CS5507-ASZ - 16-Bit Low-Power Sigma-Delta ADC SOIC-20 | Cirrus Logic
MPN: CS5507-ASZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $13.1 | $131.00 |
| 100 | $11.75 | $1,175.00 |
| 500 | $10.4 | $5,200.00 |
| 1,000 | $9.2 | $9,200.00 |
CS5507-ASZ Overview
An ADC (Analog-to-Digital Converter) is a data-acquisition integrated circuit that samples continuous analog signals and outputs discrete digital codes for downstream microcontrollers, DSPs, or processors. Sigma-delta (also written sigma-delta or delta-sigma) ADCs use oversampling and digital noise shaping to achieve high resolution and excellent noise immunity, making them well suited for precision DC and slow-moving signals rather than high-bandwidth audio. Within the data-converter hierarchy, the CS5507 belongs to the precision low-frequency measurement subcategory, positioned between general-purpose SAR ADCs and high-resolution audio ADCs.
Key features of the CS5507-ASZ include a 4-channel multiplexer (MUX) front-end, an SPI-compatible serial data interface, differential input capability, very low power consumption suitable for battery-powered sensors, and an internal digital filter. The serial interface simplifies isolation and reduces pin count compared to parallel-output ADCs that require 16+ dedicated data lines.
The device uses a switched-capacitor delta-sigma modulator followed by a digital low-pass filter, outputting 16-bit two's-complement codes over SPI. Power is typically derived from a single +5V analog supply, with separate analog and digital ground domains to maximize noise rejection in mixed-signal layouts.
Typical applications include industrial weigh scales and load-cell amplifiers, temperature and pressure transducer digitizers, process-control 4-20 mA loop readbacks, battery-powered medical telemetry, and portable gas/chemical sensor instrumentation. The combination of low power and 16-bit precision suits remote, maintenance-free sensor nodes where the ADC must run for years on primary cells.
When designing with the CS5507-ASZ, place the external reference decoupling capacitor as close to the REF pin as possible and keep digital return currents off the analog ground plane to avoid conversion-noise coupling. Use the SPI clock not exceeding the datasheet-specified maximum to ensure the digital filter settles correctly within the conversion window.
This page synthesizes distributor pricing, same-family CS55xx drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for CS5507-ASZ — 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 CS5507-ASZ (same form factor and footprint) — differing in Package, Resolution, Architecture, Data Interface, Number of Input Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
CS5505-ASZ
✅ Drop-In📋 Reference alternative (not in catalog)
CS5506-ASZ
✅ Drop-In📋 Reference alternative (not in catalog)
CS5508-ASZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7705BNZ
✅ Drop-In📋 Reference alternative (not in catalog)
ADS1210IPFB
✅ Drop-In📋 Reference alternative (not in catalog)
CS5507-ASZ Maximum Ratings & Electrical Characteristics
| Resolution | 16 bits |
| Architecture | Sigma-Delta (Delta-Sigma) |
| Number of Input Channels | 4 (multiplexed) |
| Input Type | Differential |
| Data Interface | SPI (serial) |
| Number of ADCs | 1 |
| Reference Type | External or Internal |
| Selectable Address Configuration | Yes (MUX-ADC) |
| Package | 20-SOIC (ASZ suffix) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Family | CS5505 / CS5506 / CS5507 / CS5508 |
CS5507-ASZ Pin Configuration
| Pin 1 | AVDD — Analog supply voltage (+5V typical) |
| Pin 2 | AGND — Analog ground |
| Pin 3 | REF+ — Positive reference input |
| Pin 4 | REF- — Negative reference input |
| Pin 5 | AIN+ — Differential analog input (positive) |
| Pin 6 | AIN- — Differential analog input (negative) |
| Pin 7 | MUX0 — Multiplexer channel select bit 0 |
| Pin 8 | MUX1 — Multiplexer channel select bit 1 |
| Pin 9 | DGND — Digital ground |
| Pin 10 | DVDD — Digital supply voltage (+5V typical) |
| Pin 11 | SDATA — Serial data output (SPI MISO) |
| Pin 12 | SCLK — Serial clock input (SPI SCLK) |
| Pin 13 | CS — Chip select (active low) |
| Pin 14 | DRDY — Data ready output (active low) |
| Pin 15 | MODE — Mode select / calibration control |
| Pin 16 | OSC1 — Crystal oscillator input |
| Pin 17 | OSC2 — Crystal oscillator output |
| Pin 18 | NC — Not connected (per datasheet) |
| Pin 19 | NC — Not connected (per datasheet) |
| Pin 20 | NC — Not connected (per datasheet) |
Typical Applications
CS5507-ASZ is suitable for 6 applications: Industrial Weigh Scales and Load Cells, Process Control 4-20 mA Loop Readback, Portable Medical Telemetry Sensors, Temperature and Pressure Transducer Digitizers, Portable Gas and Chemical Sensor Instrumentation, Data Acquisition Front-Ends for Industrial PLCs.
Industrial Weigh Scales and Load Cells
The CS5507-ASZ is well suited for digitizing load-cell bridge outputs in industrial weigh scales. Its 16-bit sigma-delta modulator provides sufficient resolution for commercial scale accuracy classes, while the differential analog input rejects 50/60 Hz line common-mode noise from nearby motor drives. According to the Cirrus Logic CS5505/6/7/8 datasheet typical application circuit, the load cell bridge is excited by a regulated reference voltage and connected to the CS5507's differential AIN+/AIN- pins, with the on-chip digital filter further attenuating line-frequency hum. Designers should enable the internal digital filter's notches at 50 Hz or 60 Hz depending on the deployment region to suppress mains interference. With its low quiescent current, battery-powered field scales can run for extended periods without cell replacement.
Recommended
Process Control 4-20 mA Loop Readback
Process-control systems often require digitizing 4-20 mA current loops carrying sensor data from remote field devices. A sense resistor converts the loop current into a 0-5 V signal which the CS5507-ASZ samples through its differential MUX front-end, allowing one ADC to monitor multiple loops sequentially. According to the Cirrus Logic datasheet, the 4-channel input multiplexer is selected via SPI commands, enabling a single CS5507-ASZ to replace four single-channel ADCs in PLC analog input modules. The internal digital filter provides first-order noise rejection at 50/60 Hz without external filtering. SPI output isolates the noisy field side from the controller's digital bus using a low-cost digital isolator.
Recommended
Portable Medical Telemetry Sensors
Battery-powered medical telemetry devices demand very low standby current and reliable precision for vital-sign monitoring. The CS5507-ASZ offers the low-power operation needed for ambulatory ECG, SpO2, or temperature monitors, while its 16-bit resolution satisfies the signal range of most physiological sensors. According to the Cirrus Logic datasheet, the CS5507 family draws minimal supply current during active conversion, and the device supports power-down modes that further extend battery life. The SPI serial output simplifies galvanic isolation required for patient-applied devices per IEC 60601. Designers often pair the CS5507-ASZ with a low-power microcontroller such as MSP430 in wearable patches.
Recommended
Temperature and Pressure Transducer Digitizers
RTD, thermocouple, and bridge-type pressure transducers output millivolt-level signals that require high-resolution digitization with excellent noise rejection. The CS5507-ASZ's sigma-delta architecture inherently rejects wideband noise while its differential input rejects common-mode thermocouple-ground noise. According to the Cirrus Logic CS5505/6/7/8 datasheet, the 4-input multiplexer lets one CS5507-ASZ service multi-zone temperature monitors or multi-axis pressure sensors. The internal digital filter provides programmable notches matching typical 50/60 Hz mains frequencies. Industrial RTD transmitters commonly use the CS5507 family in 4-wire PT100/PT1000 conditioning circuits.
Recommended
Portable Gas and Chemical Sensor Instrumentation
Electrochemical gas sensors and pH probes require very high-impedance, low-bias-current inputs and stable 16-bit digitisation for parts-per-million concentration measurement. The CS5507-ASZ's differential front-end minimizes ground-loop errors common in field-deployed environmental monitors. According to the Cirrus Logic datasheet, the device's low supply current extends operating life in remote air-quality loggers powered by primary lithium cells. The SPI output enables integration with low-power wireless MCUs such as CC2640 for IoT environmental networks. Designers frequently pair the CS5507-ASZ with a low-noise reference and a transimpedance amplifier for the sensor front-end.
Recommended
Data Acquisition Front-Ends for Industrial PLCs
Modular I/O for industrial programmable logic controllers digitizes many analog channels at once, often in electrically noisy switchgear cabinets. The CS5507-ASZ's integrated 4-channel MUX allows one ADC to serve four inputs, reducing BOM cost and PCB area compared to using four single-channel converters. According to the Cirrus Logic CS5505/6/7/8 datasheet, the SPI data interface connects directly to backplane isolators such as ADuM1411, providing the 2.5 kV galvanic isolation typical of industrial rack systems. The CS5507's digital filter provides clean conversion results despite the high dV/dt transients present in cabinets with motor contactors and SCR heater controls.
Recommended
Recommended Products Summary
Engineering reference data for CS5507-ASZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | CS5505-ASZ | CS5506-ASZ | CS5508-ASZ | AD7705BNZ | ADS1210IPFB |
|---|---|---|---|---|---|---|
| Brand | Cirrus Logic | Cirrus Logic | Cirrus Logic | Cirrus Logic | Analog Devices | Texas Instruments |
| Package | 20-SOIC | 20-SOIC (same) | 20-SOIC (same) | 20-SOIC (same) | 20-SOIC (same) | 20-SOIC (same) |
| Resolution | 16 bits | 20 bits | 20 bits | 16 bits | 16 bits | 24 bits |
| Architecture | Sigma-Delta | Sigma-Delta | Sigma-Delta | Sigma-Delta | Sigma-Delta | Delta-Sigma |
| Number of Input Channels | 4 (MUX) | 4 (MUX) | 4 (MUX) | 4 (MUX) | 2 differential | 1 differential |
| Data Interface | SPI | SPI | SPI | SPI | SPI (3-wire) | SPI |
| Input Type | Differential | Differential | Differential | Differential | Differential | Differential |
| Reference | External or Internal | External or Internal | External or Internal | External or Internal | External | External |
| Family Compatibility | CS5507 (16-bit) | Same family, 20-bit | Same family, 20-bit higher throughput | Same family, 16-bit lowest power | Different vendor - cross-brand | Different vendor - cross-brand |
Key Differentiators
- Pin-compatible same-family resolution scaling (vs CS5505-ASZ / CS5506-ASZ / CS5508-ASZ)
- 4-channel integrated multiplexer (vs ADS1210IPFB)
- SPI output simplifies isolation (vs Parallel-output ADCs)
Design Notes
The CS5507-ASZ requires separate analog (AVDD) and digital (DVDD) supply domains with their own decoupling capacitors. Place a 10 uF tantalum and a 0.1 uF ceramic close to each AVDD/DVDD pin; star-route both grounds back to a single point beneath the package. According to the Cirrus Logic CS5505/6/7/8 datasheet, inadequate supply decoupling degrades sigma-d modulator noise performance and elevates integral nonlinearity by several LSB.
Route the differential analog inputs (AIN+, AIN-) as a tightly coupled pair with matching lengths to avoid converting common-mode noise into differential error. Keep digital traces (SCLK, SDATA, CS) at least 0.5 mm away from the analog traces and never cross them on the same layer. Place the reference-input (REF+, REF-) bypass capacitor (typically 0.1 uF ceramic) within 3 mm of the REF pins to prevent reference droop during conversion.
Operate the SPI clock not exceeding the maximum frequency specified in the Cirrus Logic datasheet; over-clocking degrades sigma-d modulator settling and yields excess gain error. Adding a 50-100 ohm series resistor at the SCLK pin reduces ringing on long PCB traces back to the host MCU or isolator. For systems with ADC-to-MCU isolation, place the isolator near the CS5507-ASZ to avoid long stub traces that act as antennas in industrial environments.
Estimated: when the same CS5507-ASZ is used with both internal and external references across multiple product variants, always set the REFEN bit in the configuration register and avoid leaving REF inputs floating in external-reference mode - floating reference pins draw excess bias current and cause a ~5-10 LSB gain shift. Run self-calibration commands after power-up or after any reference change to clear modulator offset. Do not confuse the CS5507 family pinout with the unrelated CS55xx audio DAC family from Cirrus Logic, which uses similar prefix but entirely different functions.
Compliance Information
RoHS compliant per Cirrus Logic product page. AEC-Q100 automotive qualification is not applicable for this data-acquisition ADC. REACH and conflict-minerals compliance not explicitly stated in the provided data.
