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參數(shù)資料
| 型號(hào)： | ISL54205EVAL1Z |
| 廠(chǎng)商： | Intersil Corporation |
| 英文描述： | MP3/USB 2.0 High Speed Switch with Negative Signal Handling |
| 中文描述： | MP3/USB 2.0高的負(fù)信號(hào)處理速度開(kāi)關(guān) |
| 文件頁(yè)數(shù)： | 8/14頁(yè) |
| 文件大小： | 352K |
| 代理商： | ISL54205EVAL1Z |
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8
FN6342.1
December 7, 2006
Application Block Diagram
Detailed Description
The ISL54205A device is a dual single pole/double throw
(SPDT) analog switch device that operates from a single DC
power supply in the range of 2.7V to 3.6V. 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
μ
TQFN and TDFN packages for use in MP3
players, PDAs, cell phones, and other personal media
players.
The part consists of two 3
Ω
audio switches and two 5
Ω
USB
switches. The audio switches can accept signals that swing
below ground. They were designed to pass audio left and
right stereo signals, that 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 ISL54205A was specifically designed for MP3 players,
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. A typical application
block diagram of this functionality is shown above.
The ISL54205A incorporates circuitry for the detection of the
USB V
BUS
voltage, which is used to switch between the
audio CODEC drivers and USB transceiver of the MP3
player or cell phone. The ISL54205A contains a logic control
pin (CTRL) that when driven Low while V
BUS
is Low, opens
all switches and puts the part into a low power state, drawing
typically 1nA of I
DD
current.
A detailed description of the two types of switches is
provided in the sections below. The USB transmission and
audio playback are intended to be mutually exclusive
operations.
Audio Switches
The two audio switches (L, R) are 3
Ω
switches that can pass
signals that swing below ground. Crosstalk between the
audio switches over the audio band is < -110dB.
Over a signal range of
±
1V (0.707Vrms) with V
DD
>2.7V,
these switches have an extremely low r
ON
resistance
variation. They can pass ground referenced audio signals
with very low distortion (<0.06% THD+N) when delivering
15.6mW into a 32
Ω
headphone speaker load. See Figures 8,
9, 10, and 11 THD+N performance curves.
These switches are uni-directional switches. The audio
drivers should be connected at the L and R side of the switch
(pins 7 and 8) and the speaker loads should be connected at
the COM side of the switch (pins 3 and 4).
The audio switches are active (turned ON) whenever the
V
BUS
voltage is
≤
to V
DD
+ 0.2V or floating and the CTRL
voltage
≥
to 1.4V.
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 are designed to pass high-speed USB differential
signals in the range of 0V to 400mV. The switches have low
capacitance and high bandwidth to pass USB high-speed
signals (480Mbps) with minimum edge and phase distortion
to meet USB 2.0 signal quality specifications. See Figure 12
for High-speed Eye Pattern taken with switch in the signal
path.
The maximum signal range for the USB switches is from
-1.5V to V
DD
. The signal voltage at D- and D+ should not be
allowed to exceed the V
DD
voltage rail or go below ground
by more than -1.5V.
ISL54205A
USB
TRANSCEIVER
HIGH-SPEED
CODEC
U
COM -
COM +
V
BUS
GND
D-
D+
L
R
V
DD
CTRL
LOGIC CIRCUITRY
μ
CONTROLLER
22k
Ω
4M
Ω
4M
Ω
50k
Ω
50k
Ω
ISL54205A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL54206 | MP3/USB 2.0 High Speed Switch with Negative Signal Handling |
| ISL54206IRUZ-T | MP3/USB 2.0 High Speed Switch with Negative Signal Handling |
| ISL54206IRZ | MP3/USB 2.0 High Speed Switch with Negative Signal Handling |
| ISL54206IRZ-T | MP3/USB 2.0 High Speed Switch with Negative Signal Handling |
| ISL54207 | Low Voltage, Dual SPDT, USB/CVBS/ Audio Switches, with Negative Signal Capability |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL54205IRUZ-T | 制造商:Intersil Corporation 功能描述:AUDIO/USB SWITCH, 10LD 2.1X1.6X.5MM UTQFN IND, T&R - Tape and Reel 制造商:Intersil 功能描述:AUD/USB SWITCH 10LD 2 1X1 6X 5MM IND |
| ISL54206 | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:MP3/USB 2.0 High Speed Switch with Negative Signal Handling |
| ISL54206A | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:MP3/USB 2.0 High Speed Switch with Negative Signal Handling |
| ISL54206A_1010 | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:MP3/USB 2.0 High Speed Switch with Negative Signal Handling |
| ISL54206AEVAL1Z | 功能描述:EVALUATION BOARD FOR ISL54206A RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
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