MAX1203BEAP - 12-Bit 133kSPS 8-Ch SAR ADC | Maxim Integrated
MPN: MAX1203BEAP ✓ Hoạt độngMAX1203BEAP Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho MAX1203BEAP — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MAX1203BEAP (cùng hình factor và footprint) — khác nhau ở Package, Resolution, RoHS Status, Sampling Rate, Converter Type.
MAX1203BEAP+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1203ACAP+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1203BCAP+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1202BEAP
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1202ACAP
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX1145BEAP+
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX1203BEAP Tỷ lệ tối đa & tính chất điện
| Manufacturer | Analog Devices Inc. / Maxim Integrated |
| Product Category | Analog-to-Digital Converter (ADC) |
| Architecture | SAR (Successive Approximation Register) |
| Độ phân giải | 12 bit |
| Number of Channels | 8 (single-ended) / 4 (differential) |
| Tỷ lệ lấy mẫu | 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 |
| Khoảng nhiệt độ hoạt động | -40 °C to +85 °C (E temperature grade) |
| Hộp | 20-pin SSOP |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Lead-Free / Halogen-Free | Yes (per Maxim datasheet) |
Cấu hình chân MAX1203BEAP
| Chân 1 | AGND — Analog Ground |
| Chân 2 | AVDD — +5V Analog Supply |
| Chân 3 | REF — Reference Voltage (4.096V internal) / Reference I/O |
| Chân 4 | REFADJ — Reference Adjust / Reference OK Output |
| Chân 5 | AIN0 — Analog Input Channel 0 |
| Chân 6 | AIN1 — Analog Input Channel 1 |
| Chân 7 | AIN2 — Analog Input Channel 2 |
| Chân 8 | AIN3 — Analog Input Channel 3 |
| Chân 9 | AIN4 — Analog Input Channel 4 |
| Chân 10 | AIN5 — Analog Input Channel 5 |
| Chân 11 | AIN6 — Analog Input Channel 6 |
| Chân 12 | AIN7 — Analog Input Channel 7 |
| Chân 13 | DGND — Digital Ground |
| Chân 14 | DVDD — +3V Digital Supply |
| Chân 15 | /SHDN — Active-Low Shutdown |
| Chân 16 | DOUT — Serial Data Output (SPI) |
| Chân 17 | SSTRB — Serial-Strobe Output |
| Chân 18 | SCLK — Serial Clock Input |
| Chân 19 | /CS — Active-Low Chip Select |
| Chân 20 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
MAX1203BEAP phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX1203BEAP — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Highest fault tolerance in the 12-bit 8-channel SSOP-20 SAR family (vsMAX1202BEAP)
- Wider bipolar input range with on-chip ±16.5V protection (vsMAX1145BEAP+)
- Industrial -40°C to +85°C operating range (vsMAX1203BCAP+)
- Lower shutdown current is required (vsMAX1202ACAP)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
