MAX1203BEAP - 12-Bit 133kSPS 8-Ch SAR ADC | Maxim Integrated
部品番号: MAX1203BEAP ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.8 | $980.00 |
| 500 | $8.45 | $4,225.00 |
| 1,000 | $7.1 | $7,100.00 |
MAX1203BEAP 概要
An SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm and an internal capacitive DAC to converge on the input voltage in N clock cycles for an N-bit result. Compared with sigma-delta or pipeline architectures, SAR ADCs offer deterministic latency, no pipeline delay, low latency, low latency and excellent DC accuracy, making them ideal for multiplexed multi-channel data acquisition systems where each channel must be sampled at well-defined instants.
Key features include 8 analog input channels (configurable as 4 differential pseudo-differential / 8 single-ended), ±1 LSB INL (linearization error) and ±1 LSB DNL (differential non-linearity), a true bipolar ±12V input range with ±5V at AVDD = +5V, an internal +4.096V reference (typ 0.5% accuracy), software-configurable unipolar/bipolar input ranges, low supply current of 2.5 mA (typ) at 133 kSPS, and a hardware /SWRG/shutdown pin that drops current to < 10 µA between conversions. The serial interface supports SPI/QSPI/MICROWIRE with a 3V/5V-tolerant digital supply.
The MAX1203BEAP uses a charge-redistribution SAR core with input fault protection to ±16.5V, an on-chip reference buffer, and a high-impedance analog input. Power-down sequencing and analog/digital grounds are independent on pin 9 (AGND) and pin 10 (DGND), simplifying PCB layout for mixed-signal systems. The reference-OK output enables external supervision of reference integrity in safety-critical applications.
Typical applications include multichannel data acquisition systems for industrial process control, programmable logic controller (PLC) analog input modules, portable or battery-powered instrumentation, patient monitoring via thermistor/bridge front-ends, and any mixed +5V analog / +3V digital embedded design. The bipolar input range makes it especially attractive for direct connection to ±10V industrial transducers after external resistor scaling.
When designing with this part, observe the manufacturer recommended input signal conditioning (an external op-amp buffer / 2N7000 second-stage analog input protection is recommended for ±15V loadings) and keep the analog and digital ground returns separated to a single star-point near the IC. Reference bypass (10 µF + 0.1 µF at REF pin) is mandatory for full 12-bit performance. /CS framing and SCLK idle-high framing must follow SPI mode 1/2 conventions described in the manufacturer datasheet.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, with concrete parametric context that complements the Maxim datasheet.
ドロップイン代替品: MAX1203BEAP — 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: MAX1203BEAP （同一形状・フットプリント） — 相違点: Package, Resolution, RoHS Status, Sampling Rate, Converter Type.
クイック比較ツール — 並列比較する代替部品を選択:
MAX1203BEAP+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1203ACAP+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1203BCAP+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1202BEAP
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1202ACAP
✅ ドロップイン✓ 在庫あり
$7.17 / 個
データシートを見る →MAX1145BEAP+
✅ ドロップイン✓ 在庫あり
$5.95 / 個
データシートを見る →MAX1203BEAP 最大定格＆電気的特性
| Manufacturer | Analog Devices Inc. / Maxim Integrated |
| Product Category | Analog-to-Digital Converter (ADC) |
| Architecture | SAR (Successive Approximation Register) |
| 分解能 | 12 bit |
| Number of Channels | 8 (single-ended) / 4 (differential) |
| サンプリングレート | 133 kSPS |
| Input Type | Differential, Single-Ended, Pseudo-Differential |
| Analog Supply Voltage (AVDD) | 4.75 V to 5.25 V (nominal 5 V) |
| Digital Supply Voltage (DVDD) | 2.7 V to 5.25 V (drives +3 V logic) |
| Analog Input Range | 0 V to +5 V (unipolar); ±5 V (bipolar, ±VREF mode); ±12 V with external scaling |
| Input Fault Tolerance | ±16.5 V at AVDD = +5 V |
| Integral Non-Linearity (INL) | ±1 LSB (max) |
| Differential Non-Linearity (DNL) | ±1 LSB (max, no missing codes) |
| Internal Reference Voltage | +4.096 V |
| Supply Current (active) | 2.5 mA (typ at 133 kSPS) |
| Supply Current (shutdown) | < 10 µA |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible serial |
| 動作温度範囲 | -40 °C to +85 °C (E temperature grade) |
| パッケージ | 20-pin SSOP |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant |
| Lead-Free / Halogen-Free | Yes (per Maxim datasheet) |
MAX1203BEAP ピン構成
| ピン 1 | AGND — Analog Ground |
| ピン 2 | AVDD — +5V Analog Supply |
| ピン 3 | REF — Reference Voltage (4.096V internal) / Reference I/O |
| ピン 4 | REFADJ — Reference Adjust / Reference OK Output |
| ピン 5 | AIN0 — Analog Input Channel 0 |
| ピン 6 | AIN1 — Analog Input Channel 1 |
| ピン 7 | AIN2 — Analog Input Channel 2 |
| ピン 8 | AIN3 — Analog Input Channel 3 |
| ピン 9 | AIN4 — Analog Input Channel 4 |
| ピン 10 | AIN5 — Analog Input Channel 5 |
| ピン 11 | AIN6 — Analog Input Channel 6 |
| ピン 12 | AIN7 — Analog Input Channel 7 |
| ピン 13 | DGND — Digital Ground |
| ピン 14 | DVDD — +3V Digital Supply |
| ピン 15 | /SHDN — Active-Low Shutdown |
| ピン 16 | DOUT — Serial Data Output (SPI) |
| ピン 17 | SSTRB — Serial-Strobe Output |
| ピン 18 | SCLK — Serial Clock Input |
| ピン 19 | /CS — Active-Low Chip Select |
| ピン 20 | NC — Not connected (per datasheet) |
主な用途
MAX1203BEAP の用途: 6 件s: Industrial Process Control / PLC Analog Front End, Multichannel Data Acquisition Systems, Portable / Battery-Powered Instrumentation, Patient Monitoring and Medical Instrumentation, Automotive Sensor Interface Modules, Mixed-Signal Embedded Systems (5V Analog / 3V Digital).
Industrial Process Control / PLC Analog Front End
The MAX1203BEAP's 8 single-ended / 4 differential analog input channels and ±5V bipolar input range (extendable to ±12V with external scaling) make it ideal for industrial process control PLC analog input modules. With 12-bit acquisition at 133 kSPS and ±1 LSB INL, it can sample multiple 4-20 mA current-loop or RTD output signals through one IC, reducing BOM cost. The +5V AVDD with +3V DVDD support simplifies mixed-signal designs, while ±16.5V input fault tolerance protects against 24V industrial bus transients.
おすすめ
Multichannel Data Acquisition Systems
For 12-bit SAR data acquisition systems digitizing thermocouples, strain gauges, and pressure transducers, the MAX1203BEAP's 8-channel MUX delivers deterministic 12-bit acquisition at 133 kSPS with no pipeline delay, ideal for multiplexed control and multiplexed transducer sampling. The internal +4.096V reference simplifies BOM (no external reference needed), while ±1 LSB INL/DNL with no missing codes guarantees monotonic data acquisition. Software-configurable unipolar/bipolar input ranges accommodate both 0-5V and ±5V industrial transducer outputs.
おすすめ
Portable / Battery-Powered Instrumentation
The MAX1203BEAP's low 2.5 mA active supply current and <10 µA hardware shutdown current (via /SHDN pin) make it suitable for portable handheld instrumentation such as digital multimeters and field data loggers. The 12-bit acquisition at 133 kSPS is sufficient for slow DC measurements, while the +3V DVDD support enables direct interfacing with low-power microcontrollers. The on-chip +4.096V reference eliminates external reference power drain, extending battery life in remote sensor logging.
おすすめ
Patient Monitoring and Medical Instrumentation
The MAX1203BEAP's 8-channel MUX and ±1 LSB INL support multichannel patient monitoring equipment, sampling ECG, EEG, SpO2, temperature, and respiration sensors through one ADC. The 12-bit acquisition at 133 kSPS provides adequate resolution for vital-sign monitoring, while the bipolar ±5V input range accepts direct bridge-sensor outputs. The serial SPI interface simplifies isolation barrier design for IEC 60601-1 patient leakage compliance, and the +3V DVDD support interfaces with low-power medical microcontrollers.
おすすめ
Automotive Sensor Interface Modules
Although the SPEC for MAX1203BEAP is industrial-grade -40°C to +85°C, the 8-channel MUX and 12-bit SAR acquisition make it well-suited for non-safety-critical automotive sensor interface modules such as body controllers, HVAC controls, and battery management. The ±16.5V fault tolerance handles automotive load-dump transients, while the bipolar ±5V input range accepts ±10V automotive sensors directly. The 30-mode solar charging and 30-mode solar inverter designs may also leverage this ADC for current/voltage monitoring.
おすすめ
Mixed-Signal Embedded Systems (5V Analog / 3V Digital)
The MAX1203BEAP's independent +5V AVDD and +3V DVDD rails (2.4V-5V discrete) make it ideal for mixed-signal embedded systems where legacy 5V sensors interface with modern 3.3V microcontrollers. The serial SPI/QSPI/MICROWIRE-compatible interface supports standard MCU SPI peripherals, while the 12-bit acquisition at 133 kSPS provides ample sampling for control loops. The 20-pin SSOP package saves PCB area, and the integrated +4.096V reference simplifies the BOM for cost-sensitive designs.
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: MAX1203BEAP — 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 | MAX1203BEAP+ | MAX1203ACAP+ | MAX1203BCAP+ | MAX1202BEAP | MAX1202ACAP | MAX1145BEAP+ |
|---|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 20-SSOP | 20-SSOP (same) | 20-SSOP (same) | 20-SSOP (same) | 20-SSOP (same) | 20-SSOP (same) | 20-SSOP (same) |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 133 kSPS | 133 kSPS | 133 kSPS | 133 kSPS | 400 kSPS | 400 kSPS | 140 kSPS |
| Number of Channels | 8 single-ended / 4 differential | 8 / 4 | 8 / 4 | 8 / 4 | 8 / 4 | 8 / 4 | 8 / 4 |
| Input Voltage Range | ±5V bipolar, ±16.5V fault | ±5V bipolar, ±16.5V fault | ±5V bipolar, ±16.5V fault | ±5V bipolar, ±16.5V fault | ±5V bipolar | ±5V bipolar | ±3V single-supply |
| Temperature Grade | -40°C to +85°C (E) | -40°C to +85°C (E) | 0°C to +120°C (A) | 0°C to +70°C (B) | -40°C to +85°C (E) | 0°C to +120°C (A) | -40°C to +85°C (E) |
| Internal Reference | +4.096V | +4.096V | +4.096V | +4.096V | +4.096V | +4.096V | +2.5V |
主な差別化要因
- Highest fault tolerance in the 12-bit 8-channel SSOP-20 SAR family （vs MAX1202BEAP)
- Wider bipolar input range with on-chip ±16.5V protection （vs MAX1145BEAP+)
- Industrial -40°C to +85°C operating range （vs MAX1203BCAP+)
- Lower shutdown current is required （vs MAX1202ACAP)
設計ノート
Must follow the manufacturer recommended PCB layout: separate analog ground (pin 1, AVDD) and digital ground (pin 13, DVDD) planes that join at a single star-point under the IC. Place the 10 µF tantalum + 0.1 µF ceramic decoupling pair within 5 mm inside the IC for each supply pin. AIN traces should be guarded by analog ground on both sides, and digital traces (SCLK, DOUT, /CS, /SHDN) should be routed away from AIN traces to minimize digital-to-analog crosstalk. A 10 µF + 0.1 µF reference bypass pair at the REF pin is mandatory for full 12-bit acquisition performance.
Must use the manufacturer recommended power-supply sequencing: AVDD must be present before or simultaneously with DVDD to prevent input latchup. If DVDD is supplied before AVDD, input protection diodes may forward-bias, causing permanent damage. For hardware shutdown, drive /SHDN high within 1 µs of power-up to bring the part out of shutdown and start conversions. The internal reference requires 10 ms to settle to 12-bit, so allow 20 ms after exiting shutdown before the first conversion.
Must observe the manufacturer recommended signal-conditioning practices: add a 1 kΩ series resistor and 100 pF capacitor to each AIN pin for ±15V transient protection, or use external clamping diodes to AGND/AVDD. For ±10V industrial 24V-input or ±15V transducer inputs, use a 4:1 resistive divider (10 kΩ + 3.3 kΩ) before the AIN pin to scale ±12V to ±3V within the IC's input range. SCLK should be limited to 4 MHz max with 50% duty cycle for clean acquisition; SCLK idle state must be high (mode 1 of SPI).
Must avoid common pitfalls: (1) Do not exceed ±16.5V input fault voltage on AIN pins - even momentary overvoltage can damage the IC. (2) Do not leave the REF pin floating - always bypass with 10 µF + 0.1 µF to AGND. (3) Do not toggle /CS during a conversion (SSTRB low) - this corrupts the conversion and yields erroneous data. (4) Do not connect unused AIN pins directly to AGND - they should be left floating or tied to mid-supply to minimize leakage current. (5) Always read /SSTRB before clocking DOUT to ensure conversion is complete.
コンプライアンス情報
MAX1203BEAP (without + suffix) is the lead-bearing version and is not RoHS compliant. The MAX1203BEAP+ variant is RoHS compliant and lead-free. Both versions are halogen-free per Maxim datasheet. AEC-Q100 is not qualified - this is an industrial-grade part, not automotive-qualified.
