參數(shù)資料
型號(hào)： PCI-ADC
英文描述： MULTIFUNKTIONSKARTE 44 KANAL PCI BUS
中文描述： MULTIFUNKTIONSKARTE 44卡納爾PCI總線
文件頁(yè)數(shù)： 14/35頁(yè)
文件大小： 124K
代理商： PCI-ADC
Page 6
Programming Details
Chapter 3
Page 6
01270193.doc
Blue Chip Technology Ltd.
Analogue Inputs
Each analogue sample is represented on the PCI data bus as a 16 bit word, the
lower 12 bits of which represent the analogue value, and the upper four bits
represent the channel number.
The analogue sample is represented by a twelve bit two’s complement number,
i.e.
+5 volts (+ve full scale) gives a code of 07FF
h
zero volts input produces a code of 0000
h
and
-5 volts (-ve full scale) gives a code of 0800
h
The basic analogue to digital converter has a full scale input of ± 5 volts. The
on-board programmable gain amplifier allows for lesser voltages at the input
pins. Note that there is no indication of an over-voltage input condition. The
value returned will simply be full scale. The user must ensure that the inputs
remain within the full scale input range selected.
The channels number is represented by a binary four bit word. In single ended
mode this number is between 0 and 15 and in differential mode it is between 0
and 7.
The format of the analogue input sample is shown below:-
Analogue Input Sample
(Base 3 + 0) Read only
Function
(0 - 15 for single ended inputs)
(0 - 7 for differential inputs)
Bit no.
b15..b12
Converted channel number
b11..b0
Two’s complement analogue input sample
FIFO Memory
The Analogue Input Samples are stored in a 16-bit wide, 1024-word deep
First-In, First-Out (FIFO) memory.
FIFO memory is well suited to transferring data between two asynchronous
systems i.e. between the regular, clocked analogue samples, and irregular,
software dependent processor intervention.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCIB24W9M400A1 制造商:Positronic Industries 功能描述:
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PCIC16W7M400C1 制造商:Positronic Industries 功能描述:
PCI-C588 功能描述:界面模塊 8 PORT ASYNC SERIAL COMM PCI CARD RoHS:否 制造商:4D Systems 產(chǎn)品:Serial Converters 通道/端口數(shù)量: 數(shù)據(jù)速率: 接口類(lèi)型:USB, UART 工作電源電壓:3.3 V, 5 V 最大工作溫度:
PCI-C6600S4-2-67-167 制造商:Johnson Components 功能描述:SBC;DSP, 2 C9701, 2MB SRAM, IN
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