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Low Voltage, Dual SPDT, USB/CVBS/
Audio Switches, with Negative Signal
Capability
ISL54208
December 18, 2006
FN6410.0
Features
• High Speed (480Mbps) Signaling Capability per USB 2.0
• Low Distortion Negative Signal Capability
The Intersil ISL54208 dual SPDT (Single Pole/Double
Throw) switches combine low distortion audio/video and
accurate USB 2.0 high speed (480Mbps) data signal
switching in the same low voltage device. When operated
with a 2.7V to 3.6V single supply these analog switches
allow audio/video signal swings below-ground, allowing the
use of a common USB and audio/video connector in digital
cameras, camcorders and other portable battery powered
Personal Media Player devices.
• Control Pin to Open all Switches and Enter Low Power
State
• Low Distortion Mono Audio Signal
- THD+N at 20mW into 32Load . . . . . . . . . . . . . <0.1%
• Low Distortion Color Video Signal
- Differential Gain . . . . . . . . . . . . . . . . . . . . . . . . . . 0.28%
- Differential Phase. . . . . . . . . . . . . . . . . . . . . . . . . . 0.04°
• Cross-talk NCx Channels (4MHz) . . . . . . . . . . . . . . -78dB
The ISL54208 logic control pins are 1.8V logic compatible
which allows control via a standard controller. With a VDD
voltage in the range of 2.7V to 3.6V the IN pin voltage can
exceed the VDD rail allowing for the USB 5V VBUS voltage
from a computer to directly drive the IN pin to switch
between the audio/video and USB signal sources in the
portable device. The part has an enable control pin to open
all the switches and put the part in a low power state.
• Single Supply Operation (VDD) . . . . . . . . . . . . 1.8V to 5.5V
• -3dB Bandwidth USB NOx Switches . . . . . . . . . . . 630MHz
• Available in TQFN and TDFN Packages
• Pb-Free Plus Anneal (RoHS Compliant)
• Compliant with USB 2.0 Short Circuit Requirements
Without Additional External Components
The ISL54208 is available in a small 10 Ld 2.1mmx1.6mm
ultra-thin TQFN package and a 10 Ld 3mmx3mm TDFN
package. It operates over a temperature range of -40 to
+85°C.
Applications
• Digital Camera and Camcorders
• Video MP3 and other Personal Media Players
Related Literature
• Cellular/Mobile Phones
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• PDA’s
• Audio/Video/USB Switching
• Application Note AN557 “Recommended Test Procedures
for Analog Switches”
Application Block Diagram
VDD
USB AND AUDIO/VIDEO JACK
IN
VBUS
CONTROLLER
ISL54208
CTRL
LOGIC CIRCUITRY
D-
4M
NO1
COM1
NO2
50k
COM2
50k
D+
USB
HIGH-SPEED
TRANSCEIVER
NC1
NTSC or PAL
NC2
VIDEO
AUDIO
GND
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 LLC 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ISL54208
Pinouts
(Note 1)
ISL54208
(10 LD TDFN)
TOP VIEW
CTRL
ISL54208
(10 LD TQFN)
TOP VIEW
10
4M
VDD
1
4M
10
CTRL
9
NO1
9
NO1
IN
2
2
8
NO2
COM 1
3
8
NO2
COM 1
3
7
NC1
COM 2
4
7
NC1
COM 2
4
6
NC2
GND
5
6
NC2
VDD
1
IN
LOGIC
CONTROL
50k
50k
50k
50k
GND
5
LOGIC
CONTROL
NOTE:
1. ISL54208 Switches shown for IN = Logic “0” and CTRL = Logic “1”.
Truth Table
Pin Descriptions
ISL54208
ISL54208
IN
CTRL
NC1, NC2
NO1, NO2
PIN NO.
NAME
0
0
OFF
OFF
1
VDD
0
1
ON
OFF
2
IN
1
X
OFF
ON
3
COM1
Voice/Video and USB Common Pin
4
COM2
Voice/Video and USB Common Pin
5
GND
Ground Connection
6
NC2
Audio or Video Input
7
NC1
Audio or Video Input
8
NO2
USB Differential Input
9
NO1
USB Differential Input
10
CTRL
Digital Control Input (Audio/Vidio Enable)
IN: Logic “0” when  0.5V, Logic “1” when 1.4V with 2.7V to 3.6V
supply.
CTRL: Logic “0” when  0.5V or Floating, Logic “1” when 1.4V with
2.7V to 3.6V supply.
FUNCTION
Power Supply
Digital Control Input
Ordering Information
PART NUMBER
(Note)
PART
MARKING
TEMP. RANGE (°C)
PACKAGE (Pb-Free)
PKG. DWG. #
ISL54208IRUZ-T
FR
-40 to +85
10 Ld 2.1x1.6mm TQFN Tape and Reel
L10.2.1x1.6A
ISL54208IRZ-T
4208
-40 to +85
10 Ld 3mmx3mm TDFN Tape and Reel
L10.3x3A
ISL54208IRZ
4208
-40 to +85
10 Ld 3mmx3mm TDFN
L10.3x3A
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate
or NiPdAu termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products
are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
2
FN6410.0
December 18, 2006
ISL54208
Absolute Maximum Ratings
Thermal Information
VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to 6.0V
Input Voltages
NCx, NOx(Note 2) . . . . . . . . . . . . . . . . . . . . -2V to ((VDD) + 0.3V)
IN (Note 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -2V to 5.5V
CTRL (Note 2) . . . . . . . . . . . . . . . . . . . . . . -0.3 to ((VDD) + 0.3V)
Output Voltages
COMx (Note 2) . . . . . . . . . . . . . . . . . . . . . . -2V to ((VDD) + 0.3V)
Continuous Current (NCx, COMx) . . . . . . . . . . . . . . . . . . . ±150mA
Peak Current (NCx, COMx)
(Pulsed 1ms, 10% Duty Cycle, Max). . . . . . . . . . . . . . . . ±300mA
Continuous Current (NOx) . . . . . . . . . . . . . . . . . . . . . . . . . . ±40mA
Peak Current (NOx)
(Pulsed 1ms, 10% Duty Cycle, Max) . . . . . . . . . . . . . . . . ±100mA
ESD Rating:
HBM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >7kV
MM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >400V
CDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .>1.4kV
Thermal Resistance (Typical, Note 3)
JA (°C/W)
10 Ld TQFN Package . . . . . . . . . . . . . . . . . . . . . . .
130
10 Ld 3x3 TDFN Package. . . . . . . . . . . . . . . . . . . . .
110
Maximum Junction Temperature (Plastic Package) . . . . . . . +150°C
Maximum Storage Temperature Range. . . . . . . . . . . . -65°C to +150°C
Operating Conditions
Temperature Range ISL54208IRUZ and
ISL54208IRZ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
2. Signals on NOx, NCx, COMx, CTRL, IN exceeding VDD or GND by specified amount are clamped. Limit current to maximum current ratings.
3. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications - 2.7V to 3.6V Supply Test Conditions: VDD = +3.3V, GND = 0V, VINH = 1.4V, VINL = 0.5V, VCTRLH = 1.4V,
VCTRLL = 0.5V, (Notes 4, 6), unless otherwise specified.
PARAMETER
TEST CONDITIONS
TEMP
(°C)
(NOTE 5)
MIN
TYP
(NOTE 5)
MAX
UNITS
ANALOG SWITCH CHARACTERISTICS
Audio/Video Switches (NC1, NC2)
Analog Signal Range, VANALOG
VDD = 3.0V, IN = 0.5V, CTRL = 1.4V
Full
-1.5
-
1.5
V
ON Resistance, RON
VDD = 3.0V, IN = 0.5V, CTRL = 1.4V, ICOMx = 100mA,
VNCx = -0.85V to 0.85V,
(See Figure 3)
25
-
2.65
4

Full
-
-
5.5

25
-
0.02
0.13

Full
-
-
0.16

25
-
0.03
0.05

Full
-
-
0.07

VDD = 3.6V, IN = 0V, CTRL = 3.6V, VCOM- or VCOM+ =
-0.85V, 0.85V, VNCx = -0.85V, 0.85V,
VNOx = floating, Measure current through the discharge
pull-down resistor and calculate resistance value.
25
-
50
-
k
Analog Signal Range, VANALOG
VDD = 3.6V, IN = 1.4V, CTRL = 1.4V
Full
0
-
VDD
V
ON Resistance, RON
VDD = 3.6V, IN = 1.4V, CTRL = 1.4V, ICOMx = 40mA,
VNOx = 0V to 400mV
(See Figure 4)
25
-
4.6
5

Full
-
-
6.5

25
-
0.06
0.5

Full
-
-
0.55

25
-
0.4
0.6

Full
-
-
1.0

RON Matching Between Channels,
RON
VDD = 3.0V, IN = 0.5V, CTRL = 1.4V, ICOMx = 100mA,
VNCx = Voltage at max RON over signal range of -0.85V
to 0.85V, (Note 8)
RON Flatness, RFLAT(ON)
VDD = 3.0V, IN = 0.5V, CTRL = 1.4V, ICOMx = 100mA,
VNCx = -0.85V to 0.85V, (Note 7)
Discharge Pull-Down Resistance,
RNC1, RNC2
USB Switches (NO1, NO2)
RON Matching Between Channels,
RON
VDD = 3.6V, IN = 1.4V, CTRL = 1.4V,
ICOMx = 40mA, VNOx = Voltage at max RON,
(Note 8)
RON Flatness, RFLAT(ON)
VDD = 3.6V, IN = 1.4V, CTRL = 1.4V,
ICOMx = 40mA, VNOx = 0V to 400mV, (Note 7)
3
FN6410.0
December 18, 2006
ISL54208
Electrical Specifications - 2.7V to 3.6V Supply Test Conditions: VDD = +3.3V, GND = 0V, VINH = 1.4V, VINL = 0.5V, VCTRLH = 1.4V,
VCTRLL = 0.5V, (Notes 4, 6), unless otherwise specified. (Continued)
PARAMETER
TEST CONDITIONS
OFF Leakage Current, INOx(OFF)
VDD = 3.6V, IN = 0V, CTRL = 3.6V, VCOMx = 0.5V, 0V,
VNOx = 0V, 0.5V, VNCx = float
VDD = 3.3V, IN = 3.3V, CTRL = 0V or 3.3V, VNOx = 2.0V,
VCOMx , VNCx = float
ON Leakage Current, INOx
TEMP
(°C)
(NOTE 5)
MIN
TYP
(NOTE 5)
MAX
UNITS
25
-10
-
10
nA
Full
-70
-
70
nA
25
-10
2
10
nA
Full
-75
-
75
nA
DYNAMIC CHARACTERISTICS
Turn-ON Time, tON
VDD = 2.7V, RL = 50, CL = 10pF, (See Figure 1)
25
-
67
-
ns
Turn-OFF Time, tOFF
VDD = 2.7V, RL = 50, CL = 10pF, (See Figure 1)
25
-
48
-
ns
Break-Before-Make Time Delay, tD
VDD = 2.7V, RL = 50, CL = 10pF, (See Figure 2)
25
-
18
-
ns
Skew, tSKEW
VDD = 3.3V, IN = 3.3V, CTRL = 3.3V, RL = 45,
CL = 10pF,tR = tF = 750ps at 480Mbps,
(Duty Cycle = 50%) (See Figure 7)
25
-
50
-
ps
Total Jitter, tJ
VDD = 3.3V, IN = 3.3V, CTRL = 3.3V, RL = 45,
CL = 10pF,tR = tF = 750ps at 480Mbps
25
-
210
-
ps
Propagation Delay, tPD
VDD = 3.3V, IN = 3.3V, CTRL = 3.3V, RL = 45,
CL = 10pF,See Figure 7)
25
-
250
-
ps
Crosstalk (Channel-to-Channel),
NC2 to COM1, NC1 to COM2
VDD = 3.3V, IN = 0V, CTRL = 3.3V, RL = 75,
f = 4MHz, VNCx = 300mVP-P, (See Figure 6)
25
-
-78
-
dB
Differential Gain
VSIGNAL = 300mVp-p, VOFFSET = 0V to 0.7V,
f = 3.58MHz, RL = 75
25
-
0.28
-
%
Differential Phase
VSIGNAL = 300mVp-p, VOFFSET = 0V to 0.7V,
f = 3.58MHz, RL = 75
25
-
0.04
-
deg
Total Harmonic Distortion
f = 20Hz to 20kHz, VDD = 3.0V, IN = 0V,
CTRL = 3.0V, VNCx = 0.707VRMS (2VP-P), RL = 32
25
-
0.06
-
%
NCx (Audio/Video) Switch -3dB
Bandwidth
Signal = 8dBm, RL = 75,CL = 5pF, See Figure 14)
25
-
338
-
MHz
NOx (USB) Switch -3dB Bandwidth Signal = 0dBm, 0.2VDC offset, RL = 50,CL = 5pF
25
-
630
-
MHz
NOx OFF Capacitance, CNOx(OFF) f = 1MHz, VDD = 3.0V, IN = 0V, CTRL = 3.0V,
VNOx = VCOMx = 0V, (See Figure 5)
25
-
6
-
pF
NCx OFF Capacitance, CNCx(OFF) f = 1MHz, VDD = 3.0V, IN = 3.0V, CTRL = 3.0V,
VNCx = VCOMx = 0V, (See Figure 5)
25
-
9
-
pF
COMx ON Capacitance, CCOMx(ON) f = 1MHz, VDD = 3.0V, IN = 3.0V, CTRL = 3.0V,
VNOx = VCOMx = 0V, (See Figure 5)
25
-
10
-
pF
Full
1.8
5.5
V
25
-
6
8
A
Full
-
-
10
A
25
-
1
7
nA
Full
-
-
140
nA
POWER SUPPLY CHARACTERISTICS
Power Supply Range, VDD
Positive Supply Current, IDD
VDD = 3.6V, IN = 0V or 3.6V, CTRL = 3.6V
Positive Supply Current, IDD
(Low Power State)
VDD = 3.6V, IN = 0V, CTRL = 0V or float
DIGITAL INPUT CHARACTERISTICS
Voltage Low, VINL, VCTRLL
VDD = 2.7V to 3.6V
Full
-
-
0.5
V
Voltage High, VINH , VCTRLH
VDD = 2.7V to 3.6V
Full
1.4
-
-
V
Input Current, IINL, ICTRLL
VDD = 3.6V, IN = 0V, CTRL = 0V
Full
-50
20
50
nA
Input Current, IINH
VDD = 3.6V, IN = 3.6V, CTRL = 0V
Full
-50
20
50
nA
4
FN6410.0
December 18, 2006
ISL54208
Electrical Specifications - 2.7V to 3.6V Supply Test Conditions: VDD = +3.3V, GND = 0V, VINH = 1.4V, VINL = 0.5V, VCTRLH = 1.4V,
VCTRLL = 0.5V, (Notes 4, 6), unless otherwise specified. (Continued)
PARAMETER
TEST CONDITIONS
TEMP
(°C)
(NOTE 5)
MIN
TYP
(NOTE 5)
MAX
UNITS
Input Current, ICTRLH
VDD = 3.6V, IN = 0V, CTRL = 3.6V
Full
-2
1.1
2
A
CTRL Pull-Down Resistor, RCTRL
VDD = 3.6V, IN = 0V, CTRL = 3.6V
Full
-
4
-
M
NOTES:
4. VLOGIC = Input voltage to perform proper function.
5. The algebraic convention, whereby the most negative value is a minimum and the most positive a maximum, is used in this data sheet.
6. Parameters with limits are 100% tested at +25°C. Limits across the full temperature range are guaranteed by design and correlation.
7. Flatness is defined as the difference between maximum and minimum value of on-resistance over the specified analog signal range.
8. 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 NC1 and NC2 or between NO1 and NO2.
Test Circuits and Waveforms
VDD
LOGIC
INPUT
50%
0V
VINPUT
tOFF
SWITCH
INPUT VINPUT
SWITCH
INPUT
C
CTRL
VOUT
NO or NC
COMx
IN
VOUT
90%
SWITCH
OUTPUT
VDD
tr <20ns
tf <20ns
90%
VIN
RL
50
GND
CL
10pF
0V
tON
Logic input waveform is inverted for switches that have the opposite
logic sense.
Repeat test for all switches. CL includes fixture and stray
capacitance.
RL
-----------------------------V OUT = V
(INPUT) R + R
L
 ON 
FIGURE 1A. MEASUREMENT POINTS
FIGURE 1B. TEST CIRCUIT
FIGURE 1. SWITCHING TIMES
VDD
LOGIC
INPUT
VDD
CTRL
VINPUT
0V
NOx
VOUT
VIN
0V
RL
50
IN
90%
VOUT
COMx
NCx
SWITCH
OUTPUT
C
CL
10pF
GND
tD
FIGURE 2A. MEASUREMENT POINTS
Repeat test for all switches. CL includes fixture and stray
capacitance.
FIGURE 2B. TEST CIRCUIT
FIGURE 2. BREAK-BEFORE-MAKE TIME
5
FN6410.0
December 18, 2006
ISL54208
Test Circuits and Waveforms (Continued)
VDD
VDD
C
RON = V1/100mA
C
RON = V1/40mA
CTRL
CTRL
NCx
NOx
VNCx
VNOx
IN
V1
100mA
OV
40mA
COMx
VDD
IN
V1
COMx
GND
GND
Repeat test for all switches.
Repeat test for all switches.
FIGURE 3. AUDIO/VIDEO RON TEST CIRCUIT
FIGURE 4. USB RON TEST CIRCUIT
VDD
C
VDD
C
CTRL
SIGNAL
GENERATOR
CTRL
NCx
75
COMx
NCx or NOx
IN
0V
IN
IMPEDANCE
ANALYZER
0V or
VDD
COMx
GND
NCx
COMx
ANALYZER
NC
GND
RL
Signal direction through switch is reversed, worst case values
are recorded. Repeat test for all switches.
Repeat test for all switches.
FIGURE 5. CAPACITANCE TEST CIRCUIT
6
FIGURE 6. NCx CROSSTALK TEST CIRCUIT
FN6410.0
December 18, 2006
ISL54208
Test Circuits and Waveforms (Continued)
VDD
C
tri
CTRL
90%
DIN+
10%
50%
VDD
tskew_i
DIN-
90%
IN
15.8
DIN+
50%
COM1
143W
10%
DIN-
tfi
tro
15.8
OUT+
NO1
CL
COM2
OUT-
NO2
CL
143
45
45
90%
OUT+
OUT-
10%
50%
GND
tskew_o
50%
90%
10%
tf0
|tro - tri| Delay Due to Switch for Rising Input and Rising Output Signals.
|tfo - tfi| Delay Due to Switch for Falling Input and Falling Output Signals.
|tskew_0| Change in Skew through the Switch for Output Signals.
|tskew_i| Change in Skew through the Switch for Input Signals.
FIGURE 7A. MEASUREMENT POINTS
FIGURE 7B. TEST CIRCUIT
FIGURE 7. SKEW TEST
7
FN6410.0
December 18, 2006
ISL54208
Application Block Diagrams
VDD
IN
USB AND AUDIO/VIDEO JACK
CONTROLLER
ISL54208
CTRL
LOGIC CIRCUITRY
VBUS
D-
4M
NO1
COM1
NO2
50k
COM2
D+
USB
HIGH-SPEED
TRANSCEIVER
NC1
NTSC or PAL
NC2
VIDEO
50k
AUDIO
GND
LOGIC CONTROL VIA MICRO-PROCESSOR
VDD
USB AND AUDIO/VIDEO JACK
VBUS
IN
CONTROLLER
ISL54208
CTRL
LOGIC CIRCUITRY
22k
4M
D-
4M
NO1
COM1
NO2
50k
COM2
D+
USB
HIGH-SPEED
TRANSCEIVER
NC1
NTSC or PAL
NC2
VIDEO
50k
AUDIO
GND
LOGIC CONTROL VIA VBUS VOLTAGE FROM COMPUTER OR USB HUB
Detailed Description
The ISL54208 device is a dual single pole/double throw
(SPDT) analog switch device that can operate from a single
dc power supply in the range of 1.8V to 5.5V. It was
designed to function as a dual 2 to 1 multiplexer to select
between USB differential data signals and mono
audio/composite video baseband signals (CVBS). It comes
in tiny TQFN and TDFN packages for use in cameras,
camcorders, video MP3 players, PDAs, cell phones, and
other personal media players.
The part consists of two 3 audio/video switches and two
5 USB switches. The audio/video switches can accept
signals that swing below ground. They were designed to
pass ground reference audio or dc restored with synch
composite video signals with minimal distortion. The USB
switches were designed to pass high-speed USB differential
data signals with minimal edge and phase distortion.
8
The ISL54208 was specifically designed for digital cameras,
camcorders, MP3 players, cell phones and other personal
media player applications that need to combine the
audio/video jacks and the USB data connector into a single
shared connector, thereby saving space and component
cost. Typical application block diagrams of this functionality
is shown above.
The ISL54208 logic control pins are 1.8V logic compatible
and can be driven by a standard controller. It has a single
logic control pin (IN) that selects between the audio/video
switches and the USB switches. The ISL54208 also contains
a logic control pin (CTRL) that when driven Low while IN is
Low, opens all switches and puts the part into a low power
state, drawing typically 1nA of IDD current.
A detailed description of the two types of switches is
provided in the sections below. The USB transmission and
FN6410.0
December 18, 2006
ISL54208
audio/video playback are intended to be mutually exclusive
operations.
NC1 and NC2 Audio/Video Switches
The two NC (normally closed) audio/video switches (NC1,
NC2) are 3 switches that can pass signals that swing
below ground by as much as 1.5V. They were designed to
pass ground reference audio signals and dc restored
composite base-band signals (CVBS) including negative
synchronizing pulse with minimal insertion loss and very low
distortion and degradation.
The -3dB bandwidth into 75 is 338MHz (Figure 17).
Crosstalk between NC1 and NC2 @ 4MHz is -78dB
(Figure 16) which allows composite video to be routed
through one switch and mono-audio through the other switch
with little interference.
The recommended maximum signal range is from -1.5V to
1.5V. You can apply positive signals greater than 1.5V but
the rON resistance of the switch increases rapidly above
1.5V. The signal should not be allowed to exceed the VDD
rail or swing more negative than -1.5V.
Over a signal range of ±1V (0.707Vrms) with VDD >2.7V,
these switches have an extremely low rON resistance
variation. They can pass a ground referenced audio signal
with very low distortion (<0.06% THD+N) when delivering
15.6mW into a 32headphone speaker load. See Figures
10, 11, 12, and 13 THD+N performance curves.
Figures 8 and 9 shows the vector scope plots of a standard
NTSC color bar signal at both the input (Figure 8) and output
(Figure 9) of the ISL54208. The plots show that except for a
little attentuation, due to switch RON and test fixture cabling,
there is virtually no degradation of the video waveform
through the switch.
FIGURE 9. VECTOR-SCOPE PLOT AFTER SWITCH
Figure 18 shows the differential gain (DG) and differential
phase (DP) plots at the output of the switch using an actual
NTSC composite video signal and a VM700A Video
Measurement Test Set. DG = 0.28% and DP = 0.04deg.
The NC switches are uni-directional switches. The
audio/video sources should be connected at the NC side of
the switch (pins 7 and 8) and the speaker load and video
receiver should be connected at the COM side of the switch
(pins 3 and 4).
The NC switches are active (turned ON) whenever the IN
voltage is  to 0.5V and the CTRL voltage to 1.4V.
Note: Whenever the NC switches are ON the USB
transceiver drivers need to be in the high impedance state or
static high or low state.
NO1 and NO2 USB Switches
The two NO (normally open) USB switches (NO1, NO2) are
5 bidirectional switches that were designed to pass highspeed USB differential signals in the range of ±0V to 400mV.
These switches have low capacitance and high bandwidth to
pass USB high-speed signals (480Mbps) with minimum
edge and phase distortion to meet high-speed USB 2.0 highspeed signal quality specifications. See Figure 14 for Highspeed Eye Pattern taken with switch in the signal path.
The maximum signal range for the USB switches is from
-1.5V to VDD. The signal voltage at NO1 and NO2 should
not be allow to exceed the VDD voltage rail or go below
ground by more than -1.5V.
The NO switches are active (turned ON) whenever the IN
voltage is to 1.4V.
FIGURE 8. VECTOR-SCOPE PLOT BEFORE SWITCH
9
Note: Whenever the NO switches are ON the audio and
video drivers need to be at ac or dc ground or floating to
keep from interfering with the data transmission.
FN6410.0
December 18, 2006
ISL54208
ISL54208 Operation
The discussion that follows will discuss using the ISL54208 in
the typical application shown in the block diagrams on
page 8.
VDD SUPPLY
The dc power supply connected at VDD (pin 1) provides the
required bias voltage for proper switch operation. The part
can operate with a supply voltage in the range of 1.8V to
5.5V.
In a typical USB/Audio/Video application for portable battery
powered devices the VDD voltage will come from a battery or
an LDO and be in the range of 2.7V to 3.6V. For best
possible USB full-speed operation (12Mbps) it is
recommended that the VDD voltage be 3.3V in order to get
a USB data signal level above 2.5V.
LOGIC CONTROL
The state of the ISL54208 device is determined by the
voltage at the IN pin (pin 2) and the CTRL pin (pin 10). Refer
to truth-table on page 2 of data sheet. These logic pins are
1.8V compatible with VDD in the range of 2.7V to 3.6V and
can be controlled by a standard processor.
ISL54208 part will be in the audio/video mode and the media
player audio and video drivers can drive the speaker and
video display.
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 NO1 and
NO2 5 switches are ON and the NC1 and NC2 3
audio/video switches are OFF (high impedance).
When a USB cable from a computer or USB hub is
connected at the common connector, the processor will
sense the present of the 5V VBUS and drive the IN pin
voltage high. The ISL54208 part will go into the USB mode.
In USB mode, the computer or USB hub transceiver and the
media player USB transceiver are connected and digital data
will be able to be transmitted back and forth.
When the USB cable is disconnected, the processor 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/Video or Low Power Mode.
Low Power Mode
The CTRL pin is internally pulled low through a 4M
resistors to ground and can be left floating or tri-stated by the
processor. The CTRL control pin is only active when IN is
logic “0”.
If the IN pin = Logic “0” and CTRL pin = Logic “0,” the part
will be in the Low Power mode. In the Low Power mode, the
NCx switches and the NOx switches are OFF (high
impedance). In this state, the device draws typically 1nA of
current.
The IN pin does not have an internal pull-down resistor and
must not be allowed to float. It must be driven High or Low.
USING THE COMPUTER VBUS VOLTAGE TO DRIVE THE
“IN” PIN
The voltage at the IN pin can exceed the VDD voltage by as
much as 2.55V. This allows the VBUS voltage from a
computer or USB hub (4.4V to 5.25V) to drive the IN pin
while the VDD voltage is in the range of 2.7V to 3.6V. An
external pull-down resistor is required from the IN pin to
ground when directly driving the IN pin with the computer
VBUS voltage. See the section titled “USING THE
COMPUTER VBUS VOLTAGE TO DRIVE THE “IN’ PIN”.
External IN Pull-Down Resistor
Logic control voltage levels:
IN = Logic “0” (Low) when 0.5V
IN = Logic “1” (High) when IN 1.4V
CTRL = Logic “0” (Low) when 0.5V or floating.
CTRL = Logic “1” (High) when 1.4V
Audio/Video Mode
If the IN pin = Logic “0” and CTRL pin = Logic “1,” the part
will be in the Audio/Video mode. In Audio/Video mode the
NC1 and NC2 3 audio/video switches are ON and the NO1
and NO2 5 USB switches are OFF (high impedance).
When nothing is plugged into the common connector or a
audio/video jack is plugged into the common connector, the
processor 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 ISL54208 low. As long as the CTRL = Logic “1,” the
10
Rather than using a micro-processor to control the IN logic
pin you can directly drive the IN pin using the VBUS voltage
from the computer or USB hub. In order to do this you must
connected an external pull-down resistor from the IN pin to
ground.
When an audio/video jack or nothing is connected at the
common connector the external pull-down resistor will pull
the IN pin low putting the ISL54208 in the Audio/Video Mode
or Low Power 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
pull-down resistor and return to the Audio/Video Mode or
Low Power Mode depending on the condition of the CTRL
pin.
Note: The voltage at the IN pin can exceed the VDD voltage
by as much as 2.55V. This allows the VBUS voltage from a
computer or USB hub (4.4V to 5.25V) to drive the IN pin
while the VDD voltage is in the range of 2.7V to 3.6V.
FN6410.0
December 18, 2006
ISL54208
EXTERNAL SERIES RESISTOR AT IN LOGIC CONTROL
PIN
The ISL54208 contains a clamp circuit between IN and VDD.
Whenever the IN voltage is greater than the VDD voltage by
more than 2.55V, current will flow through this clamp circuitry
into the VDD power supply bus.
During normal USB operation, VDD is in the range of 2.7V to
3.6V and IN (VBUS voltage from computer or USB hub) is in
the range of 4.4V to 5.25V, the clamp circuit is not active and
no current will flow through the clamp into the VDD supply.
In a USB application, the situation can exist where the VBUS
voltage from the computer could be applied at the IN pin
before the VDD voltage is up to its normal operating voltage
range and current will flow through the clamp into the VDD
power supply bus. This current could be quite high when
VDD is OFF or at 0V and could potentially damage other
components connected in the circuit. In the application
circuit, a 22k resistor has been put in series with the IN pin
to limit the current to a safe level during this situation.
It is recommended that a current limiting resistor in the range
of 10k to 50k be connected in series with the IN pin. It will
have minimal impact on the logic level at the IN pin during
normal USB operation and protect the circuit during the time
VBUS is present before VDD is up to its normal operating
voltage.
Note: No external resistor is required in applications where
IN pin voltage will not exceed VDD by more than 2.55V.
Typical Performance Curves TA = +25°C, Unless Otherwise Specified
0.11
0.4
0.1
VDD = 2.6V
THD+N (%)
0.08
0.07
VDD = 2.7V
0.06
0.2
2.5VP-P
0.1
VDD = 3.6V
VDD = 3V
0.05
2VP-P
1VP-P
0
0.04
20
200
2K
FREQUENCY (Hz)
20K
20
FIGURE 10. THD+N vs SUPPLY VOLTAGE vs FREQUENCY
200
2K
FREQUENCY (Hz)
20K
FIGURE 11. THD+N vs SIGNAL LEVELS vs FREQUENCY
0.5
0.5
RLOAD = 32
FREQ = 1kHz
VDD = 3V
0.4
RLOAD = 32
FREQ = 1kHz
VDD = 3V
0.4
0.3
THD+N (%)
THD+N (%)
3VP-P
0.3
0.09
THD+N (%)
RLOAD = 32
VDD = 3V
RLOAD = 32
VLOAD = 0.707VRMS
0.2
0.3
0.2
0.1
0.1
0
0
0
0.5
1
1.5
2
2.5
3
OUTPUT VOLTAGE (VP-P)
FIGURE 12. THD+N vs OUTPUT VOLTAGE
11
3.5
0
10
20
30
40
50
OUTPUT POWER (mW)
FIGURE 13. THD+N vs OUTPUT POWER
FN6410.0
December 18, 2006
ISL54208
VOLTAGE (835mV/DIV)
Typical Performance Curves TA = +25°C, Unless Otherwise Specified (Continued)
TIME (10ns/DIV)
FIGURE 14. EYE PATTERN: 480Mbps WITH NOx SWITCHES IN THE SIGNAL PATH
1
0
NOx Switch
-10
-1
-20
-2
-30
NORMALIZED GAIN (dB)
NORMALIZED GAIN (dB)
0
-3
-4
-40
-50
-60
-70
-80
-90
RL = 50
VIN = 0.2VP-P to 2VP-P
1M
RL = 75
VIN = 0.2VP-P to 2VP-P
10M
100M
FREQUENCY (Hz)
FIGURE 15. FREQUENCY RESPONSE
12
1G
-110
0.001
0.01
3 6 10
0.1
1
FREQUENCY (MHz)
100
500
FIGURE 16. VIDEO TO AUDIO CROSSTALK
FN6410.0
December 18, 2006
ISL54208
GAIN (%)
1
NCx Switches
0
-1
-2
PHASE (DEG)
NORMALIZED GAIN (dB)
Typical Performance Curves TA = +25°C, Unless Otherwise Specified (Continued)
-3
-4
RL = 75
VIN = 0.2VP-P to 2VP-P
1M
10M
100M
FREQUENCY (Hz)
FIGURE 17.
1G
FIGURE 18.
Die Characteristics
SUBSTRATE POTENTIAL (POWERED UP):
GND (TDFN Paddle Connection: Tie to GND or Float)
TRANSISTOR COUNT:
98
PROCESS:
Submicron CMOS
13
FN6410.0
December 18, 2006
ISL54208
Ultra Thin Quad Flat No-Lead Plastic Package (UTQFN)
D
6
INDEX AREA
2X
A
L10.2.1x1.6A
B
N
10 LEAD ULTRA THIN QUAD FLAT NO-LEAD PLASTIC
PACKAGE
MILLIMETERS
E
SYMBOL
0.10 C
1
2X
2
0.10 C
TOP VIEW
C
A
0.05 C
1
MAX
A
0.45
0.50
0.55
-
A1
-
-
0.05
-
0.127 REF
-
b
0.15
0.20
0.25
5
D
2.05
2.10
2.15
-
E
1.55
1.60
1.65
-
e
SIDE VIEW
k
0.20
-
-
-
L
0.35
0.40
0.45
-
4xk
2
NX L
N
0.50 BSC
-
N
10
2
Nd
4
3
Ne
1
3

0
-
12
(DATUM B)
N-1
NX b
e
NOTES:
5
BOTTOM VIEW
CL
(A1)
L
5
e
SECTION "C-C"
TERMINAL TIP
C C
4
Rev. 3 6/06
0.10 M C A B
0.05 M C
3
(ND-1) X e
NX (b)
NOTES
A1
(DATUM A)
PIN #1 ID
NOMINAL
A3
0.10 C
SEATING PLANE
MIN
FOR ODD TERMINAL/SIDE
b
1. Dimensioning and tolerancing conform to ASME Y14.5-1994.
2. N is the number of terminals.
3. Nd and Ne refer to the number of terminals on D and E side,
respectively.
4. All dimensions are in millimeters. Angles are in degrees.
5. Dimension b applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
6. The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
either a mold or mark feature.
7. Maximum package warpage is 0.05mm.
8. Maximum allowable burrs is 0.076mm in all directions.
9. Same as JEDEC MO-255UABD except:
No lead-pull-back, "A" MIN dimension = 0.45 not 0.50mm
"L" MAX dimension = 0.45 not 0.42mm.
10. For additional information, to assist with the PCB Land Pattern
Design effort, see Intersil Technical Brief TB389.
2.50
1.75
0.05 MIN
L
2.00
0.80
0.275
0.10 MIN
DETAIL “A” PIN 1 ID
0.25
0.50
LAND PATTERN 10
14
FN6410.0
December 18, 2006
ISL54208
Thin Dual Flat No-Lead Plastic Package (TDFN)
L10.3x3A
2X
0.10 C A
A
10 LEAD THIN DUAL FLAT NO-LEAD PLASTIC PACKAGE
D
MILLIMETERS
2X
0.10 C B
E
B
//
A
C
SEATING
PLANE
D2
(DATUM B)
6
INDEX
AREA
0.10 C
0.08 C
A3
SIDE VIEW
7
8
MAX
NOTES
A
0.70
0.75
0.80
-
A1
-
-
0.05
-
0.20 REF
b
0.20
0.25
0.30
1
5, 8
D
2.95
3.0
3.05
-
D2
2.25
2.30
2.35
7, 8
E
2.95
3.0
3.05
-
E2
1.45
1.50
1.55
7, 8
e
0.50 BSC
-
k
0.25
-
-
-
L
0.25
0.30
0.35
8
N
10
2
Nd
5
3
Rev. 3 3/06
NOTES:
2
1. Dimensioning and tolerancing conform to ASME Y14.5-1994.
2. N is the number of terminals.
NX k
3. Nd refers to the number of terminals on D.
4. All dimensions are in millimeters. Angles are in degrees.
E2
E2/2
5. Dimension b applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
6. The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
either a mold or mark feature.
NX L
N
N-1
NX b
e
(Nd-1)Xe
REF.
BOTTOM VIEW
5
7. Dimensions D2 and E2 are for the exposed pads which provide
improved electrical and thermal performance.
0.10 M C A B
8. Nominal dimensions are provided to assist with PCB Land
Pattern Design efforts, see Intersil Technical Brief TB389.
9. Compliant to JEDEC MO-229-WEED-3 except for D2
dimensions.
CL
NX (b)
NOMINAL
D2/2
(DATUM A)
8
MIN
A3
6
INDEX
AREA
TOP VIEW
SYMBOL
(A1)
L1
5
9 L
e
SECTION "C-C"
C C
TERMINAL TIP
FOR ODD TERMINAL/SIDE
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9001 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
15
FN6410.0
December 18, 2006
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