MAX1204ACAP - 10-Bit 8-Ch Serial ADC w/ 3V I/O | Maxim Integrated
料号： MAX1204ACAP ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $9.45 | $9.45 |
| 10 | $8.75 | $87.50 |
| 100 | $7.85 | $785.00 |
| 500 | $7.1 | $3,550.00 |
| 1,000 | $6.4 | $6,400.00 |
MAX1204ACAP 概述
An ADC (analog-to-digital converter) is a data-acquisition component that converts real-world analog signals into discrete digital codes for processing by microcontrollers, DSPs, or FPGAs. ADCs sit at the boundary between the analog and digital signal domains and form part of the broader signal-chain hierarchy: sensor/transducer -> signal conditioning -> ADC -> digital controller. Within that hierarchy, the MAX1204ACAP belongs to the successive-approximation-register (SAR) family, which trades conversion speed for high accuracy and low power dissipation.
Key features of the MAX1204ACAP include an aggregate sampling rate of up to 133 ksps, low power dissipation of typically less than 3 mA at full throughput, and an internal 4.096 V reference that simplifies external BOM and PCB layout. The 3V digital interface allows direct connection to low-voltage microcontrollers without external level shifters, while the 5V analog supply preserves full-scale input range for industrial-grade sensor signals.
Architecturally, the device uses a switched-capacitor DAC and a precision comparator inside the SAR loop, achieving 10-bit resolution without missing codes. The serial interface shifts out conversion data on SCLK falling edges and accepts an active-low CS for chip selection, allowing multiple devices to share a single SPI bus in multiplexed data-acquisition systems.
Typical applications include industrial process control, portable instrumentation, data logging, patient monitoring, and any mixed-voltage embedded system that needs multiple analog channels with a small serial-interface footprint. The wide analog supply range (4.75 V to 5.25 V) makes the part especially suitable for legacy 5V analog front-ends.
When designing with the MAX1204ACAP, place the 10 uF bypass capacitor on AVdd as close as possible to the pin and keep the analog and digital ground returns separated until they tie together at the exposed pad. This minimizes digital switching noise from coupling into the reference and degrading effective resolution.
This page synthesizes distributor pricing, pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替换替代料： MAX1204ACAP ——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： MAX1204ACAP （相同外形与封装尺寸） ——差异在于 Input Range, Operating Temperature, Package, Resolution, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
MAX1204ACAP+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1204BCAP+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1204AEAP+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1204BEAP+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1202ACAP
✅ 直接替换✓ 有现货
$7.17 / 个
查看数据手册 →MAX1204ACAP 最大额定值与电气特性
| 分辨率 | 10 bit |
| Number of Channels | 8 single-ended / 4 pseudo-differential |
| 采样率 | 133 ksps (aggregate) |
| Architecture | SAR (Successive Approximation Register) |
| Analog Supply Voltage (AVdd) | 4.75 V to 5.25 V |
| Digital Supply Voltage (DVdd) | 2.7 V to 3.6 V |
| Digital Interface | SPI / QSPI / MICROWIRE compatible |
| Internal Reference | 4.096 V |
| Input Range | 0 V to VREF (unipolar) |
| 工作温度 | 0C to +70C (commercial grade) |
| 封装 | 20-pin SSOP |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 |
| RoHS 状态 | Non-RoHS (legacy part) |
| Lead-Free | No (legacy matte-tin finish) |
MAX1204ACAP 引脚配置
| 引脚 1 | AIN0 — Analog input channel 0 |
| 引脚 2 | AIN1 — Analog input channel 1 |
| 引脚 3 | AIN2 — Analog input channel 2 |
| 引脚 4 | DVdd — Digital supply voltage (2.7 V to 3.6 V) |
| 引脚 5 | CS — Active-low chip select |
| 引脚 6 | DGND — Digital ground |
| 引脚 7 | SCLK — Serial clock input |
| 引脚 8 | DOUT — Serial data output |
| 引脚 9 | SSTRB — Serial-strobe output (conversion status) |
| 引脚 10 | REF — Reference voltage (4.096 V internal) |
| 引脚 11 | REFADJ — Reference adjust (leave floating for internal ref) |
| 引脚 12 | AGND — Analog ground |
| 引脚 13 | AIN3 — Analog input channel 3 |
| 引脚 14 | AIN4 — Analog input channel 4 |
| 引脚 15 | AIN5 — Analog input channel 5 |
| 引脚 16 | AIN6 — Analog input channel 6 |
| 引脚 17 | AIN7 — Analog input channel 7 |
| 引脚 18 | NC — Not connected (per datasheet) |
| 引脚 19 | NC — Not connected (per datasheet) |
| 引脚 20 | AVdd — Analog supply voltage (4.75 V to 5.25 V) |
典型应用
MAX1204ACAP 适用于 6 应用s: Industrial Process Control, Portable Data Logging Instrumentation, Patient Medical Monitoring, Embedded Sensor Hubs (IoT Edge Nodes), Automotive Sensor Interface Modules, Test & Measurement Front-Ends.
Industrial Process Control
The MAX1204ACAP fits industrial process-control boards because its 5 V analog supply tolerates the 4-20 mA current-loop-derived voltage signals typical in factory sensor transmitters, while its 3 V DVdd ties directly to a 3.3 V microcontroller without level shifters. The eight single-ended channels allow simultaneous monitoring of multiple process variables (temperature, pressure, flow, level) on one ADC, eliminating external analog switches. With 133 ksps aggregate throughput the device easily handles 10 Hz industrial update rates with margin, and the integrated 4.096 V reference simplifies the BOM. Designers should route analog and digital grounds separately and tie them at the exposed pad to keep digital switching noise away from the reference node.
推荐
Portable Data Logging Instrumentation
Hand-held data loggers benefit from the MAX1204ACAP's small 20-pin SSOP footprint, internal 4.096 V reference, and multi-channel capability. Battery-powered loggers that sample at sub-ksps rates can duty-cycle the analog supply to extend operating time. The 3 V digital interface mates directly with low-power ARM Cortex-M0/M4 microcontrollers that dominate portable instrument designs. Eight channels allow one ADC to digitize several thermocouples or strain gauges simultaneously. The internal reference removes the cost of a separate reference IC, important for cost-sensitive consumer-grade loggers.
推荐
Patient Medical Monitoring
Multi-parameter patient monitors (bedside ECG, SpO2, temperature, respiration) benefit from the MAX1204ACAP's combination of eight analog inputs, 3 V digital interface, and small SSOP-20 package. The 5 V analog supply preserves full dynamic range for biomedical analog front-ends, while the 3 V DVdd allows direct interfacing with low-power medical MCUs. The integrated 4.096 V reference trims BOM count, important for compact medical form factors. Although the part is commercial-grade (0C to +70C), the surrounding thermal management in patient monitors typically keeps the device well within its operating envelope. For higher-precision patient-monitoring designs the MAX1204BEAP+ (extended -40C to +85C) is preferred.
推荐
Embedded Sensor Hubs (IoT Edge Nodes)
IoT edge nodes and smart-sensor hubs need to aggregate many analog sensors with minimal board area, and the MAX1204ACAP delivers eight channels in a compact SSOP-20 footprint. The 3 V SPI/QSPI/MICROWIRE interface connects directly to popular IoT microcontrollers (ESP32, nRF52, STM32) without external level translation. The 4.096 V internal reference gives a generous full-scale range that matches typical 3.3 V sensor outputs. While the part's operating current is not as low as ultra-low-power ADCs, it is acceptable for line-powered or large-battery IoT gateways. For battery-only edge nodes a nano-power SAR ADC is preferable.
推荐
Automotive Sensor Interface Modules
Automotive sensor-interface modules that aggregate multiple analog sensors (throttle position, MAP, temperature, oxygen) benefit from the MAX1204ACAP's eight-channel capability and robust SPI interface. The 5 V analog supply tolerates 12 V battery transients after regulation, and the 3 V DVdd ties directly to modern automotive microcontrollers. While the part itself is commercial-grade (0C to +70C), the SSOP-20 footprint allows PCB reuse across non-safety automotive subsystems where extended temperature is not required. Designers must consider AEC-Q100 qualified ADCs for safety-critical or underhood modules; the MAX1204ACAP suits body and infotainment electronics with adequate thermal design.
推荐
Test & Measurement Front-Ends
Bench-top test and measurement equipment - multimeters, panel meters, calibration fixtures - relies on the MAX1204ACAP's multi-channel SAR architecture and integrated reference to digitize multiple analog signals accurately. The 3 V SPI interface allows direct connection to display-driving microcontrollers and front-panel processors. The internal 4.096 V reference simplifies calibration routines and reduces external component count. Although the device is 10-bit (limited for high-precision T&M), its linearity and small footprint make it attractive for cost-sensitive production-line testers where moderate resolution is acceptable. For higher precision the MAX1204BCAP+ (12-bit) or MAX1204BEAP+ are drop-in alternatives.
推荐
推荐产品汇总
工程参考数据： MAX1204ACAP ——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 | MAX1204ACAP+ | MAX1204BCAP+ | MAX1204AEAP+ | MAX1204BEAP+ | MAX1202ACAP |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 20-pin SSOP | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same |
| Resolution | 10 bit | 10 bit | 12 bit | 10 bit | 12 bit | 12 bit |
| Channels | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff |
关键差异点
- Drop-in lead-free RoHS replacement is widely available （对比 MAX1204ACAP+)
- Same SSOP-20 footprint, four-fold resolution upgrade available （对比 MAX1204BCAP+)
- Extended-temperature variant in same footprint （对比 MAX1204AEAP+ / MAX1204BEAP+)
设计说明
Place a 10 uF tantalum or ceramic bypass capacitor on AVdd (pin 20) as close to the device as possible, with a 0.1 uF ceramic in parallel for high-frequency noise. Tie AGND (pin 12) and DGND (pin 6) to a single ground plane only at the exposed pad to avoid ground-loop noise injection into the reference. Keep digital traces (SCLK, DOUT, CS) routed away from analog input traces to minimize capacitive coupling. Use a wide ground trace or pour under the SSOP-20 body to provide thermal relief and a low-impedance ground reference.
Do not exceed the absolute maximum AVdd of 5.25 V or the part will suffer permanent damage. When using the internal reference, leave REFADJ (pin 11) floating; tying it to AVdd disables the internal reference and forces the ADC to use AVdd as reference, which is rarely desired. According to the Maxim datasheet, the CS pin must be held low for the entire conversion cycle; a glitch on CS mid-conversion can corrupt the SAR register and produce erroneous data. Always clock out exactly 10 bits (or 12 bits for MAX1204BCAP+) per conversion before raising CS.
Route AIN0-AIN7 as parallel traces with consistent spacing to minimize channel-to-channel crosstalk. Place any input RC anti-alias filters within 5 mm of the ADC pins to limit noise injection from long analog traces. The 4.096 V reference is sensitive to AVdd noise; adding a small RC filter (10 ohm + 10 uF) on AVdd before the reference pin improves reference stability in high-noise environments. For best INL performance, drive analog inputs from low-impedance sources (< 1 kohm) so the input sampling capacitor settles within the acquisition time.
合规信息
Original MAX1204ACAP uses matte-tin (Pb-free) finish but is not RoHS-compliant per Maxim's lifecycle documentation. The MAX1204ACAP+ variant is RoHS-compliant. AEC-Q100 qualification not present for this part; for automotive applications use MAX1204BEAP+ or an AEC-Q100 qualified ADC.
