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参数资料
| 型号： | ADSP-2188NKSTZ-320 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/48页 |
| 文件大小： | 0K |
| 描述： | IC DSP CONTROLLER 16BIT 100LQFP |
| 标准包装： | 1 |
| 系列： | ADSP-21xx |
| 类型： | 定点 |
| 接口： | 主机接口，串行端口 |
| 时钟速率： | 80MHz |
| 非易失内存： | 外部 |
| 芯片上RAM： | 256kB |
| 电压 - 输入/输出： | 1.8V，2.5V，3.3V |
| 电压 - 核心： | 1.80V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 100-LQFP |
| 供应商设备封装： | 100-LQFP（14x14） |
| 包装： | 托盘 |
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Rev. A
|
Page 24 of 48
|
August 2006
ADSP-218xN
ESD DIODE PROTECTION
During the power-up sequence of the DSP, differences in the
ramp-up rates and activation time between the two supplies can
cause current to flow in the I/O ESD protection circuitry. To
prevent damage to the ESD diode protection circuitry, Analog
Devices recommends including a bootstrap Schottky diode.
The bootstrap Schottky diode is connected between the core
and I/O power supplies, as shown in Figure 17. It protects the
ADSP-218xN processor from partially powering the I/O supply.
Including a Schottky diode will shorten the delay between the
supply ramps and thus prevent damage to the ESD diode pro-
tection circuitry. With this technique, if the core rail rises ahead
of the I/O rail, the Schottky diode pulls the I/O rail along with
the core rail.
POWER DISSIPATION
To determine total power dissipation in a specific application,
the following equation should be applied for each output: C
VDD
2
f
where:
C = load capacitance.
f = output switching frequency.
Example:
In an 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.
Application operates at VDDEXT = 3.3 V and tCK = 30 ns.
Total Power Dissipation = PINT + (C
VDDEXT
2
f)
(C
VDDEXT
2
f) is calculated for each output, as in the exam-
ple in Table 13.
Figure 17. Dual Voltage Schottky Diode
I/O VOLTAGE
REGULATOR
CORE
VOLTAGE
REGULATOR
VDDEXT
VDDINT
ADSP-218xN
DC INPUT
SOURCE
Table 13. Example Power Dissipation Calculation1
Parameters
No. of Pins
× C (pF)
× VDDEXT
2 (V)
× f (MHz)
PD (mW)
Address
7
10
3.32
20.0
15.25
Data Output, WR
910
3.3
2
20.0
19.59
RD
110
3.3
2
20.0
2.18
CLKOUT, DMS
210
3.3
2
40.0
8.70
45.72
1 Total power dissipation for this example is PINT + 45.72 mW.
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