參數(shù)資料
型號: ADSP-2111BG-80
廠商: Analog Devices Inc
文件頁數(shù): 20/64頁
文件大?。?/td> 0K
描述: IC DSP CONTROLLER 16BIT 100PGA
標(biāo)準(zhǔn)包裝: 1
系列: ADSP-21xx
類型: 定點
接口: 主機(jī)接口,串行端口
時鐘速率: 20MHz
非易失內(nèi)存: 外部
芯片上RAM: 6kB
電壓 - 輸入/輸出: 5.00V
電壓 - 核心: 5.00V
工作溫度: -40°C ~ 85°C
安裝類型: 通孔
封裝/外殼: 100-BPGA
供應(yīng)商設(shè)備封裝: 100-PGA(33.53x33.53)
包裝: 托盤
ADSP-21xx
REV. B
–27–
POWER DISSIPATION EXAMPLE
To determine total power dissipation in a specific application,
the following equation should be applied for each output:
C
× V
DD
2
× f
C = load capacitance, f = output switching frequency.
Example:
In an ADSP-2103 application where external data memory is
used and no other outputs are active, power dissipation is
calculated as follows:
Assumptions:
External data memory is accessed every cycle with 50% of the
address pins switching.
External data memory writes occur every other cycle with
50% of the data pins switching.
Each address and data pin has a 10 pF total load at the pin.
The application operates at V
DD = 3.3 V and tCK = 100 ns.
Total Power Dissipation = PINT + (C
× V
DD
2
× f )
PINT = internal power dissipation (from Figure 23).
(C
× V
DD
2
× f ) is calculated for each output:
# of
Output
Pins
× C
× V
DD
2
× f
Address, DMS 8
× 10 pF × 3.32 V × 10 MHz = 8.71 mW
Data, WR
9
× 10 pF × 3.32 V × 5 MHz = 4.90 mW
RD
1
× 10 pF × 3.32 V × 5 MHz = 0.55 mW
CLKOUT
1
× 10 pF × 3.32 V × 10 MHz = 1.09 mW
15.25 mW
Total power dissipation for this example = PINT + 15.25 mW.
ENVIRONMENTAL CONDITIONS
Ambient Temperature Rating:
TAMB = TCASE – (PD × θCA)
TCASE = Case Temperature in
°C
PD = Power Dissipation in W
θ
CA = Thermal Resistance (Case-to-Ambient)
θ
JA = Thermal Resistance (Junction-to-Ambient)
θ
JC = Thermal Resistance (Junction-to-Case)
Package
θ
JA
θ
JC
θ
CA
PGA
27
°C/W
16
°C/W
11
°C/W
PQFP
60
°C/W
18
°C/W
42
°C/W
SPECIFICATIONS (ADSP-2103/2162/2164)
Figure 25. Typical Output Valid Delay or Hold vs. Load
Capacitance, C
L (at Maximum Ambient Operating Temperature)
Figure 24. Typical Output Rise Time vs. Load Capacitance, C
L
(at Maximum Ambient Operating Temperature)
CAPACITIVE LOADING
Figures 24 and 25 show capacitive loading characteristics for the
ADSP-2103, ADSP-2162, and ADSP-2164.
25
150
125
100
75
CL – pF
50
RISE
TIME
(0.8V-2.0V)
ns
30
10
5
15
20
25
VDD = 3.0V
VALID
OUTPUT
DELAY
OR
HOLD
ns
–2
+4
+2
+6
NOMINAL
25
150
125
100
75
C L – pF
50
+8
VDD = 3.0V
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