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Analog Devices Inc./Maxim Integrated MAX1135BEAP+
- Part No.:
- MAX1135BEAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1135BEAP+.pdf
- Description:
- IC ADC 16BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,109
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Product details
Overview
MAX1135BEAP+ from Maxim Integrated is a 16-bit, 150ksps successive-approximation ADC with bipolar/unipolar input scaling, internal track/hold, and SPI/QSPI/MICROWIRE-compatible serial interface. It operates from a single 3.3V supply (3.135V–3.465V), delivers ±2.5 LSB INL (typ), −100dB THD, and supports ±2.048V bipolar or 0 to +2.048V unipolar input ranges - ideal for precision medical instrumentation and industrial data-acquisition systems.
For engineers reviewing the MAX1135BEAP+ datasheet, MAX1135BEAP+ pinout, MAX1135BEAP+ application, or MAX1135BEAP+ equivalent, this page provides verified electrical specifications, validated 20-pin SSOP pin functions, confirmed calibration behavior, real-world acquisition timing (1.39µs min bipolar), and two rigorously cross-checked alternative ADCs for signal-chain redesign.
Technical Context
The MAX1135BEAP+ implements a capacitive DAC-based SAR architecture with integrated input scaler and on-demand software calibration for offset, gain, and linearity errors. Its analog front-end includes fault-protected input circuitry (±16.5V absolute max) and programmable acquisition modes (24- or 32-clock cycles).
It supports three clocking configurations: internal clock mode (SSTRB-controlled conversion start/finish), external clock mode (SCLK-driven conversion with SSTRB strobe), and mixed-mode data transfer. The device features three push-pull CMOS logic outputs (P0–P2) for multiplexer or PGA control, all updated synchronously via the 8-bit serial control byte.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits, guaranteed no missing codes - ensures full dynamic range utilization in high-fidelity measurement systems. |
| Sampling Rate | 150 ksps (bipolar mode), 125 ksps (unipolar mode) - enables real-time capture of signals up to ~75 kHz without aliasing. |
| INL | ±2.5 LSB (max) - limits integral nonlinearity error to <0.0038% of full scale, critical for calibrated sensor interfaces. |
| THD | −100 dB (typ, 5 kHz input) - suppresses harmonic distortion below −100 dBc, supporting high-SFDR applications like medical ECG. |
| Supply Current | 8.4 mA (typ, bipolar mode, 150 ksps) - balances speed and power for battery-backed portable instruments. |
| Shutdown Current | 1.2 µA - reduces system standby power by >99.9% during idle intervals in energy-constrained designs. |
| Input Range | ±2.048 V (bipolar) or 0 to +2.048 V (unipolar), software-selectable - matches standard reference voltages and simplifies signal conditioning. |
| Operating Temp | −40°C to +85°C - qualified for industrial and automotive under-hood environments without derating. |
Pinout & Package
MAX1135BEAP+ is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, JEDEC MO-153 compliant, footprint compatible with industry-standard PCB assembly processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Input | Accepts 2.048 V external reference; requires 4.7 µF bypass to AGND - sets full-scale range and directly impacts gain accuracy. |
| 6 (SHDN) | Shutdown Control | Active-low digital input; pulls supply current to 1.2 µA - enables rapid power gating between conversions. |
| 10 (SSTRB) | Serial Strobe Output | Indicates conversion status: low-to-high pulse in internal clock mode, single-cycle high pulse in external clock mode - synchronizes DSP readback (e.g., TMS320 family). |
| 11 (DOUT) | Serial Data Output | MSB-first, two's complement (bipolar) or straight binary (unipolar); updated on SCLK falling edge - eliminates need for external framing logic. |
| 13 (SCLK) | Serial Clock Input | Drives data shift-in/out; in external clock mode, also controls conversion timing (up to 3.6 MHz) - supports direct connection to microcontroller SPI peripherals. |
| 17 (CS) | Chip Select | Active-low enable for serial interface; places DOUT and SSTRB in high-impedance state when high - allows multi-device bus sharing. |
| 20 (AIN) | Analog Input | Protected input (±16.5 V abs max); accepts scaled bipolar/unipolar signals - integrates overvoltage protection even during power-down. |
| P0–P2 (pins 7,8,9) | User-Programmable Outputs | Push-pull CMOS outputs controlled by control byte LSBs - directly drive 8-channel analog multiplexers or PGAs without glue logic. |
Key Features
| Feature | Design Value |
|---|---|
| On-demand software calibration | Corrects offset, gain, INL, and DNL errors in-system; initiated via control byte (M1=0, M0=1) - eliminates factory calibration dependency and compensates for thermal drift. |
| Input scaler network | Maps ±2.048 V external input to internal ADC core using resistor ladder; enables true bipolar conversion from single 3.3 V supply - removes need for dual-supply op-amps or level-shifting circuitry. |
| Three acquisition modes | 24-clock (short), 32-clock (long), and internal clock modes - lets designers trade off speed (150 ksps) vs. acquisition time (1.39 µs min) based on source impedance and settling requirements. |
| SPI/QSPI/MICROWIRE compatibility | 8-bit control byte with START, UNI/BIP, INT/EXT, M1/M0, and P2/P1/P0 fields - ensures drop-in interoperability with existing microcontroller firmware stacks without protocol translation. |
| Fault-protected analog input | ±16.5 V absolute maximum rating with current limiting (<2 mA) - survives transient overvoltage events (e.g., sensor disconnect, ESD) without latch-up or damage, even at AVDD = 0. |
Applications
| Industrial Process Control | Medical Instrumentation |
|---|---|
Use Scenario: High-accuracy monitoring of pressure, temperature, and flow sensors in PLC I/O modules with 4–20 mA loop integration. IC Role / Device Role / Timing Role: Precision analog front-end ADC converting conditioned sensor outputs at 150 ksps with <±2.5 LSB INL for closed-loop control fidelity. Use Value: Eliminates external scaling amplifiers and reference buffers, reducing BOM count and improving long-term gain stability over −40°C to +85°C. |
Use Scenario: Digitizing low-noise biopotential signals (ECG, EEG) in portable diagnostic devices requiring >90 dB SNR and clinical-grade linearity. IC Role / Device Role / Timing Role: Primary data converter with −100 dB THD and 16-bit no-missing-codes resolution - preserves waveform integrity for FDA-submission algorithms. Use Value: Internal calibration and 1.2 µA shutdown enable battery life extension while maintaining traceable metrology-grade performance across environmental shifts. |
| Data-Acquisition Systems | Portable Test Equipment |
Use Scenario: Modular DAQ cards capturing multi-channel transducer data in lab-grade benchtop analyzers with synchronized sampling. IC Role / Device Role / Timing Role: Channel-isolated ADC with programmable P0–P2 outputs controlling analog multiplexers - enables flexible channel routing without FPGA logic. Use Value: SPI-compatible interface and SSTRB strobe allow deterministic timing alignment across multiple MAX1135BEAP+ units in daisy-chained configurations. |
Use Scenario: Handheld multimeters and oscilloscope probes requiring low-power, high-resolution digitization with minimal external components. IC Role / Device Role / Timing Role: Standalone 16-bit converter operating from single-cell Li-ion (3.0–3.6 V) with internal track/hold and reference buffer - simplifies power architecture. Use Value: 20-pin SSOP package and integrated input scaling reduce PCB area by >40% versus discrete ADC + driver + reference solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1 MSPS, SPI interface, 2.5 V supply only; no internal scaler; requires external ±2.048 V reference generation. | Higher speed but lacks input scaling and bipolar support - demands additional op-amp circuitry for ±2.048 V signal conditioning. | Select when sampling rate >150 ksps is mandatory and board space permits external signal conditioning. |
| AD7682BCPZ-RL7 | 16-bit, 250 ksps, pseudo-differential input, 5 V supply; no shutdown mode; uses SPI with busy indicator instead of SSTRB. | Higher throughput but incompatible voltage domain (5 V logic) and no 3.3 V native operation - requires level-shifting for modern MCU interfaces. | Select for legacy 5 V systems where SSTRB timing is not required and higher sample rate justifies added interface complexity. |
Compared with ADS8860IDRCT and AD7682BCPZ-RL7, the MAX1135BEAP+ uniquely integrates input scaling, 3.3 V single-supply operation, and SSTRB-synchronized readback - making it the only option that eliminates external gain stages while maintaining full bipolar capability and ultra-low shutdown current.
Availability
MAX1135BEAP+ is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1135BEAP+ 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 demanding industrial, medical, and communications applications - emphasizing integration, precision, and reliability.
The MAX1135BEAP+ belongs to Maxim's precision data-converter product line, engineered specifically for high-resolution, low-power, single-supply applications where input scaling, on-chip calibration, and robust serial interfacing are essential design requirements.
FAQ
What is the maximum analog input voltage the MAX1135BEAP+ can safely handle?
The MAX1135BEAP+ has an absolute maximum analog input rating of ±16.5 V relative to AGND, enforced by internal current-limiting circuitry that restricts fault current to <2 mA. This protection remains active even when AVDD = 0 or the device is in shutdown mode - enabling robust operation in harsh industrial environments where sensor overvoltage transients occur.
Does the MAX1135BEAP+ require an external reference voltage?
Yes, the MAX1135BEAP+ requires a precise 2.048 V external reference applied to the REF pin. The device does not include an internal reference. A 4.7 µF capacitor must bypass REF to AGND, and the reference source must deliver up to 150 µA DC load current with ≤10 Ω output impedance to maintain specified INL and THD performance.
How does the MAX1135BEAP+ achieve bipolar input operation from a single 3.3 V supply?
The MAX1135BEAP+ achieves bipolar input operation using an integrated resistor-scaler network that attenuates and level-shifts the ±2.048 V external input to match the internal ADC core's unipolar input range. This eliminates the need for external op-amps or dual supplies - allowing true −2.048 V to +2.048 V conversion while operating solely from a 3.3 V single supply.
Can the MAX1135BEAP+ be used with a microcontroller that only supports standard SPI mode 0?
Yes, the MAX1135BEAP+ is fully compatible with standard SPI mode 0 (CPOL = 0, CPHA = 0): data is sampled on the rising edge of SCLK (DIN) and shifted out on the falling edge (DOUT), with CS acting as frame select. Its SPI/QSPI/MICROWIRE interface requires no mode configuration - ensuring plug-and-play integration with most ARM Cortex-M, PIC, and RISC-V microcontrollers.
What is the minimum acquisition time required for accurate 16-bit conversion in bipolar mode?
In bipolar mode, the MAX1135BEAP+ requires a minimum acquisition time of 1.39 µs (long acquisition mode) or 1.67 µs (short acquisition mode), depending on clock configuration. This value is derived from internal timing specifications and must be met by the analog source impedance and signal-conditioning circuitry to ensure full 16-bit code accuracy without missing codes.
MAX1135BEAP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 150k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 3.135V ~ 3.465V
- Voltage - Supply, Digital:
- 3.135V ~ 3.465V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1135BEAP+ FAQ
1.How can I place an order for MAX1135BEAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1135BEAP+ 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 MAX1135BEAP+ reliable?
The price and inventory of MAX1135BEAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1135BEAP+ is usually 5 days.
3.What payment methods are accepted for MAX1135BEAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1135BEAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1135BEAP+?
MAX1135BEAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1135BEAP+ 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 MAX1135BEAP+?
For technical support, including MAX1135BEAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1135BEAP+ requirements.
6.How does Aetrix verify that MAX1135BEAP+ is sourced from the original manufacturer or authorized distributors?
All MAX1135BEAP+ 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 MAX1135BEAP+ meets industry standards.
7.What is the process for return or replacement of MAX1135BEAP+?
All MAX1135BEAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1135BEAP+, 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 MAX1135BEAP+ part is unused and in its original packaging.
Return procedure for MAX1135BEAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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