19-3581; Rev 0; 1/05
Low-Voltage, 0.31Ω, Quad-SPDT Analog Switch
General Description
The MAX4735 quad-SPDT switch routes audio signals
in portable applications. Each channel has a 0.31Ω typ-
ical on-resistance, allowing the MAX4735 to drive 8Ω
loudspeakers with less than 0.02% distortion.
The MAX4735 is configured as a quad-SPDT switch with
two common control inputs. Each digital input controls
two pairs of SPDT switches. The switches are fully bidi-
rectional, allowing both multiplexing and demultiplexing
operation. Break-before-make operation is guaranteed.
The device operates from a +1.6V to +3.6V supply and
over the extended -40°C to +85°C temperature range. It
is offered in both 16-pin 3mm x 3mm TQFN and TSSOP
packages.
♦
Low 0.31Ω R
ON
♦
0.06Ω On-Resistance Flatness
♦
Excellent 0.015Ω On-Resistance Matching
♦
Low 0.02% THD into 8Ω
♦
Low 0.015% THD into 32Ω
♦
Audio Signal Routing
♦
Space-Saving, 3mm x 3mm TQFN Package
♦
1.8V Logic Compatible
Features
MAX4735
Applications
Cell Phones
Digital Still Cameras
PDAs and Palmtop Devices
MP3 Players
PART
MAX4735ETE
MAX4735EUE
Ordering Information
PIN-PACKAGE
16 TQFN
16 TSSOP
TOP
MARK
ACT
—
PKG CODE
T1633-4
U16-2
Note:
All products specified across the -40°C to +85°C tem-
perature range.
Pin Configurations
TOP VIEW
NC1
NC4
Typical Application Circuit
V
CC
INA
16
COM1
NO1
NC2
COM2
1
2
3
4
5
NO2
15
14
13
12
11
COM4
NO4
NC3
COM3
RING TONE/
MELODY IC
MAX4735
MAX4735
10
9
AUDIO
CODEC
INTERNAL
8Ω
SPEAKER
6
GND
7
INB
8
NO3
EXTERNAL
8Ω OR 32Ω
SPEAKER
SYSTEM
CONTROLLER
TQFN
NOTE:
EXPOSED PADDLE CONNECTED TO GND.
Pin Configurations continued at end of data sheet.
V
CC
1.6V TO 3.6V
________________________________________________________________
Maxim Integrated Products
1
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.
Low-Voltage, 0.31Ω, Quad-SPDT Analog Switch
MAX4735
ABSOLUTE MAXIMUM RATINGS
V
CC
, INA, INB to GND ...........................................-0.3V to +4.0V
All Other Pins to GND (Note 1)...................-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 (derate 15.6mW/°C above +70°C) ............1.25W
16-Pin TSSOP (derate 9.4mW/°C above +70°C) ..........755mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
Signals on NO_, NC_, COM_ exceeding V
CC
or GND are clamped by internal diodes. IN_ is clamped to GND 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
(V
CC
= 2.7V to 3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= 3V, T
A
= +25°C.) (Note 2)
PARAMETER
POWER SUPPLY
Supply Voltage Range
Supply Current
ANALOG SWITCH
Analog Signal Range
NO_, NC_, COM_
V
CC
= 2.7V,
I
COM_
= 100mA,
V
NO_
or V
NC_
= 0 to V
CC
(Note 3)
V
CC
= 2.7V,
I
COM_
= 100mA,
V
NO_
or V
NC_
= 1.5V
(Notes 3, 4)
V
CC
= 2.7V;
I
COM_
= 100mA; V
NO_
or
V
NC_
= 0.6V, 1.2V, 1.8V
(Note 5)
V
CC
= 3.3V;
V
COM_
= 3V, 0.3V or
floating; V
NO_
or V
NC_
=
0.3V, 3V or floating
V
CC
= 3.3V;
V
NO_
or V
NC_
= 0.3V, 3V
or floating; V
COM_
= 0.3V,
3V or floating
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
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
20
100
20
100
0.06
0.015
0
0.31
V
CC
0.4
Ω
0.45
0.03
Ω
0.03
0.75
Ω
0.080
20
nA
100
20
nA
100
V
V
CC
I
CC
V
CC
= 3.6V, V
IN_
= 0 or V
CC
, NO_ = NC_ =
COM_ = floating
1.6
0.015
3.6
1
V
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
On-Resistance
R
ON
On-Resistance Match
∆R
ON
On-Resistance Flatness
R
FLAT
NO_ or NC_ Off-Leakage
Current
I
OFF
COM_ On-Leakage
Current
I
ON
2
_______________________________________________________________________________________
Low-Voltage, 0.31Ω, Quad-SPDT Analog Switch
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.7V to 3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= 3V, T
A
= +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4735
DYNAMIC CHARACTERISTICS
V
CC
= 2.7V,
V
NO_
or V
NC_
= 1.5V,
R
L
= 50Ω, C
L
= 35pF,
Figure 1
V
CC
= 2.7V,
V
NO_
or V
NC_
= 1.5V,
R
L
= 50Ω, C
L
= 35pF,
Figure 1
V
CC
= 2.7V,
V
NO_
or V
NC_
= 1.5V,
R
L
= 50Ω, C
L
= 35pF,
Figure 2 (Note 6)
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
2
2
100
20
-66
-86
0.02
70
250
-34
pC
MHz
dB
dB
%
pF
pF
dB
15
ns
20
40
200
ns
200
180
ns
180
Turn-On Time
t
ON
Turn-Off Time
t
OFF
Break-Before-Make Time
t
BBM
Charge Injection
On-Channel Bandwidth
-3dB
Off-Isolation
Crosstalk
Total Harmonic Distortion
Plus Noise
NC_ or NO_ Off-
Capacitance
COM_ On-Capacitance
Power-Supply Rejection
Ratio
DIGITAL INPUTS (INA,
Input-Logic High
Input-Logic Low
Input Leakage Current
Q
BW
V
ISO
V
CT
THD+N
C
NC_(OFF
),
C
NO_(OFF
)
C
COM_(ON)
PSRR
V
GEN
= 0V, R
GEN
= 0Ω, C
L
= 1nF, Figure 3
R
L
= 50Ω, Figure 4
V
COM_
= 1V
RMS
, R
L
= 50Ω, f = 100kHz,
C
L
= 5pF, Figure 4 (Note 7)
V
COM_
= 1V
RMS
, R
L
= 50Ω, f = 100kHz,
C
L
= 5pF, Figure 4 (Note 8)
f = 20Hz to 20kHz; V
NC_
, V
NO_
,
V
COM_
= 0.5V
P-P
; R
L
= 32Ω
f = 1MHz, V
NO
_ = V
NC
_ = V
COM_
= 1.5V,
Figure 5
f = 1MHz, V
NO
_ = V
NC
_ = V
COM_
= 1.5V,
Figure 5
V
AC
= 100mV
P-P
, V
COM_
= 1.5V, R
L
= 50Ω,
f = 100kHz
1.4
V
IH
V
IL
I
IN
V
IN_
= 0 or V
CC
V
0.5
±200
V
nA
Devices are 100% tested at T
A
= +85°C. Limits across the full temperature range are guaranteed by design and correlation.
R
ON
and R
ON
matching specifications are guaranteed by design for MAX4735ETE only.
∆R
ON
= R
ON(MAX)
- R
ON(MIN)
.
Flatness is defined as the difference between the maximum and minimum value of on-resistance, as measured over the
specified analog signal ranges.
Note 6:
Guaranteed by design, not production tested.
Note 7:
Off-isolation = 20log10 [V
COM_
/ (V
NO_
or V
NC_
)], V
COM_
= output, V
NO_
or V
NC_
= input to off switch.
Note 8:
Between any two switches.
Note 2:
Note 3:
Note 4:
Note 5:
_______________________________________________________________________________________
3
Low-Voltage, 0.31Ω, Quad-SPDT Analog Switch
MAX4735
Timing Circuits/Timing Diagrams
MAX4735
V
CC
V
CC
COM_
LOGIC
INPUT
V
OUT
R
L
IN_
LOGIC
INPUT
GND
SWITCH
OUTPUT
0V
C
L
V
OUT
0.9 x V
0UT
t
OFF
0.9 x V
OUT
V
CC
0V
50%
50%
V
N_
NO_
OR NC_
t
ON
C
L
INCLUDES FIXTURE AND STRAY CAPACITANCE.
R
L
V
OUT
= V
N_
R
L
+ R
ON
(
)
IN DEPENDS ON SWITCH CONFIGURATION;
INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
Figure 1. Switching Time
MAX4735
V
CC
V
CC
LOGIC
INPUT
COM_
R
L
GND
V
OUT
V
OUT
V
CC
50%
0V
V
N_
NC_
NO_
IN_
C
L
LOGIC
INPUT
0.9 x V
OUT
t
BBM
C
L
INCLUDES FIXTURE AND STRAY CAPACITANCE.
Figure 2. Break-Before-Make Interval
V
CC
MAX4735
V
CC
R
GEN
NC_
OR NO_
GND
IN_
OFF
ON
Q = (∆V
OUT
)(C
L
)
COM_
C
L
V
OUT
V
OUT
IN
OFF
V
CC
ON
∆V
OUT
OFF
V
GEN
V
IL
TO V
IH
IN
OFF
LOGIC-INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
Figure 3. Charge Injection
4
_______________________________________________________________________________________
Low-Voltage, 0.31Ω, Quad-SPDT Analog Switch
Timing Circuits/Timing Diagrams (continued)
V
CC
10nF
NETWORK
ANALYZER
0V OR V
CC
IN_
V
CC
COM1
V
IN
50Ω
50Ω
V
OFF-ISOLATION = 20log
✕
OUT
V
REF
V
ON-LOSS = 20log
✕
OUT
V
REF
CROSSTALK = 20log
✕
NO1*
GND
V
OUT
MEAS
REF
V
REF
V
OUT
V
REF
MAX4735
NC1
50Ω
MAX4735
50Ω
50Ω
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
V
CC
COM_
MAX4735
IN
CAPACITANCE
METER
f = 1MHz
V
IL
OR V
IH
NC_ or
NO_
GND
Figure 5. Channel On-/Off-Capacitance
_______________________________________________________________________________________
5
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