AD7714ANZ5 Analog Devices, AD7714ANZ5 Datasheet
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AD7714ANZ5
Manufacturer Part Number
AD7714ANZ5
Description
DIP24
Manufacturer
Analog Devices
Datasheet
1.AD7714ARSZ5.pdf
(40 pages)
Specifications of AD7714ANZ5
Date_code
09+
a
GENERAL DESCRIPTION†
The AD7714 is a complete analog front end for low-frequency
measurement applications. The device accepts low level signals
directly from a transducer and outputs a serial digital word. It
employs a sigma-delta conversion technique to realize up to 24
bits of no missing codes performance. The input signal is applied
to a proprietary programmable gain front end based around an
analog modulator. The modulator output is processed by an on-
chip digital filter. The first notch of this digital filter can be
programmed via the on-chip control register allowing adjust-
ment of the filter cutoff and settling time.
The part features three differential analog inputs (which can also
be configured as five pseudo-differential analog inputs) as well as a
differential reference input. It operates from a single supply (+3 V
or +5 V). The AD7714 thus performs all signal conditioning and
conversion for a system consisting of up to five channels.
The AD7714 is ideal for use in smart, microcontroller- or DSP-
based systems. It features a serial interface that can be configured
*Protected by U.S. Patent No. 5,134,401.
†See page 39 for data sheet index.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corporation.
REV. C
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
Charge Balancing ADC
Five-Channel Programmable Gain Front End
Three-Wire Serial Interface
3 V (AD7714-3) or 5 V (AD7714-5) Operation
Low Noise (<150 nV rms)
Low Current (350
AD7714Y Grade:
Low-Pass Filter with Programmable Filter Cutoffs
Ability to Read/Write Calibration Coefficients
APPLICATIONS
Portable Industrial Instruments
Portable Weigh Scales
Loop-Powered Systems
Pressure Transducers
24 Bits No Missing Codes
0.0015% Nonlinearity
Gains from 1 to 128
Can Be Configured as Three Fully Differential
Inputs or Five Pseudo-Differential Inputs
SPI™, QSPI™, MICROWIRE™ and DSP Compatible
+2.7 V to 3.3 V or +4.75 V to +5.25 V Operation
0.0010% Linearity Error
–40 C to +105 C Temperature Range
Schmitt Trigger on SCLK and DIN
Low Current (226 A typ) with Power-Down (4 A typ)
Lower Power Dissipation than Standard AD7714
Available in 24-Lead TSSOP Package
A typ) with Power-Down (5 A typ)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
for three-wire operation. Gain settings, signal polarity and channel
selection can be configured in software using the serial port. The
AD7714 provides self-calibration, system calibration and back-
ground calibration options and also allows the user to read and
write the on-chip calibration registers.
CMOS construction ensures very low power dissipation, and the
power-down mode reduces the standby power consumption to
15 W typ. The part is available in a 24-pin, 0.3 inch-wide, plastic
dual-in-line package (DIP); a 24-lead small outline (SOIC)
package, a 28-lead shrink small outline package (SSOP) and a
24-lead thin shrink small outline package (TSSOP).
PRODUCT HIGHLIGHTS
1. The AD7714Y offers the following features in addition to the
2. The AD7714 consumes less than 500 A (f
3. The programmable gain channels allow the AD7714 to ac-
4. The AD7714 is ideal for microcontroller or DSP processor
5. The part features excellent static performance specifications
MCLK OUT
MCLK IN
standard AD7714: wider temperature range, Schmitt trigger
on SCLK and DIN, operation down to 2.7 V, lower power
consumption, better linearity, and availability in 24-lead
TSSOP package.
or 1 mA (f
it ideal for use in loop-powered systems.
cept input signals directly from a strain gage or transducer
removing a considerable amount of signal conditioning.
applications with a three-wire serial interface reducing the num-
ber of interconnect lines and reducing the number of opto-
couplers required in isolated systems. The part contains
on-chip registers that allow control over filter cutoff, input gain,
channel selection, signal polarity and calibration modes.
with 24-bit no missing codes, 0.0015% accuracy and low
rms noise (140 nV). Endpoint errors and the effects of tem-
perature drift are eliminated by on-chip self-calibration,
which removes zero-scale and full-scale errors.
BUFFER
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AGND
AV
AV
AGND
FUNCTIONAL BLOCK DIAGRAM
CLK IN
DD
GENERATION
DD
Signal Conditioning ADC
AD7714
1 A
1 A
CLOCK
DV
3 V/5 V, CMOS, 500 A
= 2.5 MHz) in total supply current, making
DD
World Wide Web Site: http://www.analog.com
BUFFER
DGND
REF IN(–)
A = 1–128
PGA
REF IN(+)
POL
SERIAL INTERFACE
REGISTER BANK
© Analog Devices, Inc., 1998
A/D CONVERTER
DIGITAL FILTER
DRDY
MODULATOR
BALANCING
CHARGE
AD7714*
-
RESET
CLK IN
= 1 MHz)
STANDBY
SYNC
SCLK
CS
DIN
DOUT