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Analog Devices Inc./Maxim Integrated MAX11203EEE+
- Part No.:
- MAX11203EEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX11203EEE+.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:716
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Product details
Overview
MAX11203EEE+ from Maxim Integrated is a 16-bit, single-channel, ultra-low-power delta-sigma ADC with integrated SPI interface, four GPIOs, and optional input/reference buffers. It delivers 16-bit noise-free resolution at 10sps, <300µA total active current, and >100dB 50Hz/60Hz line-noise rejection - optimized for high-impedance sensor interfaces in 4–20mA industrial loops.
For engineers reviewing the MAX11203EEE+ datasheet, MAX11203EEE+ pinout, MAX11203EEE+ application, or MAX11203EEE+ equivalent, key selection criteria include its programmable data rates (1–120sps), internal 2.048MHz/2.4576MHz oscillator, SINC4 digital filter, and support for unipolar/bipolar input ranges with self- and system-calibration capability.
Technical Context
The MAX11203EEE+ employs a third-order delta-sigma modulator with SINC4 digital filtering, enabling spectral nulls at integer multiples of the output data rate. Its internal oscillator eliminates external timing components and supports LINEF-selectable frequencies (2.048MHz for 50Hz rejection, 2.4576MHz for 60Hz rejection).
It features fully differential analog inputs (AINP/AINN) and reference inputs (REFP/REFN), both configurable with optional buffers to reduce input current to 20nA (signal) or 30nA (reference). Calibration is supported via on-demand offset/gain self-calibration and user-programmable calibration registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise-Free Resolution | 16 bits at 10sps - guarantees no missing codes and full 16-bit effective resolution under low-noise conditions. |
| Total Active Current | <300µA (max) at 3.6V AVDD/1.7V DVDD - enables multi-year battery life in portable instrumentation. |
| 50Hz/60Hz Rejection | >100dB (min) at 1–15sps - eliminates mains interference without external notch filters in weigh scales or sensor transmitters. |
| INL Error | ±20ppmFSR (max) - ensures ≤0.002% full-scale linearity error across -40°C to +85°C for precision temperature/pressure measurement. |
| Digital Interface | SPI-compatible serial interface with RDY/DOUT dual-function pin - simplifies microcontroller integration with ready-signal handshake and minimal pin count. |
| Input Buffer Support | Configurable signal and reference buffers - isolates switched-capacitor sampling network, enabling direct connection to >1MΩ sensor sources without dynamic range loss. |
| Operating Voltage Ranges | AVDD: 2.7–3.6V; DVDD: 1.7–3.6V - supports mixed-supply systems and brown-out resilience in industrial environments. |
Pinout & Package
MAX11203EEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch), RoHS-compliant and rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 16 | GPIO1–GPIO4 | Register-controlled digital I/Os - drive external analog multiplexers (e.g., MAX313) for multi-sensor scanning without additional MCU GPIOs. |
| 4 | GND | Analog/digital common ground reference - requires star-point connection to minimize noise coupling between AVDD and DVDD domains. |
| 5, 6 | REFP / REFN | Differential reference inputs - accept 0–VAVDD common-mode range; buffer enable reduces reference input current to 30nA for stable external reference use. |
| 7, 8 | AINN / AINP | Fully differential analog inputs - support ±VREF (bipolar) or 0–VREF (unipolar); input buffers allow direct interfacing with thermocouples or bridge sensors. |
| 9 | AVDD | Analog supply (2.7–3.6V) - powers modulator, reference circuitry, and input buffers; separate from DVDD to suppress digital switching noise. |
| 10 | DVDD | Digital supply (1.7–3.6V) - powers SPI logic and GPIOs; independent voltage rail enables low-voltage MCU interfacing. |
| 11 | CS | Active-low chip select - enables SPI transaction framing; must remain low for entire 24-bit read/write cycle. |
| 12 | DIN | Serial data input - accepts command and register-write bytes on SCLK rising edge; supports configuration of CTRL1–CTRL3 registers. |
| 13 | RDY/DOUT | Open-drain ready flag + SPI data output - asserts low when conversion result is valid; outputs MSB-first 24-bit data on SCLK falling edge. |
| 14 | SCLK | Serial clock input - up to 5MHz; controls timing of DIN sampling and DOUT output; duty cycle ≥60% required. |
| 15 | CLK | External clock input - optional 2.048MHz/2.4576MHz/2.25275MHz source for enhanced 50Hz+60Hz simultaneous rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low power operation | 235–300µA total active current and <0.4µA sleep current - extends battery life in handheld test equipment and remote sensors. |
| Integrated SINC4 digital filter | Provides guaranteed >100dB 50Hz/60Hz rejection at 1–15sps - eliminates need for external analog filtering in industrial control applications. |
| On-demand self-calibration | 200ms offset/gain self-calibration - corrects internal drift without external zero/full-scale references, improving long-term accuracy in unattended systems. |
| Configurable input buffering | Independent SIGBUF/REFBUF control - reduces analog input current from 1.4nA/V to 20nA and reference current from 2.1nA/V to 30nA, preserving SNR with high-Z sources. |
| Four SPI-controllable GPIOs | Programmable direction and state via CTRL2 register - enables seamless control of external analog switches for multi-channel sensor polling with zero latency overhead. |
Applications
| Industrial 4–20mA Sensor Transmitter | Portable Pressure Gauge |
|---|---|
Use Scenario: Digitizing output of strain-gauge or RTD-based pressure sensors in loop-powered field instruments with strict power budget. IC Role / Device Role / Timing Role: Primary sigma-delta ADC acquiring buffered differential sensor signals at 10–15sps with internal oscillator and SINC4 filtering. Use Value: Eliminates external crystal and analog anti-aliasing filters while delivering 16-bit NFR and >100dB line-noise rejection - reducing BOM cost and PCB area by >30%. | Use Scenario: Battery-powered handheld device measuring HVAC duct static pressure using piezoresistive sensor. IC Role / Device Role / Timing Role: Low-power ADC with sleep-mode current <0.4µA, waking on button press to acquire 16-bit readings at 10sps. Use Value: Enables >5-year battery life on two AA cells due to sub-300µA active current and fast 200ms self-calibration on wake-up. |
| Weigh Scale Load Cell Interface | Temperature Monitoring Node |
Use Scenario: High-accuracy weighing system using Wheatstone bridge load cell with mV-level output. IC Role / Device Role / Timing Role: Precision ADC with programmable gain (via MAX11213 variant), but MAX11203EEE+ used with external PGA for fixed-gain 16-bit acquisition at 10sps. Use Value: Achieves ≤20ppm INL and 570nVRMS noise at 10sps - resolving sub-gram changes on 100kg platform with no external amplification. | Use Scenario: Distributed node monitoring ambient temperature via thermistor in building automation system. IC Role / Device Role / Timing Role: ADC digitizing buffered thermistor voltage with internal reference, operating at 2.5sps to maximize SNR and minimize average power. Use Value: Delivers 16-bit noise-free resolution at 2.5sps with 0.57µVRMS noise - enabling ±0.1°C accuracy over -40°C to +85°C without calibration lookup tables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPWR | 24-bit resolution, integrated PGA (1–128x), higher 350µA active current, 32-pin TSSOP package | Targets higher-resolution applications requiring on-chip gain; less suitable for ultra-low-power battery operation | Select MAX11203EEE+ when 16-bit resolution, sub-300µA current, and QSOP footprint are prioritized over programmable gain. |
| AD7170BRUZ | 16-bit, 100µA typical active current, no GPIOs, 16-pin TSSOP, lower 50Hz/60Hz rejection (85dB) | Better suited for space-constrained, lowest-power designs where GPIO control and >100dB line rejection are not required | Choose MAX11203EEE+ when GPIO-driven multiplexer control and guaranteed >100dB 50/60Hz rejection are essential for industrial sensor nodes. |
Compared with ADS124S08IPWR and AD7170BRUZ, the MAX11203EEE+ uniquely balances ultra-low power (<300µA), integrated GPIOs for sensor multiplexing, and guaranteed >100dB line-noise rejection in a compact QSOP package - making it optimal for battery- and loop-powered industrial transmitters.
Availability
MAX11203EEE+ is available at Aetrix Electronics and suitable for industrial sensor transmitters, portable instrumentation, and battery-powered weigh scales requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MAX11203EEE+ 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) designs high-performance analog and mixed-signal ICs for industrial, automotive, and communications markets, with emphasis on integration, power efficiency, and reliability.
The MAX11203/MAX11213 product line targets ultra-low-power, high-accuracy sensor signal conditioning in resource-constrained environments - specifically engineered for 4–20mA loop-powered devices and battery-operated instrumentation.
FAQ
What is the maximum data rate supported by the MAX11203EEE+ in single-cycle mode?
The MAX11203EEE+ supports up to 120sps in single-cycle conversion mode when configured with LINEF = 0 (2.4576MHz internal oscillator). At this rate, the device delivers 16-bit noise-free resolution with no data latency, making it ideal for responsive industrial monitoring where real-time updates are critical. The MAX11203EEE+ achieves this performance while maintaining <300µA total active current consumption.
Does the MAX11203EEE+ require an external crystal or oscillator?
No, the MAX11203EEE+ includes a high-accuracy internal oscillator trimmed to 2.048MHz or 2.4576MHz - selectable via the LINEF bit - eliminating the need for external timing components. An external clock can be applied to the CLK pin for enhanced 50Hz/60Hz simultaneous rejection (e.g., 2.25275MHz), but it is optional. This internal oscillator reduces BOM cost and board space while ensuring robust operation across -40°C to +85°C.
How does the MAX11203EEE+ handle 50Hz and 60Hz line noise rejection?
The MAX11203EEE+ uses its SINC4 digital filter to provide >100dB minimum rejection of 50Hz or 60Hz line noise at data rates from 1sps to 15sps. With LINEF = 1 (2.048MHz oscillator), 50Hz rejection is maximized; with LINEF = 0 (2.4576MHz), 60Hz rejection is optimized. For simultaneous 50Hz/60Hz suppression, an external 2.25275MHz clock applied to CLK guarantees ≥80dB at 50Hz and ≥85dB at 60Hz - all without external analog filters.
Can the MAX11203EEE+ interface directly with high-impedance sensors like thermocouples?
Yes, the MAX11203EEE+ supports optional input buffers on both AINP/AINN and REFP/REFN, reducing analog input current to 20nA and reference input current to 30nA. This allows direct connection to high-impedance sources such as thermocouples or RTDs without degrading dynamic range or linearity. Buffer enable is controlled via the SIGBUF and REFBUF bits in the CTRL1 register, and the buffers operate across the full -40°C to +85°C temperature range.
What calibration options are available on the MAX11203EEE+?
The MAX11203EEE+ offers three calibration levels: (1) on-demand self-calibration (200ms, corrects internal offset/gain), (2) system calibration using external zero/full-scale inputs (100ms each), and (3) user-programmable offset/gain registers via SPI. All calibrations are controlled through the CAL1/CAL0 bits and CTRL3 register. After power-up, internal calibration registers are disabled by default, so self- or system-calibration is required to achieve full-scale digital output range.
MAX11203EEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 480
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 1.7V ~ 3.6V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11203EEE+ FAQ
1.How can I place an order for MAX11203EEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11203EEE+ 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 MAX11203EEE+ reliable?
The price and inventory of MAX11203EEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11203EEE+ is usually 5 days.
3.What payment methods are accepted for MAX11203EEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11203EEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11203EEE+?
MAX11203EEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11203EEE+ 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 MAX11203EEE+?
For technical support, including MAX11203EEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11203EEE+ requirements.
6.How does Aetrix verify that MAX11203EEE+ is sourced from the original manufacturer or authorized distributors?
All MAX11203EEE+ 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 MAX11203EEE+ meets industry standards.
7.What is the process for return or replacement of MAX11203EEE+?
All MAX11203EEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX11203EEE+, 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 MAX11203EEE+ part is unused and in its original packaging.
Return procedure for MAX11203EEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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