Texas Instruments LM1896, LM2896 User Manual

LM1896,LM2896
LM1896 LM2896 Dual Audio Power Amplifier
Literature Number: SNAS552A
Obsolete
LM1896/LM2896 Dual Audio Power Amplifier
February 1995
General Description
The LM1896 is a high performance 6V stereo power amplifi­er designed to deliver 1 watt/channel into 4X or 2 watts bridged monaural into 8X. Utilizing a unique patented com­pensation scheme, the LM1896 is ideal for sensitive AM radio applications. This new circuit technique exhibits lower wideband noise, lower distortion, and less AM radiation than conventional designs. The amplifier’s wide supply range (3V–9V) is ideal for battery operation. For higher supplies
l
(V
9V) the LM2896 is available in an 11-lead single-in-
S
line package. The LM2896 package has been redesigned, resulting in the slightly degraded thermal characteristics shown in the figure Device Dissipation vs Ambient Tempera­ture.
Typical Applications
Features
Y
Low AM radiation
Y
Low noise
Y
3V, 4X, stereo P
Y
Wide supply operation 3V–15V (LM2896)
Y
Low distortion
Y
No turn on ‘‘pop’’
Y
Adjustable voltage gain and bandwidth
Y
Smooth waveform clipping
Y
e
P
9W bridged, LM2896
o
o
e
250 mW
Applications
Y
Compact AM-FM radios
Y
Stereo tape recorders and players
Y
High power portable stereos
FIGURE 1. LM2896 in Bridge Configuration (A
Order Number LM1896N Order Number LM2896P
See NS Package Number N14A See NS Package Number P11A
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.
TL/H/7920
e
400, BWe20 kHz)
V
TL/H/7920– 1
Absolute Maximum Ratings
Obsolete
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications.
Supply Voltage
LM1896 V LM2896 V
Operating Temperature (Note 1) 0§Ctoa70§C
Storage Temperature
b
e
12V
S
e
18V
S
65§Ctoa150§C
Junction Temperature 150
Lead Temperature (Soldering, 10 sec.) 260§C
Thermal Resistance
i
(DIP) 30§C/W
JC
i
(DIP) 137§C/W
JA
i
(SIP) 10§C/W
JC
i
(SIP) 55§C/W
JA
C
§
Electrical Characteristics
Unless otherwise specified, T
e
T
25§C, V
TAB
Parameter Conditions
Supply Current P
Operating Supply Voltage 3 10 3 15 V
Output Power THDe10%, fe1 kHz
LM1896N-1 V LM1896N-2 V
LM2896P-1 V LM2896P-2 V
Distortion fe1 kHz
Power Supply Rejection C Ratio (PSRR) Output Referred, V
Channel Separation C
Noise Equivalent Input Noise R
DC Output Level 2.8 3 3.2 5.6 6 6.4 V
Input Impedance 50 100 350 50 100 350 kX
Input Offset Voltage 5 5 mV
Voltage Difference LM1896N-2, LM2896P-2 between Outputs
Input Bias Current 120 120 nA
Note 1: For operation at ambient temperature greater than 25§C, the LM1896/LM2896 must be derated based on a maximum 150§C junction temperature using a thermal resistance which depends upon mounting techniques.
e
S
12V and R
e
25§C, A
A
e
8X. Test circuit shown in
L
e
0W, Dual Mode 15 25 25 40 mA
o
e
6V, R
S
S
V
S
S
S
V
S
V
S
P
o
P
o
P
o
BY
BY
Output Referred
C
IN
CCIR/ARM 1.4 1.4 mV Wideband 2.0 2.0 mV
L
e
6V, R
L
e
9V, R
L
e
12V, R
e
12V, R
e
9V, R
L
e
9V, R
L
e
50 mW 0.09 0.09 %
e
0.5W 0.11 0.11 %
e
1W 0.14 %
e
100 mF, fe1 kHz, C
e
100 mF, fe1 kHz, C
e
0.1 mF, BWe20b20 kHz 1.4 1.4 mV
e
200 (46 dB). For the LM1896; V
V
e
4X Dual Mode 0.9 1.1 W/ch
e
8X Bridge Mode T
e
8X Dual Mode ( 1.3 W/ch
e
8X Dual Mode 2.0 2.5 W/ch
L
e
8X Bridge Mode
L
e
4X Bridge Mode 7.8 W
e
4X Dual Mode * 2.5 W/ch
e
RIPPLE
e
S
e
IN
250 mV
e
IN
0,
Figure 2
0.1 mF
0.1 mF
.
e
25§C 1.8 2.1 W
A
e
T
25§C
TAB
e
6V and R
S
LM1896 LM2896
Min Typ Max Min Typ Max
b40b
54
b50b
64
10 20 10 20 mV
e
4X. For LM2896,
L
7.2 9.0 W
b40b
54 dB
b50b
64 dB
Units
2
Typical Performance Curves
Obsolete
LM2896 Device Dissipation vs Ambient Temperature
LM1896 Maximum Device Dissipation vs Ambient Temperature
b
3 dB Bandwidth vs Voltage
Gain for Stable Operation
THD and Gain vs Frequency
e
A
54 dB, BWe30 kHz
V
THD and Gain vs Frequency
e
A
40 dB, BWe20 kHz
V
Power Supply Rejection Ratio (Referred to the Output) vs Frequency
THD and Gain vs Frequency
e
A
54 dB, BWe5 kHz
V
THD and Gain vs Frequency
e
A
34 dB, BWe50 kHz
V
Channel Separation (Referred to the Output) vs Frequency
THD and Gain vs Frequency
e
A
46 dB, BWe50 kHz
V
AM Recovered Audio and Noise vs Field Strength for Different Speaker Lead Placement
Power Output vs Supply Voltage
TL/H/7920– 2
3
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