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PDF AS1748 Data sheet ( Hoja de datos )
| Número de pieza | AS1748 | |
| Descripción | Audio Clickless Switches | |
| Fabricantes | austriamicrosystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS1748 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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Datasheet
AS1747, AS1748, AS1749, AS1750
L o w - Vo l ta g e , D u a l S P D T, Au d i o C l i c k l e s s S w i t c h e s w i t h
Negative Rail Capability
1 General Description
2 Key Features
The SPDT (single-pole/double-throw) switches AS1747,
AS1748, AS1749 and AS1750 allow signals below
ground to pass through without distortion. These analog
switches are ideal for switching audio signals, due to
their supply voltage from +1.8V to +5.5V and their low
0.4Ω on-resistance.
An included comparator offers the AS1748 and AS1750
with headphone detection or mute/send key function.
To reduce click-and-pop sounds when switching
between pre-charged points the AS1749 and AS1750
have an internal shunt switch. This shunt switch auto-
matically discharges any capacitance at the NO and NC
connection points.
This SPDT switch is available in space-saving 10-pin
TDFN 3x3 packages and operate over the -40ºC to
+85ºC extended temperature range.
! Distortion -Free Negative Signal Throughput Down
to VCC - 5.5V
! Comparator for Headphone or Mute Detection
(AS1748/AS1750)
! Internal Shunt Resistor Reduces Click/Pop
(AS1749/AS1750)
! Low On-Resistance (RON)
0.4Ω at +2.7V Supply
! 0.25Ω On-Resistance Flatness
! 0.03Ω On-Resistance Matching
! +1.8V to +5.5V Supply Voltage
! -90dB Crosstalk (100kHz)
! -65dB Off-Isolation (100kHz)
! 0.01% Total Harmonic Distortion
! Available in 10-pin TDFN 3x3, 16-pin TQFN 3x3,
and 12-Bump WL-CSP Packages
3 Applications
The device is ideal for cell phones, PDAs and hand-held
devices, notebook computers and MP3 players.
Figure 1. Typical Operating Circuit
Out+
Audio
Source 1 Out-
NC1
NO1
NC2
Out+
Audio
Source 2 Out-
NO2
Mute
CMPO
Shunt
Switch
COM1
IN1
Input
Select
8Ω
Speaker
IN2
COM2
V+
V+/3
+
-
CMP-
Mute
Button
www.austriamicrosystems.com/Analog-Switches/AS1747-50
Revision 1.02
1 - 16
1 page  
AS1747, AS1748, AS1749, AS1750
Datasheet - Electrical Characteristics
6 Electrical Characteristics
VCC = +2.7V to +5.5V, TA = -40ºC to +85ºC, unless otherwise specified. Typical values are at VCC = +3.0V, TA = +25ºC,
unless otherwise specified.
Table 4. Electrical Characteristics
Symbol
Parameter
Analog Switch
Condition
Min Typ Max Unit
VNO_
VNC_
VCOM_
RON(NC)
RON(NO)
Analog Signal Range
On-Resistance
VCC = 2.7V; VNC_ or VNO_ =
VCC - 5.5V, -1V, 0V, 1V, 2V,
VCC; ICOM_ = 100mA
TA = +25ºC
TA = TMIN to
TMAX
VCC -
5.5
VCC
0.4 0.85
0.95
V
Ω
ΔRON
On-Resistance Match VCC = 2.7V, VNC_ or VNO_ =
Between Channels
0V, ICOM = 100mA
RFLAT(NC)
On-Resistance
Flatness
VCC = 2.7V; VNC_ or VNC = -
1V, 0V, 1V, 2V, VCC; ICOM_ =
100mA
TA = +25ºC
TA = TMIN to
TMAX
TA = +25ºC
TA = TMIN to
TMAX
0.03 0.1
0.15
0.25 0.4
0.45
Ω
Ω
RSH
Shunt Switch
Resistance
AS1749/AS1750 only,
INO_ or INC_ = 10mA, VCC =
2.7V
TA = TMIN to
TMAX
25 50 Ω
INO_(OFF)
INC_(OFF)
NO_, NC_
Off-Leakage Current
AS1747/AS1748 only,
VCC = 2.7V, switch open;
VNC_ or VNO_ = -2.5V, +2.5V;
VCOM_ = +2.5V, -2.5V
TA = +25ºC
TA = TMIN to
TMAX
-10
-200
+10
+200
nA
ICOM_(ON)
COM_
On-Leakage Current
VCC = 2.7V, switch closed;
VNC_ or VNO_ = -2.5V, +2.5V;
or floating; VCOM_ = -2.5V,
+2.5V, or floating
TA = +25ºC
TA = TMIN to
TMAX
-10
-200
+10
+200
nA
Dynamic Characteristics
VNO = 2.5V; for NO_, VIN_ = TA = +25ºC
tON
Turn-On Time1
0V to VCC; for NC_, VIN_ =
VCC to 0V; RL = 300Ω, CL =
TA = TMIN to
35pF, Figure 19
TMAX
200 400
ns
400
VNC = 2.5V; for NO_, VIN_ = TA = +25ºC
tOFF
Turn-Off Time1
VCC to 0V; for NC_, VIN_ = 0V
to VCC; RL = 300Ω, CL =
TA = TMIN to
35pF, Figure 19
TMAX
50 200
ns
200
tD
Break-Before-Make
Time Delay
VN_ = 2.5V, for NO_, VIN_ = VCC to 0V; for NC_,
VIN_ = 0V to VCC; RL = 300Ω, CL = 35pF,
Figure 20
200
ns
Q
Charge Injection
VCOM_ = 0V, RS = 0Ω, CL = 1.0nF, Figure 21
2
pC
VISO
Off-Isolation
VCC = 5V, f = 100kHz, VCOM_ = 1VRMS, RL =
50Ω, CL = 5pF, Figure 22
-65
dB
VCT
Crosstalk
VCC = 5V, f = 100kHz, VCOM_ = 1VRMS, RL =
50Ω, CL = 5pF, Figure 22
-90
dB
PSRR
Power-Supply
Rejection Ratio
f = 10kHz, VCOM_ = 1VRMS, RL = 50Ω, CL = 5pF
70
dB
BW
On-Channel-3dB
Bandwidth
VCC = 5V, Signal = 0dBm, RL = 50Ω, CL = 5pF,
Figure 22
31
MHz
www.austriamicrosystems.com/Analog-Switches/AS1747-50
Revision 1.02
5 - 16
5 Page 
AS1747, AS1748, AS1749, AS1750
Datasheet - Timing Diagrams
10 Timing Diagrams
Figure 19. Switching Time
VN_
Logic
Input
NO_
OR NC_
IN_
GND
VCC
VCC
COM_
VOUT
RL CL
CL includes fixture and stray capacitance
VOUT = VN_(RL / (RL + RON))
Logic VCC
Input 0V
Switch 0V
Output
50%
tr < 5ns
tf < 5ns
tOFF
VOUT 0.9 x VOUT
0.9 x VOUT
IN depends on switch configuration;
Input polarity determined by sense of switch.
tON
Figure 20. Break-Before-Make Interval
VCC
VN_
Logic
Input
NC_
NO_
IN_
VCC
COM_
VOUT
VCC
Logic
Input
0V
RL CL
GND
CL includes fixture and stray capacitance
VOUT
50%
tBBM
0.9 x VOUT
Figure 21. Charge Injection
RGEN
+
VGEN
NC_
OR NO_
GND
VCC
VCC
COM_
IN_
VIL to VIH
ΔVOUT
VOUT
VOUT
CL
IN OFF
IN OFF
ON
ON
Q = (ΔVOUT)(CL)
OFF
OFF
Logic input waveforms inverted for switches
that have the opposite logic sense.
www.austriamicrosystems.com/Analog-Switches/AS1747-50
Revision 1.02
11 - 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AS1748.PDF ] | |
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