MAX1203AEPP - 12-Bit 8-Ch SAR ADC, 133ksps | Maxim Integrated
MPN: MAX1203AEPP ✗ Cuối đờiMAX1203AEPP Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho MAX1203AEPP — 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 MAX1203AEPP (cùng hình factor và footprint) — khác nhau ở Package, Resolution, Analog Supply Voltage, Operating Temperature, Mounting Type.
MAX1203AEPP+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1203ACPP+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1203BCPP+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1203BEPP+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1202ACAP
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MAX1147BEUP+T
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MAX1165BEUI+T
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MAX1203AEPP Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Number of Channels | 8 single-ended / 4 differential |
| Tỷ lệ lấy mẫu | 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 |
| Giao diện | SPI / QSPI / MICROWIRE-compatible serial (4-wire) |
| Track/Hold | Internal |
| Hộp | 20-pin PDIP (EPP) |
| Nhiệt độ hoạt động | -40 °C to +85 °C |
| Kiểu lắp đặt | Through-hole |
Cấu hình chân MAX1203AEPP
| Chân 1 | AIN1 — Analog input channel 1 |
| Chân 2 | AIN2 — Analog input channel 2 |
| Chân 3 | AIN3 — Analog input channel 3 |
| Chân 4 | AIN4 — Analog input channel 4 |
| Chân 5 | AV-DD — Analog +5V supply (also accepts +5V from ±5V dual supply) |
| Chân 6 | AV-SS — Analog ground return |
| Chân 7 | DV-DD — Digital interface supply, 2.7V to 5.25V (logic level reference) |
| Chân 8 | DGND — Digital ground |
| Chân 9 | AIN5 — Analog input channel 5 |
| Chân 10 | AIN6 — Analog input channel 6 |
| Chân 11 | AIN7 — Analog input channel 7 |
| Chân 12 | AIN8 — Analog input channel 8 |
| Chân 13 | AIN0 — Analog input channel 0 |
| Chân 14 | REF — Reference bypass pin; 4.7uF+0.1uF to AV-SS when internal reference used |
| Chân 15 | CS — Active-low chip select for serial interface |
| Chân 16 | DOUT — Serial data output (SPI/MICROWIRE) |
| Chân 17 | DIN — Serial data input (SPI/MICROWIRE) |
| Chân 18 | CCLK — Serial clock input |
| Chân 19 | SHDN — Power-down control, active-low (2 µA when asserted) |
| Chân 20 | V-SS — Negative analog supply for dual ±5V operation (tie to AV-SS for single +5V) |
Ứng dụng tiêu biểu
MAX1203AEPP phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX1203AEPP — 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 | 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 |
Bảo phân biệt quan trọng
- Industrial operating temperature grade (vsMAX1203ACPP+)
- Lower cost than the B-grade speed-up variant (vsMAX1203BCPP+)
- Dual-rail analog supply and 3V digital interface (vsMAX1203BEPP+)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
