PRELIMINARY DATASHEET
HYBRID SWITCH WITH NEGATIVE SIGNAL HANDLING
IDTHS231P16
Description
The IDTHS231P16 is a high-performance hybrid switch
device, combined with hybrid low distortion audio, UART
and an USB 2.0 high speed data (480 Mbps) signal
switches. When operated with a 1.8 V single supply, this
high performance switch allows audio signal swings
below-ground, allowing the use of a common USB and
audio headphone connector in personal media players and
other portable battery powered devices.
The IDTHS231P16 logic SELx control pins are 1.8 V
compatible which allows for control via a standard
µcontroller. With a VDD voltage in the range of 1.7 V to 1.95
V, the device can pass USB 3 V signal sources in the
portable device, with up to 5.5 V tolerant on USB and COM
signal pins. The part has an audio enable control pin to
open all the switches and put the part in a low power state.
The IDTHS231P16 is available in a small 16-pin QFN
package.
Features
•
+1.7 V to +1.95 V single-supply operation
•
Low distortion negative signal handling capability with
Ron typically 3Ω for Audio signal
•
•
•
•
•
Control pin to open all switches and enter low power state
Cross-talk audio channels (20 Hz to 20 kHz): -110dB
-3dB bandwidth USB switches: 700 MHz
Available in 16-pin QFN package – RoHS compliant
Compliant with USB 2.0 short circuit requirements
without additional external components
Applications
•
•
•
•
MP3 and other personal media players
PDA’s
Audio/USB Switching
Cellular and mobile phones
Block Diagram
SEL0
SEL1
Control
Circuit
D+
R
U+
D-
L
U-
COM-
COM+
VDD
GND
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HYBRID SWITCH WITH NEGATIVE SIGNAL HANDLING
HYBRID SWITCH
Pin Assignment
(16-pin QFN)
GND
VDD
NC
NC
Truth Table (COM+, COM-)
SEL1
0
SEL0
0
1
0
1
COM+
D+
U+
R
COM-
D-
U-
L
Power Down
SEL0
D-
U-
L
1
SEL1
D+
U+
0
1
1
4
R
COM+
NC
NC
COM-
16-pin QFN
Pin Descriptions
Pin Number Pin Name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SEL0
D-
U-
L
COM-
NC
NC
COM+
R
U+
D+
SEL1
VDD
NC
NC
GND
3 V USB Signal. Bi-directional.
UART Signal. Bi-directional.
Audio signal pin (left). Uni-directional. ±1.5 V signal.
Audio and USB signal common pin. Bi-direction in USB mode, uni-directional in Audio
mode.
No connection.
No connection.
Audio and USB signal common pin. Bi-direction in USB mode, uni-directional in Audio
mode.
Audio signal pin (right). Uni-directional. ±1.5 V signal.
UART Signal. Bi-directional.
3 V USB Signal. Bi-directional.
Control signal pin. Internal pull-down resistor.
Power pin. +1.8 V VDD.
No connection.
No connection.
Ground pin. 0V reference.
Pin Description
Control signal pin. Internal pull-down resistor.
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Detailed Description
The IDTHS231P16 device is a dual single pole/triple throw
(SPTT) high performance switch device that can operate
from a single DC power supply in the range of 1.7 V to 1.95
V. It was designed to function as a dual 3 to 1 multiplexer to
select between USB differential data signals, UART signals
and audio L and R stereo signals. It comes in tiny QFN
packages for use in cell phones, MP3 players, PDAs, and
other personal media players.
The part consists of one hybrid dual 3Ω audio, 5Ω UART and
5Ω USB switches. The hybrid switch can accept audio
signals that swing below ground and USB signals. They
were designed to pass audio left and right stereo signals,
and are ground referenced, with minimal distortion. The
USB switches were designed to pass high-speed USB
differential data signals with minimal edge and phase
distortion.
The IDTHS231P16 was specifically designed for cell
phones and other personal media player applications that
need to combine the audio headphone jack and the USB
data connector into a single shared connector, thereby
saving space and component cost.
The IDTHS231P16 has SELx pins that select between the
audio switches, UART and the USB switches. These pins
can be driven LOW or HIGH to switch between the audio
inputs and USB data inputs.
U-) are typically 5Ω¸ bidirectional switches that were
designed to pass high-speed USB differential signals in the
range of ±0V to 400 mV, and UART signals. These switches
have low capacitance and high bandwidth to pass USB
high-speed signals (480 Mbps) with minimum edge and
phase distortion to meet USB 2.0 high-speed signal quality
specifications.
The maximum signal range for the USB switches is from 0V
to 3.6 V. The signal voltage at D- and D+ should not be allow
to exceed the 3.6 voltage rail or go below ground.
The USB switches are active (turned ON) whenever the SEL
voltage is >1.2 V.
Note:
Whenever the USB switches are ON, the UART or the
audio drivers of the CODEC need to be at AC or DC ground
or floating to keep from interfering with the data
transmission.
Logic Control
The state of the IDTHS231P16 device is determined by the
voltage at the SEL pins. Refer to truth table on page 2 of
data sheet. These logic pins are 1.8 V logic compatible so
that it can be controlled by a standard µprocessor.
The SELx pins is internally pulled low through a 4MΩ
resistor to ground and can be left floating or tri-stated by the
µprocessor.
Logic control voltage levels:
SELx = Logic “0” (Low) when <0.5 V
SELx = Logic “1” (High) when >1.2 V
Audio Switches
The two audio switches (L, R) are typically 3Ω¸ switches that
can pass signals that swing below ground by as much as 1.5
V. They were designed to pass ground reference stereo
signals with minimal insertion loss and very low distortion.
Crosstalk between the audio switches over the audio band
is typically < -110dB.
These audio switches are uni-directional switches. The
audio drivers should be connected at the L and R side of the
switch and the speaker loads should be connected at the
COM side of the switch.
Note:
Whenever the audio switches are ON the USB and
UART transceivers need to be in the high impedance state
or static high or low state.
USB/ UART Switches
The two USB switches (D+, D-) and two UART switches (U+,
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Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the IDTHS231P16. These ratings, which
are standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at
these or any other conditions above those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical
parameters are guaranteed only over the recommended operating temperature range.
Item
VDD to GND
Ambient Operating Temperature Range
Continuous Current (audio switches)
Peak Current (audio switches)
Pulsed 1 ms, 10% duty cycle max.
Continuous Current (USB or UART switches)
Peak Current (USB or UART switches)
Pulsed 1 ms, 10% duty cycle max.
Voltages
Switch I/O Voltage - D+, D-, COM+, COM- (see note below)
Switch I/O Voltage - L, R (see note below)
SELx (see note below)
ESD Rating
HBM
MM
CDM
>7 kV
>200 V
>1 kV
Rating
-0.3 V to 6.0 V
-40°C to +85°C
±150 mA
±300 mA
±40 mA
±100 mA
-0.3 V to +6 V
-2 V to +2 V
-0.3 V to [(VDD) + 0.3 V]
Note:
These specifications are for absolute maximum rating. Not recommended for typical operation.
Recommended Operating Conditions
1
Symbol
V
DD
Supply Voltage
Storage Temperature
Parameter
Rating
1.7 V to 1.95 V
-40°C to +85°C
Note 1: The input and output negative voltage ratings may be exceeded if the input and output diode current ratings
are observed. DC switch voltage may never exceed 1.95 V.
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Electrical Characteristics – 1.7 V to 1.95 V Supply
Unless stated otherwise,
VDD = 1.7 V to 1.95 V, GND = 0V
Parameter
Audio Signal Range
On-Resistance
R
ON
Matching Between
Channels
R
ON
Flatness
USB Signal Range
On-Resistance
R
ON
Matching Between
Channels
OFF-leakage Current
ON-leakage Current
Symbol
V
ANALOG
R
ON
R
ON
R
FLAT(ON)
V
Digital
R
ON
R
ON
I
D+(OFF)
or
I
D-(OFF)
I
Dx
Conditions
Min.
-1.5
Typ.
Max.
1.5
Units
V
Ω
Ω
Ω
Audio Switches (L, R)
V
L/R
= -2 V, 0V, 0.7 V, V
BUS
= 0V
V
AUDIO
-0.7 V, V
AUDIO
I
ON
= -26 mA
V
L/R
= 0.7 V I
ON
= -26 mA
I
ON
= -26 mA
0
V
D+/D-
= 0V, 0.4 V, I
ON
= -8 mA
V
D+/D-
= 0V, I
ON
= -8 mA
D+, D-, R, L = Floating
VDD = 1.8 V
U+, U-, D+, D-, R, L = 0.3 V
VDD = 1.8 V
5
0.3
±50
±50
3
0.3
1.5
USB/UART Switches (D+, D-, U+, U-)
3.6
V
Ω
Ω
nA
nA
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IDTHS231P16
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FPGA/CPLD
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