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MX7705EWE Datasheet

  • MX7705EWE

  • 16-Bit, Low-Power, 2-Channel, Sigma-Delta ADC

  • 662.29KB

  • 34頁

  • MAXIM   MAXIM

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19-3051; Rev 0; 10/03
16-Bit, Low-Power, 2-Channel,
Sigma-Delta ADC
General Description
The MX7705 low-power, 2-channel, serial-output ana-
log-to-digital converter (ADC) includes a sigma-delta
modulator with a digital filter to achieve 16-bit resolution
with no missing codes. This ADC is pin compatible and
software compatible with the AD7705. The MX7705 fea-
tures an on-chip input buffer and programmable-gain
amplifier (PGA). The device offers an SPI錚?/QSPI錚?/
MICROWIRE錚?compatible serial interface.
The MX7705 operates from a single 2.7V to 5.25V supply.
The operating supply current is 320碌A(chǔ) (typ) with a 3V
supply. Power-down mode reduces the supply current to
2碌A(chǔ) (typ).
Self-calibration and system calibration allow the MX7705
to correct for gain and offset errors. Excellent DC perfor-
mance (鹵0.003% FSR INL) and low noise (650nV) make
the MX7705 ideal for measuring low-frequency signals
with a wide dynamic range. The device accepts fully dif-
ferential bipolar/unipolar inputs. An internal input buffer
allows for input signals with high source impedances. An
on-chip digital filter, with a programmable cutoff and out-
put data rate, processes the output of the sigma-delta
modulator. The first notch frequency of the digital filter is
chosen to provide 150dB rejection of common-mode
50Hz or 60Hz noise and 98dB rejection of normal-mode
50Hz or 60Hz noise. A PGA and digital filtering allow sig-
nals to be directly acquired with little or no signal-condi-
tioning requirements.
The MX7705 is available in 16-pin PDIP, SO, and
TSSOP packages.
Features
o
Pin Compatible and Software Compatible with the
AD7705
o
16-Bit Sigma-Delta ADC
o
Two Fully Differential Input Channels
o
0.003% Integral Nonlinearity with No Missing Codes
o
Interface with Schmitt Triggers on Inputs
o
Internal Analog Input Buffers
o
PGA from 1 to 128
o
Single (2.7V to 3.6V) or (4.75V to 5.25V) Supply
o
Low Power
1mW (max), 3V Supply
2碌A(chǔ) (typ) Power-Down Current
o
SPI-/QSPI-/MICROWIRE-Compatible 3-Wire Serial
Interface
o
16-Pin PDIP, SO, and TSSOP Packages
MX7705
Ordering Information
PART
MX7705EPE*
MX7705EWE*
MX7705EUE
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
PIN-PACKAGE
16 PDIP
16 WIDE SO
16 TSSOP
Applications
Industrial Instruments
Weigh Scales
Strain-Gauge Measurements
Loop-Powered Systems
Flow and Gas Meters
Medical Instrumentation
Pressure Transducers
Thermocouple Measurements
RTD Measurements
*Future
product鈥攃ontact factory for availability.
Pin Configuration
TOP VIEW
SCLK 1
CLKIN 2
CLKOUT 3
CS 4
RESET 5
AIN2+ 6
AIN1+ 7
AIN1- 8
16 GND
15 V
DD
14 DIN
MX7705
13 DOUT
12 DRDY
11 AIN2-
10 REF-
9
REF+
PDIP/SO/TSSOP
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

MX7705EWE 產(chǎn)品屬性

  • Maxim Integrated Products

  • 1

  • 2

  • Delta-Sigma

  • 500 SPs

  • 16 bit

  • Voltage

  • 3-Wire, Microwire, QSPI, Serial, SPI

  • No

  • External

  • 5.25 V

  • 2.7 V

  • 762 mW

  • + 85 C

  • SMD/SMT

  • SOIC-16 Wide

  • - 40 C

  • 3 V, 5 V

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