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Analog Devices Inc./Maxim Integrated MAX149BCAP+T
- Part No.:
- MAX149BCAP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX149BCAP+T.pdf
- Description:
- IC ADC 10BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,042
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Product details
Overview
MAX149BCAP+T from Maxim Integrated is a 10-bit, 8-channel serial analog-to-digital converter (ADC) with integrated track/hold, software-configurable unipolar/bipolar and single-ended/differential inputs, internal 2.5V reference, and SPI/QSPI/MICROWIRE-compatible 4-wire interface. It operates from +2.7V to +5.25V, achieves 133ksps sampling rate, and draws only 1.2mA at 3V - enabling portable data logging and battery-powered medical instrumentation.
For engineers reviewing the MAX149BCAP+T datasheet, MAX149BCAP+T pinout, MAX149BCAP+T application, or MAX149BCAP+T equivalent, this page delivers verified electrical specs, package mapping, real-world use scenarios, and two confirmed alternative parts - all grounded in the official MAX148/MAX149 datasheet Rev 5 (Jan 2012) and Maxim's product documentation.
Technical Context
The MAX149BCAP+T implements successive-approximation (SAR) architecture with an internal track/hold circuit that acquires input signals in ≤1.5μs and supports both internal clock (1.8MHz typical) and external clock (up to 2.0MHz) conversion modes. Its analog front-end allows flexible configuration: 8 single-ended or 4 pseudo-differential input pairs (CH0/CH1 through CH6/CH7), with COM pin serving as common-mode reference.
Digital interfacing uses a 4-wire serial protocol where SCLK controls data transfer timing, DIN accepts 8-bit control bytes defining channel, polarity, and power mode, DOUT outputs 10-bit results MSB-first on SCLK falling edges, and SSTRB provides strobe synchronization - directly compatible with TMS320 DSPs and requiring no external logic for SPI/QSPI/MICROWIRE hosts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for precise digitization of analog sensor or signal sources. |
| Sampling Rate | 133ksps - supports real-time acquisition of audio-band and industrial control signals without undersampling artifacts. |
| INL (Integral Nonlinearity) | ±1 LSB (MAX149B grade) - ensures monotonicity and <0.1% full-scale error after calibration, critical for closed-loop feedback accuracy. |
| Supply Current | 1.2mA at 133ksps / 3V - enables >100-hour operation on a 120mAh coin cell in continuous-sampling portable instruments. |
| Reference | Internal 2.500V ±0.030V (±30ppm/°C) - eliminates external reference component cost and layout area while maintaining ±0.5% voltage stability over temperature. |
| Input Range | Unipolar: 0 to VREF; Bipolar: ±VREF/2 - supports direct connection to transducer bridges, op-amp outputs, and bipolar sensor interfaces without level-shifting circuitry. |
| Serial Interface | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire - integrates seamlessly with ARM Cortex-M, Renesas RL78, and TI C2000 microcontrollers using standard peripheral drivers. |
Pinout & Package
MAX149BCAP+T is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch, JEDEC MO-153 compliant, RoHS-compliant and lead(Pb)-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Support 8 single-ended or 4 differential (CH0/CH1, CH2/CH3, etc.) acquisitions; input capacitance 16pF limits source impedance to ≤4kΩ for full AC performance. |
| COM (Pin 9) | Analog ground reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB - requires low-noise AGND plane and local 0.1µF bypass. |
| SHDN (Pin 10) | Three-level shutdown control | Pull low → full power-down (1µA); leave floating → external compensation mode; pull high → internal compensation mode for VREF stability. |
| VREF (Pin 11) | Reference buffer output / ADC reference input | Delivers 2.500V ±0.030V (MAX149 only); requires 4.7µF capacitor for internal compensation; disables when REFADJ tied to VDD (MAX148 mode). |
| REFADJ (Pin 12) | Reference buffer adjustment input | Enables ±1.5% fine-tuning of VREF; tie to VDD to disable internal buffer - mandatory for external reference operation. |
| AGND / DGND (Pins 13–14) | Analog and digital ground returns | Must be separated at PCB level and joined at single point near VDD decoupling; AGND-DGND voltage difference limited to ±0.3V per absolute max ratings. |
| DOUT / SSTRB / DIN / CS / SCLK (Pins 15–19) | Digital serial interface | Full-duplex 4-wire SPI-compatible interface; DOUT active-low SSTRB synchronizes conversion completion; CS enables three-state outputs during idle. |
| VDD (Pin 20) | Positive supply | Accepts +2.7V to +5.25V; requires 0.1µF ceramic + 4.7µF tantalum bypass between VDD and DGND; PSR ±0.3mV ensures immunity to supply ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Single-ended (8 ch) or pseudo-differential (4 ch) selection via 3-bit channel code and SGL/DIF bit - eliminates hardware jumpers and enables runtime reconfiguration. |
| Auto power-down after conversion | Programmable shutdown via PD0/PD1 bits; device powers up automatically on CS assertion - reduces average current to <60µA at 1ksps sampling. |
| Internal reference with adjustable output | 2.500V ±0.030V reference with ±1.5% trim range at REFADJ - removes need for external precision reference and saves BOM cost and board space. |
| Low-noise track/hold acquisition | 1.5μs acquisition time with 2.25MHz small-signal bandwidth - captures fast transients and supports undersampling of RF signals up to Nyquist limit. |
| Flexible clocking architecture | Supports internal clock (no host timing dependency) or external clock (synchronized to processor bus) - simplifies firmware design and improves system-level jitter tolerance. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and CO₂ every 10 seconds using ultra-low-quiescent LDO and sleep-mode MCU. IC Role / Device Role / Timing Role: ADC front-end digitizing conditioned analog outputs from analog sensor ICs; internal reference ensures consistent scaling across varying battery voltage (2.8V–4.2V). Use Value: 1.2mA active current and 1µA shutdown enable >2-year operation on 2×AA alkaline cells; SSOP package fits compact 2-layer PCB. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential signals at 1ksps with real-time QRS detection and Bluetooth LE telemetry. IC Role / Device Role / Timing Role: Pseudo-differential ADC sampling CH0/CH1 pair; COM referenced to right-leg drive amplifier output for common-mode rejection. Use Value: ±1 LSB INL and 66dB SINAD meet AAMI EC11 clinical accuracy requirements; SPI interface enables deterministic 100µs readout latency. |
| Battery-Powered Test Equipment | Industrial Process Control |
|
Use Scenario: Pocket-sized multimeter with auto-ranging, true-RMS calculation, and Li-ion rechargeable battery. IC Role / Device Role / Timing Role: Configurable unipolar/bipolar input handling AC/DC voltage, current shunt, and thermocouple signals; internal 2.5V reference stabilizes gain calibration. Use Value: Software-selectable input range eliminates external PGA switching; 133ksps supports 50/60Hz harmonic analysis up to 5th order. |
Use Scenario: DIN-rail mounted PLC analog input module converting 4–20mA loop signals and thermistor readings for HVAC zone control. IC Role / Device Role / Timing Role: 8-channel multiplexer scanning multiple field sensors; robust ESD protection (±2kV HBM) withstands industrial wiring noise. Use Value: Channel-to-channel crosstalk <−75dB prevents interference between adjacent 4–20mA inputs; SSOP package supports automated SMT assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-channel, 12-bit, SPI interface, no internal reference, 2.7V–5.25V supply, 200ksps max | Higher resolution but requires external 2.5V reference and lacks bipolar input support | Choose when 12-bit precision is mandatory and board space allows extra reference IC; not drop-in due to different control byte format and missing SHDN pin. |
| MAX11131AUT+T | 8-channel, 12-bit, internal 2.048V reference, SPI, 2.7V–3.6V supply, 500ksps, 20-pin TSSOP | Narrower supply range, higher speed, smaller reference voltage, different pinout (no SSTRB, different CS/DIN placement) | Prefer for 3.3V-only systems needing faster throughput; incompatible pinout and missing SSTRB require PCB redesign and firmware adaptation. |
Compared with ADS7822U and MAX11131AUT+T, the MAX149BCAP+T uniquely combines internal 2.5V reference, bipolar input capability, SSTRB synchronization, and full 2.7V–5.25V operation in a pinout-verified 20-pin SSOP - making it optimal for legacy-compatible upgrades and mixed-voltage portable designs.
Availability
MAX149BCAP+T is available at Aetrix Electronics and suitable for portable data logging, battery-powered medical instrumentation, and industrial process control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX149BCAP+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications markets.
The MAX148/MAX149 family was designed specifically for low-power, multi-channel data acquisition in space-constrained, battery-operated systems - emphasizing integration (MUX + T/H + ref + interface), software configurability, and wide supply voltage tolerance.
FAQ
What is the guaranteed integral nonlinearity (INL) specification for MAX149BCAP+T?
The MAX149BCAP+T is specified as a "MAX149B" grade device, with guaranteed INL of ±1 LSB over the full operating temperature range (0°C to +70°C). This value is explicitly listed in the Ordering Information table on page 1 of the datasheet and confirmed in the Electrical Characteristics table under "Relative Accuracy (INL)" for MAX14_B grade. The ±1 LSB limit ensures monotonic behavior and supports accurate calibration in precision measurement systems using the MAX149BCAP+T.
Does MAX149BCAP+T include an internal voltage reference, and can it be adjusted?
Yes, the MAX149BCAP+T includes a factory-trimmed internal 2.500V reference with ±30ppm/°C temperature coefficient and ±1.5% adjustment range via the REFADJ pin. As stated in the General Description and Electrical Characteristics sections, the MAX149 variant (unlike MAX148) integrates this reference buffer, and the REFADJ pin allows fine-tuning - for example, calibrating out system-level gain errors. This functionality is fully supported in the MAX149BCAP+T and documented in the "INTERNAL REFERENCE (MAX149 Only)" subsection.
What package type and footprint does MAX149BCAP+T use?
The MAX149BCAP+T uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, as confirmed by the "Ordering Information" table (row: MAX149BCAP+) and Pin Configuration diagram. The "+T" suffix denotes tape-and-reel packaging, while "+" indicates RoHS-compliance. This SSOP package is pin-compatible with the PDIP version (MAX149BCPP+) but requires different PCB land patterns and reflow profiles - verified in Maxim's packaging documentation and JEDEC MO-153 standard.
How does the shutdown function work on MAX149BCAP+T, and what is its lowest current draw?
The MAX149BCAP+T features a three-level SHDN pin (Pin 10): pulled low → full power-down (1µA typical at 3V); left floating → external compensation mode; pulled high → internal compensation mode. In full power-down, supply current drops to 1µA (not 60µA), as specified in the "POWER REQUIREMENTS" table under "Full power-down" for VDD = 3.6V. This ultra-low state retains no register state and requires reinitialization upon wake-up - a key design consideration when implementing sleep/wake cycles with the MAX149BCAP+T.
Is MAX149BCAP+T compatible with standard SPI interfaces, and what configuration is required?
Yes, the MAX149BCAP+T is SPI/QSPI/MICROWIRE-compatible using a 4-wire interface (CS, SCLK, DIN, DOUT) with CPOL = 0 and CPHA = 0. As detailed in the "Digital Interface" section and Table 1, it accepts an 8-bit control byte to configure channel, polarity, and clock mode, then outputs 10-bit results MSB-first on SCLK falling edges. No level shifters or glue logic are needed - confirmed by the Typical Operating Circuit (Figure 5) and timing diagrams (Figures 6–10) in the MAX148/MAX149 datasheet.
MAX149BCAP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 133k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX149BCAP+T FAQ
1.How can I place an order for MAX149BCAP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX149BCAP+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 MAX149BCAP+T reliable?
The price and inventory of MAX149BCAP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX149BCAP+T is usually 5 days.
3.What payment methods are accepted for MAX149BCAP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX149BCAP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX149BCAP+T?
MAX149BCAP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX149BCAP+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 MAX149BCAP+T?
For technical support, including MAX149BCAP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX149BCAP+T requirements.
6.How does Aetrix verify that MAX149BCAP+T is sourced from the original manufacturer or authorized distributors?
All MAX149BCAP+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 MAX149BCAP+T meets industry standards.
7.What is the process for return or replacement of MAX149BCAP+T?
All MAX149BCAP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX149BCAP+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 MAX149BCAP+T part is unused and in its original packaging.
Return procedure for MAX149BCAP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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