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Analog Devices Inc./Maxim Integrated MAX1229BEEP+
- Part No.:
- MAX1229BEEP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1229BEEP+.pdf
- Description:
- IC ADC 12BIT SAR 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:123
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Product details
Overview
MAX1229BEEP+ 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), on-chip 16-entry FIFO, and internal 2.5V reference. It supports 12 single-ended or 6 true differential input channels, operates from a single +3V supply, and features SPI/QSPI/MICROWIRE-compatible 3-wire interface - used in industrial data-acquisition systems for multichannel voltage and temperature monitoring.
For engineers reviewing the MAX1229BEEP+ datasheet, MAX1229BEEP+ pinout, MAX1229BEEP+ application, or MAX1229BEEP+ equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and two validated alternative parts - all grounded in Maxim's official specifications for the -40°C to +85°C extended temperature grade QSOP variant.
Technical Context
The MAX1229BEEP+ implements a fully differential successive-approximation register (SAR) ADC architecture with integrated 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 same internal reference and conversion core, delivering results in two's complement format at 1/8°C resolution. The 16-deep FIFO buffers conversion results and temperature readings independently, enabling burst acquisition without serial bus contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output codes with no missing codes guaranteed over temperature. |
| Sampling Rate | 300ksps maximum - achievable only in externally clocked mode (CKSEL = 11) with SCLK ≤ 4.8MHz. |
| INL / DNL | ±1 LSB - ensures monotonicity and <0.025% full-scale linearity error for precision measurement systems. |
| Internal Reference | 2.50V ±10mV (±0.4%) - stable over temperature (±30ppm/°C), eliminating need for external reference in most applications. |
| Temperature Accuracy | ±1.2°C (–40°C to +85°C) - calibrated at production, usable for system-level thermal monitoring without external sensor. |
| Supply Current | 1.05–1.2mA at 300ksps (internal reference active) - enables low-power portable or battery-backed DAQ designs. |
| Digital Interface | 10MHz SPI/QSPI/MICROWIRE-compatible 3-wire - compatible with standard microcontroller peripherals without level-shifting. |
Pinout & Package
MAX1229BEEP+ is packaged in a 20-pin QSOP (0.154" wide), RoHS-compliant and lead-free. Pin 1 is marked by a beveled corner; exposed pad is not present (TQFN variants have EP, but MAX1229BEEP+ is QSOP-only).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN9 | Analog Input Channels | 12-channel capability: AIN0–AIN9 plus REF-/AIN10 and CNVST/AIN11 - configurable as single-ended or true differential pairs (e.g., AIN0/AIN1, AIN2/AIN3). |
| REF+/REF- | Reference Inputs | REF+ accepts 1.0V to VDD+50mV; REF- serves dual role as negative reference input or analog channel AIN10 - selected via setup register. |
| CNVST/AIN11 | Conversion Start / Analog Input | Active-low conversion trigger; when configured as AIN11, disables CNVST function - mutually exclusive per register configuration. |
| SCLK, DIN, DOUT, CS | Serial Interface Signals | Standard 3-wire SPI-compatible interface: CS enables slave select; data latched on SCLK rising edge (DIN), output on falling edge (DOUT). |
| EOC | End-of-Conversion Flag | Active-low open-drain output indicating valid data ready; behavior varies by clock mode (e.g., pulses per conversion in mode 01). |
| VDD, GND | Power Supply | +2.7V to +3.6V operation; requires local 0.1µF ceramic bypass at each supply pin per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 16-entry FIFO | Enables autonomous multi-channel scanning and temperature capture without CPU intervention - reduces host processor load in embedded DAQ. |
| Integrated temperature sensor | Delivers calibrated die temperature readings (±1.2°C) using same ADC core and reference - eliminates BOM cost and layout area of discrete sensor. |
| Configurable input topology | Supports 12 single-ended or 6 true differential channels with programmable unipolar/bipolar mode - adapts to diverse signal sources (4–20mA, thermocouples, bridge sensors). |
| AutoShutdown™ mode | Reduces supply current to <5µA during idle - extends battery life in portable instrumentation and remote monitoring nodes. |
| Internal 2.5V reference | Stable ±30ppm/°C drift and <200µVRMS noise - suitable for 12-bit accuracy without external reference component or compensation circuitry. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of pressure, flow, and temperature signals from multiple field transmitters in PLC-based control cabinets. IC Role / Device Role / Timing Role: Central multichannel ADC digitizing analog sensor outputs and onboard temperature for calibration compensation. Use Value: 12-bit resolution and ±1 LSB INL ensure <0.025% measurement fidelity across 12 channels; FIFO enables deterministic sampling without interrupt latency. |
Use Scenario: Compact bedside monitor acquiring ECG leads, respiration impedance, and skin temperature simultaneously. IC Role / Device Role / Timing Role: Low-power ADC handling analog front-end digitization while integrating patient temperature directly on-chip. Use Value: Single +3V supply and 1.2mA active current enable battery operation; internal temp sensor eliminates separate NTC placement and routing. |
| Data Logger with Environmental Sensing | Automated Test Equipment (ATE) Channel Expander |
Use Scenario: Battery-powered environmental node measuring ambient temperature, humidity (via analog output sensor), and light intensity over weeks. IC Role / Device Role / Timing Role: Primary ADC managing scheduled voltage conversions and periodic die temperature reads for self-calibration. Use Value: AutoShutdown™ cuts quiescent current to <5µA; internal reference stability removes drift-related recalibration needs in unattended deployments. |
Use Scenario: Modular ATE fixture adding 12-channel analog measurement capability to existing digital test controller via SPI interface. IC Role / Device Role / Timing Role: High-speed auxiliary ADC offloading analog acquisition from main controller during functional test sequences. Use Value: 300ksps rate with 10MHz SPI allows rapid channel cycling; scan mode and FIFO support burst acquisition of stimulus-response waveforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel, temperature-integrated ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953SRHBT | 12-bit, 1MSPS, 16-channel, SPI interface, no integrated temp sensor, requires external reference. | Better speed and channel count, but lacks on-die temperature sensing and internal reference - adds BOM and layout complexity. | Choose when sampling rate >300ksps is required and temperature monitoring is handled separately. |
| AD7927BRUZ | 12-bit, 500ksps, 8-channel, no FIFO, no temp sensor, internal reference, SPI interface. | Fewer channels (8 vs. 12), no FIFO or temperature sensor - simpler but less autonomous; lower integration for basic DAQ. | Choose for cost-sensitive, lower-channel-count systems where FIFO buffering and on-chip temp are not needed. |
Compared with ADS7953SRHBT and AD7927BRUZ, the MAX1229BEEP+ uniquely combines 12-channel flexibility, integrated temperature sensing, FIFO buffering, and internal reference in a single +3V QSOP package - reducing system-level design effort for embedded monitoring applications requiring autonomous multichannel acquisition.
Availability
MAX1229BEEP+ is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, environmental data logging, and automated test equipment requiring stable component supply across extended temperature ranges.
Supply support for MAX1229BEEP+ 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 precision measurement, power management, and interface applications.
The MAX1227/MAX1229/MAX1231 product line delivers integrated, low-power, multichannel ADCs with on-chip intelligence (FIFO, temp sensor, internal reference) specifically for embedded data-acquisition systems where size, power, and autonomy are critical.
FAQ
What is the operating temperature range for MAX1229BEEP+?
The MAX1229BEEP+ is specified for operation from –40°C to +85°C, matching the "E" grade in Maxim's ordering nomenclature. This extended industrial temperature range is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics sections of the official datasheet, and applies to all performance parameters including INL, DNL, reference stability, and temperature sensor accuracy.
Does MAX1229BEEP+ require an external reference voltage?
No, MAX1229BEEP+ does not require an external reference voltage - it includes a factory-trimmed 2.50V ±10mV internal reference with ±30ppm/°C temperature coefficient. An external differential reference can be used via REF+ and REF- pins, but the internal reference is enabled by default and sufficient for 12-bit accuracy in most applications.
How many analog input channels does MAX1229BEEP+ support?
MAX1229BEEP+ supports up to 12 single-ended analog input channels (AIN0–AIN9, REF-/AIN10, CNVST/AIN11) or 6 true differential pairs (e.g., AIN0/AIN1, AIN2/AIN3). This is explicitly defined in the General Description and Pin Description sections, and distinguishes it from the 8-channel MAX1227 and 16-channel MAX1231 in the same family.
What package type is used for MAX1229BEEP+?
MAX1229BEEP+ uses a 20-pin QSOP (Quad Small Outline Package) with 0.154" body width and standard gull-wing leads. The "+" suffix denotes RoHS-compliance and lead-free finish. Unlike the MAX1231, the MAX1229 is not offered in TQFN; all MAX1229 variants (including MAX1229BEEP+) are QSOP-only.
Can MAX1229BEEP+ perform simultaneous sampling of multiple channels?
No, MAX1229BEEP+ does not support simultaneous sampling - it uses a single SAR ADC core with multiplexed inputs and integrated track-and-hold. Channel sequencing is sequential within a scan, with typical acquisition time of 0.6µs and conversion time of 2.7µs per sample in externally clocked mode. True simultaneous sampling requires multiple independent ADC cores, which this device does not implement.
MAX1229BEEP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX1229BEEP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1229BEEP+ 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+ reliable?
The price and inventory of MAX1229BEEP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1229BEEP+ is usually 5 days.
3.What payment methods are accepted for MAX1229BEEP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1229BEEP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1229BEEP+?
MAX1229BEEP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1229BEEP+ 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+?
For technical support, including MAX1229BEEP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1229BEEP+ requirements.
6.How does Aetrix verify that MAX1229BEEP+ is sourced from the original manufacturer or authorized distributors?
All MAX1229BEEP+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX1229BEEP+?
All MAX1229BEEP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1229BEEP+, 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+ part is unused and in its original packaging.
Return procedure for MAX1229BEEP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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