Datasheet

LM4808
www.ti.com SNAS051D –FEBRUARY 2000–REVISED MAY 2013
ELECTRICAL CHARACTERISTICS
(1) (2)
(continued)
The following specifications apply for V
DD
= 3.3V unless otherwise specified, limits apply to T
A
= 25°C.
Symbol Parameter Conditions Conditions Units
(Limits)
Typ
(3)
Limit
(4)
THD+N = 0.1%, f = 1 kHz
R
L
= 16Ω 40 mW
R
L
= 32Ω 28 mW
P
o
Output Power
THD+N = 10%, f = 1 kHz
R
L
= 16Ω 56 mW
R
L
= 32Ω 38 mW
ELECTRICAL CHARACTERISTICS
(1) (2)
The following specifications apply for V
DD
= 2.6V unless otherwise specified, limits apply to T
A
= 25°C.
Symbol Parameter Conditions Conditions Units
(Limits)
Typ
(3)
Limit
(4)
I
DD
Supply Current V
IN
= 0V, I
O
= 0A 0.9 mA (max)
V
OS
Input Offset Voltage V
IN
= 0V 5 mV (max)
THD+N = 0.1%, f = 1 kHz
R
L
= 16Ω 20 mW
R
L
= 32Ω 16 mW
P
o
Output Power
THD+N = 10%, f = 1 kHz
R
L
= 16Ω 31 mW
R
L
= 32Ω 22 mW
(1) All voltages are measured with respect to the ground pin, unless otherwise specified.
(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 ensure specific performance limits. Electrical Characteristics state DC and AC electrical
specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the
Operating Ratings. Specifications are not ensured for parameters where no limit is given, however, the typical value is a good indication
of device performance.
(3) Typicals are measured at 25°C and represent the parametric norm.
(4) Tested limits are specified to AOQL (Average Outgoing Quality Level). Datasheet min/max specification limits are specified by design,
test, or statistical analysis.
EXTERNAL COMPONENTS DESCRIPTION
(Figure 1)
Components Functional Description
The inverting input resistance, along with R
f
, set the closed-loop gain. R
i
, along with C
i
, form a high pass filter with f
c
=
1. R
i
1/(2πR
i
C
i
).
The input coupling capacitor blocks DC voltage at the amplifier's input terminals. C
i
, along with R
i
, create a highpass filter
2. C
i
with f
C
= 1/(2πR
i
C
i
). Refer to the section, SELECTING PROPER EXTERNAL COMPONENTS, for an explanation of
determining the value of C
i
.
3. R
f
The feedback resistance, along with R
i
, set closed-loop gain.
This is the supply bypass capacitor. It provides power supply filtering. Refer to the APPLICATION INFORMATION section
4. C
S
for proper placement and selection of the supply bypass capacitor.
This is the half-supply bypass pin capacitor. It provides half-supply filtering. Refer to the section, SELECTING PROPER
5. C
B
EXTERNAL COMPONENTS, for information concerning proper placement and selection of C
B
.
This is the output coupling capacitor. It blocks the DC voltage at the amplifier's output and forms a high pass filter with R
L
at
6. C
O
f
O
= 1/(2πR
L
C
O
)
7. R
B
This is the resistor which forms a voltage divider that provides 1/2 V
DD
to the non-inverting input of the amplifier.
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