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PDF ISL54211 Data sheet ( Hoja de datos )
| Número de pieza | ISL54211 | |
| Descripción | MP3/USB 2.0 High Speed Switch | |
| Fabricantes | Intersil | |
| Logotipo |  |
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®
Data Sheet
August 25, 2008
ISL54211
FN6662.1
MP3/USB 2.0 High Speed Switch with
Negative Signal Handling/Click and Pop
Suppression
The Intersil ISL54211 dual SPDT (Single Pole/Double Throw)
switches combine low distortion audio and accurate USB 2.0
high speed data (480Mbps) signal switching in the same low
voltage device. When operated with a 2.7V to 5.0V single
supply these analog switches allow 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 ISL54211 logic control pins are 1.8V compatible with a
supply voltage of 2.7V to 3.6V, which allows for control via a
standard µcontroller.
The part has an audio enable control pin (CTRL) to open all
in-line switches and activate the audio click and pop circuitry.
The high OFF-isolation and special click/pop circuitry of the
audio switches eliminates click and pops in the head-phones
when the audio CODEC drivers are powering up or down or
when a headphone is inserted or removed from the
headphone jack.
It’s available in a tiny 10 Ld 1.8mmx1.4mm ultra-thin µTQFN
package and a 10 Ld 3mmx3mm TDFN package. It operates
over a temperature range of -40 to +85°C.
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
Application Block Diagram
Features
• High Speed (480Mbps) and Full Speed (12Mbps)
Signaling Capability per USB 2.0
• Low Distortion Negative Signal Capability
• Clickless/Popless Audio Switches
• Enable Control Pin (CTRL) to Open all Switches
• Low Distortion Headphone Audio Signals
- THD+N at 1mW into 32Ω Load . . . . . . . . . . . . . 0.014%
• Crosstalk (20Hz to 20kHz). . . . . . . . . . . . . . . . . . . -100dB
• OFF-Isolation (20Hz to 100kHz) . . . . . . . . . . . . . . . 95dB
• Single Supply Operation (VDD) . . . . . . . . . . . . 2.7V to 5.0V
• -3dB Bandwidth USB Switch . . . . . . . . . . . . . . . . . 700MHz
• Available in µTQFN and TDFN Packages
• Compliant with USB 2.0 Short Circuit Requirements
Without Additional External Components
• Pb-Free (RoHS Compliant)
Applications
• MP3 and other Personal Media Players
• Cellular/Mobile Phones
• PDA’s
• Audio/USB Switching
VBUS
3.3V
VDD
ISL54211
IN
LOGIC CONTROL
4MΩ
CTRL
4MΩ
COM -
COM +
200kΩ
200kΩ
CLICK
AND
POP
D-
D+
R
L
GND
µCONTROLLER
USB HIGH-SPEED
TRANSCEIVER
AUDIO CODEC
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL54211
Electrical Specifications - 2.7V to 3.6V Supply Test Conditions: VDD = +3.0V, GND = 0V, VINH = 1.4V, VINL = 0.5V,
VCTRLH = 1.4V, VCTRLL = 0.5V, (Note 8), Unless Otherwise Specified. (Continued)
PARAMETER
TEST CONDITIONS
TEMP
MIN
TYP MAX
(°C) (Notes 9, 10) (Note 12) (Notes 9, 10) UNITS
USB Switch -3dB Bandwidth Signal = 0dBm, 0.2VDC offset, RL = 50Ω, CL = 5pF
+25
-
700
- MHz
D+/D- OFF Capacitance,
f = 1MHz, VDD = 3.0V, IN = float, CTRL = 3.0V, VD- or +25
-
4
- pF
CD+OFF, CD-OFF
VD+ = VCOMx = 0V (see Figure 4)
COM ON Capacitance, CCOM- f = 1MHz, VDD = 3.0V, IN = 3.0V, CTRL = 0V or 3V, VD- +25
-
9
- pF
(ON), CCOM+(ON)
or VD+ = VCOMx = 0V, (See Figure 4)
POWER SUPPLY CHARACTERISTICS
Power Supply Range, VDD
Positive Supply Current, IDD
(Audio Mode)
VDD = 3.6V, IN = 0V, CTRL = 3.6V
Full 2.7
3.6 V
+25 -
7 10 µA
Full -
- 12 µA
Positive Supply Current, IDD VDD = 3.6V, IN = 3.6V, CTRL = 3.6V
(USB Mode)
+25 - 2.4 4 µA
Full - - 5 µA
Positive Supply Current, IDD VDD = 3.6V, IN = 0V, CTRL = 0V
(Mute Mode)
+25 - 2.4 4 µA
Full - - 5 µA
DIGITAL INPUT CHARACTERISTICS
IN Voltage Low, VINL
VDD = 2.7V to 3.6V
Full -
- 0.5 V
IN Voltage High, VINH
VDD = 2.7V to 3.6V
Full 1.4
-
-V
CTRL Voltage Low, VCTRLL VDD = 2.7V to 3.6V
Full -
- 0.5 V
CTRL Voltage High, VCTRLH VDD = 2.7V to 3.6V
Full 1.4
-
-V
Input Current, IINL, ICTRLL VDD = 3.6V, IN = 0V or float, CTRL = 0V or float Full -50 2 50 nA
Input Current, IINH
VDD = 3.6V, IN = 3.6V, CTRL = 0V or float
Full -2 1 2 µA
Input Current, ICTRLH
VDD = 3.6V, IN = 0V or float, CTRL = 3.6V
Full -2 1 2 µA
IN Pull-Down Resistor, RIN VDD = 3.6V, IN = 3.6V, CTRL = 0V or float; measure
Full
-
4
- MΩ
current through the internal pull-down resistor and
calculate resistance value.
CTRL Pull-Down Resistor, VDD = 3.6V, IN = 0V or float, CTRL = 3.6V; measure
Full
-
4
- MΩ
RCTRL
current through the internal pull-down resistor and
calculate resistance value.
NOTES:
8. Vlogic = Input voltage to perform proper function.
9. The algebraic convention, whereby the most negative value is a minimum and the most positive a maximum, is used in this data sheet.
10. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by
characterization and are not production tested.
11. Flatness is defined as the difference between maximum and minimum value of ON-resistance over the specified analog signal range.
12. Limits established by characterization and are not production tested.
13. rON matching between channels is calculated by subtracting the channel with the highest max rON value from the channel with lowest max rON
value, between L and R or between D+ and D-.
5 FN6662.1
August 25, 2008
5 Page 
ISL54211
CTRL = Logic “0” (Low) when ≤ 0.5V or Floating.
CTRL = Logic “1” (High) when ≥ 1.4V
Audio Mode
If the IN pin = Logic “0” and CTRL pin = Logic “1” the part will
be in the Audio mode. In Audio mode the L (left) and R (right)
2.5Ω audio switches are ON, the D- and D+ 5.5Ω switches
are OFF (high impedance) and the audio click and pop
circuitry is OFF (high impedance).
When nothing is plugged into the common connector or a
headphone is plugged into the common connector, the
µprocessor will sense that there is no voltage at the VBUS
pin of the connector and will drive and hold the IN control pin
of the ISL54211 low. As long as the CTRL = Logic “1”, the
ISL54211 part remains in the audio mode and the audio
drivers of the player can drive the headphones and play
music.
USB Mode
If the IN pin = Logic “1” and CTRL pin = Logic “0” or
Logic “1”, the part will go into USB mode. In USB mode the
D- and D+ 5.5Ω switches are ON and the L and R 2.5Ω
audio switches are OFF (high impedance).
When a USB cable from a computer or USB hub is
connected at the common connector, the µprocessor will
sense the presence of the 5V VBUS voltage and drive the IN
pin voltage high. The ISL54211 part will go into the USB
mode. In USB mode the computer or USB hub transceiver
and the MP3 player or cellphone USB transceiver are
connected and digital data will be able to be transmit back
and forth.
When the USB cable is disconnected, the µprocessor will
sense that the 5V VBUS voltage is no longer connected and
will drive the IN pin low and put the part back into the Audio
or Mute mode.
Mute Mode
If the IN pin = Logic “0” and CTRL pin = Logic “0”, the part
will be in the Mute mode. In the Mute mode, the audio
switches and the USB switches are OFF (high impedance)
and the audio click and pop circuitry is ON.
Before powering down or powering up of the audio CODECs
drivers, the ISL54211 should be put in the Mute mode. In
Mute mode, transients present at the L and R signal pins due
to the changing DC voltage of the audio drivers will not pass
to the headphones, preventing clicks and pops in the
headphones.
Before power-up and power-down of the ISL54211, part the
IN and CTRL control pins should be driven to ground or
tri-stated. This will put the switch in the mute state, which
turns all switches OFF and activates the click and pop
circuitry. This will minimize transients at the speaker loads
during power-up and power-down. See Figure 30 in the
“Typical Performance Curves” on page 17.
AC-COUPLED CLICK AND POP OPERATION
Single supply audio drivers have their signal biased at a DC
offset voltage, usually at 1/2 the DC supply voltage of the
driver. As this DC bias voltage comes up or goes down
during power-up or power-down of the driver, a transient can
be coupled into the speaker load through the DC blocking
capacitor (see “Typical Application Block Diagrams” on
page 9).
When a driver is OFF and suddenly turned ON, the rapidly
changing DC bias voltage at the output of the driver will
cause an equal voltage at the input side of the switch due to
the fact that the voltage across the blocking capacitor cannot
change instantly. If the switch is in the Audio mode or there is
no low impedance path to discharge the blocking capacitor
voltage at the input of the switch, before turning on the audio
switch, a transient discharge will occur in the speaker,
generating a click/pop noise.
Proper elimination of a click/pop transient at the speaker
loads while powering up or down of the audio drivers
requires that the ISL54211 have its click/pop circuitry
activated by putting the part in the Mute mode. This allows
the transients generated by the audio drivers to be
discharged through the click and pop shunt circuitry.
Once the driver DC bias has reached VDD/2 and the
transient on the switch side of the DC blocking capacitor has
been discharged to ground through the click/pop shunt
circuitry, the audio switches can be turned ON and
connected through to the speaker loads without generating
any undesirable click/pop noise in the speakers.
With a typical DC blocking capacitor of 220µF and the
click/pop shunt circuitry designed to have a resistance of
20Ω to 70Ω, allowing a 100ms wait time to discharge the
transient before placing the switch in the Audio mode will
prevent the transient from getting through to the speaker
load. See Figures 28 and 29 in the “Typical Performance
Curves” page 16.
USING THE COMPUTER VBUS VOLTAGE TO DRIVE THE
“IN” PIN
Rather than using a micro-processor to control the IN logic
pin, one can directly drive the IN pin using the VBUS voltage
from the computer or USB hub. See the “Typical Application
Block Diagrams” on page 9.
When a headphone or nothing is connected at the common
connector, the internal 4MΩ pull-down will pull the IN pin low,
putting the ISL54211 in the Audio or Mute mode, depending
on the condition of the CTRL pin.
When a USB cable is connected at the common connector,
the voltage at the IN pin will be driven to 5V and the part will
automatically go into the USB mode.
When the USB cable is disconnected from the common
connector, the voltage at the IN pin will be pulled low by the
11 FN6662.1
August 25, 2008
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet ISL54211.PDF ] | |
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