My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MX7705EWE+
- Part No.:
- MX7705EWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MX7705EWE+.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,003
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MX7705EWE+ from Maxim Integrated is a 16-bit, low-power, 2-channel sigma-delta analog-to-digital converter with on-chip PGA (gain 1–128), internal input buffer, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It delivers ±0.003% FSR INL, 650nV RMS noise (typ), and 150dB common-mode 50/60Hz rejection - ideal for precision weigh scales and strain-gauge measurements in loop-powered industrial systems.
For engineers reviewing the MX7705EWE+ datasheet, MX7705EWE+ pinout, MX7705EWE+ application, or MX7705EWE+ equivalent, key selection considerations include its dual fully differential input channels, software- and pin-compatibility with AD7705, programmable digital filter notch (20–500Hz), single-supply operation (2.7V–5.25V), and 2µA typ power-down current.
Technical Context
The MX7705EWE+ employs a second-order sigma-delta modulator paired with a programmable digital filter that sets output data rate and first-notch frequency (20Hz–500Hz) to suppress 50/60Hz interference. Its internal PGA and analog input buffer enable direct interfacing with high-impedance transducers like load cells and RTDs without external signal conditioning.
Calibration is supported via self-calibration and system calibration modes, correcting gain and offset errors across temperature and supply voltage. The device operates in buffered or unbuffered mode, with input common-mode rejection up to 130dB and normal-mode 50/60Hz rejection at 98dB - all configurable via register writes over its 3-wire serial interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage for precision measurement systems. |
| INL | ±0.003% FSR - enables accurate DC measurement of low-frequency signals such as pressure or temperature transducer outputs. |
| RMS Noise | 650nV (typ, VDD=3V, gain=128, ODR=60Hz) - supports >15-bit effective resolution in low-noise industrial sensing applications. |
| Power Consumption | 320µA typ at 3V (active), 2µA typ in power-down - suitable for battery-operated or energy-constrained loop-powered devices. |
| Supply Range | 2.7V to 5.25V single supply - allows direct integration into 3.3V or 5V industrial control and instrumentation rails. |
| Digital Interface | SPI-/QSPI-/MICROWIRE-compatible 3-wire serial (SCLK, DIN, DOUT, CS) - simplifies microcontroller connectivity with minimal GPIO usage. |
| 50/60Hz Rejection | 150dB common-mode, 98dB normal-mode - eliminates mains-frequency interference without external notch filters in weigh scale or metering designs. |
Pinout & Package
MX7705EWE+ is housed in a 16-pin SO (Small Outline) package, RoHS-compliant and lead-free, with standard 1.27mm pitch and 10.3mm × 7.5mm body dimensions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SCLK | Serial clock input | Drives synchronous data transfer up to 5MHz; timing-critical for register read/write and conversion result retrieval. |
| 4 CS | Active-low chip select | Enables 3-wire operation when tied to GND; isolates DOUT during multi-device SPI bus sharing. |
| 6 AIN2+, 7 AIN1+, 8 AIN1-, 11 AIN2- | Differential analog inputs | Support two independent fully differential channels; accept bipolar/unipolar signals with high source impedance when buffered. |
| 9 REF+, 10 REF- | Differential reference inputs | Set full-scale range (1.0–3.5V differential); internal reference not provided - requires external stable reference or ratiometric sensor excitation. |
| 12 DRDY | Active-low data-ready output | Indicates valid conversion result in data register; used for interrupt-driven sampling or polling synchronization. |
| 13 DOUT, 14 DIN | Serial data I/O | Half-duplex bidirectional data path; DOUT valid on SCLK rising edge, DIN sampled on rising edge - compatible with standard SPI masters. |
| 15 VDD, 16 GND | Power and ground | Single-supply operation; decoupling capacitor (0.1µF) required at VDD pin to maintain PSRR >86dB and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Pin- and software-compatible with AD7705 | Drop-in replacement for legacy AD7705 designs - no PCB or firmware changes required for migration. |
| Programmable-gain amplifier (1×–128×) | Eliminates need for external op-amp gain stages when measuring mV-level outputs from strain gauges or thermocouples. |
| Configurable digital filter notch (20–500Hz) | Allows precise alignment of first notch to local mains frequency (50Hz or 60Hz) for maximum interference rejection. |
| Internal analog input buffer | Supports transducer source impedances >10kΩ without gain error degradation - critical for RTD and bridge sensor interfaces. |
| Self- and system calibration | Corrects offset/gain drift over temperature and time; enables <±10ppm/°C gain stability after calibration. |
| Low-power power-down mode | Reduces supply current to 2µA typ - extends battery life in portable instrumentation and wireless sensor nodes. |
Applications
| Industrial Weigh Scales | Strain-Gauge Based Load Cells |
|---|---|
|
Use Scenario: High-accuracy weight measurement in platform scales and hopper systems with 20-bit effective resolution requirements. IC Role / Device Role / Timing Role: Primary ADC digitizing differential mV outputs from 4-wire Wheatstone bridges; performs on-chip gain scaling and 50/60Hz notch filtering. Use Value: Achieves ±0.003% FSR INL and 650nV noise floor to resolve sub-gram increments without external amplification or filtering components. |
Use Scenario: Static and quasi-static force measurement in structural health monitoring and material testing rigs. IC Role / Device Role / Timing Role: Dual-channel ADC acquiring synchronized strain readings from multiple bridge sensors; uses internal PGA to match varying gauge sensitivities. Use Value: Buffered inputs and 130dB CMR enable reliable acquisition from high-impedance foil gauges mounted on composite substrates with minimal signal degradation. |
| Loop-Powered 4–20mA Transmitters | RTD Temperature Measurement Systems |
|
Use Scenario: Smart field transmitters converting process variables (pressure, flow) into standardized 4–20mA outputs with HART modulation. IC Role / Device Role / Timing Role: Precision ADC digitizing sensor output while operating from <4mA loop power budget; manages power sequencing and low-current sleep states. Use Value: 2µA power-down current and 320µA active current allow full functionality within 3.5mA headroom - enabling diagnostics and digital communication without violating loop limits. |
Use Scenario: 3-wire or 4-wire RTD interfaces in HVAC controllers and industrial PLC analog input modules. IC Role / Device Role / Timing Role: ADC with programmable excitation current control (via external circuitry) and ratiometric reference support for Pt100/Pt1000 linearization. Use Value: 16-bit resolution with ±0.003% FSR INL ensures <0.1°C temperature accuracy over –40°C to +85°C, meeting Class A RTD tolerance standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7705BRUZ | Identical pinout, register map, and functional spec; same 16-bit sigma-delta architecture but higher typical supply current (400µA vs. 320µA at 3V). | Legacy design continuity where AD7705 footprint and firmware are already validated; less optimal for ultra-low-power deployments. | Select AD7705BRUZ only when existing layout/firmware must be reused without modification - MX7705EWE+ offers better power efficiency and identical interface behavior. |
| ADS1220IPWR | 24-bit resolution, integrated PGA (1–128), but requires external crystal; no built-in 50/60Hz notch filter - relies on digital post-processing. | Better resolution for high-end lab equipment; lacks hardware-level mains rejection - demands additional MCU resources for filtering. | Choose ADS1220IPWR when >16-bit ENOB is mandatory and system firmware can implement FIR filtering; MX7705EWE+ provides superior out-of-box 50/60Hz immunity with simpler host requirements. |
Compared with AD7705BRUZ, MX7705EWE+ reduces active current by 20% while maintaining full compatibility; versus ADS1220IPWR, it trades raw resolution for deterministic hardware-based 150dB 50/60Hz rejection and lower system-level design complexity.
Availability
MX7705EWE+ is available at Aetrix Electronics and suitable for industrial instrumentation, weigh scale manufacturing, and loop-powered transmitter design requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MX7705EWE+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MX7705EWE+ belongs to Maxim's precision sigma-delta ADC product line, engineered for high-accuracy, low-power measurement in harsh industrial environments - emphasizing noise immunity, calibration robustness, and transducer interface simplicity.
FAQ
What is the maximum clock frequency supported by the MX7705EWE+ serial interface?
The MX7705EWE+ supports an SCLK frequency up to 5MHz, enabling fast register access and conversion result reads. This allows full 16-bit word transfers in under 4µs, supporting high-throughput sampling in systems with tight timing constraints - essential for real-time control loops using the MX7705EWE+.
Does the MX7705EWE+ include an internal voltage reference?
No, the MX7705EWE+ does not include an internal voltage reference. It requires an external differential reference applied to REF+ and REF− pins, with a valid range of 1.0V to 3.5V (depending on VDD). This design enables ratiometric measurements with sensor excitation circuits and supports user-selected reference stability and accuracy - a key feature of the MX7705EWE+ architecture.
How does the MX7705EWE+ achieve 150dB 50Hz/60Hz common-mode rejection?
The MX7705EWE+ achieves 150dB common-mode rejection through its programmable digital filter, which places the first notch precisely at 25Hz (for 50Hz rejection) or 20Hz (for 60Hz rejection). This hardware-based filtering occurs after the sigma-delta modulator and is independent of analog front-end matching - a core capability of the MX7705EWE+ that eliminates need for external analog notch filters.
Can the MX7705EWE+ operate from a 3.3V supply while maintaining full 16-bit performance?
Yes, the MX7705EWE+ operates across 2.7V–5.25V and maintains full 16-bit no-missing-codes performance at 3.3V. Electrical characteristics including ±0.003% FSR INL, 650nV RMS noise (typ), and 150dB 50/60Hz rejection are all specified and guaranteed at VDD = 3V - making the MX7705EWE+ fully suitable for modern 3.3V industrial microcontroller platforms.
Is the MX7705EWE+ pin-compatible with the AD7705 across all package variants?
Yes, the MX7705EWE+ is pin-compatible with the AD7705 in the 16-pin SO package (same pad layout, footprint, and pin functions). This includes identical assignments for SCLK, CS, DOUT, DIN, AIN1±, AIN2±, REF±, DRDY, RESET, CLKIN/CLKOUT, VDD, and GND - enabling direct substitution in AD7705-based designs without layout changes, a defining feature of the MX7705EWE+.
MX7705EWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MX7705EWE+ FAQ
1.How can I place an order for MX7705EWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MX7705EWE+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MX7705EWE+ reliable?
The price and inventory of MX7705EWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MX7705EWE+ is usually 5 days.
3.What payment methods are accepted for MX7705EWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MX7705EWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MX7705EWE+?
MX7705EWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MX7705EWE+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MX7705EWE+?
For technical support, including MX7705EWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MX7705EWE+ requirements.
6.How does Aetrix verify that MX7705EWE+ is sourced from the original manufacturer or authorized distributors?
All MX7705EWE+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MX7705EWE+ meets industry standards.
7.What is the process for return or replacement of MX7705EWE+?
All MX7705EWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MX7705EWE+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MX7705EWE+ part is unused and in its original packaging.
Return procedure for MX7705EWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MX7705EWE+ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
