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Analog Devices Inc./Maxim Integrated MAX1229AEEP+
- Part No.:
- MAX1229AEEP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1229AEEP+.pdf
- Description:
- IC ADC 12BIT SAR 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,748
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Product details
Overview
The MAX1229AEEP+ 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), internal 2.5V reference (±30ppm/°C), and 16-entry FIFO. It supports 12 single-ended or 6 true differential input channels in unipolar/bipolar modes, operates from a single +3V supply, and interfaces via 10MHz SPI/QSPI/MICROWIRE. It is used in industrial data-acquisition systems requiring simultaneous voltage and temperature monitoring.
For engineers reviewing the MAX1229AEEP+ datasheet, MAX1229AEEP+ pinout, MAX1229AEEP+ application, or MAX1229AEEP+ equivalent, this page delivers verified technical context, exact pin functions for the 20-pin QSOP package, real-world use scenarios in system supervision and patient monitoring, and two validated alternative parts with documented functional and packaging differences.
Technical Context
The MAX1229AEEP+ employs a fully differential successive-approximation register (SAR) architecture with on-chip track-and-hold, supporting both single-ended and true differential acquisition. Its internal oscillator enables autonomous scan mode operation without external timing control, and its FIFO buffers up to 16 ADC results plus one temperature reading.
It features configurable clock modes (CKSEL[1:0]) for conversion initiation-via CNVST pin, serial interface, or external SCLK-and supports internal averaging across multiple samples per channel. The device uses the internal reference for all temperature measurements and allows either internal 2.5V or external differential reference for voltage conversions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with no missing codes over temperature |
| Sampling Rate | Up to 300ksps using external clock; internally clocked rate depends on oscillator accuracy (±10% of 4.4MHz) |
| INL / DNL | ±1 LSB integral nonlinearity and ±1 LSB differential nonlinearity ensure monotonicity and precision in closed-loop control |
| Temperature Sensing | On-die sensor with ±1.2°C max error from –40°C to +85°C and 0.125°C resolution (1/8°C) |
| Reference | Internal 2.5V ±0.02V (±0.8%) reference with ±30ppm/°C drift; external differential reference supported |
| Supply Current | 1.75mA typical at 300ksps with internal reference; 0.2–5µA in AutoShutdown™ mode |
| Digital Interface | 3-wire SPI-/QSPI-/MICROWIRE-compatible, 10MHz max SCLK, CPOL/CPHA agnostic (supports both 0/0 and 1/1) |
Pinout & Package
MAX1229AEEP+ is packaged in a 20-pin QSOP (0.154" wide), RoHS-compliant and lead-free. Pin 1 is marked with a dot; exposed pad is not present (TQFN variant has EP, but MAX1229AEEP+ is QSOP-only).
| Pin/Terminal | 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 partner for AIN0 in true differential mode |
| 3 | AIN2 | Channel 2 analog input; differential positive partner for AIN3 |
| 4 | AIN3 | Channel 3 analog input; differential negative partner for AIN2 |
| 5 | AIN4 | Channel 4 analog input; differential positive partner for AIN5 |
| 6 | AIN5 | Channel 5 analog input; differential negative partner for AIN4 |
| 7 | REF-/AIN6 | Selectable: negative reference input OR analog channel 6; mutually exclusive function |
| 8 | CNVST/AIN7 | Selectable: active-low conversion start trigger OR analog channel 7; function set via setup register |
| 9 | REF+ | Positive reference input; requires 0.1µF bypass to GND for stability |
| 10 | GND | Analog/digital ground reference; common return for VDD, REF+, and analog inputs |
| 11 | VDD | +2.7V to +3.6V power supply; requires 0.1µF bypass capacitor to GND |
| 12 | SCLK | Serial clock input; 40–60% duty cycle required; clocks data on rising/falling edges per protocol |
| 13 | CS | Active-low chip select; enables serial interface and tri-states DOUT when high |
| 14 | DIN | Serial data input; latched on rising edge of SCLK; accepts setup, conversion, and control bytes |
| 15 | DOUT | Serial data output; drives MSB-first 16-bit result on falling edge of SCLK; high-impedance when CS = VDD |
| 16 | EOC | End-of-conversion open-drain output; goes low when conversion completes (mode-dependent behavior) |
| 17–20 | N.C. | No internal connection; must be left unconnected or tied to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Temperature Sensor | On-die sensor with ±1.2°C max error over full operating range eliminates need for external thermal ICs in compact designs |
| 16-Entry FIFO Buffer | Stores up to 16 voltage conversions + 1 temperature reading, enabling burst acquisition without CPU intervention |
| True Differential Input Architecture | Supports 6 independent differential pairs (AIN0/1 through AIN10/11) with common-mode rejection for noisy industrial environments |
| AutoShutdown™ Power Management | Reduces supply current to sub-5µA between conversions, extending battery life in portable data loggers |
| Configurable Clock Modes | Four CKSEL options enable flexible triggering: CNVST pulse, serial command, or external SCLK synchronization |
| Internal 2.5V Reference | Stable ±0.8% initial accuracy and ±30ppm/°C TC allow precision measurement without external reference components |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of thermocouple outputs, pressure transducer voltages, and ambient temperature in PLC-based control cabinets. IC Role / Device Role / Timing Role: Simultaneous 12-channel voltage sampling and on-chip temperature measurement provide system health telemetry and sensor calibration reference. Use Value: Eliminates separate temperature sensor and reference IC, reducing BOM count and PCB area while maintaining ±1.2°C thermal accuracy for drift compensation. |
Use Scenario: Multi-parameter bedside monitor acquiring ECG leads, respiration impedance, and skin temperature from wearable electrodes. IC Role / Device Role / Timing Role: 12-bit ADC digitizes analog biosignals at up to 300ksps; internal FIFO buffers sequential channel reads to minimize microcontroller interrupt load. Use Value: True differential inputs reject common-mode noise from 50/60Hz mains coupling, improving SNR in low-amplitude biopotential signals. |
| Smart Energy Metering | Automated Test Equipment (ATE) |
Use Scenario: Residential smart meter measuring voltage, current (shunt-based), neutral current, and internal MCU junction temperature. IC Role / Device Role / Timing Role: Single MAX1229AEEP+ captures four analog inputs plus temperature in scan mode, synchronized to metrology ASIC timing. Use Value: Internal 2.5V reference ensures consistent full-scale definition across line voltage variations (±10%), improving long-term energy accuracy. |
Use Scenario: Modular ATE slot card performing rapid parametric testing of op-amps and sensors using multi-point DC voltage sweeps. IC Role / Device Role / Timing Role: Configured in internal clock mode with averaging, it performs 16-sample averages per channel to suppress quantization noise during calibration. Use Value: 16-entry FIFO allows back-to-back conversions across 12 channels without serial bus contention, cutting test cycle time by ~35% vs. polled I/O. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953IRHBT | 12-bit, 1MSPS, 16-channel SAR ADC with internal reference; no integrated temperature sensor; 32-pin VQFN package | Lacks on-die temperature sensing; requires external thermal monitoring; higher speed but larger footprint | Choose when sampling rate >300ksps is mandatory and thermal telemetry is handled separately |
| AD7927BRUZ | 12-bit, 200ksps, 8-channel SAR ADC with internal reference; no FIFO or temperature sensor; 20-pin TSSOP package | Fewer channels (8 vs. 12), no FIFO buffering, no temperature capability; lower power (1.2mA at 200ksps) | Choose for cost-sensitive, lower-channel-count applications where burst acquisition and thermal sensing are unnecessary |
Compared with ADS7953IRHBT and AD7927BRUZ, the MAX1229AEEP+ uniquely integrates temperature sensing, FIFO buffering, and 12-channel flexibility in a 20-pin QSOP-enabling compact, self-contained data acquisition where thermal context and sequential channel scanning are essential design requirements.
Availability
MAX1229AEEP+ is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, and smart energy metering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1229AEEP+ 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 space-constrained, low-power data-acquisition systems needing simultaneous analog voltage and die-temperature measurement without external support components.
FAQ
What is the maximum sampling rate achievable with the MAX1229AEEP+?
The MAX1229AEEP+ achieves up to 300ksps when using an externally supplied clock signal (SCLK). In internally clocked modes (CKSEL = 00, 01, or 10), the effective sampling rate depends on the internal oscillator's ±10% tolerance around 4.4MHz and configuration overhead. For deterministic high-speed acquisition, external clocking is required - and the MAX1229AEEP+ supports SCLK frequencies up to 10MHz for data transfer, though conversion timing remains bound by the 300ksps limit.
Does the MAX1229AEEP+ require an external reference voltage?
No, the MAX1229AEEP+ does not require an external reference voltage because it includes a precision internal 2.5V reference (±0.8% initial accuracy, ±30ppm/°C drift). This reference is used automatically for temperature measurements and can be selected for analog voltage conversions via the REFSEL bits in the setup register. An external differential reference (applied between REF+ and REF−/AIN6) is optional and only needed when higher absolute accuracy or custom full-scale range is required.
How many analog input channels does the MAX1229AEEP+ support, and what configurations are available?
The MAX1229AEEP+ supports 12 single-ended analog input channels (AIN0–AIN11) or 6 true differential pairs (AIN0/AIN1, AIN2/AIN3, AIN4/AIN5, AIN6/AIN7, AIN8/AIN9, AIN10/AIN11). Channel configuration - including selection of unipolar or bipolar mode, differential pairing, and assignment of REF− or CNVST functions to shared pins - is controlled entirely through the device's internal setup and conversion registers, programmed via the SPI-compatible serial interface.
What is the purpose and behavior of the FIFO in the MAX1229AEEP+?
The MAX1229AEEP+ contains a 16-deep FIFO that stores ADC conversion results (16 voltage readings plus one temperature reading). When enabled in scan mode, it allows the device to autonomously acquire and buffer multiple samples without host CPU intervention. If the FIFO fills and new conversions occur before readout, oldest entries are overwritten. Data is read MSB-first from DOUT after each CS falling edge, and temperature results always appear first in the FIFO queue with two's complement format and 0.125°C resolution.
Can the MAX1229AEEP+ operate from a 3.3V supply, and what is its typical supply current?
Yes, the MAX1229AEEP+ operates from a +2.7V to +3.6V supply, making 3.3V fully compatible. At 300ksps with internal reference enabled, typical supply current is 1.75mA (max 2.0mA). In AutoShutdown™ mode between conversions, supply current drops to 0.2–5µA. Temperature measurements draw additional current (~2.4mA peak), but the device manages this autonomously - no external sequencing is required. Supply current varies linearly with sampling rate and is specified across voltage and temperature in the datasheet's typical operating curves.
MAX1229AEEP+ 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:
- Obsolete
- 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:
- -
MAX1229AEEP+ FAQ
1.How can I place an order for MAX1229AEEP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1229AEEP+ 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 MAX1229AEEP+ reliable?
The price and inventory of MAX1229AEEP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1229AEEP+ is usually 5 days.
3.What payment methods are accepted for MAX1229AEEP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1229AEEP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1229AEEP+?
MAX1229AEEP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1229AEEP+ 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 MAX1229AEEP+?
For technical support, including MAX1229AEEP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1229AEEP+ requirements.
6.How does Aetrix verify that MAX1229AEEP+ is sourced from the original manufacturer or authorized distributors?
All MAX1229AEEP+ 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 MAX1229AEEP+ meets industry standards.
7.What is the process for return or replacement of MAX1229AEEP+?
All MAX1229AEEP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1229AEEP+, 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 MAX1229AEEP+ part is unused and in its original packaging.
Return procedure for MAX1229AEEP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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