LM4868MT National Semiconductor, LM4868MT Datasheet - Page 4

• Manufacturer Part Number: LM4868MT
• Description: Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coupling Capacitor Stereo Headphone Function
• Manufacturer: National Semiconductor

www.national.com
THD+N
PSRR
X
SNR
V
P
V
THD+N
PSRR
X
SNR
Symbol
Symbol
TALK
Electrical Characteristics for Bridged-Mode Operation
OS
O
OUT
TALK
The following specifications apply for V
Electrical Characteristics for Single-Ended Operation
The following specifications apply for V
Note 3: 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 which
guarantee specific performance limits. This assumes that the device operates within the Operating Ratings. Specifications are not guaranteed for parameters where
no limit is given. The typical value however, is a good indication of device performance.
Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
allowable power dissipation is P
Information section or the Absolute Maximum Ratings section.
Note 5: Human body model, 100pF discharged through a 1.5kΩ resistor.
Note 6: Machine model, 220pF–240pF discharged through all pins.
Note 7: The given θ
Note 8: The given θ
Note 9: The given θ
Note 10: The given θ
Note 11: All voltages are measured with respect to the ground (GND) pins, unless otherwise specified.
Note 12: Typicals are measured at 25˚C and represent the parametric norm.
Note 13: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). Datasheet min/max specification limits are guaranteed by design, test, or
statistical analysis.
Note 14: The quiescent power supply current depends on the offset voltage when a practical load is connected to the amplifier.
Note 15: Output power is measured at the device terminals.
Note 16: When driving 3Ω or 4Ω loads and operating on a 5V supply, the LM4868LQ and LM4868MTE must be mounted to a circuit board that has a minimum of
2.5in
Note 17: See Application Information section ’Single-Ended Output Power Performance and Measurement Considerations’ for more information.
2
of exposed, uniterrupted copper area connected to the LLP or TSSOP package’s exposed DAP.
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
Channel Separation
Signal To Noise Ratio
Output Offset Voltage
Output Power
Output Voltage Swing
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
Channel Separation
Signal To Noise Ratio
JA
JA
JA
JA
is for an LM4868 packaged in an MXA20A with the Exposed-DAP soldered to an exposed 2in
is for an LM4868 packaged in an MXA20A with the Exposed-DAP soldered to an exposed 1in
is for an LM4868 packaged in an MXA20A with the Exposed-DAP not soldered to printed circuit board copper.
is for an LM4868 packaged in an LQA24A with the Exposed-DAP soldered to an exposed 2in
Parameter
Parameter
DMAX
= (T
JMAX
DD
DD
− T
= 5V unless otherwise specified. Limits apply for T
= 5V unless otherwise specified. Limits apply for T
A
)/θ
20Hz ≤ f ≤ 20kHz, A
V
C
f = 1 kHz, C
V
JA
DD
DD
B
V
THD = 0.5%, f = 1kHz, R
THD+N = 1%, f = 1kHz, R
17)
THD+N = 1%, f = 1kHz, R
THD+N = 1%, f = 1kHz, R
THD+N = 10%, f = 1kHz, R
THD+N = 10%, f = 1kHz, R
THD = 0.05%, R
A
R
C
f = 1kHz
f = 1kHz, C
V
. For the LM4868, T
= 2.2µF
IN
V
DD
L
B
LM4868MTE, R
LM4868LQ, R
LM4868, R
= 5V, V
= 5V, P
= −1, P
= 32Ω
= 2.2µF, V
= 0V
= 5V, P
B
RIPPLE
O
O
B
= 2.2µF
= 1.1W, R
O
L
= 75mW, 20 Hz ≤ f ≤ 20kHz,
= 2.2µF
RIPPLE
= 340mW, R
= 8Ω, P
Conditions
Conditions
L
L
4
JMAX
= 200 mV
L
= 4Ω, P
VD
= 5kΩ
= 4Ω, P
= 2
= 200mV
= 150˚C. For the θ
L
O
= 8Ω
= 1W
L
O
L
L
L
RMS
L
= 32Ω
O
= 2W
L
L
= 8Ω (Note
= 16Ω
= 32Ω
= 8Ω
= 16Ω
= 32Ω
= 2W
RMS
, R
L
,
JMAX
= 8Ω,
JA
, θ
s for different packages, please see the Application
JA
, and the ambient temperature T
(Notes 3, 11)
(Notes 3, 11) (Continued)
(Note 12)
2
2
A
A
(Note 12)
Typical
2
Typical
area of 1oz printed circuit board copper.
area of 1oz printed circuit board copper.
= 25˚C.
= 25˚C.
area of 1oz printed circuit board copper.
180
165
208
114
0.2
85
88
52
60
94
0.3
0.3
0.3
67
80
97
5
1
LM4868
LM4868
(Note 13)
(Note 13)
Limit
Limit
50
75
A
. The maximum
mV (max)
mW (min)
(Limits)
(Limits)
Units
Units
V
mW
mW
mW
mW
mW
dB
dB
dB
dB
dB
dB
%
%
%
%
P-P