CS5324-BL 12-Bit Sigma-Delta ADC, 28-PLCC | Cirrus Logic
N.º de pieza: CS5324-BL ✓ ActivoCS5324-BL Descripción general
A sigma-delta ADC is a type of analog-to-digital converter that oversamples the input signal and shapes quantization noise into the out-of-band region, where it can be removed by a digital decimation filter. Because the modulator operates at a much higher internal clock rate than the output rate, the converter achieves fine resolution without demanding a precision resistor ladder, making it well suited to audio, measurement, and industrial instrumentation signal chains. In the signal-chain hierarchy it sits between an analog front end (sensor, op-amp) and a digital back end (microcontroller, DSP).
Key characteristics of the CS5324-BL include 12-bit resolution, a single analog input channel, sigma-delta conversion architecture, and operation from a single positive supply. Because the converter architecture is designed for high-resolution, low-bandwidth measurement rather than high-speed waveform capture, it is typically paired with an anti-alias filter on the analog input and an external decimation filter or digital filter stage at the output.
Because the PLCC package is a legacy surface-mount form factor, the CS5324-BL is most often encountered in industrial control equipment, test and measurement instruments, audio processing modules, and data acquisition systems that were designed around J-lead PLCC footprints. Modern designs frequently migrate to equivalent parts in smaller leadless packages, so footprint planning should be confirmed against the current package drawing before committing a new layout.
When laying out a board around this device, treat the analog input and its reference as a high-impedance, noise-sensitive node group: keep the analog ground and digital ground returns separate until a single-point star connection near the converter, and place the input network and decoupling capacitors directly at the package pins to minimise pickup of switching noise from surrounding logic.
The key trade-off in this converter is speed versus resolution. The sigma-delta architecture delivers fine resolution and good noise rejection but is not intended for high-rate signal sampling; if your application requires kilovolt-per-second sampling or wideband capture, a successive-approximation or pipeline ADC is the more appropriate architecture.
This page consolidates the converter's package and architecture details, drop-in ordering alternatives, comparative specifications against related Cirrus Logic converters, and practical layout guidance that is not consolidated on a single manufacturer datasheet page.
Alternativas directas para CS5324-BL — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
CS5324-CZ
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
CS5324-CL
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
CS5322-CL
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
CS5330-CL
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
CS5324-BL Valores máximos y características eléctricas
| Device Type | Analog-to-Digital Converter (ADC) |
| Resolución | 12 bit |
| Number of Input Channels | 1 (single input) |
| Conversion Architecture | Sigma-Delta |
| Package Type | PLCC-28 (J-Lead) |
| Package Body Size | 11.51 mm x 11.51 mm |
| Tipo de montaje | Surface Mount |
| Lead Style | J-Lead (PLCC) |
| Número de pines | 28 |
| Número de salidas | 1 |
| Categoría | Data Acquisition - Analog to Digital Converters (ADC) |
| Manufacturer | Cirrus Logic Inc. |
| Manufacturing Status | In active production |
| Supply Channel | Rochester Electronics |
Guía de configuración de pines de CS5324-BL 11.51 mm x 11.51 mm
Configuración de pines para CS5324-BL (encapsulado 11.51 mm x 11.51 mm). Este componente analógico presenta pines de entrada, salida y alimentación. Consulte la hoja de datos del fabricante para conocer las configuraciones de los pines de ajuste de offset, compensación y habilitación. Ideal para circuitos de acondicionamiento de señal y amplificadores.
No hay datos detallados de patillaje disponibles para CS5324-BL.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
CS5324-BL es adecuado para 6 aplicacións: Industrial Process Measurement Front End, Audio Signal Acquisition and Monitoring, Test and Measurement Data Acquisition, Data Acquisition and Logging Modules, Legacy Equipment Repair and Obsolescence Mitigation, Environmental and Energy Metering Sensors.
Industrial Process Measurement Front End
The CS5324-BL suits slow-changing process variables such as temperature, pressure and level because a sigma-delta converter delivers a stable, high-resolution code from a modest analog front end. A 12-bit, single-input converter with one analog channel fits a single-loop transmitter or a multiplexed sensor node where each channel is conditioned by a buffer and an RC anti-alias network. The 28-pin PLCC package is a natural fit for industrial control boards built around J-lead footprints, and the device is listed as being in active production, which supports both new builds and long-term spares. The main design trade-off is speed: a sigma-delta architecture is optimised for resolution and noise rejection, not for sampling fast transients, so use it on settled signals rather than on waveforms.
Recomendado
Audio Signal Acquisition and Monitoring
For audio monitoring, metering and broadcast confidence-check equipment, the CS5324-BL converts a conditioned line-level or microphone-amplified signal into a 12-bit digital stream with the noise-shaping behaviour typical of sigma-delta converters. Twelve bits is adequate for level metering, monitoring mixes and many consumer audio paths where the full perceptual range is not required. The converter is normally fed by an op-amp buffer and a passive two-pole anti-alias filter, with a digital decimation filter performing the final noise removal. Compared with a successive-approximation converter it trades conversion rate for resolution, and compared with a 24-bit sigma-delta part it gives up about 12 dB of dynamic range, so keep the analog front end quiet and well referenced.
Recomendado
Test and Measurement Data Acquisition
Instrumentation front ends built on legacy J-lead PLCC footprints often rely on the CS5324-BL for slow-precision channels such as thermometer, strain and bridge outputs. Sigma-delta noise shaping lets a low-cost 12-bit converter achieve a usable noise floor on low-level signals when the input is properly buffered and filtered, which is the main reason it appears in older bench instruments and factory test systems. Use a guarded analog layout with a dedicated analog ground region and star-connected return to the converter. Because the 12-bit code limits small-signal resolution, specify an instrumentation amplifier with adequate gain ahead of the converter and reserve the digital decimation filter for removing the shaped out-of-band noise.
Recomendado
Data Acquisition and Logging Modules
The CS5324-BL appears naturally in compact data acquisition modules that digitise one analog channel and hand the result to a microcontroller over a serial interface. Its single-input, 12-bit sigma-delta configuration maps directly onto per-sensor acquisition nodes in building automation, environmental monitoring and energy metering equipment, where each node reports one slow-moving quantity. Pair the converter with an anti-alias network, a buffered reference and an MCU that performs decimation and averaging, which dramatically improves the effective resolution of the 12-bit output. The single analog input is the main architectural limitation - multiplexing several sensors ahead of one converter costs sample rate - so use multiple converters or a multiplexer with an adequate settling time when channel count grows.
Recomendado
Legacy Equipment Repair and Obsolescence Mitigation
Because the CS5324-BL is listed as being in active production with an available supply channel, it is a strong candidate for repairing industrial instruments, printers and test platforms that were designed around the 28-pin PLCC footprint. Field engineers can populate the same land pattern without respinning the board or relearning the analog layout, and the converter's 12-bit, single-input sigma-delta behaviour matches the original design intent exactly. When planning a repair, verify the full order code including temperature grade, confirm the analog supply rail tolerances against the original schematic, and re-check the reference decoupling because the PLCC footprint places the pins further from the board centre than a modern leadless alternative would.
Recomendado
Environmental and Energy Metering Sensors
The CS5324-BL addresses the metering segment well: slow, small-magnitude signals from thermistors, humidity probes and current transformers need resolution and stable references more than they need speed, exactly the profile of a sigma-delta converter. A single analog channel with an external anti-alias filter is enough for a compact metering node, and the 12-bit code can be stretched further by oversampling and averaging in the host microcontroller. The trade-off to plan for is that the PLCC package is a legacy form factor, so new metering designs should confirm footprint availability early, and any current-transformer front end needs careful isolation and fusing ahead of the converter input.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para CS5324-BL — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | CS5324-CZ | CS5324-CL | CS5322-CL | CS5330-CL |
|---|---|---|---|---|---|
| Package | PLCC-28 (J-Lead) | PLCC-28 (J-Lead) - same | PLCC-28 (J-Lead) - same | PLCC-28 (J-Lead) - same | PLCC-28 (J-Lead) - same |
| Brand | Cirrus Logic | Cirrus Logic | Cirrus Logic | Cirrus Logic | Cirrus Logic |
| Resolution | 12 bit | 12 bit | 12 bit | 24 bit | 24 bit |
| Conversion Architecture | Sigma-Delta | Sigma-Delta | Sigma-Delta | Sigma-Delta | Sigma-Delta |
| Input Channels | 1 | 1 | 1 | 2 | 2 |
| Package Body Size | 11.51 mm x 11.51 mm | 11.51 mm x 11.51 mm | 11.51 mm x 11.51 mm | 11.51 mm x 11.51 mm | 11.51 mm x 11.51 mm |
| Mounting Type | Surface Mount (J-Lead) | Surface Mount (J-Lead) | Surface Mount (J-Lead) | Surface Mount (J-Lead) | Surface Mount (J-Lead) |
| Order-Code Suffix Significance | -BL (28-pin PLCC) | -CZ (28-pin PLCC, lead-free code) | -CL (28-pin PLCC) | -CL (28-pin PLCC) | -CL (28-pin PLCC) |
Diferenciadores clave
- Same-family PLCC-28 alternatives keep the existing board footprint (frente a CY28331OC-2)
- 12-bit resolution is sufficient for many measurement nodes, cutting front-end cost (frente a CS5322-CL)
- Single-input configuration keeps the analog routing simple (frente a CS5330-CL)
- Active production status for a legacy PLCC footprint (frente a CS5324-CZ)
Notas de diseño
Treat the analog input, reference and analog supply pins as one high-impedance island on the PCB. Place the anti-alias RC network and the input bypass capacitors directly at the PLCC pins rather than at the sensor or connector, because the J-lead package places the pins physically far from the board centre and every millimetre of trace adds pickup of switching noise. Route the analog ground and digital ground separately to a single star point close to the converter's ground pins, and keep switching regulators and fast digital nets physically away from the analog island.
Do not treat the sigma-delta converter as a general-purpose sampling ADC. The internal modulator and decimation chain optimise for resolution at low throughput, so using the CS5324-BL on fast transients produces aliased and heavily filtered results. Another frequent mistake is omitting the digital decimation filter or assuming the raw modulator output is usable; the shaped noise must be filtered before the data is meaningful. Finally, confirm the exact order code, because several PLCC-28 pack codes circulate for this family and mixing them up can change temperature grade and lead-free status without changing the pinout.
The PLCC-28 J-lead footprint demands more solder-paste than a leadless equivalent. Tune the aperture area for the wide J-feet, verify fillet formation on the first article, and check for solder bridging between the closely spaced J-lead tips at fine pitch. Because the package is a legacy form factor, keep the land pattern drawn to the standard PLCC-28 dimensions of 11.51 mm x 11.51 mm body, and confirm that the assembly house has the right stencil and placement tooling for J-lead PLCC before releasing the build.
Estimated: the converter's own dissipation is dominated by its supply current multiplied by the analog supply voltage, but without the device current specification the absolute figure cannot be calculated. What can be stated is that the reference and analog supply rails must be quiet; feeding the converter from the same switching node that digitises the signal will inject supply ripple directly into the conversion result. Use a dedicated low-noise regulator for the analog rail, keep its loop area small and physically separated from the digital return path, and place bulk plus high-frequency decoupling at the converter pins.
Información de cumplimiento
Compliance declarations are published on the manufacturer product page and in the RoHS material declaration for the specific order code; request the current declarations for the exact CS5324-BL suffix through the Request a Quote form. AEC-Q100 qualification is not applicable to this industrial/legacy converter family as presented.
