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PDF NLAS54404 Data sheet ( Hoja de datos )
| Número de pieza | NLAS54404 | |
| Descripción | Ultra-Low THD Stereo SPDT Switch | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NLAS54404
Ultra-Low THD Stereo SPDT
Switch with Independent
Channel Selects
The NLAS54404 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 2.0 VRMS while operating from a single 3.3 V
DC supply. The digital logic inputs are 1.8 V logic−compatible. It is
used in DC−coupled ground-referenced applications.
With −118 dB THD+N performance with a 2.0 VRMS signal into
20 kW load, superior signal muting, high PSRR and very flat
frequency response, the NLAS54404 meets the exacting requirements
of consumer and professional audio engineers.
Features
• Dual SPDT Switch or 2-to-1 MUX
• Independent Channel Selects
• 2.0 VRMS Signal Switching from 3.3 V Supply
• −118 dB THD+N into 20 kW Load at 2.0 VRMS
• −108 dB THD+N into 32 W Load at 3.9 mW
• Signal to Noise Ratio: > 119 dBV
• ±0.003 dB Insertion Loss at 1 kHz, 20 kW Load
• ±0.01 dB Gain Variation 20 Hz to 20 kHz
• 113 dB Signal Muting into 32 W Load
• 126 dB PSRR 20 Hz to 20 kHz
• Single Supply Operation: 3.3 V
• 12−Ball WLCSP, 1.6 mm x 1.2 mm
• This Device is Pb−Free, Halogen Free/BFR Free and is 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
www.onsemi.com
WLCSP12
FC SUFFIX
CASE 567LG
MARKING DIAGRAM
AAA
AYWW
A = Assembly Location
Y = Year
WW = Work Week
ORDERING INFORMATION
Device
Package Shipping†
NLAS54404FCTAG
WLCSP12 3000 / Tape
(Pb−Free)
& Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2015
August, 2015 − Rev. 0
1
Publication Order Number:
NLAS54404/D
1 page  
NLAS54404
DC ELECTRICAL CHARACTERISTICS (Voltages referenced to GND)
3.3 V Supply: VDD = +3.0 V to +3.6 V, GND = 0 V, VSIGNAL = 2.0 VRMS, RLOAD = 20 kW , f = 1 kHz, VSELH = VMUTEH = 1.4 V, VSELL =
VMUTEL = 0.5 V, CAP_SS = 0.1 mF, (Note 2), Unless otherwise specified.
Parameter
Test Conditions
Temp Min
Max
Supply (V) (°C) (Notes 3, 4) Typ (Notes 3, 4) Units
ANALOG SWITCH CHARACTERISTICS
Analog Signal Range,
VANALOG
ON−Resistance, rON
VDD = 3.3 V, IR or IL = 80 mA, VLx or VRx
= −2.828 V to +2.828 V (See Figure 6)
3.3 Full −
3.3 25 −
Full −
2.0
2.1
2.3
− VRMS
−W
−
rON Matching Between VDD = 3.3 V, IR or IL = 80 mA, VLx or VRx
3.3
25
−
Channels, DrON
= Voltage at max rON over −2.828 V to
+2.828 V (Note 7)
Full −
0.0042
0.043
−
−
W
rON Flatness,
rFLAT(ON)
VDD = 3.3 V, IR or IL = 80 mA, VLx or VRx
3.3
25
−
= −2.828 V, 0 V, +2.828 V (Note 5)
Full −
0.021
0.051
0.055
−
W
L, R, Lx, Rx Pull−
down
Resistance
VDD = 3.6 V, VLx or VRx = −2.83 V, 2.83 V,
VL or VR = −2.82 V, 2.83 V, VAC/DC = 0 V,
VMUTE = 3.6 V, measure current,
calculate resistance.
3.6
25 225
Full −
300
345
375 kW
−
DYNAMIC CHARACTERISTICS
THD+N
VSIGNAL = 2 VRMS, f = 1 kHz, A−weighted
3.3
25
− < −118
−
filter, RLOAD = 20 kW
dB
VSIGNAL = 1.9 VRMS, f = 1 kHz,
A−weighted filter, RLOAD = 20 kW
25 − < −117 −
VSIGNAL = 1.8 VRMS, f = 1 kHz,
A−weighted filter, RLOAD = 20 kW
25 − < −116 −
VSIGNAL = 0.707 VRMS, f = 1 kHz,
A−weighted filter, RLOAD = 32 W
25 − < −108 −
SNR
f = 20 Hz to 20 kHz, A−weighted filter,
3.3 25 − > 119
inputs grounded, RLOAD = 20 kW or 32 W
− dBV
Insertion Loss, GON
f = 1 kHz, RLOAD = 20 kW
3.3 25 − ±0.003 −
dB
Gain vs Frequency, Gf f = 20 Hz to 20 kHz, RLOAD = 20 kW, ref-
3.3
25
−
±0.01
−
dB
erence to GON at 1 kHz
Stereo Channel Imbal-
ance L1 and R1, L2
and R2
f = 20 Hz to 20 kHz, RLOAD = 20 kW
3.3 25 − ±0.006 −
dB
OFF−Isolation (Muting)
f = 20 Hz to 22 kHz, L = R = 2 VRMS,
RLOAD = 20 kW, MUTE = 3.3 V,
SEL_L/SEL_R = “X”
3.3 25 −
105
− dB
Crosstalk (Channel−
to− Channel)
f = 20 Hz to 22 kHz, VL or VR =
0.7 VRMS, RLOAD = 32 W
RL = 20 kW, f = 20 Hz to 20 kHz,
VSIGNAL = 2 VRMS, signal source
impedance = 20 W, (Note 8)
25 −
3.3 25 −
112
90
−
− dB
RL = 32 W, f = 20 Hz to 20 kHz,
VSIGNAL = 0.7 VRMS, signal source
impedance = 20 W, (Note 8)
25 −
112
−
PSRR
f = 1 kHz, VSIGNAL= 100 mVRMS,
inputs grounded
3.3 25 −
131
− dB
2. VIN = input voltage to perform proper function.
3. The algebraic convention, whereby the most negative value is a minimum and the most positive a maximum, is used in this data sheet.
4. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by charac-
terization and are not production tested.
5. Flatness is defined as the difference between maximum and minimum value of ON−resistance at the specified analog signal voltage points.
6. Limits established by characterization and are not production tested.
7. rON matching between channels is calculated by subtracting the channel with the highest max rON value from the channel with lowest max
rON value.
8. Crosstalk is inversely proportional to source impedance.
www.onsemi.com
5
5 Page 
NLAS54404
Logic Levels:
MUTE = Logic “0” (Low) when v 0.5 V
MUTE = Logic “1” (High) when w 1.4 V or floating
SEL = Logic “0” (Low) when v 0.5 V
SEL = Logic “1” (High) when w 1.4 V
DC Coupled Operation
The Audio CODEC drivers can be directly coupled to the
NLAS54404 when the audio signals from the drivers are
ground referenced or do not have a significant DC offset
voltage, < 50 mV.
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 10). To prevent forward
biasing these diodes, VDD must be applied before any input
signals, and the signal voltages must remain between VDD
and −3 V and the logic voltage must remain between VDD
and ground.
If these conditions cannot be guaranteed, then precautions
must be implemented to prohibit the current and voltage at
the logic pin and signal pins from exceeding the maximum
ratings of the switch. The following two methods can be
used to provide additional protection to limit the current in
the event that the voltage at a signal pin goes below ground
by more than −3 V or above the VDD rail and the logic pin
goes below ground or above the VDD rail.
Logic inputs can be protected by adding a 1 kW resistor in
series with the logic input (see Figure 10). The resistor limits
the input current below the threshold that produces
permanent damage, and the sub−microamp input current
produces an insignificant voltage drop during normal
operation.
This method is not acceptable for the signal path inputs.
Adding a series resistor to the switch input defeats the
purpose of using a low rON switch. Connecting Schottky
diodes to the signal pins, as shown in Figure 10 will shunt the
fault current to the supply or to ground thereby protecting the
switch. These Schottky diodes must be sized to handle the
expected fault current and to clamp when the voltage reaches
the overvoltage limit.
Figure 10. OVERVOLTAGE PROTECTION
High−Frequency Performance
In 50 W systems, the NLAS54404 has a −3 dB bandwidth
of 250 MHz (see Figure 28). The frequency response is very
consistent over varying analog signal levels.
An OFF−switch acts like a capacitor and passes higher
frequencies with less attenuation, resulting in signal
feed−through from a switch’s input to its output.
OFF−Isolation is the resistance to this feed−through, while
crosstalk indicates the amount of feed−through from one
switch to another. Figure 29 details the high OFF−Isolation
and crosstalk rejection provided by this part. At 1 MHz,
Off−Isolation is about 64 dB in 50 W systems, decreasing
approximately 20 dB per decade as frequency increases.
Higher load impedances decrease OFF−Isolation and
crosstalk rejection due to the voltage divider action of the
switch off impedance and the load impedance.
www.onsemi.com
11
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| PDF Descargar | [ Datasheet NLAS54404.PDF ] | |
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