANALYZER VCC 0V OR VCC NC_ MAX4910 MAX4911 MAX4912 VOUT NO_ GND 50Ω 50Ω VIN COM_ CB_ 50Ω MEAS 50Ω ON-LOSS = 20log REF VOUT VIN V CROSSTALK = 20log OUT VIN 50Ω MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINAL ON EACH SWITCH.
PAGE 12
MAX4910/MAX4911/MAX4912 Quad-SPDT, Clickless Audio Switches with Negative Signal Handling Typical Operating Circuit 1.8V TO 5.5V MELODY IC NC1 V CC COM1 AMP NO1 SPEAKER 8Ω NC3 VOICE COM3 NO3 CODEC DISCHARGE CONTROL/ SIGNAL CONTROL CB1 (CB) CB2 (EN) NC2 COM2 NO2 UART HEADPHONES OR UART NC4 COM4 NO4 MAX4910 MAX4911 MAX4912 GND ( ) IS FOR MAX4911 ONLY.
PAGE 13
Quad-SPDT, Clickless Audio Switches with Negative Signal Handling 12x16L QFN THIN.EPS (NE - 1) X e E MARKING E/2 D2/2 (ND - 1) X e AAAA D/2 e CL D D2 k CL b 0.10 M C A B E2/2 L E2 0.10 C CL 0.08 C CL A A2 A1 L L e e PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm G 21-0136 PKG 8L 3x3 12L 3x3 16L 3x3 A 0.70 0.75 0.80 0.70 0.75 b 0.25 0.30 0.35 0.20 D 2.90 3.00 2.90 E e 2.90 3.00 3.10 0.65 BSC. 2.90 3.00 3.10 0.50 BSC. 2.90 3.00 3.10 0.50 BSC. L 0.35 0.