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Analog Devices Inc./Maxim Integrated MAX1144BCAP
- Part No.:
- MAX1144BCAP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1144BCAP.pdf
- Description:
- 14-BIT ADC, 150KSPS
- Quantity:
- Payment:
- Shipping:
Inventory:1,926
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Product details
Overview
MAX1144BCAP from Maxim Integrated is a 14-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, delivers ±2 LSB INL over 0°C to +70°C, and supports ±6V or 0–+6V analog inputs. Used in industrial I/O modules for high-accuracy sensor digitization under noisy plant-floor conditions.
For engineers reviewing the MAX1144BCAP datasheet, MAX1144BCAP pinout, MAX1144BCAP application, or MAX1144BCAP equivalent, this page provides verified technical context, real-world timing behavior, calibrated DC accuracy specs, and validated alternative options for precision data-acquisition systems requiring stable 14-bit resolution at 150ksps.
Technical Context
The MAX1144BCAP implements a capacitor-based SAR architecture with integrated input scaler and on-demand calibration circuitry. Its analog front-end includes fault-protected input network (±16.5V rating), programmable unipolar/bipolar mode selection via control byte bit 6, and software-configurable acquisition modes (24- or 32-clock cycles).
It supports three clocking configurations: internal clock (freeing MCU resources), external clock (synchronous to host processor), and mixed-mode operation where SSTRB signals conversion start/end. Digital outputs (P0–P2) are push-pull CMOS, updated atomically with each control byte write and retained during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14 bits - guarantees no missing codes across full operating range |
| Sampling Rate | 150 ksps in bipolar mode - enables real-time capture of 75 kHz sine-wave inputs with ≥92 dB SFDR |
| INL | ±2 LSB (max) - ensures monotonicity and <0.012% full-scale linearity error at 0°C to +70°C |
| THD | −100 dB (typ) at 5 kHz - supports high-fidelity signal reconstruction in medical instrumentation |
| Supply Current | 8.4 mA (typ, bipolar mode) - compatible with low-power industrial sensors and battery-backed DAQ |
| Shutdown Current | 1.2 µA - allows rapid power gating between measurement bursts without losing configuration state |
| Input Range | ±6 V or 0 to +6 V - accommodates standard industrial transducer outputs without external level-shifting |
| Reference Input | 2.048 V external reference - enables precise full-scale mapping and compatibility with common voltage references |
Pinout & Package
MAX1144BCAP is housed in a 20-pin SSOP package (0.209" body width, 0.025" pitch), rated for operation from 0°C to +70°C, with exposed pad not present and moisture sensitivity level (MSL) 1 per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Input | Accepts 2.048 V external reference; requires 4.7 µF bypass to AGND for noise immunity and stability |
| 6 (SHDN) | Hardware Shutdown Control | Active-low input; forces 1.2 µA standby current and preserves register state during sleep |
| 10 (SSTRB) | Serial Strobe Output | Signals conversion start/end: low pulse in internal clock mode; one-cycle high pulse in external clock mode |
| 11 (DOUT) | Serial Data Output | MSB-first output; two's complement for bipolar, straight binary for unipolar; high-impedance when CS = high |
| 13 (SCLK) | Serial Clock Input | Drives data transfer and ADC conversion steps in external clock mode; max 3.6 MHz for 150 ksps operation |
| 17 (CS) | Chip Select | Active-low enable for serial interface; disables DOUT/SSTRB when high; supports multi-device SPI bus sharing |
| 7–9 (P2, P1, P0) | User-Programmable Outputs | Push-pull CMOS outputs controlled by control byte LSBs; used for multiplexer/PGA address control without GPIO overhead |
Key Features
| Feature | Design Value |
|---|---|
| On-demand calibration | Corrects offset, gain, INL, and DNL errors via software command; required after >10°C ambient shift or supply/reference change |
| Input scaler network | Maps ±6 V or 0–+6 V inputs to internal ADC range using resistor network; provides ±16.5 V fault protection even in shutdown |
| Three acquisition modes | 24-clock (short), 32-clock (long), and internal clock modes - trade off speed vs. settling time for varying source impedances |
| SPI/QSPI/MICROWIRE compatibility | Direct connection to TMS320 DSPs and microcontrollers without glue logic; supports 4 MHz data readout in internal clock mode |
| Software-configurable polarity | UNI/BIP bit (bit 6) selects unipolar (0–+6 V) or bipolar (±6 V) mode dynamically during operation |
Applications
| Industrial Process Control | Medical Instrumentation |
|---|---|
Use Scenario: Digitizing 4–20 mA loop outputs from pressure/temperature transmitters in PLC analog input modules. IC Role / Device Role / Timing Role: Primary ADC performing synchronized sampling of multiple channels via external multiplexer controlled by P0–P2 outputs. Use Value: ±2 LSB INL and −100 dB THD ensure <0.01% measurement uncertainty across 0–100°C ambient range without recalibration. |
Use Scenario: Capturing ECG waveforms in portable patient monitors with battery life constraints. IC Role / Device Role / Timing Role: Low-power, high-SFDR ADC acquiring 1 kHz bandwidth signals at 150 ksps with on-demand calibration before each patient session. Use Value: 1.2 µA shutdown current extends battery runtime; internal track/hold eliminates need for external sample-hold circuitry. |
| Data-Acquisition Systems | Industrial I/O Modules |
Use Scenario: High-channel-count DAQ card for lab-grade spectral analysis of vibration signals. IC Role / Device Role / Timing Role: Precision ADC interfaced to FPGA via SPI, using SSTRB for deterministic trigger alignment and P0–P2 for channel selection. Use Value: 92 dB SFDR at 75 kHz input enables accurate FFT bin resolution for bearing fault detection up to 30 kHz. |
Use Scenario: DIN-rail mounted analog input module converting 0–10 V sensor outputs into Modbus RTU packets. IC Role / Device Role / Timing Role: Isolated front-end ADC with software-selectable input range, communicating via isolated SPI to ARM Cortex-M host. Use Value: Single 3.3 V supply simplifies isolated power design; ±6 V input tolerance accommodates field wiring transients without clamping diodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8325IPW | 16-bit resolution, 100 ksps, 2.7–5.5 V supply, no internal scaler; requires external op-amp for ±6 V inputs | Higher resolution but lower speed; lacks built-in input scaling and programmable outputs | Choose ADS8325IPW when 16-bit precision outweighs speed and system integration needs |
| AD7940BRMZ | 14-bit, 100 ksps, 2.7–5.25 V supply, SPI-only interface, no SSTRB or P0–P2 outputs | No hardware strobe or GPIO outputs; requires external logic for multiplexer control | Choose AD7940BRMZ when board space is constrained and external control logic is already present |
Compared with MAX1144BCAP, ADS8325IPW offers higher resolution but sacrifices speed and integrated analog front-end features, while AD7940BRMZ reduces feature set to minimize footprint-neither provides the same combination of 150 ksps throughput, ±6 V input handling, and embedded control outputs.
Availability
MAX1144BCAP is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and data-acquisition systems requiring stable component supply with guaranteed 0°C to +70°C performance and long-term traceability.
Supply support for MAX1144BCAP 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 and mixed-signal ICs for demanding industrial, medical, and communications applications.
The MAX1144BCAP belongs to Maxim's high-speed precision SAR ADC product line, engineered for applications needing calibrated 14-bit accuracy, flexible input scaling, and minimal external components in space-constrained systems.
FAQ
What is the maximum sampling rate of the MAX1144BCAP in bipolar mode?
The MAX1144BCAP achieves a maximum sampling rate of 150 ksps in bipolar mode when using external clocking with 24 clock cycles per conversion and fSCLK = 3.6 MHz. This is confirmed in the Electrical Characteristics table under "Sample Rate" with conditions: bipolar mode, external clock, 24 clocks/conversion. The MAX1144BCAP maintains full 14-bit performance-including ±2 LSB INL and −100 dB THD-at this rate.
Does the MAX1144BCAP require an external reference voltage?
Yes, the MAX1144BCAP requires an external 2.048 V reference connected to the REF pin. The datasheet specifies that REF must be bypassed with a 4.7 µF capacitor to AGND, and the reference must deliver up to 150 µA DC load current with ≤10 Ω output impedance. The MAX1144BCAP does not include an internal reference; its full-scale range scales linearly with the applied reference voltage.
How does the MAX1144BCAP handle input overvoltage conditions?
The MAX1144BCAP incorporates an input protection network that limits fault current to <2 mA for analog inputs up to ±16.5 V relative to AGND-even when AVDD = 0 or the device is in shutdown mode. This protection is implemented via internal resistors (R1 = 2.5 kΩ, R2 = 7.6 kΩ for MAX1144) and remains active independent of power state, enabling robust operation in industrial environments with cable-induced transients.
Can the MAX1144BCAP operate with a 5 V digital supply?
No, the MAX1144BCAP is specified only for 3.135 V to 3.465 V analog and digital supplies (3.3 V ±5%). The Absolute Maximum Ratings limit DVDD to +6 V, but electrical performance-including INL, THD, and supply current-is guaranteed only within the 3.135–3.465 V range. Operating outside this window may cause increased DNL, reduced SNR, or failure to meet the ±2 LSB INL specification of the MAX1144BCAP.
What is the function of the SSTRB pin on the MAX1144BCAP?
The SSTRB (Serial Strobe) pin on the MAX1144BCAP provides timing synchronization for host processors: in internal clock mode, it goes low at conversion start and high at completion (≤7 µs pulse width); in external clock mode, it pulses high for one SCLK period before MSB output. This allows deterministic triggering of data reads or external circuit actions-such as initiating a multiplexer switch-without polling or tight timing margins in the MAX1144BCAP interface.
MAX1144BCAP 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:
- 14
- 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:
- PGA, True Bipolar
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1144BCAP FAQ
1.How can I place an order for MAX1144BCAP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1144BCAP 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 MAX1144BCAP reliable?
The price and inventory of MAX1144BCAP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1144BCAP is usually 5 days.
3.What payment methods are accepted for MAX1144BCAP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1144BCAP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1144BCAP?
MAX1144BCAP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1144BCAP 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 MAX1144BCAP?
For technical support, including MAX1144BCAP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1144BCAP requirements.
6.How does Aetrix verify that MAX1144BCAP is sourced from the original manufacturer or authorized distributors?
All MAX1144BCAP 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 MAX1144BCAP meets industry standards.
7.What is the process for return or replacement of MAX1144BCAP?
All MAX1144BCAP units undergo pre-shipment inspection (PSI). If there is an issue with MAX1144BCAP, 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 MAX1144BCAP part is unused and in its original packaging.
Return procedure for MAX1144BCAP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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