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LM4917MT 데이터시트 PDF




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부품번호 LM4917MT 기능
기능 Ground-Referenced/ 95mW Stereo Headphone Amplifier
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LM4917MT 데이터시트, 핀배열, 회로
November 2004
LM4917
Ground-Referenced, 95mW Stereo Headphone Amplifier
General Description
The LM4917 is a stereo, output capacitor-less headphone
amplifier capable of delivering 95mW of continuous average
power into a 16load with less than 1% THD+N from a
single 3V power supply.
The LM4917 provides high quality audio reproduction with
minimal external components. A ground referenced output
eliminates the output coupling capacitors typically required
by single-ended loads, reducing component count, cost and
board space consumption. This makes the LM4917 ideal for
mobile phones and other portable equipment where board
space is at a premium. Eliminating the output coupling ca-
pacitors also improves low frequency response.
The LM4917 operates from a single 1.4V to 3.6V power
supply, features low 0.02% THD+N and 70dB PSRR. Inde-
pendent right/left channel low-power shutdown controls pro-
vide power saving flexibility for mono/stereo applications.
Superior click and pop suppression eliminates audible tran-
sients during start up and shutdown. Short circuit and ther-
mal overload protection protects the device during fault con-
ditions.
Key Specifications
j Improved PSRR at 1kHz
j Power Output at VDD = 3V,
RL = 16, THD % 1%
j Shutdown Current
70dB (typ)
95mW (typ)
0.01µA (typ)
Features
n Ground referenced outputs
n High PSRR
n Available in space-saving TSSOP package
n Ultra low current shutdown mode
n Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n 1.4 – 3.6V operation
n No output coupling capacitors, snubber networks,
bootstrap capacitors
n Shutdown either channel independently
Applications
n Notebook PCs
n Desktop PCs
n Mobile Phone
n PDAs
n Portable electronic devices
Block Diagram
200893B8
FIGURE 1. Circuit Block Diagram
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200893
www.national.com




LM4917MT pdf, 반도체, 판매, 대치품
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
Storage Temperature
Input Voltage
Power Dissipation (Note 3)
ESD Susceptibility (Note 4)
ESD Susceptibility (Note 5)
4.0V
−65˚C to +150˚C
-0.3V to VDD + 0.3V
Internally Limited
2000V
200V
Junction Temperature
Thermal Resistance
θJC (TSSOP)
θJA (TSSOP)
Operating Ratings
Temperature Range
TMIN TA TMAX
Supply Voltage (VDD)
150˚C
40˚C/W
109˚C/W
−40˚C TA 85˚C
1.4V VCC 3.6V
Electrical Characteristics VDD = 3V (Notes 1, 2)
The following specifications apply for VDD = 3V, AV = 1, and 16load unless otherwise specified. Limits apply to TA = 25˚C.
Symbol
Parameter
Conditions
LM4917
Units
Typ Limit (Limits)
(Note 6) (Notes 7,
8)
IDD
Quiescent Power Supply Current VIN = 0V, IO = 0A, both channels
11 20 mA (max)
enabled
VIN = 0V, IO = 0A, one channel
enabled
9
mA
ISD Shutdown Current
VSD_LC = VSD_RC = GND
0.01
1 µA (max)
VOS
Output Offset Voltage
RL = 32
1 10 mV (max)
PO Output Power
THD+N = 1% (max); f = 1kHz, RL =
95
50 mW (min)
16
THD+N = 1% (max); f = 1kHz, RL =
32
82
mW
THD+N
Total Harmonic Distortion + Noise PO = 50mW, f = 1kHz, RL = 32
(A-weighted) single channel
0.02
%
PSRR
Power Supply Rejection Ratio
VRIPPLE = 200mV sine p-p,
f = 1kHz
70
dB
f = 20kHz
55
SNR
VIH
VIL
TWU
XTALK
IL
Signal-to-Noise Ratio
Shutdown Input Voltage High
RL = 32, POUT = 20mW, f = 1kHz
Shutdown Input Voltage Low
Wake Up Time From Shutdown
Crosstalk
Input Leakage Current
RL = 16, PO = 1.6mW, f = 1kHz
100
VIH =
0.7*CPVDD
VIL =
0.3*CPVDD
339
70
±0.1
dB
V (min)
V (max)
µs (max)
dB
nA
Note 1: All voltages are measured with respect to the GND pin unless otherwise specified.
Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions that
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given; however, the typical value is a good indication of device performance.
Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature, TA. The maximum
allowable power dissipation is PDMAX = (TJMAX - TA) / θJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4917, see power
de-rating currents for more information.
Note 4: Human body model, 100pF discharged through a 1.5kresistor.
Note 5: Machine Model, 220pF-240pF discharged through all pins.
Note 6: Typicals are measured at 25˚C and represent the parametric norm.
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9: If the product is in shutdown mode and VDD exceeds 3.6V (to a max of 4V VDD) then most of the excess current will flow through the ESD protection circuits.
If the source impedance limits the current to a max of 10mA, then the part will be protected. If the part is enabled when VDD is above 4V circuit performance will
be curtailed or the part may be permanently damaged.
Note 10: Human body model, 100pF discharged through a 1.5kresistor.
www.national.com
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LM4917MT 전자부품, 판매, 대치품
Typical Performance Characteristics (Continued)
THD+N vs Frequency
VDD = 3.0V, RL = 16, PO = 50mW
THD+N vs Frequency
VDD = 3.0V, RL = 32, PO = 5mW
20089333
THD+N vs Frequency
VDD = 3.0V, RL = 32, PO = 10mW
20089332
THD+N vs Frequency
VDD = 3.0V, RL = 32, PO = 25mW
20089331
Gain Flatness vs Frequency
RIN = 20k, CIN = 0.39µF
20089328
Output Power vs Supply Voltage
RL = 16
20089354
7
20089347
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LM4917MT

Ground-Referenced/ 95mW Stereo Headphone Amplifier

National Semiconductor
National Semiconductor

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