参数资料
型号: ADSP-2105BP-80
厂商: Analog Devices Inc
文件页数: 11/64页
文件大小: 0K
描述: IC DSP CONTROLLER 16BIT 68PLCC
标准包装: 19
系列: ADSP-21xx
类型: 定点
接口: 同步串行端口(SSP)
时钟速率: 20MHz
非易失内存: 外部
芯片上RAM: 3kB
电压 - 输入/输出: 5.00V
电压 - 核心: 5.00V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 68-LCC(J 形引线)
供应商设备封装: 68-PLCC(24.23x24.23)
包装: 管件
ADSP-21xx
REV. B
–19–
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-2101 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 = 5.0 V and tCK = 50 ns.
Total Power Dissipation = PINT + (C
× V
DD
2
× f )
PINT = internal power dissipation (from Figure 11).
(C
× V
DD
2
× f ) is calculated for each output:
# of
Output
Pins
× C
× V
DD
2
× f
Address, DMS 8
× 10 pF × 52 V × 20 MHz = 40.0 mW
Data, WR
9
× 10 pF × 52 V × 10 MHz = 22.5 mW
RD
1
× 10 pF × 52 V × 10 MHz = 2.5 mW
CLKOUT
1
× 10 pF × 52 V × 20 MHz = 5.0 mW
70.0 mW
Total power dissipation for this example = PINT + 70.0 mW.
ENVIRONMENTAL CONDITIONS
Ambient Temperature Rating:
TAMB = TCASE – (PD
× θ
CA)
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
18
°C/W
9
°C/W
9
°C/W
PLCC
27
°C/W
16
°C/W
11
°C/W
PQFP
60
°C/W
18
°C/W
42
°C/W
TQFP
60
°C/W
18
°C/W
42
°C/W
SPECIFICATIONS (ADSP-2101/2105/2115/2161/2163)
CAPACITIVE LOADING
Figures 12 and 13 show capacitive loading characteristics for the
ADSP-2101, ADSP-2105, ADSP-2115, and ADSP-2161/2163.
C
L
– pF
25
150
125
100
75
50
RISE
TIME
(0.8V
-
2.0V)
ns
V
DD
= 4.5V
8
7
6
5
4
3
2
1
0
175
0
Figure 12. Typical Output Rise Time vs. Load Capacitance, C
L
(at Maximum Ambient Operating Temperature)
Figure 13. Typical Output Valid Delay or Hold vs. Load
Capacitance, C
L (at Maximum Ambient Operating Temperature)
C
L
– pF
25
100
125
50
75
150
VALID
OUTPUT
DELAY
OR
HOLD
ns
V
DD
= 4.5V
175
0
5
4
3
2
1
0
–1
–2
–3
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