參數(shù)資料
型號(hào)： AD7864
廠商： Analog Devices, Inc.
英文描述： Four Channel, Simultaneous Sampling, High Speed, 12-Bit ADC(四通道,同時(shí)采樣高速12位A/D轉(zhuǎn)換器)
中文描述： 四通道，同步采樣，高速，12位ADC（四通道，同時(shí)采樣高速12位的A / D轉(zhuǎn)換器）
文件頁(yè)數(shù)： 1/20頁(yè)
文件大?。?/td> 394K
代理商： AD7864
REV. 0
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
AD7864
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., 1998
Four Channel, Simultaneous
Sampling, High Speed, 12-Bit ADC
FUNCTIONAL BLOCK DIAGRAM
STBY
V
IN1A
V
IN1B
FRSTDATA
INT/EXT CLOCK
SELECT
OUTPUT
DATA
REGISTERS
2.5V
REFERENCE
SIGNAL
SCALING
V
IN2A
V
IN2B
V
IN3A
V
IN3B
V
IN4A
V
IN4B
BUSY
EOC
SIGNAL
SCALING
SIGNAL
SCALING
SIGNAL
SCALING
TRAC 4
3
WR
CS
DB0
DB11
RD
AGND
DGND
V
DRIVE
DV
DD
V
REF GND
V
REF
AV
DD
6k
V
AD7864
12-BIT
ADC
SOFTWARE
LATCH
CONVERSION
CONTROL LOGIC
MUX
CONVST
SL1 SL2 SL3 SL4 R/S
SEL
CLKIN
INT
/EXT
CLK
AGND AGND
INT
CLOCK
DB0–DB3
FEATURES
High Speed (1.65
m
s) 12-Bit ADC
Four Simultaneously Sampled Inputs
Four Track/Hold Amplifiers
0.35
m
s Track/Hold Acquisition Time
1.65
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 for AD7864-1
6
2.5 V for AD7864-3
0 V to 2.5 V, 0 V to 5 V for AD7864-2
High Speed Parallel Interface Which Also Allows
Interfacing to 3 V Processors
Low Power, 90 mW typ
Power Saving Mode, 5
m
A typ
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, four-channel simulta-
neous sampling 12-bit A/D converter that operates from a single
+5V supply. The part contains a 1.65
μ
s successive approxima-
tion 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 simultaneously thus preserving the relative phase infor-
mation of the signals on the four analog inputs. The part accepts
analog input ranges of
±
10V,
±
5 V (AD7864-1), 0 V to 2.5 V,
0 V to 5 V for AD7864-2 and
±
2.5V (AD7864-3). Overvoltage
protection on the analog inputs for the part allows the input
voltage to go to
±
20 V, +20 V/–1 V and +20 V/–5 V respectively
without damaging the parts or affecting a conversion in progress.
The part allows any subset of the four channels to be converted
in order to maximize the throughput rate on the selected sequence.
The channels to be converted can be selected via either hard-
ware (channel select input pins) or software (programming the
channel select register).
A single conversion start signal (
CONVST
) simultaneously
places all the track/holds into hold and initiates 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.
Data is read from the part by means of a 12-bit parallel data
bus using the standard
CS
and
RD
signals. Maximum through-
put for a single channel is 500 kSPS. For all four channels the
maximum throughput is 130 kSPS for the read during conver-
sion sequence operation. The throughput rate for the read after
conversion sequence operation will depend on the read cycle
time of the processor. See Timing and Control section.
The AD7864 is available in a small (0.3 sq. inch area) 44-lead
PQFP.
PRODUCT HIGHLIGHTS
1. The AD7864 features four Track/Hold amplifiers and a fast
(1.65
μ
s) ADC allowing simultaneous sampling and then
conversion of any subset of the four channels.
2. The AD7864 operates from a single +5V supply and consumes
only 90 mW typ making it ideal for low power and portable
applications. Also see Standby Mode Operation.
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 two 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, 0 V to 5 V applications.
5. The part features very tight aperture delay matching between
the four input sample-and-hold amplifiers.
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