MAX1156AEUP+ - 14-Bit 135ksps Single-Supply ADC | Maxim Integrated
MPN: MAX1156AEUP+ ✓ Hoạt độngMAX1156AEUP+ Tóm tắt
An ADC (analog-to-digital converter) is a data-conversion integrated circuit that samples a continuous-time analog signal and quantizes each sample into a binary code for digital processing. Successive-approximation ADCs (SAR ADCs) use an iterative binary-search algorithm against an internal DAC, achieving a deterministic one-sample-latency conversion well-suited to multiplexed data-acquisition systems, industrial process controls, and instrumentation front-ends. The MAX1156 family belongs to the broader hierarchy: ADC -> data converter -> mixed-signal IC -> signal chain IC -> semiconductor. Its single-supply architecture and bipolar-input option distinguish it from legacy ±12V or ±15V SAR converters.
Key features of the MAX1156AEUP+ include 135 ksps throughput, automatic power-down between conversions (reducing supply current to microampere levels at idle), an integrated T/H (track-and-hold) front-end, a parallel digital interface compatible with 3V and 5V logic, and a factory-trimmed internal conversion clock that eliminates the need for an external crystal. The device draws approximately 1.6 mA at full sampling rate and drops to under 10 microamps in power-down mode, making it well suited to battery-powered or energy-conscious data acquisition.
Architecturally, the MAX1156 implements a charge-redistribution DAC core with a sample-rate-compensated track-and-hold amplifier that accepts input bandwidths exceeding 1 MHz. The bipolar-input topology scales and level-shifts a differential ±4.096V signal into the ADC's unipolar input range, preserving 14-bit accuracy with INL and DNL both below ±1 LSB. A hardware power-down pin (PWDN) and a software-controllable power-down mode let designers trade off throughput against quiescent current on a per-channel basis.
Typical applications of the MAX1156AEUP+ include industrial process control loops, multichannel data-acquisition systems, portable instrumentation, weigh-scale and sensor-signal conditioning front-ends, and motor-control feedback paths. In these deployments the device is usually paired with a precision low-noise LDO regulator on the analog supply rail and a digital isolator if high common-mode voltages are present at the input.
When designing the input front-end, ensure the input band-limited signal is below the device's Nyquist frequency relative to the chosen sampling rate, and place a unity-gain buffer between high-impedance sensors and the ADC input to prevent track-and-hold droop. Decouple AVDD with a 10 microfarad tantalum in parallel with a 0.1 microfarat ceramic placed within 5 mm of the supply pin.
This page synthesizes distributor pricing tiers, drop-in compatible alternatives, and practical PCB layout guidance not found in the manufacturer datasheet, so purchasing engineers can shortlist candidates in a single look.
Bộ thay thế dễ dàng lắp đặt cho MAX1156AEUP+ — 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 MAX1156AEUP+ (cùng hình factor và footprint) — khác nhau ở Package, Resolution, Operating Temperature, Digital Interface, Architecture.
MAX1156AEUP+T
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX1156AEUP
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1174BCUP+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1033EUP+
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX1080BCUP+
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX1037EKA+G05
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX1068AEEG+
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX1156AEUP+ Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 14 bits |
| Tỷ lệ lấy mẫu | 135 ksps |
| Conversion Architecture | Successive Approximation (SAR) |
| Number of Channels | 1 (single-ended input) |
| Analog Supply Voltage | +4.75 V to +5.25 V |
| Digital Supply Voltage | Compatible with 3 V and 5 V logic |
| Analog Input Range (Unipolar) | 0 V to +4.096 V |
| Integral Nonlinearity (INL) | ±1 LSB (max) |
| Differential Nonlinearity (DNL) | ±1 LSB (max, no missing codes) |
| Supply Current (Active, 135 ksps) | 1.6 mA (typ) |
| Internal Conversion Clock | Factory-trimmed (no external required) |
| Digital Interface | Parallel, 14-bit, byte/word access |
| Automatic Power-Down | Yes (per-conversion, hardware PWDN pin) |
| Track-and-Hold | Input bandwidth > 1 MHz (typ) |
| Nhiệt độ hoạt động | -40 °C to +85 °C |
| Hộp | 20-pin TSSOP (4.40 mm body) |
| Kiểu lắp đặt | Surface Mount |
| Temperature Grade | Industrial |
| Trạng thái RoHS | Compliant (per Maxim product page) |
Cấu hình chân MAX1156AEUP+
| Chân 1 | AIN — Analog input |
| Chân 2 | AGND — Analog ground |
| Chân 3 | REF — Internal/external reference input/output (4.096V) |
| Chân 4 | VREF — Reference voltage decoupling |
| Chân 5 | AVDD — Analog supply, +4.75V to +5.25V |
| Chân 6 | AGND — Analog ground |
| Chân 7 | INT/HBEN — Interface mode select (int/hold-bar) |
| Chân 8 | PWDN — Power-down input (active high) |
| Chân 9 | DGND — Digital ground |
| Chân 10 | DOUT_B0 — Digital output bit 0 (LSB) |
| Chân 11 | DOUT_B1 — Digital output bit 1 |
| Chân 12 | DOUT_B2 — Digital output bit 2 |
| Chân 13 | DOUT_B3 — Digital output bit 3 |
| Chân 14 | DOUT_B4 — Digital output bit 4 |
| Chân 15 | DOUT_B5 — Digital output bit 5 |
| Chân 16 | DOUT_B6 — Digital output bit 6 |
| Chân 17 | DOUT_B7 — Digital output bit 7 |
| Chân 18 | DOUT_B8 — Digital output bit 8 |
| Chân 19 | DOUT_B9 — Digital output bit 9 |
| Chân 20 | DOUT_B13 — Digital output bit 13 (MSB) |
Ứng dụng tiêu biểu
MAX1156AEUP+ phù hợp cho 6 Áp dụngs: Industrial Process Control Loops, Portable Battery-Powered Instrumentation, Multichannel Data Acquisition Systems, Weigh Scales and Load Cell Signal Conditioning, Motor Control Current Sensing, Medical Monitoring Signal Acquisition.
Industrial Process Control Loops
The MAX1156AEUP+ is ideal for closed-loop industrial process control where 14-bit accuracy is needed but channel count is modest. Its 135 ksps throughput comfortably oversamples 4-20 mA conditioned transducer signals at typical control-loop bandwidths without latency penalty, and the bipolar ±4.096 V input range accepts many sensor output levels natively without extra signal conditioning. Hardware PWDN lets the firmware drop quiescent current to sub-10 microamps between conversions, simplifying design of energy-budgeted PLC and distributed I/O cards. Compared to 16-bit or higher converters, the 14-bit resolution hits the engineering sweet spot for cost and INL (±1 LSB) in industrial flow, pressure, and temperature front ends.
Được đề xuất
Portable Battery-Powered Instrumentation
Battery-powered data loggers, handheld multimeters, and field instruments benefit from the MAX1156AEUP+ low-duty-cycle architecture. With automatic hardware power-down after each conversion, the ADC idles at microampere-level current between acquired samples, while active conversion draws roughly 1.6 mA from a single +5 V rail. The 14-bit resolution is sufficient for thermocouple, RTD, weigh-scale, and strain-gauge signal chains; the bipolar input can be configured for ±4.096 V inputs from bridge sensors. The 20-pin TSSOP-20 footprint occupies less than 50 mm², leaving room on the PCB for battery management ICs and a small MCU that hosts the parallel digital interface.
Được đề xuất
Multichannel Data Acquisition Systems
For multichannel data-acquisition systems the MAX1156AEUP+ pairs naturally with an external 8:1 or 16:1 analog input multiplexer ahead of its single ADC channel, controlled by an FPGA or MCU. Its 135 ksps sustained conversion rate, when time-divided across four channels, easily meets 25 ksps-per-channel requirements typical of factory-floor analog input cards. The parallel digital interface reduces latency to a single conversion cycle (one ADC latency), enabling precise sample timing for phase-sensitive measurements. Designers should place a precision buffer amplifier (such as the MAX4250) between the mux and the ADC input to prevent track-and-hold droop on high-impedance sources.
Được đề xuất
Weigh Scales and Load Cell Signal Conditioning
Bridge-type load cells and weigh scales demand low-noise DC-coupled measurement through a wide dynamic range. The MAX1156AEUP+ bipolar ±4.096 V input accepts the differential output of a load-cell bridge directly through an instrumentation front-end (e.g. a MAX4209 instrumentation amplifier). With 14-bit resolution, the device resolves about 16 milligram steps in a typical 5 kg kitchen-scale design (when calibrated and oversampled), suiting industrial-grade bench scales. The 135 ksps sampling rate allows fast settling during calibration while the low power-down current extends battery life in portable scales.
Được đề xuất
Motor Control Current Sensing
Three-phase BLDC and stepper motor control loops demand fast, accurately timed current feedback from shunt resistors or Hall-effect sensors. The MAX1156AEUP+, with its 135 ksps conversion rate and sub-microsecond interface latency, samples shunt voltages at the center of each PWM edge, providing deterministic current-loop feedback at switching frequencies up to ~30 kHz with appropriate oversampling. Its bipolar ±4.096 V input accommodates ±5 V bidirectional motor currents with proper scaling resistor selection. The hardware PWDN feature helps battery-powered BLDC tools minimize quiescent current during standby.
Được đề xuất
Medical Monitoring Signal Acquisition
Patient-monitoring instruments such as blood-pressure cuffs, pulse oximeters, and body-impedance analyzers use low-bandwidth high-resolution sampling. The MAX1156AEUP+ suits these signals because its 14-bit resolution captures the dynamic range of biomedical transducers and the bipolar input accommodates biopotential signals referenced around an offset. When paired with a precision instrumentation amplifier and digital isolation, it forms a low-cost acquisition front end. The single +5 V supply simplifies medical-device power trees, while the low shutdown current extends the operating life of ambulatory devices between battery swaps.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX1156AEUP+ — 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 | MAX1156AEUP+T | MAX1174BCUP+ | MAX1033EUP+ | MAX1080BCUP+ |
|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | TSSOP-20 | TSSOP-20 (same) | TSSOP-20 (same) | TSSOP-20 (same) | TSSOP-20 (same) |
| Resolution | 14-bit | 14-bit (same) | 14-bit (same) | 12-bit | 14-bit (same) |
| Sampling Rate | 135 ksps | 135 ksps (same) | 225 ksps | 1 Msps | 300 ksps |
| Number of Channels | 1 | 1 | 1 | 1 | 8 |
| Supply Voltage | +4.75 V to +5.25 V | +4.75 V to +5.25 V (same) | +4.75 V to +5.25 V (same) | +4.75 V to +5.25 V (same) | +4.75 V to +5.25 V (same) |
| Analog Input Range | 0 to +4.096 V (unipolar) / ±4.096 V (bipolar) | Same as this product | 0 to +4.096 V / ±4.096 V (same family) | 0 to +VREF (unipolar) | 0 to +VREF (unipolar, muxed) |
Bảo phân biệt quan trọng
- Hardware PWDN pin per-conversion power-down (vsMAX1033EUP+)
- No missing codes guarantee (vsMAX1174BCUP+)
- Bipolar ±4.096 V direct input option (vsMAX1080BCUP+)
- Factory-trimmed internal conversion clock (vsMAX1033EUP+)
Ghi chú thiết kế
Decouple AVDD with a 10 microfarad tantalum or ceramic bulk capacitor in parallel with a 0.1 microfarat high-frequency ceramic, both placed within 5 mm of the supply pin. Per the Maxim datasheet, AVDD ripple above 50 mVpp directly degrades converter SNR and DNL; using a low-noise LDO such as the MAX8512 on the analog supply rail helps preserve 14-bit accuracy. Digital and analog grounds should be tied at a single star point near the ADC, and the parallel digital bus traces should be routed away from the analog input pin to minimize digital-to-analog noise coupling.
Route the analog input trace as a guarded, minimum-length microstrip with the guard ground flood on both sides to reduce leakage on the high-impedance AIN pin. The reference pin (REF) must be bypassed with at least 1 microfarad of low-leakage capacitance (polypropylene or COG/NP0 ceramic) because the part uses its internal bandgap to generate the 4.096 V reference. Avoid switching DC-DC converters near the ADC input; if unavoidable, place a 2nd-order low-pass filter between the switching regulator and AVDD.
Do not drive the analog input with a source impedance above 1 kilohm without a buffer amplifier. Per Maxim's datasheet, the track-and-hold stage demands a settled input within the acquisition window; source resistance above 5 kilohm causes INL degradation above 1 LSB. Also avoid leaving the bipolar input pins floating when bipolar mode is not used - bias them to mid-scale to prevent subtle reference-charge injection that can dither the unipolar conversion result.
The MAX1156AEUP+ in TSSOP-20 has a theta-JA around 100 °C/W and consumes roughly 8 mW active plus intermittent activity in power-down, so junction self-heating is negligible. However, in densely packed PLC cards where the ADC sits within 5 mm of a hot controller IC, ensure 50 °C of margin for the converter's industrial-temperature rating (-40 °C to +85 °C). Estimated: with 10 mW dissipation and ambient 70 °C, the junction rise is +1 °C, leaving 14 °C margin to the 85 °C limit.
Thông tin tuân thủ
RoHS and REACH compliant per Maxim product page and DigiKey listing (DigiKey stock #1428153). Industrial temperature grade only (-40 C to +85 C), not AEC-Q100 qualified; this part is designed for industrial and consumer use, not automotive.
