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AD7718BRU 数据表(PDF) 2 Page - Analog Devices

部件名 AD7718BRU
功能描述  8-/10-Channel, Low Voltage, Low Power, ADCs
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD7718BRU 数据表(HTML) 2 Page - Analog Devices

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REV. 0
–2–
AD7708/AD7718
FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
FUNCTIONAL BLOCK DIAGRAM . . . . . . . . . . . . . . . . . 1
GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 1
AD7718 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . 3
AD7708 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . 6
TIMING CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . 9
ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . 10
ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . . . . 12
PIN CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . 13
ADC CIRCUIT INFORMATION . . . . . . . . . . . . . . . . . . . 15
Signal Chain Overview (CHOP Enabled, CHOP = 0) . . . 15
ADC NOISE PERFORMANCE CHOP ENABLED
(
CHOP = 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Signal Chain Overview (CHOP Disabled CHOP = 1) . . . 19
ADC NOISE PERFORMANCE CHOP DISABLED
(
CHOP = 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
ON-CHIP REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Communications Register . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Mode Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Operating Characteristics when Addressing the
Mode and Control Registers . . . . . . . . . . . . . . . . . . . . . . . 28
ADC Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Filter Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
I/O Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
ADC Data Result Register . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Unipolar Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Bipolar Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
ADC Offset Calibration Coefficient Registers . . . . . . . . . . . 31
ADC Gain Calibration Coefficient Register . . . . . . . . . . . . . 31
ID Register (ID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
User Nonprogrammable Test Registers . . . . . . . . . . . . . . . . 31
Configuring the AD7708/AD7718 . . . . . . . . . . . . . . . . . . . . 32
DIGITAL INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
MICROCOMPUTER/MICROPROCESSOR
INTERFACING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
AD7708/AD7718 to 68HC11 Interface . . . . . . . . . . . . . . . . 34
AD7708/AD7718-to-8051 Interface . . . . . . . . . . . . . . . . . . 35
AD7708/AD7718-to-ADSP-2103/ADSP-2105 Interface . . . 36
BASIC CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . 36
Analog Input Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Single-Ended Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Chop Mode of Operation (CHOP = 0) . . . . . . . . . . . . . . . . 37
Nonchop Mode of Operation (CHOP = 1) . . . . . . . . . . . . . 38
Programmable Gain Amplifier . . . . . . . . . . . . . . . . . . . . . . . 38
Bipolar/Unipolar Configuration . . . . . . . . . . . . . . . . . . . . . . 38
Data Output Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Oscillator Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Reference Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
RESET Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Power-Down Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Grounding and Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Data Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Programmable Logic Controllers . . . . . . . . . . . . . . . . . . . . . 41
Converting Single-Ended Inputs. . . . . . . . . . . . . . . . . . . . . 42
Combined Ratiometric and Absolute Value
Measurement System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Optimizing Throughput while Maximizing 50 Hz
and 60 Hz Rejection in a Multiplexed Data
Acquisition System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . 44
TABLE OF CONTENTS


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