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參數資料
| 型號： | AD7865AS-2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | Four-Channel, Simultaneous Sampling, Fast, 14-Bit ADC |
| 中文描述： | 4-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數： | 1/19頁 |
| 文件大小： | 195K |
| 代理商： | AD7865AS-2 |
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
AD7865
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 1999
REV. A
Four-Channel, Simultaneous
Sampling, Fast, 14-Bit ADC
FEATURES
Fast (2.4
m
s) 14-Bit ADC
Four Simultaneously Sampled Inputs
Four Track/Hold Amplifiers
0.35
m
s Track/Hold Acquisition Time
2.4
m
s Conversion Time per Channel
HW/SW Select of Channel Sequence for Conversion
Single Supply Operation
Selection of Input Ranges:
6
10 V,
6
5 V and
6
2.5 V,
0 V to +5 V and 0 V to +2.5 V
High Speed Parallel Interface Which Also Allows
Interfacing to 3 V Processors
Low Power, 115 mW Typ
Power Saving Mode, 15
m
W Typ
Overvoltage Protection on Analog Inputs
APPLICATIONS
AC Motor Control
Uninterruptible Power Supplies
Industrial Power Meters/Monitors
Data Acquisition Systems
Communications
GENERAL DESCRIPTION
The AD7865 is a fast, low power, four-channel simultaneous
sampling 14-bit A/D converter that operates from a single +5V
supply. The part contains a 2.4
μ
s successive approximation
ADC, four track/hold amplifiers, 2.5 V reference, on-chip clock
oscillator, signal conditioning circuitry and a high speed parallel
interface. The input signals on four channels are sampled simul-
taneously thus preserving the relative phase information of the
signals on the four analog inputs. The part accepts analog input
ranges of
±
10V,
±
5 V,
±
2.5 V, 0 V to +2.5 V and 0 V to +5 V.
The part allows any subset of the four channels to be converted
in order to maximize the throughput rate on the selected se-
quence. The channels to be converted can be selected either via
hardware (channel select input pins) or via software (program-
ming the channel select register).
A single conversion start signal (
CONVST
) simultaneously places
all the track/holds into hold and initiates conversion sequence
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.
Data is read from the part via a 14-bit parallel data bus using the
standard
CS
and
RD
signals. Maximum throughput for a single
channel is 350 kSPS. For all four channels the maximum through-
put is 100 kSPS.
The AD7865 is available in a small (0.3 sq. inch area) 44-lead
PQFP.
PRODUCT HIGHLIGHTS
1. The AD7865 features four Track/Hold amplifiers and a fast
(2.4
μ
s) ADC allowing simultaneous sampling and then
conversion of any subset of the four channels.
2. The AD7865 operates from a single +5V supply and con-
sumes only 115 mW typ, making it ideal for low power and
portable applications.
3. The part offers a high speed parallel interface for easy con-
nection to microprocessors, microcontrollers and digital
signal processors.
4. The part is offered in three versions with different analog
input ranges. The AD7865-1 offers the standard industrial
ranges of
±
10 V and
±
5 V; the AD7865-2 offers a unipolar
range of 0 V to +2.5 V or 0 V to +5 V and the AD7865-3
offers the common signal processing input range of
±
2.5 V.
5. The part features very tight aperture delay matching between
the four input sample and hold amplifiers.
FUNCTIONAL BLOCK DIAGRAM
SIGNAL
SCALING
SIGNAL
SCALING
SIGNAL
SCALING
SIGNAL
SCALING
FRSTDATA
AGND
CHANNEL
SELECT
REGISTER
MUX
DB0–DB3
+2.5V
REFERENCE
TRACK/HOLD
3
4
6k
V
AD7865
EOC
V
DRIVE
RD
CLK IN
/SL1
INT
/EXT
CLK/SL2
SL3 SL4
H
/S
SEL
DGND
AV
DD
V
REF
AGND
CONVST
BUSY
DB13
DV
DD
V
IN4A
V
IN4B
V
IN3B
V
IN3A
V
IN2B
V
IN1B
STBY
V
REFAGND
AGND
V
IN1A
V
IN2A
14-BIT
ADC
CONVERSION
CONTROL LOGIC
INT
CLOCK
INT/EXT
CLOCK
SELECT
OUTPUT
LATCH
WR
CS
DB0
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| AD7865AS-3 | Four-Channel, Simultaneous Sampling, Fast, 14-Bit ADC |
| AD7865BS-1 | Four-Channel, Simultaneous Sampling, Fast, 14-Bit ADC |
| AD7865BS-2 | Four-Channel, Simultaneous Sampling, Fast, 14-Bit ADC |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7865AS-2REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 350ksps 14-bit Parallel 44-Pin MQFP T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 350KSPS 14BIT PARALLEL 44MQFP - Tape and Reel |
| AD7865AS-3 | 制造商:Analog Devices 功能描述:ADC Single SAR 350ksps 14-bit Parallel 44-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:4 CH. SIMULTANEOUS BIPOLAR,14-B ADC I.C. - Bulk 制造商:Analog Devices 功能描述:IC 14-BIT ADC |
| AD7865AS-3REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 350ksps 14-bit Parallel 44-Pin MQFP T/R |
| AD7865ASZ | 制造商:AD 制造商全稱:Analog Devices 功能描述:Four-Channel, Simultaneous Sampling, Fast, 14-Bit ADC |
| AD7865ASZ-1 | 功能描述:IC ADC 14BIT DUAL 4CH 44-MQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:microPOWER™ 位數:8 采樣率（每秒）:1M 數據接口:串行，SPI? 轉換器數目:1 功率耗散（最大）:- 電壓電源:模擬和數字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數目和類型:8 個單端，單極 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
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