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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:
- IC ADC 12BIT SAR 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,322
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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 3-wire interface. It features 12 single-ended or 6 true differential input channels, operates from a single +3V supply, and supports unipolar/bipolar modes - used in industrial data-acquisition systems for multi-sensor monitoring with on-chip averaging and AutoShutdown™.
For engineers reviewing the MAX1229BCEP+ datasheet, MAX1229BCEP+ pinout, MAX1229BCEP+ application, or MAX1229BCEP+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, QSOP-20 package mapping, confirmed pin functions, and two validated alternative parts - all grounded in Maxim's official documentation and electrical characteristics tables.
Technical Context
The MAX1229BCEP+ uses a fully differential successive-approximation register (SAR) architecture with on-chip track-and-hold, supporting both single-ended and true differential inputs across 12 configurable analog channels. Its internal oscillator enables internally timed conversions in clock modes 00/01/10, while mode 11 supports externally clocked operation up to 10MHz SCLK for full 300ksps throughput.
It integrates a dedicated temperature-sensing path using the internal reference, delivering results in two's complement format at 1/8°C resolution. The 16-deep FIFO buffers ADC outputs and temperature readings independently, allowing burst acquisition without serial bus contention - critical for deterministic sampling in embedded control loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output codes with no missing codes over temperature. |
| Sampling Rate | 300ksps maximum - achievable only with external clock (CKSEL=11); internal clock limits to ~270ksps. |
| INL / DNL | ±1 LSB - ensures monotonicity and <0.025% full-scale linearity error for precision sensor interfacing. |
| Temperature Accuracy | ±0.7°C at +25°C - enables direct board-level thermal monitoring without calibration. |
| Supply Current | 1.75mA at 300ksps (internal ref) - supports low-power battery-operated DAQ nodes. |
| Reference | Internal 2.48–2.52V ±30ppm/°C - eliminates external reference component cost and layout area. |
| Digital Interface | 10MHz SPI/QSPI/MICROWIRE 3-wire - compatible with most microcontrollers without level-shifting. |
Pinout & Package
MAX1229BCEP+ is housed in a 20-pin QSOP (Quad Small Outline Package) with 0.65mm pitch, JEDEC MS-013AC compliant, body size 7.2mm × 4.4mm. Pin 1 marked by notch or dot; exposed pad not present (TQFN variant has EP, QSOP does not).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | AIN0 | Channel 0 analog input - configurable as single-ended or differential positive (with AIN1). |
| 2 | AIN1 | Channel 1 analog input - differential negative pair for AIN0 in true differential mode. |
| 3 | AIN2 | Channel 2 analog input - supports single-ended or differential with AIN3. |
| 4 | AIN3 | Channel 3 analog input - differential negative for AIN2; shares same T/H structure. |
| 5 | AIN4 | Channel 4 analog input - extends multiplexed channel count to 12 single-ended inputs. |
| 6 | AIN5 | Channel 5 analog input - completes first six differential pairs (AIN0–AIN11). |
| 7 | REF-/AIN6 | External reference negative / analog input 6 - dual-function pin; REF- active when configured via setup register. |
| 8 | CNVST/AIN7 | Active-low conversion start / analog input 7 - hardware-triggered sampling without 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 - single ground plane required; bypass REF+ and VDD to this pin with 0.1µF ceramic. |
| 11 | VDD | +2.7V to +3.6V power supply - powers analog core, digital interface, and temperature sensor. |
| 12 | SCLK | Serial clock input - 40–60% duty cycle required; clocks DIN data in and DOUT data out. |
| 13 | CS | Active-low chip select - enables serial interface; high-Z DOUT when CS = VDD. |
| 14 | DIN | Serial data input - latched on rising SCLK edge; carries setup, conversion, and control register writes. |
| 15 | DOUT | Serial data output - valid on falling SCLK edge; outputs FIFO data MSB-first after CS low. |
| 16 | EOC | End-of-conversion flag - active-low pulse signals completion of last requested operation (except CKSEL=11). |
| 17–20 | AIN8–AIN11 | Channels 8–11 analog inputs - extend single-ended count to 12; support differential pairs AIN8/AIN9, AIN10/AIN11. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 16-entry FIFO | Buffers up to 16 ADC results + 1 temperature reading - decouples conversion timing from host processor latency. |
| True differential track-and-hold | Rejects common-mode noise on matched AINx/AINy pairs - enables accurate measurement in electrically noisy industrial environments. |
| Internal temperature sensor | ±0.7°C accuracy at +25°C, 1/8°C resolution - provides calibrated thermal feedback without external sensors or calibration routines. |
| AutoShutdown™ mode | Reduces supply current to ≤5µA during idle - extends battery life in portable data loggers between acquisition bursts. |
| Configurable clock modes | Four CKSEL options (00–11) - supports hardware-triggered, internally timed, or externally clocked acquisition strategies per system timing requirements. |
| Unipolar/bipolar mode selection | Software-selectable input ranges (0–VREF or ±VREF/2) - accommodates both DC-coupled sensor outputs and AC-coupled signals without external signal conditioning. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of temperature, pressure, and flow sensor outputs in PLC-based factory automation cabinets. IC Role / Device Role / Timing Role: Central 12-channel ADC with FIFO and temperature sensing - digitizes multiple analog process variables synchronously while reporting local board temperature for thermal derating. Use Value: Eliminates need for external reference and separate temperature IC, reducing BOM count and PCB area by >3 components per node. |
Use Scenario: Multi-parameter bedside monitor acquiring ECG, respiration, and skin temperature from isolated front-end analog circuits. IC Role / Device Role / Timing Role: Low-noise, low-power ADC with true differential inputs - rejects common-mode interference from 50/60Hz mains coupling in medical-grade isolation barriers. Use Value: ±1 LSB INL and 71dB SINAD ensure clinical-grade accuracy for waveform fidelity; AutoShutdown extends portable unit runtime. |
| Environmental Data Logger | Motor Drive Current Sensing |
Use Scenario: Solar-powered remote station measuring ambient temperature, humidity (via resistive sensor), and battery voltage over extended periods. IC Role / Device Role / Timing Role: Single-supply 3V ADC with internal reference and temperature sensor - performs self-calibrating measurements using on-chip thermal data to compensate sensor drift. Use Value: Internal 2.5V reference stability (±30ppm/°C) and ±0.7°C temp accuracy enable <1% total system error without field recalibration. |
Use Scenario: Real-time phase current sampling in 3-phase inverter drives, requiring simultaneous capture of three shunt voltages with precise timing alignment. IC Role / Device Role / Timing Role: Hardware-triggered ADC (CNVST pin) with scan mode - initiates synchronized conversions across AIN0–AIN5 on single edge, feeding FIFO for burst readout. Use Value: 300ksps external-clock mode and 1µs acquisition time support >10kHz current loop bandwidth; differential inputs reject PWM switching noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel, low-power ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953IRHBT | 12-bit, 1MSPS, 16-channel, SPI interface, no internal temp sensor or FIFO; requires external reference. | Better speed and channel count, but lacks integrated temperature sensing and FIFO buffering - demands additional ICs for thermal monitoring and burst acquisition. | Select when sampling rate >300ksps is mandatory and system can accommodate external reference + temp IC. |
| AD7476ARTZ-REEL7 | 12-bit, 1MSPS, 1-channel, no FIFO, no temp sensor, no internal reference - ultra-small SOT-23-6 package. | Single-channel only; no multiplexer, FIFO, or temperature capability - suitable only for point-measurement, not system-level monitoring. | Select only for space-constrained, single-signal applications where all other MAX1229BCEP+ features are unnecessary. |
Compared with MAX1229BCEP+, ADS7953IRHBT offers higher speed and channel density but increases system complexity with external reference and temperature sensing, while AD7476ARTZ-REEL7 sacrifices all integration benefits for minimal footprint - making MAX1229BCEP+ optimal for compact, self-contained multi-sensor DAQ nodes.
Availability
MAX1229BCEP+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable patient monitors, environmental data loggers, and motor drive current sensing requiring stable component supply across extended temperature ranges (0°C to +70°C).
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 family was engineered for embedded data-acquisition systems needing integrated signal conditioning, temperature awareness, and low-power serial interfacing - targeting space- and power-constrained instrumentation where external components must be minimized.
FAQ
What is the operating temperature range for MAX1229BCEP+?
The MAX1229BCEP+ is specified for 0°C to +70°C operation, as indicated by the 'C' grade suffix in the part number. This commercial-grade temperature range aligns with its intended use in controlled-environment instrumentation and non-automotive industrial systems. The device maintains full performance - including ±1 LSB INL, ±0.7°C temperature accuracy, and 300ksps sampling - across this entire range.
Does MAX1229BCEP+ require an external reference voltage?
No, MAX1229BCEP+ does not require an external reference voltage - it includes a factory-trimmed internal 2.5V reference with ±30ppm/°C temperature coefficient and 200µVRMS noise. External reference operation is optional and enabled via the REFSEL bits in the setup register; using the internal reference simplifies design, reduces component count, and maintains full 12-bit accuracy.
How many analog input channels does MAX1229BCEP+ support?
MAX1229BCEP+ supports 12 single-ended analog input channels (AIN0–AIN11) or 6 true differential input pairs (AIN0/AIN1, AIN2/AIN3, AIN4/AIN5, AIN6/AIN7, AIN8/AIN9, AIN10/AIN11). Channel configuration is software-controlled via the setup and conversion registers, and all channels share the same 12-bit SAR core and internal track-and-hold circuitry.
Can MAX1229BCEP+ perform temperature measurements?
Yes, MAX1229BCEP+ integrates a calibrated on-die temperature sensor with ±0.7°C accuracy at +25°C and ±1.2°C over the full 0°C to +70°C range. Temperature readings are delivered as two's complement values at 1/8°C resolution through the same FIFO buffer used for analog conversions - accessible via the TEMP bit in the conversion register.
What package type is used for MAX1229BCEP+?
MAX1229BCEP+ uses a 20-pin QSOP (Quad Small Outline Package) with standard JEDEC MS-013AC dimensions (7.2mm × 4.4mm body, 0.65mm lead pitch). The '+' suffix confirms RoHS-compliance and lead-free finish. Unlike the MAX1231 TQFN variant, this QSOP package has no exposed pad and is compatible with standard surface-mount reflow profiles.
MAX1229BCEP+ 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:
- 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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