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参数资料
| 型号： | ADSP-2191MKSTZ-160 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 数字信号处理 |
| 英文描述： | 16-bit Fixed-Point DSP, 160 MIPS, 160K bytes RAM; Package: 144 ld LQFP (20x20mm); No of Pins: 144; Temperature Range: Comm. |
| 中文描述： | 16-BIT, 100 MHz, OTHER DSP, PQFP144 |
| 封装： | PLASTIC, LQFP-144 |
| 文件页数： | 36/48页 |
| 文件大小： | 1789K |
| 代理商： | ADSP-2191MKSTZ-160 |
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–41–
REV. A
ADSP-2191M
The output disable time t
DIS is the difference between tMEASURED
and t
interval from when the reference signal switches to when the
output voltage decays –V from the measured output high or
output low voltage. The t
DECAY is calculated with test loads CL
and I
L, and with – V equal to 0.5 V.
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
ENA is the interval from 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 the Output Enable/Disable diagram (Figure 26). If multiple
pins (such as the data bus) are enabled, the measurement value
is that of the first pin to start driving.
Example System Hold Time Calculation
To determine the data output hold time in a particular system,
first calculate t
DECAY using the equation at Output Disable Time
on Page 40. Choose –V to be the difference between the
ADSP-2191M’s output voltage and the input threshold for the
device requiring the hold time. A typical –V will be 0.4 V. C
L is
the total bus capacitance (per data line), and I
L is the total leakage
or three-state current (per data line). The hold time will be t
DECAY
plus the minimum disable time (i.e., t
DATRWH for the
write cycle).
Capacitive Loading
Output delays and holds are based on standard capacitive loads:
50 pF on all pins (see Figure 30). The delay and hold specifica-
tions given should be derated by a factor of 1.5 ns/50 pF for loads
show how output rise time varies with capacitance. These figures
also show graphically how output delays and holds vary with load
capacitance. (Note that this graph or derating does not apply to
output disable delays; see Output Disable Time on Page 40.) The
graphs in these figures may not be linear outside the ranges
shown.
Environmental Conditions
The thermal characteristics in which the DSP is operating
influence performance.
Thermal Characteristics
The ADSP-2191M comes in a 144-lead LQFP or 144-lead Ball
Grid Array (mini-BGA) package. The ADSP-2191M is specified
for an ambient temperature (T
AMB) as calculated using the
formula below.
Figure 26. Output Enable/Disable
Figure 27. Equivalent Device Loading for AC
Measurements (Includes All Fixtures)
Figure 28. Voltage Reference Levels for AC
Measurements (Except Output Enable/Disable)
t
DECAY
C
L V
I
L
---------------
=
REFERENCE
SIGNAL
tDIS
OUTPUT STARTS
DRIVING
VOH (MEASURED) – V2.0V
VOL (MEASURED) + V1.0V
tMEASURED
VOH (MEASURED)
VOL (MEASURED)
HIGH IMPEDANCE STATE.
TEST CONDITIONS CAUSE THIS VOLTAGE
TO BE APPROXIMATELY 1.5V
OUTPUT STOPS
DRIVING
tDECAY
tENA
1.5V
50pF
TO
OUTPUT
PIN
IOL
IOH
INPUT
OR
OUTPUT
1.5V
Figure 29. Typical Output Rise Time (10%-90%,
VDDEXT = Minimum at Maximum Ambient Operating
Temperature) vs. Load Capacitance
40
0
30
20
10
LOAD CAPACITANCE – pF
0250
50
100
150
200
R
IS
E
A
N
D
F
A
L
T
IM
E
S
–
n
s
(1
0
%
–
9
0
%
)
FALL TIME
RISE TIME
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