CS5533-ASZ - 16-Bit 4-Ch Sigma-Delta ADC with PGIA | Cirrus Logic
MPN： CS5533-ASZ ✓ 啟用中CS5533-ASZ 概覽
A sigma-delta ADC is a type of analog-to-digital converter that oversamples the input signal and applies digital decimation filtering to achieve very high resolution at low-to-moderate bandwidths. Within the data-conversion hierarchy, it sits under ADCs, then data acquisition ICs, then analog mixed-signal semiconductors. Sigma-delta converters excel where precision matters more than speed, such as weighing scales, temperature measurement and process-control front ends.
Key features of the CS5533-ASZ include the 16-bit delta-sigma modulator, four differential input channels multiplexed into one converter, and a chopper-stabilized instrumentation amplifier with only 6 nV/sqrt(Hz) noise density at 0.1 Hz. This extremely low flicker-noise corner is the defining strength of the CS553x family, enabling direct connection of low-level bridge and thermocouple signals without external precision amplifiers.
Architecturally, each conversion path flows through the multiplexed PGIA, a fourth-order delta-sigma modulator, and a linear-phase digital filter. The chopper-stabilized amplifier suppresses 1/f noise and offset drift, which are normally the dominant error sources in DC-precision designs. Serial SPI-compatible control allows gain, channel, and output-word-rate configuration, and self-calibration routines correct offset and gain errors in system.
Typical applications include industrial weigh-scale/load-cell front ends, temperature measurement via thermocouples and RTDs, and battery-test or process-control data acquisition systems. The four multiplexed channels let one ADC serve multiple sensors, cutting cost and board area in multi-channel instruments.
A key design consideration: the PGIA gain and output word rate trade against effective resolution; per the manufacturer product family page, noise performance must be evaluated at the selected gain and data rate, not at the headline value.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 CS5533-ASZ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： CS5533-ASZ （相同外形與佔位） — 差異在於 Number of Input Channels, Interface, Package, Calibration, Analog Supply Voltage.
CS5533-BSZ
✅ 直接替換📋 參考替代品（不在目錄中）
CS5534-ASZR
✅ 直接替換聯絡詢價
查看資料表 →CS5534-BSZ
✅ 直接替換聯絡詢價
查看資料表 →CS5534-ASZR
✅ 直接替換聯絡詢價
查看資料表 →CS5532-BSZ
✅ 直接替換聯絡詢價
查看資料表 →CS5532-ASZ
✅ 直接替換聯絡詢價
查看資料表 →CS5533-ASZ 最大額定值與電氣特性
| 解析度 | 16 bit |
| Number of Input Channels | 4 (differential, multiplexed) |
| Converter Type | Sigma-Delta (delta-sigma) |
| Integrated Amplifier | Ultra-low-noise PGIA (chopper-stabilized) |
| PGIA Gain Settings | 1x, 2x, 4x, 8x, 16x, 32x, 64x |
| Amplifier Input Noise | 6 nV/sqrt(Hz) at 0.1 Hz |
| 供應電壓 | +5 V single supply, or +/-2.5 V / +/-3 V dual supply |
| 封裝 | 24-SSOP |
| 安裝類型 | Surface Mount |
| 介面 | Serial (SPI-compatible) |
| Product Family | CS5531/CS5532/CS5533/CS5534 |
CS5533-ASZ 24-ssop 腳位配置指南
CS5533-ASZ（24-ssop 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： CS5533-ASZ.
請參閱 資料表 以查看完整腳位配置。
典型應用
CS5533-ASZ 適用於 6 應用s: Weigh Scale / Load Cell Front End, Thermocouple Temperature Measurement, RTD and Precision Process Sensing, Battery Test and Formation Systems, Industrial Data Acquisition / PLC Analog Input, Medical Instrumentation Signal Acquisition.
Weigh Scale / Load Cell Front End
The CS5533-ASZ fits weigh-scale designs because its chopper-stabilized PGIA provides 6 nV/sqrt(Hz) noise at 0.1 Hz with gains up to 64x, allowing direct connection of a few-mV full-scale load-cell bridge without an external precision amplifier. The sigma-delta converter's linear-phase digital filter attenuates 50/60 Hz mains interference that dominates scale installations, and self-calibration removes offset and gain drift over temperature. In a typical circuit the bridge excitation drives the ADC reference for ratiometric operation, cancelling excitation drift. The trade-off versus a 24-bit CS5534 is lower noise-free resolution, adequate for most commercial and industrial scale accuracy classes.
推薦
Thermocouple Temperature Measurement
The CS5533-ASZ suits thermocouple acquisition because type J/K/T thermocouples produce tens of microvolts per degree C, and the PGIA's 6 nV/sqrt(Hz) input noise at 0.1 Hz keeps quantization and amplifier noise below one measurement LSB at moderate gain settings. The +/-2.5 V or +/-3 V dual-supply mode accommodates bipolar input signals around ground, simplifying cold-junction offset handling. Four multiplexed differential channels let one CS5533-ASZ scan multiple thermocouples plus an ambient reference channel, reducing BOM cost in multi-point monitoring. Chopper stabilization eliminates 1/f noise and offset drift, the dominant errors in DC-coupled thermocouple systems.
推薦
RTD and Precision Process Sensing
For RTD measurement the CS5533-ASZ pairs naturally with ratiometric excitation: a single current or voltage source drives both the RTD and the ADC reference, so reference drift cancels in the digital result. The PGIA's selectable gains (1x to 64x) match the small voltage change per degree across a 100-ohm platinum element, and the chopper-stabilized input stage suppresses thermal EMF errors at connector junctions. In process-control front ends the 16-bit resolution with self-calibration supports typical 0.1% loop accuracy. Linear-phase digital filtering preserves waveform shape for transient events while rejecting mains interference at 50 and 60 Hz.
推薦
Battery Test and Formation Systems
Battery testers require microvolt-level voltage measurement across cells while handling common-mode voltages, and the CS5533-ASZ addresses this with its differential PGIA inputs, 64x maximum gain, and 16-bit resolution with self-calibration to remove drift between test cycles. The four multiplexed differential channels allow sequential monitoring of multiple cell taps or sense points with one converter, cutting channel cost in multi-cell fixtures. The sigma-delta oversampling architecture averages charge-injection and noise over the conversion window, improving repeatability in long-duration charge/discharge integration tests. Chopper stabilization keeps offset stable over the minutes-to-hours timescales of formation cycling.
推薦
Industrial Data Acquisition / PLC Analog Input
The CS5533-ASZ works as a compact multi-channel analog front end for PLC and DAQ modules: four differential inputs with software-selectable gains let one IC condition 4-20 mA shunt signals, bridge sensors, and low-level thermocouples alike. The serial SPI-compatible interface integrates with any MCU, and register-configurable output word rates trade speed against resolution to match each channel's needs. Its +5 V single-supply mode simplifies the industrial 5 V power tree. Compared with discrete PGA-plus-ADC solutions, the integrated chopper-stabilized PGIA removes inter-component offset errors and saves board area in dense I/O cards.
推薦
Medical Instrumentation Signal Acquisition
Low-level biopotential and physiological sensor signals benefit from the CS5533-ASZ's 6 nV/sqrt(Hz) chopper-stabilized amplifier, which keeps input-referred noise far below typical sensor signal levels over the DC-to-low-frequency band of interest. Gains from 1x to 64x allow front-end scaling for bridge-based pressure sensors, and the linear-phase digital filter avoids waveform distortion in measured physiological transients. Multiplexed differential channels support multi-sensor patient or laboratory instruments with a single converter, while self-calibration maintains DC accuracy without manual trimming. Designers must observe the applicable medical electrical safety standards for patient-connected circuits in the surrounding system.
推薦
推薦產品摘要
工程參考資料，適用於 CS5533-ASZ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | CS5533-BSZ | CS5534-ASZ | CS5534-BSZ | CS5532-BSZ |
|---|---|---|---|---|---|
| Package | 24-SSOP | 24-SSOP - same | 24-SSOP - same | 24-SSOP - same | 24-SSOP - same |
| Brand | Cirrus Logic | Cirrus Logic | Cirrus Logic | Cirrus Logic | Cirrus Logic |
| Input Channels | 4 differential | 4 differential | 4 differential | 4 differential | 2 differential |
| PGIA Gain Range | 1x to 64x | 1x to 64x | 1x to 64x | 1x to 64x | 1x to 64x |
| Amplifier Noise | 6 nV/sqrt(Hz) at 0.1 Hz | 6 nV/sqrt(Hz) at 0.1 Hz | 6 nV/sqrt(Hz) at 0.1 Hz | 6 nV/sqrt(Hz) at 0.1 Hz | 6 nV/sqrt(Hz) at 0.1 Hz |
| Supply Voltage | +5 V or +/-2.5 V / +/-3 V | +5 V or +/-2.5 V / +/-3 V | +5 V or +/-2.5 V / +/-3 V | +5 V or +/-2.5 V / +/-3 V | +5 V or +/-2.5 V / +/-3 V |
主要差異化特點
- Ultra-low 1/f noise corner from chopper-stabilized PGIA (對比CS5532-BSZ)
- Cost-optimized 16-bit resolution (對比CS5534-ASZ)
- Family-based second sourcing with zero hardware change (對比CS5534-BSZ)
設計說明
Treat the analog input section as a low-level differential domain. Route AIN pairs as tightly coupled traces away from the SCLK/SDI/SDO serial bus, and use a solid analog ground plane under the converter. Place 100 nF ceramic decoupling capacitors directly at the supply, reference, and PGIA input pins, with bulk capacitance near the part. Per the Cirrus Logic CS5531/32/33/34 family documentation, the chopper-stabilized amplifier achieves 6 nV/sqrt(Hz) at 0.1 Hz only when supply and reference noise are kept low.
Power the CS5533-ASZ from a quiet linear or well-post-regulated rail. A switching converter placed upstream without adequate LC filtering will couple ripple into the PGIA through supply rejection limits and raise the noise floor well above the datasheet characteristic. If a single +5 V rail is used, remember dual-supply mode (+/-2.5 V or +/-3 V) is available when bipolar sensor signals must swing around ground. Estimated: a series ferrite plus 10 uF/100 nF decoupling typically provides sufficient broadband isolation for this converter class.
Do not evaluate resolution at the headline 16-bit figure alone: effective noise-free resolution depends on the selected PGIA gain and output word rate, per the manufacturer family documentation. Also confirm the exact temperature-grade suffix when sourcing - CS5533-ASZ and CS5533-BSZ share the same die but differ in grade, and distributors list both. Finally, remember no cross-brand pin-to-pin replacement exists; the TI ADS1248 requires firmware and PCB changes, so second-source strategy should rely on CS5534/CS5532 family members.
合規資訊
Compliance data was not present in the provided web data. Consult the Cirrus Logic product page or distributor environmental listings for RoHS/REACH status.
