19-0558; Rev 1; 11/07
Quad SPDT Audio Switches
General Description
The MAX4740/MAX4740H low on-resistance (0.61Ω
typ) analog switches operate from a single 1.6V to 5.5V
supply. The MAX4740/MAX4740H are quad, single-
pole, double-throw (SPDT) switches and are configured
to route audio signals. The MAX4740/MAX4740H are
pin-to-pin compatible parts with the ST Microelectronics
quad SPDT STG3699 analog switch.
The MAX4740 is a quad SPDT switch and the
MAX4740H is a quad SPDT switch that can be placed
in a high-impedance mode. Switching logic is con-
trolled by 2 control bits (CB1 and CB2). The MAX4740/
MAX4740H also feature a low on-resistance match
(0.06Ω) and low power-supply current (0.3µA), which
increases battery life.
The MAX4740/MAX4740H are available in a tiny 3mm x
3mm, 16-pin TQFN-EP, and 2.5mm x 2.5mm, 16-pin ultra-
thin QFN packages.
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Features
Low On-Resistance (0.61Ω typ)
0.06Ω (typ) Channel-to-Channel Matching
0.32Ω (typ) On-Resistance Flatness
1.6V to 5.5V Single-Supply Voltage
High PSRR Reduces Supply Noise (-60dB typ)
0.08% Total Harmonic Distortion
-68dB typ Crosstalk (100kHz)
-64dB typ Off-Isolation (100kHz)
Low Supply Current (0.3µA typ)
Low Leakage Current (0.1µA typ)
Pin-to-Pin Compatible with ST Micro STG3699
(3mm x 3mm) 16-Pin TQFN, and (2.5mm x 2.5mm)
16-Pin Ultra-Thin QFN Packages
MAX4740/MAX4740H
Ordering Information
PART
MAX4740ETE+
MAX4740EVE+
MAX4740HETE+
MAX4740HEVE+
PIN-PACKAGE
16 TQFN-EP
(3mm x 3mm)
16 Ultra-Thin QFN
(2.5mm x 2.5mm)
16 TQFN-EP
(3mm x 3mm)
16 Ultra-Thin QFN
(2.5mm x 2.5mm)
TOP
MARK
AEV
+AAA
AEW
+AAB
PKG
CODE
T1633-4
V162A2-1
T1633-4
V162A2-1
Applications
Voice Switching
Cellular Phones
PDAs and other Handheld Devices
MP3 Player
Notebook Computers
Typical Operating Circuit
1.6V to 5.5V
V
CC
NO1
Note:
All devices are guaranteed over the -40°C to +85°C
temperature range.
EP = Exposed pad.
Pin Configuration
COM4
COM1
NO4
BASEBAND
(SPEECH)
NC1
INTERNAL
SPEAKER
COM2
NC2
CB1
CB2
NO3
COM3
NC3
BLOCKING CAPS
EXTERNAL
HEADPHONES
NO2
12
11
10
NC4
CONTROL
LOGIC
13
14
15
16
+
NC3
9
CB2
TOP VIEW
8
7
COM3
NO3
GND
NC2
V
CC
NO1
COM1
MAX4740
MAX4740H
*EP
6
5
NO4
COM4
MIDI
(RINGER)
NC4
GND
EXTERNAL
HEADPHONES
1
NC1
2
CB1
3
NO2
4
COM2
MAX4740
3mm x 3mm Thin QFN/
2.5mm x 2.5mm Ultra-Thin QFN
*CONNECT EP TO GND OR LEAVE EP UNCONNECTED.
________________________________________________________________
Maxim Integrated Products
1
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.
Quad SPDT Audio Switches
MAX4740/MAX4740H
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
V
CC
, CB_ ...............................................................-0.3V to +6.0V
COM_, NC_, NO_ .......................................-0.3V to (V
CC
+ 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 (3mm x 3mm), Single-Layer Board
(derate 15.6mW/°C above +70°C) ..............................1250mW
16-Pin TQFN (3mm x 3mm), Multilayer Board (derate
20.8mW/°C above +70°C) ..........................................1667mW
16-Pin Ultra-Thin QFN (2.5mm x 2.5mm), MultiLayer
Board (derate 11.5mW/°C above +70°C) .................923.8mW
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
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
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C, V
CC
= +3.3V.) (Note 1)
PARAMETER
POWER SUPPLY
Supply Voltage Range
Supply Current
ANALOG SWITCH
Analog Signal Range
V
NC
_,
V
NO
_,
V
COM
_,
(Note 2)
T
A
= +25°C
T
A
= T
MIN
to
T
MAX
T
A
= +25°C
T
A
= T
MIN
to
T
MAX
T
A
= +25°C
T
A
= T
MIN
to
T
MAX
-1
0.1
0.32
0.06
0.1
0.72
0.87
+1
Ω
Ω
0
0.61
V
CC
0.90
1
Ω
V
V
CC
V
CC
= +5.5V, V
CB
_ = 0V or V
CC
I
CC
V
CC
= +5.5V, V
CB
_ = 0.5V or +1.6V
V
CC
= +2.5V, V
CB
_ = 0.5V or +1.4V
1.6
0.3
0.3
0.1
5.5
1
5
µA
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
On-Resistance
R
ON
V
CC
= 3.3V, I
COM_
=
100mA; CB_ = low or
high
V
CC
= 3.3V, V
NC
_ or
V
NO
_ = 0.875V; I
COM_
=
100mA (Note 3)
V
CC
= 3.3V, V
COM_
= 0
to V
CC
; I
COM_
= 100mA
(Note 4)
On-Resistance Match Between
Channels
ΔR
ON
On-Resistance Flatness
R
FLAT(NO)
I
NO
_
(OFF),
I
NC_(OFF)
I
COM
_
(ON)
NO_, NC_ Off-Leakage Current
V
CC
= 5.5V; V
NC
_ or V
NO
_ = 0.3V, 5.5V;
V
COM
_ = 5.5V or 0.3V
V
CC
= 5.5V, V
NC
_ or V
NO
_ = 0.3V, 5.5V, or
unconnected; V
COM
_ = 0.3V, 5.5V, or
unconnected
µA
COM_ On-Leakage Current
-1
0.1
+1
µA
2
_______________________________________________________________________________________
Quad SPDT Audio Switches
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C, V
CC
= 3.3V.) (Note 1)
PARAMETER
DYNAMIC CHARACTERISTICS
Turn-On Time
Turn-Off Time
Charge Injection
Off-Isolation
Crosstalk
Power-Supply Rejection Ratio
Total Harmonic Distortion
NO_, NC_ Off-Capacitance
COM_ On-Capacitance
DIGITAL INPUTS (CB_)
Input Logic-High
Input Logic-Low
Input Leakage Current
V
IH
V
IL
I
IN
-1
0.1
V
CC
= 1.6V to 2.7V
V
CC
= 2.7V to 5.5V
1.4
1.6
0.5
+1
V
V
µA
t
ON
t
OFF
Q
V
ISO
V
CT
PSRR
THD
R
L
= 32Ω, C
L
=
35pF, Figure 2
R
L
= 32Ω, C
L
=
35pF, Figure 2
For NO_, V
NO_
= 1V
For NC_, V
NC_
= 1V
For NO_, V
NO_
= 1V
For NC_, V
NC_
= 1V
70
210
210
55
200
-64
-68
-60
0.08
40
150
ns
ns
pC
dB
dB
dB
%
pF
pF
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4740/MAX4740H
V
GEN
_ = 0V; R
GEN
= 0Ω; C
L
= 1nF;
Figure 3
C
L
= 5pF; R
L
= 32Ω; f = 100kHz;
V
COM
_ = 1V
RMS
; Figure 4 (Note 5)
C
L
= 5pF; R
L
= 32Ω; f = 100kHz;
V
COM
_ = 1V
RMS
; Figure 4
f = 20kHz, V
COM_
= 1V
RMS,
R
L
= 50Ω,
C
L
= 5pF
f = 20Hz to 20kHz, V
P-P
= 0.5V, R
L
= 32Ω
C
NC_(OFF)
,
f = 1MHz, Figure 5
C
NO
_
(OFF)
C
COM
_
(ON)
f = 1MHz, Figure 5
Note 1:
For TQFN (3mm x 3mm) electrical specifications are production tested at T
A
= +85°C and guaranteed by design at T
A
= +25°C
and -40°C. For Ultra-Thin QFN (2.5mm x 2.5mm) electrical specifications are production tested at T
A
= +25°C and guaranteed by
design at T
A
= +85°C and -40°C.
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:
ΔR
ON
= R
ON(MAX)
- R
ON(MIN)
.
Note 4:
Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the
specified analog signal ranges.
Note 5:
Off-isolation = 20log10 [V
COM_
/ V
NO_
], V
COM_
= output, V
NO_
= input to off switch.
_______________________________________________________________________________________
3
Quad SPDT Audio Switches
MAX4740/MAX4740H
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25°C, unless otherwise noted)
ON-RESISTANCE
vs. COM VOLTAGE
MAX4740/40H toc01
ON-RESISTANCE
vs. COM VOLTAGE
V
CC
= 5V
0.5
ON-RESISTANCE (Ω)
MAX4740/40H toc02
NC TURN-ON/NO TURN-OFF TIME
vs. SUPPLY VOLTAGE
MAX4740/40H toc03
0.7
V
CC
= 3V
0.6
ON-RESISTANCE (Ω)
T
A
= +85°C
0.5
T
A
= +25°C
0.4
T
A
= -40°C
0.3
0.6
600
TIME (ns)
0.4
T
A
= +85°C
0.3
400
NC TURN-ON TIME
200
0.2
T
A
= -40°C
T
A
= +25°C
0
0
1
2
3
4
5
1.8
2.3
2.8
3.3
3.8
4.3
4.8
5.3
COM VOLTAGE (V)
SUPPLY VOLTAGE (V)
NO TURN-OFF TIME
0.2
0
0.5
1.0
1.5
2.0
2.5
3.0
COM VOLTAGE (V)
0.1
NO TURN-ON/NC TURN-OFF TIME
vs. SUPPLY VOLTAGE
MAX4740/40H toc04
NO TURN-ON/NC TURN-OFF TIME
vs. TEMPERATURE
MAX4740/40H toc05
NC TURN-ON/NO TURN-OFF TIME
vs. TEMPERATURE
V
CC
= 3V
TURN-ON/TURN-OFF TIME (ns)
400
MAX4740/40H toc06
180
160
TURN-ON/TURN-OFF TIME (ns)
140
120
100
80
60
40
20
1.8
2.3
2.8
3.3
3.8
4.3
4.8
5.3
SUPPLY VOLTAGE (V)
NC TURN-OFF TIME
NO TURN-ON TIME
100
V
CC
= 3V
TURN-ON/TURN-OFF TIME (ns)
80
NO t
ON
500
60
300
NC t
ON
40
NC t
OFF
200
NO t
OFF
20
-40
-15
10
35
60
85
TEMPERATURE (°C)
100
-40
-15
10
35
60
85
TEMPERATURE (°C)
LOGIC THRESHOLD
vs. SUPPLY VOLTAGE
MAX4740/40H toc07
SUPPLY CURRENT
vs. LOGIC INPUT VOLTAGE
MAX4740/40H toc08
CHARGE INJECTION
vs. COM VOLTAGE
MAX4740/40H toc09
2.0
V
CB
RISING
100
90
80
SUPPLY CURRENT (nA)
70
60
50
40
30
20
10
V
CC
=
3V
V
CC
=
2.5V
V
CC
= 3V
250
CHARGE INJECTION ( pC)
1.6
LOGIC THRESHOLD (V)
200
V
CC
= 5.0V
150
V
CC
= 2.0V
1.2
V
CB
FALLING
0.8
100
0.4
V
CC
= 2.5V
50
0
1.8
2.3
2.8
3.3
3.8
4.3
4.8
5.3
SUPPLY VOLTAGE (V)
0
0
0.5
1.0
1.4
1.5
2.0
2.5
3.0
LOGIC INPUT VOLTAGE (V)
0
0
1
2
3
4
5
V
COM
(V)
4
_______________________________________________________________________________________
Quad SPDT Audio Switches
Typical Operating Characteristics (continued)
(V
CC
= 3.3V, T
A
= +25°C, unless otherwise noted)
LEAKAGE CURRENT
vs. TEMPERATURE
MAX4740/40H toc10
MAX4740/MAX4740H
FREQUENCY RESPONSE
MAX4740/40H toc11
100,000
10,000
LEAKAGE CURRENT (pA)
1000
100
10
1
0.1
-40
-15
10
35
60
I
COM(OFF)
0
I
COM(ON)
ON-LOSS (dB)
-2
-4
-6
85
0.01
0.1
1
FREQUENCY (MHz)
10
100
TEMPERATURE (°C)
OFF-ISOLATION vs. FREQUENCY
MAX4740/40H toc12
CROSSTALK vs. FREQUENCY
MAX4740/40H toc13
0
0
OFF-ISOLATION (dB)
-20
-20
CROSSTALK (dB)
-40
-40
-60
-60
-80
0.001
0.01
0.1
FREQUENCY (MHz)
1
10
-80
0.001
0.01
0.1
FREQUENCY (MHz)
1
10
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
MAX4740/40H toc14
POWER-SUPPLY REJECTION
RATIO vs. FREQUENCY
MAX4740/40H toc15
1
R
L
= 32Ω
70
60
50
PSRR (dB)
40
30
20
10
THD (%)
0.1
0.01
10
100
1k
FREQUENCY (Hz)
10k
100k
0
0.001
0.01
0.1
FREQUENCY (MHz)
1
10
_______________________________________________________________________________________
5
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