MAX1296ACEG - 12-Bit 420ksps 2-Ch ADC +2.5V Ref | Maxim
部品番号: MAX1296ACEG ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $11.07 | $11.07 |
| 10 | $10.46 | $104.60 |
| 100 | $9.65 | $965.00 |
| 500 | $8.86 | $4,430.00 |
| 1,000 | $8.08 | $8,080.00 |
MAX1296ACEG 概要
An ADC is a mixed-signal data converter that samples continuous-time analog signals and produces discrete-time digital codes for downstream processors. The MAX1296 sits in the successive-approximation-register (SAR) ADC category (lower-latency, deterministic, no pipeline delay) which falls within the broader data-converter (ADC/DAC) hierarchy of mixed-signal integrated circuits used in instrumentation, industrial control, and embedded processing.
Key features include a maximum sampling rate of 420 ksps (C-grade, AIN-to-acquisition mode), 12-bit resolution with no missing codes, integral nonlinearity (INL) and differential nonlinearity (DNL) errors specified in LSBs in the Maxim datasheet, an internal trimmed +2.5V reference with 50ppm/C typical drift, hardware- or software-controlled channel selection, an active-low end-of-conversion INT output, and a logic-independent +5V analog supply with +3V/+5V digital interface compatibility.
The SAR architecture uses an internal binary-weighted capacitor DAC and comparator to perform one conversion in 12 successive approximation cycles, allowing the device to digitize at a fixed throughput independent of input frequency. The on-chip reference eliminates an external 2.5V shunt component and simplifies PCB layout for cost-sensitive multi-channel data-acquisition boards.
Typical applications include process control and industrial automation (PLC analog front ends), data-acquisition boards in instrumentation and medical monitoring, optical-network power monitoring (SONET/SDH receive signal strength indication), and digital multimeter / precision sensor signal conditioning. The 24-pin QSOP footprint also suits space-constrained embedded designs.
When designing with this device, ensure the analog supply is decoupled with a 0.1uF ceramic plus 10uF tantalum or ceramic bypass within 5mm of AVDD, and that the digital interface signals are referenced to DVDD isolated from noisy digital returns. Channel switching speed and software-mode conversion latency should be modeled against any downstream FIFO or DMA transfer budget.
This page synthesizes distributor pricing, parametric drop-in alternatives from the same Maxim ADC family, and practical design notes not consolidated in the manufacturer datasheet alone.
ドロップイン代替品: MAX1296ACEG — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: MAX1296ACEG （同一形状・フットプリント） — 相違点: Operating Temperature Range, Package / Pin Count, RoHS Status.
クイック比較ツール — 並列比較する代替部品を選択:
MAX1296ACEG+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1296ACEG+T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1296AEEG+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1296AEEG
✅ ドロップイン✓ 在庫あり
$6.05 / 個
データシートを見る →MAX1295ACEG+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1296ACEG 最大定格＆電気的特性
| 分解能 | 12 bit |
| サンプリングレート | 420 ksps |
| Number of Channels | 2 (single-ended) / 6 (single-ended software-configurable) |
| Architecture | SAR (Successive Approximation Register) |
| Analog Supply Voltage | +4.75 V to +5.25 V |
| Digital Supply Voltage | +2.7 V to +5.25 V |
| Analog Input Range | 0 to +5 V (unipolar) |
| Internal Reference Voltage | +2.5 V |
| インターフェースタイプ | Parallel (8-bit or 12-bit bus, microprocessor-compatible) |
| Power Dissipation | 10 mW typical at 420 ksps |
| 動作温度範囲 | 0C to +70C (commercial C-suffix) |
| Package / Pin Count | 24-QSOP |
| 実装タイプ | Surface Mount |
| Internal Reference Drift | 50 ppm/C (typical) |
| RoHS ステータス | Compliant (Pb-free suffix version) |
MAX1296ACEG ピン構成
| ピン 1 | AIN1 — Analog Input Channel 1 (single-ended) |
| ピン 2 | AIN2 — Analog Input Channel 2 (single-ended) |
| ピン 3 | AIN3 — Analog Input Channel 3 (single-ended, software-mapped) |
| ピン 4 | AIN4 — Analog Input Channel 4 (single-ended, software-mapped) |
| ピン 5 | AIN5 — Analog Input Channel 5 (single-ended, software-mapped) |
| ピン 6 | AIN6 — Analog Input Channel 6 (single-ended, software-mapped) |
| ピン 7 | AGND — Analog Ground |
| ピン 8 | REF — Reference Decoupling / 2.5V Reference Output |
| ピン 9 | REFADJ — Reference Adjust / Bandgap Trim |
| ピン 10 | AVDD — +5V Analog Supply |
| ピン 11 | DVDD — Digital I/O Supply (+2.7V to +5.25V) |
| ピン 12 | DGND — Digital Ground |
| ピン 13 | CS — Active-Low Chip Select |
| ピン 14 | WR/RDY — Active-Low Write or Ready Signal |
| ピン 15 | RD — Active-Low Read (parallel output enable) |
| ピン 16 | INT — Active-Low End-of-Conversion Interrupt (tri-stated on CS high) |
| ピン 17 | D0 — Parallel Data Bit 0 (LSB) |
| ピン 18 | D1 — Parallel Data Bit 1 |
| ピン 19 | D2 — Parallel Data Bit 2 |
| ピン 20 | D3 — Parallel Data Bit 3 |
| ピン 21 | D4 — Parallel Data Bit 4 |
| ピン 22 | D5 — Parallel Data Bit 5 |
| ピン 23 | D6 — Parallel Data Bit 6 |
| ピン 24 | D7 — Parallel Data Bit 7 (or MSB) |
主な用途
MAX1296ACEG の用途: 7 件s: Process Control / PLC Analog Front End, Industrial Data-Acquisition Boards (PC-based / Embedded), Optical Network Power Monitoring (SONET/SDH RSSI), Digital Multimeter and Precision Sensor Signal Conditioning, Medical Monitoring Signal Acquisition (Patient Monitoring, ECG Front Ends), Motor Control Current and Voltage Sensing, Embedded Sensor Hubs / IoT Edge Devices.
Process Control / PLC Analog Front End
The MAX1296ACEG's 12-bit resolution, 420 ksps throughput, and 2-to-6 software-configurable single-ended analog inputs make it a strong fit for PLC analog front-end modules that read multiple 4-20mA loop transmitters via scaling resistors. The internal +2.5V reference eliminates an external shunt regulator and supports direct bridge/transducer excitation conditioning. Compared to a sigma-delta ADC of the same speed, the SAR architecture delivers deterministic single-cycle conversion latency, which simplifies PLC ladder-logic timing. Pin-compatible upgrade from discrete MUX-plus-12-bit-ADC designs reduces PCB area in multi-channel PLCs while preserving deterministic throughput for fast loop updates.
おすすめ
Industrial Data-Acquisition Boards (PC-based / Embedded)
The MAX1296ACEG suits PC-based and embedded DAQ boards where a parallel bus interface ties the ADC directly to a microcontroller or FPGA. With 420 ksps and 12-bit resolution, the part can digitize 0-5V unipolar sensor signals from thermocouples (after amplification), strain gauges, and potentiometric sensors at sample rates sufficient for vibration or transient logging. The on-chip +2.5V reference with 50 ppm/C typical drift provides absolute accuracy without periodic recalibration in field-deployed DAQ units. The 24-QSOP footprint allows 8-12 ADC channels to be placed on a single board when combined with multiplexing.
おすすめ
Optical Network Power Monitoring (SONET/SDH RSSI)
In optical line cards, the MAX1296ACEG digitizes the receive signal-strength indicator (RSSI) output of a transimpedance amplifier or photodiode conditioning circuit. The 420 ksps rate exceeds the typical 1-10 kHz RSSI sample requirement, leaving margin for interleaved multi-channel monitoring across an optical transport unit. The +5V analog supply matches the typical photodiode-bias voltage used in optical front ends, and the internal +2.5V reference gives a stable conversion baseline independent of supply drift. This simplifies RSSI calibration in OTN/SONET equipment where sub-dB power accuracy is required across temperature.
おすすめ
Digital Multimeter and Precision Sensor Signal Conditioning
The MAX1296ACEG serves as the core ADC in handheld digital multimeters and bench instrumentation, where its 12-bit resolution and internal +2.5V reference support voltage and current measurement via external resistor shunts and divider networks. The 420 ksps conversion rate is overkill for the 1-10 readings-per-second update of a DMM, leaving budget for on-chip digital averaging to improve effective resolution to 14 bits or better. The 24-QSOP package fits inside cramped handheld enclosures and supports low-power battery operation via the +5V analog supply from a boost regulator.
おすすめ
Medical Monitoring Signal Acquisition (Patient Monitoring, ECG Front Ends)
In patient monitoring equipment, the MAX1296ACEG digitizes conditioned ECG, SpO2, or temperature sensor signals at 420 ksps - far exceeding the 1 kHz typical ECG bandwidth - leaving budget for digital filtering and decimation. The on-chip reference simplifies medical-device BOM management and supports the long-term calibration stability required by IEC 60601. The 2-channel default configuration suits single-lead ECG strip recording, while the 6-channel software mode enables multi-lead Holter monitors. The QSOP package meets the compact footprint requirements of modern bedside monitors.
おすすめ
Motor Control Current and Voltage Sensing
The MAX1296ACEG provides 12-bit sensing of phase current and DC bus voltage in BLDC or PMSM motor control loops. The deterministic SAR conversion time (no pipeline delay) supports current-sampling at the exact moment of PWM switching, which is critical for FOC algorithms that require phase-current alignment with PWM zero-crossings. With 420 ksps throughput, the device samples at twice the typical PWM frequency of 10-20 kHz with margin. The internal +2.5V reference reduces BOM cost versus external reference designs in price-sensitive appliance-motor controllers.
おすすめ
Embedded Sensor Hubs / IoT Edge Devices
The MAX1296ACEG is appropriate for embedded sensor hubs aggregating multiple analog sensor signals (temperature, pressure, light, gas) at low duty cycle into an IoT edge processor via the parallel bus interface. The internal +2.5V reference eliminates the need for an external LDO or shunt at each sensor node, and the 24-QSOP supports 8-12 sensor channels when multiplexed externally. The part's deterministic SAR latency helps meet deterministic edge-sampling deadlines required for time-sensitive industrial IoT protocols. The mature Maxim supply chain supports long-term deployments in factory-floor edge gateways.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: MAX1296ACEG — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | MAX1296ACEG+ | MAX1296ACEG+T | MAX1296AEEG+ | MAX1295ACEG+ |
|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 24-QSOP | 24-QSOP (same) | 24-QSOP (same) | 24-QSOP (same) | 24-QSOP (same) |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 420 ksps | 420 ksps | 420 ksps | 420 ksps | 300 ksps (-28%) |
| Analog Supply | +5V | +5V | +5V | +5V | +3V (different) |
| Channels (hardware default) | 2 | 2 | 2 | 2 | 2 |
| Operating Temperature Range | 0C to +70C | 0C to +70C | 0C to +70C | -40C to +85C (E-grades) | 0C to +70C |
| Internal Reference | +2.5V (integrated) | +2.5V integrated | +2.5V integrated | +2.5V integrated | +2.5V integrated |
| RoHS Compliance | Lead-free (+ suffix indicates RoHS) | RoHS compliant | RoHS compliant | RoHS compliant | RoHS compliant |
主な差別化要因
- Internal +2.5V reference eliminates external shunt regulator （vs MAX1162ACUB+T (external reference required))
- Parallel microprocessor-compatible interface for high-throughput DAQ （vs MAX11120ATI+T (SPI interface))
- Available in both commercial and industrial temperature grades （vs MAX1295ACEG+ (commercial grade only by default))
設計ノート
Decouple AVDD with a 0.1uF X7R ceramic plus 10uF tantalum or ceramic within 5mm of the AVDD pin, and provide an identical network on DVDD to suppress logic-noise coupling into the analog front end. Estimate: with a 10mA dynamic supply current at 420 ksps and a regulator PSRR of 60 dB at 100 kHz, decoupling impedance of 0.1 ohm keeps ripple below 1 mV at the supply pin, well within the datasheet tolerance band for 12-bit INL accuracy.
Place the AGND return of any analog input signal directly to the AGND pin (pin 7) with no shared digital-return currents; route the analog and digital grounds as separate islands and stitch them at a single point near the ADC. The REF decoupling capacitor (typically 0.1uF) must be placed directly on the REF pin (pin 8). Estimate: a 5mm PCB trace from REF pin to decoupling cap adds roughly 5 nH inductance - enough to cause 50 mV reference ringing at 100 MHz harmonics, which can couple into the comparator and add 1-2 LSB noise.
When using the parallel interface at full 420 ksps, the bus transitions couple into the analog input through stray capacitance; isolate the digital lines with a ground trace guard, or use series resistors (22 ohm) on the D0-D7 outputs to dampen the bus-driver edges. Estimate: an unrestrained 2 ns bus edge couples approximately 10 mV into a 5 pF sensor lead, propagating through the MUX into AIN for a visible 1-2 LSB error during sampling.
Do not clock the ADC above 420 ksps - the internal acquisition time requires roughly 8 AC clock cycles of track-and-hold settling before conversion. Driving CS high during a conversion does not abort cleanly and may corrupt the next conversion register; always finish or reset before CS is cycled. Note: when switching channels via the internal MUX, allow at least 1 us settling time between channel switches and start of conversion to avoid cross-channel leakage errors of up to 2 LSB.
コンプライアンス情報
RoHS compliance indicated by + suffix in part number; base version (no +) may be tin-lead and NRND. Halogen-free status not explicitly listed in distributor data.
