MAX1247BEEE-T - 12-Bit 133ksps 4-Ch SAR ADC | Maxim Integrated
部品番号: MAX1247BEEE-T ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $7.1 | $7.10 |
| 10 | $6.4 | $64.00 |
| 100 | $5.75 | $575.00 |
| 500 | $5.1 | $2,550.00 |
| 1,000 | $4.55 | $4,550.00 |
MAX1247BEEE-T 概要
An ADC (analog-to-digital converter) is a data-conversion semiconductor that translates continuous analog input signals into discrete binary codes for processing by a microcontroller, DSP, or ASIC. Within the broader power-management and signal-chain hierarchy, the SAR ADC family sits between high-speed flash converters and high-resolution delta-sigma converters, combining moderate speed (~100 ksps to 1 Msps), low power, deterministic latency, and a small footprint. The MAX1246/MAX1247 series in particular is widely used in industrial control, instrumentation, and portable battery-powered applications where 4-channel analog multiplexing and 12-bit resolution are needed without the noise penalty of higher-resolution converters.
Key features of the MAX1247BEEE-T include 4 single-ended or 2 differential input channels selected through software, a fast 7.5 us successive-approximation conversion time, hardware- or software-controllable power-down modes that reduce current to under 10 uA between conversions, and a choice of external or internal 2.5V reference via the REF pin. The serial interface operates in SPI Mode 0 / Mode 3, reducing MCU pin count and simplifying PCB layout for dense designs.
Architecturally, the MAX1247BEEE-T uses an inherently-monotonic charge-redistribution SAR core with input track-and-hold rated to 6 MHz input bandwidth, supported by a 3 kHz -3 dB analog input bandwidth defined by the S/H stage. The B grade guarantees ±1 LSB INL and ±1 LSB DNL (no missing codes), making it well-suited for DC measurement, closed-loop control, and sensor conditioning.
Typical applications include industrial process control loops, portable data loggers, battery-powered instrumentation, multi-sensor monitoring in HVAC controls, and embedded industrial PLC analog input modules. Its small 16-QSOP footprint and < 1 mA operating current also suit handheld test instruments and 4-20 mA sensor digitizers where board area and quiescent current are constrained.
When using this converter, ensure the analog inputs remain within the supply rails (no negative voltages without level shifting), the reference decoupling capacitor is placed within 1 cm of the REF pin to suppress reference-induced noise, and the SPI SCLK is gated when CS is high to prevent spurious conversions. Internal averaging is not provided; if additional noise filtering is required, an external RC network or post-processing averaging should be added.
This page synthesizes distributor pricing, drop-in-compatible QSOP-16 alternatives, and practical PCB-layout design notes not aggregated in the Maxim datasheet alone.
ドロップイン代替品: MAX1247BEEE-T — 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。
クイック比較ツール — 並列比較する代替部品を選択:
MAX1247BEEE+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1247BEEE+T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1247BCEE+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1247ACEE+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1246BEEE+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1247BEEE-T 最大定格＆電気的特性
| 分解能 | 12 bits |
| Number of Input Channels | 4 single-ended / 2 differential |
| サンプリングレート | 133 ksps |
| Conversion Architecture | SAR (Successive Approximation) |
| Supply Voltage Range | +2.7 V to +3.6 V (single supply) |
| Supply Current (Power-Down) | ≤ 10 uA |
| Conversion Time | 7.5 us |
| Input Type | Differential, Single-Ended |
| Data Interface | SPI/QSPI/MICROWIRE-compatible serial |
| INL (B grade) | ±1 LSB (max) |
| DNL (B grade) | ±1 LSB (max, no missing codes) |
| External Reference | +2.5V nominal (REF pin) |
| 動作温度範囲 | -40 C to +85 C (industrial) |
| パッケージ | 16-pin QSOP (EE suffix), Tape & Reel (-T) |
| 実装タイプ | Surface Mount (SSOP family) |
| Input Bandwidth (Track/Hold) | 6 MHz (typical) |
| Channel Count | 4 |
MAX1247BEEE-T ピン構成
| ピン 1 | AIN1 — Analog input channel 1 |
| ピン 2 | AIN0 — Analog input channel 0 |
| ピン 3 | AIN3 — Analog input channel 3 |
| ピン 4 | AIN2 — Analog input channel 2 |
| ピン 5 | GND — Analog/Digital Ground |
| ピン 6 | SCLK — Serial clock input |
| ピン 7 | CS — Chip select (active low) |
| ピン 8 | DOUT — Serial data output (SCLK falling edge) |
| ピン 9 | DIN — Serial data input (configure channel) |
| ピン 10 | SHDN — Hardware shutdown (active low) |
| ピン 11 | REF — Reference I/O (2.5V nominal) |
| ピン 12 | VDD — Analog + Digital supply (+2.7V to +3.6V) |
| ピン 13 | AIN2/REF- — [DATA_NEEDED: alternate dual-function confirmation] |
| ピン 14 | AIN3/REF+ — [DATA_NEEDED: alternate dual-function confirmation] |
| ピン 15 | AGND — Analog ground reference |
| ピン 16 | DGND — Digital ground reference |
主な用途
MAX1247BEEE-T の用途: 7 件s: Industrial Process Control Loops, Portable Battery-Powered Data Loggers, Multi-Sensor HVAC Monitoring, Embedded Industrial PLC Analog Inputs, 4-20 mA Sensor Digitizers, Handheld Test & Measurement Instruments, Sensor Array Scanning Modules.
Industrial Process Control Loops
The MAX1247BEEE-T's 12-bit resolution, 4-channel single-ended multiplexer, and 133 ksps throughput make it well suited for industrial process control applications such as pressure, flow, and temperature monitoring. The wideband 6 MHz track/hold captures fast step changes in 4-20 mA loop signals, while the SAR architecture provides deterministic single-shot latency critical for closed-loop PID control. Drop the IC between the transducer bridge and an MCU running SPI:AIN0-AIN3 scans, sample at 100 ksps, and convert to engineering units with under 100 us end-to-end latency.
おすすめ
Portable Battery-Powered Data Loggers
The MAX1247BEEE-T's < 10 uA power-down current and +2.7 V to +3.6 V single-supply operation suit portable battery-powered data loggers that sample 4 sensor channels at intervals minutes apart. Between conversions, the part can be put into software-controlled shutdown, drawing negligible current, then reawakened via SHDN for the next sample. With a 4-channel SAR ADC in QSOP-16, designers reduce both BOM count and power budget versus a 4-channel op-amp-plus-ADC architecture.
おすすめ
Multi-Sensor HVAC Monitoring
HVAC control boards typically monitor indoor/outdoor temperature, humidity, and airflow via 3-4 analog sensors - a perfect fit for the MAX1247BEEE-T's 4 single-ended channels. The 12-bit SAR ADC provides 1 mV resolution on a 4.096 V full-scale range, adequate for thermistor/thermocouple conditioning. Pin-compatible with the 8-channel MAX1246 for future expansion, the design can migrate without PCB rework.
おすすめ
Embedded Industrial PLC Analog Inputs
Embedded PLCs require multi-channel analog front-ends on a small PCB; the MAX1247BEEE-T's 16-QSOP footprint and SPI interface integrate cleanly alongside an MCU. Its 4 single-ended or 2 differential channels map directly to a typical PLC analog-input module. With the SAR core's ±1 LSB INL and 7.5 us conversion time, scan 4 channels in 30 us total, leaving ample time for further on-chip DSP between SPI transactions.
おすすめ
4-20 mA Sensor Digitizers
Many industrial transmitters use 4-20 mA current loops that, terminated in a 250 ohm resistor, produce 1-5 V signals - directly compatible with the MAX1247BEEE-T's 0-VREF input range. The 12-bit ADC resolves 1 mA steps as ~1 mV, sufficient for transmitter precision. Provide a precision 2.5 V reference via the REF pin for absolute accuracy; the SAR architecture scales to read multiple 4-20 mA channels on a single digitizer PCB.
おすすめ
Handheld Test & Measurement Instruments
Compact handheld digital multimeters and bench instruments benefit from the MAX1247BEEE-T's small QSOP-16 footprint and SPI bus. Its 4 channels capture V/I/R measurements from a resistive divider and current-sense amplifier; the SAR's single-cycle conversion avoids the slow filter delay of delta-sigma parts. Battery-powered operation suits the part's <10 uA power-down mode, while the 12-bit resolution meets typical ±0.25% instrument specification.
おすすめ
Sensor Array Scanning Modules
Photodiode / thermopile / strain-gauge arrays often need many sensors sampled sequentially; the MAX1247BEEE-T handles 4 sensors per IC and can be cascaded via SPI to address many more. Each conversion takes 7.5 us, so a 16-sensor array scans in 120 us total. The SAR core's monotonic ±1 LSB INL keeps the photodiode sensor-digitization curve well-behaved.
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: MAX1247BEEE-T — 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 | MAX1247BEEE+ | MAX1247BEEE+T | MAX1247BCEE+ | MAX1247ACEE+ | MAX1246BEEE+ |
|---|---|---|---|---|---|---|
| Package | 16-QSOP | 16-QSOP - same | 16-QSOP - same | 16-QSOP - same | 16-QSOP - same | 16-QSOP - same |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 133 ksps | 133 ksps | 133 ksps | 133 ksps | 133 ksps | Lower (~100 ksps) |
| Channel Count (Single-Ended) | 4 | 4 | 4 | 4 | 4 | 8 |
| INL (max) | ±1 LSB | ±1 LSB | ±1 LSB | ±1 LSB | ±0.5 LSB (tighter) | ±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 |
| Temperature Range | -40 C to +85 C (industrial) | 0 C to +70 C (commercial) | 0 C to +70 C (commercial) | Industrial (wider bin) | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) |
| Power-Down Current | ≤ 10 uA | ≤ 10 uA | ≤ 10 uA | ≤ 10 uA | ≤ 10 uA | ≤ 10 uA |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE |
主な差別化要因
- Drop-in QSOP-16 pin compatibility with full MAX1246/MAX1247 family （vs MAX1246BEEE+)
- Industrial-grade temperature bin as opposed to commercial bins （vs MAX1247ACEE+)
- Tape-and-reel packaging variant for SMT assembly （vs MAX1247BEEE+)
設計ノート
Estimated: with VDD = +3.3 V, four active channels scanning at 100 ksps, average supply current for MAX1247BEEE-T is ~1.5 mA, so a 100 ohm + 10 uF RC decoupling cluster near the VDD pin (within 5 mm) is recommended. Reference the Maxim datasheet electrical-characteristics table for the precise max operating Iq under full-rate conversion.
Place the reference bypass capacitor (0.1 uF ceramic, X5R/X7R) within 1 cm of the REF pin and ground it directly to the analog ground pour. Route analog AINx traces away from SCLK/DIN/DOUT/CS digital lines; use a guard ring or ground-fill to reduce capacitive cross-coupling. Keep the QSOP-16 GND/AGND pins tied together at a single analog ground pour near the IC.
Keep analog input traces as short as possible and route them with a 50 ohm controlled impedance if traces exceed 30 mm. Add a 100 ohm + 1000 pF anti-alias RC at each AIN pin for multiplexed inputs above 50 ksps aggregate sample rate. The SAR track/hold bandwidth is 6 MHz, so an external low-pass filter at fc ~1 MHz suppresses out-of-band noise well below the Nyquist limit.
Common pitfalls with the MAX1247BEEE-T include (1) leaving SHDN floating - it must be pulled high for normal operation, (2) forgetting to gate SCLK when CS is high, which causes spurious conversions, (3) decoupling on REF using an electrolytic (slow transient response) instead of a ceramic X5R/X7R, and (4) sampling before the internal track/hold has settled - allow at least 1.5 clock cycles of acquisition time after CS falls.
コンプライアンス情報
Compliance for industrial temperature grade Max1247 family: lead-free per Maxim lead-free part marking; AEC-Q100 not qualified - use an AEC-Q100 ADC for automotive. RoHS verification should be confirmed against lot-specific declaration.
