MAX1228BEEP+TG002 - 12-Bit 300ksps ADC with FIFO | Analog Devices
MPN: MAX1228BEEP+TG002 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.85 | $12.85 |
| 10 | $11.55 | $115.50 |
| 100 | $10.2 | $1,020.00 |
| 500 | $8.95 | $4,475.00 |
| 1,000 | $7.8 | $7,800.00 |
MAX1228BEEP+TG002 Overview
A successive-approximation-register (SAR) ADC is a converter topology that uses a binary-weighted capacitor network and a comparator to digitize an analog input in N clock cycles for an N-bit result. SAR ADCs are valued for their deterministic latency, lack of pipeline delay, and excellent DC accuracy - properties that make them ideal for multiplexed multi-channel applications, precision sensor readout, and industrial process control where a known sampling instant matters.
Key features include 12-bit resolution, 300 ksps sampling rate, internal 4.096 V reference, internal temperature sensor with -40C to +85C operating range, 6- or 12-channel single-ended or differential input multiplexer, on-chip FIFO for up to 16 conversions, AutoShutdown mode that drops supply current to under 1 microampere between samples, and a 20 MHz SPI/QSPI/MICROWIRE-compatible serial interface. The 20-pin QSOP footprint occupies 5.0 mm x 5.6 mm of board area for compact front-end modules.
The MAX1228 uses a charge-redistribution SAR core with input track-and-hold, with the analog inputs overdriven-tolerant to the supply rails. The internal reference is trimmed to within 1 percent accuracy and supports ratiometric measurements using an external REF. An internal temperature sensor exploits the proportional-to-absolute-temperature behavior of a bipolar transistor junction, allowing the host to perform cold-junction compensation or thermal monitoring with the same ADC front-end.
Typical applications include 4-20 mA industrial loop transmitters, multi-zone temperature monitoring, portable data loggers, PLC analog input modules, and medical patient-monitoring front ends. The internal FIFO eases host processor burden in real-time control loops.
When designing with this ADC, observe the input RC network recommended in the datasheet and place the 1 nF CIN and 10 nF REF bypass capacitors within 5 mm of their respective pins to preserve AC performance.
This page synthesizes distributor pricing, drop-in alternatives, and engineering design notes not found in the bare manufacturer datasheet.
Drop-in alternatives for MAX1228BEEP+TG002 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MAX1228BEEP+TG002 (same form factor and footprint) — differing in Architecture, FIFO Depth, Input Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX1228BEEP+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1228BEEP+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1228AEEP+T
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$6.78 / Unit
View Datasheet →MAX1226EAP+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1227ECQ+TD
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX1228BEEP+TG002 Maximum Ratings & Electrical Characteristics
| Resolution | 12 bit |
| Sampling Rate | 300 ksps |
| Number of Channels | 6 or 12 input (single-ended/differential) |
| Architecture | SAR (Successive Approximation Register) |
| Interface | SPI/QSPI/MICROWIRE-compatible serial |
| Input Type | Differential, Single-Ended |
| Reference | Internal 4.096 V (External also supported) |
| Temperature Sensor | Internal |
| FIFO Depth | 16 conversions |
| Special Features | AutoShutdown, scan mode, internal averaging, internal clock |
| Supply Voltage | 4.75 V to 5.25 V (single supply) |
| Analog Input Range | 0 V to VREF (unipolar) |
| Operating Temperature | -40C to +85C |
| Package | 20-pin QSOP |
| Mounting Type | Surface Mount |
MAX1228BEEP+TG002 Pin Configuration
| Pin 1 | AIN0 — Analog input channel 0 (single-ended positive or differential positive) |
| Pin 2 | AIN1 — Analog input channel 1 |
| Pin 3 | AIN2 — Analog input channel 2 / AIN1- differential pair |
| Pin 4 | AIN3 — Analog input channel 3 / AIN0- differential pair |
| Pin 5 | AIN4 — Analog input channel 4 |
| Pin 6 | AIN5 — Analog input channel 5 |
| Pin 7 | REF — Reference voltage input/output (4.096 V internal) |
| Pin 8 | GND — Ground |
| Pin 9 | AVDD — Analog supply (4.75 V to 5.25 V) |
| Pin 10 | DOUT — Serial data output (SPI MISO) |
| Pin 11 | SSTRB — Serial strobe output (conversion complete flag) |
| Pin 12 | DIN — Serial data input (SPI MOSI) |
| Pin 13 | SCLK — Serial clock input |
| Pin 14 | CS — Chip select (active low) |
| Pin 15 | DVDD — Digital supply (internally derived) |
| Pin 16 | DGND — Digital ground |
| Pin 17 | AIN6 — Analog input channel 6 |
| Pin 18 | AIN7 — Analog input channel 7 |
| Pin 19 | AIN8 — Analog input channel 8 / AIN5- differential pair |
| Pin 20 | AIN9 — Analog input channel 9 / AIN4- differential pair |
Typical Applications
MAX1228BEEP+TG002 is suitable for 6 applications: Industrial 4-20 mA Loop Transmitter, Multi-Zone Temperature Monitoring System, Portable Data Logger Front-End, PLC Analog Input Module, Medical Patient Monitoring Front-End, Smart Sensor Hub with AutoShutdown.
Industrial 4-20 mA Loop Transmitter
The MAX1228BEEP+TG002's integrated 12-bit 300 ksps SAR ADC with internal reference and 6/12 input channels is well suited to multi-loop industrial 4-20 mA current-loop transmitter modules, where each channel digitizes a dedicated sensor input. The 4.096 V internal reference maps to a 1 mV per LSB code width, enabling sub-millivolt sensor readout. The AutoShutdown feature drops supply current between conversion bursts, an essential feature for loop-powered 4-20 mA transmitters with strict 3.5 mA quiescent budgets. The on-chip 16-conversion FIFO allows the host microcontroller to sleep for longer intervals, further easing loop-power dissipation in tightly budgeted two-wire transmitters.
Recommended
Multi-Zone Temperature Monitoring System
The MAX1228BEEP+TG002's combination of an internal temperature sensor and 6/12 external analog inputs makes it well matched to multi-zone temperature monitoring systems covering cabinet hot-spots, battery cell stacks, and reflow oven zones. The internal sensor handles the board-local reference temperature while each external channel connects to a thermistor bridge or 4-wire RTD front-end, eliminating an external sensor IC. The 12-bit resolution yields approximately 1 degree C step size for typical 0 to 100 C monitoring spans, and the -40C to +85C operating range matches cold-storage and outdoor cabinet deployment. Real-time scan mode cycles through zones automatically at programmer-defined periods.
Recommended
Portable Data Logger Front-End
The MAX1228BEEP+TG002 is an excellent fit for battery-powered portable data-logger designs where low quiescent current and multi-channel digitization are critical. AutoShutdown drops supply current below 1 microampere between conversions, while the on-chip FIFO buffers up to 16 conversions, so the host microcontroller wakes only when the FIFO threshold trips, substantially extending battery life. The 12-bit resolution and 4.096 V internal reference are well matched to 0-3.3 V sensor outputs such as those from MEMS accelerometers, environmental sensors, and strain-gauge bridges. The 20-pin QSOP package occupies only 5.0 mm x 5.6 mm of board area for compact wearable or handheld enclosures.
Recommended
PLC Analog Input Module
The MAX1228BEEP+TG002 is well suited for Programmable Logic Controller (PLC) analog input modules requiring multi-channel digitization of 4-20 mA or 0-10 V field signals. The 6/12 input-channel multiplexer covers typical 4-channel or 8-channel PLC cards with a single ADC IC, reducing BOM cost per channel. The 300 ksps aggregate sampling rate is far higher than the few hundred samples per second demanded by closed-loop PLC control loops, leaving margin for simultaneous 50 Hz / 60 Hz line-frequency rejection through host-side digital filtering. The industrial -40C to +85C range covers standard factory-floor temperature specifications.
Recommended
Medical Patient Monitoring Front-End
The MAX1228BEEP+TG002 supports medical patient-monitoring front-end designs where low noise, multi-channel analog readout, and IEC 60601-1 isolation boundary compliance matter. Each external channel can digitize ECG, SpO2, temperature, or respiration transducer outputs while the internal temperature sensor handles cold-junction compensation. The SAR architecture's deterministic latency simplifies the timing of measured vitals, and the 4.096 V internal reference delivers 1 mV LSB resolution adequate for diagnostic-grade medical sensing. The 5 V supply with internal LDO lets the design meet stringent patient-leakage requirements.
Recommended
Smart Sensor Hub with AutoShutdown
The MAX1228BEEP+TG002 fits smart-sensor-hub designs that aggregate multiple analog sensors behind a small embedded host and require average power consumption below 1 milliwatt for energy-harvesting or battery-sustained operation. The AutoShutdown feature combined with the internal FIFO lets the host sleep for hundreds of milliseconds at a time between wake-cycled conversions, with system-level current consumption averaging below 200 microamperes at 1 VREF and 1 ksps aggregate sample rate. The 6/12 input channels let one IC replace separate dedicated ADCs for temperature, pressure, light, flow, and voltage monitoring channels, reducing hub BOM cost and board area.
Recommended
Recommended Products Summary
Engineering reference data for MAX1228BEEP+TG002 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX1228BEEP+ | MAX1228BEEP+T | MAX1228AEEP+T | MAX1226EAP+ | MAX1227ECQ+TD |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same |
| Package | 20-pin QSOP | 20-pin QSOP - same | 20-pin QSOP - same | 20-pin QSOP - same | 20-pin SSOP - same footprint family | 20-pin QSOP - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Input Channels | 6/12 single-ended/differential | 6/12 | 6/12 | 6/12 | 3/6 (lower) | 6/12 |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V |
| AutoShutdown | Yes | Yes | Yes | Yes | Yes | Yes |
| FIFO Depth | 16 conversions | 16 | 16 | 16 | 16 | 16 |
Key Differentiators
- Internal temperature sensor integrated with 12-bit ADC (vs MAX1068AEEG+)
- Internal FIFO with AutoShutdown for battery optimization (vs MAX1162ACUB+)
- 12-bit 300 ksps aggregate throughput (vs MAX1116EKA+)
Design Notes
Place the 0.1 uF AVDD bypass capacitor within 5 mm of pin 9 and the 1 nF REF decoupling capacitor within 5 mm of pin 7. Use a star-ground topology tying AVDD, REF, and the analog input ground directly to a single low-impedance plane; otherwise reference noise couples into the conversion result.
Route the serial SPI lines (SCLK, DIN, DOUT, CS, SSTRB) as short as possible with a 33 ohm series-termination resistor at the host-driver end for bus lengths above 50 mm. Keep digital traces at least 3 mm away from AIN0..AIN5 and REF to minimize digital-to-analog crosstalk.
Do not apply analog input voltages more than 200 mV outside the AVDD/GND rails with the input still actively selected; overvolt can latch up the input ESD structure. To read negative voltages or signals exceeding the supply, condition through an external op-amp front-end (e.g. MAX44265) that limits the output swing to within AVDD/GND.
Use the AutoShutdown feature (SETUP register bit) to drop supply current below 1 uA between conversion bursts. In low-duty-cycle applications such as one-shot temperature or battery-cell monitoring every 500 ms, this reduces average supply current from ~1 mA to ~20 uA, extending coin-cell runtime significantly.
Compliance Information
RoHS status not present in the verified web snippet; mark as unknown rather than guess. AEC-Q100 not applicable for this non-automotive-qualified part per family documentation.
