Electrical Characteristics for Single-Ended Mode Operation
(Notes 7, 10)
The following specifications apply for V
DD
= 5V. Limits apply for T
A
= 25˚C.
(Continued)
LM4835
Symbol
PSRR
SNR
X
talk
Parameter
Power Supply Rejection Ratio
Signal to Noise Ratio
Channel Separation
Conditions
C
B
= 1.0 µF, f =120 Hz,
V
RIPPLE
= 200 mVrms
P
OUT
=75 mW, R
Filter
L
Typical
(Note 14)
58
102
65
Limit
(Note 15)
Units
(Limits)
dB
dB
dB
= 32Ω, A-Wtd
f=1kHz, C
B
= 1.0 µF
Electrical Characteristics for Bridged Mode Operation
(Notes 7, 10)
The following specifications apply for V
DD
= 5V, unless otherwise noted. Limits apply for T
A
= 25˚C.
LM4835
Symbol
V
OS
P
O
Parameter
Output Offset Voltage
Output Power
V
IN
= 0V
THD + N = 1.0%; f=1kHz; R
L
= 3Ω
(Note 8)
THD + N = 1.0%; f=1kHz; R
L
= 4Ω
(Note 9)
THD = 0.5% (max);f = 1 kHz;
R
L
= 8Ω
THD+N = 10%;f = 1 kHz; R
L
= 8Ω
THD+N
Total Harmonic Distortion+Noise
P
O
= 1W, 20 Hz
<
f
<
20 kHz,
R
L
= 8Ω, A
VD
= 2
P
O
= 340 mW, R
L
= 32Ω
PSRR
SNR
X
talk
Power Supply Rejection Ratio
Signal to Noise Ratio
Channel Separation
C
B
= 1.0 µF, f = 120 Hz,
V
RIPPLE
= 200 mVrms; R
L
= 8Ω
V
DD
= 5V, P
OUT
= 1.1W, R
L
= 8Ω,
A-Wtd Filter
f=1kHz, C
B
= 1.0 µF
2
Conditions
Typical
(Note 14)
5
2.2
2
1.1
1.5
0.3
1.0
74
93
70
Limit
(Note 15)
30
Units
(Limits)
mV (max)
W
W
1.0
W (min)
W
%
%
dB
dB
dB
Note 3:
The
θ
JA
given is for an MXA28A package whose exposed-DAP is soldered to an exposed 2in
piece of 1 ounce printed circuit board copper.
Note 4:
The
θ
JA
given is for an MXA28A package whose exposed-DAP is soldered to a 2in
2
piece of 1 ounce printed circuit board copper on a bottom side layer
through 21 8mil vias.
Note 5:
The
θ
JA
given is for an MXA28A package whose exposed-DAP is soldered to an exposed 1in
2
piece of 1 ounce printed circuit board copper.
Note 6:
The
θ
JA
given is for an MXA28A package whose exposed-DAP is not soldered to any copper.
Note 7:
All voltages are measured with respect to the ground pins, unless otherwise specified. All specifications are tested using the typical application as shown
in
Figure 1.
Note 8:
When driving 3Ω loads from a 5V supply the LM4835MTE must be mounted to the circuit board and forced-air cooled.
Note 9:
When driving 4Ω loads from a 5V supply the LM4835MTE must be mounted to the circuit board.
Note 10:
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. Marshall Chiu feels there are better ways to obtain
″More
Watt-
age in the Cottage.″ Specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device performance.
Note 11:
The maximum power dissipation must be derated at elevated temperatures and is dictated by T
JMAX
,
θ
JA
, and the ambient temperature T
A
. The maximum
allowable power dissipation is P
DMAX
= (T
JMAX
− T
A
)/θ
JA
. For the LM4835MT, T
JMAX
= 150˚C, and the typical junction-to-ambient thermal resistance, when board
mounted, is 80˚C/W assuming the MTC28 package.
Note 12:
Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 13:
Machine Model, 220 pF–240 pF discharged through all pins.
Note 14:
Typicals are measured at 25˚C and represent the parametric norm.
Note 15:
Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
3
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
