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Data Sheet

FULL DATA SHEET (PDF, 544kB) Download   E-Mail

Description

The MX7705 low-power, 2-channel, serial-output analog-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 features an on-chip input buffer and programmable-gain amplifier (PGA). The device offers an SPI™-/QSPI™-/MICROWIRE™-compatible serial interface. The MX7705 operates from a single 2.7V to 5.25V supply. The operating supply current is 320µA (typ) with a 3V supply. Power-down mode reduces the supply current to 2µA (typ). Self-calibration and system calibration allow the MX7705 to correct for gain and offset errors. Excellent DC performance (±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 differential 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 output 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 signals to be directly acquired with little or no signal-conditioning requirements. The MX7705 is available in 16-pin PDIP, SO, and TSSOP packages.

Key Features		Applications/Uses
Pin Compatible and Software Compatible with the AD7705 16-Bit Sigma-Delta ADC Two Fully Differential Input Channels 0.003% Integral Nonlinearity with No Missing Codes Interface with Schmitt Triggers on Inputs Internal Analog Input Buffers PGA from 1 to 128 Single (2.7V to 3.6V) or (4.75V to 5.25V) Supply Low Power 1mW (max), 3V Supply 2µA (typ) Power-Down Current SPI-/QSPI-/MICROWIRE-Compatible 3-Wire Serial Interface 16-Pin PDIP, SO, and TSSOP Packages		Flow and Gas Meters Industrial Instruments Loop-Powered Systems Medical Instrumentation Pressure Transducers RTD Measurements Strain-Gauge Measurements Thermocouple Measurements Weigh Scales

Application Notes

Application Note 3418: Understanding the Effects of Clock Tolerances on 50/60Hz Noise Rejection in High Performance Sigma Delta ADCs - MX7705 Application Note 4026: Implementing Cold-Junction Compensation in Thermocouple Applications - MX7705

Evaluation Kits

none

Design Guides

A/D Converters (PDF)

Reliability Reports

Show FIT data for: MX7705 Request Reliability Report for: MX7705

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-10 of 10
MX7705	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MX7705EPE			PDIP(N);16 pin;158 mm² Outline Drawing: 21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MX7705EPE+			PDIP(N);16 pin;158 mm² Outline Drawing: 21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MX7705EWE			SOIC(W);16 pin;112 mm² Outline Drawing: 21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MX7705EWE-T			SOIC(W);16 pin;112 mm² Outline Drawing: 21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MX7705EWE+			SOIC(W);16 pin;112 mm² Outline Drawing: 21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MX7705EWE+T			SOIC(W);16 pin;112 mm² Outline Drawing: 21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MX7705EUE			TSSOP;16 pin;33 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0117 (PDF) Use pkgcode/variation: U16-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MX7705EUE-T			TSSOP;16 pin;33 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0117 (PDF) Use pkgcode/variation: U16-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MX7705EUE+			TSSOP;16 pin;33 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0117 (PDF) Use pkgcode/variation: U16+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MX7705EUE+T			TSSOP;16 pin;33 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0117 (PDF) Use pkgcode/variation: U16+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2003-11-21

Related Products

MAX1415, MAX1416 16-Bit, Low-Power, 2-Channel, Sigma-Delta ADCs

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