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PDF ISL54405 Data sheet ( Hoja de datos )
| Número de pieza | ISL54405 | |
| Descripción | CD/MP3 Quality Stereo 2:1 Multiplexer | |
| Fabricantes | Intersil | |
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CD/MP3 Quality Stereo 2:1 Multiplexer with Click and
Pop Elimination
ISL54405
The Intersil ISL54405 is a single supply, bidirectional, dual
single-pole/double-throw (SPDT) ultra low distortion, high
OFF-Isolation analog switch that can pass analog signals that
are positive and negative with respect to ground. It is primarily
targeted at consumer and professional audio switching
applications such as computer sound cards and home theater
products. The inputs can accommodate ground referenced
signals up to 2VRMS while operating from a single 3.3V or 5V DC
supply. The digital logic inputs are 1.8V logic-compatible when
using a single 3.3V or 5V supply. It can be used in both AC or DC
coupled ground referenced applications.
The ISL54405 features a soft-switch feature and click/pop
circuitry at each signal pin that eliminates clicks and pops
associated with power-up/down conditions of the preceding
amplifier outputs.
With -106dB THD+N performance with a 2VRMS signal into
20k load, superior signal muting, high PSRR and very flat
frequency response, the ISL54405 meets the exacting
requirements of consumer and professional audio engineers.
The ISL54405 is available in 16 Ld TSSOP, 16 Ld 3mmx3mm
TQFN, and 16 Ld 2.6mmx1.8mm µTQFN packages. It’s specified
for operation over the -40°C to +85°C temperature range.
Related Literature
• TB363 “Guidelines for Handling and Processing Moisture
Sensitive Surface Mount Devices (SMDs)”
• AN557 “Recommended Test Procedures for Analog
Switches”
Features
• Clickless audio switching
• 2 switches
• Switch type SPDT or 2 to 1 MUX
• 2VRMS signal switching from 3.3V or 5V supply
• -106dB THD+N into 20k load at 2VRMS
• -108dB THD+N into 32 load at 3.9mW
• Signal to noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >124dBV
• ±0.01dB insertion loss at 1kHz, 20k load
• ±0.007dB gain variation 20Hz to 20kHz
• 125dB signal muting into 20k load
• 90dB PSRR 20Hz to 20kHz
• Single supply operation . . . . . . . . . . . . . . . . . . . . . . . . . 3.3V or 5V
• Available in 16 Ld TSSOP, 16 Ld TQFN, and 16 Ld µTQFN
• Pb-Free (RoHS compliant)
Applications
• Computer sound cards
• Home theater audio products
• SACD/DVD audio
• DVD player audio output switching
• Headsets for MP3/cellphone switching
• Hi-Fi audio switching application
DIR_SEL
AC/DC
MUTE
SEL
L
R
5V_Supply
ISL54405
LOGIC
AND
CLICK/POP
CONTROL
VDD
CAP_SS
L1
L2
R1
R2
May 6, 2014
FN6699.2
GND
For 5V operation connect the 5V_Supply pin to 5V and float the
VDD pin. For 3.3V operation connect the VDD pin to 3.3V and float
the 5V_Supply pin.
FIGURE 1. ISL54405 BLOCK DIAGRAM
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2008, 2014. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL54405
Electrical Specifications 3.3V Supply: VDD = +3.0V to +3.6V, GND = 0V, VDIR_SEL = VAC/DC = GND, V5V_SUPPLY = Float,
VSIGNAL = 2VRMS, RLOAD = 20kΩ , f = 1kHz, VSELH = VMUTEH = 1.4V, VSELL = VMUTEL = 0.5V, CAP_SS = 0.1µF, (Note 10), Unless otherwise specified.
PARAMETER
TEST CONDITIONS
SUPPLY TEMP
MIN
MAX
(V) (°C) (Notes 11, 12) TYP (Notes 11, 12) UNITS
Gain vs Frequency, Gf
f = 20Hz to 20kHz, RLOAD = 20k, reference to GON
at 1kHz
3.3
25
- ±0.007 -
dB
Stereo Channel Imbalance f = 20Hz to 20kHz, RLOAD = 20k
L1 and R1, L2 and R2
3.3 25
- ±0.003 -
dB
OFF-Isolation (Muting)
f = 20Hz to 22kHz, L = R = 2VRMS, RLOAD = 20k, 3.3, 5 25
-
120
-
dB
MUTE = AC/DC = 3.3V, DIR_SEL = GND, SEL = “X”
f = 20Hz to 22kHz, L1, R1, L2, R2 = 2VRMS,
RLOAD = 20kMUTE = AC/DC = DIR_SEL = 3.3V,
SEL = “X”
25 - 120 - dB
f = 20Hz to 22kHz, VL or VR = 0.7VRMS, RLOAD = 32
25 - 125 - dB
Crosstalk (Channel-to-
RL = 20k, f = 20Hz to 20kHz, VSIGNAL = 2VRMS,
3.3 25
-
120
-
dB
Channel)
signal source impedance = 20, Note 16
RL = 32, f = 20Hz to 20kHz, VSIGNAL = 0.7VRMS,
signal source impedance = 20, Note 16
25 - 120 - dB
PSRR
Bandwidth, -3dB
ON to Mute Time,
TTRANS-OM
Mute to ON Time,
TTRANS-MO
Turn-ON Time, tON
f = 1kHz, VSIGNAL= 100mVRMS, inputs grounded
3.3, 5 25
-
110
-
dB
f = 20kHz, VSIGNAL= 100mVRMS, inputs grounded
25 - 90 - dB
RLOAD = 50
3.3 25 - 230 - MHz
CAP_SS = 0.1µF
3.3 25
-
50
-
ns
CAP_SS = 0.1µF
(Selectable via soft-start capacitor value)
3.3 25
-
58
- ms
VDD = 3.3V, VLx or VRx = 1.5V, VMUTE = 0V, RL = 20k 3.3
25
-
45
-
µs
(See Figure 2)
Turn-OFF Time, tOFF
VDD = 3.3V, VLx or VRx = 1.5V, VMUTE = 0V, RL = 20k 3.3
25
-
50
-
ns
(See Figure 2)
Break-Before-Make Time VDD = 3.6V, VLx or VRx = 1.5V, VMUTE = 0V, RL = 20k 3.6
25
-
45
-
µs
Delay, tD
(See Figure 3)
OFF-Isolation
RL = 50, f = 1MHz, VL or VR = 1VRMS (See Figure 4) 3.3
25
-
100
-
dB
Crosstalk (Channel-to-
RL = 50, f = 1MHz, VL or VR = 1VRMS (See Figure 6) 3.3
25
-
70
- dB
Channel)
Lx, Rx OFF Capacitance,
f = 1MHz, VLx or VRx = VL or VR = 0V (See Figure 7)
3.3
25
-
10
- pF
COFF
L, R ON Capacitance,
f = 1MHz, VLx or VRx = VCOM = 0V (See Figure 7)
3.3 25
-
27
- pF
CCOM(ON)
POWER SUPPLY CHARACTERISTICS
Power Supply Range, VDD 5V_Supply = Float
3.3 Full
3
- 3.6 V
Power Supply Range,
5V_Supply
VDD = Float
5 Full
4.5
-
5.5 V
Positive Supply Current, I+ VDD = +3.6V, VMUTE = 0V, VSEL = 0V or VDD
3.6 25
Full
-
-
54 65 µA
59 - µA
VDD = +3.6V, VMUTE = VDD, VSEL = 0V or VDD
3.6 25
3.6 Full
-
-
14 18 µA
15 - µA
VDD = +3.6V, VMUTE = 0V, VSEL = 1.8V
3.6 25
3.6 Full
-
-
55 65 µA
58 - µA
DIGITAL INPUT CHARACTERISTICS
Input Voltage Low, VSELL,
VMUTEL
3.3, 5 Full
-
- 0.5 V
Submit Document Feedback
5
FN6699.2
May 6, 2014
5 Page 
ISL54405
AC Coupled or DC Coupled Operation
The Audio CODEC drivers can be directly coupled to the
ISL54405 when the audio signals from the drivers are ground
referenced or do not have a significant DC offset voltage,
<50mV. Otherwise, the signal should be AC coupled to the
ISL54405 part.
CLICK AND POP OPERATION
The ISL54405 has special circuitry to eliminate click and pops
in the speakers during power-up and power-down of the Audio
CODEC Drivers and during removal and insertion of
headphones.
A different click and pop scheme is required depending on
whether the audio CODEC drivers are AC coupled or DC
coupled to the inputs of the ISL54405 part.
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 down of the driver a transient can be coupled into
the speaker load through the DC blocking capacitor (see the
“Sound Card AC Coupled Application Block Diagrams” on
page 8).
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 audio mode or there is no low
impedance path to discharge the capacitor voltage at the input
of the switch, before turning on the switch, a transient
discharge will occur in the speaker, generating a click and pop
noise.
Proper elimination of a click/pop transient at the speaker load
while powering up or down of the audio driver requires that the
ISL54405 have its C/P shunts activated on the source side of
the switch and then placed in mute mode. This allows the
transient 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 C/P shunt circuitry, the
switches can be turned on and connected through to the
speaker loads without generating an undesirable click/pop in
the speakers.
With a typical DC blocking capacitor of 220µF and the C/P
shunt circuitry designed to have a resistance of 40allowing
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 26 and 27 on
page 15.
CLICK AND POP ELIMINATION WHEN CONNECTED TO
HIGH IMPEDANCE SOURCE AND LOAD
By design, in order to flatten the RON resistance of the switch
across the signal range (±3V) a current gets added to the
signal path. When the ISL54405 part is connected to a high
impedance source (i.e. AC coupled to the input of the switch)
and a high impedance load, (such as the impedance of a 20k
to 100k preamplifier stage) a DC offset voltage will be
present on the signal line in the range of 35mV to 135mV.
When the switch is turned off, this offset voltage gets pulled to
ground. During switching, this change in the offset voltage can
cause a click and pop noise to be heard in the downstream
speaker.
Placing a 1kresistor from the output of the switch to ground
will lower the offset voltage to around 1.5mV, thereby
effectively eliminating the click and pop noise. The 1k
resistor is small enough to reduce the voltage offset
significantly while not increasing power dissipation
dramatically. Power consumption will need to be considered
when using a smaller impedance under this scenario.
When connected to a low impedance load such as
headphones (32), the current added to the signal line results
in a minimal DC offset voltage on the signal line and does not
cause click and pop noise when the switch is turned off.
DC COUPLED CLICK AND POP OPERATION
The ISL54405 can pass ground referenced audio signals which
allows it to be directly connected to audio drivers that output
ground referenced audio signals, eliminating the need for a DC
blocking capacitor.
Audio drivers that swing around ground, however, do generate
some DC offset, from a few millivolts to tens of millivolts.
When switching between audio channels or muting the audio
signal, these small DC offset levels of the drivers can generate
a transient that can cause unwanted clicks and pops in the
speaker loads.
In a DC coupled application the C/P shunt resistors placed at
the source side of the switch have no effect in eliminating the
transients at the speaker loads when transitioning in and out
of the mute state or switching between channels. In fact,
having these C/P shunts active on the source side
unnecessarily increases the power consumption. So, for DC
coupled connection, the C/P shunt circuitry should not be
applied at the source (driver) side of the switch.
For DC coupled applications the ISL54405 has a special
soft-start feature that slowly ramps the DC offset voltage from
the audio driver to the speaker load when turning on a switch
channel. The ramp rate at the load is determined by the
capacitor value connected at the CAP_SS pin.
Lab experimentation has shown that if you can slow the
voltage ramp rate at the speaker to <10V/s, you can eliminate
click/pop noise in a speaker. A soft-start capacitor value of
0.1µF provides for 4.5V/s ramp rate and is recommended. See
Figures 28 and 29 on page 16. See “MUTE to ON” on page 9
for more detail of how soft-start works.
Supply Sequencing and Overvoltage
Protection
With any CMOS device, proper power supply sequencing is
required to protect the device from excessive input currents
which might permanently damage the IC. All I/O pins contain
ESD protection diodes or diode stacks from the pin to VDD and
to GND (see Figure 9). To prevent forward biasing these diodes,
Submit Document Feedback 11
FN6699.2
May 6, 2014
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ISL54405.PDF ] | |
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