CS5528-ASZR - 24-Bit 8-Ch Sigma-Delta ADC w/ PGIA | Cirrus Logic
Teilenummer: CS5528-ASZR ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 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 Übersicht
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.
Drop-in-Alternativen für CS5528-ASZR – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
CS5524-ASZR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
CS5528-ASZ
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
CS5522-ASZR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
CS5521-ASZR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
CS5523-ASZR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
CS5528-ASZR Grenzwerte & elektrische Eigenschaften
| Auflösung | 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) |
| Versorgungsspannung | 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 |
| Eigenschaften | Auto-calibration, multiplexers, power-on reset, bipolar input, integrated modulator, FIFO buffer, built-in digital filter |
| Gehäuse | 24-SSOP (0.209 inch, 5.30 mm body width) |
| Montageart | Surface Mount |
| Betriebstemperatur | -40 C to +85 C |
| Packaging | Tape & Reel (TR) |
| RoHS | Compliant |
| Family | CS5521/CS5522/CS5523/CS5524/CS5528 |
CS5528-ASZR Pin-Konfiguration
| Pin 1 | AIN1+ — Differential analog input 1, positive |
| Pin 2 | AIN1- — Differential analog input 1, negative |
| Pin 3 | AIN2+ — Differential analog input 2, positive |
| Pin 4 | AIN2- — Differential analog input 2, negative |
| Pin 5 | AIN3+ — Differential analog input 3, positive |
| Pin 6 | AIN3- — Differential analog input 3, negative |
| Pin 7 | AIN4+ — Differential analog input 4, positive |
| Pin 8 | AIN4- — Differential analog input 4, negative |
| Pin 9 | CS — Chip select (active low) for SPI |
| Pin 10 | SCLK — Serial clock for SPI |
| Pin 11 | SDI — Serial data input (MOSI) |
| Pin 12 | SDO — Serial data output (MISO) |
| Pin 13 | A0 — Address/control input |
| Pin 14 | REFIN+ — Positive reference input |
| Pin 15 | REFIN- — Negative reference input |
| Pin 16 | VA — Analog supply voltage |
| Pin 17 | GND — Digital ground |
| Pin 18 | VD — Digital supply voltage |
| Pin 19 | AOGND — Analog output ground (REF return) |
| Pin 20 | AVDD — Analog positive reference output (buffered) |
| Pin 21 | AIN5+ — Differential analog input 5, positive |
| Pin 22 | AIN5- — Differential analog input 5, negative |
| Pin 23 | AIN6+/AIN7 — Multiplexed input - per datasheet family pin map |
| Pin 24 | AIN8/REF2 — Multiplexed input or secondary reference - per datasheet family pin map |
Typische Anwendungen
CS5528-ASZR ist geeignet für 6 Anwendungs: 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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für CS5528-ASZR – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | 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 |
Wichtigste Unterscheidungsmerkmale
- 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)
Designhinweise
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.
Compliance-Informationen
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.
