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PDF AD7782 Data sheet ( Hoja de datos )
| Número de pieza | AD7782 | |
| Descripción | Read Only/ Pin Configured 24-Bit ADC | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
2-Channel, 24-Bit ⌺-⌬ ADC
Pin Configurable (No Programmable Registers)
Pin Selectable Input Channels
Pin Programmable Input Ranges (؎2.56 V or ؎160 mV)
Fixed 19.79 Hz Update Rate
Simultaneous 50 Hz and 60 Hz Rejection
24-Bit No Missing Codes
18.5-Bit p-p Resolution (؎2.56 V Range)
16.5-Bit p-p Resolution (؎160 mV Range)
INTERFACE
Master or Slave Mode of Operation
Slave Mode
3-Wire Serial
SPI™, QSPI™, MICROWIRE™, and DSP-Compatible
Schmitt Trigger on SCLK
POWER
Specified for Single 3 V and 5 V Operation
Normal: 1.3 mA @ 3 V
Power-Down: 9 A
ON-CHIP FUNCTIONS
Rail-Rail Input Buffer and PGA
APPLICATIONS
Sensor Measurement
Industrial Process Control
Temperature Measurement
Pressure Measurements
Weigh Scales
Portable Instrumentation
Read Only, Pin Configured
24-Bit ⌺-⌬ ADC
AD7782
FUNCTIONAL BLOCK DIAGRAM
VDD
GND
REFIN(+) REFIN(–) XTAL1 XTAL2
AD7782
OSCILLATOR
AND
PLL
AIN1(+)
AIN1(–)
AIN2(+)
AIN2(–)
MUX
BUF
PGA
24-BIT ⌺-⌬
ADC
SERIAL
INTERFACE
AND
CONTROL
LOGIC
DOUT/RDY
SCLK
MODE
CS
CH1/CH2
RANGE
BASIC CONNECTION DIAGRAM
ANALOG
INPUT
ANALOG
INPUT
REFERENCE
INPUT
POWER SUPPLY
VDD
AD7782
AIN1(+)
AIN1(–)
AIN2(+)
AIN2(–)
REFIN(+)
REFIN(–)
CS
DOUT/RDY
SCLK
XTAL1
XTAL2
GND
DIGITAL
INTERFACE
32.768kHz
CRYSTAL
GENERAL DESCRIPTION
The AD7782 is a complete analog front end for low-frequency
measurement applications. The 24-bit sigma-delta ADC contains
two fully differential analog input channels that can be config-
ured with a gain of 1 or 16 allowing full-scale input signal ranges
of ± 2.56 V or ± 160 mV from a +2.5 V differential reference
input.
The AD7782 has an extremely simple, read-only digital interface
which can be operated in master mode or slave mode. There are
no on-chip registers to be programmed. The input signal range
and input channel selection are configured using two external pins.
The device operates from a 32.768 kHz crystal with an on-chip PLL
generating the required internal operating frequency. The output
data rate from the part is fixed via the master clock at 19.79 Hz and
provides simultaneous 50 Hz and 60 Hz rejection at this update
rate. Eighteen-bit p-p resolution can be obtained at this update rate.
The part operates from a single 3 V or 5 V supply. When operating
from 3 V supplies, the power dissipation for the part is 3.9 mW.
The AD7782 is available in a 16-lead TSSOP package.
Another part in the AD778x family is the AD7783. It is similar
to the AD7782 except it has two integrated current sources and
only one differential input channel.
SPI and QSPI are trademarks of Motorola Inc.
MICROWIRE is a trademark of National Semiconductor Corporation.
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
1 page  
AD7782
CH1/CH2 (I)
t2
CS (I)
DOUT/RDY
t3
t4
MSB
LSB
MSB
SLAVE MODE
SCLK (I)
MASTER MODE
SCLK (O)
t5
t5
t11
t7
t6
t7
t6
t10
I = INPUT TO AD7782, O = OUTPUT FROM AD7782
SLAVE MODE IS SELECTED BY TYING THE MODE PIN LOW, WHILE MASTER MODE IS SELECTED BY TYING THE MODE PIN HIGH.
Figure 2. Slave/Master Mode Timing Diagram
t9
LSB
t8
ABSOLUTE MAXIMUM RATINGS*
(TA = 25°C unless otherwise noted)
VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
Analog Input Voltage to GND . . . . . . . . –0.3 V to VDD + 0.3 V
Reference Input Voltage to GND . . . . . –0.3 V to VDD + 0.3 V
Total AIN/REFIN Current (Indefinite) . . . . . . . . . . . . . 30 mA
Digital Input Voltage to GND . . . . . . . . –0.3 V to VDD + 0.3 V
Digital Output Voltage to GND . . . . . . –0.3 V to VDD + 0.3 V
Operating Temperature Range . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C
TSSOP Package
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . .97.9°C/W
θJC Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . 14°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
*Stresses above those listed under Absolute Maximum Ratings may cause per-
manent damage to the device. This is a stress rating only; functional operation of
the device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
Model
AD7782BRU
EVAL-AD7782EB
ORDERING GUIDE
Temperature Range
–40°C to +85°C
Package Description
TSSOP
Evaluation Board
Package Option
RU-16
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the AD7782 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. 0
–5–
5 Page 
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AD7782.PDF ] | |
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