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參數(shù)資料
型號: ADSP-21161NCCA-100
廠商: ANALOG DEVICES INC
元件分類: 數(shù)字信號處理
英文描述: DSP Microcomputer
中文描述: 48-BIT, 27.5 MHz, OTHER DSP, PBGA225
封裝: 17 X 17 MM, MO-192AAF-2, BGA-225
文件頁數(shù): 52/60頁
文件大小: 1019K
代理商: ADSP-21161NCCA-100
ADSP-21161N
–52–
REV. A
Capacitive Loading
Output delays and holds are based on standard capacitive loads:
30 pF on all pins (see
Figure 39 on Page 51
).
Figure 41
shows
graphically how output delays and holds vary with load capaci-
tance. (Note that this graph or derating does not apply to output
disable delays; see
Output Disable Time on Page 51
.) The graphs
of
Figure 41
,
Figure 42
, and
Figure 43
may not be linear outside
the ranges shown for Typical Output Delay vs. Load Capacitance
and Typical Output Rise Time (20% – 80%, V = Min) vs. Load
Capacitance.
Environmental Conditions
The thermal characteristics in which the DSP is operating
influence performance.
Thermal Characteristics
The ADSP-21161N is packaged in a 225-ball Mini Ball Grid
Array (MBGA). The ADSP-21161N is specified for a case tem-
perature (
T
CASE
). To ensure that the
T
CASE
data sheet specification
is not exceeded, a heatsink and/or an air flow source may be used.
Use the center block of ground pins (MBGA balls: F6-10,
G6-10, H6-10, J6-10, K6-10) to provide thermal pathways to the
printed circuit board’s ground plane. A heatsink should be
attached to the ground plane (as close as possible to the thermal
pathways) with a thermal adhesive.
where:
T
CASE
= Case temperature (measured on top surface
of package)
PD
= Power dissipation in W (this value depends upon
the specific application; a method for calculating PD is
shown under Power Dissipation).
θ
CA
= Value from
Table 38
.
θ
JB
= 8.0°C/W
Figure 41. Typical Output Delay or Hold vs. Load
Capacitance (at Max Case Temperature)
Figure 42. Typical Output Rise/Fall Time (20% – 80%,
V
DDEXT
= Max)
Figure 43. Typical Output Rise/Fall Time (20% – 80%,
V
DDEXT
= Min)
LOAD CAPACITANCE – pF
25
–5
0
210
30
60
90
120
150
180
20
15
10
5
NOMINAL
Y = 0.0835X - 2.42
O
LOAD CAPACITANCE – pF
16.0
8.0
00
200
20
40
60
80
100
120
140
160
180
14.0
12.0
4.0
2.0
10.0
6.0
FALL TIME
RISE TIME
Y = 0.0743X + 1.5613
R
(
Y = 0.0414X + 2.0128
LOAD CAPACITANCE – pF
16.0
8.0
00
200
20
40
60
80
100
120
140
160
180
14.0
12.0
4.0
2.0
10.0
6.0
FALL TIME
RISE TIME
Y = 0.0773X + 1.4399
R
(
Y = 0.0417X + 1.8674
Table 38. Airflow Over Package Versus
θ
CA
Airflow (Linear Ft./Min.)
θ
CA
(°C/W)
1
0
17.9
200
15.2
400
13.7
1
θ
JC
= 6.8°C/W.
T
CASE
T
AMB
PD
θ
CA
×
(
)
+
=
相關(guān)PDF資料
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