Datas heet
AS1746
0 . 5 / 0 . 6
Ω,
L o w - Vo l ta g e , D u a l S P D T A n a l o g S w i t c h
1 General Description
The AS1746 is a low on-resistance (R
ON
), low-voltage,
dual-single-pole/double-throw (SPDT) analog switch
designed to operate from a single +1.8 to +5.5V supply.
The device features a 0.5Ω (max) R
ON
for normally
closed (NC) switches and a 0.6Ω (max) R
ON
for nor-
mally open (NO) switches using a +2.7V supply.
The AS1746 features break-before-make switching
(2ns) with t
ON
= 50ns and t
OFF
= 30ns (using a +2.7V
supply).
The digital logic inputs are 1.8V logic-compatible with
+2.7 to +3.3V supplies.
The AS1746 is available in a TDFN-10 (3x3mm) pack-
age and a WL-CSP-10 package.
2 Key Features
!
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Single Supply Operation: +1.8V to +5.5V
Normally Closed Switch R
ON
: 0.45Ω (+2.7V Supply)
Normally Open Switch R
ON
: 0.55Ω (+2.7V Supply)
R
ON
Matching Between Channels: 0.06Ω
R
ON
Flatness Over Signal Range: 0.15Ω
Supply Current: 50nA
Rail-to-Rail Signal Handling
1.8V Logic Compatibility
Low Crosstalk: -60dB (100kHz)
High Off-Isolation: -64dB (100kHz)
Total Harmonic Distortion: 0.025%
Ultra-Low Leakage Currents: 1nA (@ T
AMB
= +25ºC)
Package Types:
- TDFN-10 (3x3mm)
- WL-CSP-10
3 Applications
The device is ideal for audio headsets, MP3 players,
power routing switches, relay replacements, audio and
video signal routing, communications circuits, PCMCIA
cards, mobile phones, MODEMs, and any battery-oper-
ated equipment.
Figure 1. AS1746 - Block Diagram
AS1746
V+ 1
NO1 2
COM1 3
IN1 4
NC1 5
10 NO2
Truth Table
9 COM2
8 IN2
7 NC2
6 GND
IN
Low
High
NOx to
COM
Off
On
NCx to
COM
On
Off
Switch shown for logic low input.
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Revision 1.03
1 - 15
AS1746
Datasheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
GND
V+ 1
NO1 2
COM1 3
IN1 4
NC1 5
TDFN-10 (3x3mm)
10 NO2
9 COM2
IN1
C2
A2
IN2
NC1
C1
B1
A1
NC2
AS1746
8 IN2
7 NC2
6 GND
COM1
C3
AS1746
A3
COM2
NO1
C4
B4
V+
WL-CSP-10
A4
NO2
Pin Descriptions
Table 1. Pin Descriptions
Pin Number
Pin Name
V+
NO1
COM1
IN1
NC1
GND
NC2
IN2
COM2
NO2
Description
Positive Input Supply Voltage
Normally Open Analog Switch 1
Analog Switch 1 Common
Switch 1 Digital Input
Normally Closed Analog Switch 1
Ground
Normally Closed Analog Switch 2
Switch 2 Digital Input
Analog Switch 2 Common
Normally Open Analog Switch 2
See
Figure 2
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Revision 1.03
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AS1746
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in
Table 2
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
Electrical Character-
istics on page 4
is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Table 2. Absolute Maximum Ratings
Parameter
V+, INx to GND
COMx, NOx, NCx, to GND
COMx, NOx, NCx
Continuous Current
COMx, NOx, NCx
Peak Current
COMx, NOx, NCx
Peak Current
Continuous Power Dissipation
Electro-Static Discharge
Latchup Immunity
Operating Ambient
Temperature Range
Storage Temperature Range
-40
-65
2.5
250
+85
+150
Min
-0.3
-0.3
Max
+7
V+ +
0.3
+300
+400
+500
444
Units
V
V
COMx, NOx, NCx signals exceeding V+ or GND
are internally clamped by diodes and forward-
diode current must be limited to the maximum
current rating.
Comments
-300
-400
-500
mA
mA
mA
mW
kV
mA
ºC
ºC
The reflow peak soldering temperature (body
temperature) specified is in accordance with
IPC/JEDEC J-STD-020D “Moisture/Reflow
Sensitivity Classification for Non-Hermetic Solid
State Surface Mount Devices”.
The lead finish for Pb-free leaded packages is
matte tin (100% Sn).
Pulsed at 50% duty cycle
Pulsed at 10% duty cycle
T
AMB
= +70ºC
HBM Mil-Std883E 3015.7
methods
Class II, Level A
Package Body Temperature
+260
ºC
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Revision 1.03
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AS1746
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
(V+ = +2.7V to +3.3V, V
IH
= +1.4V, V
IL
= +0.5V, T
AMB
= -40°C to +85°C (unless otherwise specified). Typical values are
at +3V and +25°C.
Table 3. Electrical Characteristics
Symbol
Analog Switch
V
NOx
, V
NCx
,
V
COMx
Analog Signal Range
V+ = 2.7V, I
COMx
= 100mA,
V
NCx
= 0 to V+,
T
AMB
= 25°C
V+ = 2.7V, I
COMx
= 100mA,
V
NCx
= 0 to V+
V+ = 2.7V, I
COMx
= 100mA,
V
NOx
= 0 to V+,
T
AMB
= 25°C
V+ = 2.7V, I
COMx
= 100mA,
V
NOx
= 0 to V+
V+ = 2.7V, I
COMx
= 100mA,
V
NCx
/V
NOx
= 1.5V
V+ = 2.7V, I
COMx
= 100mA,
V
NCx
= 0 to V+
V+ = 2.7V, I
COMx
= 100mA,
V
NOx
= 0 to V+
V+ = 3.3V, V
NOx
/V
NCx
= 3V, 0.3V,
V
COMx
= 0.3V, 3V,
T
AMB
= 25°C
V+ = 3.3V, V
NOx
/V
NCx
= 3V, 0.3V,
V
COMx
= 0.3V, 3V
V+ = 3.3V, V
NOx
/V
NCx
= 3V, 0.3V or float,
V
COMx
= 3V, 0.3V, or float,
T
AMB
= 25°C
V+ = 3.3V, V
NOx
/V
NCx
= 3V, 0.3V or float,
V
COMx
= 3V, 0.3V, or float
V+ = 2.7V, V
NOx
/V
NCx
= 1.5V,
R
LOAD
= 50Ω, C
LOAD
= 35pF,
T
AMB
= 25°C
V+ = 2.7V, V
NOx
/V
NCx
= 1.5V,
R
LOAD
= 50Ω, C
LOAD
= 35pF
(see Figure 17 on page 10)
V+ = 2.7V, V
NOx
/V
NCx
= 1.5V,
R
LOAD
= 50Ω, C
LOAD
= 35pF,
T
AMB
= 25°C
V+ = 2.7V, V
NOx
/V
NCx
= 1.5V,
R
LOAD
= 50Ω, C
LOAD
= 35pF
(see Figure 17 on page 10)
V+ = 2.7V, V
NOx
/V
NCx
= 1.5V,
R
LOAD
= 50Ω, C
LOAD
= 35pF
(see Figure 18 on page 10)
COMx = 0, R
S
= 0, C
LOAD
= 1nF
(see
Figure 19 on page 10)
2
15
200
20
-1
-10
-2
-30
0.02
0.06
0.1
0.35
0
0.3
V+
0.45
Ω
0.5
0.55
Ω
0.6
0.06
0.15
0.35
1
10
2
30
Ω
Ω
Ω
nA
nA
nA
nA
V
Parameter
1
Condition
Min
Typ
Max
Unit
R
ON(NC)
NCx On-Resistance
R
ON(NO)
NOx On-Resistance
ΔR
ON
R
FLAT(NC)
R
FLAT(NO)
On-Resistance Match
2
Between Channels
NCx On-Resistance
3
Flatness
NOx On-Resistance
3
Flatness
NCx or NOx Off-
4
Leakage Current
I
NOxOFF
/
I
NCxOFF
I
COMxON
COMx On-Leakage
4
Current
Dynamic Characteristics
30
50
ns
60
t
ON
Turn On Time
5
30
ns
35
t
OFF
Turn Off Time
5
t
BBM
Q
Break-Before-Make
5
Delay
Charge Injection
ns
pC
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Revision 1.03
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AS1746
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 3. Electrical Characteristics (Continued)
Symbol
V
ISO
Parameter
Off-Isolation
1
Condition
V
COMx
= 1V
RMS
, R
LOAD
= 50Ω, C
LOAD
=
5pF, f = 100kHz
(see Figure 20 on page 11)
V
COMx
= 1V
RMS
, R
LOAD
= 50Ω, C
LOAD
=
5pF, f = 100kHz
(see Figure 20 on page 11)
R
LOAD
= 600Ω, INx
= 2V
P-P
,
f = 20Hz to 20kHz
f = 1MHz
(see Figure 21 on page 11)
f = 1MHz
(see Figure 21 on page 11)
f = 1MHz
(see Figure 21 on page 11)
f = 1MHz
(see Figure 21 on page 11)
Min
Typ
-64
Max
Unit
dB
6
V
XT
THD
C
NCXOFF
C
NOXOFF
C
NCXON
C
NOXON
Digital I/O
V
IH
V
IL
I
INx
Power Supply
V+
I+
Crosstalk
Total Harmonic
Distortion
NCx Off-Capacitance
NOx Off-Capacitance
NCx On-Capacitance
NOx On-Capacitance
Input Logic High
Input Logic Low
INx Input Leakage
Current
-60
0.025
84
37
190
150
1.4
0.5
dB
%
pF
pF
pF
pF
V
V
µA
V
INx
= 0 or V+
-1
1
Power Supply Range
V+ = 5.5V; V
IN
x = 0 or V+,
T
AMB
= 25°C
Supply Current
V+ = 5.5V; V
IN
x = 0 or V+
1.8
-50
-350
5.5
50
350
V
nA
1. The algebraic convention used in this data sheet is such that the most negative value is the minimum and the
most positive value is the maximum.
2.
ΔR
ON
= R
ON(MAX)
- R
ON(MIN)
between pins NC1 and NC2 or between pins NO1 and NO2.
3. Flatness is defined as the difference between the maximum and minimum value of R
ON
as measured over the
specified analog signal ranges.
4. 100% tested.
5. Guaranteed by design.
6. Off-isolation = 20
LOG10
(V
COM
/V
NO
), V
COM
= output, V
NO
= input to off switch.
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