LM49120, LM49120TLEVAL

SNAS431C – JUNE 2008 – REVISED MAY 2013

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Electrical Characteristics 3.3V

(1)(2) (continued)

The following specifications apply for VDD = 3.3V, TA = 25°C, all volume controls set to 0dB, unless otherwise specified.

LM49120

Units

Parameter

Test Conditions

(Limits)

Typ(3)

Limits(4)

VRIPPLE = 200mVPP; fRIPPLE = 217Hz, RL = 8Ω (Speaker); RL = 32Ω (Headphone)

CB = 2.2µF, BTL

All audio inputs terminated to GND; output referred

Speaker Output; Speaker Output Gain 6dB

Speaker Amplifier; Mode 1

79

dB

Speaker Amplifier; Mode 2

63

dB

Speaker Amplifier; Mode 3

62

dB

Speaker Amplifier Output; Speaker Output Gain 0dB

Speaker Amplifier; Mode 1

84

dB

PSRR

Power Supply Rejection Ratio

Speaker Amplifier; Mode 2

63

dB

Speaker Amplifier; Mode 3

62

dB

Headphone Amplifier Output

Headphone Amplifier; SE, Mode 4

83

dB

Headphone Amplifier; SE, Mode 8

84

dB

Headphone Amplifier; SE, Mode 12

78

dB

Headphone Amplifier; OCL, Mode 4

83

dB

Headphone Amplifier; OCL, Mode 8

80

dB

Headphone Amplifier; OCL, Mode 12

77

dB

VOL∈

Volume Control Step Size Error

±0.2

dB

–91

dB (min)

Maximum Attenuation

–86

–81

dB (max)

VOLRANGE Digital Volume Control Range

17.4

dB (min)

Maximum Gain

18

18.6

dB (max)

Au(HP)

HP (SE) Mute Attenuation

Output Mode 1, 2, 3

96

dB

10

k

Ω (min)

Maximum gain setting

12.5

15

k

Ω (max)

MONO_IN Input Impedance

ZIN

LIN and RIN Input Impedance

90

k

Ω (min)

Maximum attenuation setting

110

130

k

Ω (max)

f = 217Hz, VCM = 1VPP,

Speaker, BTL, Mode 1,

61

dB

RL = 8Ω

Differential Input

CMRR

Common-Mode Rejection Ratio

f = 217Hz, VCM = 1VPP,

Headphone, OCL, Mode 4,

66

dB

RL = 32Ω

Stereo Input

Headphone; POUT = 12mW

–60

dB

f = 1kHz, OCL. Mode 8

XTALK

Crosstalk

Headphone; POUT = 12mW

–72

dB

f = 1kHz, SE, Mode 8

CB = 4.7μF, OCL

35

ms

CB = 2.2μF, SE,

Normal Turn On Mode

120

ms

Turn_On_Time = 1

TWU

Wake-Up Time from Shutdown

CB = 2.2μF, OCL

30

ms

CB = 4.7μF, SE,

Fast Turn On Mode

130

ms

Turn_On_Time = 0

6

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