lm4985tmx National Semiconductor Corporation, lm4985tmx Datasheet - Page 8

• Manufacturer Part Number: lm4985tmx
• Description: Stereo 135mw Low Noise Headphone Amplifier With Selectable Capacitively Coupled Or Output Capacitor-less Ocl Output And Digitally Controlled I2c V
• Manufacturer: National Semiconductor Corporation

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I
I
V
V
P
THD+N
V
PSRR
Xtalk
T
R
A
DD
SD
WU
SDIH
SDIL
O
ON
IN
VMIN
Electrical Characteristics V
The following specifications apply for R
25˚C.
Symbol
Quiescent Power Supply Current
Shutdown Current
Logic Voltage Input High
Logic Voltage Input Low
Output Power
Total Harmonic Distortion + Noise
Output Noise Voltage
Power Supply Rejection Ratio
Channel-to-Channel Crosstalk
Wake Up Time from Shutdown
Input Resistance
Minimum Gain
Parameter
L
= 16Ω, f = 1kHz, and C
DD
= 2.5V
V
Single-Channel no load OCL
Single-Channel no load C-CUPL
Dual-Channel no load OCL
Dual-Channel no load C-CUPL
V
THD+N
R
R
R
R
R
R
R
R
V
V
f
f
P
P
C
WT1 = 0, WT0 = 0
OCL
C-CUPL
WT1 = 0, WT0 = 1
OCL
C-CUPL
WT1 = 1, WT0 = 0
OCL
C-CUPL
WT1 = 1, WT0 = 1
OCL
C-CUPL
Stereo mode
Mono mode
Code = 00000
IN
IN
IN
SHUTDOWN
IN
RIPPLE
out
out
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
BYPASS
OCL
C-CUPL
OCL
C-CUPL
R
R
R
R
= 217Hz sinewave
= 1kHz sinewave
LOAD
LOAD
LOAD
LOAD
= 0V, I
= AC GND, A
= 20mW, OCL
= 20mW. C-CUPL
= 16Ω OCL
= 16Ω C-CUPL
= 32Ω OCL
= 32Ω C-CUPL
= 16Ω OCL, P
= 16Ω C-CUPL, P
= 32Ω OCL, P
= 32Ω C-CUPL, P
<
= 200mVp-p (Note 9)
= 32Ω
= 32Ω
= 16Ω
= 16Ω
= 4.7µF (Note 11)
(Notes 1, 2)
8
OUT
1%, f
B
= GND
Conditions
= 4.7µF unless otherwise specified. Limits apply to T
= 0A
IN
V
= 1kHz
= 0dB, A-weighted
O
O
= 26mW
= 16mW
O
O
= 20mW
= 15mW
(Note 6)
1053
2098
0.07
0.05
0.06
0.04
Typ
–76
214
544
145
250
1.6
2.1
1.6
0.1
31
33
19
19
10
75
59
75
59
50
55
58
67
66
92
20
10
1
LM4985
(Notes 7,
Limit
1.75
0.75
8)
(Limits)
A
V (max)
V (min)
Units
msec
=
mW
mA
µA
µV
dB
dB
dB
kΩ
dB
%