Electrical Characteristics
(Notes 5, 6)
(Continued)
The following specifications apply for V
+
= +28V, V
−
= −28V, I
MUTE
= −0.5 mA with R
L
= 4Ω unless otherwise specified. Limits
apply for T
A
= 25˚C.
LM3886
Symbol
e
IN
(Note 4)
SNR
Input Noise
Signal-to-Noise Ratio
Parameter
Conditions
IHF — A Weighting Filter
R
IN
= 600Ω (Input Referred)
P
O
= 1W, A-Weighted,
Measured at 1 kHz, R
S
= 25Ω
P
O
= 60W, A-Weighted,
Measured at 1 kHz, R
S
= 25Ω
60 Hz, 7 kHz, 4:1 (SMPTE)
60 Hz, 7 kHz, 1:1 (SMPTE)
Typical
Limit
(Note 10) (Note 11)
2.0
92.5
110
0.004
0.009
10
Units
(Limits)
µV (max)
dB
dB
%
IMD
Intermodulation Distortion Test
Note 2:
Operation is guaranteed up to 84V, however, distortion may be introduced from
SPIKeProtection
Circuitry if proper thermal considerations are not taken into
account. Refer to the
Thermal Considerations
section for more information. (See
SPIKe
Protection Response)
Note 3:
DC Electrical Test; refer to Test Circuit
#1.
Note 4:
AC Electrical Test; refer to Test Circuit
#2.
Note 5:
All voltages are measured with respect to the GND pin (pin 7), unless otherwise specified.
Note 6:
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 7:
For operating at case temperatures above 25˚C, the device must be derated based on a 150˚C maximum junction temperature and a thermal resistance of
θ
JC
= 1.0 ˚C/W (junction to case). Refer to the Thermal Resistance figure in the Application Information section under Thermal Considerations.
Note 8:
Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 9:
The operating junction temperature maximum is 150˚C, however, the instantaneous Safe Operating Area temperature is 250˚C.
Note 10:
Typicals are measured at 25˚C and represent the parametric norm.
Note 11:
Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 12:
The LM3886T package TA11B is a non-isolated package, setting the tab of the device and the heat sink at V
−
potential when the LM3886 is directly
mounted to the heat sink using only thermal compound. If a mica washer is used in addition to thermal compound,
θ
CS
(case to sink) is increased, but the heat sink
will be isolated from V
−
.
Note 13:
The feedback compensation network limits the bandwidth of the closed-loop response and so the slew rate will be reduced due to the high frequency
roll-off. Without feedback compensation, the slew rate is typically larger.
Note 14:
V
−
must have at least −9V at its pin with reference to ground in order for the under-voltage protection circuitry to be disabled.
Note 15:
The output dropout voltage is the supply voltage minus the clipping voltage. Refer to the Clipping Voltage vs Supply Voltage graph in the
Typical Perfor-
mance Characteristics
section.
Note 16:
The Differential Input Voltage Absolute Maximum Rating is based on supply voltages of V
+
= +40V and V
−
= −40V.
Test Circuit
#1
(DC Electrical Test Circuit)
DS011833-3
www.national.com
4
NSC [ NATIONAL SEMICONDUCTOR ]
