LM4921 datasheet(7/18 Pages) NSC

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Electrical Characteristics-Digital Inputs DV

DD = 3.0V (Notes 1, 2)

The following specifications apply for the circuit shown in Figure 1 unless otherwise specified. Limits apply for T

A = 25˚C.

Symbol

Parameter

Conditions

LM4921

Units

(Limits)

Typical

Limit

(Note 6)

(Notes 7, 9)

Resolution

Bits

Audio Data Interface Format

Standard, I

2S, Left Justified

MCLK

Master Clock Frequency

11.2896

(256FS)

MHz

CONV

Sampling Clock Frequency Range

44.1

kHz

Digital Input: Logic Low Voltage

Level

0.3XDV

V (max)

Digital Input: Logic High Voltage

Level

0.7XDV

V (min)

SPI_ENB Setup Time

ns (min)

SPI_ENB Hold Time

ns (min)

SPI_ENB Low Time

ns (min)

SPI_Data Setup Time

ns (min)

SPI_Data Hold Time

ns (min)

SPI_CLK Setup Time

ns (min)

SPI_CLK High Pulse Width

100

ns (min)

SPI_CLK Low Pulse Width

100

ns (min)

CLK

SPI_CLK Frequency

MHz (max)

CLKI2SI

2S_CLK Period

ns (min)

HII2SI

2S_CLK High Pulse Width

ns (min)

LOI2S

2S_CLK Low Pulse Width

ns (min)

2S_LRCLK Duty Cycle

SLRCLK

2S_LRCLK to I2S_CLK Setup Time

ns (min)

HLRCLK

2S_LRCLK to I2S_CLK Hold Time

ns (min)

SDI2SI

2S_Data to I2S_CLK Setup Time

ns (min)

HDI2SI

2S_Data to I2S_CLK Hold Time

ns (min)

Note 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 guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which

guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit

is given, however, the typical value is a good indication of device performance.

Note 2: All voltages are measured with respect to the GND pin, unless otherwise specified.

Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature TA. The maximum

allowable power dissipation is PDMAX =(TJMAX–TA)/θJA or the number given in Absolute Maximum Ratings, whichever is lower.

Note 4: Human body model, 100pF discharged through a 1.5k

Ω resistor.

Note 5: Machine Model, 220pF – 240pF discharged through all pins.

Note 6: Typicals are measured at 25˚C and represent the parametric norm.

Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 8: Best operation is achieved by maintaining 3.0V

≤ AVDD ≤ 5.0V and 3.0V ≤ DVDD ≤ 5.0V.

Note 9: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.

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