MAX11040GUU+T - 24-Bit 4-Ch Simultaneous-Sampling Sigma-Delta ADC | Maxim Integrated
MPN： MAX11040GUU+T ✓ 啟用中MAX11040GUU+T 概覽
Sigma-delta ADCs are a class of oversampling converters that trade off converter speed for very high resolution by pushing quantization noise to high frequencies where a digital filter can remove it. The MAX11040 sits in the precision-measurement sub-segment of the data-converter hierarchy: precision ADC -> ADC -> data converter -> signal chain IC -> semiconductor. The simultaneous-sampling topology in particular addresses applications where phase or amplitude relationships between channels must be preserved, something that multichannel SAR or successive-approximation ADCs cannot do without external track-and-hold amplifiers.
Key features include 24-bit no-missing-code resolution, simultaneous sampling across all four input channels, an integrated digital filter with programmable output data rates, a low-drift internal reference, and a cascadable serial interface that supports up to 32 synchronized channels. The TSSOP-38 footprint keeps the converter in a moderately small surface-mount outline while exposing enough ground pins for the mixed-signal layout that a 24-bit sigma-delta demands.
Architecturally the device combines four switched-capacitor sigma-delta modulators with a shared digital filter block, all clocked from one external master clock. The internal clock-divider and decimation-filter chain can be programmed via the serial interface to trade conversion rate (up to a few ksps per channel) for effective resolution, which is the canonical sigma-delta trade-off curve. The result is a converter that delivers high effective number of bits (ENOB) at low input bandwidths where industrial sensors normally operate.
Typical applications include three-phase power metering, multi-cell battery monitoring, industrial process control loops, vibration and acoustic analysis arrays, and precision data-acquisition front ends. The cascadable synchronization is especially useful in polyphase energy meters where accurate phase-angle measurement between current and voltage channels is required for class-0.2 or class-0.5 revenue-grade accuracy.
When designing with this part, allocate a dedicated analog ground island and keep digital return currents away from the input traces; a 24-bit sigma-delta is only as good as its ground layout. Use the internal reference if absolute accuracy is sufficient, but bypass it with a low-ESR capacitor placed as close to the REFIN pin as the layout allows.
This page consolidates distributor pricing, pin-compatible MAX11040 family variants, and practical design notes that go beyond what is printed in the manufacturer datasheet.
直接替換替代品，適用於 MAX11040GUU+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。
MAX11040GUU+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX11040KGUU+T
✅ 直接替換📋 參考替代品（不在目錄中）
MAX11040KGUU+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX11040GUU+T 最大額定值與電氣特性
| 解析度 | 24 bits |
| Number of Input Channels | 4 |
| Sampling Topology | Simultaneous sampling (per channel) |
| ADC Architecture | Sigma-Delta |
| Number of Channels (Input) | 4 |
| 封裝 | 38-TSSOP (GUU) |
| Package Pin Count | 38 |
| Cascadable | Yes - up to 8 devices, 32 channels |
| Internal Reference | Yes (per family datasheet) |
| 工作溫度範圍 | Industrial grade (per supplier listing) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
MAX11040GUU+T 腳位配置
| 腳位 1 | AVDD — Analog supply voltage |
| 腳位 2 | GND — Analog ground |
| 腳位 3 | REFIN — Reference input |
| 腳位 4 | REFOUT — Reference output (internal reference) |
| 腳位 5 | AIN1+ — Channel 1 positive analog input |
| 腳位 6 | AIN1- — Channel 1 negative analog input |
| 腳位 7 | AIN2+ — Channel 2 positive analog input |
| 腳位 8 | AIN2- — Channel 2 negative analog input |
| 腳位 9 | AIN3+ — Channel 3 positive analog input |
| 腳位 10 | AIN3- — Channel 3 negative analog input |
| 腳位 11 | AIN4+ — Channel 4 positive analog input |
| 腳位 12 | AIN4- — Channel 4 negative analog input |
| 腳位 13 | GND — Analog ground |
| 腳位 14 | AVDD — Analog supply voltage |
| 腳位 15 | GND — Analog ground |
| 腳位 16 | OS — Offset calibration / mode select |
| 腳位 17 | CLKEN — Clock enable |
| 腳位 18 | XIN — External clock input |
| 腳位 19 | XOUT — External clock output (crystal) |
| 腳位 20 | GND — Digital ground |
| 腳位 21 | DVDD — Digital supply voltage |
| 腳位 22 | GND — Digital ground |
| 腳位 23 | CS — Chip select (active low) |
| 腳位 24 | SCLK — Serial clock input |
| 腳位 25 | DIN — Serial data input |
| 腳位 26 | DOUT — Serial data output |
| 腳位 27 | DRDY — Data ready output |
| 腳位 28 | SYNC — Cascade synchronization input |
| 腳位 29 | SYNCOUT — Cascade synchronization output |
| 腳位 30 | CLKOUT — Buffered clock output for cascaded devices |
| 腳位 31 | GND — Digital ground |
| 腳位 32 | DVDD — Digital supply voltage |
| 腳位 33 | GND — Digital ground |
| 腳位 34 | NC — Not connected (per datasheet) |
| 腳位 35 | NC — Not connected (per datasheet) |
| 腳位 36 | GND — Analog ground |
| 腳位 37 | AVDD — Analog supply voltage |
| 腳位 38 | GND — Analog ground |
典型應用
MAX11040GUU+T 適用於 7 應用s: Three-Phase Power Metering, Multi-Cell Battery Monitoring, Industrial Process Control Loops, Vibration and Acoustic Analysis, Precision Data Acquisition Front End, Medical Patient Monitoring Instrumentation, Weigh Scale and Force Measurement.
Three-Phase Power Metering
The MAX11040GUU+T's 24-bit sigma-delta resolution and simultaneous 4-channel sampling make it a standard building block for three-phase energy meters. The part samples the three phase voltages and currents (or a neutral current as the fourth channel) on the same clock edge, so phase-angle errors between channels are bounded by clock skew rather than by sequential conversion latency. According to the datasheet, cascading two MAX11040 devices synchronizes 8 channels for a 3-phase + neutral + auxiliary measurement front end. The internal reference and per-channel sinc filter simplify the analog front end, leaving the host MCU to compute real power, RMS, and power factor from the 24-bit data stream.
推薦
Multi-Cell Battery Monitoring
Battery-management systems for large lithium-ion stacks (EV, ESS, e-mobility) monitor each cell voltage with high resolution and tight timing alignment between cells. The MAX11040GUU+T samples four cell voltages simultaneously at 24 bits, which lets a BMS detect imbalance currents during high-C discharge without per-channel timing errors. The cascadable interface extends this to 32 cells by stacking eight MAX11040 devices, and the 38-pin TSSOP package keeps the analog front end compact. Place the ADC on a dedicated analog island with separate AVDD/DVDD planes and route each cell-sense line through a differential filter to maximize the converter's effective resolution.
推薦
Industrial Process Control Loops
Process-control front ends digitize thermocouple, RTD, and 4-20 mA loop signals at 16-24 bits while rejecting 50 Hz / 60 Hz mains interference. The MAX11040GUU+T's digital filter offers programmable notch frequencies that can be aligned to the local mains frequency, simplifying hardware filtering on each input. Four simultaneous inputs let a single device monitor four independent process variables (temperature, pressure, flow, level) with no inter-channel skew. Designers typically pair the ADC with a precision op-amp front end (e.g., MAX44241) and an external low-drift reference for Class A transmitter accuracy.
推薦
Vibration and Acoustic Analysis
Modal and acoustic test arrays demand synchronized, high-resolution acquisition across many channels so that frequency-domain analysis (FFT, modal shapes) is not corrupted by timing skew. The MAX11040GUU+T's simultaneous 4-channel sampling and cascadeable architecture support arrays of up to 32 microphones or accelerometers driven from a common clock. The 24-bit dynamic range captures the full crest factor of acoustic and vibration signals without front-end compression. Designers typically pair each converter channel with an IEPE-compatible preamp and anti-alias filter before the ADC input.
推薦
Precision Data Acquisition Front End
Modular data-acquisition systems (DAQ) for laboratory and production test need 4-32 channels of 24-bit data with deterministic latency between channels. The MAX11040GUU+T fits this role because simultaneous sampling eliminates the per-channel skew that corrupts transient captures, and the SPI-compatible serial interface streams data to a host FPGA or MCU without external bus arbitration. The TSSOP-38 package and industrial temperature grade suit PCI/USB chassis cards where the converter sits near the analog input connector. Use DRDY as a hardware interrupt to guarantee deterministic sample timing on the host side.
推薦
Medical Patient Monitoring Instrumentation
Patient monitors digitize ECG, EEG, SpO2, and respiration channels simultaneously at high resolution to capture waveform timing relationships. The MAX11040GUU+T delivers four channels of simultaneous 24-bit data, which lets a single device handle the four limb leads of an ECG front end with no inter-lead timing error. The cascadable architecture extends to 12-lead ECGs by synchronizing three MAX11040 devices. The TSSOP package and low-power digital interface suit battery-powered cart designs; designers should still add input-protection networks and a driven-right-leg circuit for patient safety.
推薦
Weigh Scale and Force Measurement
Load-cell and weigh-scale platforms digitize bridge outputs at 20-24 bits and need high common-mode rejection of thermo-EMFs and mains noise. The MAX11040GUU+T's sigma-delta architecture with programmable notch filters delivers the resolution and 50/60 Hz rejection needed for legal-for-trade scales, and the simultaneous-sampling topology lets a single device read four load cells (one per corner) without corner-to-corner timing error. The internal reference simplifies BOM but should be bypassed with a low-ESR capacitor for best noise performance.
推薦
推薦產品摘要
工程參考資料，適用於 MAX11040GUU+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 | MAX11040GUU+ | MAX11040KGUU+T | MAX11040KGUU+ |
|---|---|---|---|---|
| Package | 38-TSSOP (GUU) | 38-TSSOP (GUU) - same | 38-TSSOP (GUU) - same | 38-TSSOP (GUU) - same |
| Brand | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated |
| Resolution | 24 bits | 24 bits | 24 bits | 24 bits |
| Input Channels | 4 simultaneous-sampling | 4 simultaneous-sampling | 4 simultaneous-sampling | 4 simultaneous-sampling |
| Cascade Capability | Up to 8 devices (32 channels) | Up to 8 devices (32 channels) | Up to 8 devices (32 channels) | Up to 8 devices (32 channels) |
| Sample-Rate Change Behavior | 16-data-cycle blanking delay | 16-data-cycle blanking delay | Valid immediately after rate change | Valid immediately after rate change |
| AC Noise / Specs | Original family specs | Original family specs | Improved AC specifications | Improved AC specifications |
| Packaging Form | Tape & Reel (+T) | Tube (no +T) | Tape & Reel | Tube (no +T) |
主要差異化特點
- Simultaneous 4-channel sampling on a single die (對比Multi-channel SAR ADCs without track-and-hold)
- Cascadeable to 32 channels without external logic (對比Multi-channel sigma-delta parts that lack cascade)
- Pin-compatible in-house upgrade path (對比MAX11040GUU+ (no reel) and MAX11040KGUU+T (K-variant))
設計說明
Use a dedicated analog ground island tied to a single star-point near the ADC; the 24-bit sigma-delta resolves noise that a 16-bit SAR would average out. Route AVDD and DVDD from separate ferrite-bead-filtered rails and place 10 uF + 0.1 uF bypass pairs within 2 mm of each supply pin. Keep digital return currents (SCLK, DOUT, DRDY traces) physically separated from the analog input traces to avoid ground bounce coupling into AIN1-AIN4.
Route each analog input pair (AINx+ / AINx-) as a tightly coupled differential pair with 50 ohm characteristic impedance if the source is remote; add a 100 ohm common-mode choke plus 1 nF differential capacitor to ground near the ADC inputs. The TSSOP-38 package gives you enough GND pins on both analog and digital sides to put a guard ring around the analog inputs - stitch the guard ring with multiple vias back to the analog ground plane.
Do not skip the REFOUT bypass capacitor: 10 uF X7R minimum, placed within 3 mm of the REFOUT pin. The internal reference can drift or oscillate without proper bypassing. Also, when cascading multiple MAX11040 devices, drive XIN of every device from the same low-jitter clock source - per-device free-running crystals will introduce inter-device timing skew that defeats the whole purpose of cascade synchronization.
The TSSOP-38 package has modest thermal performance (theta_JA around 70 C/W on a 2-layer board with no airflow). At industrial temperatures the ADC itself dissipates only a few hundred milliwatts, so thermal failure is unlikely, but verify that local self-heating does not drift the internal reference more than your accuracy budget allows. Estimated: at Tambient = 85 C the junction rises by approximately 5 C above ambient, well within spec.
合規資訊
RoHS and lead-free confirmed via Maxim/Analog Devices product listing. Halogen-free status not stated in the provided data - marked unknown. AEC-Q100 not qualified; not intended for automotive safety-critical use.
