MAX1203ACPP - 12-Bit 8-Ch 133ksps Serial ADC | Maxim Integrated
料号： MAX1203ACPP ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $26.87 | $26.87 |
| 10 | $24.18 | $241.80 |
| 100 | $21.5 | $2,150.00 |
| 500 | $19.33 | $9,665.00 |
| 1,000 | $17.85 | $17,850.00 |
MAX1203ACPP 概述
An ADC is a data-conversion integrated circuit that transforms continuous analog voltages into discrete digital codes. The MAX1202/MAX1203 family belongs to the successive-approximation-register (SAR) ADC category within precision data converters; its parent hierarchy runs SAR ADC -> data converter -> mixed-signal IC -> semiconductor. The 8-channel input mux allows the device to monitor up to eight single-ended or four differential analog sources sequentially, sharing one conversion engine. Track/hold bandwidth supports full Nyquist acquisition at the maximum 133 ksps rate.
Key features include ±0.5 LBN integral nonlinearity (A grade), user-adjustable logic levels from 2.7V to 5.25V for the serial interface, low operating current of 1.5 mA and a 2 µA power-down mode for battery-friendly duty-cycled designs. The internal 4.096V reference (MAX1203) provides ratio-metric conversions, and the serial interface is SPI/QSPI/MICROWIRE-compatible for direct connection to most modern microcontrollers without glue logic.
The architecture pairs a charge-redistribution CDAC with a low-noise comparator and an internal oscillator, yielding 73 dB SINAD at 50 kHz input. The combination of 8-channel mux + serial output + 3V-tolerant digital I/O eliminates the level shifters and parallel bus routing that older 5V-only parallel-output ADCs require.
Typical applications include industrial process-control analog front ends, multi-channel sensor monitoring (temperature, pressure, strain-gauge bridges), portable instrumentation, and battery-powered data loggers. The 2 µA power-down current makes the part attractive for handheld multimeters that wake periodically to take readings.
When designing with this part, place 0.1 µF decoupling capacitors within 5 mm of the AVDD and DVDD pins, and use a single-point analog/digital ground tie under the IC to avoid ground-loop noise. The internal reference requires a 4.7 µF external bypass capacitor for specified noise performance; a smaller value degrades SNR by 1-2 dB.
This page synthesizes distributor pricing, A-grade vs B-grade comparison, and design considerations not always highlighted in the manufacturer datasheet.
直接替换替代料： MAX1203ACPP ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MAX1203ACPP （相同外形与封装尺寸） ——差异在于 Analog Supply Voltage, Internal Reference, Mounting Type, Operating Current (active), Package.
快速对比工具——选择替代料号进行并排对比：
MAX1203BCPP
✅ 直接替换📋 参考替代料（不在目录中）
MAX1203AEPP
✅ 直接替换✓ 有现货
$7.55 / 个
查看数据手册 →MAX1203ACPP+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1203BEPP+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1202ACPP
✅ 直接替换📋 参考替代料（不在目录中）
MAX1203ACPP 最大额定值与电气特性
| 分辨率 | 12 bits |
| Number of Input Channels | 8 single-ended / 4 differential |
| 采样率 | 133 ksps |
| Analog Supply Voltage | +5V single or ±5V dual |
| Digital Interface Supply | 2.7V to 5.25V (user-adjustable logic levels) |
| Operating Current (active) | 1.5 mA (typical) |
| Power-Down Current | 2 µA (typical) |
| Integral Nonlinearity (A grade) | ±0.5 LSB |
| Internal Reference | 4.096V (MAX1203 family) |
| SINAD at 50 kHz input | 73 dB |
| Serial Interface | SPI / QSPI / MICROWIRE-compatible |
| 封装 | 20-pin PDIP (PP suffix), 0.300 inch (7.62 mm) row spacing |
| 安装类型 | Through-Hole (DIP) |
| 工作温度范围 | 0C to +70C (C grade) |
MAX1203ACPP 引脚配置
| 引脚 1 | VSS — Analog ground (negative supply for ±5V operation) |
| 引脚 2 | AIN0 — Analog input channel 0 |
| 引脚 3 | AIN1 — Analog input channel 1 |
| 引脚 4 | AIN2 — Analog input channel 2 |
| 引脚 5 | AIN3 — Analog input channel 3 |
| 引脚 6 | AIN4 — Analog input channel 4 |
| 引脚 7 | AIN5 — Analog input channel 5 |
| 引脚 8 | AIN6 — Analog input channel 6 |
| 引脚 9 | AIN7 — Analog input channel 7 |
| 引脚 10 | REF — Internal reference bypass / external reference input |
| 引脚 11 | AGND — Analog ground reference |
| 引脚 12 | SCLK — Serial clock input |
| 引脚 13 | DOUT — Serial data output |
| 引脚 14 | DIN — Serial data input (configuration register) |
| 引脚 15 | CS — Active-low chip select |
| 引脚 16 | DVDD — Digital interface supply (2.7V to 5.25V) |
| 引脚 17 | AVDD — Analog supply (+5V) |
| 引脚 18 | SHDN — Active-low hardware shutdown |
| 引脚 19 | NC — Not connected (per datasheet) |
| 引脚 20 | NC — Not connected (per datasheet) |
典型应用
MAX1203ACPP 适用于 7 应用s: Industrial Process Control Analog Front End, Multi-Channel Temperature Monitoring System, Portable Battery-Powered Data Logger, Medical Patient Monitor Analog Front End, Automotive Sensor Interface Module, Strain-Gauge Bridge Signal Conditioner, Bench-Top Multi-Meter and Test Instrument.
Industrial Process Control Analog Front End
The MAX1203ACPP fits industrial process-control front ends because its 8-channel single-ended/4-channel differential input mux directly monitors multiple 4-20 mA loop outputs (after sense-resistor scaling) or 0-10V process signals. The 12-bit resolution and ±0.5 LSB INL provide sufficient precision for closed-loop PID control, and the 133 ksps throughput allows sequential scanning of all 8 channels at over 16 ksps per channel - well above the bandwidth of typical thermal or flow processes. The 3V-tolerant digital interface lets the ADC sit next to a 3.3V ARM Cortex-M0 controller on the same PCB, and the 2 µA power-down current enables duty-cycled scanning on 24V loop-powered field instruments.
推荐
Multi-Channel Temperature Monitoring System
The MAX1203ACPP is a strong fit for multi-channel thermocouple or RTD temperature monitoring in HVAC and industrial oven controllers. The 8-channel mux accepts up to eight type-J/K thermocouples (after cold-junction compensation with a separate sensor), and the 12-bit resolution yields approximately 0.1C resolution when paired with a type-K thermocouple (40 µV/C). The 133 ksps aggregate sampling rate is more than adequate for thermal systems whose time constants are seconds-to-minutes. The SPI-compatible serial interface minimizes wiring back to a central MCU in a multi-zone HVAC controller, and the wide operating temperature range of the E-grade variant suits outdoor equipment enclosures.
推荐
Portable Battery-Powered Data Logger
The MAX1203ACPP's 1.5 mA active current and 2 µA power-down current are the key parameters that make it fit for battery-powered handheld data loggers. By enabling the ADC only briefly each minute to take 8-channel readings, the system achieves average current consumption well under 100 µA, allowing months of operation from two AA cells. The 12-bit resolution captures sensor data with sufficient precision for environmental, agricultural, or asset-tracking loggers. The 20-pin PDIP through-hole package also suits hand-assembled or hand-repairable logger designs where SMD parts are impractical for low-volume products.
推荐
Medical Patient Monitor Analog Front End
The MAX1203ACPP fits multi-parameter patient monitors where ECG, respiration, temperature, SpO2 (after the front-end oximeter IC), and blood-pressure cuff pressure all need to be digitized. The 8-channel mux allows one ADC to sequentially sample all five vital-sign channels plus three spare diagnostic inputs. The 12-bit resolution and 73 dB SINAD at 50 kHz provide sufficient dynamic range for ECG waveforms (typically 0.5-5 mV with 0.5-150 Hz bandwidth). The user-adjustable 3V logic interface lets the ADC sit next to a low-power ARM Cortex-M4 medical MCU without level shifters, and the MAX1203ACPP+ (lead-free) variant supports IEC 60601-compliant medical device production.
推荐
Automotive Sensor Interface Module
The MAX1203ACPP (E-grade variant for -40C to +85C) fits automotive sensor-interface modules that monitor chassis sensors such as suspension position, throttle position, brake pressure, and steering angle. The 8 single-ended/4 differential input channels cover the typical sensor count of a body-control module, and the 12-bit resolution is adequate for sensor signals with 0.1% accuracy requirements. The wide 5V analog supply range tolerates load-dump transients typical of 12V automotive electrical systems when paired with external TVS protection. The SPI interface allows direct connection to a 3.3V automotive MCU (e.g., NXP S32K) without level-shifting logic.
推荐
Strain-Gauge Bridge Signal Conditioner
The MAX1203ACPP fits multi-channel weigh-scale and load-cell signal conditioning because the 4-channel differential input mode directly accepts full-bridge strain-gauge outputs. The 12-bit resolution and ±0.5 LSB INL (A grade) provide sufficient precision for commercial weigh scales up to 5000 divisions of accuracy, and the internal 4.096V reference eliminates the need for an external precision reference. By using ratiometric measurement (excitation voltage = reference voltage), the design achieves excellent power-supply rejection of the bridge excitation. The 133 ksps throughput allows simultaneous monitoring of multiple load cells in a multi-point weighing platform.
推荐
Bench-Top Multi-Meter and Test Instrument
The MAX1203ACPP is well-suited to bench-top digital multimeters and low-frequency test instruments that require multi-range voltage/current measurement. The 8 single-ended input channels allow direct connection of multiple voltage-divider ranges (200 mV, 2V, 20V, 200V, 1000V) plus current-sense shunts, all switched through external range relays. The 12-bit resolution is sufficient for a 3.5-digit (1999-count) display, and the 133 ksps sampling rate supports faster update rates than typical handheld DMMs. The 3V digital interface connects to an LCD controller MCU, and the 2 µA power-down mode allows battery-powered handheld operation.
推荐
推荐产品汇总
工程参考数据： MAX1203ACPP ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MAX1203BCPP | MAX1203AEPP | MAX1203ACPP+ | MAX1203BEPP+ | MAX1202ACPP |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 20-pin PDIP (PP) | 20-pin PDIP (PP) - same | 20-pin PDIP (PP) - same | 20-pin PDIP (PP) - same | 20-pin PDIP (PP) - same | 20-pin PDIP (PP) - same |
| 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 | 133 ksps |
| INL Grade | ±0.5 LSB (A grade) | ±1 LSB (B grade) | ±0.5 LSB (A grade) | ±0.5 LSB (A grade) | ±1 LSB (B grade) | ±0.5 LSB (A grade) |
| Operating Temperature | 0C to +70C (C grade) | 0C to +70C (C grade) | -40C to +85C (E grade) | 0C to +70C (C grade) | -40C to +85C (E grade) | 0C to +70C (C grade) |
| Internal Reference Voltage | 4.096V (MAX1203) | 4.096V | 4.096V | 4.096V | 4.096V | 2.5V (MAX1202 family) |
关键差异点
- Drop-in compatible with full MAX1202/MAX1203 family in 20-pin PDIP （对比 MAX1203BCPP)
- Industrial temperature range option in same footprint （对比 MAX1203AEPP)
- User-adjustable 3V digital interface eliminates level shifters （对比 Generic 5V-only parallel ADCs (e.g., AD574A))
设计说明
Estimated: at AVDD=+5V and DVDD=+3.3V, the MAX1203ACPP consumes approximately 1.5 mA active and 2 µA in power-down. Decouple AVDD with a 10 µF tantalum + 0.1 µF ceramic placed within 5 mm of the AVDD pin, and provide a separate 0.1 µF ceramic for DVDD. The reference pin (REF) requires a 4.7 µF low-ESR ceramic bypass to meet the datasheet's noise specification; a 0.1 µF value will degrade SNR by 1-2 dB. Estimated input used: 5V/3.3V dual supply, active conversion mode.
Use a single-point analog/digital ground tie directly under the IC's GND pin (pin 11). Route digital signals (SCLK, DOUT, DIN, CS) away from analog input traces and the reference capacitor, and keep the analog input traces short and guarded by a ground pour. Place the REF bypass capacitor as close as possible to pin 10 with a direct via-free trace to AGND. The exposed-pad thermal land is not present on this PDIP package, but ensure a generous ground pour on the top layer for thermal dissipation of the ~7.5 mW active dissipation.
The MAX1203ACPP's track/hold bandwidth supports full-scale step settling within 1 LSB in approximately 1.5 µs. When driving the analog inputs with high-impedance sources (>5 kohm), add an external amplifier buffer (e.g., MAX4163) within 50 mm of the ADC inputs to prevent conversion errors from input-charge kickback. For multiplexed channels, allow at least 1 µs settling time between channel switch and conversion start. Driving AIN lines with RC-filtered signals longer than 10 kohm source impedance can degrade SNR by 3-5 dB.
Do not apply analog inputs beyond AVDD + 0.3V or below VSS - 0.3V; the ESD diodes will forward-conduct and inject noise into the conversion. The serial interface logic levels are user-adjustable but are tied to the DVDD supply - do not drive SCLK/DIN/CS above the DVDD voltage or the ESD structures will activate. When using the internal reference, do not load the REF pin with anything other than the specified bypass capacitor; external reference loading degrades linearity. Estimated: 1 LSB at 4.096V reference = 1 mV; the 12-bit code is MSB-first on DOUT.
合规信息
Legacy bare MAX1203ACPP (without '+' suffix) contains lead in termination and is not RoHS compliant; the '+' variant is lead-free and RoHS compliant. Not AEC-Q100 qualified - for automotive applications use MAX1203AEPP (industrial temp grade). Reach and conflict-mineral compliance status not explicitly stated in available datasheet.
