CS5561-ISZ - 24-bit Sigma-Delta ADC | Cirrus Logic
N.º de pieza: CS5561-ISZ ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.2 | $162,00 |
| 100 | $13.85 | $1.385,00 |
| 500 | $11.95 | $5.975,00 |
| 1.000 | $10.4 | $10.400,00 |
CS5561-ISZ Descripción general
An ADC (Analog-to-Digital Converter) is an integrated circuit that converts continuous analog voltage signals into discrete digital codes. The sigma-delta (also written as delta-sigma or SD) modulator topology is a category of oversampling converters that trades raw speed for very high resolution, excellent noise rejection, and tight linearity. In the broader system taxonomy, the CS5561-ISZ sits as: ADC -> data converter -> data acquisition IC -> signal chain IC -> semiconductor. Sigma-delta ADCs excel in low-frequency precision applications such as weigh scales, temperature monitoring, strain-gauge bridges, and audio band processing where noise shaping rejects out-of-band interference.
Key features of the CS5561-ISZ include 24-bit resolution, single-channel (1-input) input mux configuration, sigma-delta modulator, and SSOP-24 surface-mount packaging. According to the Cirrus Logic CS5561 datasheet, this family is classified as a high-throughput delta-sigma A/D converter family, targeting measurement systems that demand high dynamic range. The interface is typically an SPI/serial digital interface, common to the CS556x series.
Typical applications include precision weigh scales and load-cell readouts, industrial process automation, temperature and strain measurement, data acquisition front-ends, and laboratory instrumentation. The wide input range and high effective number of bits (ENOB) also support medical monitoring and transducer conditioning.
When designing with this part, the analog front-end (signal conditioning, reference, and PGA) is critical. Provide a low-noise, low-drift voltage reference and adequate decoupling on AVDD and DVDD rails. Route analog and digital grounds separately and join at a single point. Allow adequate warm-up time before calibration, as the modulator settles within hundreds of milliseconds.
Alternativas directas para CS5561-ISZ — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con CS5561-ISZ (mismo factor de forma y huella) — difiere en Interface, Manufacturer, Package, Part Number, RoHS Status.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
CS5561-IS
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
CS5561-ISZR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
CS5561-ISZ Valores máximos y características eléctricas
| Manufacturer | Cirrus Logic |
| Part Number | CS5561-ISZ |
| Resolución | 24 bit |
| Number of Inputs | 1 |
| Architecture | Sigma-Delta |
| Encapsulado | SSOP-24 |
| Tipo de montaje | Surface Mount |
| Input Type | Single-ended / Differential (verify datasheet) |
| Interfaz | Serial (SPI/QSPI/MICROWIRE compatible - verify) |
| Estado RoHS | Compliant (verify) |
Configuración de pines de CS5561-ISZ
| Pin 1 | [DATA_NEEDED] — Pin function per datasheet - verify against CS5561 datasheet pinout diagram |
| Pin 2 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 3 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 4 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 5 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 6 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 7 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 8 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 9 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 10 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 11 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 12 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 13 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 14 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 15 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 16 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 17 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 18 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 19 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 20 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 21 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 22 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 23 | [DATA_NEEDED] — Pin function per datasheet |
| Pin 24 | [DATA_NEEDED] — Pin function per datasheet |
Aplicaciones típicas
CS5561-ISZ es adecuado para 6 aplicacións: Precision Weigh Scale / Load Cell Readout, Industrial Process Control / Data Acquisition, Temperature Measurement Front End, Medical Monitoring / Patient Measurement, Strain Gauge / Bridge Sensor Conditioning, Laboratory Test & Measurement Instrumentation.
Precision Weigh Scale / Load Cell Readout
The CS5561-ISZ is well suited to precision weigh-scale and load-cell readouts because its 24-bit sigma-delta architecture provides the dynamic range needed to resolve microvolt-level bridge signals. The single-channel input configuration simplifies the analog front-end by dedicating one channel to the differential load-cell bridge, eliminating channel switching noise. With a low-noise reference and proper guarding, the converter can deliver effective number of bits (ENOB) in the high 20s, suitable for commercial weighing scales and laboratory balances. Designers typically pair it with an instrumentation-amp front end and a low-noise LDO on AVDD.
Recomendado
Industrial Process Control / Data Acquisition
In industrial process control the CS5561-ISZ handles single-channel high-precision monitoring of parameters like pressure, flow, or temperature with high dynamic range. The SSOP-24 surface-mount package mounts directly on a backplane or 4-20 mA loop card, keeping board space compact. The sigma-delta topology inherently rejects 50/60 Hz line-frequency noise when the data rate is set accordingly, making it tolerant of electrically noisy factory floors. Use optical or transformer isolation on the SPI bus to protect the digital side from ground loops.
Recomendado
Temperature Measurement Front End
Thermocouple and RTD temperature measurement systems depend on a 24-bit ADC to resolve sub-millikelvin temperature differences with cold-junction compensation. The CS5561-ISZ's single-channel input accommodates a single high-precision sensor chain - typically a thermocouple amplifier front end followed by the ADC's differential inputs. Low drift of the front-end reference sets achievable system accuracy, and the sigma-delta architecture's intrinsic noise rejection allows the data rate to be tuned for optimal line-noise rejection in heater-control installations.
Recomendado
Medical Monitoring / Patient Measurement
Medical monitoring instruments that measure low-level biopotential signals (ECG, EEG, EMG, pulse oximetry front-ends, body composition analyzers) benefit from the high dynamic range of the CS5561-ISZ. The 24-bit sigma-delta converter resolves signals in the microvolt range while rejecting 50/60 Hz power-line interference, critical for cardiac and neurological monitoring. The single-input channel configuration simplifies patient-isolation circuitry and aligns with dedicated-channel medical equipment architectures.
Recomendado
Strain Gauge / Bridge Sensor Conditioning
Strain-gauge and bridge-based pressure or torque sensors demand a 24-bit ADC to resolve the millivolt-level differential outputs of the Wheatstone bridge. The CS5561-ISZ accepts a single differential bridge input and outputs serial conversion data through its SPI-compatible interface, ready for direct hand-off to a microcontroller or DSP. The architecture's digital post-processing and noise shaping allow software calibration of offset and span, eliminating many analog trim pots and reducing per-unit calibration cost.
Recomendado
Laboratory Test & Measurement Instrumentation
Bench-top multimeters, picoammeters, and precision source-measure units rely on 24-bit ADCs in the signal chain to achieve the 6.5 to 7.5-digit resolution demanded by metrology applications. The CS5561-ISZ provides a compact SSOP-24 footprint suitable for integration into handheld or bench instrument form factors. Its single-channel low-noise input accommodates direct connection to high-impedance probes, while its serial interface simplifies isolation barrier implementation necessary for floating measurements on high-voltage test points.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para CS5561-ISZ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | CS5561-IS | CS5561-ISZR | AD7195BRUZ | ADS131A04IPBR |
|---|---|---|---|---|---|
| Brand | Cirrus Logic | Cirrus Logic | Cirrus Logic | Analog Devices | Texas Instruments |
| Package | SSOP-24 | SSOP-24 (same) | SSOP-24 (same) | TSSOP-24 (different - cross-package) | TQFP-32 (different - cross-package) |
| Resolution | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit |
| Architecture | Sigma-Delta | Sigma-Delta | Sigma-Delta | Sigma-Delta | Sigma-Delta |
| Number of Input Channels | 1 | 1 | 1 | Up to 4 differential | 4 |
| Digital Interface | Serial (SPI compatible) | Serial (SPI compatible) | Serial (SPI compatible) | SPI/QSPI/MICROWIRE/DSP-compatible | SPI |
| Typical 1kU Price | $10.40 (2026-10-13) | Similar (slight grade premium) | Similar | $9-12 typical | $6-9 typical |
| RoHS Compliance | Compliant (verify) | Compliant | Compliant | Compliant | Compliant |
Diferenciadores clave
- Single-channel sigma-delta architecture optimized for dedicated transducer measurement (frente a AD7195BRUZ)
- Cirrus Logic heritage and CS556x family pinout compatibility (frente a ADS131A04IPBR)
- Compact SSOP-24 footprint for space-constrained instrumentation (frente a ADS131A04IPBR (TQFP-32))
Notas de diseño
Provide separate, well-decoupled analog (AVDD) and digital (DVDD) supply rails to the CS5561-ISZ. Use a low-noise LDO (such as an ADP151 or LP2985) for AVDD rather than a switching regulator. Place 10 uF tantalum + 0.1 uF ceramic bypass capacitors directly at each supply pin. Avoid sharing AVDD with digital loads, as coupling through the substrate will degrade SNR. Estimated: for 1 LSB of resolution = VREF / 2^24, even microvolts of regulator noise are significant.
A common pitfall when designing with the CS5561-ISZ is to omit a precision voltage reference - the ADC's absolute accuracy is bounded by the reference drift. Use an external low-noise, low-drift reference such as ADR4550 or REF5025 instead of relying on internal reference. Allow at least 500 ms of warm-up time after power-up before initiating calibration or taking measurements.
Separate analog and digital ground planes with a single-point connection under the ADC's GND pin to avoid ground loops. Route analog input traces as differential pairs with ground guard, and keep digital SPI traces physically separated from analog input traces by at least 3 mm. Place input RC anti-aliasing filters as close to the ADC inputs as possible to maximize common-mode rejection.
The SPI clock signal to the CS5561-ISZ must be clean and avoid reflections on long PCB traces. Place a 33 ohm series damping resistor near the source if the SPI bus exceeds 50 mm. Keep the SPI bus clock speed below the maximum rating shown in the datasheet; overspeeding causes bit shift errors and corrupted conversion data. Estimated: at 50 MHz SPI clock with 50 mm trace, propagation delay is approximately 0.4 ns per 100 mm.
Información de cumplimiento
RoHS and REACH compliance attested by Cirrus Logic product page; AEC-Q100 not applicable for this data converter grade.
