48 kHz, single codec configuration, (primary mode) unless otherwise noted. Limits apply for T

is 1 Vrms unless otherwise specified. (Continued)

Symbol

Parameter

Conditions

LM4549B

Units

(Limits)

Typical

(Note 6)

Limit

(Note 7)

T

SHOLD

Hold Time for codec SYNC

inpu(Note 9)t

Hold time of SYNC from falling edge of

BIT_CLK

10

ns (min)

T

CO

Output Valid Delay

Output Delay of SDATA_IN from rising

edge of BIT_CLK

5.2

15

ns (max)

T

RISE

Rise Time(Note 9)

BIT_CLK, SYNC, SDATA_IN or

SDATA_OUT

6

ns (max)

T

FALL

Fall Time(Note 9)

BIT_CLK, SYNC, SDATA_IN or

SDATA_OUT

6

ns (max)

T

RST_LOW

RESET# active low pulse width(Note

9)

For Cold Reset

1.0

µs (min)

T

RST2CLK

RESET# inactive to BIT_CLK start

up

For Cold Reset

271

162.8

ns (min)

T

SH

SYNC active high pulse width(Note

9)

For Warm Reset

1.0

µs (min)

T

SYNC2CLK

SYNC inactive to BIT_CLK start up

For Warm Reset

162.8

ns (min)

T

S2_PDOWN

AC Link Power Down Delay

Delay from end of Slot 2 to BIT_CLK,

SDATA_IN low

1

µs (max)

T

SUPPLY2RST

Power On Reset

Time from minimum valid supply levels

to end of Reset

1

µs (min)

T

SU2RST

Setup to trailing edge of

RESET#(Note 9)

For ATE Test Mode

15

ns (min)

T

RST2HZ

Rising edge of RESET# to

Hi-Z(Note 9)

For ATE Test Mode

25

ns (max)

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

Ω resistor.

Note 3: Machine Model, 220 pF – 240 pF discharged through all pins.

The typical junction-to-ambient thermal resistance is 74˚C/W for package number VBH48A.

Note 5: All voltages are measured with respect to the ground pin, unless otherwise specified.

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: Loopthrough mode describes a path from an analog input through the analog mixer to an analog output

Note 9: These specifications are guaranteed by design and characterization; they are not production tested.

Note 10: Out of band energy is measured from 28.8 kHz to 100 kHz relative toa1VrmsDAC output.

www.national.com

5