Datasheet

ADSP-BF592
Rev. B | Page 37 of 44 | July 2013
TEST CONDITIONS
All timing parameters appearing in this data sheet were mea-
sured under the conditions described in this section. Figure 34
shows the measurement point for ac measurements (except out-
put enable/disable). The measurement point V
MEAS
is V
DDEXT
/2
for V
DDEXT
(nominal) = 1.8 V/2.5 V/3.3 V.
Output Enable Time Measurement
Output pins are considered to be enabled when they have made
a transition from a high impedance state to the point when they
start driving.
The output enable time t
ENA
is the interval from the point when
a reference signal reaches a high or low voltage level to the point
when the output starts driving as shown on the right side of
Figure 35.
Figure 30. Driver Type B Current (1.8V V
DDEXT
)
Figure 31. Driver Type C Current (3.3V V
DDEXT
)
Figure 32. Driver Type C Current (2.5V V
DDEXT
)
0
SOURCE CURRENT (mA)
SOURCE VOLTAGE (V)
0 0.5 1.0 1.5
30
20
–30
–10
V
OL
V
DDEXT
= 1.9V @ – 40 ° C
V
DDEXT
= 1.8V @ 25 ° C
–20
–40
10
40
V
DDEXT
= 1.7V @ 105 ° C
50
–50
0
SOURCE CURRENT (mA)
SOURCE VOLTAGE (V)
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
90
60
– 90
– 30
V
OL
V
OH
V
DDEXT
= 3.6V @ – 40 ° C
V
DDEXT
= 3.3V @ 25 ° C
– 60
– 150
30
120
V
DDEXT
= 3.0V @ 105 ° C
– 120
150
0
SOURCE CURRENT (mA)
SOURCE VOLTAGE (V)
0 0.5 1.0 1.5 2.0 2.5
100
– 100
– 25
V
OL
V
OH
V
DDEXT
= 2.75V @ – 40 ° C
V
DDEXT
= 2.5V @ 25 ° C
– 50
V
DDEXT
= 2.25V @ 105 ° C
– 75
25
50
75
Figure 33. Driver Type C Current (1.8V V
DDEXT
)
Figure 34. Voltage Reference Levels for AC
Measurements (Except Output Enable/Disable)
Figure 35. Output Enable/Disable
0
SOURCE CURRENT (mA)
SOURCE VOLTAGE (V)
0 0.5 1.0 1.5
60
40
–60
–20
V
OL
V
OH
V
DDEXT
= 1.9V @ – 40 ° C
V
DDEXT
= 1.8V @ 25 ° C
–40
20
V
DDEXT
= 1.7V @ 105 ° C
INPUT
OR
OUTPUT
V
MEAS
V
MEAS
REFERENCE
SIGNAL
t
DIS
OUTPUT STARTS DRIVING
V
OH
(MEASURED) ⴚ ⌬V
V
OL
(MEASURED) + ⌬V
t
DIS_MEASURED
V
OH
(MEASURED)
V
OL
(MEASURED)
V
TRIP
(HIGH)
V
OH
(MEASURED
)
V
OL
(MEASURED)
HIGH IMPEDANCE STATE
OUTPUT STOPS DRIVING
t
ENA
t
DECAY
t
ENA_MEASURED
t
TRIP
V
TRIP
(LOW)