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Analog Devices Inc./Maxim Integrated MAX1229BCEP
- Part No.:
- MAX1229BCEP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1229BCEP.pdf
- Description:
- 12-BIT ADC WITH FIFO
- Quantity:
- Payment:
- Shipping:
Inventory:2,622
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Product details
Overview
MAX1229BCEP from Maxim Integrated is a 12-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor (±0.7°C accuracy), 16-entry FIFO, internal 2.5V reference, and SPI/QSPI/MICROWIRE-compatible interface. It features 12 single-ended or 6 true differential input channels, operates from a +3V supply, and targets precision system supervision and industrial data acquisition.
For engineers reviewing the MAX1229BCEP datasheet, MAX1229BCEP pinout, MAX1229BCEP application, or MAX1229BCEP equivalent, this device supports unipolar/bipolar differential acquisition, internal clocking modes, AutoShutdown™ for low-power operation (1mA at full rate), and on-chip averaging-critical for embedded monitoring and sensor interface designs requiring stable timing and thermal awareness.
Technical Context
The MAX1229BCEP uses a fully differential successive-approximation register (SAR) architecture with integrated track-and-hold, supporting both single-ended and true differential inputs across 12 configurable analog channels. Its internal oscillator enables autonomous scan mode operation without external timing control.
It implements a 16-deep first-in/first-out (FIFO) buffer that stores ADC results and temperature measurements, decoupling conversion from serial readout. The device supports four clock modes-including CNVST-triggered and internally timed conversions-and delivers ±1 LSB INL/DNL with no missing codes over –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output levels with monotonic response and no missing codes. |
| Sampling Rate | 300ksps max (externally clocked) - supports high-speed transient capture in industrial control loops. |
| Input Channels | 12 single-ended or 6 true differential - enables flexible sensor multiplexing without external mux hardware. |
| Temperature Accuracy | ±0.7°C at +25°C, ±1.2°C over full range - provides reliable on-die thermal monitoring for system health management. |
| Reference | Internal 2.5V ±0.8% (±30ppm/°C TC) - eliminates need for external reference in cost-sensitive applications. |
| Digital Interface | 10MHz 3-wire SPI/QSPI/MICROWIRE - compatible with standard microcontroller peripherals and supports CPOL/CPHA = 0 or 1. |
| Supply Current | 1mA at 300ksps, 0.2–5µA in shutdown - enables battery-powered or energy-constrained deployments. |
Pinout & Package
MAX1229BCEP is housed in a 20-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch) with gull-wing leads. Pin 1 is marked by a beveled corner; exposed pad is not present (TQFN variant applies only to MAX1231).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | AIN0 | Analog input channel 0 - configurable as single-ended or differential positive input (with AIN1). |
| 2 | AIN1 | Analog input channel 1 - paired with AIN0 for true differential acquisition. |
| 3 | AIN2 | Analog input channel 2 - supports single-ended or differential (with AIN3). |
| 4 | AIN3 | Analog input channel 3 - differential complement to AIN2. |
| 5 | AIN4 | Analog input channel 4 - supports single-ended or differential (with AIN5). |
| 6 | AIN5 | Analog input channel 5 - differential complement to AIN4. |
| 7 | REF-/AIN6 | Negative reference input or analog channel 6 - dual-function pin; REF- active when configured via setup register. |
| 8 | CNVST/AIN7 | Active-low conversion start or analog channel 7 - pulse-triggered acquisition bypasses serial bus overhead. |
| 9 | REF+ | Positive reference input - accepts internal 2.5V ref or external differential reference up to VDD + 50mV. |
| 10 | GND | Analog/digital ground - common return for reference, analog inputs, and digital I/O. |
| 11 | VDD | +2.7V to +3.6V power supply - powers analog core, digital interface, and temperature sensor. |
| 12 | SCLK | Serial clock input - clocks data in/out; 40–60% duty cycle required; max 10MHz frequency. |
| 13 | CS | Active-low chip select - enables serial interface and tri-states DOUT when high. |
| 14 | DIN | Serial data input - latched on rising SCLK edge; carries setup, conversion, and configuration commands. |
| 15 | DOUT | Serial data output - outputs 16-bit result (MSB first) on falling SCLK edge; high-impedance when CS = high. |
| 16 | EOC | End-of-conversion flag - active-low pulse signals completion of last requested operation (except clock mode 11). |
| 17–20 | AIN8–AIN11 | Analog input channels 8–11 - available only on MAX1229/MAX1231; support single-ended or differential pairs (AIN8/AIN9, etc.). |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 16-entry FIFO | Buffers up to 16 ADC results plus one temperature reading - enables burst acquisition without CPU intervention. |
| True differential track-and-hold | Supports 6 independent differential pairs (e.g., AIN0/AIN1) with common-mode noise rejection - improves SNR in noisy industrial environments. |
| Internal temperature sensor | ±0.7°C accuracy at +25°C, 1/8°C resolution - provides calibrated die temperature for thermal compensation or safety monitoring. |
| Four selectable clock modes | Enables CNVST-triggered, internally timed, or externally clocked acquisition - optimizes timing flexibility vs. serial bus utilization. |
| AutoShutdown™ | Reduces supply current to ≤5µA after conversion - extends battery life in portable instrumentation and remote sensors. |
| Unipolar/bipolar mode selection | Configurable per-channel via setup register - supports 0–VREF (unipolar) or ±VREF/2 (bipolar) differential ranges with two's complement output. |
Applications
| System Supervision | Data-Acquisition Systems |
|---|---|
Use Scenario: Real-time voltage, current, and temperature monitoring in programmable logic controllers (PLCs) and power supply units. IC Role / Device Role / Timing Role: Primary ADC for multi-sensor analog front-end, performing synchronized sampling with internal FIFO buffering. Use Value: Eliminates external reference and temperature sensor components while maintaining ±1 LSB linearity across –40°C to +85°C. |
Use Scenario: Portable environmental data loggers capturing temperature, humidity, and pressure over extended periods. IC Role / Device Role / Timing Role: Low-power, self-timed ADC managing autonomous scan sequences and on-chip averaging to reduce host MCU load. Use Value: 1mA active current and AutoShutdown™ enable >1-year battery life; internal 2.5V reference ensures measurement stability without calibration drift. |
| Industrial Control Systems | Patient Monitoring |
Use Scenario: Closed-loop motor control systems requiring simultaneous sampling of position feedback, current sense, and thermal protection signals. IC Role / Device Role / Timing Role: Multichannel SAR ADC with true differential inputs and configurable scan modes for deterministic acquisition timing. Use Value: 6 differential channel pairs reject common-mode noise from PWM-driven actuators; ±1 LSB DNL guarantees monotonic control response. |
Use Scenario: Bedside vital sign monitors acquiring ECG, respiration, and skin temperature with clinical-grade accuracy. IC Role / Device Role / Timing Role: Medical-grade analog front-end ADC providing isolated, low-noise digitization with integrated temperature sensing for probe calibration. Use Value: ±0.7°C temperature sensor accuracy meets IEC 60601-1 thermal safety requirements; 71dB SINAD supports diagnostic-level signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953IRHBT | 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 - increases BOM count and layout complexity. | Select when higher throughput (>300ksps) and more channels are needed, and thermal monitoring is handled separately. |
| AD7490BRUZ | 12-bit, 1MSPS, 16-channel, SPI interface, no FIFO, no temp sensor, internal reference only (2.5V). | No FIFO or temperature sensor; simpler feature set limits autonomous operation and thermal awareness in compact systems. | Choose for cost-sensitive, high-speed applications where FIFO buffering and die temperature are not required. |
Compared with ADS7953IRHBT and AD7490BRUZ, the MAX1229BCEP uniquely integrates FIFO, temperature sensor, and internal reference in a 20-pin QSOP - reducing component count and enabling self-contained thermal-aware data acquisition without external support circuitry.
Availability
MAX1229BCEP is available at Aetrix Electronics and suitable for industrial control systems, medical patient monitors, and environmental data loggers requiring stable component supply and long-term production continuity.
Supply support for MAX1229BCEP 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 delivers highly integrated, low-power SAR ADCs with on-chip intelligence - targeting embedded system supervision where space, power, and thermal awareness are critical constraints.
FAQ
What is the operating temperature range for the MAX1229BCEP?
The MAX1229BCEP is specified for operation from 0°C to +70°C, as indicated by the "C" grade suffix in the part number. This commercial-grade temperature range supports use in office equipment, test instruments, and non-extreme industrial environments. The device maintains ±1 LSB INL/DNL and ±0.7°C temperature sensor accuracy across this range, with full functionality including FIFO, averaging, and AutoShutdown™.
Does the MAX1229BCEP require an external reference voltage?
No, the MAX1229BCEP includes a precision internal 2.5V reference (±0.8%, ±30ppm/°C TC) that can be used directly for all conversions. An external differential reference may be applied via REF+ and REF-/AIN6 pins if higher accuracy or custom scaling is required, but it is not mandatory. The internal reference remains active during temperature measurements regardless of REFSEL setting.
How many analog input channels does the MAX1229BCEP support?
The MAX1229BCEP supports 12 single-ended analog input channels (AIN0–AIN11) or 6 true differential input pairs (e.g., AIN0/AIN1, AIN2/AIN3, etc.). Channel configuration is controlled via the setup register, and pins such as REF-/AIN6 and CNVST/AIN7 are multifunctional - they serve as analog inputs only when not assigned to reference or conversion-start roles.
Can the MAX1229BCEP perform automatic temperature measurements?
Yes, the MAX1229BCEP includes a factory-calibrated on-die temperature sensor with ±0.7°C accuracy at +25°C and ±1.2°C over 0°C to +70°C. Temperature readings are acquired autonomously alongside voltage conversions, stored in the same 16-entry FIFO, and output as two's complement values with 1/8°C resolution - accessible via the same SPI interface used for analog data.
What package type is used for the MAX1229BCEP?
The MAX1229BCEP is packaged in a 20-pin QSOP (Quad Small Outline Package) measuring 5.3mm × 10.2mm with 0.65mm lead pitch. This surface-mount package is RoHS-compliant (denoted by the "+" suffix), offers gull-wing leads for reliable reflow soldering, and is distinct from the TQFN variants used for the MAX1231 - confirming no exposed pad or thermal enhancement is present in this variant.
MAX1229BCEP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 300k
- Number of Inputs:
- 6, 12
- Input Type:
- Differential, Single Ended
- Data Interface:
- 3-Wire Serial, Microwire, QSPI, 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:
- Internal Oscillator, Temperature Sensor
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1229BCEP FAQ
1.How can I place an order for MAX1229BCEP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1229BCEP 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 MAX1229BCEP reliable?
The price and inventory of MAX1229BCEP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1229BCEP is usually 5 days.
3.What payment methods are accepted for MAX1229BCEP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1229BCEP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1229BCEP?
MAX1229BCEP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1229BCEP 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 MAX1229BCEP?
For technical support, including MAX1229BCEP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1229BCEP requirements.
6.How does Aetrix verify that MAX1229BCEP is sourced from the original manufacturer or authorized distributors?
All MAX1229BCEP 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 MAX1229BCEP meets industry standards.
7.What is the process for return or replacement of MAX1229BCEP?
All MAX1229BCEP units undergo pre-shipment inspection (PSI). If there is an issue with MAX1229BCEP, 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 MAX1229BCEP part is unused and in its original packaging.
Return procedure for MAX1229BCEP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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