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參數(shù)資料
| 型號： | ADSP-21065LCCA-240 |
| 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： | 32-BIT, 33.33 MHz, OTHER DSP, PBGA196 |
| 封裝： | CHIP SCALE, MS-034AAE-1, BGA-196 |
| 文件頁數(shù)： | 38/44頁 |
| 文件大?。?/td> | 416K |
| 代理商： | ADSP-21065LCCA-240 |
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REV. C
ADSP-21065L
–38–
POWER DISSIPATION
Total power dissipation has two components: one due to inter-
nal circuitry and one due to the switching of external output
drivers. Internal power dissipation depends on the sequence in
which instructions execute and the data operands involved. See
I
DDIN
calculation in Electrical Characteristics section. Internal
power dissipation is calculated this way:
P
INT
= I
DDIN
￥
V
DD
The external component of total power dissipation is caused by
the switching of output pins. Its magnitude depends on:
– the number of output pins that switch during each cycle (O)
– the maximum frequency at which the pins can switch (f)
– the load capacitance of the pins (C)
– the voltage swing of the pins (V
DD
).
The external component is calculated using:
P
EXT
= O
￥
C
￥
V
DD2
￥
f
The load capacitance should include the processor’s package
capacitance (C
IN
). The frequency f includes driving the load
high and then back low. Address and data pins can drive high
and low at a maximum rate of 1/t
CK
while in SDRAM burst
mode.
Example:
Estimate P
EXT
with the following assumptions:
– a system with one bank of external memory (32-bit)
– two 1M
￥
16 SDRAM chips, each with a control signal load
of 3 pF and a data signal load of 4 pF
– external data writes occur in burst mode, two every 1/t
CK
cycles, a potential frequency of 1/t
CK
cycles/s. Assume 50%
pin switching
– the external SDRAM clock rate is 60 MHz (2/t
CK
).
The P
EXT
equation is calculated for each class of pins that can
drive:
Table V. External Power Calculations
Pin
Type
# of
Pins Switching
%
C
f
V
DD2
= P
EXT
Address
MS
0
SDWE
Data
SDRAM CLK 1
11
1
1
32
50
0
0
50
–
￥
10.7
￥
10.7
￥
10.7
￥
7.7
￥
10.7
￥
30 MHz
—
—
￥
30 MHz
￥
30 MHz
￥
10.9 V
￥
10.9 V
￥
10.9 V
￥
10.9 V
￥
10.9 V
= 0.019 W
= 0.000 W
= 0.000 W
= 0.042 W
= 0.007 W
P
EXT
= 0.068 W
A typical power consumption can now be calculated for these
conditions by adding a typical internal power dissipation. (I
DDIN
see calculation in Electrical Characteristics section):
P
TOTAL
= P
EXT
+
(
I
DDIN
￥
V
DD
)
Note that the conditions causing a worst-case P
EXT
differ from
those causing a worst-case P
INT
. Maximum P
INT
cannot occur
while 100% of the output pins are switching from all ones (1s)
to all zeros (0s). Note also that it is not common for an appli-
cation to have 100% or even 50% of the outputs switching
simultaneously.
ENVIRONMENTAL CONDITIONS
Thermal Characteristics
The ADSP-21065L is offered in a 208-lead MQFP and a 196-
ball Mini-BGA package.
The ADSP-21065L is specified for a case temperature (T
CASE
)
.
To ensure that T
CASE
is not exceeded, an air flow source may be
used.
T
CASE
= T
AMB
+
(
PD
￥
q
CA
)
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)
q
J
C
=
q
J
C
=
7.1
∞
C/W for 208-lead MQFP
5.1
∞
C/W for 196-ball Mini-BGA
Airflow
Table VI. Thermal Characteristics (208-Lead MQFP)
(Linear Ft./Min.)
q
CA
(
∞
C/W)
0
100
200
400
600
24
20
19
17
13
Table VII. 196-Ball Mini-BGA
(Linear Ft./Min.)
q
CA
(
∞
C/W)
0
200
400
38
29
23
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| ADSP-21065LCCAZ240 | 功能描述:IC DSP CTLR 32BIT 196CSPBGA RoHS:是 類別:集成電路 (IC) >> 嵌入式 - DSP（數(shù)字式信號處理器） 系列:SHARC® 標準包裝:2 系列:StarCore 類型:SC140 內(nèi)核 接口:DSI，以太網(wǎng)，RS-232 時鐘速率:400MHz 非易失內(nèi)存:外部 芯片上RAM:1.436MB 電壓 - 輸入/輸出:3.30V 電壓 - 核心:1.20V 工作溫度:-40°C ~ 105°C 安裝類型:表面貼裝 封裝/外殼:431-BFBGA，F(xiàn)CBGA 供應商設(shè)備封裝:431-FCPBGA（20x20） 包裝:托盤 |
| ADSP-21065LCS-240 | 制造商:Analog Devices 功能描述:DSP Floating-Point 32-Bit 60MHz 60MIPS 208-Pin MQFP 制造商:Analog Devices 功能描述:IC MICROCOMPUTER 32-BIT |
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