CS5533-ASZR - 16-Bit Sigma-Delta ADC 4-Ch PGIA | Cirrus Logic
MPN: CS5533-ASZR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.52 | $4.52 |
| 10 | $4.25 | $42.50 |
| 100 | $3.93 | $393.00 |
| 500 | $3.72 | $1,860.00 |
| 1,000 | $3.55 | $3,550.00 |
CS5533-ASZR Overview
A sigma-delta ADC is a type of analog-to-digital converter that oversamples the input signal and uses charge-balance (delta-sigma) modulation followed by digital decimation filtering to achieve very high resolution at low-to-moderate speeds. Within the data-acquisition signal chain hierarchy, it sits between front-end sensors and a digital processor, converting low-level unipolar or bipolar signals into serial digital words. The CS5533 belongs to the broader class of precision ADCs and power-management-adjacent mixed-signal ICs used in measurement systems.
Key features of the CS5533-ASZR include 16-bit resolution achieved through charge-balance delta-sigma techniques, four differential multiplexed input channels, and an integrated ultra-low-noise PGIA that allows direct connection of low-level bridge and thermocouple signals without a separate instrumentation amplifier. The analog supply operates from 4.75V to 5.25V, supporting +5V single-supply or +/-2.5V / +/-3V dual-supply operation per distributor application documentation. Data is returned over a simple serial (SPI-compatible) interface, simplifying isolation barriers in industrial designs.
Architecturally, the device pairs the delta-sigma modulator with on-chip digital filtering and a self-calibration system, so gain and offset errors can be trimmed in-circuit. The A-grade temperature range of -40C to +85C suits industrial environments, and the 'R' suffix indicates tape-and-reel packaging for automated assembly.
Typical applications include weigh-scale load-cell measurement, process-control transmitters, and scientific or medical instrumentation, all domains the CS5531/32/33/34 family was explicitly optimized for by Cirrus Logic.
For design, keep the analog ground plane clean and use a low-noise reference; the PGIA gain setting trades noise floor against input range, so select gain per sensor full-scale output.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for CS5533-ASZR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with CS5533-ASZR (same form factor and footprint) — differing in Number of Input Channels, Package, Input Type, Interface, Analog Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
CS5534-ASZR
✅ Drop-In✓ In Stock
$3.55 / Unit
View Datasheet →CS5534-BSZR
✅ Drop-In✓ In Stock
$8.5 / Unit
View Datasheet →CS5533-ASZ
✅ Drop-In✓ In Stock
$2.25 / Unit
View Datasheet →CS5531-ASZ
✅ Drop-In✓ In Stock
$3.98 / Unit
View Datasheet →CS5533-ASZR Maximum Ratings & Electrical Characteristics
| Resolution | 16 bit |
| Number of Input Channels | 4 differential (multiplexed) |
| Architecture | Sigma-Delta (charge-balance) |
| Sampling Rate | 3.84 kSPS |
| Analog Supply Voltage | 4.75 V to 5.25 V |
| Input Type | Differential |
| Programmable Gain Amplifier | Yes (ultra-low-noise PGIA) |
| Data Interface | Serial (SPI-compatible) |
| Supply Modes | +5V single supply or +/-2.5V / +/-3V dual supply |
| Operating Temperature Range | -40C to +85C (A grade) |
| Package | 24-SSOP |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (R suffix) |
| Application Optimization | Weigh scale, process control, scientific, medical |
| Calibration | Self-calibration (gain and offset) |
CS5533-ASZR 24-ssop Pin Configuration Guide
Pin configuration for CS5533-ASZR (24-ssop package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for CS5533-ASZR.
Refer to the datasheet for full pin configuration.
Typical Applications
CS5533-ASZR is suitable for 6 applications: Weigh Scale and Load Cell Measurement, Industrial Process Control Transmitters, Medical and Diagnostic Instrumentation, Scientific and Laboratory Measurement, Temperature Measurement via Thermocouples and RTDs, Multi-Channel Data Acquisition Systems.
Weigh Scale and Load Cell Measurement
The CS5533-ASZR is explicitly optimized by Cirrus Logic for weigh scale applications, where low-level load-cell bridge outputs must be digitized with minimal noise. Its integrated ultra-low-noise PGIA amplifies millivolt-level bridge signals directly, eliminating a discrete instrumentation amplifier and its associated offset and drift errors. The 16-bit charge-balance sigma-delta converter with self-calibration trims gain and offset in-circuit, maintaining accuracy over temperature in the -40C to +85C A-grade range. At a 3.84 kSPS maximum output rate, it supports high-speed checkweighers as well as standard retail scales. The four multiplexed differential channels allow a single device to scan multiple load cells in multi-platform weighing systems. Use a stable low-noise voltage reference for the bridge excitation, and select the PGIA gain so the sensor full-scale output matches the converter input range for the best signal-to-noise ratio.
Recommended
Industrial Process Control Transmitters
In 4-20 mA loop-powered and field-mounted process transmitters, the CS5533-ASZR digitizes low-level sensor signals from pressure, temperature and flow elements. The 4.75V to 5.25V analog supply supports +5V single-supply operation, simplifying the power budget of loop-powered designs, while +/-2.5V or +/-3V dual-supply modes accommodate bipolar sensor outputs. The SPI-compatible serial interface makes it straightforward to place the ADC on the isolated side of a digital isolator barrier. The self-calibration capability compensates gain and offset drift encountered across the industrial -40C to +85C temperature range, reducing the need for periodic field recalibration. Because the PGIA gain is programmable, one transmitter hardware platform can accept multiple sensor types by changing gain settings in firmware. The 24-SSOP surface-mount package supports compact, conformally coated transmitter boards.
Recommended
Medical and Diagnostic Instrumentation
Cirrus Logic lists medical applications as a target market for the CS5531/32/33/34 family, and the CS5533-ASZR fits patient-connected and benchtop diagnostic equipment where small biosignals must be measured cleanly. The ultra-low-noise PGIA directly conditions millivolt-level signals from bridge, thermal or electrode front ends without adding discrete amplifier noise. Sigma-delta conversion with digital decimation filtering provides excellent linearity and low drift, which matters for long-term monitoring accuracy. Four differential input channels allow simultaneous multiplexed acquisition of multiple physiological or diagnostic channels with one converter, lowering cost and board area. The +5V or +/-2.5V supply options integrate into medically compliant isolated power architectures, and the SPI interface connects cleanly across isolation barriers. Self-calibration maintains measurement integrity between service intervals in clinical environments.
Recommended
Scientific and Laboratory Measurement
For scientific instrumentation such as benchtop data loggers, spectrometer front ends and sensor research rigs, the CS5533-ASZR offers a straightforward precision acquisition core. The charge-balance sigma-delta architecture produces repeatable 16-bit results at conversion rates up to 3.84 kSPS, which covers most quasi-static laboratory phenomena. The programmable gain instrumentation amplifier lets researchers match a wide variety of transducer sensitivities without redesigning analog gain stages, and self-calibration supports traceable measurement practice. The four multiplexed differential inputs reject common-mode noise from laboratory power supplies and cabling, which is often the dominant error source in bench setups. Operating from a single +5V rail or +/-3V dual rails, the device slots into both battery-powered field instruments and mains-powered lab equipment. The standard SPI interface works with any microcontroller or FPGA evaluation platform.
Recommended
Temperature Measurement via Thermocouples and RTDs
Thermocouple signals are inherently small (microvolts to tens of millivolts) and demand a low-noise analog front end, which the CS5533-ASZR provides through its integrated PGIA. Direct connection of thermocouples to the differential inputs, with the appropriate gain setting, yields usable resolution without a separate amplifier stage. For RTD measurement, the differential inputs digitize the voltage across the sensing element in a ratiometric configuration referenced to the excitation current source, cancelling reference drift to first order. Self-calibration removes residual offset from cold-junction compensation circuitry and PCB thermoelectric effects. The 3.84 kSPS rate far exceeds typical thermal time constants, allowing heavy oversampling and digital averaging for sub-0.1C effective resolution. The A-grade -40C to +85C operating range matches the environments in which the measured process itself operates.
Recommended
Multi-Channel Data Acquisition Systems
The CS5533-ASZR consolidates four differential sensor channels behind one 16-bit sigma-delta converter, making it a compact core for multiplexed data acquisition systems. Its on-chip multiplexer and PGIA eliminate external analog switching for many designs, reducing component count, board area and the calibration burden of discrete signal chains. The SPI-compatible serial interface is supported natively by common microcontrollers and can be optically or galvanically isolated with minimal signal lines in industrial installations. With a 3.84 kSPS aggregate ceiling, the device suits scanning rates of hundreds of samples per second per channel across all four inputs - adequate for most process and structural monitoring. Systems requiring additional resolution can migrate to the pin-compatible 24-bit CS5534 without a PCB respin, protecting the hardware investment across product tiers.
Recommended
Recommended Products Summary
Engineering reference data for CS5533-ASZR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | CS5534-ASZR | CS5534-BSZR | CS5533-ASZ | CS5531-ASZ |
|---|---|---|---|---|---|
| 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 |
| Resolution | 16 bit | 24 bit | 24 bit | 16 bit | 16 bit |
| Input Channels | 4 differential | 4 differential | 4 differential | 4 differential | 2 differential |
| Sampling Rate | 3.84 kSPS | 3.84 kSPS | 3.84 kSPS | 3.84 kSPS | 3.84 kSPS |
| PGIA | Yes (ultra-low-noise) | Yes | Yes | Yes | Yes |
| Analog Supply | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V |
| Grade / Packaging | A grade, Tape & Reel | A grade, Tape & Reel | B grade, Tape & Reel | A grade, Tube | A grade, Tube |
Key Differentiators
- Lower cost at equal channel count than the 24-bit sibling (vs CS5534-ASZR)
- Four channels vs two in the low-cost family member (vs CS5531-ASZ)
- Trade-off: lower dynamic range than the 24-bit variant (vs CS5534-BSZR)
Design Notes
Keep the CS5533-ASZR analog supply within the 4.75V to 5.25V window and decouple VA+ with a 0.1uF ceramic placed within a few millimeters of the supply pin, plus a bulk 10uF per power domain. Separate the analog ground from the digital return of the SPI interface, joining them at a single star point to prevent digital return currents from modulating the analog ground. Route the four differential input pairs as tightly coupled, shielded traces away from clock lines; the PGIA input is low-noise but high-impedance and will pick up digital coupling if guarding is neglected.
The ultra-low-noise PGIA rewards a clean reference: reference noise appears directly in the output code, so use a precision low-noise reference and decouple the reference input locally. For weigh-scale and thermocouple inputs, apply ratiometric wiring where possible so reference drift cancels. Set the PGIA gain so the largest expected sensor full-scale signal uses most of the converter input range - running at excessive gain clips headroom, while too little gain wastes effective resolution. Exploit the 3.84 kSPS rate with digital averaging to gain additional noise-free bits.
Run the power-on self-calibration (offset and gain) after the reference and analog supplies have fully settled; calibrating too early locks in a settling error. In dual-supply (+/-2.5V or +/-3V) configurations, respect the supply sequencing and do not drive analog inputs beyond the rails before supplies are up - input protection currents can corrupt calibration. Note that the CS5533 (16-bit) and CS5534 (24-bit) are pin-compatible but not code-compatible at the noise floor: firmware noise budgets written for the 16-bit part will be overly conservative on the 24-bit part and vice versa.
Compliance Information
RoHS/REACH status not explicitly stated in the retrieved distributor data; verify on the Cirrus Logic product page or via distributor compliance certificates. The 'Z' suffix on Cirrus Logic parts conventionally indicates lead-free/RoHS-compliant packaging, but this must be confirmed before regulatory use.
