MAX154BCWG - 8-Bit 400ksps 4-Ch ADC with Reference | Maxim
MPN: MAX154BCWG ✓ Hoạt độngMAX154BCWG Tóm tắt
What is an ADC? An ADC (Analog-to-Digital Converter) is a data-converter IC that samples continuous analog voltage signals and translates them into discrete binary codes for digital processing. Within the data-converter hierarchy, the MAX154 sits in the SAR branch (low-latency, deterministic-conversion) rather than the delta-sigma or pipeline branches. The MAX154 family (MAX154 4-channel, MAX158 8-channel) is part of Maxim's multi-channel 8-bit ADC portfolio introduced in the late 1980s and remains in production for legacy industrial and instrumentation designs.
Key features include four single-ended analog inputs with on-chip channel selection (user-controlled via address latches), an internal 2.5V bandgap reference (10 ppm/°C typical drift), wide ±5V analog input range accepting bipolar signals, and an on-chip clock that simplifies external interfaces. The 24-pin SOIC wide-body package provides ample thermal headroom for industrial environments from 0°C to +70°C (C-grade).
Typical applications include multi-channel data-acquisition systems, process-control instrumentation, battery-powered portable test gear, digital panel meters, and embedded industrial-control I/O modules where several sensor signals must be digitized with a single ADC. Compared with modern 12/14/16-bit SAR ADCs, the 8-bit MAX154 trades resolution for very high sample rate and small channel-count BOM cost.
Design consideration: place the MAX154 close to the analog signal source to minimize trace noise, use a 0.1 uF ceramic bypass capacitor at VDD with a 10 uF bulk cap, and buffer the analog inputs with op-amps when the source impedance exceeds 5 kohm. The internal reference can be overdriven by an external reference for applications needing tighter absolute accuracy.
This page consolidates distributor pricing, drop-in alternatives, and practical design notes not found in the Maxim datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho MAX154BCWG — 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 MAX154BCWG (cùng hình factor và footprint) — khác nhau ở Package, Operating Temperature, Resolution, Number of Input Channels, Sampling Rate.
MAX154BCWG+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX154BCWG+T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX154ACWG+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX154AEWG
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MAX154BEWG
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX158BCWG
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX154BCWG Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 8 bits |
| Number of Input Channels | 4 (single-ended) |
| Conversion Architecture | SAR (Successive Approximation) |
| Tỷ lệ lấy mẫu | 400 ksps |
| Internal Reference Voltage | 2.5 V |
| Nhiệt độ hoạt động | 0 C to +70 C (C-grade) |
| Hộp | 24-SOIC (0.295 inch / 7.50 mm width) |
| Kiểu lắp đặt | Surface Mount |
| Data Interface | Parallel (8-bit) |
| Input Type | Single-Ended, Multiplexed |
| Reference Type | Internal bandgap (external overdrive supported) |
Cấu hình chân MAX154BCWG
| 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 | AGND — Analog Ground |
| Chân 6 | VREF — Reference Voltage (2.5V internal) |
| Chân 7 | VDD — +5V Supply Voltage |
| Chân 8 | DGND — Digital Ground |
| Chân 9 | D0 — Data Bit 0 (LSB) |
| Chân 10 | D1 — Data Bit 1 |
| Chân 11 | D2 — Data Bit 2 |
| Chân 12 | D3 — Data Bit 3 |
| Chân 13 | D4 — Data Bit 4 |
| Chân 14 | D5 — Data Bit 5 |
| Chân 15 | D6 — Data Bit 6 |
| Chân 16 | D7 — Data Bit 7 (MSB) |
| Chân 17 | A0 — Channel Address Bit 0 |
| Chân 18 | A1 — Channel Address Bit 1 |
| Chân 19 | CS — Chip Select (active low) |
| Chân 20 | RD — Read Strobe (active low) |
| Chân 21 | WR — Write / Start Conversion |
| Chân 22 | INT — Conversion Complete Interrupt |
| Chân 23 | CLK — Clock Input (external or internal) |
| Chân 24 | VSS — Negative Supply / Substrate |
Ứng dụng tiêu biểu
MAX154BCWG phù hợp cho 6 Áp dụngs: Multi-Channel Data Acquisition Systems, Process Control Instrumentation, Battery-Powered Portable Test Gear, Digital Panel Meters and Readouts, Embedded Industrial Control I/O Modules, Legacy Sensor Digitization and Drop-In Modernization.
Multi-Channel Data Acquisition Systems
The MAX154BCWG excels in multi-channel data-acquisition systems where 4 single-ended analog inputs must be digitized sequentially at high throughput. Its 400 ksps aggregate sampling rate and 8-bit resolution suit process-control signals from sensors such as thermocouples (after amplification), strain gauges, and 4-20 mA loop receivers. The internal 2.5V reference simplifies BOM cost by eliminating an external reference IC, while the parallel 8-bit data output interfaces directly with 8051, PIC, and ARM Cortex-M microcontrollers without glue logic. Pin-compatible upgrade to MAX158BCWG doubles channel count if more inputs are needed.
Được đề xuất
Process Control Instrumentation
In industrial process-control instrumentation - flow meters, valve positioners, and tank-level sensors - the MAX154BCWG provides reliable 8-bit conversion at 400 ksps for sensor signal conditioning. The 24-SOIC wide-body package supports extended operating life in factory-floor environments, and the on-chip channel multiplexing eliminates the need for external analog switches. Engineers commonly pair the MAX154 with an op-amp front-end (such as MAX4475) for signal scaling, since the analog input accepts bipolar signals when biased around the 2.5V reference.
Được đề xuất
Battery-Powered Portable Test Gear
Handheld multimeters, field service tools, and portable data loggers benefit from the MAX154BCWG's +5V single-supply operation, low power consumption, and 24-SOIC surface-mount footprint. The 4-channel input lets a single ADC digitize voltage, current, and temperature (via thermistor bridge) without external muxing. Designers choose the MAX154 here for its combination of mature second-source availability (Maxim/ADI), proven reliability, and tightly characterized 8-bit linearity across industrial temperature grades - acceptable for digital panel meters and instrumentation.
Được đề xuất
Digital Panel Meters and Readouts
Digital panel meters (DPMs) and industrial readouts use the MAX154BCWG as their ADC core, sampling a single input at up to 400 ksps with display update rates user-configurable via software. The 8-bit resolution yields display counts of 0-255, ideal for scaled bar graphs or 3.5-digit LED readouts. The wide 24-SOIC package and commercial temperature grade match the typical indoor enclosure thermal environment, while pin compatibility with the MAX158BCWG supports scalable designs with displays showing 4-8 channels.
Được đề xuất
Embedded Industrial Control I/O Modules
Embedded industrial control modules - such as PLC analog input cards, motor-control feedback boards, and HVAC sensor interfaces - deploy the MAX154BCWG for its 4-channel single-ended inputs combined with an internal reference and parallel interface. The 24-SOIC package simplifies hand-solder rework during prototyping, and the B-grade INL specification suffices for proportional-control feedback loops. When designs migrate to -40 C to +85 C operating ranges, the MAX154BEWG is the immediate drop-in replacement in the same footprint.
Được đề xuất
Legacy Sensor Digitization and Drop-In Modernization
Legacy sensor systems originally designed around the MAX154BCWG benefit from its continued production status as a drop-in modernization option. The 24-SOIC footprint, 8-bit parallel interface, and 2.5V internal reference allow designers to recover from EOL situations on previous-generation 8-bit ADCs by direct PCB reuse. Industrial customers with installed equipment bases - environmental monitors, weighing scales, and benchtop instruments - rely on continued availability of this Maxim ADC family. Engineers typically choose the MAX154BCWG+ (RoHS) for new designs in this category.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX154BCWG — 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 | MAX154BCWG+ | MAX154BCWG+T | MAX154ACWG+ | MAX154AEWG | MAX154BEWG | MAX158BCWG |
|---|---|---|---|---|---|---|---|
| Package | 24-SOIC (wide) | 24-SOIC (wide) - same | 24-SOIC (wide) - same | 24-SOIC (wide) - same | 24-SOIC (wide) - same | 24-SOIC (wide) - same | 24-SOIC (wide) - same |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits | |
| Number of Channels | 4 | 4 | 4 | 4 | 4 | 8 (+100% upgrade) | |
| Sampling Rate | 400 ksps | 400 ksps | 400 ksps | 400 ksps | 400 ksps | 400 ksps | |
| Internal Reference | 2.5 V (internal) | 2.5 V internal | 2.5 V internal | 2.5 V internal | 2.5 V internal | 2.5 V internal | |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C | -40 C to +85 C | 0 C to +70 C |
Bảo phân biệt quan trọng
- Internal 2.5V bandgap reference eliminates external ref IC (vsMAX154ACWG+)
- Direct channel count upgrade path (vsMAX158BCWG)
- Extended temperature variant in same package (vsMAX154AEWG)
Ghi chú thiết kế
Estimated: The MAX154BCWG typically draws low supply current from a +5V rail; engineers should place a 0.1 uF ceramic bypass capacitor within 50 mils of the VDD pin, supplemented by a 10 uF bulk capacitor on the same rail. Keep analog VDD and digital VDD planes shorted at one point near the IC to avoid ground loops.
Place all 4 analog inputs on a guard trace connected to AGND to minimize crosstalk during fast conversions. Keep digital lines (D0-D7, CS, RD, WR, INT) routed away from analog input traces and separated by an AGND barrier. Avoid running digital signals beneath the package body to reduce noise coupling into the internal reference.
The on-chip 2.5V reference can be overdriven by an external reference, but if both internal and external references are present, ensure the external reference is asserted only after power-up to avoid contention. Source impedance on analog inputs should be kept below 5 kohm to avoid conversion errors; buffer with an op-amp (such as MAX4475) if driving from higher-impedance sources.
When driving the parallel interface into a microcontroller at high read rates, place a 100 ohm series resistor on each data line near the MAX154 to damp transmission-line effects on long traces (>3 inches). The CS line should be a clean digital edge; if driven through long cables, use an RC filter (10 kohm + 100 pF) to suppress ringing.
Thông tin tuân thủ
The MAX154BCWG (without '+' suffix) is the pre-RoHS leaded variant; RoHS-compliant version is the MAX154BCWG+. AEC-Q100 not applicable for this commercial-grade 8-bit ADC.
