Serial Audio Port

t

h1

t

su1

t

su2

t

h2

SCLK

(Input)

LRCLK

(Input)

SDIN1

SDIN2

SDIN3

T0026-01

TAS5086 Pin-Related Characteristics of the SDA and SCL I/O Stages for F/S-Mode I

2C-Bus

TAS5086

www.ti.com ................................................................................................................................................... SLES131C – FEBRUARY 2005 – REVISED JUNE 2008

Serial audio port slave mode over recommended operating conditions (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

fSCLKIN SCLK input frequency

CL = 30 pF, SCLK = 64 fS

2.048

12.288

MHz

tsu1

Setup time, LRCLK to SCLK rising edge

10

ns

th1

Hold time, LRCLK from SCLK rising edge

10

ns

tsu2

Setup time, SDIN to SCLK rising edge

10

ns

th2

Hold time, SDIN from SCLK rising edge

10

ns

LRCLK frequency

32

48

192

kHz

SCLK duty cycle

40%

50%

60%

LRCLK duty cycle

40%

50%

60%

SCLK

SCLK rising edges between LRCLK rising edges

64

64

edges

LRCLK clock edge with respect to the falling edge of

SCLK

–1/4

1/4

SCLK

period

Figure 2. Slave Mode Serial Data Interface Timing

Devices

STANDARD MODE

FAST MODE

PARAMETER

TEST CONDITIONS

UNIT

MIN

MAX

MIN

MAX

VIL

LOW-level input voltage

–0.5

0.3 VDD

–0.5

0.3 VDD

V

VIH

HIGH-level input voltage

0.7 VDD

0.7 VDD

V

Vhys

Hysteresis of Schmitt-trigger inputs

N/A

N/A

0.05 VDD

V

LOW-level output voltage (open drain or

VOL1

3-mA sink current

0

0.4

V

open collector)

Bus capacitance from 10 pF

7 + 0.1 Cb

tof

Output fall time from VIHmin to VILmax

250

250

ns

to 400 pF

(1)

tSP

Pulse duration of spikes suppressed(2)

N/A

N/A

0

30

ns

Ii

Input current, each I/O pin

–30

30

–30(3)

30(3)

µA

Ci

Capacitance, each I/O pin

10

10

pF

(1)

Cb = capacitance of one bus line in pF. The output fall time is faster than the standard I

2C specification.

(2)

SCL and SDA have a 30-ns glitch filter.

(3)

The I/O pins of fast-mode devices must not obstruct the SDA and SDL lines if VDD is switched off.

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