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參數資料
型號: ADSP2104
廠商: Analog Devices, Inc.
英文描述: Low Cost DSP Microcomputers
中文描述: 低成本DSP單片機
文件頁數: 15/36頁
文件大小: 333K
代理商: ADSP2104
ADSP-2104/ADSP-2109
REV. 0
–15–
T E ST CONDIT IONS
Figure 10 shows voltage reference levels for ac measurements.
3.0V
1.5V
0.0V
2.0V
1.5V
0.8V
INPUT
OUTPUT
Figure 10. Voltage Reference Levels for AC Measurements
(Except Output Enable/Disable)
Output Disable T ime
Output pins are considered to be disabled when they have
stopped driving and started a transition from the measured
output high or low voltage to a high impedance state. T he
output disable time (t
DIS
) is the difference of t
MEASURED
and
t
DECAY
, as shown in Figure 11. T he time t
MEASURED
is the
interval from when a reference signal reaches a high or low
voltage level to when the output voltages have changed by 0.5 V
from the measured output high or low voltage.
T he decay time, t
DECAY
, is dependent on the capacitative load,
C
L
, and the current load, i
L
, on the output pin. It can be
approximated by the following equation:
t
DECAY
=
C
L
×
0.5
V
i
L
from which
t
DIS
=
t
MEASURED
t
DECAY
is calculated. If multiple pins (such as the data bus) are dis-
abled, the measurement value is that of the last pin to stop
driving.
Output E nable T ime
Output pins are considered to be enabled when they have made
a transition from a high-impedance state to when they start
driving. T he output enable time (t
E NA
) is the interval from
when a reference signal reaches a high or low voltage level to
when the output has reached a specified high or low trip point,
as shown in Figure 11. If multiple pins (such as the data bus)
are enabled, the measurement value is that of the first pin to
start driving.
SPECIFICATIONS (ADSP-2104/ADSP-2109)
Figure 12. Equivalent Device Loading for AC Measurements
(Except Output Enable/Disable)
2.0V
1.0V
t
ENA
REFERENCE
SIGNAL
OUTPUT
t
DECAY
V
OH
(MEASURED)
OUTPUT STOPS
DRIVING
OUTPUT STARTS
DRIVING
t
DIS
t
MEASURED
V
OL
(MEASURED)
V
OH
(MEASURED) – 0.5V
V
OL
(MEASURED) +0.5V
HIGH-IMPEDANCE STATE.
TEST CONDITIONS CAUSE
THIS VOLTAGE LEVEL TO BE
APPROXIMATELY 1.5V.
V
OH
(MEASURED)
V
OL
(MEASURED)
Figure 11. Output Enable/Disable
TO
OUTPUT
PIN
50pF
+1.5V
I
OH
I
OL
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相關代理商/技術參數
參數描述
ADSP-2104 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost DSP Microcomputers
ADSP-2104BP-80 制造商:Analog Devices 功能描述:DSP Fixed-Point 16-Bit 20MHz 20MIPS 68-Pin PLCC 制造商:Analog Devices 功能描述:IC MICROCOMPUTER 16-BIT
ADSP-2104BPZ-80 功能描述:IC DSP CONTROLLER 16BIT 68PLCC RoHS:是 類別:集成電路 (IC) >> 嵌入式 - DSP(數字式信號處理器) 系列:ADSP-21xx 標準包裝:2 系列:StarCore 類型:SC140 內核 接口:DSI,以太網,RS-232 時鐘速率:400MHz 非易失內存: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,FCBGA 供應商設備封裝:431-FCPBGA(20x20) 包裝:托盤
ADSP-2104KP-80 制造商:Analog Devices 功能描述:DSP Fixed-Point 16-Bit 20MHz 20MIPS 68-Pin PLCC 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述:Low cost DSP microcomputer 1 timer 4.5
ADSP-2104L 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ADSP-2104/ADSP-2104L: Low Cost DSP Microcomputers Data Sheet (Rev. 0. 7/96)
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