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LM4929 bảng dữ liệu(PDF) 5 Page - Texas Instruments

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LM4929
www.ti.com
SNAS293B – DECEMBER 2004 – REVISED APRIL 2013
Electrical Characteristics VDD = 2.4V
(1) (2)
The following specifications apply for VDD = 2.4V, RL = 16Ω, and CB = 4.7µF unless otherwise specified. Limits apply to TA =
25°C. Pin 3 connected to GND
(3).
Symbol
Parameter
Conditions
LM4929
Units
(Limits)
Typ(4)
Limit(5)
IDD
Quiescent Power Supply Current
VIN = 0V, IO = 0A
1.5
3
mA (max)
ISD
Shutdown Current
VSHUTDOWN = GND
0.1
2.0
µA(max)
THD = 1%; f = 1kHz
PO
Output Power
R = 16
25
mW
R = 32
12
VNO
Output Noise Voltage
BW = 20 Hz to 20kHz, A-weighted
10
µV
PSRR
Power Supply Rejection Ratio
VRIPPLE = 200mV sine p-p
65
dB
TWU
Wake Up Time from Shutdown
OCL
0.5
s
(1)
All voltages are measured with respect to the GND 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)
Pin 3 (NC) should be connected to GND for proper part operation.
(4)
Typicals are measured at 25°C and represent the parametric norm.
(5)
Limits are specified to Texas Instruments' AOQL (Average Outgoing Quality Level).
External Components Description
See Figure 2
Components
Functional Description
1.
RI
Inverting input resistance which sets the closed-loop gain in conjunction with Rf. This resistor also forms a high-pass
filter with Ci at fc = 1/(2πRiCi).
2.
CI
Input coupling capacitor which blocks the DC voltage at the amplifier's input terminals. Also creates a high-pass filter
with Ri at fc = 1/(2πRiCi). Refer to the section PROPER SELECTION OF EXTERNAL COMPONENTS for an
explanation of how to determine the value of Ci.
3.
Rf
Feedback resistance which sets the closed-loop gain in conjunction with Ri.
4.
CS
Supply bypass capacitor which provides power supply filtering. Refer to the POWER SUPPLY BYPASSING section for
information concerning proper placement and selection of the supply bypass capacitor.
5.
CB
Bypass pin capacitor which provides half-supply filtering. Refer to the section, PROPER SELECTION OF EXTERNAL
COMPONENTS, for information concerning proper placement and selection of CB
Copyright © 2004–2013, Texas Instruments Incorporated
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