Datasheet

LM4917
www.ti.com SNAS238G –AUGUST 2004–REVISED MAY 2013
Electrical Characteristics V
DD
= 3V
(1)
The following specifications apply for V
DD
= 3V, A
V
= 1, and 16Ω load unless otherwise specified. Limits apply to T
A
= 25°C.
LM4917
Units
Symbol Parameter Conditions
(Limits)
Typ
(2)
Limit
(3)(4)
I
DD
Quiescent Power Supply Current V
IN
= 0V, I
O
= 0A, both channels enabled 11 20 mA (max)
V
IN
= 0V, I
O
= 0A, one channel enabled 9 mA
I
SD
Shutdown Current V
SD_LC
= V
SD_RC
= GND 0.01 1 µA (max)
V
OS
Output Offset Voltage R
L
= 32Ω 1 10 mV (max)
P
O
Output Power THD+N = 1% (max); f = 1kHz, R
L
= 16Ω 95 50 mW (min)
THD+N = 1% (max); f = 1kHz, R
L
= 32Ω 82 mW
P
O
= 50mW, f = 1kHz, R
L
= 32Ω
THD+N Total Harmonic Distortion + Noise 0.02 %
(A-weighted) single channel
V
RIPPLE
= 200mV sine p-p,
PSRR Power Supply Rejection Ratio f = 1kHz 70 dB
f = 20kHz 55
SNR Signal-to-Noise Ratio R
L
= 32Ω, P
OUT
= 20mW, f = 1kHz 100 dB
V
IH
=
V
IH
Shutdown Input Voltage High V (min)
0.7*CPV
DD
V
IL
=
V
IL
Shutdown Input Voltage Low V (max)
0.3*CPV
DD
T
WU
Wake Up Time From Shutdown 339 µs (max)
X
TALK
Crosstalk R
L
= 16Ω, P
O
= 1.6mW, f = 1kHz 70 dB
I
L
Input Leakage Current ±0.1 nA
(1) All voltages are measured with respect to the GND pin unless otherwise specified.
(2) Typicals are measured at 25°C and represent the parametric norm.
(3) Limits are specifed to Texas Instruments' AOQL (Average Outgoing Quality Level).
(4) Datasheet min/max specification limits are specified by design, test, or statistical analysis.
External Components Description
(See Figure 1)
Components Functional Description
Inverting input resistance which sets the closed-loop gain in conjunction with R
f
. This resistor also forms a high-pass
1. R
i
filter with C
i
at f
c
= 1 / (2πR
i
C
i
).
Input coupling capacitor which blocks the DC voltage at the amplifier's input terminals. Also creates a high-pass filter
2. C
i
with R
i
at f
c
= 1 / (2πR
i
C
i
). Refer to the section Proper Selection of External Components, for an explanation of
how to determine the value of C
i
.
3. R
f
Feedback resistance which sets the closed-loop gain in conjunction with R
i
.
4. C
1
Flying capacitor. Low ESR ceramic capacitor (≤100mΩ)
5. C
2
Output capacitor. Low ESR ceramic capacitor (≤100mΩ)
Tantalum capacitor. Supply bypass capacitor which provides power supply filtering. Refer to the POWER SUPPLY
6. C
3
BYPASSING section for information concerning proper placement and selection of the supply bypass capacitor.
Ceramic capacitor. Supply bypass capacitor which provides power supply filtering. Refer to the POWER SUPPLY
7. C
4
BYPASSING section for information concerning proper placement and selection of the supply bypass capacitor.
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