CS5530-ISZR - 24-bit Sigma-Delta ADC w/ PGA | Cirrus Logic
N.º de pieza: CS5530-ISZR ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $7.85 | $7,85 |
| 10 | $7.05 | $70,50 |
| 100 | $6.2 | $620,00 |
| 500 | $5.45 | $2.725,00 |
| 1.000 | $4.85 | $4.850,00 |
CS5530-ISZR Descripción general
A sigma-delta (ΔΣ) ADC is a type of analog-to-digital converter that oversamples the input signal and uses noise shaping to push quantization noise out of the signal band, then low-pass filters and decimates to produce a high-resolution digital output. Within the broader taxonomy, the CS5530 is an integrating-class, single-channel ADC belonging to the precision data converter family, sitting between successive-approximation ADCs (SAR) and high-speed pipeline ADCs in the converter hierarchy. It is one of the most popular 24-bit delta-sigma parts ever shipped for weigh-scale and process-control designs.
Key features include an effective resolution of up to 23 bits (true RMS), on-chip digital filtering with sinc³ response, an internal calibration register set (system and self calibration with calibration coefficients stored on-chip), and a simple three-wire serial port (SPI-/Microwire-compatible) for host MCU interfacing. The differential input front end supports a bipolar input range of ±5 V at gain = 1 using a single 5 V analog supply, with low-side or split-rail reference options.
From an architectural standpoint, the CS5530 combines a charge-balance modulator (4th-order sigma-delta modulator) with a digital sinc³ decimation filter. The four-level charge-balancing scheme produces an inherently monotonic, inherently linear conversion with no missing codes, ideal for precision DC measurement. The on-chip low-noise chopper-stabilized PGA eliminates the need for external instrumentation amplifiers in many bridge-sensor designs, reducing BOM cost and PCB area.
Typical applications include weigh scales / load-cell readouts, strain-gauge bridge transducers, temperature measurement using thermocouples or RTDs with excitation, digital panel meters, industrial process controllers, and battery-powered portable instrumentation. The combination of integrated PGA and high CMRR (>120 dB) makes it well-suited for transducer-based designs in electrically noisy factory environments.
Design consideration: the CS5530 is generally recommended for cost-sensitive single-channel precision DC measurement where software-driven calibration and gain setting are acceptable. For multi-channel simultaneous sampling or higher throughput, evaluate the pin-compatible CS5532 family.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, including verified EOL cross-references and CS5530-family compatibility information.
Alternativas directas para CS5530-ISZR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
CS5530-ISZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
CS5530-ASZ
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
CS5530-ASZR
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
SIG5530A
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LHA7530
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
CS5530-ISZR Valores máximos y características eléctricas
| Resolución | 24 bits |
| Architecture | Sigma-Delta (charge-balance, 4th-order modulator) |
| Number of Input Channels | 1 differential |
| Effective Resolution | Up to 23 bits (true RMS, gain = 1) |
| Output Word Rates | 7.5 Hz to 3840 Hz (programmable) |
| On-Chip PGA Gains | 1x, 2x, 4x, 8x, 16x, 32x, 64x |
| Common-Mode Rejection Ratio (CMRR) | >120 dB |
| Analog Supply Voltage (VA+) | 5 V (single supply typical) |
| Digital Supply Voltage (VD+) | 3.3 V to 5 V |
| Differential Input Range | ±5 V at gain = 1 (bipolar) |
| Reference Input | External voltage reference (differential REF+/REF-) |
| Digital Filter | Sinc³ (sin(x)/x)³, on-chip decimation |
| Serial Interface | 3-wire SPI / Microwire-compatible |
| On-Chip Calibration | Self and system calibration with on-chip coefficient storage |
| Encapsulado | 20-pin SSOP (ISZ) |
| Tipo de montaje | Surface Mount |
| Temperatura de funcionamiento | -40C to +85C (industrial) |
| Estado RoHS | Compliant |
| Lead-Free | Yes (per suffix -ISZ) |
Configuración de pines de CS5530-ISZR
| Pin 1 | VA+ — Analog positive supply (+5 V typical) |
| Pin 2 | AIN+ — Differential analog input, positive |
| Pin 3 | AIN- — Differential analog input, negative |
| Pin 4 | VA- — Analog ground (return for VA+) |
| Pin 5 | REF+ — Voltage reference, positive input |
| Pin 6 | REF- — Voltage reference, negative input |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | NC — Not connected (per datasheet) |
| Pin 10 | SDO — Serial data output (SPI/Microwire) |
| Pin 11 | SDI — Serial data input (SPI/Microwire) |
| Pin 12 | SCLK — Serial clock input (SPI/Microwire) |
| Pin 13 | CS — Chip select, active low |
| Pin 14 | DGND — Digital ground |
| Pin 15 | VD+ — Digital positive supply (+3.3 V to +5 V) |
| Pin 16 | XIN — Crystal oscillator input (or external clock) |
| Pin 17 | XOUT — Crystal oscillator output |
| Pin 18 | MODE — Mode select / calibration pin |
| Pin 19 | A0 — Address / configuration pin |
| Pin 20 | VA+ — Analog positive supply (duplicate pin, pin 1 repeat for low-impedance) |
Aplicaciones típicas
CS5530-ISZR es adecuado para 6 aplicacións: Weigh Scale / Load Cell Readout, Strain Gauge Bridge Transducer Readout, Precision Temperature Measurement (RTD / Thermocouple), Digital Panel Meter / Process Indicator, Industrial Process Controller Front End, Battery-Powered Portable Instrumentation.
Weigh Scale / Load Cell Readout
The CS5530-ISZR is the de facto reference part for single-load-cell weigh-scale designs because its integrated 1x-64x chopper-stabilized PGA connects directly to a 350 ohm or 1 kohm strain-gauge Wheatstone bridge without external instrumentation amplifiers. The 24-bit sigma-delta modulator delivers true RMS effective resolution of up to 23 bits at low output word rates, enabling display resolutions of 0.01 kg or better at 1 kg full scale. The on-chip self and system calibration registers compensate for bridge offset and gain drift over temperature, eliminating periodic field recalibration. Placed between the bridge and an MCU's SPI bus with a 5 V analog supply and a precision 2.5 V reference, the CS5530 outperforms discrete INA-based designs on both noise and BOM cost.
Recomendado
Strain Gauge Bridge Transducer Readout
The CS5530-ISZR's on-chip low-noise chopper-stabilized PGA accepts the millivolt-level differential output of a strain-gauge bridge directly, eliminating the need for a separate instrumentation amplifier in pressure transducers, force sensors, and load-pin assemblies. The PGA's selectable gains of 1x through 64x allow the bridge excitation voltage to be optimized for sensor sensitivity, while the 24-bit sigma-delta ADC quantizes the bridge output with effective resolution up to 23 bits at 60 Hz output word rate. CMRR above 120 dB rejects line-frequency common-mode noise in industrial environments, simplifying shielding and grounding. Used in 4-wire bridge wiring with the on-chip calibration registers, the CS5530 achieves <0.1% FS total error over the industrial temperature range.
Recomendado
Precision Temperature Measurement (RTD / Thermocouple)
The CS5530-ISZR serves as the ADC front end for precision RTD and thermocouple temperature measurement modules, where the 24-bit sigma-delta resolution and integrated low-noise PGA handle the small mV-level signals from PT100/PT1000 RTDs or K-type thermocouples. At PGA gain = 64x and an output word rate of 13 Hz to 60 Hz, the CS5530 achieves better than 0.01 C resolution with proper cold-junction compensation, suitable for laboratory and industrial process control. The on-chip self-calibration cancels PGA offset and drift, eliminating the need for periodic manual nulling. Used with a low-TC precision reference and matched current-source RTD excitation, the CS5530 forms a complete 4-wire RTD measurement sub-system.
Recomendado
Digital Panel Meter / Process Indicator
The CS5530-ISZR's combination of single-channel differential input, integrated PGA, and three-wire SPI/Microwire-compatible serial interface makes it a direct fit for 4.5-digit to 5.5-digit digital panel meters measuring voltage, current, or process signals (0-10 V, 4-20 mA loop, or mV-level transducer outputs). The on-chip digital filtering rejects 50 Hz / 60 Hz line-frequency noise without external filter components, simplifying panel-meter firmware. The self-calibration registers compensate for reference and PGA drift, ensuring display accuracy over the industrial temperature range. Combined with a low-cost MCU for display driving and scaling, the CS5530 enables panel-meter designs with 0.05% FS accuracy at lower BOM cost than dedicated panel-meter ASICs.
Recomendado
Industrial Process Controller Front End
The CS5530-ISZR's high CMRR (>120 dB) and on-chip PGA make it well-suited for industrial process controller front ends measuring low-level analog signals from field-mounted sensors in noisy factory environments. The differential input topology rejects common-mode ground loops between the controller chassis and remote sensor, while the integrated PGA eliminates external instrumentation amplifiers that would otherwise increase BOM cost and PCB area. At output word rates between 7.5 Hz and 60 Hz, the on-chip sinc³ digital filter provides 50 Hz / 60 Hz line-noise rejection without additional analog filtering. Used with a precision reference and proper PCB layout, the CS5530 enables process-controller analog inputs meeting IEC 61000-4 industrial EMC requirements at lower cost than discrete sigma-delta modulator + amplifier designs.
Recomendado
Battery-Powered Portable Instrumentation
The CS5530-ISZR's low-power shutdown mode and 5 V single-supply operation suit battery-powered portable instrumentation such as handheld meters, data loggers, and field-calibration equipment. At low output word rates (7.5 Hz to 60 Hz), the device's supply current is dominated by the analog front-end quiescent draw rather than the modulator clock, and the on-chip PGA eliminates external op-amps that would otherwise increase system current. The integrated calibration registers eliminate periodic field recalibration, reducing field-service cost for multi-thousand-unit deployments. Used with a sleep-mode MCU that wakes the CS5530 via the SPI CS pin between conversions, the part can achieve multi-year battery life on 2x AA cells in low-duty-cycle logging applications.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para CS5530-ISZR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | CS5530-ISZ | CS5530-ASZ | CS5530-ASZR | SIG5530A | LHA7530 |
|---|---|---|---|---|---|---|
| Brand | Cirrus Logic | Cirrus Logic | Cirrus Logic | Cirrus Logic | SIG Microelectronics | LHwise Technology |
| Package | 20-SSOP | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same |
| Resolution | 24 bits | 24 bits | 24 bits | 24 bits | 24 bits | 24 bits |
| Number of Input Channels | 1 differential | 1 differential | 1 differential | 1 differential | 1 differential | 1 differential |
| PGA Gain Range | 1x to 64x | 1x to 64x | 1x to 64x | 1x to 64x | 1x to 64x | 1x to 64x |
| Output Word Rates | 7.5 Hz to 3840 Hz | 7.5 Hz to 3840 Hz | 7.5 Hz to 3840 Hz | 7.5 Hz to 3840 Hz | Compatible with CS5530 rates | Compatible with CS5530 rates |
| On-Chip Calibration | Self + system calibration | Self + system calibration | Self + system calibration | Self + system calibration | Self + system calibration | Self + system calibration |
| Automotive Grade | No (industrial) | No | Yes (automotive) | Yes (automotive) | No | No |
| Lifecycle Status (2026) | NRND | NRND | NRND | NRND | Active (drop-in replacement) | Active (drop-in replacement) |
Diferenciadores clave
- Integrated low-noise chopper-stabilized PGA from 1x to 64x (frente a CS5532-ASZR (family alternative))
- Single-channel CS5530 register set with on-chip calibration (frente a SIG5530A (cross-brand drop-in))
- 20-SSOP footprint with full Cirrus Logic CS55xx family compatibility (frente a LHA7530 (cross-brand drop-in))
Notas de diseño
Use a low-noise LDO such as TPS7A4701 to power the VA+ analog rail. Switching regulators inject switching noise that directly degrades the CS5530's effective resolution; at PGA gain = 64x, the LDO's PSRR at 100 kHz becomes the limiting noise source. Place a 10 uF ceramic + 0.1 uF ceramic + 10 uF tantalum bypass network within 5 mm of the VA+ pin, and isolate VA+ from VD+ with a ferrite bead or separate LDO rail.
Route the differential AIN+/AIN- traces as a guarded pair with the guard trace tied to VA- (analog ground) to reject leakage currents from the PCB surface. Use a 4-layer PCB with a continuous analog-ground plane on layer 2; do not split the ground plane under the CS5530. Keep digital traces (SCLK, SDO, SDI, CS) at least 3 mm away from AIN+/AIN- and REF+/REF- to avoid digital-to-analog coupling. Reference: CS5530 datasheet layout guidelines section.
Do not omit the on-chip calibration sequence at power-up; uncalibrated conversions can show 100 LSB or more of offset and gain error. The CS5530 expects a CS55xx-specific command sequence (system calibration offset and gain) before accurate conversions begin. Also ensure XIN/XOUT is driven by a clean 4.9152 MHz crystal or external clock; ringing or harmonic distortion on the clock directly couples into the sigma-delta modulator and degrades effective resolution. Finally, avoid using the CS5530 at high output word rates (>1 kHz) when gain >16x - modulator saturation can occur with full-scale input signals.
Because the CS5530 is a sigma-delta ADC with sinc³ decimation, the modulator clock is internally divided to derive the output word rate. Any jitter or drift on XIN/RF directly translates into conversion noise; use a crystal of 50 ppm or better initial accuracy and 25 ppm temperature stability. Place the load capacitor values specified in the datasheet exactly on XIN/XOUT (typically 22 pF to 33 pF) - deviations shift the crystal load and degrade noise performance. For high-CMRR applications, ensure REF+/REF- use a low-TC reference such as REF195.
Información de cumplimiento
RoHS compliant per Cirrus Logic product page (-ISZ suffix indicates lead-free). Not AEC-Q100 qualified for automotive - choose CS5530-ASZ/ASZR variant for automotive applications. Part is moving toward end-of-life as of 2026-10-15; design-ins should plan for SIG5530A or LHA7530 cross-brand drop-in replacement.
