MAX1296AEEG - 420ksps 12-Bit 2-Ch ADC +2.5V Ref | Maxim Integrated
N.º da peça: MAX1296AEEG ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $9.45 | $9,45 |
| 10 | $8.52 | $85,20 |
| 100 | $7.54 | $754,00 |
| 500 | $6.78 | $3.390,00 |
| 1.000 | $6.05 | $6.050,00 |
MAX1296AEEG Visão geral
What is a successive-approximation register (SAR) ADC? An SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm against an internal DAC to digitize an input voltage one bit per clock cycle. SAR ADCs occupy the middle of the converter taxonomy between flash (fastest, lowest resolution) and sigma-delta (slowest, highest resolution). The MAX1296AEEG's 420 ksps throughput is typical of mid-resolution SAR ADCs, while its 12-bit resolution positions it above 10-bit mid-tier devices and below 14-/16-bit precision parts.
Key features include 420 ksps sampling rate, 12-bit resolution with ±0.5 LSB DNL/INL, internal +2.5 V reference (typically ±1.5% initial accuracy), single +5 V analog supply operation, low power dissipation of approximately 8.3 mA at full speed, and hardware/ software power-down modes that drop quiescent current below 1 µA. The MAX1296AEEG also includes an active-low INT output that tri-states when CS goes high, allowing direct connection to shared microcontroller buses without external glue logic.
The architecture combines an input track-and-hold, a charge-redistribution DAC, and a precision comparator with on-chip calibration registers. Power-down is initiated either through hardware (active-low SHDN) or by software command; the internal reference is preserved in software power-down but lost in hardware shutdown. The QSOP-24 footprint occupies roughly 60% of the board area of a standard SO-24, making the part suitable for compact instrument designs where PCB real estate is limited.
Typical applications include data-acquisition systems, pen-digitizers and tablet digitizing surfaces, panel meters, portable industrial instrumentation, and medical monitoring front ends. The wide analog input range (0 to VREF or pseudo-differential ±REF) is well-suited to transducer conditioning.
When designing with this part, place the 0.1 µF bypass capacitor on AVDN as close to the pin as possible and keep digital traces away from the analog inputs to avoid coupling. The MAX1295/MAX1297 are pin-compatible +3 V variants for systems with lower supply rails.
Alternativas drop-in para MAX1296AEEG — 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 MAX1296AEEG (mesmo formato e footprint) — diferindo em Architecture, Resolution, Operating Temperature Range, RoHS Status, Internal Reference Voltage.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MAX1296AEEG+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1296ACEG+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1296ACEG-T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1297AEEG+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX1068AEEG+
✅ Drop-In✓ Em estoque
$7.48 / unidade
Ver ficha técnica →MAX1296AEEG Classificações máximas e características elétricas
| Resolução | 12 bit |
| Taxa de amostragem | 420 ksps |
| Number of Input Channels | 2 single-ended / 1 pseudo-differential |
| Architecture | SAR (Successive Approximation Register) |
| Conversion Type | 1 SAR, 1 input per conversion |
| Supply Voltage (Analog) | +5 V single supply |
| Internal Reference Voltage | +2.5 V |
| Linearity (DNL/INL) | ±0.5 LSB |
| Data Interface | Parallel (word access) |
| Faixa de tensão de entrada | 0 to VREF / pseudo-diff ±REF |
| Faixa de temperatura de operação | -40 °C to +85 °C |
| Package / Pin Count | 24-pin QSOP |
| Tipo de montagem | Surface Mount |
| Supply Current (Active) | 8.3 mA typical |
| Corrente de desligamento | < 1 µA |
| Status RoHS | Compliant |
Configuração de pinos do MAX1296AEEG
| Pino 1 | AGND — Analog ground return |
| Pino 2 | AIN0 — Analog input channel 0 |
| Pino 3 | AIN1 — Analog input channel 1 |
| Pino 4 | REF — Reference I/O (internal +2.5V or external drive) |
| Pino 5 | AVDN — Analog supply +5V |
| Pino 6 | AGND — Analog ground |
| Pino 7 | active-low SHDN — Hardware shutdown (active low) |
| Pino 8 | DGND — Digital ground |
| Pino 9 | DVDD — Digital supply (+5V or +3V with level shifter) |
| Pino 10 | D0 — Data bit 0 (LSB) |
| Pino 11 | D1 — Data bit 1 |
| Pino 12 | D2 — Data bit 2 |
| Pino 13 | D3 — Data bit 3 |
| Pino 14 | D4 — Data bit 4 |
| Pino 15 | D5 — Data bit 5 |
| Pino 16 | D6 — Data bit 6 |
| Pino 17 | D7 — Data bit 7 |
| Pino 18 | D8 — Data bit 8 |
| Pino 19 | D9 — Data bit 9 |
| Pino 20 | D10 — Data bit 10 |
| Pino 21 | D11 — Data bit 11 (MSB) |
| Pino 22 | active-low INT — Interrupt output (active low) |
| Pino 23 | active-low RD — Read strobe (active low) |
| Pino 24 | active-low CS — Chip select (active low) |
Aplicações típicas
MAX1296AEEG é adequado para 7 aplicaçãos: Data Acquisition Systems, Pen-Digitizer / Tablet Digitizing Surface, Panel Meters and Digital Voltmeters, Portable Industrial Instrumentation, Medical Monitoring Front Ends, Process Control and Industrial Sensors, Automotive Sensor Signal Conditioning.
Data Acquisition Systems
The MAX1296AEEG delivers 12-bit resolution at 420 ksps, ideal for multi-channel data-acquisition front ends sampling slow-to-medium-rate analog signals such as temperature, pressure, and strain-gauge outputs. Its integrated input MUX, +2.5 V reference, and parallel interface eliminate external glue logic, allowing direct connection to an 8-/16-bit microcontroller data bus. Compared with discrete ADC designs, the MAX1296AEEG reduces BOM count by roughly 3-5 components and PCB area by 30-40%, while the SAR architecture guarantees no-pipeline-delay conversion for multiplexed input sequences.
Recomendado
Pen-Digitizer / Tablet Digitizing Surface
Original-equipment-manufacturers (OEMs) of pen-digitizer tablets rely on the MAX1296AEEG for its combination of 12-bit positional resolution and 420 ksps throughput to digitize stylus position at high update rates. The pseudo-differential input mode rejects ground bounce from the inductive pen-coil sensing front end, while the parallel interface feeds coordinates directly to the display controller without I2C/SPI arbitration latency. The internal +2.5 V reference provides a stable digitizing scale, and shutdown current below 1 µA extends battery life in portable digitizing tablets.
Recomendado
Panel Meters and Digital Voltmeters
Front-panel digital meters use the MAX1296AEEG to digitize voltage, current, or process inputs at 12-bit precision with a 2-channel MUX supporting differential measurements. The integrated +2.5 V reference eliminates an external precision reference IC, reducing BOM cost and improving calibration stability over temperature. The MAX1296AEEG's wide -40 °C to +85 °C operating range supports industrial panel-meter installations. Standby current below 1 µA enables battery-backed meters to retain calibration logs for years on a single coin cell.
Recomendado
Portable Industrial Instrumentation
Handheld multimeters, insulation testers, and process calibrators employ the MAX1296AEEG for its 420 ksps burst-mode sampling combined with sub-µA shutdown current. Engineers benefit from the 24-pin QSOP's compact footprint, freeing PCB space for transducer signal conditioning and isolated I/O. The +5 V single-supply operation simplifies battery-boosted designs, and the integrated reference removes the need for a separate precision shunt regulator. Compared with older 12-bit ADCs, the MAX1296AEEG's >85 dB SINAD at full speed supports 4-1/2 digit DMM accuracy.
Recomendado
Medical Monitoring Front Ends
Patient-monitoring equipment such as spot-check pulse oximeters and ambulatory ECG holters require low-power, mid-resolution conversion of biopotential signals. The MAX1296AEEG's 2-channel pseudo-differential input stage pairs naturally with instrumentation amplifiers to capture differential electrode signals while rejecting common-mode line-noise interference. Its SAR architecture imposes zero pipeline delay, critical for real-time cardiac monitoring where late-arriving samples would distort heart-rate detection. The internal reference and integrated MUX reduce board size and EMI susceptibility compared with discrete solutions.
Recomendado
Process Control and Industrial Sensors
PLC analog input modules and 4-20 mA loop-powered transmitters use the MAX1296AEEG to digitize process variables such as flow rate, level, and temperature. The pseudo-differential input simplifies loop-ground-loop rejection, while the parallel interface allows direct connection to industrial microcontrollers such as the MAXQ or Z80 family. The wide operating temperature range of -40 °C to +85 °C supports outdoor control-cabinet deployments. With shutdown current below 1 µA, the part supports loop-powered 4-20 mA transmitters that must operate from 3.5 mA minimum loop current.
Recomendado
Automotive Sensor Signal Conditioning
Automotive telematics and sensor-interface modules deploy the MAX1296AEEG for digitizing sensor signals such as throttle position, MAP pressure, and battery current. Its wide operating temperature range (-40 °C to +85 °C standard, with -40 °C to +125 °C extended screening available) supports under-dash and engine-compartment installations. The integrated reference and MUX reduce ECU board complexity, and the parallel interface accommodates legacy automotive microcontrollers with conventional data-bus architectures. Designers targeting AEC-Q100 qualification should evaluate the MAX1292 series or consult Maxim for automotive-grade screening options.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX1296AEEG — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MAX1296AEEG+ | MAX1296ACEG+ | MAX1296ACEG-T | MAX1297AEEG+ | MAX1068AEEG+ |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 24-pin QSOP | 24-pin QSOP - same | 24-pin SSOP | 24-pin SSOP | 24-pin QSOP - same | 24-pin QSOP - same |
| Sampling Rate | 420 ksps | 420 ksps | 420 ksps | 420 ksps | 400 ksps (3V spec) | 200 ksps |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Supply Voltage | +5V | +5V | +5V | +5V | +3V | +5V |
| Input Channels | 2 SE / 1 PD | 2 SE / 1 PD | 2 SE / 1 PD | 2 SE / 1 PD | 2 SE / 1 PD | 8 SE / 4 PD |
| Internal Reference | +2.5V | +2.5V | +2.5V | +2.5V | +2.5V | +2.5V |
| Data Interface | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel/SPI selectable |
| RoHS Compliance | No (Pb-containing) | Yes | Yes | Yes | Yes | Yes |
Principais diferenciais
- Highest throughput among 24-pin QSOP 12-bit ADCs in the MAX129x family (vs MAX1068AEEG+)
- Pin-compatible +5V/+3V migration path (vs MAX1297AEEG+)
- Internal +2.5V reference eliminates external precision reference IC (vs MAX1060AEEI+)
Notas de projeto
Estimated: at +5 V supply, 420 ksps continuous sampling, and full-scale input, the MAX1296AEEG draws approximately 8.3 mA active and dissipates around 41.5 mW. For battery-powered designs, use hardware SHDN (active low) to drop quiescent current below 1 µA between conversion bursts. Place a 0.1 µF ceramic bypass capacitor on AVDN within 3 mm of the pin and a 10 µF bulk capacitor near the supply entry point to handle the sample-and-hold charging transients.
Separate analog and digital ground planes and join them only at the AGND/DGND pins of the MAX1296AEEG. Keep digital data-bus traces (D0-D11) and control signals (active-low CS, active-low RD) routed away from AIN0/AIN1/REF traces. The QSOP-24 lead pitch is 0.025 inch, so use 0.4-0.5 mm trace-and-space on the PCB and 4-layer stack-up with dedicated VCC/AGND/DGND planes to keep digital-to-analog coupling below 1 LSB at full throughput.
Avoid driving REF with an external reference unless you disable the internal reference via software command - the part cannot operate with both internal and external references simultaneously, which causes reference contention. When using pseudo-differential inputs, ensure the common-mode voltage stays within the AVDN-AGND rails. Finally, do not leave active-low SHDN floating; tie it high through a 100 kΩ pull-up to AVDN or low through 100 kΩ to AGND to guarantee a known idle mode at power-up.
Informações de conformidade
MAX1296AEEG (no 'Plus' suffix) is the Pb-containing legacy variant per Maxim/ADI ordering scheme. The RoHS-compliant version is MAX1296AEEG+. Reach -73 +1 REACH SVHC compliant per Maxim/ADI declaration. AEC-Q100 qualification not available on standard part; contact Maxim for automotive-grade screening options.
