LM4985TM datasheet(8/29 Pages) NSC

Il numero della parte	LM4985TM

Spiegazioni elettronici	Stereo 135mW Low Noise Headphone Amplifier with Selectable Capacitively Coupled or Output Capacitor-less (OCL) Output and Digitally Controlled (I2C) V

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Electrical Characteristics V

DD = 2.5V (Notes 1, 2)

The following specifications apply for R

L =16

Ω, f = 1kHz, and C

B = 4.7µF unless otherwise specified. Limits apply to TA =

25˚C.

Symbol

Parameter

Conditions

LM4985

Units

(Limits)

Typ

(Note 6)

Limit

(Notes 7,

8)

I

DD

Quiescent Power Supply Current

V

IN = 0V, IOUT =0A

Single-Channel no load OCL

Single-Channel no load C-CUPL

Dual-Channel no load OCL

Dual-Channel no load C-CUPL

1.6

1

2.1

1.6

mA

I

SD

Shutdown Current

V

SHUTDOWN = GND

0.1

µA

V

SDIH

Logic Voltage Input High

1.75

V (min)

V

SDIL

Logic Voltage Input Low

0.75

V (max)

P

O

Output Power

THD+N < 1%, f

IN = 1kHz

R

LOAD =16

Ω OCL

R

LOAD =16

Ω C-CUPL

R

LOAD =32

Ω OCL

R

LOAD =32

Ω C-CUPL

31

33

19

mW

THD+N

Total Harmonic Distortion + Noise

R

LOAD =16

Ω OCL, P

O = 26mW

R

LOAD =16

Ω C-CUPL, P

O = 20mW

R

LOAD =32

Ω OCL, P

O = 16mW

R

LOAD =32

Ω C-CUPL, P

O = 15mW

0.07

0.05

0.06

0.04

%

V

ON

Output Noise Voltage

V

IN = AC GND, AV = 0dB, A-weighted

10

µV

PSRR

Power Supply Rejection Ratio

V

RIPPLE = 200mVp-p (Note 9)

f

IN = 217Hz sinewave

OCL

C-CUPL

75

59

dB

f

IN = 1kHz sinewave

OCL

C-CUPL

75

59

Xtalk

Channel-to-Channel Crosstalk

P

out = 20mW, OCL

R

LOAD =16

Ω

R

LOAD=32

Ω

50

55

dB

P

out = 20mW. C-CUPL

R

LOAD =16

Ω

R

LOAD=32

Ω

58

67

dB

T

WU

Wake Up Time from Shutdown

C

BYPASS = 4.7µF (Note 11)

WT1=0,WT0=0

OCL

C-CUPL

66

214

msec

WT1=0,WT0=1

OCL

C-CUPL

92

544

WT1=1,WT0=0

OCL

C-CUPL

145

1053

WT1=1,WT0=1

OCL

C-CUPL

250

2098

R

IN

Input Resistance

Stereo mode

Mono mode

20

10

k

Ω

A

VMIN

Minimum Gain

Code = 00000

–76

dB

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