Analog Devices Inc./Maxim Integrated MAX1229AEEP+T

Overview

The MAX1229AEEP+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 buffer, 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 for industrial data acquisition and system supervision.

For engineers reviewing the MAX1229AEEP+T datasheet, MAX1229AEEP+T pinout, MAX1229AEEP+T application, or MAX1229AEEP+T equivalent, this device delivers verified DC accuracy (±1 LSB INL/DNL), low-power operation (1mA at full rate), on-chip track-and-hold, internal clocking, and AutoShutdown™-all in a 20-pin QSOP package rated for -40°C to +85°C.

Technical Context

The MAX1229AEEP+T employs 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 conversion timing in clock modes 00, 01, and 10, while external SCLK up to 10MHz drives high-speed serial communication.

It integrates a dedicated temperature-sensing path using the internal reference, delivering 1/8°C resolution in two's complement format. The 16-deep FIFO buffers ADC results and temperature readings independently, allowing burst acquisition without serial bus contention-critical for real-time monitoring in embedded control systems.

Key Specifications

Pinout & Package

MAX1229AEEP+T is housed in a 20-pin QSOP (Quad Small Outline Package) with 0.65mm pitch and standard JEDEC MO-137AC footprint. Pin 1 is marked by a beveled corner; the package is RoHS-compliant and lead(Pb)-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit multichannel ADC applications.

Compared with ADS7822U and AD7490BRUZ, the MAX1229AEEP+T uniquely combines 12-channel flexibility, on-die temperature sensing, 16-deep FIFO, and AutoShutdown™ in a single +3V supply QSOP-reducing BOM count and firmware overhead in space-constrained embedded systems.

Availability

MAX1229AEEP+T is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, environmental data logging, and embedded system supervision requiring stable component supply across extended temperature ranges.

Supply support for MAX1229AEEP+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 in resource-constrained embedded systems-integrating ADC, temperature sensing, FIFO, and serial interface to minimize external components and firmware complexity.

FAQ

What is the maximum sampling rate achievable with the MAX1229AEEP+T?

The MAX1229AEEP+T achieves a maximum sampling rate of 300ksps when using an external clock source with SCLK up to 10MHz. In internally clocked modes (00, 01, 10), the effective rate depends on oscillator tolerance (±10% of 4.4MHz) and configuration-typically supporting sustained 100–250ksps depending on averaging and FIFO usage. The MAX1229AEEP+T datasheet specifies timing under fSCLK = 4.8MHz conditions for guaranteed performance.

Does the MAX1229AEEP+T require an external reference voltage?

No, the MAX1229AEEP+T includes a factory-trimmed 2.50V internal reference with ±20mV initial accuracy and ±30ppm/°C temperature coefficient-sufficient for most industrial and medical applications. An external differential reference can be applied via REF+ and REF− pins if higher precision or custom scaling is required, but doing so disables the internal temperature sensor functionality in the MAX1229AEEP+T.

How many analog input channels does the MAX1229AEEP+T support?

The MAX1229AEEP+T supports 12 single-ended analog input channels (AIN0 through AIN11) or 6 true differential pairs (e.g., AIN0/AIN1, AIN2/AIN3, up to AIN10/AIN11). Channel configuration is controlled via the setup and conversion registers-AIN10 and AIN11 are accessible only when not assigned to REF− or CNVST functions in the MAX1229AEEP+T pin mapping.

What is the purpose of the FIFO buffer in the MAX1229AEEP+T?

The 16-entry FIFO in the MAX1229AEEP+T stores completed ADC conversion results and temperature measurements independently, enabling autonomous burst acquisition without continuous host processor intervention. This reduces serial bus contention and interrupt load-particularly valuable in scan mode or when interleaving voltage and temperature reads. When full, new results overwrite the oldest entries, ensuring continuous data flow in the MAX1229AEEP+T.

Can the MAX1229AEEP+T operate in bipolar input mode?

Yes, the MAX1229AEEP+T supports bipolar input mode for differential conversions, setting the input range to ±VREF/2 with two's complement output coding. This is configured per channel pair via the bipolar register (bits written to setup register). Single-ended inputs always operate in unipolar mode (0 to VREF) and output binary-coded values-no bipolar option is available for those configurations in the MAX1229AEEP+T.