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| 型號： | AD7864ASZ-2REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 1/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT PAR 520K 4CH 44MQFP |
| 標(biāo)準(zhǔn)包裝： | 800 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 520k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 120mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-QFP |
| 供應(yīng)商設(shè)備封裝： | 44-MQFP（10x10） |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 4 個差分，單極 |
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4-Channel, Simultaneous Sampling,
High Speed, 12-Bit ADC
AD7864
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalog Devices foritsuse,nor for anyinfringements ofpatents orother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
1998–2009 Analog Devices, Inc. All rights reserved.
FEATURES
High speed (1.65 μs) 12-bit ADC
4 simultaneously sampled inputs
4 track-and-hold amplifiers
0.35 μs track-and-hold acquisition time
1.65 μs conversion time per channel
HW/SW select of channel sequence for conversion
Single-supply operation
Selection of input ranges
±10 V, ±5 V for AD7864-1
±2.5 V for AD7864-3 0 V to 2.5 V, 0 V to 5 V for AD7864-2
High speed parallel interface that allows
Interfacing to 3 V processors
Low power, 90 mW typical
Power saving mode, 20 μW typical
Overvoltage protection on analog inputs
APPLICATIONS
AC motor control
Uninterrupted power supplies
Data acquisition systems
Communications
GENERAL DESCRIPTION
The AD7864 is a high speed, low power, 4-channel, simulta-
neous sampling 12-bit analog-to-digital converter (ADC) that
operates from a single 5 V supply. The part contains a 1.65 μs
successive approximation ADC, four track-and-hold amplifiers,
a 2.5 V reference, an on-chip clock oscillator, signal conditioning
circuitry, and a high speed parallel interface. The input signals
on four channels sample simultaneously preserving the relative
phase information of the signals on the four analog inputs. The
part accepts analog input ranges of ±10 V, ±5 V (AD7864-1), 0 V
to +2.5 V, 0 V to +5 V (AD7864-2), and ±2.5 V (AD7864-3).
Any subset of the four channels can be converted to maximize
the throughput rate on the selected sequence. Select the channels to
convert via hardware (channel select input pins) or software (pro-
gramming the channel select register).
A single conversion start signal (CONVST) simultaneously places
all the track-and-holds into hold and initiates a conversion se-
quence for the selected channels. The EOC signal indicates the end
of each individual conversion in the selected conversion sequence.
The BUSY signal indicates the end of the conversion sequence.
FUNCTIONAL BLOCK DIAGRAM
STBY
FRSTDATA
INT/EXT CLOCK
SELECT
OUTPUT
DATA
REGISTERS
2.5V
REFERENCE
SIGNAL
SCALING
VIN1A
VIN1B
VIN2A
VIN2B
VIN3A
VIN3B
VIN4A
VIN4B
BUSY
SIGNAL
SCALING
SIGNAL
SCALING
SIGNAL
SCALING
TRACK-AND-HOLD
×4
EOC
WR
CS
DB0
DB11
RD
AGND
DGND
VDRIVE
DVDD
VREFGND
VREF
AVDD
6k
AD7864
12-BIT
ADC
SOFTWARE
LATCH
CONVERSION
CONTROL LOGIC
MUX
CONVST
SL2
SL1
SL3 SL4 H/S
SEL
CLKIN INT/EXT
CLK
AGND AGND
INT
CLOCK
DB0 TO DB3
01
34
1-
00
1
Figure 1.
Data is read from the part by a 12-bit parallel data bus using the
standard CS and RD signals. Maximum throughput for a single
channel is 500 kSPS. For all four channels, the maximum throughput
is 130 kSPS for the read-during-conversion sequence operation.
The throughput rate for the read-after-conversion sequence
operation depends on the read cycle time of the processor. See
the
section. The AD7864 is available in a
small (0.3 square inch area) 44-lead MQFP.
PRODUCT HIGHLIGHTS
1.
Four track-and-hold amplifiers and a fast (1.65 μs) ADC for
simultaneous sampling and conversion of any subset of the
four channels.
2.
A single 5 V supply consuming only 90 mW typical, makes
it ideal for low power and portable applications. See the
Standby Mode Operation section.
3.
High speed parallel interface for easy connection to micro-
processors, microcontrollers, and digital signal processors.
4.
Available in three versions with different analog input
ranges. The AD7864-1 offers the standard industrial input
ranges of ±10 V and ±5 V; the AD7864-3 offers the common
signal processing input range of ±2.5 V; the AD7864-2 can
be used in unipolar, 0 V to 2.5 V and 0 V to 5 V,
applications.
5.
Features very tight aperture delay matching between the
four input sample-and-hold amplifiers.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7864ASZ-2REEL2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4-Channel, Simultaneous Sampling, High Speed, 12-Bit ADC |
| AD7864ASZ-3 | 功能描述:IC ADC 12BIT PAR 520K 4CH 44MQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個單端，單極；2 個差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7864ASZ-32 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4-Channel, Simultaneous Sampling, High Speed, 12-Bit ADC |
| AD7864ASZ-3REEL | 功能描述:IC ADC 12BIT PAR 520K 4CH 44MQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7864ASZ-3REEL2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4-Channel, Simultaneous Sampling, High Speed, 12-Bit ADC |
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