參數(shù)資料
型號： DEM-ADS7864
廠商： Texas Instruments, Inc.
英文描述： ADC EVALUATION BOARD(ADC評估板)
中文描述： ADC的評估板（ADC的評估板）
文件頁數(shù)： 8/32頁
文件大?。?/td> 1878K
代理商： DEM-ADS7864
Introduction
1-2
1.1
Introduction
The ADS7864 is a high speed, low power, dual 12-bit A/D converter that
operates from a single 5-V supply. The input channels are fully
differential with a typical common-mode rejection of 80 dB. The part
contains dual 2-
μ
s successive approximation ADCs, six differential
sample-and-hold amplifiers, an internal 2.5-V reference with REF
IN
and REF
OUT
pins and a high-speed parallel interface.
There are six analog inputs that are grouped into three channels (A, B
and C). Each A/D converter has three inputs (A0, B0, C0 or A1, B1, C1)
that can be sampled and converted simultaneously. This preserves the
relative phase information of the signals on the analog inputs. Each pair
of channels has a hold signal (HOLDA, HOLDB, and HOLDC) that
when strobed together, allows simultaneous sampling on all 6
channels. The part accepts an analog input voltage in the range of
–
V
REF
to +V
REF
,
centered on the internal 2.5-V reference. The part will
also accept bipolar input ranges when a level shift circuit is used in the
analog front-end circuitry (see Figure 1
–
1).
Conversion time for the ADS7864 is 1.75
μ
s when an 8-MHz external
clock is used. The corresponding acquisition time is 0.25
μ
s. To achieve
maximum output rate (500 kHz), the read function can be performed
during the start of the next conversion.
The evaluation board provides analog input flexibility, permitting
evaluation of the user
’
s own application. The digital interface of the
DEM-ADS7864 provides direct connection to the computer interface
board (CIB), allowing the user to evaluate device performance with the
BBEval
software.
In the factory default configuration, a 5-V analog and 5-V digital supply
are required for proper operation of the DEM-ADS7864 board. The
analog buffer amplifiers are socketed, allowing the user to easily
change input configurations. The input power circuit can be modified
to allow up to
±
15-V analog supply operation.
1.2
Features
Full-featured evaluation board for the ADS7864 500 kHz, 12-Bit,
6-channel simultaneous sampling analog to digital converter
Operates with a single 5-V power supply
—
can be configured for
±
15 V
operation
Accepts wide range of operational amplifiers in different configurations
Direct interface to CIB board
High-speed parallel interface to the PC
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相關(guān)代理商/技術(shù)參數(shù)
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