ADSP2115KP80

Manufacturer Part NumberADSP2115KP80
DescriptionPLCC-68
ManufacturerAnalog Devices
ADSP2115KP80 datasheet
 


Specifications of ADSP2115KP80

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ADSP-21xx
SPECIFICATIONS (ADSP-2111)
TEST CONDITIONS
Figure 20 shows voltage reference levels for ac measurements.
INPUT
OUTPUT
Figure 20. Voltage Reference Levels for AC Measurements
(Except Output Enable/Disable)
Output Disable Time
Output pins are considered to be disabled when they have
stopped driving and started a transition from the measured
output high or low voltage to a high impedance state. The
output disable time (t
) is the difference of t
DIS
t
, as shown in Figure 21. The time t
DECAY
interval from when a reference signal reaches a high or low
voltage level to when the output voltages have changed by 0.5 V
from the measured output high or low voltage.
REFERENCE
SIGNAL
V
(MEASURED)
OH
V
(MEASURED)
OL
The decay time, t
C
, and the current load, i
L
approximated by the following equation:
3.0V
1.5V
0.0V
from which
2.0V
1.5V
is calculated. If multiple pins (such as the data bus) are dis-
0.8V
abled, the measurement value is that of the last pin to stop
driving.
Output Enable Time
Output pins are considered to be enabled when they have made
a transition from a high-impedance state to when they start
driving. The output enable time (t
when a reference signal reaches a high or low voltage level to
when the output has reached a specified high or low trip point,
as shown in Figure 21. If multiple pins (such as the data bus)
and
MEASURED
are enabled, the measurement value is that of the first pin to
is the
MEASURED
start driving.
t
MEASURED
t
DIS
V
(MEASURED) – 0.5V
OH
OUTPUT
V
(MEASURED) +0.5V
OL
t
DECAY
OUTPUT STOPS
DRIVING
HIGH-IMPEDANCE STATE.
TEST CONDITIONS CAUSE
THIS VOLTAGE LEVEL TO BE
APPROXIMATELY 1.5V.
Figure 21. Output Enable/Disable
I
OL
TO
OUTPUT
PIN
50pF
I
OH
Figure 22. Equivalent Device Loading for AC Measurements
(Except Output Enable/Disable)
–24–
, is dependent on the capacitative load,
DECAY
, on the output pin. It can be
L
C
0.5 V
L
t
DECAY
i
L
t
= t
– t
DIS
MEASURED
DECAY
) is the interval from
E NA
t
ENA
V
(MEASURED)
OH
2.0V
1.0V
V
(MEASURED)
OL
OUTPUT STARTS
DRIVING
+1.5V
REV. B