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19-3377; Rev 0; 7/04
0.75, Dual SPDT Audio Switch with Integrated Comparators
General Description
The MAX4855 dual, single-pole/double-throw (SPDT) switch operates from a single +2V to +5.5V supply and features rail-to-rail signal handling. The MAX4855 has low on-resistance (0.75) with a +3V supply making it ideal for audio switching applications in portable devices. The device also integrates two internal comparators that can be used for headphone detection or mute/send key functions. The MAX4855 is available in the space-saving (3mm x 3mm), 16-pin thin QFN package and operates over the extended temperature range of -40C to +85C. Audio Signal Routing 0.75 On-Resistance 0.18 On-Resistance Flatness 0.07 Channel-to-Channel Matching Rail-to-Rail Signal Handling 2 Integrated Comparators 1.8V Logic Compatible 2V to 5.5V Supply Range Available in a Space-Saving (3mm x 3mm), 16-Pin TQFN Package
Features
MAX4855
Applications
Speaker Headset Switching Audio-Signal Routing Cellular Phones Notebook Computers PDAs and Other Handheld Devices
Ordering Information
PART MAX4855ETE TEMP RANGE -40C to +85C PINPACKAGE 16 TQFN-EP* TOP MARK ABY
*EP = Exposed paddle.
Block Diagram/Truth Table
MAX4855
Pin Configuration
NC1
0 0.75 COM1 IN1 IN2 0.75 COM2 1
OFF ON
ON OFF N.C. CIN1 CIN2 1 2
16
15
IN1
NC1
14
VCC
TOP VIEW
13
NO1
SWITCHES SHOWN FOR LOGIC 0 INPUT
COUT2 12 NO2 11 COUT1 10 COM2 9 IN2 8 N.C.
MAX4855
IN_
NO_
NC_
NC2
MAX4855
3 4 5 NO1 6 GND 7 NC2
NO2
VCC 3
COM1
COUT1 CIN1 VCC 3 COUT2 CIN2
THIN QFN
CONNECT EXPOSED PADDLE TO GROUND.
________________________________________________________________ Maxim Integrated Products
1
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0.75, Dual SPDT Audio Switch with Integrated Comparators MAX4855
ABSOLUTE MAXIMUM RATINGS
VCC, IN_, CIN_ to GND ..............................................-0.3V to +6.0V NO_, NC_, COM_, COUT_ (Note 1) ...............-0.3V to (VCC + 0.3V) COUT_ Continuous Current...................................................20mA Closed Switch Continuous Current COM_, NO_, NC_.......300mA Peak Current COM_, NO_, NC_ (pulsed at 1ms, 50% duty cycle) ....................................400mA Peak Current COM_, NO_, NC_ (pulsed at 1ms, 10% duty cycle) ....................................500mA Continuous Power Dissipation (TA = +70C) 16-Pin Thin QFN (derate 20.8mW/C above +70C) .....1667mW Operating Temperature Range................................-40C to +85C Junction Temperature ...........................................................+150C Storage Temperature Range .................................-65C to +150C Lead Temperature (soldering, 10s)......................................+300C
Note 1: Signals on NO, NC, or COM exceeding VCC or GND are clamped by internal diodes. Signals on IN exceeding GND are clamped by an internal diode. Limit forward-diode current to maximum current rating.
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.
ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +3.0V, TA = +25C, unless otherwise noted.) (Note 2)
PARAMETER Supply Voltage Supply Current ANALOG SWITCH Analog Signal Range VNO_, VNC_, VCOM_ RON VCC = 2.7V, ICOM_ = 100mA, VNC_ or VNO_ = 0V to VCC VCC = 2.7V, ICOM = 100mA, VNC_ or VNO_ = 1.5V VCC = 2.7V, ICOM_ = 100mA, VNC_ or VNO_ = 0.75V, 1.5V, 1.75V TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C -2 -10 -2 -15 0.18 0.075 0 VCC V SYMBOL VCC ICC VCC = 5.5V, VIN_ = 0V or VCC CONDITIONS MIN 2 5 TYP MAX 5.5 10 UNITS V A
0.75
1 1.1 0.120 0.135 0.275 0.3 +2 nA +10 +2 nA +15
On-Resistance (Note 3)
On-Resistance Match Between Channels (Notes 3, 4) On-Resistance Flatness (Note 5)
RON
RFLAT
NO_/NC_ Off-Leakage Current (Note 2)
IOFF
VCC = 5.5V, VNC_ or VNO_ = TA = +25C 1V or 4.5V, VCOM_ = 4.5V or TA = -40C to +85C 1V VCC = 5.5V; VNC_ or VNO_ = TA = +25C 1V, 4.5V, or floating; VCOM_ TA = -40C to +85C = 1V, 4.5V, or floating
COM_ On-Leakage Current (Note 2)
ION
DYNAMIC CHARACTERISTICS Turn-On Time tON VCC = 2.7V, VNO_ or VNC_ = TA = +25C 1.5V, RL = 300, CL = 50pF TA = -40C to +85C (Figure 1) 40 60 ns 100
2
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0.75, Dual SPDT Audio Switch with Integrated Comparators
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.7V to +5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +3.0V, TA = +25C, unless otherwise noted.) (Note 2)
PARAMETER Turn-Off Time SYMBOL tOFF CONDITIONS VCC = 2.7V, VNO_ or VNC_ = TA = +25C 1.5V, RL = 300, CL = 50pF TA = -40C to +85C (Figure 1) VCC = 2.7V, VNO_ or VNC_ = TA = +25C 1.5V, RL = 50, CL = 50pF TA = -40C to +85C (Figure 2) VCOM_ = 1.5V, RS = 0, CL = 1.0nF (Figure 3) f = 100kHz, VCOM_= 1VRMS, RL = 50, CL = 5pF (Figure 4) VCT BW THD COFF CON f = 100kHz, VCOM_= 1VRMS, RL = 50, CL = 5pF (Figure 4) Signal = 0dBm, RL = 50, CL = 5pF (Figure 4) f = 20Hz to 20kHz, VCOM_ = 1V + 2VP-P, RL = 32 f = 1MHz (Figure 5) f = 1MHz (Figure 5) VCC = 2V to 3.6V VCC = 3.6V to 5.5V VCC = 2V to 3.6V VCC = 3.6V to 5.5V VIN_ = 0 or 5.5V -0.5 0 VCC = 2V to 5.5V, falling input VCC = 2V to 5.5V ISOURCE = 1mA ISINK = 1mA Rising input (Figure 6) Falling input (Figure 6) 2.5 0.5 VCC 0.4V 0.4 0.3 x VCC 0.33 x VCC 50 1.4 1.8 0.5 0.8 +0.5 5.5 0.36 x VCC MIN TYP 30 MAX 40 ns 60 15 ns 2 170 -75 -93 38 0.07 50 150 pC dB dB MHz % pF pF UNITS
MAX4855
Break-Before-Make Time Delay (Note 3) Charge Injection Off-Isolation (Note 6) Crosstalk -3dB Bandwidth Total Harmonic Distortion NO_/NC_ OffCapacitance COM On-Capacitance DIGITAL I/O (IN_) Input-Logic High Voltage Input-Logic Low Voltage Input Leakage Current COMPARATOR Comparator Range Comparator Threshold Comparator Hysteresis Comparator Output High Voltage Comparator Output Low Voltage Comparator Switching Time
tD Q
VIH VIL IIN
V V A V V mV V V s
Note 2: Note 3: Note 4: Note 5: Note 6:
Specifications are 100% tested at TA = +85C only, and guaranteed by design and characterization over the specified temperature range. Guaranteed by design and characterization; not production tested. RON = RON(MAX) - RON(MIN). Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal ranges. Off-Isolation = 20log10 (VCOM_ / VNO_), VCOM_ = output, VNO_ = input to off switch. _______________________________________________________________________________________ 3
0.75, Dual SPDT Audio Switch with Integrated Comparators MAX4855
Typical Operating Characteristics
(VCC = 3.0V, TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. COM VOLTAGE
MAX4855 toc01
ON-RESISTANCE vs. COM VOLTAGE
MAX4855 toc02
ON-RESISTANCE vs. COM VOLTAGE
VCC = 5.0V
MAX4855 toc03
3.5 3.0 ON-RESISTANCE () 2.5 2.0 1.5 1.0 0.5 0 0 2 4 6 COM VOLTAGE (V) VCC = 2.0V VCC = 2.3V VCC = 2.5V VCC = 3.0V VCC = 5.0V VCC = 1.8V
1.0
VCC = 3.0V TA = +85C TA = +25C
1.0
0.8 ON-RESISTANCE ()
0.8 ON-RESISTANCE () TA = +85C 0.6 TA = +25C
0.6
0.4 TA = -40C 0.2
0.4
0.2
TA = -40C
0 0 0.5 1.0 1.5 2.0 2.5 3.0 COM VOLTAGE (V)
0 0 1 2 3 4 5 COM VOLTAGE (V)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4855 toc04
TURN-ON/TURN-OFF TIME vs. SUPPLY VOLTAGE
MAX4855 toc05
TURN-ON/TURN-OFF TIME vs. TEMPERATURE
36 TURN-ON/TURN-OFF TIME (ns) tON 34 32 30 28 tOFF 26 24 22
MAX4855 toc06
6 TA = -40C SUPPLY CURRENT (A) 5 TA = +25C 4
70 60 50 40 30 20 tOFF 10 tON
38
3
TA = +85C
TURN-ON/TURN-OFF TIME (ns)
2 1.5 2.5 3.5 4.5 5.5 SUPPLY VOLTAGE (V)
0 1.5 2.5 3.5 4.5 5.5 SUPPLY VOLTAGE (V)
-40
-15
10
35
60
85
TEMPERATURE (C)
LOGIC THRESHOLD vs. SUPPLY VOLTAGE
MAX4855 toc07
CHARGE INJECTION vs. COM VOLTAGE
180 160 CHARGE INJECTION (pC) 140 120 100 80 60 40 20 VCC = 3V VCC = 5V
MAX4855 toc08
LEAKAGE CURRENT vs. TEMPERATURE
MAX4855 toc09
1.6
200
0.8
LOGIC THRESHOLD (V)
VIN RISING 1.2
LEAKAGE CURRENT (nA)
1.4
0.6 COM ON-LEAKAGE 0.4
1.0 VIN FALLING 0.8
0.2
COM OFF-LEAKAGE
0.6 1.5 2.5 3.5 4.5 5.5 SUPPLY VOLTAGE (V)
0 0 1 2 3 4 5 COM VOLTAGE (V)
0 -40 -15 10 35 60 85 TEMPERATURE (C)
4
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0.75, Dual SPDT Audio Switch with Integrated Comparators MAX4855
Typical Operating Characteristics (continued)
(VCC = 3.0V, TA = +25C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION vs. FREQUENCY
MAX4855 toc10 MAX4855 toc11
FREQUENCY RESPONSE
20 0 -20 THD (%) -40 OFF-RESPONSE -60 -80 -100 0.1 1 10 100 FREQUENCY (MHz) CROSSTALK 0.1 ON-RESPONSE 1
FREQUENCY RESPONSE (dB)
RL = 32
RL = 600
0.01 10 100 1k FREQUENCY (Hz) 10k 100k
COMPARATOR THRESHOLD vs. TEMPERATURE
MAX4855 toc12
COMPARATOR THRESHOLD vs. TEMPERATURE
VCC = 5.0V COMPARATOR THRESHOLD (V) 1.725 1.700 1.675 1.650 1.625 1.600 VCMPI_ FALLING VCMPI_ RISING
MAX4855 toc13
1.10 VCC = 3.0V COMPARATOR THRESHOLD (V) 1.08 VCMPI_ RISING 1.06
1.750
1.04 VCMPI_ FALLING
1.02
1.00 -40 -15 10 35 60 85 TEMPERATURE (C)
-40
-15
10
35
60
85
TEMPERATURE (C)
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5
0.75, Dual SPDT Audio Switch with Integrated Comparators MAX4855
Pin Description
PIN 1, 8 2 3 4 5 6 7 9 10 11 12 13 14 15 16 EP NAME N.C. CIN1 CIN2 COM1 NO1 GND NC2 IN2 COM2 COUT1 NO2 COUT2 VCC IN1 NC1 -- No Connection. Not internally connected. Inverting Input for Comparator 1 Inverting Input for Comparator 2 Common Terminal for Analog Switch 1 Normally Open Terminal for Analog Switch 1 Ground Normally Closed Terminal for Analog Switch 2 Digital Control Input for Analog Switch 2. A logic LOW on IN2 connects COM2 to NC2 and a logic HIGH connects COM2 to NO2. Common Terminal for Analog Switch 2 Output for Comparator 1 Normally Open Terminal for Analog Switch 2 Output for Comparator 2 Supply Voltage. Bypass to GND with a 0.01F capacitor as close to the pin as possible. Digital Control Input for Analog Switch 1. A logic LOW on IN1 connects COM1 to NC1 and a logic HIGH connects COM1 to NO1. Normally Closed Terminal for Analog Switch 1 Exposed Paddle. Connect to PC board ground plane. FUNCTION
Detailed Description
The MAX4855 dual SPDT, low on-resistance, low-voltage, analog switch operates from a +2V to +5.5V supply and can handle signals up to the power rails. In addition, the MAX4855 integrates two internal comparators that can be used for headphone or mute detection. The comparator threshold is internally generated to be approximately 1/3 of VCC.
Analog Signal Levels
The on-resistance of these switches changes very little for analog input signals across the entire supply voltage range (see the Typical Operating Characteristics). The switches are bidirectional, so the NO_, NC_, and COM_ pins 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_) is high. When CIN_ rises above VCC/3, COUT_ is low. The comparator threshold allows for detection of headphones since headphone audio signals are typically biased to VCC/2.
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 consumption. 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).
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.
6
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0.75, Dual SPDT Audio Switch with Integrated Comparators
Test Circuits/Timing Diagrams
MAX4855
MAX4855
VCC V CC VNO NO_ COM_ VOUT RL IN_ CL SWITCH OUTPUT VOUT 0V t ON LOGIC INPUT VCC 50% 0V t OFF 0.9 x V0UT 0.9 x VOUT t R < 20ns t F < 20ns
LOGIC INPUT
GND
VOUT = VNO
CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL RL + RON
(
)
Figure 1. Switching Time
MAX4855
V CC V CC LOGIC INPUT COM_ RL IN_ VOUT
VCC 50% 0V
VN_
NC_ NO_
CL
LOGIC INPUT
GND VOUT tBBM CL INCLUDES FIXTURE AND STRAY CAPACITANCE. 0.9 x VOUT
Figure 2. Break-Before-Make Interval
_______________________________________________________________________________________
7
0.75, Dual SPDT Audio Switch with Integrated Comparators MAX4855
V CC
MAX4855
VCC RGEN NC_ OR NO_ GND IN_ OFF ON Q = (V OUT )(C L ) COM_ CL VOUT VOUT IN OFF ON
VOUT
OFF
V GEN
VIL TO VIH
IN
OFF
LOGIC-INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE.
Figure 3. Charge Injection
+5V 10nF NETWORK ANALYZER VCC 0V OR VCC IN_ COM1 VIN 50 50 V OFF-ISOLATION = 20log OUT VIN V ON-LOSS = 20log OUT VIN V CROSSTALK = 20log OUT VIN
MAX4855
NC1 50 GND NO1* VOUT MEAS REF
50
50
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.
*FOR CROSSTALK THIS PIN IS NO2. NC2 AND COM2 ARE OPEN.
Figure 4. On-Loss, Off-Isolation, and Crosstalk
10nF
V CC
VCC COM_
MAX4855
IN CAPACITANCE METER f = 1MHz NC_ OR NO_ GND
VIL OR VIH
Figure 5. Channel Off-/On-Capacitance 8 _______________________________________________________________________________________
0.75, Dual SPDT Audio Switch with Integrated Comparators MAX4855
MAX4855
VCC NO_ VCC 3 VCC COUT_ VCIN_ CIN_ GND VTH = VCC/3 COMPARATOR INPUT (VCIN_) VTH - 100mV VCOUT_ COMPARATOR OUTPUT (VCOUT_) 0V VOUT tCOMP
50%
VTH + 100mV
50%
tR < 20ns tF < 20ns
50%
tCOMP
50%
Figure 6. Comparator Switching Time
Typical Operating Circuit
TRANSISTOR COUNT: 735 PROCESS: CMOS
OUT+ NC1 AUDIO SOURCE 1 OUTNO1
Chip Information
MAX4855
COM1 IN1 INPUT SELECT
8 SPEAKER
NC2 OUT+ AUDIO SOURCE 2 MUTE COUT OUTNO2 VCC 3
IN2 COM2 VCC
CIN MUTE BUTTON
_______________________________________________________________________________________
9
0.75, Dual SPDT Audio Switch with Integrated Comparators MAX4855
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.)
D2 b
0.10 M C A B
D D/2
D2/2
E/2
E2/2
C L
E
(NE - 1) X e
E2
L e k (ND - 1) X e
C L
C L
0.10 C 0.08 C A A2 A1 L
C L
L
e
e
PACKAGE OUTLINE 12, 16L, THIN QFN, 3x3x0.8mm
21-0136
E
1 2
EXPOSED PAD VARIATIONS
DOWN BONDS ALLOWED
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.
PACKAGE OUTLINE 12, 16L, THIN QFN, 3x3x0.8mm
21-0136
E
2 2
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 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
12x16L QFN THIN.EPS

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