AD7861AP Analog Devices Inc, AD7861AP Datasheet

IC ADC 11BIT 4CH 44-PLCC

AD7861AP

Manufacturer Part Number
AD7861AP
Description
IC ADC 11BIT 4CH 44-PLCC
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD7861AP

Rohs Status
RoHS non-compliant
Number Of Bits
11
Sampling Rate (per Second)
28.6k
Data Interface
Parallel
Number Of Converters
1
Power Dissipation (max)
50mW
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
44-PLCC

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REV. B
a
GENERAL DESCRIPTION
The AD7861 is a multichannel simultaneous sampling A/D
Converter (ADC) configured for the acquisition of voltage
inputs in a motor control solution or three-phase power system.
The AD7861 combined with Analog Devices’ 16-bit fixed-
point digital signal processor (DSP) provides a low cost 16-bit
fixed-point microcontroller solution.
The input stage has been designed to accommodate the types of
signals frequently found in motor drives. The VIN1, VIN2, and
VIN3 channels are simultaneously sampled inputs suitable for
stator current acquisition. The AUX0–AUX3 channels are
multiplexed and are suitable for slower moving inputs such as
temperature and bus voltage of the diode rectifier output in a
motor control application.
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.
FEATURES
11-Bit Resolution Analog-to-Digital Converter
Seven Single-Ended Analog Inputs
Internal 2.5 V Reference
3.2
User Definable Channel Sequencing
Single Supply +5 V Operation
Double Buffered Register Outputs
6.25 MHz to 12.5 MHz Operating Clock Range
APPLICATIONS
Motor Control
3-Phase Power Measurement
Cellular Phones
Data Acquisition
Four Input Channels Simultaneously Sampled
Expansion with 4 Multiplexed Inputs
s Conversion Time per Channel
Simultaneous Sampling A/D Converter
PRODUCT HIGHLIGHTS
Simultaneous Sampling of Four Inputs
Four channel sample and hold amplifier (SHA) allows out of
phase input signals to be sampled simultaneously, preserving
the relative phase information. Sample-and-hold acquisition
time is 1.6 µs and conversion time per channel is 3.2 µs (using
a 12.5 MHz system clock).
Flexible Analog Channel Sequencing
AD7861 supports acquisition of 2, 3 or 4 channels per group.
Converted channel results are stored in registers and the data
can be read in any order. The sampling and conversion time
for two channels is 8 µs, three channels is 11.2 µs, and four
channels is 14.4 µs (using a 12.5 MHz system clock).
Single 5 V dc Operation
Low power, digital process.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
REF OUT
AUX0
AUX1
AUX2
AUX3
VIN2
VIN1
VIN3
S0
S1
REFERENCE
MUX
FUNCTIONAL BLOCK DIAGRAM
4-1
SHA
2.5V
CONVST RESET
World Wide Web Site: http://www.analog.com
REF IN
11-BIT
ADC
11-Bit Resolution
BUSY
M 0 M1
© Analog Devices, Inc., 2000
12
AD7861
REGISTERS
AD7861
OUTPUT
A0
A1
D0
D11
RD
CS
CLKIN
SGND
AGND
DGND
V
DD

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AD7861AP Summary of contents

Page 1

FEATURES 11-Bit Resolution Analog-to-Digital Converter Seven Single-Ended Analog Inputs Four Input Channels Simultaneously Sampled Expansion with 4 Multiplexed Inputs Internal 2.5 V Reference 3.2 s Conversion Time per Channel User Definable Channel Sequencing Single Supply +5 V Operation Double ...

Page 2

... Input Current Input Capacitance SYSTEM CLOCK POWER REQUIREMENTS 5 – +85 C; REFIN = 2.5 V; Ext CLK @ 12.5 MHz, unless DD A otherwise noted) AD7861AP Units Conditions/Comments 11 Bits Twos Complement Data Format ± 2 LSB max Integral Nonlinearity ± 2.5 LSB max ± 9 LSB max Any Channel 4 ...

Page 3

... This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Model AD7861AP –3– AD7861 = +5 V unless otherwise noted) DD ...

Page 4

AD7861 PIN DESCRIPTION Pin Mnemonic Type Description 1 AUX0 I/P Auxiliary Input 0 2 REFIN I/P Analog Reference Input 3 AGND GND Analog Ground 4 REFOUT O/P Internal 2.5 Analog Reference 5 S0 I/P Aux Channel Select ...

Page 5

ANALOG INPUT BLOCK The AD7861 is an 11-bit resolution, successive approximation analog-to-digital (A/D) converter with twos complement output data format. The analog input range is 0 V–5 V with a 2.5 V reference as defined by the reference input pin ...

Page 6

AD7861 DESCRIPTION OF THE REGISTERS VIN1, VIN2, VIN3 These registers contain the results from the conversion of the analog input voltages. AUX In the AD7861, this register contains the conversion result of the auxiliary channel which had been selected by ...

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