MAX1246BCEE - 12-Bit, 133ksps, 4-Ch SAR ADC | Maxim Integrated
部品番号: MAX1246BCEE ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $12.45 | $12.45 |
| 10 | $11.2 | $112.00 |
| 100 | $9.85 | $985.00 |
| 500 | $8.4 | $4,200.00 |
| 1,000 | $7.1 | $7,100.00 |
MAX1246BCEE 概要
A SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm with an internal capacitive DAC and a comparator to resolve one bit per clock cycle, delivering deterministic latency and excellent DC accuracy without pipeline delay. SAR ADCs are widely favored for multiplexed multi-channel data acquisition systems where precise, low-noise measurements of slowly-changing sensor signals are required, occupying a position above general-purpose integrating ADCs and below higher-speed pipeline ADCs in the data-converter hierarchy.
Key specifications include ±1 LSB INL (B-grade), ±1 LSB DNL (no missing codes), an internal 2.048V reference, a hardware SHDN-bar pin plus software-controlled power-down that drops supply current to under 1 µA between conversions, and an external differential reference option. The MAX1246 family also provides automatic end-of-conversion shutdown for true micropower operation, making it well suited to battery-powered instrumentation.
The 16-QSOP pinout exposes AIN0–AIN3 (or AIN0/1+ and AIN2/3-), REF, REFADJ, SHDN-bar, CS-bar, SCLK, DOUT, and DGND/SGND. Hardware-programmable channel-count and reference mode pins allow the same silicon to be configured as 2-channel differential or 4-channel single-ended without software overhead.
Typical applications include portable data loggers, 4-20 mA loop-powered sensors, battery stack monitors, isolated transducer front ends, panel meters, and medical instrumentation front ends. For multi-rail designs needing more channels or higher speed, consider the MAX1230 family; for lower-power 8-channel needs, the MAX1247 is pin-compatible.
Designers should place 0.1 µF ceramic bypass close to VDD and REF, route AIN traces away from SCLK/DOUT, and use the SHDN-bar pin to gate conversions for sub-microamp idle current. Compared with the MAX1246AEEE+, the B-grade guarantees tighter ±1 LSB INL/DNL across the full operating range.
ドロップイン代替品: MAX1246BCEE — 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: MAX1246BCEE （同一形状・フットプリント） — 相違点: Architecture, Input Type, Operating Temperature, Resolution.
クイック比較ツール — 並列比較する代替部品を選択:
MAX1246BCEE+T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1246ACEE+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1246AEEE+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1246AEEE+T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1247CEE+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1246BCEE 最大定格＆電気的特性
| 分解能 | 12 bit |
| サンプリングレート | 133 ksps |
| Number of Input Channels | 2 differential / 4 single-ended |
| Input Type | Differential, Single-Ended |
| 電源電圧 | +2.7 V to +3.6 V |
| Supply Current (full throughput) | 0.9 mA typ |
| Power Consumption | 2.7 mW at 133 ksps |
| シャットダウン電流 | < 1 µA |
| INL (B-grade) | ±1 LSB (max) |
| DNL (B-grade) | ±1 LSB (no missing codes) |
| Internal Reference | 2.048 V |
| Data Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Configuration | MUX-S/H-ADC |
| Architecture | SAR |
| パッケージ | 16-pin QSOP |
| 動作温度 | 0°C to +70°C (commercial) |
| RoHS ステータス | Compliant |
MAX1246BCEE ピン構成
| ピン 1 | AIN0 — Analog input channel 0 |
| ピン 2 | AIN1 — Analog input channel 1 |
| ピン 3 | AIN2 — Analog input channel 2 |
| ピン 4 | AIN3 — Analog input channel 3 |
| ピン 5 | SGND — Signal ground |
| ピン 6 | REFADJ — Reference adjust / external reference select |
| ピン 7 | REF — Reference bypass / external reference input |
| ピン 8 | VDD — Positive supply (+2.7 V to +3.6 V) |
| ピン 9 | SCLK — Serial clock input |
| ピン 10 | CS-bar — Active-low chip select |
| ピン 11 | DOUT — Serial data output |
| ピン 12 | SHDN-bar — Active-low hardware shutdown |
| ピン 13 | NC — Not connected (per datasheet) |
| ピン 14 | DGND — Digital ground |
| ピン 15 | NC — Not connected (per datasheet) |
| ピン 16 | NC — Not connected (per datasheet) |
主な用途
MAX1246BCEE の用途: 6 件s: Portable Data Loggers, 4-20 mA Loop-Powered Sensors, Battery Stack Monitors, Panel Meters and Digital Multimeters, Medical Instrumentation Front Ends, Industrial Isolated Transducer Front Ends.
Portable Data Loggers
The MAX1246BCEE is well suited for handheld 4-channel data loggers digitizing thermocouples, RTDs, and battery voltages. Its 12-bit resolution, ±1 LSB INL (B-grade), and 133 ksps throughput let it capture multi-sensor bursts without aliasing, while the integrated 4:1 MUX eliminates an external analog switch. At 2.7 mW full-speed power and <1 µA in shutdown, it lets the logger sleep for months on a single CR2032 cell. The SHDN-bar pin enables firmware to gate conversions, so the same silicon can also serve 2-wire loop-powered loggers.
おすすめ
4-20 mA Loop-Powered Sensors
In 2-wire 4-20 mA loop transmitters the MAX1246BCEE digitizes the sensor bridge with a 12-bit, ±1 LSB DNL core while drawing only 2.7 mW. Its 2.7 V minimum supply lets it run directly off the 12-24 V loop after a small shunt regulator, and the internal 2.048 V reference is calibrated for ratiometric measurement of strain gauges and RTDs. SHDN-bar plus auto power-down between conversions keeps loop current budget under 3 mA, leaving the 4-20 mA signal range untouched for live transmission back to the PLC.
おすすめ
Battery Stack Monitors
Battery-management boards for lithium-ion packs use the MAX1246BCEE to digitize per-cell voltages and pack current at 133 ksps with ±1 LSB DNL. The internal MUX accepts up to four cell-sense inputs without an external switch, simplifying the BMS BOM, while the 2.7 V minimum supply rides directly on the lowest cell rail. The SHDN-bar pin is asserted between cell scans so total quiescent draw drops below 1 µA, extending shelf life. Built-in internal reference also reduces external components in cost-sensitive BMS modules.
おすすめ
Panel Meters and Digital Multimeters
Handheld digital multimeters and panel meters rely on the MAX1246BCEE for its 12-bit ±1 LSB INL B-grade accuracy and 4-channel muxed input. The internal 2.048 V reference allows direct measurement of low-voltage signals after a precision resistor divider, and the SPI-compatible serial interface is easy to drive from low-cost 8-bit microcontrollers. The <1 µA shutdown current extends battery life between measurements, and the QSOP-16 footprint is small enough for sub-100 mm² meter PCBs.
おすすめ
Medical Instrumentation Front Ends
Patient monitors, infusion pumps, and portable diagnostic devices use the MAX1246BCEE to digitize sensor outputs from thermistors, pulse oximeters, and pressure transducers. The 12-bit B-grade INL/DNL guarantees clinical accuracy over the full commercial temperature range, and the 2.7 V minimum supply supports single-cell lithium or 2x alkaline operation. SPI/QSPI compatibility enables firmware to integrate cleanly with low-power ARM Cortex-M microcontrollers, and the <1 µA shutdown supports strict IEC 60601 idle-current budgets in battery-powered carts.
おすすめ
Industrial Isolated Transducer Front Ends
Isolated current, voltage, and temperature transducers digitize on the field side with the MAX1246BCEE before crossing an isolation barrier. The QSOP-16 package fits inside the small transducer head, and the 12-bit ±1 LSB B-grade accuracy meets Class 0.5 metering requirements. SPI output drives an isolator such as a digital isolator or opto-coupler with minimal firmware overhead, and the integrated MUX handles up to four sense channels per chip. The 2.7-3.6 V supply is conveniently compatible with 3.3 V isolated rails.
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: MAX1246BCEE — 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 | MAX1246BCEE+T | MAX1246ACEE+ | MAX1246AEEE+ | MAX1246AEEE+T | MAX1247CEE+ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) |
| Package | 16-QSOP | 16-QSOP - same | 16-QSOP - same | 16-QSOP - same | 16-QSOP - same | 16-QSOP - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 133 ksps | 133 ksps | 133 ksps | 133 ksps | 133 ksps | 133 ksps |
| Input Channels (single-ended / differential) | 4 / 2 | 4 / 2 | 4 / 2 | 4 / 2 | 4 / 2 | 8 / 4 |
| DNL (no missing codes) | ±1 LSB | ±1 LSB | ±1 LSB | ±1 LSB | ±1 LSB | ±1 LSB |
| Supply Voltage | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +2.7 V to +3.6 V |
| Internal Reference | 2.048 V | 2.048 V | 2.048 V | 2.048 V | 2.048 V | 2.048 V |
主な差別化要因
- B-grade INL/DNL with no missing codes （vs MAX1246ACEE+)
- 4-channel internal MUX in QSOP-16 （vs MAX1247CEE+)
- Hardware SHDN-bar plus auto end-of-conversion power-down （vs MAX1246AEEE+)
設計ノート
Place a 0.1 µF X7R ceramic bypass capacitor within 5 mm of the VDD pin and a 10 µF tantalum or ceramic bulk capacitor at the board supply input. The MAX1246BCEE draws 0.9 mA typ at 133 ksps, so a small ferrite bead on the VDD trace improves noise rejection from upstream switching regulators. Use the SHDN-bar pin to gate conversions; pulling it low drops quiescent current below 1 µA per the datasheet, so battery-powered designs should idle in shutdown whenever idle.
Route AIN0-AIN3 traces symmetrically and away from SCLK/DOUT to avoid digital coupling. Use a star ground topology with SGND and DGND joined only at the ADC GND pins to prevent ground-loop noise from coupling into the reference. The QSOP-16 package has a 0.635 mm pitch, so use 0.20 mm/0.25 mm trace-and-space design rules and a continuous ground pour under the part to act as a guard ring for analog traces.
Do not leave REF un-bypassed: a 4.7 µF tantalum plus 0.1 µF ceramic on REF is required for low noise. Avoid applying analog inputs before VDD is stable; the part latches up if any AIN pin exceeds VDD + 0.3 V. When switching to external reference mode, drive REFADJ before CS-bar falling edge per datasheet timing. Finally, do not exceed the 133 ksps throughput even briefly - the internal S/H settling becomes the bottleneck above rated speed.
コンプライアンス情報
RoHS compliant and lead-free per Maxim/ADI material declaration. AEC-Q100 not applicable (commercial grade). For automotive applications, consult Maxim/ADI for available AEC-Q100 qualified SAR ADCs in the MAX11xx/MAX12xx families.
