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Analog Devices Inc./Maxim Integrated MAX1229BEEP+T
- Part No.:
- MAX1229BEEP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1229BEEP+T.pdf
- Description:
- IC ADC 12BIT SAR 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,318
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Product details
Overview
MAX1229BEEP+T from Maxim Integrated is a 12-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor (±1.2°C error over –40°C to +85°C), 16-entry FIFO, internal 2.5V reference, and SPI/QSPI/MICROWIRE-compatible 3-wire interface. It supports 12 single-ended or 6 true differential input channels, operates from a single +3V supply, and targets precision system supervision and industrial data acquisition.
For engineers reviewing the MAX1229BEEP+T datasheet, MAX1229BEEP+T pinout, MAX1229BEEP+T application, or MAX1229BEEP+T equivalent, this page delivers verified technical context, exact pin functions for the 20-pin QSOP package, real-world use cases in patient monitoring and instrumentation, and two validated alternative ADCs with documented functional and packaging differences.
Technical Context
The MAX1229BEEP+T employs a fully differential successive-approximation register (SAR) architecture with on-chip track-and-hold, supporting both unipolar (0 to VREF) and bipolar (±VREF/2) differential modes. Its internal oscillator enables autonomous scan mode operation without external timing control.
It integrates a dedicated temperature-sensing path using the internal reference, delivering 1/8°C resolution in two's complement format. The 16-deep FIFO buffers conversion results and temperature readings independently, allowing burst acquisition without serial bus contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity voltage and temperature digitization. |
| Max Sampling Rate | 300ksps - supports real-time capture of fast transients up to 100kHz full-linear bandwidth. |
| INL / DNL | ±1 LSB - ensures monotonicity and no missing codes across –40°C to +85°C, critical for closed-loop control. |
| Temp Sensor Accuracy | ±1.2°C over full range - enables reliable board-level thermal monitoring without external calibration. |
| SPI Interface Speed | 10MHz - allows rapid readout of FIFO contents with minimal CPU overhead in microcontroller systems. |
| Supply Current | 1.05–1.2mA at 300ksps - enables low-power operation in battery-backed data loggers and portable instruments. |
| Reference Voltage | 2.48–2.52V internal - provides stable scaling for measurements independent of VDD variation (±30ppm/°C TC). |
Pinout & Package
MAX1229BEEP+T is packaged in a 20-pin QSOP (0.154" wide), RoHS-compliant and lead-free. Pin functions are electrically validated per Maxim's official datasheet Rev 7 (April 2012).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | EOC | Active-low end-of-conversion flag - signals completion of last requested conversion; used for interrupt-driven data reads. |
| 2 | DOUT | Serial data output - delivers 16-bit results MSB-first on falling SCLK edge; tri-stated when CS = VDD. |
| 3 | DIN | Serial data input - accepts 8-bit setup bytes and register writes on rising SCLK edge. |
| 4 | CS | Active-low chip select - enables serial interface and controls DOUT tri-state; must be held low during full byte transfer. |
| 5–14 | AIN0–AIN9 | Analog input channels - configurable as 12 single-ended or 6 true differential pairs (e.g., AIN0/AIN1); support unipolar/bipolar modes. |
| 15 | REF-/AIN10 | Negative reference input or analog channel 10 - selects external differential reference when configured; disables AIN10 if used as REF-. |
| 16 | CNVST/AIN11 | Active-low conversion start or analog channel 11 - initiates conversions in clock modes 00/01; excludes AIN11 when used as CNVST. |
| 17 | REF+ | Positive reference input - accepts internal 2.5V ref or external reference; requires 0.1µF bypass to GND. |
| 18 | GND | Analog/digital ground - common return for reference, analog inputs, and digital I/O; must be low-impedance. |
| 19 | VDD | +3V power supply - operates from 2.7V to 3.6V; requires local 0.1µF ceramic decoupling. |
| 20 | SCLK | Serial clock input - drives data transfer at ≤10MHz; 40–60% duty cycle required; supports CPOL/CPHA = 0 or 1. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 16-entry FIFO | Enables autonomous multi-channel scanning and temperature measurement without CPU polling or bus blocking. |
| Internal temperature sensor | Delivers calibrated die temperature readings (±1.2°C) using internal reference-no external components needed. |
| True differential track-and-hold | Rejects common-mode noise on matched input pairs (e.g., AIN0/AIN1), preserving signal integrity in noisy industrial environments. |
| AutoShutdown™ mode | Reduces supply current to ≤5µA during idle periods-extends battery life in portable data loggers and remote sensors. |
| Configurable clock modes | Four CKSEL options (00–11) support software-triggered, hardware-triggered, internally timed, or externally clocked conversions. |
Applications
| System Supervision | Patient Monitoring |
|---|---|
Use Scenario: Real-time voltage, current, and temperature monitoring of power rails and thermal zones in embedded controllers. IC Role / Device Role / Timing Role: Primary ADC for multi-point analog sensing with autonomous FIFO buffering and on-demand temperature reads. Use Value: Eliminates need for external multiplexer and reference IC, reducing BOM count and layout area by >30%. |
Use Scenario: Acquisition of biopotential signals (ECG, EMG) and ambient/skin temperature in portable medical devices. IC Role / Device Role / Timing Role: Simultaneous sampling of differential biosignals and local temperature for drift compensation. Use Value: Bipolar differential mode rejects 50/60Hz mains interference; internal temp sensor enables real-time gain/offset correction. |
| Data Logging | Industrial Control Systems |
Use Scenario: Battery-powered environmental sensor nodes logging temperature, humidity (via bridge), and supply voltage over weeks. IC Role / Device Role / Timing Role: Low-power ADC with AutoShutdown and internal reference-enables long-term unattended operation. Use Value: 1.05mA active current and µA-level shutdown extend coin-cell lifetime beyond 2 years at 10s sampling intervals. |
Use Scenario: Analog feedback acquisition in PLC I/O modules measuring 4–20mA loop signals, thermocouples, and RTDs. IC Role / Device Role / Timing Role: High-accuracy front-end ADC with ±1 LSB linearity and robust ESD-protected inputs. Use Value: Internal 2.5V reference stability (±30ppm/°C) maintains calibration across industrial temperature ranges without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit, 200ksps, no internal reference or temperature sensor; SPI-only interface; SOIC-8 package. | Lacks FIFO, temp sensing, and differential input support-suitable only for basic single-channel voltage monitoring. | Select when cost and footprint are primary constraints and advanced features are unnecessary. |
| AD7490BRUZ | 12-bit, 1MSPS, 16-channel, no internal temp sensor; uses external reference; TSSOP-28 package. | Higher speed but requires external reference and lacks integrated thermal monitoring-adds design complexity. | Choose for high-throughput applications where temperature sensing is handled separately. |
Compared with MAX1229BEEP+T, ADS7822U trades resolution, integration, and functionality for lower cost and size, while AD7490BRUZ offers higher speed at the expense of added external components and no on-die temperature capability-making MAX1229BEEP+T optimal for compact, self-contained sensing nodes.
Availability
MAX1229BEEP+T is available at Aetrix Electronics and suitable for system supervision, patient monitoring, and industrial control applications requiring stable component supply, extended temperature qualification (–40°C to +85°C), and RoHS-compliant packaging.
Supply support for MAX1229BEEP+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 demanding industrial, medical, and communications applications.
The MAX1227/MAX1229/MAX1231 product line was engineered to deliver highly integrated, low-power, multichannel data acquisition in minimal footprint-targeting space-constrained, battery-operated, and thermally aware systems.
FAQ
What is the operating temperature range of the MAX1229BEEP+T?
The MAX1229BEEP+T is specified for continuous operation from –40°C to +85°C, matching its "E" grade designation. This extended range is validated across all electrical parameters including INL, DNL, reference stability, and temperature sensor accuracy-ensuring reliability in industrial and automotive-adjacent environments where MAX1229BEEP+T is deployed.
Does the MAX1229BEEP+T require an external reference voltage?
No, the MAX1229BEEP+T includes a factory-trimmed 2.48–2.52V internal reference with ±30ppm/°C temperature coefficient, eliminating the need for external reference components in most applications. An external differential reference can be applied via REF+ and REF– pins if higher precision or custom scaling is required-MAX1229BEEP+T supports both configurations seamlessly.
How many analog input channels does the MAX1229BEEP+T support?
The MAX1229BEEP+T supports 12 single-ended analog input channels (AIN0–AIN11) or 6 true differential pairs (e.g., AIN0/AIN1, AIN2/AIN3, etc.). Channel mapping and configuration are controlled via the setup and conversion registers-MAX1229BEEP+T's pinout and internal routing strictly limit usable channels to those defined in the official datasheet for the 20-pin QSOP variant.
Can the MAX1229BEEP+T perform simultaneous sampling of multiple channels?
No, the MAX1229BEEP+T uses a single SAR core with sequential sampling-it cannot acquire multiple channels simultaneously. However, its 300ksps maximum rate and 16-deep FIFO enable rapid pseudo-simultaneous acquisition across all 12 channels within ~40µs total scan time, minimizing inter-channel timing skew for coherent waveform reconstruction-this behavior is intrinsic to MAX1229BEEP+T's architecture.
What is the function of the EOC pin on the MAX1229BEEP+T?
The EOC (End of Conversion) pin on MAX1229BEEP+T is an active-low open-drain output that asserts low upon completion of each conversion or scan sequence. In clock modes 00 and 10, it signals readiness of the latest result in FIFO; in mode 01, it pulses low after every individual conversion. This pin enables interrupt-driven firmware handling-reducing polling overhead and ensuring deterministic timing in real-time MAX1229BEEP+T implementations.
MAX1229BEEP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 300k
- Number of Inputs:
- 6, 12
- 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 ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- Temperature Sensor
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1229BEEP+T FAQ
1.How can I place an order for MAX1229BEEP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1229BEEP+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 MAX1229BEEP+T reliable?
The price and inventory of MAX1229BEEP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1229BEEP+T is usually 5 days.
3.What payment methods are accepted for MAX1229BEEP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1229BEEP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1229BEEP+T?
MAX1229BEEP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1229BEEP+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 MAX1229BEEP+T?
For technical support, including MAX1229BEEP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1229BEEP+T requirements.
6.How does Aetrix verify that MAX1229BEEP+T is sourced from the original manufacturer or authorized distributors?
All MAX1229BEEP+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 MAX1229BEEP+T meets industry standards.
7.What is the process for return or replacement of MAX1229BEEP+T?
All MAX1229BEEP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1229BEEP+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 MAX1229BEEP+T part is unused and in its original packaging.
Return procedure for MAX1229BEEP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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