wm9709 Wolfson Microelectronics plc, wm9709 Datasheet - Page 7

• Manufacturer Part Number: wm9709
• Description: Ac-link Interface Audio Dac
• Manufacturer: Wolfson Microelectronics plc

Production Data
SIGNAL RISE AND FALL TIMES
w
Figure 4 ATE Test Mode Timing
Notes:
1.
2.
3.
Figure 5 Signal Rise and Fall Times (50pF external load)
PARAMETER
Setup to trailing edge of RESETB
(also applies to SYNC)
Rising edge of RESETB to Hi-Z
delay
SDATAOUT
SDATAOUT
All WM9709 signals are normally low through the trailing edge of RESETB. Bringing
SDATAOUT high for the trailing edge of RESETB causes WM9709’s AC-link outputs to go high
impedance, which is suitable for ATE in circuit testing.
A vendor specific internal test mode can be entered by bringing SYNC high for the trailing edge
of RESETB. This mode has no effect on WM9709 AC-link output signal levels.
Once either of the two test modes have been entered, WM9709 must be issued another
RESETB with all AC-link signals low to return to the normal operating mode.
SDATAIN,
SDATAIN
RESETB
BITCLK
BITCLK
SYNC
t rise
t rise
t rise
t rise
SYNC
DOUT
CLK
DIN
t
setup2rst
t
off
t fall
t fall
SYMBOL
t fall
t fall
T
setup2rst
T
DOUT
SYNC
CLK
DIN
off
Hi-Z
15.0
MIN
-
TYP
-
-
PD Rev 1.3 February 2003
MAX
25.0
-
WM9709
UNIT
nS
nS
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