LM4859SP National Semiconductor, LM4859SP Datasheet - Page 9

• Manufacturer Part Number: LM4859SP
• Description: Audio Amp Headphone/Speaker 2-CH Stereo 1.6W Class-AB 28-Pin LLP EP T/R
• Manufacturer: National Semiconductor

Specifications of LM4859SP

• Package: 28LLP EP
• Function: Headphone/Speaker
• Amplifier Type: Class-AB
• Total Harmonic Distortion Noise: 0.04@32Ohm@15mW|0.05@8Ohm@400mW %
• Typical Psrr: 86 dB
• Output Signal Type: Differential|Single
• Output Type: 2-Channel Stereo
• Maximum Input Offset Voltage: 40@5V mV
• Maximum Load Resistance: 32 Ohm

V
V
Symbol
IH
IL
Control Interface Electrical Characteristics
The following specifications apply for V
apply for T
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 which
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 T
allowable power dissipation is P
3, 8, or 13 with V
Note 4: Human body model, 100pF discharged through a 1.5kΩ resistor.
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: Shutdown current and supply current are measured in a normal room environment. All digital input pins are connected to I
Note 10: The given θ
Note 11: “0dB gain” refers to the volume control gain setting of M
Note 12: The given θ
External Components Description
1.
2.
3.
4.
5.
6.
Components
Digital Input High Voltage
Digital Input Low Voltage
A
= 25˚C.
C
R
C
DD
C
C
C
OUT
3D
3D
IN
S
B
= 5V, 8Ω stereo loudspeakers and 32Ω stereo headphones, the total power dissipation is 1.348W. θ
JA
JA
Parameter
is for an LM4859SP mounted on a PCB with a 2in
is for an LM4859TL mounted on a PCB with a 2in
DMAX
This is the input coupling capacitor. It blocks the DC voltage and couples the input signal to the
amplifier’s input terminals. C
Impedance) at f
This is the supply bypass capacitor. It filters the supply voltage applied to the V
reduce the noise at the V
This is the BYPASS pin capacitor. It filters the V
PSRR.
This is the output coupling capacitor. It blocks the DC voltage and couples the output signal to the
speaker load R
This resistor sets the gain of the National 3D effect. Please refer to the National 3D Enhancement
section for information on selecting the value of R
This capacitor sets the frequency at which the National 3D effect starts to occur. Please refer to the
National 3D Enhancement section for information on selecting the value of C
= (T
JMAX
- T
A
DD
) / θ
L
C
. C
= 5V and V
JA
= 1/(2πR
OUT
or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4859 operating in Mode
also creates a high pass filter with R
DD
i
C
IN
IN
, L
IN
pin.
DD
).
IN
also creates a high pass filter with the internal resistor R
, and R
= 3V and 2.5V ≤ I
Conditions
2
2
area of 10oz printed circuit board ground plane.
area of 10oz printed circuit board ground plane.
IN
9
Functional Description
set at 0dB.
(Notes 1, 2) (Continued)
DD
3D
2
CV
/ 2 voltage and helps maintain the LM4859’s
.
DD
JMAX
≤ 5.5V, unless otherwise specified. Limits
, θ
L
JA
at f
(Note 6)
Typical
, and the ambient temperature, T
O
= 1/(2πR
LM4859
JA
= 62˚C/W.
Limits (Notes
0.7 x I
0.3 x I
L
C
7, 8)
2
3D
OUT
CV
DD
2
2
CVDD
.
CV
DD
).
pin and helps
.
DD
i
A
(Input
. The maximum
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(Limits)
V (max)
V (min)
Units