Datasheet

LM4875
www.ti.com SNAS042C –JANUARY 2002–REVISED MAY 2013
ELECTRICAL CHARACTERISTICS
(1)(2)
The following specifications apply for V
DD
= 5V, unless otherwise specified. Limits apply for T
A
= 25°C.
LM4875
Symbol Parameter Conditions
Min
(3)
Typical
(4)
Max
(3)
Units
V
DD
Supply Voltage 2.7 5.5 V
V
IN
= 0V, I
O
= 0A, HP Sense = 0V 4 7 mA
I
DD
Quiescent Power Supply Current
V
IN
= 0V, I
O
- 0A, HP Sense = 5V 3.5 6 mA
I
SD
Shutdown Current V
PIN4
≤ 0.3V 0.7 µA
V
OS
Output Offset Voltage V
IN
= 0V 5 50 mV
THD = 1% (max), HP Sense < 0.8V, f =
500 750 mW
1kHz, R
L
= 8Ω
THD = 10% (max), HP Sense < 0.8V, f =
1.0 W
1kHz, R
L
= 8Ω
P
O
Output Power
THD + N = 1%, HP Sense > 4V,
80 mW
f = 1kHz, R
L
= 32Ω
THD = 10%, HP Sense > 4V,
110 mW
f = 1kHz, R
L
= 32Ω
P
O
= 300 mWrms, f = 20Hz–20kHz, R
L
=
THD+N Total Harmonic Distortion + Noise 0.6 %
8Ω
V
RIPPLE
= 200mVrms, R
L
= 8Ω, C
B
= 1.0
PSRR Power Supply Rejection Ratio 50 dB
µF, f = 1kHz
Gain with V
PIN4
≥ 4.0V, (80% of V
DD
) 18.8 20 dB
Gain
RANGE
Single-Ended Gain Range
Gain with V
PIN4
≤ 0.9V, (20% of V
DD
) −70 −72 dB
V
IH
HP Sense High Input Voltage 4 V
V
IL
HP Sense Low Input Voltage 0.8 V
(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 that ensure specific performance limits. This assumes that the device operates within the
Operating Ratings. Specifications are not ensured for parameters where no limit is given. The typical value, however, is a good
indication of device performance.
(3) Limits are ensured to AOQL (Average Outgoing Quality Level).
(4) Typicals are measured at 25°C and represent the parametric norm.
EXTERNAL COMPONENTS DESCRIPTION
(Figure 1)
Components Functional Description
1. C
i
Input coupling capacitor blocks DC voltage at the amplifier's input terminals. It also creates a highpass filter with the
internal R
i
that produces an f
c
= 1/(2πR
i
C
i
) (10kΩ ≤ R
i
≤ 100kΩ). Refer to the APPLICATION INFORMATION section,
PROPERLY SELECTING EXTERNAL COMPONENTS, for an explanation of determining the value of C
i
.
2. C
S
The supply bypass capacitor. Refer to the POWER SUPPLY BYPASSING section for information about properly placing,
and selecting the value of, this capacitor.
3. C
B
The capacitor, C
B
, filters the half-supply voltage present on the BYPASS pin. Refer to the APPLICATION INFORMATION
Section,PROPERLY SELECTING EXTERNAL COMPONENTS, for information concerning proper placement and selecting
C
B
's value.
Copyright © 2002–2013, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Links: LM4875