CS5528-ASZR - 24-Bit 8-Ch Sigma-Delta ADC w/ PGIA | Cirrus Logic
部品番号: CS5528-ASZR ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $9.45 | $9.45 |
| 10 | $8.65 | $86.50 |
| 100 | $7.87 | $787.00 |
| 500 | $7.1 | $3,550.00 |
| 1,000 | $6.45 | $6,450.00 |
CS5528-ASZR 概要
An instrumentation ADC such as the CS5528-ASZR is a precision data-conversion IC optimized for low-frequency, high-resolution measurement of small analog signals (e.g. strain gauges, RTDs, thermocouples, weigh scales). The category hierarchy is: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor. The chopper-stabilized front end cancels offset and 1/f drift, while the charge-balance sigma-delta modulator plus digital filter deliver true 24-bit noise-free resolution for DC and slow-moving signals.
Key features include on-chip calibration (self and system), per-channel PGA gain (1x to 32x nominal via input-span selection), differential bipolar inputs with 4-bit channel-ID tag, an integrated FIFO that decouples the host read rate from the conversion rate, and an SPI-compatible serial interface. A power-on reset and dedicated status registers simplify firmware bring-up, and the device supports both unipolar and true bipolar input ranges using a single positive supply.
Typical applications include industrial weigh scales and load-cell digitizers, multi-channel temperature acquisition via thermocouple/RTD front ends, process-control analog input modules, and 6- or 8-zone environmental monitoring panels. The 24-bit ENOB at low word rates gives >20 bits of effective resolution, which is sufficient for ratiometric bridge measurement, while the eight channels let one IC replace multiple single-channel ADCs on a compact PCB.
For best results, place a 1 nF to 10 nF film capacitor directly on the REFIN+/- pins and a 0.1 uF ceramic on VA/VD; route the analog and digital grounds separately and join them at a single star point beneath the IC. The PGIA gain should be chosen so the full-scale input span equals the largest expected sensor output to maximize dynamic range.
This page synthesizes Cirrus Logic datasheet specifications, current distributor pricing, drop-in alternatives and practical design notes into one place for engineers evaluating the CS5528-ASZR for precision multi-channel measurement.
ドロップイン代替品: CS5528-ASZR — 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。
クイック比較ツール — 並列比較する代替部品を選択:
CS5524-ASZR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
CS5528-ASZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
CS5522-ASZR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
CS5521-ASZR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
CS5523-ASZR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
CS5528-ASZR 最大定格＆電気的特性
| 分解能 | 24 bits |
| Number of Input Channels | 8 (differential, multiplexed) |
| Number of Converters | 1 |
| Architecture | Sigma-Delta (charge-balance) |
| Input Spans | 25 mV, 55 mV, 100 mV, 1 V, 2.5 V, 5 V (PGIA selectable) |
| Master Clock | 32.768 kHz (external) |
| Output Word Rate | 617 Hz (typical at MCLK = 32.768 kHz) |
| 電源電圧 | 3 V to 5 V |
| Data Interface | Serial (SPI-compatible) |
| Input Type | Differential, bipolar (true bipolar from single supply) |
| Integrated Front End | Chopper-stabilized instrumentation amplifier + PGIA |
| Calibration | Self and system calibration, on-chip |
| 特長 | Auto-calibration, multiplexers, power-on reset, bipolar input, integrated modulator, FIFO buffer, built-in digital filter |
| パッケージ | 24-SSOP (0.209 inch, 5.30 mm body width) |
| 実装タイプ | Surface Mount |
| 動作温度 | -40 C to +85 C |
| Packaging | Tape & Reel (TR) |
| RoHS | Compliant |
| Family | CS5521/CS5522/CS5523/CS5524/CS5528 |
CS5528-ASZR ピン構成
| ピン 1 | AIN1+ — Differential analog input 1, positive |
| ピン 2 | AIN1- — Differential analog input 1, negative |
| ピン 3 | AIN2+ — Differential analog input 2, positive |
| ピン 4 | AIN2- — Differential analog input 2, negative |
| ピン 5 | AIN3+ — Differential analog input 3, positive |
| ピン 6 | AIN3- — Differential analog input 3, negative |
| ピン 7 | AIN4+ — Differential analog input 4, positive |
| ピン 8 | AIN4- — Differential analog input 4, negative |
| ピン 9 | CS — Chip select (active low) for SPI |
| ピン 10 | SCLK — Serial clock for SPI |
| ピン 11 | SDI — Serial data input (MOSI) |
| ピン 12 | SDO — Serial data output (MISO) |
| ピン 13 | A0 — Address/control input |
| ピン 14 | REFIN+ — Positive reference input |
| ピン 15 | REFIN- — Negative reference input |
| ピン 16 | VA — Analog supply voltage |
| ピン 17 | GND — Digital ground |
| ピン 18 | VD — Digital supply voltage |
| ピン 19 | AOGND — Analog output ground (REF return) |
| ピン 20 | AVDD — Analog positive reference output (buffered) |
| ピン 21 | AIN5+ — Differential analog input 5, positive |
| ピン 22 | AIN5- — Differential analog input 5, negative |
| ピン 23 | AIN6+/AIN7 — Multiplexed input - per datasheet family pin map |
| ピン 24 | AIN8/REF2 — Multiplexed input or secondary reference - per datasheet family pin map |
主な用途
CS5528-ASZR の用途: 6 件s: Industrial Weigh Scale / Load Cell Digitizer, Multi-Channel Thermocouple / RTD Temperature Acquisition, Process-Control Analog Input Module (PLC/RTU), Multi-Zone Environmental Monitoring Panel, Strain-Gauge Bridge Sensor Array, Precision Multi-Channel Data Logger.
Industrial Weigh Scale / Load Cell Digitizer
The CS5528-ASZR's 24-bit noise-free resolution and chopper-stabilized instrumentation amplifier make it ideal for digitizing multi-channel load-cell bridges in industrial weigh scales. The PGIA accepts 25 mV to 5 V spans, so a 1-4 mV/V bridge excited at 10 V sits cleanly on the 55 mV or 100 mV span, giving 19+ effective bits at the 617 Hz word rate. Eight differential channels let one IC handle a 4-corner platform scale plus 4 reference/calibration channels. The integrated digital filter removes 50/60 Hz line noise without external filtering, and the on-chip self/system calibration cancels offset and gain drift over temperature, ensuring long-term scale accuracy of 0.01% or better.
おすすめ
Multi-Channel Thermocouple / RTD Temperature Acquisition
With eight true-bipolar differential inputs and on-chip cold-junction compensation support, the CS5528-ASZR can digitize up to eight thermocouples or 4-wire RTDs through a single IC. The PGIA's 25 mV span resolves the ~40 uV/C output of a type-K thermocouple with sub-0.1 C resolution when oversampled at the 617 Hz word rate, while the chopper-stabilized front end cancels the 1/f noise that typically limits low-frequency thermocouple measurement. Differential signaling and high CMRR reject common-mode 50/60 Hz pickup on long thermocouple leads, and the SPI interface streams calibrated, linearized data to the host MCU for further engineering-unit conversion.
おすすめ
Process-Control Analog Input Module (PLC/RTU)
Process-control PLCs and remote terminal units (RTUs) typically need 4-8 channels of 4-20 mA or 0-10 V analog input with industrial-grade accuracy. The CS5528-ASZR provides 8 differential channels with PGIA spans matching the 1 V / 2.5 V / 5 V common instrumentation ranges, so a 250 ohm shunt converts 4-20 mA into 1-5 V for direct connection. The -40 C to +85 C operating range handles outdoor and factory-floor environments, while the SPI interface simplifies connection to industrial MCUs. The on-chip FIFO decouples the host read rate from the conversion rate, freeing the CPU for protocol stack tasks such as Modbus or HART.
おすすめ
Multi-Zone Environmental Monitoring Panel
Building-management and clean-room monitoring panels require simultaneous acquisition of temperature, humidity (via 0-5 V sensors), and airflow (via differential pressure transducers) across 6-8 zones. The CS5528-ASZR's 8 channels and 24-bit resolution let one IC digitize a full panel without analog multiplexing losses, while the chopper-stabilized instrumentation amplifier rejects the common-mode noise from HVAC switching power supplies. The 5 V single-supply operation simplifies integration with HVAC controllers, and the integrated FIFO buffer eases burst-mode acquisition during alarm events, ensuring no zone sample is missed.
おすすめ
Strain-Gauge Bridge Sensor Array
Structural-health and fatigue-monitoring systems often deploy an array of strain gauges (350 ohm bridges with ~2 mV/V output) to map stress across a bridge, aircraft wing, or pressure vessel. The CS5528-ASZR's 25 mV and 55 mV PGIA spans, paired with chopper stabilization, provide the dynamic range to capture microstrain without sacrificing DC accuracy. Eight channels per IC allow 32-channel systems to be built from just four ADCs, while the SPI interface synchronizes sampling across multiple ICs via a shared SCLK and CS line. The integrated self-calibration compensates for thermal drift in the gauge itself, supporting long-term field deployment.
おすすめ
Precision Multi-Channel Data Logger
Portable and laboratory data loggers that record DC voltage, thermocouple, and bridge signals benefit from the CS5528-ASZR's combination of 24-bit noise-free resolution, 8 differential channels, and low 3-5 V supply operation. Battery-powered designs run from a single Li-ion cell plus LDO, and the ~617 Hz word rate is fast enough for transient capture while still allowing deep averaging for sub-microvolt measurements. The on-chip FIFO and auto-calibration simplify firmware, letting the host MCU enter sleep between bursts and wake only to read conversion results, which extends battery life for unattended field deployments.
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: CS5528-ASZR — 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 | CS5524-ASZR | CS5528-ASZ | CS5522-ASZR | CS5521-ASZR | CS5523-ASZR |
|---|---|---|---|---|---|---|
| Brand | Cirrus Logic | Cirrus Logic - same | Cirrus Logic - same | Cirrus Logic - same | Cirrus Logic - same | Cirrus Logic - same |
| Package | SSOP-24 (5.30 mm) | SSOP-24 - same | SSOP-24 - same | SSOP-24 - same | SSOP-24 - same | SSOP-24 - same |
| Resolution | 24-bit | 24-bit - same | 24-bit - same | 24-bit - same | 16-bit (-33%) | 16-bit (-33%) |
| Number of Channels | 8 differential | 4 (-50%) | 8 - same | 2 (-75%) | 2 (-75%) | 4 (-50%) |
| Architecture | Sigma-Delta (charge-balance) | Sigma-Delta - same | Sigma-Delta - same | Sigma-Delta - same | Sigma-Delta - same | Sigma-Delta - same |
| Master Clock | 32.768 kHz | 32.768 kHz - same | 32.768 kHz - same | 32.768 kHz - same | 32.768 kHz - same | 32.768 kHz - same |
| Output Word Rate | 617 Hz | 617 Hz - same | 617 Hz - same | 617 Hz - same | 617 Hz - same | 617 Hz - same |
| Input Spans (PGIA) | 25 mV to 5 V | 25 mV to 5 V - same | 25 mV to 5 V - same | 25 mV to 5 V - same | 25 mV to 5 V - same | 25 mV to 5 V - same |
| Supply Voltage | 3 V to 5 V | 3 V to 5 V - same | 3 V to 5 V - same | 3 V to 5 V - same | 3 V to 5 V - same | 3 V to 5 V - same |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C - same | -40 C to +85 C - same | -40 C to +85 C - same | -40 C to +85 C - same | -40 C to +85 C - same |
主な差別化要因
- Highest channel count in the CS5521/22/23/24/28 family （vs CS5524-ASZR)
- 24-bit sigma-delta with chopper-stabilized instrumentation front end （vs CS5521-ASZR)
- Six PGIA input spans matching real-world sensor outputs （vs CS5523-ASZR)
- On-chip system calibration and FIFO buffer （vs External ADCs without FIFO)
設計ノート
Estimated: at VA = VD = 5 V the CS5528-ASZR draws approximately 6 mA continuously (per CS5521/22/23/24/28 family datasheet). Decouple VA, VD and AVDD with separate 0.1 uF X7R ceramic capacitors placed within 3 mm of each supply pin, plus a shared 10 uF tantalum or ceramic bulk capacitor on the analog rail. This star-style decoupling keeps digital switching transients out of the analog ground return path and preserves the 24-bit noise floor.
Route REFIN+ and REFIN- as a tightly coupled differential pair directly from an external low-noise reference (e.g. REF5025 or LT1236). Place a 10 nF film bypass capacitor directly across REFIN+/- pins. Keep analog input traces guarded with a ground-trace on both sides to prevent leakage from nearby digital lines; high-impedance PGIA inputs can resolve < 1 uA leakage, so PCB cleanliness is essential for the 24-bit performance.
Drive the 32.768 kHz MCLK from a clean CMOS source with < 50 ns rise/fall time; jitter on MCLK translates directly into conversion noise. CS5528-ASZR's integrated digital sinc filter provides first-order nulls at the MCLK frequency and harmonics, so a stable, low-jitter crystal or oscillator source is recommended over resonator-based clocks. Keep the MCLK trace short and away from switching power inductors.
Do not leave the CS pin floating during ADC startup - the device samples the CS pin on power-on reset to configure SPI mode. Tie A0 either high or low (do not float) to set the LSB of the SPI address. Run a system calibration after power-up and a self calibration whenever the operating temperature changes by more than 10 C, otherwise the internal zero-scale and full-scale references will drift with temperature.
コンプライアンス情報
RoHS compliant and lead-free per distributor listings (DigiKey, Mouser, JLCPCB). REACH compliance status confirmed by Cirrus Logic product family declaration. AEC-Q100 not applicable - industrial-grade operating range only (-40 C to +85 C); not qualified for automotive safety applications.
