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LM4985TMEVAL bảng dữ liệu(PDF) 5 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  LAudio Power Amplifier Series Stereo 135mW Low Noise Headphone Amplifier with Selectable Capacitively Coupled
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LM4985, LM4985TMEVAL
www.ti.com
SNAS346B – MAY 2006 – REVISED MAY 2006
Electrical Characteristics VDD = 5V
(1)(2) (continued)
The following specifications apply for RL = 16Ω, f = 1kHz, and CB = 4.7µF unless otherwise specified. Limits apply to TA =
25°C.
Symbol
Parameter
Conditions
LM4985
Units
(Limits)
Typ(3)
Limit(4)(5)
THD
≤ 1%; fIN = 1kHz
RLOAD = 16Ω OCL
135
115
PO
Output Power
RLOAD = 16Ω C-CUPL
135
mW (min)
RLOAD = 32Ω OCL
79
70
RLOAD = 32Ω C-CUPL
80
RLOAD = 16Ω OCL, PO = 100mW
0.08
RLOAD = 16Ω C-CUPL, PO = 100mW
0.02
THD+N
Total Harmonic Distortion + Noise
%
RLOAD = 32Ω OCL, PO = 60mW
0.04
RLOAD = 32Ω C-CUPL, PO = 70mW
0.01
VON
Output Noise Voltage
VIN = AC GND, AV = 0dB, A-weighted
15
µV
VRIPPLE = 200mVp-p
(6)
fIN = 217Hz sinewave
57
OCL
77
C-CUPL
65
PSRR
Power Supply Rejection Ratio
dB (min)
fIN = 1kHz sinewave
OCL
77
60
C-CUPL
65
Pout = 40mW. OCL
RLOAD = 16Ω
51
dB
RLOAD= 32Ω
56
Xtalk
Channel-to-channel Crosstalk
Pout = 50mW. C-CUPL
RLOAD = 16Ω
58
dB
RLOAD= 32Ω
68
CBYPASS= 4.7μF
(7)
WT1 = 0, WT0 = 0
OCL
75
C-CUPL
285
WT1 = 0, WT0 = 1
OCL
110
TWU
Wake Up Time form Shutdown
C-CUPL
530
msec
WT1 = 1, WT0 = 0
OCL
180
C-CUPL
1030
WT1 = 1, WT0 = 1
OCL
320
C-CUPL
2050
Stereo mode
20
RIN
Input Resistance
k
Mono mode
10
AVMIN
Minimum Gain
Code = 00000
–76
dB (min)
AVMAX
Maximum Gain
Code = 11111
18
dB (min)
18dB
≥ AV ≥ –44dB
±0.5
ΔAV
Gain Accuracy per Step
dB
–44dB
≥ AV > –76dB
±1.0
OCL
VOS
Output Offset Voltage
RLOAD = 32Ω
2.0
20
mV (max)
VIN = AC GND
(6)
10
Ω terminated input.
(7)
The wake-up time (TWU) is calculated using the following formula; TWU = [CBYPASS (VDD) / 2 (IBYPASS)] + 40ms.
Copyright © 2006, Texas Instruments Incorporated
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