MAX1078CTC+ - 10-Bit 1.8MSPS Differential ADC | Maxim Integrated
部品番号: MAX1078CTC+ ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $5.32 | $5.32 |
| 10 | $4.78 | $47.80 |
| 100 | $4.25 | $425.00 |
| 500 | $3.82 | $1,910.00 |
| 1,000 | $3.4 | $3,400.00 |
MAX1078CTC+ 概要
An ADC (Analog-to-Digital Converter) is a data-conversion integrated circuit that samples a continuous analog input voltage and produces a discrete digital code representing its magnitude, using successive-approximation or pipeline architectures. The MAX1078 specifically uses a successive-approximation register (SAR) topology, which provides deterministic latency (single conversion cycle) and inherently low power consumption at moderate sample rates - making it well suited to multiplexing between multiple sensor channels in industrial and instrumentation systems.
Key differentiating features include a true-differential analog input (rejecting common-mode noise that single-ended ADCs cannot), an internal 2.5V reference (eliminating external reference components and saving board area), a high-speed SPI/QSPI/MICROWIRE-compatible serial interface, and a low 1.8MSPS throughput that oversamples audio and vibration bands. The device operates from a single +2.7V to +3.6V analog supply and a +1.8V to +3.6V digital supply, simplifying power-tree design in 3.3V systems.
The MAX1078 employs a switched-capacitor input stage optimized for signals from DC to several hundred kHz, with input bandwidth exceeding 4MHz. Its successive-approximation architecture, charge-redistribution DAC, and on-chip clock generate conversions with no pipeline delay, allowing direct use in closed-loop control or multiplexed data-acquisition front-ends.
Typical applications include data-acquisition systems, portable instrumentation, pen-digitizers and tablets, loop-powered industrial transmitters, and vibration / audio monitoring. The wide input common-mode range and integrated reference make the device especially attractive for sensors with ground-referred or remotely-grounded outputs.
When designing with the MAX1078, place the 0.1uF and 10uF decoupling capacitors as close as possible to the AVDD/DVDD pins and route the digital SPI lines with reference to a solid ground plane, ideally with series termination to suppress reflections. For best dynamic performance, drive the true-differential inputs (IN+ and IN-) symmetrically and keep input traces length-matched.
This page synthesizes distributor pricing, drop-in alternatives, and PCB-level design notes not found in the manufacturer datasheet, enabling faster part selection and schematic entry.
ドロップイン代替品: MAX1078CTC+ — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: MAX1078CTC+ （同一形状・フットプリント） — 相違点: Number of Channels, Package, Internal Reference, Resolution, Input Type.
クイック比較ツール — 並列比較する代替部品を選択:
MAX1076CTC+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1070CTC+
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$5.18 / 個
データシートを見る →MAX1071CTC+T
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$4.31 / 個
データシートを見る →MAX1033EUP+
✅ ドロップイン✓ 在庫あり
$9.2 / 個
データシートを見る →MAX1078CTC+ 最大定格＆電気的特性
| 分解能 | 10 bits |
| Sample Rate | 1.8 MSPS |
| Number of Channels | 1 (true-differential) |
| Input Type | True Differential (IN+ / IN-) |
| Architecture | SAR (Successive Approximation Register) |
| Analog Supply Voltage (AVDD) | 2.7 V to 3.6 V |
| Digital Supply Voltage (DVDD) | 1.8 V to 3.6 V |
| Analog Input Bandwidth | 4 MHz (typ) |
| Internal Reference | 2.5 V (integrated) |
| Data Interface | SPI / QSPI / MICROWIRE-compatible serial |
| 動作温度 | -40 C to +85 C |
| パッケージ | 12-TQFN (4x4 mm) |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant |
MAX1078CTC+ ピン構成
| ピン 1 | AVDD — Analog supply voltage (2.7V to 3.6V) |
| ピン 2 | IN+ — Positive differential analog input |
| ピン 3 | IN- — Negative differential analog input |
| ピン 4 | REF — Reference voltage input/output (internal 2.5V) |
| ピン 5 | GND — Analog ground |
| ピン 6 | DGND — Digital ground |
| ピン 7 | DVDD — Digital supply voltage (1.8V to 3.6V) |
| ピン 8 | CS — Chip select (active low) |
| ピン 9 | SCLK — Serial clock input |
| ピン 10 | DOUT — Serial data output |
| ピン 11 | NC — Not connected (per datasheet) |
| ピン 12 | EP — Exposed pad - tie to analog ground |
主な用途
MAX1078CTC+ の用途: 6 件s: Industrial Data-Acquisition Systems, Pen-Digitizers and Tablet Inputs, Loop-Powered Industrial Transmitters, Portable Instrumentation, Audio and Vibration Monitoring, Medical Patient Monitoring Devices.
Industrial Data-Acquisition Systems
The MAX1078CTC+ suits multi-channel industrial data-acquisition front-ends built around a single true-differential sampling converter per board. Its 1.8MSPS throughput oversamples sensor signals up to several hundred kHz with deterministic SAR latency, while the integrated 2.5V reference removes external reference components and trims the BOM. Split AVDD/DVDD supplies let the analog section run on 3.3V and the digital outputs interface directly with a 1.8V MCU. Placed between the sensor signal chain and an SPI master, the converter delivers 10-bit codes suitable for vibration, pressure, and strain-gauge front-ends.
おすすめ
Pen-Digitizers and Tablet Inputs
Pen-digitizer electronics require a fast, low-power ADC paired with a small true-differential input stage to capture stylus position signals cleanly. The MAX1078CTC+ delivers 1.8MSPS over SPI, supporting several thousand samples per second per axis while preserving small-amplitude pen-tip signals; the integrated reference cuts board area, which is critical inside a slim stylus tablet chassis. Using the same ADC across X, Y, and pressure axes ensures uniform quantization and simpler calibration. The 12-TQFN (4x4 mm) footprint fits neatly under the digitizer's rigid flex tail.
おすすめ
Loop-Powered Industrial Transmitters
Loop-powered 4-20 mA / HART transmitters demand a low-power ADC with true-differential input capability to reject ground-loop noise between the field sensor and the controller. The MAX1078CTC+ provides 10-bit resolution at 1.8MSPS, more than sufficient for slow process variables, while its integrated 2.5V reference eliminates a separate reference IC and its quiescent current drain. Differential input (IN+, IN-) lets the front-end connect directly to bridge-style pressure, flow, or temperature sensors. Split AVDD/DVDD rails further reduce total loop current draw.
おすすめ
Portable Instrumentation
Hand-held multimeters, oscilloscope probes, and portable data loggers need a small-footprint ADC with low power dissipation and an on-chip reference. The MAX1078CTC+ in a 12-TQFN (4x4 mm) with integrated 2.5V reference keeps the analog section compact and predictable across temperature, which matters in battery-powered instruments with no precision external reference. 1.8MSPS throughput supports periodic snapshot acquisition of fast transients before sleeping the converter. The SPI-compatible serial output lets a low-power MCU poll the part directly.
おすすめ
Audio and Vibration Monitoring
Audio-band acquisition systems for vibration and acoustic emission monitoring benefit from 1.8MSPS SAR sampling, which oversamples audio by ~40x and lets an FPGA or DSP decimate to clean 16-bit equivalent data. The MAX1078CTC+ true-differential input is critical here because sensor ground loops are common in industrial environments and the differential input rejects common-mode pickup on long cable runs. The internal reference eliminates a noise-sensitive external reference path on the analog front-end. The 12-TQFN package keeps the analog section dense near the sensor preamp.
おすすめ
Medical Patient Monitoring Devices
Patient-monitoring equipment such as bedside telemetry, ECG Holter recorders, and ambulatory vital-sign patches require low-power, small-footprint ADCs with deterministic latency. The MAX1078CTC+ at 12-TQFN (4x4 mm) with integrated reference fits on the densest medical-grade PCBs while the SPI interface talks directly to low-power microcontrollers running bio-signal processing. True-differential inputs reject 50/60 Hz mains pickup common in clinical environments. Low quiescent current extends battery runtime in wearable patient monitors.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: MAX1078CTC+ — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | MAX1076CTC+ | MAX1070CTC+ | MAX1071CTC+T | MAX1033EUP+ |
|---|---|---|---|---|---|
| Package | 12-TQFN (4x4 mm) | 12-TQFN (4x4) - same | 12-TQFN (4x4) - same | 12-TQFN (4x4) - same | 12-TQFN (4x4) - same family footprint |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 10 bits | 10 bits | 10 bits | 10 bits | 12 bits |
| Sample Rate | 1.8 MSPS | Lower power variant, reduced sample rate | Comparable (family) | Comparable (family) | Multi-channel SAR family |
| Input Channels | 1 true-differential | 1 true-differential | 1 single-ended (family) | 1 true-differential | Up to 4 channels (multiplexed) |
| Internal Reference | 2.5 V integrated | 2.5 V integrated | 2.5 V integrated | 2.5 V integrated | External reference (typical for family) |
| Analog Supply (AVDD) | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 5.25 V (wider) |
| Digital Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE |
主な差別化要因
- True-differential input in a 12-TQFN SAR ADC （vs MAX1033EUP+)
- Integrated 2.5V reference eliminates external ref （vs MAX1033EUP+)
- Split AVDD/DVDD supplies for mixed-voltage systems （vs MAX1076CTC+)
- 1.8MSPS at full 10-bit resolution （vs MAX1070CTC+)
設計ノート
Provide separate 0.1uF + 10uF ceramic decoupling on AVDD and DVDD within 5mm of the respective pins. The split analog/digital supplies reduce digital-noise coupling into the analog front-end; if the system can only afford a single 3.3V rail, place a ferrite bead in series with DVDD. Estimated: powering both rails from the same 3.3V LDO without filtering can degrade SNR by 2-3 dB versus split supplies.
Route SPI traces (SCLK, DOUT, CS) over a continuous ground plane and keep them short to the master MCU. Use length-matched differential traces from the sensor preamp to IN+ and IN- to maximize common-mode rejection; target trace impedance of 50 ohm single-ended for the SPI bus. Place the exposed pad (EP) on a continuous copper pour tied to analog ground for thermal dissipation.
Drive the true-differential inputs (IN+ and IN-) symmetrically from a low-impedance driver; do not single-end drive IN- with a passive resistor network. If the sensor ground is remote, bias the inputs around AVDD/2 to keep both signals inside the linear input range. For best THD, use a wide-bandwidth op-amp such as the MAX4106 or AD8021 in front of the converter.
Do not exceed 3.6V on AVDD or 3.6V on DVDD - doing so will permanently damage the device. Avoid driving DOUT into a long cable without a series terminator; the SPI bus should remain on the local PCB. Estimated: without 33 ohm series termination, reflections on SCLK edges >50 MHz can cause double-clocking of the data converter.
コンプライアンス情報
RoHS compliant per Maxim Integrated product page (now under Analog Devices). REACH compliance status consistent with RoHS, no SVHC declared above threshold per latest manufacturer disclosure. Not AEC-Q100 qualified - this part targets industrial/commercial temperature grade -40 C to +85 C.
