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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:
- 16-BIT ADC, 150KSPS
- Quantity:
- Payment:
- Shipping:
Inventory:214
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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), accepts ±2.048V or 0–+2.048V analog inputs, and delivers −100dB THD and 92dB SFDR at 5kHz - ideal for precision industrial data acquisition and portable medical instrumentation.
For engineers reviewing the MAX1135BEAP datasheet, MAX1135BEAP pinout, MAX1135BEAP application, or MAX1135BEAP equivalent, this page provides verified technical context, validated pin functions, confirmed dynamic performance specs, real-world use-value in signal chain design, and two rigorously cross-checked alternative parts for system-level trade-off analysis.
Technical Context
The MAX1135BEAP implements a capacitive DAC-based SAR architecture with integrated input scaler and on-demand software calibration for offset, gain, INL, and DNL correction. Its analog front-end supports ±2.048V bipolar or 0–+2.048V unipolar full-scale ranges via programmable UNI/BIP bit, and features ±16.5V fault protection on AIN.
It operates in three clock modes: external clock (24 or 32 cycles/conversion), internal clock (self-timed conversion with SSTRB strobe), and software power-down. The three user-programmable outputs (P0–P2) are push-pull CMOS pins updated synchronously with control byte writes, enabling direct control of external multiplexers or PGAs without glue logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits, guaranteed no missing codes - ensures monotonicity and full code coverage across full temperature range. |
| Sampling Rate | 150 ksps (bipolar mode, 24-clock external mode) - enables real-time capture of signals up to ~75 kHz Nyquist bandwidth. |
| THD | −100 dB (typ, 5 kHz input) - minimizes harmonic distortion in high-fidelity sensor and instrumentation signal chains. |
| INL | ±2.5 LSB (max, −40°C to +85°C) - supports <12-bit effective resolution without calibration; <1 LSB typical enables high-accuracy closed-loop control. |
| Analog Supply | 3.135 V to 3.465 V single rail - simplifies power design by eliminating dual-supply requirements for true bipolar input operation. |
| Input Range | ±2.048 V or 0 to +2.048 V (software-selectable) - matches standard reference voltages and eliminates external level-shifting for 2.048V-referenced systems. |
| Shutdown Current | 1.2 µA (typ) - extends battery life in portable equipment during idle periods without compromising wake-up latency. |
Pinout & Package
MAX1135BEAP is housed in a 20-pin SSOP package (0.154" wide, 0.025" pitch), rated for −40°C to +85°C operation. Pin functions are validated per Maxim's official datasheet Rev 0 (April 2002).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Input | Accepts 2.048V external reference; requires 4.7µF bypass to AGND - sets full-scale range and directly impacts gain accuracy and drift. |
| 6 (SHDN) | Hardware Shutdown Control | Active-low input; pulls supply current to 1.2µA - enables rapid low-power state entry independent of software control. |
| 10 (SSTRB) | Serial Strobe Output | Indicates conversion start/end: low pulse in external clock mode; active-low latch in internal clock mode - synchronizes DSP or FPGA read timing without polling. |
| 11 (DOUT) | Serial Data Output | MSB-first, two's complement (bipolar) or straight binary (unipolar); updated on SCLK falling edge - compatible with TMS320 family and standard SPI controllers. |
| 13 (SCLK) | Serial Clock Input | Drives data transfer and (in external mode) ADC conversion steps; supports up to 3.6 MHz - determines maximum sample rate and noise immunity via duty cycle control. |
| 17 (CS) | Chip Select | Active-low enable for serial interface; places DOUT and SSTRB in high-impedance state when high - allows multi-device SPI bus sharing. |
| 7–9 (P2, P1, P0) | User-Programmable Outputs | Push-pull CMOS outputs controlled by control byte LSBs - directly drive 8-channel analog muxes or PGA gain-setting pins without external drivers. |
Key Features
| Feature | Design Value |
|---|---|
| On-demand software calibration | Corrects offset, gain, INL, and DNL in-system; initiated via M1=0/M0=1 control byte - eliminates factory calibration dependency and compensates for thermal drift. |
| Input scaler network | Maps ±2.048V external input to internal ADC core using resistor network (R2=2.5kΩ, R3=∞) - enables true bipolar measurement from single 3.3V supply without external op-amps. |
| Three programmable logic outputs | P0–P2 updated atomically with control byte write - provides deterministic, glitch-free control of external signal conditioning hardware synchronized to conversion setup. |
| SPI/QSPI/MICROWIRE/TMS320 compatibility | Supports 24- or 32-clock conversion frames, MSB-first, no external framing logic required - reduces firmware overhead and PCB footprint in microcontroller-based DAQ systems. |
| ±16.5V input fault protection | Active even during shutdown or AVDD=0 - protects downstream circuitry from overvoltage transients without external TVS diodes or series resistors. |
Applications
| Industrial Process Monitoring | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: High-accuracy voltage measurement from strain gauges, RTDs, or thermocouples in PLC I/O modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Primary analog-to-digital converter with integrated track/hold and reference buffer - digitizes conditioned sensor outputs at 150ksps with <±2.5 LSB INL over −40°C to +85°C. Use Value: Eliminates need for external precision op-amps and reference buffers; ±2.048V input range matches common isolated voltage references, reducing BOM count by 3–4 components. |
Use Scenario: Battery-powered ECG or EEG front-end acquiring low-amplitude bio-signals with minimal noise and DC offset. IC Role / Device Role / Timing Role: Low-power, high-SFDR ADC capturing differential biopotential waveforms - uses internal clock mode to decouple conversion timing from processor load. Use Value: 1.2µA shutdown current extends device runtime; −100dB THD preserves waveform fidelity; programmable P0–P2 pins select electrode configurations without added logic ICs. |
| Data-Acquisition Systems | Test & Measurement Equipment |
|
Use Scenario: Modular DAQ card for lab-grade oscilloscopes or spectrum analyzers requiring 16-bit resolution and >90dB SFDR. IC Role / Device Role / Timing Role: Precision sampling node with SSTRB strobe output - triggers FPGA-based memory capture aligned to conversion completion. Use Value: 92dB SFDR at 5kHz and 97dB at 75kHz enables clean spectral analysis; 20-pin SSOP footprint allows dense channel packing on multilayer PCBs. |
Use Scenario: Calibration-grade benchtop multimeter measuring DC voltage with 16-bit linearity and traceable accuracy. IC Role / Device Role / Timing Role: Metrology-grade ADC with on-demand calibration - performs self-correction before each measurement sweep to null thermal drift. Use Value: ±2.5 LSB INL max (−40°C to +85°C) meets Class I DMM specifications; software calibration eliminates manual trim pots and reduces production test time. |
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, 1MSPS, SPI interface, 2.5V supply only, no internal scaler, requires external reference buffer. | Higher speed but lacks ±2.048V bipolar input support and fault protection - needs external level-shifting and protection circuitry for same input range. | Choose for higher throughput where input scaling and robustness are handled externally; not drop-in due to supply and interface voltage mismatch. |
| AD7682BRMZ | 16-bit, 250ksps, pseudo-differential input, 5V supply, integrated reference (4.096V), no programmable outputs. | Includes internal reference but fixed 4.096V range - cannot natively support ±2.048V bipolar without external attenuation; no P0–P2 control pins. | Prefer when reference integration outweighs need for programmable I/O; requires redesign of reference path and signal conditioning for MAX1135BEAP's input range. |
Compared with ADS8860IDRCT and AD7682BRMZ, the MAX1135BEAP uniquely combines ±2.048V bipolar input scaling, 3.3V single-supply operation, three programmable outputs, and ±16.5V fault tolerance - making it optimal for space-constrained, robust industrial DAQ where system-level component count and reliability are critical.
Availability
MAX1135BEAP is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical instrumentation, data-acquisition systems, test & measurement equipment, and battery-powered sensor nodes requiring stable component supply across extended temperature ranges.
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 precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX1135BEAP belongs to Maxim's high-accuracy SAR ADC product line, engineered specifically for applications requiring true bipolar input capability, low power, and system-level integration - such as modular DAQ, portable diagnostics, and ruggedized control systems.
FAQ
What is the maximum analog input voltage the MAX1135BEAP can safely handle?
The MAX1135BEAP features ±16.5V absolute maximum rating on the AIN pin, with active overvoltage protection that functions even when AVDD = 0 or the device is in shutdown mode. This allows direct connection to industrial sensors or transducers with transient voltage spikes without external clamping components - a key reliability advantage confirmed in the Absolute Maximum Ratings table of the official datasheet.
Does the MAX1135BEAP require an external reference voltage?
Yes, the MAX1135BEAP requires a precise 2.048V external reference applied to the REF pin, bypassed with a 4.7µF capacitor to AGND. The device does not include an internal reference; its full-scale range scales linearly with REF voltage, so deviation from 2.048V directly impacts gain accuracy and must be accounted for in system calibration - as specified in Electrical Characteristics Note 7.
How does the MAX1135BEAP achieve bipolar input operation from a single 3.3V supply?
The MAX1135BEAP uses an integrated resistor-scaler network (R2 = 2.5kΩ, R3 = open) to attenuate and level-shift ±2.048V inputs into the internal ADC's 0–2.048V unipolar range. This allows true bipolar measurement without external op-amps or dual supplies - a function explicitly detailed in the "Input Scaler" section and Figure 1 of the MAX1134/MAX1135 datasheet.
Can the MAX1135BEAP's P0, P1, and P2 outputs drive a multiplexer directly?
Yes, the MAX1135BEAP's P0, P1, and P2 pins are push-pull CMOS outputs capable of directly controlling standard 8-channel analog multiplexers (e.g., ADG708). Each pin sources/sinks ≥1mA, and their states update synchronously with control byte writes - eliminating need for external level shifters or latches, as confirmed in the "User-Programmable Outputs" section and Table 2.
What is the minimum acquisition time required for accurate 16-bit conversions on the MAX1135BEAP?
In bipolar mode, the MAX1135BEAP requires a minimum acquisition time of 1.39µs (long acquisition mode) or 1.67µs (short acquisition mode), depending on clock configuration. This value is derived from the 5- or 13-clock-cycle requirement specified in Note 5 of the Electrical Characteristics table and validated in Figures 2 and 3 of the datasheet - critical for settling precision after input scaling.
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:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 150
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- MICROWIRE, QSPI, 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:
- True Bipolar
- 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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