adsp-21161n Analog Devices, Inc., adsp-21161n Datasheet - Page 52

• Manufacturer Part Number: adsp-21161n
• Description: Dsp Microcomputer
• Manufacturer: Analog Devices, Inc.

ADSP-21161N
Figure 42. Typical Output Rise/Fall Time (20% – 80%,
V
Figure 43. Typical Output Rise/Fall Time (20% – 80%,
V
NOMINAL
Figure 41. Typical Output Delay or Hold vs. Load
Capacitance (at Max Case Temperature)
DDEXT
DDEXT
16.0
14.0
12.0
10.0
16.0
14.0
12.0
10.0
8.0
6.0
4.0
2.0
8.0
6.0
4.0
2.0
–5
25
20
15
10
0
0
5
0
0
= Max)
= Min)
0
20
20
30
40
40
Y = 0.0835X - 2.42
Y = 0.0773X + 1.4399
LOAD CAPACITANCE – pF
60
Y = 0.0743X + 1.5613
60
60
LOAD CAPACITANCE – pF
LOAD CAPACITANCE – pF
80
RISE TIME
RISE TIME
80
90
100
Y = 0.0417X + 1.8674
100
Y = 0.0414X + 2.0128
120
120
FALL TIME
120
FALL TIME
140
140
150
160
160
180
180
180
200
200
210
–52–
Capacitive Loading
Output delays and holds are based on standard capacitive loads:
30 pF on all pins (see
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
of
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
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:
Table 38. Airflow Over Package Versus
1
Airflow (Linear Ft./Min.)
CA
JC
Figure
T
of package)
PD = Power dissipation in W (this value depends upon
the specific application; a method for calculating PD is
shown under Power Dissipation).
CA
JB
CASE
= 6.8°C/W.
(°C/W)
= 8.0°C/W
= Value from
= Case temperature (measured on top surface
41,
CASE
1
Figure
). To ensure that the T
T
CASE
Output Disable Time on Page
42, and
Table
Figure 39 on Page
=
T
AMB
Figure 43
38.
+
0
17.9
CASE
PD
may not be linear outside
data sheet specification
51).
CA
200
15.2
Figure 41
CA
51.) The graphs
400
13.7
REV. A
shows