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參數(shù)資料
| 型號： | AMC7820-EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | AMC7820 Evaluation Module(AMC7820評估模塊) |
| 中文描述： | AMC7820評估模塊（AMC7820評估模塊） |
| 文件頁數(shù)： | 11/26頁 |
| 文件大?。?/td> | 297K |
| 代理商： | AMC7820-EVM |
The digital control interface is either through the PC parallel port, or an external SPI bus.
The PC parallel port can be disabled, allowing the external SPI bus to control the
AMC7820. When using the PC parallel port, the digital interface voltage is 5V; when the
external SPI bus is used, the digital interface voltage may be 5V or 3V.
Power supplies are to be provided to the AMC7820-EVM through external connectors from
an external, user-supplied laboratory power supply. AV
DD
and DV
DD
must be supplied at
+5V, while BV
DD
can range from +2.7V to +5V.
A thermistor can be connected to the AMC7820 through a terminal block. The thermistor
is driven by a current source on the AMC7820, which is derived from the reference and
set by the ISET resistor. The ISET resistor (see Figure 1) is identified as R2 on the
AMC7820-EVM, and is socketed on the EVM so that the user can change its value.
All the remaining pins of the AMC7820 (i.e., all the analog inputs and outputs) are brought
out to a large prototype area on the AMC7820-EVM, so that external connections and
circuitry can be made in any manner the user wishes.
Introduction
1.3 Analog Inputs/Outputs
The analog inputs and outputs of the AMC7820 are available on the prototyping area and
are identified on the silkscreen. These include the op amps, A/D converter inputs, and
D/A converter outputs. Note that the direct inputs to the A/D converter (CH2-CH5) are not
buffered inside the AMC7820, and so should connect only to extremely-low impedance
sources, or should be buffered externally.
An external reference may be provided to the AMC7820 through J6. This reference
voltage must remain within the specifications of the AMC7820. Consult the AMC7820 data
sheet (SBAS231) at www.ti.com for these and other device specifications.
The AMC7820 connects to a thermistor through J7. The nominal value of this thermistor
is typically 10k
.
Since the AMC7820
’
s A/D converter runs at 100kHz, and must scan through eight
channels, each channel
’
s effective conversion time is 80
μ
s. This means that each
channel
’
s effective sampling rate is 12.5kHz. Input signals above 6.25kHz, therefore,
would result in aliasing, unless external anti-aliasing filters are provided.
The voltage range of all the analog inputs and outputs of the AMC7820 are from 0V to 5V.
Note that the D/A converters
’
outputs may be configured to range from 0V to V
REF
or from
0V to 2V
REF
. See the AMC7820 data sheet for details on the operating ranges of the
analog inputs and outputs.
1.4 Prototyping Area
The large prototype area of the AMC7820 provides plenty of room for external circuitry to
be connected to the AMC7820. Every analog signal from the AMC7820 (except for the
reference and thermistor connections, which are available on J6 and J7) is brought out to
the edge of the prototype area. Five holes at each signal point are connected together to
allow several connection points for external circuitry.
Six large areas of copper are available for use as heatsinks for power devices. These
copper areas are isolated from all other signals.
1-3
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| AMC7820Y | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ANALOG MONITORING AND CONTROL |
| AMC7820Y/250 | 功能描述:數(shù)據(jù)轉(zhuǎn)換系統(tǒng) Analog Monitoring & Control Circuitry RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率:0.001 MSPs 分辨率:24 bit 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| AMC7820Y/250G4 | 功能描述:數(shù)據(jù)轉(zhuǎn)換系統(tǒng) Analog Monitoring & Control Circuitry RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率:0.001 MSPs 分辨率:24 bit 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| AMC7820Y/2K | 功能描述:數(shù)據(jù)轉(zhuǎn)換系統(tǒng) Analog Monitoring & Control Circuitry RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率:0.001 MSPs 分辨率:24 bit 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| AMC7820Y/2KG4 | 功能描述:數(shù)據(jù)轉(zhuǎn)換系統(tǒng) Analog Monitoring & Control Circuitry RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率:0.001 MSPs 分辨率:24 bit 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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