ADC12H038CIWMX - 12-Bit+Sign SAR ADC 8-Channel 28-SOIC | TI
MPN: ADC12H038CIWMX ✗ Cuối đờiADC12H038CIWMX Tóm tắt
An SAR (successive-approximation register) ADC is one of the primary categories of analog-to-digital converters, alongside Delta-Sigma, pipeline, and dual-slope architectures. SAR ADCs use a binary-search algorithm against an internal DAC, providing deterministic latency, low power consumption, and excellent behavior for multiplexed multi-channel data-acquisition systems. ADC12H038CIWMX belongs to the data-acquisition IC family and is positioned between simple 8-bit SARs and 16-bit+ precision converters, offering an excellent balance for medium-resolution multi-channel sensing.
Key features include eight input channels routed through an internal analog multiplexer, built-in self-calibration (offset and gain) that the device performs automatically, a sample/hold front end that captures fast signals, and a serial data output that minimizes pin count. The part operates from -40 C to +85 C industrial temperature range and is offered in a 28-SOIC (7.50 mm body width) for robust through-hole-style hand soldering and inspection.
Technically, the device combines a charge-redistribution DAC with auto-zeroing and self-calibration logic that periodically trims offset and linearity errors, maintaining accuracy across the 4.5 V to 5.5 V supply range. The serial interface (DI, DO, CS, CLK) follows the NSC MICROWIRE/QSPI-compatible protocol, allowing direct connection to most microcontrollers and DSPs without glue logic.
Typical applications include multi-channel industrial sensor monitoring, portable instrumentation, process-control front ends, and medical monitoring equipment. The wide temperature range and self-calibration make it well-suited for factories, remote data loggers, and battery-powered measurement devices.
When designing with this ADC, ensure the analog and digital supplies share a clean ground return and add 100 nF decoupling close to AVDD/DVDD pins. Calibration runs automatically on power-up; allow at least 100 ms before valid conversions are issued after supply stabilization.
This page aggregates pricing tiers, drop-in pin-compatible alternatives in the same 28-SOIC footprint, and practical design notes not found in the manufacturer datasheet. All values are referenced from DigiKey, Mouser, and the TI/National Semiconductor datasheet family.
Bộ thay thế dễ dàng lắp đặt cho ADC12H038CIWMX — 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 ADC12H038CIWMX (cùng hình factor và footprint) — khác nhau ở Input Type, Data Interface, Package, Architecture, Operating Temperature.
ADC12038CIWM/NOPB
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADC12038CIWMX
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADC12030CIWM/NOPB
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADC12032CIWM/NOPB
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADC12L038CIWM/NOPB
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADC10738CIWMX
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ADC10158CIWMX/NOPB
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ADC12H038CIWMX Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bit + sign (13-bit dynamic range) |
| Number of Input Channels | 8 single-ended / 4 pseudo-differential |
| Architecture | SAR (Successive Approximation) |
| Sample/Hold | Integrated |
| Analog Supply Voltage | 4.5 V to 5.5 V |
| Digital Supply Voltage | 4.5 V to 5.5 V |
| Data Interface | NSC MICROWIRE-compatible serial (SPI/QSPI) |
| Tỷ lệ lấy mẫu | Up to 73.7 kS/s (typical) |
| Self-Calibration | Yes (offset and gain, auto on power-up) |
| Phạm vi điện áp đầu vào | 0 V to VREF (unipolar); ±VREF (with sign bit) |
| Điện áp tham chiếu | External (typically 2.5 V or 5 V) |
| Nhiệt độ hoạt động | -40 C to +85 C |
| Hộp | 28-SOIC (DW), 7.50 mm body width |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 1 (unlimited) |
| Trạng thái RoHS | Compliant (lead-free SOIC variant) |
| Input Type | Single-ended, pseudo-differential, or differential (sign bit) |
Cấu hình chân ADC12H038CIWMX
| Chân 1 | VREF+ — Positive reference voltage input |
| Chân 2 | VREF- — Reference ground / negative reference |
| Chân 3 | AGND — Analog ground |
| Chân 4 | AVDD — Analog supply (4.5 V to 5.5 V) |
| Chân 5 | DVDD — Digital supply (4.5 V to 5.5 V) |
| Chân 6 | DGND — Digital ground |
| Chân 7 | CAL — Calibration pin (active low) |
| Chân 8 | SCLK — Serial clock input (MICROWIRE) |
| Chân 9 | DI — Serial data input to ADC |
| Chân 10 | DO — Serial data output from ADC |
| Chân 11 | CS — Chip select (active low) |
| Chân 12 | EOC — End-of-conversion output (active low) |
| Chân 13 | PD — Power-down input (active high) |
| Chân 14 | MUXOUT0 — Mux output bit 0 (channel select) |
| Chân 15 | MUXOUT1 — Mux output bit 1 (channel select) |
| Chân 16 | MUXOUT2 — Mux output bit 2 (channel select) |
| Chân 17 | CH0 — Analog input channel 0 |
| Chân 18 | CH1 — Analog input channel 1 |
| Chân 19 | CH2 — Analog input channel 2 |
| Chân 20 | CH3 — Analog input channel 3 |
| Chân 21 | CH4 — Analog input channel 4 |
| Chân 22 | CH5 — Analog input channel 5 |
| Chân 23 | CH6 — Analog input channel 6 |
| Chân 24 | CH7 — Analog input channel 7 |
| Chân 25 | VIN+ — Positive analog input (pseudo-differential) |
| Chân 26 | VIN- — Negative analog input (pseudo-differential) |
| Chân 27 | NC — Not connected (per datasheet) |
| Chân 28 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
ADC12H038CIWMX phù hợp cho 6 Áp dụngs: Multi-Channel Industrial Sensor Monitoring, Portable Battery-Powered Data Loggers, Process Control Front-End (PLC), Medical Patient Monitoring Equipment, Automotive Sensor Interface Modules, Test & Measurement Instrumentation.
Multi-Channel Industrial Sensor Monitoring
The ADC12H038CIWMX's 8-channel input multiplexer, 12-bit+sign resolution, and built-in self-calibration make it well-suited for factory-floor multi-sensor panels that read thermocouples, pressure transducers, and 4-20 mA loop signals sequentially. The MICROWIRE-compatible serial interface connects directly to most 5 V industrial microcontrollers without glue logic, and the SAR architecture delivers deterministic per-channel conversion latency - critical for synchronous control loops. Combined with the -40 C to +85 C industrial temperature range, the part handles harsh factory environments without performance drift. Power dissipation is modest because conversion only occurs on the active channel.
Được đề xuất
Portable Battery-Powered Data Loggers
Battery-powered data loggers benefit from the ADC12H038CIWMX's low duty-cycle operation and 4.5 V-5.5 V supply that pairs with a single Li-ion cell via boost converter. The self-calibration on power-up eliminates periodic field recalibration, and the SAR architecture only consumes power during active conversions - ideal for sleep/wake cycle designs where the MCU reads sensors every few seconds. The integrated sample/hold captures fast transient signals such as shock or vibration from MEMS accelerometers. The serial MICROWIRE interface allows a single MCU pin to wake the ADC only when needed, extending battery life.
Được đề xuất
Process Control Front-End (PLC)
The ADC12H038CIWMX provides 12-bit+sign resolution and 8 channels in a 28-SOIC package that fits standard PLC analog input modules. Its pseudo-differential input mode supports 4-20 mA loop receivers with proper scaling, and the SAR architecture delivers the deterministic latency required for closed-loop control at fixed cycle times (typically 10-100 ms per channel scan). The self-calibration feature trims offset/gain errors that accumulate in field-installed modules, while the MICROWIRE-compatible interface links to industrial microcontrollers with deterministic timing. This part also meets the -40 C to +85 C industrial grade essential for PLC rack modules.
Được đề xuất
Medical Patient Monitoring Equipment
Medical equipment such as multi-parameter patient monitors and bedside data acquisition units benefit from the ADC12H038CIWMX's 12-bit+sign resolution and built-in self-calibration that ensures measurement accuracy across the device lifetime. The 8-channel MUX sequentially digitizes ECG leads, SpO2 signals, temperature probes, and respiration transducers through a single ADC, reducing board space and BOM cost. The wide operating temperature range supports hospital and ambulatory environments, while the SAR architecture provides stable conversion rates crucial for synchronized multi-channel waveform capture.
Được đề xuất
Automotive Sensor Interface Modules
The ADC12H038CIWMX serves automotive body and chassis sensor interface modules reading multiple 0-5 V analog inputs such as throttle position, fluid levels, and temperature sensors through a single MUX-ed ADC. Its industrial temperature rating (-40 C to +85 C) covers most cabin and underhood sensor locations, though for AEC-Q100 automotive qualification consider TI's automotive-grade SAR ADC family instead. The MICROWIRE-compatible interface easily connects to 5 V automotive microcontrollers like the TMS470 family. The self-calibration runs on every power-up, ensuring consistent readings across cold-crank and load-dump events.
Được đề xuất
Test & Measurement Instrumentation
Bench-top multi-meters, data acquisition systems, and laboratory instruments benefit from the ADC12H038CIWMX's 12-bit+sign resolution and flexible single-ended/pseudo-differential input modes that support various transducer outputs. The 28-SOIC package suits hand-assembled prototype instrumentation, and the SAR architecture provides the deterministic conversion latency needed for triggered sampling in scope-like instruments. Self-calibration reduces drift in long-term unattended installations, while the MICROWIRE-compatible serial interface allows FPGA-based acquisition engines to read channels via SPI.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADC12H038CIWMX — 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 | ADC12038CIWM/NOPB | ADC12038CIWMX | ADC12030CIWM/NOPB | ADC12032CIWM/NOPB | ADC12L038CIWM/NOPB |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 28-SOIC (DW) | 28-SOIC (DW) - same | 28-SOIC (DW) - same | 28-SOIC (DW) - same | 28-SOIC (DW) - same | 28-SOIC (DW) - same |
| Resolution | 12 bit + sign | 12 bit + sign | 12 bit + sign | 12 bit (no sign) | 12 bit (no sign) | 12 bit + sign |
| Number of Input Channels | 8 / 4 pseudo-diff | 8 / 4 pseudo-diff | 8 / 4 pseudo-diff | Single (1) | 2 / 1 pseudo-diff | 8 / 4 pseudo-diff |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 2.7 V to 3.6 V (3 V variant) |
| Data Interface | MICROWIRE serial | MICROWIRE serial | MICROWIRE serial | MICROWIRE serial | MICROWIRE serial | MICROWIRE serial |
| Self-Calibration | Yes | Yes | Yes | Yes | Yes | Yes |
| Lifecycle Status | NRND | Active | NRND | NRND | NRND | Active |
Bảo phân biệt quan trọng
- Built-in 8-channel analog multiplexer with self-calibration (vsDiscrete ADC + external MUX designs)
- 12-bit plus sign bit for bipolar inputs without external conditioning (vsStandard 12-bit SAR ADCs (e.g., ADC0808 family))
- Pin-compatible 28-SOIC footprint shared with ADC12038 family (vsADC10738CIWMX (10-bit variant in same package))
Ghi chú thiết kế
Decouple AVDD and DVDD with separate 100 nF X7R ceramic capacitors placed as close as possible to the respective pins, with a 10 uF bulk tantalum or ceramic on each rail. Use a star-ground topology tying AGND and DGND at a single point beneath the IC to avoid digital switching currents polluting the analog reference ground. The 4.5 V to 5.5 V supply range tolerates typical LDO outputs (e.g., LM7805) without requiring precise regulation.
Route the analog input traces (CH0-CH7, VIN+/VIN-) as a guard-bus pattern, keeping them away from digital SCLK/DI/DO/CS traces. Add a ground fill on both sides of the analog input layers. The MICROWIRE-compatible serial interface runs at modest clock rates; use series resistors (33 ohm) on SCLK and DO if long PCB traces are present to suppress ringing on rising edges.
Do not skip the VREF decoupling: place a 100 nF ceramic directly between VREF+ and VREF-, plus a 10 uF bulk capacitor. Self-calibration runs automatically on power-up - allow at least 100 ms after supply stabilization before reading the first valid conversion, otherwise the first few samples may be invalid. Driving CS low without a valid SCLK sequence can leave the part in an undefined state; always reset by toggling CS high-then-low before initiating a conversion sequence.
Thông tin tuân thủ
RoHS compliant per TI 28-SOIC lead-free part marking. Not AEC-Q100 qualified (industrial grade, -40C to +85C). Halogen-free status was not stated in verified data; treat as unknown. Conflict-minerals compliant per TI standard policy.
