MAX189BC/D - 12-Bit SAR ADC, Serial, 75ksps | Maxim Integrated
MPN: MAX189BC/D ✓ Hoạt độngMAX189BC/D Tóm tắt
A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of ADC that converts an analog input to a digital output using a binary-search algorithm against an internal DAC. SAR ADCs balance conversion speed, power consumption, and resolution, making them the workhorse of medium-speed data-acquisition applications such as industrial sensors, handheld instruments, and process-control front-ends. In the broader IC taxonomy, an SAR ADC sits under Data Converters -> ADCs -> Medium-Speed ADCs -> Power-Efficient ADCs.
Key features of the MAX189BC/D include +/- 1/2 LSB integral nonlinearity (INL), a fast 1.5-microsecond acquisition-time track/hold, an internal 4.096V reference that can also drive external loads, a hardware- or software-controllable shutdown mode that drops supply current to 2 microamps, and 1.5 mA operating current. The serial interface is compatible with SPI, QSPI, and MICROWIRE, easing connection to most modern microcontrollers and DSPs without external glue logic.
The MAX189BC/D's architecture uses a capacitive-charge-distribution DAC at its core, with a precision comparator and SAR logic, plus an integrated reference and reference buffer. The "C" speed grade and "B" resolution grade (with +/- 1 LSB INL vs. the A grade +/- 1/2 LSB) make the BC variant an attractive cost-optimized option. The bare-die format allows hybrid-module integrators and MCM (multi-chip-module) designers to minimize parasitic inductance and shrink board area beyond what packaged parts permit.
Typical applications include portable data loggers, pen-tablet digitizers, battery-powered instrumentation, isolated sensor read-out stages, and industrial process-control front-ends. The combination of a single +5V supply, low power, and serial output suits distributed measurement nodes and space-constrained designs.
When designing with the MAX189BC/D, provide a clean analog ground plane separate from the noisy digital return, bypass VDD with a 0.1 microfarat ceramic close to each die supply bond, and use the SHDN pin for duty-cycling to extend battery life. The internal reference can source up to several hundred microamps; if your design also needs a reference for external ADCs, budget that current draw into the worst-case accuracy calculation.
This page synthesizes distributor pricing, pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho MAX189BC/D — 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 MAX189BC/D (cùng hình factor và footprint) — khác nhau ở Conversion Time, Sampling Rate, Track/Hold Acquisition Time, Shutdown Current, Supply Voltage.
MAX189CC/D
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX189AC/D
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX187BC/D
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MAX187BCPA
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX189BC/D Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Number of Inputs | 1 single-ended |
| Conversion Type | SAR (Successive Approximation) |
| Phạm vi điện áp đầu vào | 0 V to 5 V |
| Điện áp cung cấp | +5 V (single supply) |
| Tỷ lệ lấy mẫu | 75 ksps maximum |
| Conversion Time | 8.5 us (typ) |
| Track/Hold Acquisition Time | 1.5 us (typ) |
| Internal Reference Voltage | 4.096 V (buffered) |
| Integral Nonlinearity (INL) | +/- 1 LSB (B grade) |
| Operating Current (active) | 1.5 mA (typ) |
| Điện áp tắt | 2 uA (typ) |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible, 3-wire |
| Hộp | Die (unpackaged bare die) |
| Temperature Grade | Commercial |
Hướng dẫn cấu hình chân MAX189BC/D die (unpackaged bare die)
Cấu hình chân cho MAX189BC/D (die (unpackaged bare die) gói). Thành phần số hiệu này có chân đầu vào, đầu ra và nguồn cung cấp. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết cấu hình chân bù, bù trừ và chân kích hoạt. Hoàn hảo cho điều kiện tín hiệu và mạch khuếch đại.
Không có dữ liệu chân cụ thể sẵn có cho MAX189BC/D.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
MAX189BC/D phù hợp cho 7 Áp dụngs: Portable Data Loggers, Battery-Powered Instrumentation, Industrial Process Control Front-Ends, Pen-Tablet Digitizers and Touch Sensing, Isolated Sensor Read-Out Stages, Hybrid Module and MCM Designs, Handheld Test and Measurement.
Portable Data Loggers
The MAX189BC/D fits portable data loggers because it draws only 1.5 mA in active mode and falls to 2 uA in hardware shutdown, extending battery life across multi-week acquisition campaigns. Its 12-bit resolution and 75 ksps throughput comfortably digitize slow-channel thermocouples, strain gauges, and 4-20 mA current loops used in field instrumentation. The internal 4.096V reference removes one or two external components, shrinking BOM cost for high-volume handheld units, while the SPI output saves microcontroller GPIO pins that are often scarce in compact logger designs.
Được đề xuất
Battery-Powered Instrumentation
The MAX189BC/D is well matched to battery-powered digital multimeters, clamp meters, and isolated sensor read-out boards where the +5V rail is generated by a boost converter from a 3V cell. The part's 8.5 microsecond conversion time and 1.5 microsecond acquisition support rapid autoranging without inducing audible noise on the analog front-end. Duty-cycling via the SHDN pin lets the system sleep at 2 microamps between conversions, a critical capability for handheld instruments that must last months on a single AA cell.
Được đề xuất
Industrial Process Control Front-Ends
Process-control analog front-ends that read 4-20 mA current loops or 0-5 V sensor outputs benefit from the MAX189BC/D's integral +/- 1 LSB linearity and 75 ksps throughput, which provides enough headroom for multiplexed multi-channel scanning. The integrated 4.096V reference removes the need for an external reference and saves panel space inside DIN-rail mounted controllers. The 3-wire SPI output cleanly interfaces to industrial MCUs such as the MAXQ or ARM Cortex-M families, enabling deterministic register reads under RTOS control without parallel-bus loading.
Được đề xuất
Pen-Tablet Digitizers and Touch Sensing
The MAX189BC/D's 75 ksps sampling rate and 12-bit resolution capture stylus-tip pressure and position at human-handwriting speeds without aliasing, making it suitable for pen-tablet digitizers and consumer touch-control peripherals. The serial interface keeps the flex-cable count to three (CS, SCLK, DOUT), allowing clean routing between the sensor matrix and the host MCU. The 2-microamp shutdown mode lets the digitizer sleep between pen-down events, extending battery life in wireless tablets.
Được đề xuất
Isolated Sensor Read-Out Stages
Isolated analog front-ends using digital isolators and a single isolated +5V rail pair cleanly with the MAX189BC/D, which presents only three digital signals to the isolator (CS, SCLK, DOUT). Compared with parallel-output ADCs, the MAX189BC/D's SPI interface cuts isolator channel count - and therefore BOM cost - by an order of magnitude. The internal 4.096V reference tolerates the warm-up drift common in isolated modules, and the 1.5 mA active current keeps the isolated-side supply budget under 10 mW even at full 75 ksps throughput.
Được đề xuất
Hybrid Module and MCM Designs
Because the MAX189BC/D ships as a bare die, it integrates naturally into hybrid modules and multi-chip modules (MCMs) where space and parasitic inductance are at a premium. Designs targeting medical imaging probes, downhole oil-drilling sensors, and aerospace instrumentation place the MAX189BC/D die alongside an op-amp die and reference die in a single ceramic substrate, eliminating the bond-wire inductance of a packaged part. Designers working in this space will value the matched 4.096V reference and SPI-compatible serial output, both of which simplify cross-die interconnections on the substrate.
Được đề xuất
Handheld Test and Measurement
The MAX189BC/D's combination of 12-bit resolution, 75 ksps sampling, and 1.5 mA active current suits handheld oscilloscope-style probes and signal-conditioner modules where low weight and long battery life are mandatory. The integrated track/hold and 4.096V reference simplify the analog signal chain to a resistor-divider, op-amp buffer, and the ADC itself, which keeps the front-end BOM under a dozen components. Designers targeting portable test instruments can use the SPI interface to stream captured samples to an OLED display and on-board memory without taxing the host microcontroller.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX189BC/D — 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 | MAX189CC/D | MAX189AC/D | MAX187BC/D | MAX187BCPA |
|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | Die (bare die) | Die (bare die) - same | Die (bare die) - same | Die (bare die) - same | 8-pin PDIP - same family, packaged |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 75 ksps | 75 ksps | 75 ksps | 75 ksps | 75 ksps |
| Integral Nonlinearity | +/- 1 LSB (B grade) | +/- 1 LSB (C grade) | +/- 1/2 LSB (A grade) | +/- 1 LSB | +/- 1 LSB |
| Output Interface | Serial (SPI) | Serial (SPI) | Serial (SPI) | Parallel (12-bit) | Parallel (12-bit) |
| Internal Reference | 4.096 V buffered | 4.096 V buffered | 4.096 V buffered | 4.096 V buffered | 4.096 V buffered |
| Supply Voltage | +5 V | +5 V | +5 V | +5 V | +5 V |
Bảo phân biệt quan trọng
- Bare-die format enables hybrid and MCM integration (vsMAX187BCPA)
- Lower-cost +/-1 LSB INL versus A-grade precision (vsMAX189AC/D)
- SPI serial output minimizes isolator channel count (vsMAX187BC/D)
Ghi chú thiết kế
Decouple VDD with a 0.1 uF ceramic capacitor placed within 2 mm of the die bond pad, and add a 10 uF bulk capacitor at the supply entry to the MCM or hybrid substrate. The MAX189BC/D draws 1.5 mA active and 2 uA in shutdown, so the bulk capacitor value is set by the worst-case burst-conversion current rather than the average. Estimated: at 75 ksps with 8.5 us per conversion, the maximum RMS ripple on the supply stays under 5 mV if the bulk capacitor is mounted within 5 mm of the VDD pad.
Separate the analog ground (AGND) and digital ground (DGND) on the substrate and tie them together at a single point near the GND bond pad. Keep digital traces (CS, SCLK, DOUT) routed away from the AIN and REF pads to avoid capacitive coupling that appears as input-sampling kickback. For die-level assembly, minimize bond-wire length on the AIN node to keep track/hold acquisition accurate at 1.5 us.
Do not drive SHDN faster than the data-sheet maximum slew rate, otherwise the internal bias recovery may corrupt the first conversion. Always issue a dummy conversion after wake-up from shutdown before reading a meaningful sample. The internal reference requires the REF cap pin to be bypassed with at least 4.7 uF; reducing this capacitor degrades reference stability and ADC linearity.
When using long PCB or flex-cable runs, place a 100 ohm series resistor at the SCLK and DOUT drivers near the source to dampen transmission-line ringing. The MAX189BC/D's SPI inputs are not 5V tolerant if the controller runs at 3.3 V, so confirm the Vih threshold against the controller's VOH. Estimated: with a 100 ohm series resistor and 10 pF load, the SCLK edge rate stays below 5 ns/V into the ADC pin.
Thông tin tuân thủ
RoHS and lead-free per Maxim product page. Not AEC-Q100 qualified - the MAX189 is commercial temperature grade. Bare-die parts are typically not halogen-free tested in the same way as packaged parts; consult factory for specific requirements.
