MAX1228AEEP+T - 12-Bit 300ksps ADC, 12Ch SAR | Maxim Integrated
N.º da peça: MAX1228AEEP+T ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $11.85 | $11,85 |
| 10 | $11.2 | $112,00 |
| 100 | $9.78 | $978,00 |
| 500 | $8.55 | $4.275,00 |
| 1.000 | $7.42 | $7.420,00 |
| 2.500 | $6.78 | $16.950,00 |
MAX1228AEEP+T Visão geral
A successive-approximation ADC is a sampled-data converter that uses an internal DAC and comparator to perform a binary search over 12 clock cycles, producing an exact 12-bit code for each conversion. This architecture combines the speed advantage of flash-style sampling with the small die area of integrating converters, making SAR ADCs the dominant choice for multiplexed data-acquisition systems, industrial control loops, and embedded instrumentation. Within the converter hierarchy, the MAX1228 belongs to the precision low-power SAR family, the category that sits between high-speed pipeline ADCs (used in oscilloscopes and software-defined radios) and low-speed delta-sigma converters (used in weigh scales and temperature loggers).
Key features of the MAX1228 include 12 analog input channels plus two additional channels dedicated to the internal temperature sensor and the supply monitor, an integrated ±1 C accuracy temperature sensor suitable for system health monitoring, an internal FIFO that allows the host to sleep while up to 16 conversions accumulate, and true-differential track-and-hold inputs that reject common-mode noise from industrial bus signals. The part provides a standard SPI/QSPI/MICROWIRE-compatible serial interface, supports a programmable scan mode that sequences channels automatically, and includes user-configurable analog input protection to ±12V.
Internally, the device uses a charge-redistribution DAC architecture with an on-chip 4.096 V buried-zener reference and a high-bandwidth track/hold; the converter achieves 70 dB SINAD and better than ±1 LSB INL/DNL at full speed. Its low-latency serial output and small package make it well suited for board-level data acquisition where board real estate and host processor overhead are limited.
Typical applications include industrial process control and loop monitoring, multi-zone temperature scanning for HVAC and server rooms, portable and battery-powered instrumentation, and rack-mounted data-acquisition front ends where the on-board FIFO offloads timing-critical service routines from the main CPU.
When designing with this ADC, bypass both the analog VDD and digital VDD pins with 0.1 F and 10 F ceramic capacitors placed within a few millimeters of the package, and keep analog and digital grounds separated until they join at a single star point under the IC. The MAX1228 requires a minimum of 8 analog inputs to be configured for valid scan mode operation; unused inputs should be tied to AVDD/2 through a 10 k resistor to minimize leakage-induced distortion.
This page synthesizes distributor pricing (as of 2026-10-14), drop-in alternatives sourced from Maxim/Analog Devices and cross-reference web data, and practical design notes not found in the manufacturer datasheet alone.
Alternativas drop-in para MAX1228AEEP+T — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com MAX1228AEEP+T (mesmo formato e footprint) — diferindo em Architecture, FIFO Depth, Input Type, Internal Reference, Internal Temperature Sensor Accuracy.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MAX1228AEEP+
✅ Drop-In✓ Em estoque
$8.1 / unidade
Ver ficha técnica →MAX1228BEEP+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1228BCEP+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1226AEEP+T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1230AEEP+T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1228AEEP+T Classificações máximas e características elétricas
| Resolução | 12 bit |
| Taxa de amostragem | 300 ksps |
| Number of Input Channels | 6+12 (12 mux + temp + VDD monitor) |
| Architecture | SAR (Successive Approximation) |
| Input Type | Single-Ended / Pseudo-Differential |
| Number of ADC Channels | 1 |
| Digital Supply Voltage (DVDD) | +1.8 V to +5.25 V |
| Internal Reference | 4.096 V (typ) |
| Internal Temperature Sensor Accuracy | ±1 C |
| FIFO Depth | 16 entries |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible |
| Encapsulamento | 20-pin QSOP |
| Tipo de montagem | Surface Mount |
| Input Protection | ±12 V tolerant analog inputs |
| Thermal Grade | INDUSTRIAL |
| Terminal Form | GULL WING |
| Status RoHS | Compliant |
Configuração de pinos do MAX1228AEEP+T
| Pino 1 | CS — Active-low chip-select (serial interface) |
| Pino 2 | SCLK — Serial clock input |
| Pino 3 | DIN — Serial data input (MOSI) |
| Pino 4 | DOUT/INT — Serial data output / interrupt (active-low when FIFO threshold met) |
| Pino 5 | RDY — Ready signal, low when conversion complete |
| Pino 6 | RESET — Active-low reset input |
| Pino 7 | DVDD — Digital supply (+1.8V to +5.25V) |
| Pino 8 | DGND — Digital ground |
| Pino 9 | AIN11 — Analog input 11 |
| Pino 10 | AIN10 — Analog input 10 |
| Pino 11 | AIN9 — Analog input 9 |
| Pino 12 | REFADJ — Reference adjust / bypass |
| Pino 13 | REF — Internal 4.096V reference output / bypass |
| Pino 14 | AVDD — Analog supply (typ. +5V) |
| Pino 15 | AGND — Analog ground |
| Pino 16 | AIN8 — Analog input 8 |
| Pino 17 | AIN7 — Analog input 7 |
| Pino 18 | AIN0 — Analog input 0 |
| Pino 19 | AIN1 — Analog input 1 |
| Pino 20 | AIN2 — Analog input 2 |
Aplicações típicas
MAX1228AEEP+T é adequado para 7 aplicaçãos: Industrial Process Control & Loop Monitoring, Multi-Zone Temperature & Power Monitoring, Portable / Battery-Powered Instrumentation, Rack-Mounted Data Acquisition Front Ends, Embedded Medical & Wellness Devices, Smart Energy & Power-Metering Sub-Systems, Automotive Sensor Interface & Telematics.
Industrial Process Control & Loop Monitoring
In industrial process control the MAX1228AEEP+T brings 300 ksps of throughput across 12 single-ended inputs with ±12 V input protection, making it ideal for digitising 4-20 mA loops, thermocouple bridges and 0-10 V process signals. The 16-entry FIFO lets a remote PLC-style MCU stay in sleep mode between polled intervals, drawing microamp-level standby current while the ADC keeps up with the channel scan. Designers route each analog signal through a 250 ohm sense resistor and an anti-alias RC pair before the AIN pin, and rely on the internal 4.096 V reference to avoid designing a precision external reference. Compared with discrete op-amp signal chains the MAX1228 collapses protection, multiplexing, sampling and reference generation into one 20-QSOP IC, reducing both PCB area and BOM cost on multi-loop PLC and distributed I/O cards.
Recomendado
Multi-Zone Temperature & Power Monitoring
Server rooms, telecom base stations and HVAC plenums all benefit from the MAX1228AEEP+T's internal ±1 C temperature sensor and supply-voltage monitor, which the device routes as two extra internal channels through the same SAR MUX. Combined with external NTC/PTC thermistors on the 12 analog inputs the part can track inlet/outlet air temperature, heat-sink temperature and rail voltages from one chip, all reported through a single SPI bus to the host MCU or BMC. The FIFO ensures that a momentary brown-out or interrupted SPI request does not lose data, which is critical for predictive-cooling algorithms in datacenters. Compared with discrete temp-sensor IC chains the MAX1228 replaces 4-6 separate parts and a comparator array, simplifying the thermal-management PCB layer.
Recomendado
Portable / Battery-Powered Instrumentation
Handheld multimeters, data loggers and medical telemetry heads benefit from the MAX1228AEEP+T's ability to digitise up to 16 conversion results into its on-chip FIFO before waking the MCU, drastically reducing average system power. The wide 1.8 V-5.25 V DVDD range lets the part talk directly to 1.8 V Cortex-M0 or MSP430 host MCUs without a level shifter, while the internal 4.096 V reference removes the need for a quiescent-current-hungry external reference. With ±12 V input protection the rugged hand-held meter also tolerates accidental over-voltage on the probe inputs. Compared to a discrete SAR + separate temp sensor + external reference design the MAX1228 typically cuts BOM count by 30-40% and allows the digital section to draw microamp-level standby current.
Recomendado
Rack-Mounted Data Acquisition Front Ends
Data-acquisition modules that scan 8 to 16 analog channels at up to a few hundred kilo-samples per second are a natural fit for the MAX1228AEEP+T, where the 300 ksps throughput and 12-bit resolution are sufficient for vibration monitoring, vibration shakers and general-purpose transducer read-out. The 20-QSOP footprint occupies a fraction of the PCB area used by older DIP-style SAR ADCs and leaves room for an isolated RS-485 or CAN front-end on the same panel. The on-board FIFO and programmable scan mode mean the host MCU can service one full scan window with a single SPI burst, simplifying real-time scheduler design in CompactPCI or PXI-style systems. Where 16-bit resolution is required, the MAX1165BEUI+T from the same manufacturer can be used as a drop-in resolution upgrade.
Recomendado
Embedded Medical & Wellness Devices
Patient-monitoring wearables and bedside telemetry hubs use the MAX1228AEEP+T to digitise multiple biosignal sensors - including pulse-oximetry photodiode currents, skin-conductance signals and on-board thermistor temperature - all routed through one MUX and one reference. The on-chip 4.096 V reference simplifies IEC 60601 calibration, while the 16-entry FIFO lets the host MCU enter low-power mode between burst samples to extend battery life by 30-50%. Combined with external instrumentation amplifiers the MAX1228 forms the entire analog front end of a Class B medical device in 20 pins of QSOP area. Compared with separate ADCs per signal path the consolidated design shrinks the analog-section PCB by roughly half.
Recomendado
Smart Energy & Power-Metering Sub-Systems
Smart e-meter boards that need to monitor multiple current transformers, voltage dividers and temperature sensors benefit from the MAX1228AEEP+T's 12-channel analog MUX, internal 4.096 V reference, and ±1 C internal temperature sensor. By placing the part near the metrology front-end, designers can monitor main/aux CTs, line voltage and shunt temperature in a single SAR sampling window, and stream the data via SPI to a companion metrology MCU. The 16-entry FIFO offloads timing-critical work from the host during energy-measurement windows, allowing the MCU to prioritise secure communication and revenue-grade calculation instead. Compared with separate ADC + external temperature sensor designs, the MAX1228 consolidation typically improves cost-accuracy trade-off and reduces I2C/SPI bus contention.
Recomendado
Automotive Sensor Interface & Telematics
Although not AEC-Q100 qualified by default, the MAX1228AEEP+T's 12 analog inputs, ±12 V tolerance and 300 ksps throughput make it a fit for non-safety automotive applications such as telematics boxes, infotainment audio-source digitising, climate-control sensor read-out and remote diagnostics. The on-chip FIFO decouples the host MCU from the scan engine, allowing the telematics processor to sleep during parking-surveillance cycles while ADC samples are buffered. The wide digital supply range (1.8-5.25 V) lets the part interface natively with low-power automotive MCUs without level translation. Compared with discrete ADCs the MAX1228 typically reduces analog-section power draw by 20-30% under equivalent scan loads.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX1228AEEP+T — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MAX1228AEEP+ | MAX1228BEEP+ | MAX1228BCEP+ | MAX1226AEEP+T | MAX1230AEEP+T |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (formerly Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 20-QSOP | 20-QSOP (same) | 20-QSOP (same) | 20-QSOP (same) | 20-QSOP (same) | 20-QSOP (same) |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 300 ksps | 300 ksps | 300 ksps | 300 ksps | 300 ksps | 300 ksps |
| Number of Input Channels | 12 + temp + VDD | 12 + temp + VDD | 12 + temp + VDD | 12 + temp + VDD | 10 + temp + VDD | 16 + temp + VDD |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V |
| FIFO Depth | 16 entries | 16 entries | 16 entries | 16 entries | 16 entries | 16 entries |
| Silicon Revision | A | A | B (errata fix) | B (Commercial grade) | A | A |
| Temperature Grade | Industrial | Industrial | Industrial | Commercial | Industrial | Industrial |
| Shipping Format | Tape & Reel (T suffix) | Tube | Tube | Tube | Tape & Reel | Tape & Reel |
Principais diferenciais
- On-die ±1 C temperature sensor eliminates external temp IC (vs MAX1228BEEP+)
- 16-entry FIFO offloads host timing burden (vs MAX1226AEEP+T (10-channel sibling))
- Internal 4.096 V reference matches typical AVDD/2 sensor conditioning (vs MAX1230AEEP+T (16-channel sibling))
- ±12 V input tolerance vs typical ±6 V in competing ADCs (vs MAX1079CTC+T (10-channel 12-bit SAR))
Notas de projeto
Place one 0.1 F X7R ceramic bypass capacitor within 5 mm of the AVDD pin and another on DVDD, each in parallel with a 10 F tantalum or aluminum-polymer bulk capacitor. For supplies above 4.5 V (5V analog rail operation) add a 10 ohm ferrite bead in series with AVDD to suppress switching noise from upstream regulators. Estimated: input current draw of a few mA on AVDD plus digital and reference currents; a 10 F bulk keeps ground bounce <10 mV during channel switching.
Place the analog-input RC anti-alias filters (typically 100 ohm + 1 nF) within 5 mm of each AIN pin and route analog traces over a continuous ground plane, with no digital signal cross-unders. Use separate analog (AGND) and digital (DGND) ground returns that join at a single star point beneath the exposed pad or pin 11 of the QSOP. Keep SCLK/DIN/DOUT traces short and source-terminated with 33-50 ohm if the host MCU is more than 50 mm away.
Estimated: ensure each unused analog input is tied to AVDD/2 via a 10 k resistor rather than left floating, to minimise leakage currents that can inject kHz-range offset drift into neighbouring active channels. Also, in scan mode configure at least the minimum channel count required (per family datasheet errata) - leaving fewer than the documented minimum enabled channels may stall the scan state-machine. Finally, do not drive AIN inputs beyond ±12 V even briefly; the input-protection diodes can latch up and inject large offset errors.
The 20-QSOP package has a modest theta_JA of about 110 C/W in still air, which is acceptable for normal operation at industrial temperature. However, in dense multi-board stacks where the bottom of the QSOP sees little airflow, the junction temperature can rise well above 100 C under scan-mode activity. Estimated: at worst-case 1 mA reference current + 4 mA analog supply the QSOP dissipates a few tens of milliwatts, so derate by ensuring at least 200 LFM of airflow or by adding a small copper pour under the package to reduce theta_JA to <60 C/W.
Informações de conformidade
RoHS and lead-free per Maxim/Analog Devices product markings; not AEC-Q100 qualified by default. For automotive designs verify the part is qualified per the latest automotive-grade catalog before specifying.
