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| 型號(hào)： | AD7865 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Simultaneous Sampling, Fast, 14-Bit ADC(四通道,同時(shí)采樣,高速,14位A/D轉(zhuǎn)換器) |
| 中文描述： | 同步采樣，快速，14位ADC（四通道，同時(shí)采樣，高速，14位的A / D轉(zhuǎn)換器） |
| 文件頁數(shù)： | 1/21頁 |
| 文件大?。?/td> | 375K |
| 代理商： | AD7865 |
DATA
The part allows any subset of the 4 channels to be con-
verted in order to maximize the throughput rate on the
selected sequence. The channels to be converted can be
selected either via hardware (channel select input pins) or
via software (programming the channel select register).
A single conversion start signal (
CONVST
) places all the
track/holds into hold simultaneously and initiates conver-
sion 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.
TECHNCAL
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
FUNCTIONAL BLOCK DIAGRAM
Rev. PrC
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
Preliminary Technical Data
Four Channel, Simultaneous
Sampling, Fast, 14-Bit ADC
AD7865
FEATURES
Fast (2.5 μs) 14-Bit ADC
Four Simultaneously Sampled Inputs
Four Track/Hold Amplifiers
0.35 μs Track/Hold Acquisition Time
2.5 μs Conversion Time per Channel
HW/SW Select of Channel Sequence for conversion
Single Supply Operation
Selection of Input Ranges: ±10 V, ±5 V and ±2.5 V
High Speed Parallel Interface
which also allows Interfacing to 3V processors
Low Power, 100mW typ
Power Saving Mode, 5 μA 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 simulta-
neous sampling 14-bit A/D converter that operates from a
single +5 V supply. The part contains a 2.5μs successive
approximation ADC, four track/hold amplifiers, 2.5V
reference, on chip clock oscillator, signal conditioning
circuitry and a high speed parallel interface. The input
signals on four channels are sampled simultaneously thus
preserving the relative phase information of the signals on
the four analog inputs. The part accepts analog input
ranges of ±10 V , ±5V or ±2.5V. Overvoltage protection
on the analog inputs for the part allows the input voltage
to go to ±20 V without damaging the parts or affecting a
conversion in progress.
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 throughput is 100 ksps.
The AD7865 is available in a small (0.3 sq.inch area) 44-
pin PQFP.
1. The AD7865 features four Track/Hold amplifiers and a
fast (2.5μs) ADC allowing simultaneous sampling and
then conversion of any subset of the four channels.
2. The AD7865 operates from a single +5 V supply and
consumes only 100 mW typ making it ideal for low
power and portable applications.
3. The part offers a high speed parallel interface for easy
connection to microprocessors, microcontrollers and
digital signal processors.
4. The part is offered in two versions with different analog
input ranges. The AD7865-1 offers the standard
industrial ranges of ±10V and ±5V; the AD7865-3
offers the common signal processing input range of
±2.5V.
5. The part features very tight aperture delay matching
between the four input sample & hold amplifiers.
INT/EXT CLOCK
SELECT
14-BIT
ADC
TRACK/HOLD
X 4
AGND
DB0
RD
CS
CONVST
CONVERSION
CONTROL LOGIC
V
SIGNAL
SCALING
SIGNAL
SCALING
IN2A
VIN1B
AGND
AVDD
DB13
OUTPUT
LATCH
V
SIGNAL
SCALING
SIGNAL
SCALING
IN4A
VIN3A
AD7865
+2.5V
REFERENCE
6K
W
VIN1A
VIN2B
VIN3B
IN4B
V
VREF GND
SL3
SL4
CLKIN
/SL1
M
U
X
VREF
+
_
WR
INT CLOCK
BUSY
EOC
H/S SEL
STBY
DGND
AGND
DVDD
FRSTDATA
CHANNEL
SELECT
REGISTER
DB0 - DB3
VDRIVER
INT
/EXT CLK
/SL2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7865AS-1 | 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:Analog-Digital Converter IC Number of Bi |
| AD7865AS-1REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 350ksps 14-bit Parallel 44-Pin MQFP T/R 制造商:Rochester Electronics LLC 功能描述:4 CH. SIMULTANEOUS BIPOLAR,14-B ADC I.C. - Tape and Reel |
| AD7865AS2 | 制造商:AD 功能描述:* |
| AD7865AS-2 | 制造商:Analog Devices 功能描述:ADC Single SAR 350ksps 14-bit Parallel 44-Pin MQFP 制造商:Analog Devices 功能描述:IC 14-BIT ADC |
| 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 |
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