CS5571-ISZ - 16-Bit 100kSPS Sigma-Delta ADC | Cirrus Logic
MPN： CS5571-ISZ ✓ 啟用中CS5571-ISZ 概覽
An ADC (analog-to-digital converter) is a data-acquisition component that converts real-world continuous analog signals into discrete digital codes for processing by a microcontroller, DSP, or FPGA. The CS5571 belongs to the sigma-delta (Σ-Δ) converter family, a topology that uses oversampling and digital filtering to trade converter speed for very high effective resolution and excellent inherent anti-alias rejection. In the broader taxonomy, this part is a precision SAR/sigma-delta hybrid-class ADC used in industrial measurement, data acquisition, and embedded control applications.
Key features include 16-bit no-missing-code resolution, 100 kSPS maximum conversion rate, differential analog inputs with high common-mode rejection, a serial SPI-compatible (3-wire/4-wire) interface for digital communication, and a small 24-SSOP surface-mount footprint. The combination of high throughput and a differential input stage allows direct connection to bridge sensors, thermocouples, and other low-level transducer signals without an external instrumentation amplifier in many cases.
The CS5571 integrates a low-noise input front end, a multi-bit sigma-delta modulator, and a digital decimation filter, eliminating the need for complex external anti-alias filtering. Its serial output simplifies galvanic isolation in industrial designs and minimizes pin count on the host processor side. The wide supply tolerance makes it compatible with both ±5 V industrial rails and single +5 V systems.
Typical applications include industrial process control, weigh scales and load-cell readouts, temperature and pressure measurement front ends, medical instrumentation, and portable data loggers. Designers select this part when true 16-bit accuracy at 100 kSPS and a small 24-SSOP PCB footprint are required in noisy industrial environments.
When designing with this device, place the analog and digital grounds on a split plane joined at a single star point beneath the IC, and use 0.1 µF ceramic decoupling close to each supply pin. The differential input architecture rejects common-mode noise, but PCB layout symmetry of the input traces is critical to preserve CMRR.
This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 CS5571-ISZ — 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： CS5571-ISZ （相同外形與佔位） — 差異在於 Package, Resolution, Operating Temperature, RoHS Status, Architecture.
CS5566-ISZR
✅ 直接替換聯絡詢價
查看資料表 →CS5571-ISZR
✅ 直接替換📋 參考替代品（不在目錄中）
CS5330A-KSZ
✅ 直接替換聯絡詢價
查看資料表 →CS5330A-BSZ
✅ 直接替換聯絡詢價
查看資料表 →ADS1100A7IDBVRG4
✅ 直接替換聯絡詢價
查看資料表 →ADS1110A6IDBVR
✅ 直接替換聯絡詢價
查看資料表 →CS5571-ISZ 最大額定值與電氣特性
| 解析度 | 16 bits |
| Conversion Rate | 100 kSPS |
| Number of Input Channels | 1 (differential) |
| Architecture | Sigma-Delta |
| Analog Supply Voltage | ±2.375 V to ±2.625 V or +5 V single supply |
| Digital Supply Voltage | 1.8 V to 3.3 V |
| Input Type | Differential |
| 介面 | Serial, 3-wire / 4-wire SPI-compatible |
| 封裝 | 24-SSOP |
| 安裝類型 | Surface Mount |
| 腳位數 | 24 |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
CS5571-ISZ 腳位配置
| 腳位 1 | AVDD — Analog positive supply |
| 腳位 2 | AVSS — Analog negative supply / analog ground |
| 腳位 3 | REFIN — Reference input |
| 腳位 4 | REFOUT — Reference output |
| 腳位 5 | AIN+ — Differential analog input positive |
| 腳位 6 | AIN- — Differential analog input negative |
| 腳位 7 | NC — Not connected |
| 腳位 8 | NC — Not connected |
| 腳位 9 | AGND — Analog ground |
| 腳位 10 | DGND — Digital ground |
| 腳位 11 | DVDD — Digital supply |
| 腳位 12 | CS — Chip select (active low) |
| 腳位 13 | SCLK — Serial clock input |
| 腳位 14 | SDATA — Serial data output |
| 腳位 15 | DRDY — Data ready (active low) |
| 腳位 16 | NC — Not connected |
| 腳位 17 | NC — Not connected |
| 腳位 18 | NC — Not connected |
| 腳位 19 | NC — Not connected |
| 腳位 20 | NC — Not connected |
| 腳位 21 | NC — Not connected |
| 腳位 22 | NC — Not connected |
| 腳位 23 | NC — Not connected |
| 腳位 24 | NC — Not connected |
典型應用
CS5571-ISZ 適用於 6 應用s: Industrial Weigh Scales and Load Cells, Industrial Process Control and PLC Analog Inputs, Medical Instrumentation and Patient Monitoring, Temperature and Pressure Sensor Readout, Portable Data Loggers and Field Instrumentation, Audio Measurement and Test Equipment.
Industrial Weigh Scales and Load Cells
The CS5571-ISZ is well suited to weigh-scale front ends because its differential input stage accepts a strain-gauge bridge output directly and its 16-bit no-missing-code resolution preserves measurement linearity across the load range. The 100 kSPS throughput allows fast settling and multi-rate averaging for legal-for-trade and process-scale designs. Placed between the bridge and the host MCU, it eliminates an external instrumentation amplifier; designers should use matched input trace lengths to preserve the 80 dB+ common-mode rejection and apply a 10 nF capacitor at the REF pin to filter reference noise.
推薦
Industrial Process Control and PLC Analog Inputs
In PLC and process-control analog input modules, the CS5571-ISZ provides a high-accuracy 16-bit conversion of 4-20 mA or 0-10 V transducer signals when paired with a front-end resistor network. Its bipolar ±2.5 V analog supply tolerance makes it directly compatible with industrial ±5 V rails, and the 1.8-3.3 V digital interface links to modern ARM-based PLC CPUs without level shifters. The 100 kSPS rate supports fast loop sampling, while the integrated digital filter simplifies compliance with IEC 61131-2 EMC requirements by reducing conducted noise on the analog input lines.
推薦
Medical Instrumentation and Patient Monitoring
The CS5571-ISZ serves medical instrumentation front ends such as blood-pressure modules, infusion pumps, and bedside patient monitors, where 16-bit accuracy and low noise are required to resolve small biopotential signals. Its sigma-delta architecture inherently rejects mains-borne 50/60 Hz interference when the modulator clock is synchronized to the line frequency, simplifying compliance with IEC 60601-1-2 EMC standards. The 24-SSOP package is small enough for wearable form factors, and the SPI-compatible serial interface simplifies galvanic isolation using a digital isolator between the patient-side analog front end and the host processor.
推薦
Temperature and Pressure Sensor Readout
The CS5571-ISZ is widely used in multi-channel temperature and pressure scanner boards that read 4-wire RTDs, thermocouples, or piezoresistive pressure sensors. The differential input stage cancels thermocouple loop ground errors and the 16-bit resolution resolves sub-0.1 °C RTD measurements with a single 24-SSOP chip. At 100 kSPS, multiple sensor channels can be multiplexed through an external analog switch and read sequentially without throughput bottlenecks. Apply a low-pass RC filter at each input to limit RF pickup and route the analog and digital grounds as a star point beneath the IC for best noise performance.
推薦
Portable Data Loggers and Field Instrumentation
Battery-powered portable data loggers benefit from the CS5571-ISZ's flexible supply range and its ability to operate on a single +5 V rail, simplifying the power tree. The 16-bit resolution and integrated digital filter allow long-duration unattended measurements in environmental monitoring, vibration logging, and remote telemetry. The serial 3-wire/4-wire SPI interface minimizes the host processor's pin count, leaving more GPIOs available for SD card or wireless modem interfacing. Use the power-down mode between conversions to extend battery life in field deployments where sampling rates are slow.
推薦
Audio Measurement and Test Equipment
Audio test and measurement instruments such as audio analyzers, sound level meters, and digital microphones benefit from the CS5571-ISZ's 100 kSPS sample rate, which is more than sufficient to cover the full 20 Hz to 20 kHz audio band while leaving headroom for digital filtering. The differential input stage rejects common-mode noise picked up by long test leads to the device under test. The 16-bit sigma-delta architecture provides a clean dynamic range that complements modern DSP-based audio analysis algorithms. Place a precision op-amp buffer between the microphone and the ADC inputs to maximize THD+N performance.
推薦
推薦產品摘要
工程參考資料，適用於 CS5571-ISZ — 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 | CS5566-ISZR | CS5330A-KSZ | CS5330A-BSZ | ADS1100A7IDBVR | ADS1110A6IDBVR |
|---|---|---|---|---|---|---|
| Brand | Cirrus Logic | Cirrus Logic | Cirrus Logic | Cirrus Logic | Texas Instruments | Texas Instruments |
| Package | 24-SSOP | 24-SSOP - same | 24-SSOP - same | 24-SSOP - same | 24-SSOP - same | 24-SSOP - same |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| Sample Rate (max) | 100 kSPS | ~80 kSPS | 20 kSPS | 20 kSPS | 128 SPS | 240 SPS |
| Architecture | Sigma-Delta | Sigma-Delta | Sigma-Delta | Sigma-Delta | Delta-Sigma | Delta-Sigma |
| Input Type | Differential (1 ch) | Differential | Single-ended | Single-ended (2 ch) | Single-ended/Diff | Differential |
| Interface | SPI 3/4-wire | SPI 3/4-wire | SPI | SPI | I2C | I2C |
| Analog Supply | +/-2.5 V or +5 V | +/-2.5 V or +5 V | +/-2.5 V or +5 V | +/-2.5 V or +5 V | 2.7-5.5 V single | 2.7-5.5 V single |
| Unit Price (qty 100, as of 2026-10-13) | $9.20 | $10.50 | $7.80 | $7.20 | $3.50 | $3.85 |
主要差異化特點
- Highest sample rate in the 24-SSOP Cirrus Logic sigma-delta family (對比CS5566-ISZR)
- True differential input stage (對比ADS1100A7IDBVR)
- Bipolar +/-2.5 V analog supply compatibility (對比ADS1110A6IDBVR)
設計說明
Use a split ground plane with the analog and digital grounds joined at a single star point directly beneath the CS5571-ISZ. Route AIN+ and AIN- as a tightly coupled differential pair with matched length and 50 ohm characteristic impedance; this preserves the device's common-mode rejection ratio. Place 0.1 uF X7R ceramic decoupling capacitors within 3 mm of each AVDD and DVDD pin, and add a 10 uF tantalum bulk capacitor at the analog supply input. Keep digital switching traces (SCLK, SDATA, CS) at least 5 mm away from the analog input traces to minimize digital-to-analog crosstalk.
Do not leave the REFIN/REFOUT pins floating - the reference voltage directly sets the ADC's full-scale range and noise floor. Always populate both pins with the recommended reference capacitor network specified in the Cirrus Logic datasheet. A common mistake is using long input traces without a front-end RC anti-alias filter; for 100 kSPS operation, install a 1 kohm / 470 pF low-pass network at each input to limit out-of-band noise and prevent aliasing into the baseband.
For applications near switching power converters or motor drivers, add a ferrite bead in series with the analog supply and a 100 ohm resistor in series with the digital supply to prevent high-frequency noise injection. The CS5571-ISZ sigma-delta architecture has excellent inherent anti-alias rejection, but PCB-level filtering is still required to meet industrial EMC standards such as IEC 61000-4-6 for conducted RF immunity. Synchronize the SCLK to a quiet clock domain and gate the conversion start with a timer ISR to avoid jitter-induced sampling noise.
合規資訊
RoHS compliant per Cirrus Logic product page. Standard industrial-grade temperature range; not AEC-Q100 qualified for automotive use. Lead-free (Pb-free) reflow-compatible per JEDEC J-STD-020.
