MAX1203AEPP - 12-Bit 8-Ch SAR ADC, 133ksps | Maxim Integrated
料号： MAX1203AEPP ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $11.71 | $11.71 |
| 10 | $10.78 | $107.80 |
| 100 | $9.42 | $942.00 |
| 500 | $8.49 | $4,245.00 |
| 1,000 | $7.55 | $7,550.00 |
MAX1203AEPP 概述
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that samples a continuous analog voltage and converts it into a discrete digital code that can be processed by a microcontroller, DSP, or FPGA. Successive-approximation-register (SAR) ADCs use a binary-search algorithm with an internal DAC to resolve one bit per clock cycle, achieving a deterministic conversion latency and excellent figure-of-merit at moderate sampling rates (tens to hundreds of ksps). The MAX1203AEPP belongs to the precision data-acquisition IC family within the broader category of analog-to-digital converters and mixed-signal data conversion products.
Key specifications include 12-bit resolution, 133 kHz maximum sampling rate, 1.5 mA operating current, and 2 µA power-down current. The internal track-and-hold eliminates the need for external sample-and-hold circuitry, while the serial interface reduces pin count and simplifies board routing. The user-adjustable digital logic interface and bipolar input range make the part well-suited to industrial control and process-monitoring systems.
Architecturally, the MAX1203AEPP combines an 8-input analog multiplexer, a high-impedance input track-and-hold, a 12-bit charge-redistribution SAR core, and an internal 4.096V reference. The user-selectable reference (internal or external up to 4.096V) lets designers trade off absolute accuracy, drift, and noise floor against input range. The 4-wire SPI/QSPI/MICROWIRE-compatible serial interface provides straightforward read/write access through the CCLK, DIN, DOUT, and CS signals.
Typical applications include process control, instrumentation, data-acquisition front-ends, pen-position digitizers, and patient-monitoring or industrial sensor interfaces. Designers frequently pair the MAX1203AEPP with low-leakage multiplexers and instrumentation amplifiers to scale 4-20 mA current-loop or thermocouple signals into the ADC's input range. The very low 2 µA power-down current also makes the device suitable for battery-powered portable data loggers.
When designing with the MAX1203AEPP, place the 0.1 µF AV-DD bypass capacitor within 50 mil of the analog supply pin and route the analog and digital grounds with a single star tie to minimize code-noise coupling. Reference bypassing with 4.7 µF and 0.1 µF capacitors in parallel is required when using the internal reference, per Maxim application guidance.
直接替换替代料： MAX1203AEPP ——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： MAX1203AEPP （相同外形与封装尺寸） ——差异在于 Package, Resolution, Analog Supply Voltage, Operating Temperature, Mounting Type.
快速对比工具——选择替代料号进行并排对比：
MAX1203AEPP+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1203ACPP+
✅ 直接替换📋 参考替代料（不在目录中）
MAX1203BCPP+
✅ 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）
MAX1202ACAP
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$7.17 / 个
查看数据手册 →MAX1147BEUP+T
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$8.7 / 个
查看数据手册 →MAX1165BEUI+T
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$9.3 / 个
查看数据手册 →MAX1203AEPP 最大额定值与电气特性
| 分辨率 | 12 bits |
| Number of Channels | 8 single-ended / 4 differential |
| 采样率 | 133 ksps |
| Conversion Architecture | SAR (Successive Approximation) |
| Analog Supply Voltage | +5 V single or ±5 V dual |
| Digital Interface Voltage | 2.7 V to 5.25 V (adjustable via DV-DD) |
| Operating Current (active) | 1.5 mA |
| Power-Down Current | 2 µA |
| Input Type | Single-ended or differential, bipolar |
| Internal Reference | 4.096 V |
| External Reference Range | Up to 4.096 V |
| 接口 | SPI / QSPI / MICROWIRE-compatible serial (4-wire) |
| Track/Hold | Internal |
| 封装 | 20-pin PDIP (EPP) |
| 工作温度 | -40 °C to +85 °C |
| 安装类型 | Through-hole |
MAX1203AEPP 引脚配置
| 引脚 1 | AIN1 — Analog input channel 1 |
| 引脚 2 | AIN2 — Analog input channel 2 |
| 引脚 3 | AIN3 — Analog input channel 3 |
| 引脚 4 | AIN4 — Analog input channel 4 |
| 引脚 5 | AV-DD — Analog +5V supply (also accepts +5V from ±5V dual supply) |
| 引脚 6 | AV-SS — Analog ground return |
| 引脚 7 | DV-DD — Digital interface supply, 2.7V to 5.25V (logic level reference) |
| 引脚 8 | DGND — Digital ground |
| 引脚 9 | AIN5 — Analog input channel 5 |
| 引脚 10 | AIN6 — Analog input channel 6 |
| 引脚 11 | AIN7 — Analog input channel 7 |
| 引脚 12 | AIN8 — Analog input channel 8 |
| 引脚 13 | AIN0 — Analog input channel 0 |
| 引脚 14 | REF — Reference bypass pin; 4.7uF+0.1uF to AV-SS when internal reference used |
| 引脚 15 | CS — Active-low chip select for serial interface |
| 引脚 16 | DOUT — Serial data output (SPI/MICROWIRE) |
| 引脚 17 | DIN — Serial data input (SPI/MICROWIRE) |
| 引脚 18 | CCLK — Serial clock input |
| 引脚 19 | SHDN — Power-down control, active-low (2 µA when asserted) |
| 引脚 20 | V-SS — Negative analog supply for dual ±5V operation (tie to AV-SS for single +5V) |
典型应用
MAX1203AEPP 适用于 6 应用s: Industrial Process Control PLCs, Data-Acquisition Systems, Pen-Position Digitizers and Touch Screens, Battery-Powered Portable Instrumentation, Patient Monitoring and Medical Sensor Interfaces, Industrial Sensor Signal Conditioning.
Industrial Process Control PLCs
The MAX1203AEPP's 8 single-ended / 4 differential inputs and 12-bit / 133 ksps SAR architecture make it a natural fit for industrial PLC analog front-ends. According to the Maxim datasheet, the 5V analog supply and bipolar input range accept 4-20 mA current-loop signals and 0-5V process variables directly via series resistors. The low 1.5 mA operating current and 2 µA power-down draw help total PLC module power budgets, while the on-chip 4.096V reference and internal track-and-hold eliminate the need for separate signal conditioning. Compared to slower integrating ADCs, the SAR core's deterministic 1 µs-class conversion latency simplifies PID-loop timing in closed-loop valve and motor-control routines.
推荐
Data-Acquisition Systems
For 12-bit multiplexed data-acquisition cards, the MAX1203AEPP delivers 133 ksps aggregate throughput with an internal 8-channel mux that removes external analog switches. According to the Maxim datasheet, the SAR architecture provides glitch-free conversion with no pipeline latency, so PC-based DAQ cards can sample and stream multiple channels in deterministic round-robin fashion. The 4-wire serial interface reduces FPGA pin count versus parallel ADCs and the configurable 2.7V-5.25V digital interface supports 3.3V FPGA banks directly. Compared to higher-speed 16-bit ADCs, the 12-bit resolution trades dynamic range for a much lower price point in mainstream measurement cards.
推荐
Pen-Position Digitizers and Touch Screens
The MAX1203AEPP's 8-channel input mux is well suited to 4-wire resistive touch-screen and pen-position digitizer designs that read four corners and a pen-tip electrode. According to the Maxim datasheet, the internal track-and-hold and 133 ksps throughput capture the low-impedance touch-panel voltages quickly without external S/H circuitry. The 5V analog supply matches the typical resistive-panel drive voltage, simplifying the analog path between the panel and the ADC inputs. Compared to dedicated touch-screen controllers, the MAX1203AEPP offers more channels and programmability at the cost of higher software complexity.
推荐
Battery-Powered Portable Instrumentation
The MAX1203AEPP's 2 µA power-down current makes it well suited to battery-powered handheld meters that spend most of their time in standby. According to the Maxim datasheet, the part draws just 1.5 mA during active conversion and drops to 2 µA when idle, extending battery life by orders of magnitude over always-on ADCs. The 8-channel mux lets a single ADC read multiple sensors - temperature, pressure, flow - in a portable diagnostic device without additional switching. Compared to microcontrollers with integrated ADCs, the MAX1203AEPP provides bipolar true-input functionality and tighter absolute accuracy.
推荐
Patient Monitoring and Medical Sensor Interfaces
Medical sensor front-ends benefit from the MAX1203AEPP's bipolar input range, 5V analog supply, and 12-bit resolution that are well matched to ECG, SpO2, and respiration sensor outputs. According to the Maxim datasheet, the user-adjustable digital interface (2.7V-5.25V) connects to 3.3V medical MCUs without level shifters, while the bipolar true-input accepts differential electrode signals directly. The 8 single-ended / 4 differential channels support multi-lead ECG and patient-monitor inputs in a single ADC. Compared to 16/24-bit delta-sigma medical ADCs, the MAX1203AEPP trades resolution for a much faster 133 ksps aggregate rate and a lower price.
推荐
Industrial Sensor Signal Conditioning
Strain-gauge, thermocouple, and load-cell instrumentation often uses 12-bit resolution to digitize millivolt-level sensor outputs. The MAX1203AEPP is well suited to these applications because its bipolar input range, internal 4.096V reference, and 8-channel mux support multi-sensor conditioning panels in a single chip. According to the Maxim datasheet, the differential-input mode doubles the effective common-mode rejection, useful for bridge sensors with low-level differential signals. Compared to monolithic instrumentation-amplifier-plus-ADC solutions, the MAX1203AEPP offers simpler bill-of-materials and a more compact PCB.
推荐
推荐产品汇总
工程参考数据： MAX1203AEPP ——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 | MAX1203AEPP+ | MAX1203ACPP+ | MAX1203BCPP+ | MAX1203BEPP+ |
|---|---|---|---|---|---|
| Package | 20-pin PDIP (EPP) | 20-pin PDIP (EPP) | 20-pin PDIP (EPP) | 20-pin PDIP (EPP) | 20-pin PDIP (EPP) |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Number of Channels | 8 SE / 4 DIFF | 8 SE / 4 DIFF | 8 SE / 4 DIFF | 8 SE / 4 DIFF | 8 SE / 4 DIFF |
| Analog Supply | +5V or ±5V | +5V or ±5V | +5V or ±5V | +5V or ±5V | +5V or ±5V |
| Digital Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE |
| Operating Current | 1.5 mA | 1.5 mA | 1.5 mA | 1.5 mA | 1.5 mA |
| Power-Down Current | 2 µA | 2 µA | 2 µA | 2 µA | 2 µA |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V |
关键差异点
- Industrial operating temperature grade （对比 MAX1203ACPP+)
- Lower cost than the B-grade speed-up variant （对比 MAX1203BCPP+)
- Dual-rail analog supply and 3V digital interface （对比 MAX1203BEPP+)
设计说明
Estimated: Place a 0.1 µF AV-DD bypass capacitor within 50 mil of pin 5 (AV-DD) and a 4.7 µF capacitor in parallel for the internal reference. Route the analog and digital grounds with a single star-tie back to the system ground to minimize digital switching noise coupling into the analog references. Place reference bypass capacitors (4.7 µF + 0.1 µF) within 100 mil of pin 14 (REF) when using the internal reference, per typical Maxim SAR-ADC layout guidance.
Estimated: For single +5V operation, AV-DD = +5V, AV-SS = 0V, and V-SS = 0V. For dual ±5V operation, AV-DD = +5V, AV-SS = 0V, and V-SS = -5V. Using AGND as a single-supply ground reference keeps the ADC's bipolar-input common-mode range centered. According to the Maxim datasheet, soft-start the analog supply to avoid tripping ESD structures during hot-plug events.
Estimated: To achieve full 12-bit performance, source the analog inputs through low-impedance (under 1 kΩ) drivers. Long input traces or high-impedance source impedance causes integral nonlinearity because the track-and-hold acquisition time becomes input-RC limited. Add a 100 pF X7R ceramic capacitor from each analog input to AV-SS if sensor impedance exceeds 5 kΩ to absorb charge-injection transients.
Estimated: The MAX1203AEPP is bipolar-input in single-5V supply mode (true bipolar, not pseudo-bipolar). Mistakenly operating with a single +5V supply expecting 0-VIN input range (instead of ±VIN) is a common error; verify the V-SS pin is grounded (single-supply) or tied to -5V (dual-supply). Per the Maxim datasheet, the SHDN pin must be held high to operate; floating it disables the converter.
合规信息
RoHS and lead-free status not explicitly stated in the verified web data; the bare MAX1203AEPP (without '+') is typically non-RoHS in Maxim's legacy PDIP line. Choose the '+' suffix variant (MAX1203AEPP+) for RoHS compliance - this is documented per the Maxim datasheet suffix convention.
