LM4921

SNAS178E – JULY 2003 – REVISED MAY 2013

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Electrical Characteristics DVDD = 3.0V, AVDD = 5.0V, RL = 32Ω

(1) (2)

The following specifications apply for the circuit shown in Figure 1 unless otherwise specified. Limits apply for TA = 25°C.

LM4921

Units

Symbol

Parameter

Conditions

(Limits)

Typical(3)

Limit(4)(5)

DVDD

Digital Power Supply Voltage

See (6)

3.0

V

AVDD

Analog Power Supply Voltage

See (6)

5.0

V

DIDD

Digital Power Supply Quiescent

RLoad = ∞, fMLCK = 11.2896MHz

3.5

7.5

mA (max)

Current

AIDD

Analog Power Supply Quiescent

RLoad = ∞, fMCLK = 0MHz

6

10

mA (max)

Current

ISD

Total Shutdown Power Supply

SHUTDOWN SPI bits 1 & 2 set to

Current

logic 0,

1

5

uA(max)

SPI, MCLK and I

2S inputs at GND

ISB

Standby Current

Analog and Digital together

25

uA

All clocks off

VFS

Full-Scale Output Voltage

Gain set at max

3.5

VP-P

THD+N

Total Harmonic Distortion + Noise

fIN = 1kHz, POUT = 12mW

(Vol Control = 11111, I2S input adj to

0.03

%

get 12mW at output)

PO

Headphone Amplifier Output Power

THD = (0.5%), fOUT = 1kHz

50

40

mW (min)

AVDD CBYPASS = 2.0µF

PSRR

Power Supply Rejection Ratio

62

45

dB (min)

VRIPPLE = 200mVP-P 217Hz

SNR

Signal-to-Noise Ratio

fIN = 1kHz sinewave at -60dBFS,

82

dB

A-weighted-fCONV = 44.1kHz

DR

Dynamic Range

fIN = 1kHz sinewave at -60dBFS,

84

dB

A-weighted

ΔACH-CH

Channel-to-Channel Gain Mismatch

fIN = 1kHz

0.06

dB

XTALK

Channel-to-Channel Crosstalk

fCONV = 44.1kHz,

72

dB

fIN = 1kHz sinewave at -3dBFS

Volume Control Range

Minimum Attenuation

+3.0

dB

Maximum Attenuation

-43.5

dB

Volume Control Control Step Size

1.5

dB

Mute Attenuation

-102

dB

(1)

Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for

which the device is functional, but do not ensure specific performance limits. Electrical Characteristics state DC and AC electrical

specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the

Operating Ratings. Specifications are not ensured for parameters where no limit is given, however, the typical value is a good indication

of device performance.

(2)

All voltages are measured with respect to the GND pin, unless otherwise specified.

(3)

Typicals are measured at 25°C and represent the parametric norm.

(4)

Limits are specified to AOQL (Average Outgoing Quality Level).

(5)

Datasheet min/max specification limits are specified by design, test, or statistical analysis.

(6)

Best operation is achieved by maintaining 3.0V

≤ AVDD ≤ 5.0V and 3.0V ≤ DVDD ≤ 5.0V.

6

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