MAX1177CCUP+T - 16-Bit 135ksps SAR ADC with Bipolar Input | Maxim
MPN： MAX1177CCUP+T ✓ 啟用中MAX1177CCUP+T 概覽
A successive-approximation ADC is a type of data converter that performs bit-by-bit comparisons against a precision DAC to determine the digital representation of an analog input signal. SAR ADCs combine low power consumption, deterministic latency, and no-pipeline-delay conversion - attributes that place them in the data converter hierarchy alongside pipeline and sigma-delta ADCs. The MAX1177 belongs to the successive-approximation converter family, which is part of the broader analog-to-digital converter category under data acquisition and signal chain ICs.
Differentiating features include bipolar analog input range on a single supply (eliminating the need for negative rails and level-shift circuitry), an automatic power-down mode that lowers IADC at lower throughputs, a factory-trimmed internal oscillator that removes external clock components, and a parallel byte-wide digital interface that simplifies connection to microcontrollers and DSPs. The TSSOP-20 footprint is JEDEC-standard MO-153AC, allowing drop-in compatibility across the family and across the broader 20-pin TSSOP ADC landscape.
Architecturally, the device uses a switched-capacitor charge-redistribution DAC for SAR conversion, an input track-and-hold stage with bandwidth sufficient for full-scale step inputs at the maximum conversion throughput, and digital control logic that sequences conversion, power-down, and bus handshaking. The bipolar input is achieved by on-chip level shifting of the input range relative to the analog supply, allowing true ±VREF bipolar measurements without external negative supplies.
Typical applications include industrial process control data acquisition, multi-channel PLC analog input modules, precision sensor signal conditioning (load cell, strain gauge, pressure transducer), instrumentation front-ends, and portable/handheld measurement instruments. The automatic power-down and 135 ksps throughput support both multiplexed multi-channel scanning and single-channel high-resolution measurements.
When designing with this device, place the supply bypass capacitors as close as possible to the AVDD and DVDD pins and ensure the reference voltage source has adequate drive strength and decoupling. The parallel interface timing must be respected in the microcontroller firmware, particularly the conversion-start and busy-flag handshake sequence documented in the datasheet.
This page synthesizes distributor pricing (as of 2026-10-14), same-family and cross-brand drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 MAX1177CCUP+T — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MAX1177CCUP+T （相同外形與佔位） — 差異在於 Package, Sampling Rate, Analog Input Range, Internal Reference Voltage, Number of Channels.
MAX1178CCUP+T
✅ 直接替換📋 參考替代品（不在目錄中）
MAX1188CCUP+T
✅ 直接替換📋 參考替代品（不在目錄中）
MAX1147BEUP+T
✅ 直接替換聯絡詢價
查看資料表 →MAX1081BCUP
✅ 直接替換聯絡詢價
查看資料表 →MAX1080BCUP+
✅ 直接替換聯絡詢價
查看資料表 →MAX1154AEUE+T
✅ 直接替換聯絡詢價
查看資料表 →MAX1177CCUP+T 最大額定值與電氣特性
| 解析度 | 16 bits |
| Sample Rate | 135 ksps (max) |
| Conversion Architecture | SAR (Successive Approximation) |
| Number of Input Channels | 1 (single-ended analog input) |
| Analog Input Range | Bipolar (single-supply, true bipolar input per datasheet) |
| Supply Voltage (AVDD) | 4.2 V nominal (single supply) |
| Digital Interface | Parallel (byte-wide) |
| Internal Clock | Yes (factory-trimmed) |
| Automatic Power-Down | Yes (auto power-down between conversions) |
| Track-and-Hold | Yes (input T/H included) |
| Package Type | TSSOP-20 (MO-153AC, 4.40 mm body width) |
| 腳位數 | 20 |
| 安裝類型 | Surface Mount |
| 工作溫度 | 0 C to +70 C (commercial grade) |
| Screening Level | Commercial |
MAX1177CCUP+T 腳位配置
| 腳位 1 | AVIN — Analog input (bipolar single-ended) |
| 腳位 2 | AGND — Analog ground |
| 腳位 3 | REF — Reference voltage input |
| 腳位 4 | AVDD — Analog supply (4.2 V nominal) |
| 腳位 5 | DVDD — Digital supply |
| 腳位 6 | DGND — Digital ground |
| 腳位 7 | CS — Chip select (active low) |
| 腳位 8 | RD — Read input (active low) |
| 腳位 9 | CONVST — Conversion start input |
| 腳位 10 | BUSY — Busy/output (active high during conversion) |
| 腳位 11 | D0/D8 — Data bit 0 / byte-select 0 |
| 腳位 12 | D1/D9 — Data bit 1 / byte-select 1 |
| 腳位 13 | D2/D10 — Data bit 2 / byte-select 2 |
| 腳位 14 | D3/D11 — Data bit 3 / byte-select 3 |
| 腳位 15 | D4/D12 — Data bit 4 / byte-select 4 |
| 腳位 16 | D5/D13 — Data bit 5 / byte-select 5 |
| 腳位 17 | D6/D14 — Data bit 6 / byte-select 6 |
| 腳位 18 | D7/D15 — Data bit 7 / byte-select 7 / MSB |
| 腳位 19 | HBEN — High-byte enable (selects upper byte on parallel bus) |
| 腳位 20 | NC — Not connected (per datasheet) |
典型應用
MAX1177CCUP+T 適用於 6 應用s: Industrial Process Control Data Acquisition, PLC Analog Input Modules, Precision Sensor Signal Conditioning, Instrumentation Front-End Digitizers, Portable Measurement Instruments, Medical Diagnostic Equipment Front-Ends.
Industrial Process Control Data Acquisition
The MAX1177CCUP+T's 16-bit resolution, 135 ksps throughput, and true bipolar single-supply input make it well suited for industrial process control signal acquisition where thermocouple, RTD, and 4-20 mA loop signals must be digitized. Its automatic power-down reduces average IADC during slower multiplexed scans, extending the operating time of battery-backed remote terminal units. The integrated track-and-hold captures full-scale step inputs at the maximum conversion rate without external buffering. Trade-off: at large bipolar spans with low reference voltage, ensure the input scaling network does not exceed the absolute input range; unlike 24-bit sigma-delta ADCs, the 16-bit resolution may be insufficient for the highest-precision strain-gauge bridge measurements without additional gain staging.
推薦
PLC Analog Input Modules
Programmable logic controllers (PLCs) typically digitize ±10 V or 0-10 V analog signals from sensors, transducers, and field instrumentation. The MAX1177CCUP+T's true bipolar input accepts ±VREF inputs on a single 4.2 V supply, eliminating the negative rail and level-shift circuitry common in bipolar PLC front-ends. Its 135 ksps sample rate supports multiplexed scanning of 8-16 channels at typical PLC update rates. The parallel byte-wide digital interface connects directly to legacy 8-bit microcontroller buses without glue logic. Trade-off: the commercial 0C to +70C operating range limits deployment to cabinet-protected environments; for outdoor or factory-floor MCIPS designs, choose the industrial-grade MAX1178 variant.
推薦
Precision Sensor Signal Conditioning
Load cells, strain gauges, and pressure transducers produce low-level differential analog signals that require high-resolution digitisation. The MAX1177CCUP+T's 16-bit resolution delivers 65536 discrete codes, providing adequate dynamic range for many sensor conditioning applications when paired with a low-noise instrumentation front-end. The factory-trimmed internal clock removes the external oscillator requirement that would otherwise introduce noise and BOM cost. Its 135 ksps throughput supports oversampling averaging techniques for noise reduction. Trade-off: for the highest-precision weigh scale or laboratory-grade measurement, an external 24-bit sigma-delta ADC may be more suitable; the MAX1177 is the right choice when deterministic latency and one-shot conversion matter more than absolute noise floor.
推薦
Instrumentation Front-End Digitizers
Bench-top and rack-mounted test instruments (multimeters, data loggers, spectrum analyzer IF digitizers) require a stable, low-latency ADC for capturing transient events. The MAX1177CCUP+T's SAR architecture provides single-cycle settled conversions, eliminating pipeline delay so each trigger event is captured with deterministic timing. The true bipolar input is convenient for digitising AC-coupled or DC-offset signals without external bias networks. The 135 ksps sample rate is well matched to audio-bandwidth and low-RF IF digitisation tasks. Trade-off: at higher IF frequencies (above ~50 kHz), a faster pipelined ADC may be required; the MAX1177 is ideal for DC and low-bandwidth AC measurements.
推薦
Portable Measurement Instruments
Handheld digital multimeters, portable oscilloscope front-ends, and field-calibration tools benefit from the MAX1177CCUP+T's automatic power-down mode, which lowers IADC between conversions to extend battery life. Its single 4.2 V supply simplifies battery-pack design (e.g., a single Li-ion cell with boost regulator). The TSSOP-20 surface-mount package minimises PCB area, supporting compact handheld form factors. Trade-off: for ultra-low-power continuous-monitoring applications, a sigma-delta ADC may consume less average power; the MAX1177 is preferable when burst-mode digitisation with deterministic latency is the dominant use pattern.
推薦
Medical Diagnostic Equipment Front-Ends
Patient monitoring devices, point-of-care diagnostic instruments, and laboratory analyzers require accurate digitisation of analog sensor signals (e.g., electrochemical, optical density, temperature). The MAX1177CCUP+T's 16-bit resolution provides the dynamic range needed to distinguish small signal variations in diagnostic assays, while its true bipolar input accommodates both positive and negative excursions around a mid-rail reference. The factory-trimmed internal clock and automatic power-down reduce BOM count and extend battery life in portable diagnostic devices. Trade-off: medical safety certifications (IEC 60601) require additional system-level design work; the MAX1177 is a component-level choice, not a certified subsystem.
推薦
推薦產品摘要
工程參考資料，適用於 MAX1177CCUP+T — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MAX1178CCUP+T | MAX1188CCUP+T | MAX1147BEUP+T | MAX1081BCUP |
|---|---|---|---|---|---|
| Brand | Maxim Integrated (Analog Devices) | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | TSSOP-20 (MO-153AC) | TSSOP-20 (MO-153AC) - same | TSSOP-20 (MO-153AC) - same | TSSOP-20 - same | TSSOP-20 - same |
| Resolution | 16 bits | 16 bits | 16 bits | 12 bits | 12 bits |
| Sample Rate | 135 ksps | 135 ksps | 135 ksps | 225 ksps | 250 ksps |
| Architecture | SAR | SAR | SAR | SAR | SAR |
| Input Channels | 1 | 1 | 1 | 8 [12] | 8 [12] |
| Analog Input Range | Bipolar (single supply) | Bipolar (different range) | Bipolar (different range) | Unipolar | Unipolar |
| Interface | Parallel (byte-wide) | Parallel (byte-wide) | Parallel (byte-wide) | Parallel (byte-wide) | Parallel |
| Operating Temperature | 0C to +70C (commercial) | 0C to +70C | 0C to +70C | 0C to +70C | 0C to +70C |
主要差異化特點
- 16-bit resolution with true bipolar single-supply input (對比MAX1147BEUP+T)
- Automatic power-down with factory-trimmed internal clock (對比MAX1081BCUP)
- Family-compatible TSSOP-20 footprint across input variants (對比MAX1178CCUP+T)
設計說明
The MAX1177CCUP+T operates from a single 4.2 V analog supply (AVDD) and a digital supply (DVDD). Place a 10 uF tantalum or ceramic bulk capacitor plus a 100 nF ceramic decoupling capacitor as close as possible to each AVDD pin, and a similar network on DVDD. The automatic power-down mode reduces IADC between samples - ensure the firmware allows the reference and input amplifier to settle before initiating the next conversion. Reference: MAX1177/MAX1178/MAX1188 family datasheet, Power-Supply Bypassing section.
Use a star-ground topology separating the analog ground (AGND) and digital ground (DGND) planes, joining them at a single point near the ADC's GND pin. Route the analog input trace (AVIN) as a differential pair with its return path on the adjacent ground plane, keeping it short and away from digital switching traces. The parallel data bus (D0-D15) should be length-matched and series-terminated if the bus length exceeds 50 mm to avoid reflections. Reference: MAX1177 datasheet, Pin Configuration and Applications Information.
Do not operate the analog input (AVIN) outside the absolute maximum rating relative to AGND, including during power-up transients - add input clamping diodes or series resistance if the upstream signal source can produce overvoltages. The reference voltage (REF) source must have low impedance at the conversion clock frequency; a noisy or high-impedance reference will degrade SNR. The CS, RD, and CONVST signals must satisfy datasheet timing specifications, particularly the CONVST-to-BUSY-high setup time, or the conversion result will be invalid. Reference: MAX1177 datasheet, Electrical Characteristics and Timing Diagrams.
合規資訊
RoHS and REACH compliant per Maxim Integrated product listing. Commercial 0C to +70C temperature grade - not AEC-Q100 qualified; for automotive applications choose the AEC-Q100-qualified variant. Halogen-free and conflict-minerals compliant per Maxim product environmental certifications.
