IDTHS221P10 datasheet(3/11 Pages) IDT

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IDTHS221P10

HYBRID SWITCH WITH NEGATIVE SIGNAL HANDLING

HYBRID SWITCH

IDT™ HYBRID SWITCH WITH NEGATIVE SIGNAL HANDLING

IDTHS221P10 REV F 112108

Detailed Description

The IDTHS221P10 device is a dual single pole/double throw

(SPDT) 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 2 to 1 multiplexer to

select between USB differential data signals and audio L

and R stereo signals. It comes in tiny µMLP packages for

use in cell phones, MP3 players, PDAs, and other personal

media players.

The part consists of one hybrid dual 2

Ω audio 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 IDTHS221P10 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 IDTHS221P10 has a SEL pin that select between the

audio switches and the USB switches. This pin can be

driven LOW or HIGH to switch between the audio inputs and

USB data inputs.

Audio Switches

The two audio switches (L, R) are 2

Ω¸ 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. The audio switches are active

(turned ON) whenever the SEL voltage to <0.5 V.

Note: Whenever the audio switches are ON the USB

transceivers need to be in the high impedance state or static

high or low state.

USB Switches

The two USB switches (D+, D-) are 5

Ω¸ bidirectional

switches that were designed to pass high-speed USB

differential signals in the range of ±0V to 400 mV. 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 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 IDTHS221P10 device is determined by the

voltage at the SEL pin. Refer to truth table on page 2 of data

sheet. These logic pins are 1.8 V logic compatible, and can

be controlled by a standard µprocessor.

The SEL pin is internally pulled low through a 4M

Ω resistor

to ground and can be left floating or tri-stated by the

µprocessor.

Logic control voltage levels:

SEL = Logic “0” (Low) when <0.5 V

SEL = Logic “1” (High) when >1.2 V

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