lm4985tmx National Semiconductor Corporation, lm4985tmx Datasheet - Page 6

• 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

www.national.com
T
R
A
A
∆A
V
I
I
V
V
P
DD
SD
WU
IN
VMIN
VMAX
OS
SDIH
SDIL
O
Electrical Characteristics V
The following specifications apply for R
25˚C.
Electrical Characteristics V
The following specifications apply for R
25˚C.
V
Symbol
Symbol
Quiescent Power Supply Current
Shutdown Current
Logic Voltage Input High
Logic Voltage Input Low
Output Power
Wake Up Time form Shutdown
Input Resistance
Minimum Gain
Maximum Gain
Gain Accuracy per Step
Output Offset Voltage
Parameter
Parameter
L
L
= 16Ω, f = 1kHz, and C
= 16Ω, f = 1kHz, and C
DD
DD
= 5V
= 3.6V
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
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
SHUTDOWN
LOAD
LOAD
LOAD
LOAD
IN
BYPASS
LOAD
OCL
C-CUPL
OCL
C-CUPL
OCL
C-CUPL
OCL
C-CUPL
= 0V, I
= AC GND
(Notes 1, 2) (Continued)
= 16Ω OCL
= 16Ω C-CUPL
= 32Ω OCL
= 32Ω C-CUPL
= 32Ω
<
= 4.7µF (Note 11)
(Notes 1, 2)
V
6
OUT
1%, f
V
≥ –44dB
B
B
= GND
>
Conditions
= 4.7µF unless otherwise specified. Limits apply to T
= 4.7µF unless otherwise specified. Limits apply to T
Conditions
= 0A
–76dB
IN
= 1kHz
(Note 6)
(Note 6)
1030
2050
±
±
Typ
Typ
285
110
530
180
320
–76
1.8
1.0
2.1
2.3
0.1
2.0
68
70
38
41
75
20
10
18
0.5
1.0
LM4985
LM4985
(Notes 7,
(Notes 7,
Limit
Limit
2.52
1.08
3.1
1.0
20
60
34
8)
8)
4
3
mV (max)
mA (max)
mW (min)
µA (max)
dB (min)
dB (min)
(Limits)
(Limits)
A
A
V (max)
V (min)
Units
msec
Units
=
=
kΩ
dB