lm4985tmx National Semiconductor Corporation, lm4985tmx Datasheet - Page 7

• 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

THD+N
V
PSRR
Xtalk
T
R
A
A
∆A
V
WU
ON
IN
VMIN
VMAX
OS
Electrical Characteristics V
The following specifications apply for R
25˚C.
V
Symbol
Total Harmonic Distortion + Noise
Output Noise Voltage
Power Supply Rejection Ratio
Channel-to-Channel Crosstalk
Wake Up Time from Shutdown
Input Resistance
Minimum Gain
Maximum Gain
Gain Accuracy per Step
Output Offset Voltage
Parameter
L
= 16Ω, f = 1kHz, and C
DD
= 3.6V
R
R
R
R
V
V
f
f
P
P
C
WT1 = 0, WT0 = 0
WT1 = 0, WT0 = 1
WT1 = 1, WT0 = 0
WT1 = 1, WT0 =1
Stereo mode
Mono mode
Code = 00000
Code = 11111
18dB ≥ A
–44dB ≥ A
OCL
R
V
IN
IN
IN
RIPPLE
out
out
IN
LOAD
LOAD
LOAD
LOAD
BYPASS
LOAD
OCL
C-CUPL
OCL
C-CUPL
R
R
R
R
OCL
C-CUPL
OCL
C-CUPL
OCL
C-CUPL
OCL
C-CUPL
= 217Hz sinewave
= 1kHz sinewave
LOAD
LOAD
LOAD
LOAD
= AC GND, A
= AC GND
= 40mW. OCL
= 50mW. C-CUPL
= 16Ω OCL, P
= 16Ω C-CUPL, P
= 32Ω OCL, P
= 32Ω C-CUPL, P
= 32Ω
= 200mVp-p (Note 9)
= 32Ω
= 32Ω
= 4.7µF (Note 11)
(Notes 1, 2) (Continued)
= 16Ω
= 16Ω
V
7
V
≥–44dB
B
>
Conditions
= 4.7µF unless otherwise specified. Limits apply to T
–76dB
V
= 0dB, A-weighted
O
O
= 60mW
= 33mW
O
O
= 60mW
= 38mW
(Note 6)
±
±
1532
0.06
0.03
0.03
0.03
Typ
222
405
143
774
246
–76
2.0
15
77
63
76
62
51
56
58
69
66
92
20
10
18
0.5
1.0
LM4985
(Notes 7,
Limit
±
±
–72
55
57
93
17
20
8)
1.0
2.0
www.national.com
mV (max)
dB (max)
dB (min)
dB (min)
(Limits)
A
Units
msec
=
µV
dB
dB
kΩ
dB
%