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Analog Devices Inc./Maxim Integrated MAX11156ETC+T
- Part No.:
- MAX11156ETC+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX11156ETC+T.pdf
- Description:
- IC ADC 18BIT SAR 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,650
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Product details
Overview
MAX11156ETC+T from Maxim Integrated is an 18-bit, 500ksps successive approximation register (SAR) analog-to-digital converter with true ±5V bipolar input range, integrated 4.096V reference and buffer, and SPI-compatible serial interface. It operates from a single 5V analog supply and 2.3V–5.25V digital supply, delivering 94.6dB SNR and ±2.8 LSB INL (typ) for high-precision data acquisition in industrial control and medical instrumentation.
For engineers reviewing the MAX11156ETC+T datasheet, MAX11156ETC+T pinout, MAX11156ETC+T application, or MAX11156ETC+T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support for production deployment.
Technical Context
The MAX11156ETC+T implements a patented charge-pump input architecture enabling direct sampling of high-impedance sources without external scaling resistors, eliminating source-loading errors when the track-and-hold fully settles. Its pseudo-differential input stage achieves 6MHz small-signal bandwidth and 400ns transient response to full-scale step.
It supports four configurable reference modes via internal register: internal bandgap + buffer (mode 0), external reference + internal buffer (mode 1), internal bandgap only (mode 2), or fully external reference/buffer (mode 3). Reference mode 3 delivers optimal AC performance: 94.6dB SNR and –101.4dB THD at 10kHz with 4.096V reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with guaranteed no-missing-codes - ensures monotonicity and eliminates code gaps in critical measurement systems. |
| Throughput Rate | 500ksps with zero pipeline latency - enables real-time sampling of fast transients in automated test equipment without delay compensation. |
| Input Range | True ±5V (10VP-P) bipolar - accepts industrial sensor outputs (e.g., ±5V LVDTs, strain gauges) without level-shifting circuitry. |
| SNR / THD | 94.6dB SNR and –101.4dB THD (typ, 10kHz) - supports >15.5 ENOB for high-fidelity signal capture in medical ECG/EEG front-ends. |
| Reference | Integrated 4.096V bandgap reference with 6ppm/°C tempco (typ) - eliminates need for external precision reference and reduces BOM count by one component. |
| Power | 25.8mW at 500ksps (VDD=5V, OVDD=3.3V, ref mode 2/3) - enables low-power portable instrumentation with thermal budget under 135mW. |
| Digital Interface | SPI/QSPI/MICROWIRE/DSP-compatible serial interface - allows daisy-chaining multiple ADCs for synchronized multichannel acquisition without FPGA logic overhead. |
Pinout & Package
MAX11156ETC+T is housed in a 12-pin, 3mm × 3mm TDFN package with exposed pad (EP) connected to PCB ground for thermal and noise performance. Pin functions are validated per Maxim's official datasheet Rev 2 (10/2015).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFIO | Internal reference output / external reference input | Provides buffered 4.096V reference (mode 0) or accepts 3.0–4.25V external reference (mode 1); requires 0.1µF bypass to AGNDS. |
| REF | Reference buffer decoupling node | Output of internal reference buffer; must be bypassed with 10µF X5R/X7R capacitor to AGNDS for 18-bit stability. |
| VDD | Analog power supply | 4.75–5.25V analog rail; powers SAR core and reference; requires local 0.1µF + board-level 10µF bypassing. |
| AIN+, AIN- | Pseudo-differential analog inputs | Accept ±5V true bipolar signal; AIN- serves as remote sense ground; common-mode rejection supports noisy industrial environments. |
| CNVST | Convert start trigger | Rising edge initiates conversion; falling edge with SCLK high enables serial interface - enables precise timing control in deterministic systems. |
| DOUT, DIN, SCLK | SPI-compatible serial interface | Supports 14ns min SCLK period (VOVDD > 4.5V); DOUT valid on SCLK falling edge - simplifies timing closure in high-speed microcontroller interfaces. |
| OVDD | Digital I/O supply | 2.3–5.25V logic rail; independent of VDD - allows interfacing with 2.5V/3.3V/5V controllers without level shifters. |
| AGNDS | Analog ground sense | Zero-current reference for internal DAC and reference; must connect to clean analog ground plane - critical for achieving specified INL/SNR. |
Key Features
| Feature | Design Value |
|---|---|
| Patented charge-pump input architecture | Enables direct sampling of high-Z sources (e.g., piezoelectric sensors) with zero loading error - removes need for op-amp buffers in many applications. |
| Four programmable reference modes | Supports system-level flexibility: shared reference across multiple ADCs (mode 1), ultra-low-noise internal reference (mode 0), or external ultra-stable reference (mode 3). |
| ±20mA overvoltage input clamps | Protects against field-induced transients up to ±7V at AIN+ - eliminates need for external TVS diodes in industrial PLC I/O modules. |
| 1.6 LSBRMS transition noise | Ensures stable code output during repeated sampling of static signals - critical for high-resolution weight scales and precision calibration equipment. |
| 10µA shutdown current | Reduces standby power in battery-operated portable analyzers - extends runtime between charges without sacrificing wake-up latency. |
Applications
| Data Acquisition Systems | Industrial Control Systems |
|---|---|
|
Use Scenario: High-channel-count modular DAQ for factory-floor vibration monitoring using accelerometers with ±5V output. IC Role / Device Role / Timing Role: Single-channel 18-bit SAR ADC digitizing conditioned sensor outputs; CNVST-triggered synchronous sampling across 16 channels via daisy-chained interface. Use Value: 94.6dB SNR enables detection of sub-millig acceleration harmonics; ±5V input matches industrial sensor standards without signal conditioning. |
Use Scenario: Analog input module in programmable logic controller (PLC) accepting 4–20mA current loops via precision shunt resistors. IC Role / Device Role / Timing Role: Precision ADC converting shunt voltage (±5V full-scale) into digital process variable; operates continuously at 500ksps for fast loop update rates. Use Value: ±2.8 LSB INL ensures <0.01% FSR linearity error across temperature; internal reference eliminates drift-related calibration cycles. |
| Medical Instrumentation | Automatic Test Equipment |
|
Use Scenario: Front-end digitizer in portable ECG monitor acquiring biopotential signals with DC-coupled ±5V range. IC Role / Device Role / Timing Role: Low-noise, low-latency ADC capturing raw electrode voltages; uses internal reference for consistent gain across patient measurements. Use Value: 1.6 LSBRMS transition noise prevents false arrhythmia detection; 400ns transient response captures QRS complex fidelity. |
Use Scenario: Digitizer channel in benchtop ATE system performing parametric testing of analog ICs at 500ksps. IC Role / Device Role / Timing Role: High-accuracy ADC measuring device-under-test output voltage; synchronized via CNVST to stimulus generator for phase-coherent sampling. Use Value: Guaranteed no-missing-codes prevents test escape; daisy-chain capability enables 8-channel parallel test without additional controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 18-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX11158ETC+T | Same 18-bit/500ksps SAR architecture but with 0–5V unipolar input range and identical internal reference. | Requires external level-shifting for ±5V signals; better suited for single-supply sensor interfaces (e.g., RTDs, thermocouples with cold-junction compensation). | Select MAX11158ETC+T when input signals are inherently unipolar and board space permits simple resistor-based offset networks. |
| AD7606C-18BSTZ | 18-bit, 1MSPS simultaneous-sampling octal ADC with on-chip analog front-end, ±10V input, and 2.5V reference (not adjustable). | Offers 8-channel sync sampling but larger 64-lead LQFP package; higher power (120mW); fixed reference limits flexibility vs. MAX11156ETC+T's 4 reference modes. | Choose AD7606C-18BSTZ for multi-channel synchronized acquisition where channel count outweighs size/power constraints. |
Compared with MAX11158ETC+T, MAX11156ETC+T provides native bipolar operation eliminating level-shift design complexity; versus AD7606C-18BSTZ, it offers smaller footprint and lower power at the cost of single-channel operation and flexible reference configuration.
Availability
MAX11156ETC+T is available at Aetrix Electronics and suitable for data acquisition systems, industrial control systems, and medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing for ISO 13485 and IEC 61508 compliance.
Supply support for MAX11156ETC+T 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 precision analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX11156ETC+T belongs to Maxim's high-accuracy SAR ADC family targeting applications demanding true bipolar input, low latency, and integrated reference - specifically engineered for space-constrained, high-reliability measurement systems.
FAQ
What is the absolute maximum input voltage range for MAX11156ETC+T?
The MAX11156ETC+T specifies an absolute input voltage range of ±(VDD + 0.1V) on AIN+, and –0.1V to +0.1V on AIN-. With VDD = 5V, this translates to –5.1V to +5.1V on AIN+ and –100mV to +100mV on AIN-. Exceeding these limits risks permanent damage. The device includes ±20mA overvoltage clamps that activate beyond ±(VDD + 0.3V), but accurate conversion requires staying within the ±(VDD + 0.1V) range.
Does MAX11156ETC+T require external decoupling capacitors, and if so, what values?
Yes, MAX11156ETC+T requires specific decoupling: a 0.1µF ceramic capacitor from VDD to GND and another from OVDD to GND, placed as close as possible to their respective pins; a 10µF X5R or X7R capacitor from REF to AGNDS; and a 0.1µF capacitor from REFIO to AGNDS. These values are mandatory per Maxim's layout guidelines to achieve specified SNR, INL, and reference stability - omitting or substituting them degrades 18-bit performance.
Can MAX11156ETC+T interface directly with a 1.8V microcontroller?
No, MAX11156ETC+T cannot interface directly with a 1.8V microcontroller. Its digital I/O supply (OVDD) has a minimum rating of 2.3V, and input voltage thresholds are defined as VIH = 0.7 × OVDD and VIL = 0.3 × OVDD. At OVDD = 2.3V, VIH = 1.61V - below typical 1.8V logic-high levels - risking unreliable communication. A level shifter or 2.5V/3.3V controller is required.
What reference mode should be used to achieve the best AC performance (SNR/THD)?
Reference Mode 3 delivers the best AC performance for MAX11156ETC+T: it uses an external 4.096V reference applied to the REF pin while disabling the internal bandgap and buffer. In this mode, the datasheet specifies 94.6dB SNR and –101.4dB THD (typ) at 10kHz. This mode minimizes reference noise contribution, making it ideal for FFT-based spectral analysis in automatic test equipment.
Is the MAX11156ETC+T pinout compatible with other devices in the MAX111xx family?
No, MAX11156ETC+T is not pin-compatible with other MAX111xx family members. While the 12-pin TDFN package is shared across several variants (e.g., MAX11158, MAX11166), pin functions differ significantly - notably REFIO/REF assignments and internal reference configuration logic. For example, MAX11158 uses REFIO as dedicated external reference input only, whereas MAX11156ETC+T repurposes it for internal reference output in mode 0. PCB layout must be unique to MAX11156ETC+T.
MAX11156ETC+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- ±5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 12-TDFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11156ETC+T FAQ
1.How can I place an order for MAX11156ETC+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11156ETC+T 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 MAX11156ETC+T reliable?
The price and inventory of MAX11156ETC+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11156ETC+T is usually 5 days.
3.What payment methods are accepted for MAX11156ETC+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11156ETC+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11156ETC+T?
MAX11156ETC+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11156ETC+T 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 MAX11156ETC+T?
For technical support, including MAX11156ETC+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11156ETC+T requirements.
6.How does Aetrix verify that MAX11156ETC+T is sourced from the original manufacturer or authorized distributors?
All MAX11156ETC+T 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 MAX11156ETC+T meets industry standards.
7.What is the process for return or replacement of MAX11156ETC+T?
All MAX11156ETC+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX11156ETC+T, 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 MAX11156ETC+T part is unused and in its original packaging.
Return procedure for MAX11156ETC+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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