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Analog Devices Inc./Maxim Integrated MAX1229BCEP+T
- Part No.:
- MAX1229BCEP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1229BCEP+T.pdf
- Description:
- IC ADC 12BIT SAR 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,807
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Product details
Overview
MAX1229BCEP+T 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 supports 12 single-ended or 6 true differential input channels in unipolar/bipolar modes and operates from a single +3V supply. It is used in industrial data-acquisition systems requiring simultaneous voltage and temperature monitoring with low-power, high-accuracy sampling.
For engineers reviewing the MAX1229BCEP+T datasheet, MAX1229BCEP+T pinout, MAX1229BCEP+T application, or MAX1229BCEP+T equivalent, this page delivers verified technical context, exact pin functions for the 20-pin QSOP package, real-world use cases in system supervision and patient monitoring, and two validated alternative ADCs with documented functional and packaging differences.
Technical Context
The MAX1229BCEP+T implements a fully differential successive-approximation register (SAR) architecture with on-chip track-and-hold, supporting both single-ended and true differential inputs. Its internal oscillator enables internally timed conversions in clock modes 00, 01, and 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 measurements in two's complement format at 1/8°C resolution. The 16-deep FIFO buffers conversion results-including temperature readings-enabling burst acquisition without serial bus contention, and scan/averaging modes allow configurable channel sequencing and noise reduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output codes with monotonic transfer function and no missing codes over temperature. |
| Sampling Rate | 300ksps maximum - supports high-speed transient capture when externally clocked; internally clocked rate depends on oscillator tolerance (±10%). |
| INL / DNL | ±1 LSB each - ensures accurate linearity for precision measurement applications such as calibration and instrumentation. |
| Temperature Accuracy | ±0.7°C at +25°C, ±1.2°C over –40°C to +85°C - enables reliable thermal monitoring without external sensor calibration. |
| Reference | Internal 2.48–2.52V bandgap reference - eliminates need for external reference IC; TCREF ≤ ±30ppm/°C ensures stable scaling across operating range. |
| Digital Interface | 10MHz 3-wire SPI/QSPI/MICROWIRE - compatible with standard microcontroller peripherals; supports CPOL/CPHA = 0 or 1 for flexible timing integration. |
| Supply Current | 1.75mA typical at 300ksps with internal reference - enables battery-powered or energy-constrained designs; drops to <5µA in AutoShutdown™ mode. |
Pinout & Package
MAX1229BCEP+T is packaged in a 20-pin QSOP (Quad Small Outline Package) with 0.65mm pitch, JEDEC MS-013AC compliant, and rated for 0°C to +70°C operation. The package is lead(Pb)-free and RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | AIN0 | Analog input channel 0 - configurable as single-ended or differential positive input (with AIN1); supports unipolar (0 to VREF) or bipolar (±VREF/2) ranges. |
| 2 | AIN1 | Analog input channel 1 - paired with AIN0 for true differential mode; also usable as standalone single-ended input. |
| 3 | AIN2 | Analog input channel 2 - part of AIN2/AIN3 differential pair; shares same configuration flexibility as AIN0/AIN1. |
| 4 | AIN3 | Analog input channel 3 - differential complement to AIN2; supports independent channel selection via setup register. |
| 5 | AIN4 | Analog input channel 4 - member of AIN4/AIN5 differential pair; usable in scan or single-channel acquisition modes. |
| 6 | AIN5 | Analog input channel 5 - differential partner to AIN4; configured via DIFFSEL bits in setup register. |
| 7 | REF-/AIN6 | Negative reference input or analog input 6 - dual-function pin; when REF- is selected, AIN6 is disabled per register programming. |
| 8 | CNVST/AIN7 | Active-low conversion start or analog input 7 - in clock modes 00/01, CNVST initiates conversions; otherwise functions as AIN7. |
| 9 | REF+ | Positive reference input - accepts internal 2.5V reference or external differential reference; requires 0.1µF bypass capacitor to GND. |
| 10 | GND | Analog/digital ground - common return for VDD, reference, and analog inputs; must be low-impedance for noise-sensitive measurements. |
| 11 | VDD | +2.7V to +3.6V power supply - powers all internal circuitry including T/H, SAR core, FIFO, and temperature sensor; requires local 0.1µF decoupling. |
| 12 | SCLK | Serial clock input - clocks data in/out on rising/falling edges; duty cycle must be 40–60%; max frequency 10MHz. |
| 13 | CS | Active-low chip select - enables serial interface and tri-states DOUT when high; controls data framing and read/write initiation. |
| 14 | DIN | Serial data input - latches 8-bit command bytes (setup, conversion, averaging registers) on SCLK rising edge. |
| 15 | DOUT | Serial data output - outputs 16-bit conversion results (MSB first, 4 leading zeros) on SCLK falling edge; high-impedance when CS = VDD. |
| 16 | EOC | End-of-conversion flag - active-low pulse indicates completion of last requested operation; behavior varies by clock mode (e.g., per-scan or per-channel). |
| 17–20 | N.C. | No connection - not internally bonded; left floating or tied to GND per PCB layout best practices; no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated temperature sensor | Delivers calibrated Celsius readings at 1/8°C resolution using internal reference - eliminates external sensor cost and layout complexity in thermal monitoring loops. |
| 16-entry FIFO buffer | Stores up to 16 voltage conversions plus one temperature reading - decouples acquisition from host processor timing, enabling efficient burst reads and reducing interrupt load. |
| True differential analog inputs | Supports 6 independent differential pairs (AIN0–AIN11) with common-mode rejection - improves noise immunity in industrial environments with ground offsets or EMI. |
| AutoShutdown™ mode | Reduces supply current to <5µA between conversions - extends battery life in portable data loggers and remote sensors without sacrificing wake-up latency. |
| Configurable clock modes | Four selectable timing schemes (CKSEL[1:0]) - enables flexible trade-offs between serial bus utilization, sampling rate control, and power efficiency across diverse system architectures. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of temperature, pressure, and flow sensor outputs in PLC-based factory automation systems. IC Role / Device Role / Timing Role: Primary multichannel ADC performing synchronized voltage and on-die temperature sampling at 100–300ksps rates. Use Value: Internal FIFO and scan mode eliminate microcontroller polling overhead; ±1 LSB INL ensures traceable calibration compliance for ISO 9001-certified production lines. |
Use Scenario: Compact wearable device measuring skin temperature and biopotential signals (ECG, EMG) with minimal external components. IC Role / Device Role / Timing Role: Dual-role signal conditioner - digitizing analog biosignals while concurrently monitoring its own die temperature for thermal drift compensation. Use Value: Single +3V supply and <2mA active current enable >72-hour battery life; ±0.7°C temp sensor accuracy meets IEC 60601-2-51 clinical requirements. |
| Environmental Data Logger | Power Supply Supervision |
Use Scenario: Solar-powered outdoor node recording ambient temperature, humidity (via resistive bridge), and battery voltage over extended periods. IC Role / Device Role / Timing Role: Low-power system monitor ADC acquiring temperature and auxiliary analog inputs during periodic wake cycles. Use Value: AutoShutdown™ reduces average current to µA range; internal reference stability (±30ppm/°C) maintains measurement integrity across –20°C to +60°C field conditions. |
Use Scenario: Real-time monitoring of rail voltages (+1.2V, +3.3V, +5V, +12V), current sense, and thermal margin in telecom server power modules. IC Role / Device Role / Timing Role: Fault-detection ADC feeding watchdog logic and PMBus-compatible digital controller via SPI interface. Use Value: 12-bit resolution and ±1 LSB DNL detect sub-1% voltage deviations; EOC pin provides deterministic timing for fault response within 3µs of event detection. |
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 |
|---|---|---|---|
| ADS7822U | 12-bit, 200ksps, 8-channel, no internal temp sensor, external reference only, SO-8 package | Lacks on-chip temperature sensing and FIFO; requires external reference and op-amp buffering for high-Z sources | Select when board space is constrained and temperature monitoring is handled separately; verify source impedance <300Ω due to longer tACQ. |
| AD7490BRUZ | 12-bit, 1MSPS, 16-channel, no internal temp sensor, SPI interface, TSSOP-28 package | Higher speed and channel count but no integrated temperature sensor; consumes ~2.5mA at full rate | Choose for high-throughput industrial DAQ where external temperature IC (e.g., TMP117) is already present and layout allows larger footprint. |
Compared with MAX1229BCEP+T, ADS7822U offers smaller size but sacrifices integrated thermal monitoring and FIFO-driven efficiency, while AD7490BRUZ provides higher sampling bandwidth at the cost of increased power and external thermal sensing complexity.
Availability
MAX1229BCEP+T is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, environmental data logging, and power supply supervision requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1229BCEP+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX1227/MAX1229/MAX1231 product line was designed for compact, low-power data-acquisition systems needing simultaneous analog voltage and on-die temperature measurement without external reference or timing components.
FAQ
What is the operating temperature range for MAX1229BCEP+T?
The MAX1229BCEP+T is specified for 0°C to +70°C operation, as indicated by the 'C' grade suffix in the part number. This commercial-grade rating makes it suitable for indoor industrial equipment, medical devices, and consumer data loggers where ambient temperatures remain within this envelope. The internal temperature sensor maintains ±0.7°C accuracy at +25°C and ±1.2°C across the full range.
Does MAX1229BCEP+T require an external reference voltage?
No, MAX1229BCEP+T includes a precision internal 2.5V reference (2.48V to 2.52V, ±30ppm/°C TC) that can be used directly for all conversions, including temperature measurements. 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 for basic operation.
How many analog input channels does MAX1229BCEP+T support?
MAX1229BCEP+T supports 12 single-ended analog input channels (AIN0–AIN11) or 6 true differential pairs (AIN0/AIN1 through AIN10/AIN11). Channel configuration is controlled via the setup register, and pins like REF-/AIN6 and CNVST/AIN7 are multiplexed - selecting one function disables the other per register setting.
Can MAX1229BCEP+T perform simultaneous sampling of multiple channels?
No, MAX1229BCEP+T uses a single SAR core with shared track-and-hold and does not support true simultaneous sampling. It performs sequential conversions across selected channels in scan mode, with typical inter-channel delay governed by tCONV (≤2.7µs) and tACQ (0.6µs). For synchronized multi-channel capture, external sample-hold circuits are required.
What package type is used for MAX1229BCEP+T?
MAX1229BCEP+T is supplied in a 20-pin QSOP (Quad Small Outline Package) with 0.65mm lead pitch, conforming to JEDEC MS-013AC. It is lead(Pb)-free and RoHS-compliant, denoted by the '+' suffix in the part number. This surface-mount package supports automated assembly and provides adequate thermal performance for its 1.75mA typical supply current.
MAX1229BCEP+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:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1229BCEP+T FAQ
1.How can I place an order for MAX1229BCEP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1229BCEP+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 MAX1229BCEP+T reliable?
The price and inventory of MAX1229BCEP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1229BCEP+T is usually 5 days.
3.What payment methods are accepted for MAX1229BCEP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1229BCEP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1229BCEP+T?
MAX1229BCEP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1229BCEP+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 MAX1229BCEP+T?
For technical support, including MAX1229BCEP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1229BCEP+T requirements.
6.How does Aetrix verify that MAX1229BCEP+T is sourced from the original manufacturer or authorized distributors?
All MAX1229BCEP+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 MAX1229BCEP+T meets industry standards.
7.What is the process for return or replacement of MAX1229BCEP+T?
All MAX1229BCEP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1229BCEP+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 MAX1229BCEP+T part is unused and in its original packaging.
Return procedure for MAX1229BCEP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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