CS5505-ASZR - 16-Bit 4-Ch Sigma-Delta ADC | Cirrus Logic
部品番号: CS5505-ASZR ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $10.61 | $10.61 |
| 10 | $9.55 | $95.50 |
| 100 | $8.49 | $849.00 |
| 500 | $7.43 | $3,715.00 |
| 1,000 | $6.37 | $6,370.00 |
CS5505-ASZR 概要
What is a Sigma-Delta ADC? A Sigma-Delta (Σ-Δ) ADC is a converter architecture that oversamples the input signal and uses noise shaping to push quantization noise out of the baseband. The result is high resolution and excellent noise immunity at the cost of input bandwidth, which is why Σ-Δ converters like the CS5505-ASZR are categorized as data-acquisition ADCs sitting beneath the hierarchy of ADC → data converter → signal chain IC → semiconductor. They are the standard choice for precision sensor readout, weighing scales, strain gauges, thermistor bridges, and process-control loops where signals are sub-kHz and resolution dominates over speed.
Key features of the CS5505-ASZR include 16-bit resolution, 4 input channels multiplexed to a single Σ-Δ core, low power consumption suitable for battery-powered instrumentation, on-chip digital filtering, and an SPI/serial-compatible interface. The -ASZ suffix denotes the 24-SSOP industrial temperature grade, and the -R suffix indicates tape-and-reel packaging, allowing direct compatibility with high-volume automated assembly.
Architecturally, the CS5505 uses a switched-capacitor modulator followed by a digital decimation filter, enabling high effective resolution at low update rates. The 4-to-1 input mux allows the designer to rotate among four sensors using one converter, lowering BOM cost in multi-channel systems. Synchronization is handled by a dedicated calibration and control register set.
Typical applications include industrial weighing scales, pressure transducers, temperature measurement systems with RTD or thermocouple front ends, and portable medical instruments such as glucose or blood-pressure monitors. Wherever a low-frequency, high-resolution, multi-channel readout is needed, the CS5505-ASZR provides a single-chip solution.
When designing with this device, route analog and digital grounds as separate nets joined only at the ADC's AGND pin, and decouple AVDD and DVDD with 0.1 µF ceramic capacitors placed within 5 mm of the supply pins. This page synthesizes distributor pricing, drop-in alternatives from the same family, and practical design notes not found in the manufacturer datasheet alone.
ドロップイン代替品: CS5505-ASZR — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: CS5505-ASZR （同一形状・フットプリント） — 相違点: Data Interface, Number of Input Channels, Package.
クイック比較ツール — 並列比較する代替部品を選択:
CS5506-ASZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
CS5507-ASZ
✅ ドロップイン✓ 在庫あり
$9.2 / 個
データシートを見る →CS5508-ASZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
CS5505-ASZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
CS5505-ASZR 最大定格＆電気的特性
| 分解能 | 16 bits |
| Number of Input Channels | 4 (single-ended/differential via mux) |
| Converter Architecture | Sigma-Delta (Σ-Δ) |
| Number of Converters | 1 (single core with 4:1 mux) |
| パッケージ | 24-SSOP (ASZ suffix) |
| Packaging Style | Tape and Reel (R suffix) |
| Supply Type | Single (Analog + Digital) |
| Data Interface | Serial (SPI-compatible) |
| Input Signal Type | Differential, Single-Ended |
| Architecture Family | CS5505/6/7/8 low-power CMOS ADC family |
| Polarity | Unipolar / Bipolar (input-rail dependent) |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant |
| Lead-Free | Yes |
| Distributor Price (qty 1) | 10.61 USD (as of 2026-10-13) |
CS5505-ASZR ピン構成
| ピン 1 | AVDD — Analog supply voltage |
| ピン 2 | AGND — Analog ground |
| ピン 3 | AIN1+ — Differential analog input 1, positive |
| ピン 4 | AIN1- — Differential analog input 1, negative |
| ピン 5 | AIN2+ — Differential analog input 2, positive |
| ピン 6 | AIN2- — Differential analog input 2, negative |
| ピン 7 | AIN3+ — Differential analog input 3, positive |
| ピン 8 | AIN3- — Differential analog input 3, negative |
| ピン 9 | AIN4+ — Differential analog input 4, positive |
| ピン 10 | AIN4- — Differential analog input 4, negative |
| ピン 11 | REFOUT — Internal reference output |
| ピン 12 | REFIN — Reference input |
| ピン 13 | AGND — Analog ground |
| ピン 14 | DVDD — Digital supply voltage |
| ピン 15 | DGND — Digital ground |
| ピン 16 | CS — Chip select (active low) |
| ピン 17 | SCLK — Serial clock input |
| ピン 18 | SDO — Serial data output |
| ピン 19 | SDI — Serial data input |
| ピン 20 | DRDY — Data ready output |
| ピン 21 | OSCIN — Oscillator input |
| ピン 22 | OSCOUT — Oscillator output |
| ピン 23 | TEST — Test mode pin |
| ピン 24 | RST — Reset (active low) |
主な用途
CS5505-ASZR の用途: 6 件s: Industrial Weighing Scales, Pressure Transducer Readout, Portable Medical Instruments, Temperature Measurement Systems, Process Control Instrumentation, Data Acquisition Front End.
Industrial Weighing Scales
The CS5505-ASZR is well suited to load-cell-based weighing scale designs thanks to its 16-bit resolution, 4-channel differential input mux, and very low power dissipation. A typical application bridges four strain-gauge load cells to the 4:1 mux and digitizes weight at 10 Hz–60 Hz update rates, sufficient for stable scale readings. According to the Cirrus Logic CS5505 datasheet, the on-chip digital filter simplifies the analog front end and reduces the need for external anti-aliasing components. Unlike higher-speed SAR ADCs, the Σ-Δ architecture provides excellent noise rejection at 50/60 Hz mains frequencies, which is critical in factory environments with significant EMI.
おすすめ
Pressure Transducer Readout
The CS5505-ASZR's 4-channel mux and 16-bit Sigma-Delta core make it ideal for multi-port pressure transducer modules used in HVAC, hydraulics, and process-control systems. Engineers typically connect up to four bridge-type pressure sensors to the differential input pairs and sequence the mux to read each port in turn. The CS5505 datasheet specifies very low integral nonlinearity, which is essential for accurate PSI-to-digital conversion. Compared to a 12-bit SAR ADC, the CS5505-ASZR's 16-bit Σ-Δ architecture delivers 16x more code width, enabling sub-Pascal pressure resolution when paired with a low-noise front-end amplifier.
おすすめ
Portable Medical Instruments
Battery-powered medical devices such as glucose meters, blood-pressure cuffs, and pulse oximeters benefit from the CS5505-ASZR's very low power consumption and 16-bit resolution. The CS5505 family was designed specifically for low-frequency biological signal acquisition where signal bandwidth is below 1 kHz. The 24-SSOP package is small enough for handheld enclosures, and the tape-and-reel (-R) format supports high-volume medical device manufacturing. According to Cirrus Logic documentation, the part's on-chip digital filter simplifies signal conditioning for sensors whose output is sub-Hz, while the low quiescent current extends battery life in always-on monitoring devices.
おすすめ
Temperature Measurement Systems
The CS5505-ASZR digitizes RTD, thermistor, and thermocouple bridge outputs in multi-zone temperature monitoring systems, where four differential input channels map to four sensor zones. The Σ-Δ architecture's built-in digital filter attenuates 50/60 Hz line-frequency noise, which dominates measurement error in unshielded industrial environments. The CS5505 datasheet confirms the part supports both unipolar and bipolar input signals, allowing the same ADC to read both single-ended thermistor dividers and bipolar thermocouple junctions. Compared with a discrete 12-bit successive-approximation ADC solution, the CS5505-ASZR simplifies the analog signal chain and reduces PCB area.
おすすめ
Process Control Instrumentation
In distributed control systems (DCS) and SCADA remote terminal units (RTUs), the CS5505-ASZR provides 4-channel, 16-bit digitization of 4–20 mA current-loop and 0–10 V voltage signals from field sensors. The differential input pairs allow direct connection to isolated sensor front ends with common-mode voltages up to the supply rails. The CS5505 datasheet describes synchronization features that allow multiple CS5505-ASZ devices to share a serial bus, simplifying multi-channel field wiring. The 24-SSOP industrial temperature range (-40C to +85C) supports deployment in unconditioned control cabinets and outdoor enclosures.
おすすめ
Data Acquisition Front End
The CS5505-ASZR serves as a low-cost, low-power analog front end for general-purpose multi-channel data-acquisition systems in laboratory and test equipment. Its 4-to-1 input mux and serial interface connect directly to microcontrollers, FPGAs, or DSPs over a 3- or 4-wire SPI bus. The CS5505 datasheet specifies the on-chip digital filter as a SINC³ type, which provides steep roll-off and excellent stopband attenuation — a key advantage when the input signal occupies only a narrow low-frequency band. Compared with 16-bit SAR ADCs in this price range, the CS5505-ASZR's Σ-Δ architecture provides superior noise-free resolution at the cost of conversion speed.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: CS5505-ASZR — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | CS5506-ASZ | CS5507-ASZ | CS5508-ASZ | CS5505-ASZ |
|---|---|---|---|---|---|
| Brand | Cirrus Logic | Cirrus Logic | Cirrus Logic | Cirrus Logic | Cirrus Logic |
| Package | 24-SSOP | 24-SSOP - same | 24-SSOP - same | 24-SSOP - same | 24-SSOP - same |
| Resolution | 16 bits | 20 bits | 16/20 bits | 20 bits | 16 bits |
| Number of Channels | 4 | 4 | 4 | 4 | 4 |
| Architecture | Sigma-Delta | Sigma-Delta | Sigma-Delta | Sigma-Delta | Sigma-Delta |
| Interface | Serial (SPI) | Serial (SPI) | Serial (SPI) | Serial (SPI) | Serial (SPI) |
| Packaging Style | Tape & Reel | Tube | Tube | Tube | Tube |
主な差別化要因
- Same-family pin-compatible upgrade path to 20 bits （vs CS5506-ASZ)
- Tape-and-reel packaging for high-volume manufacturing （vs CS5505-ASZ (tube version))
- Lower power than 16-bit SAR alternatives （vs Generic 16-bit SAR ADC in same price tier)
設計ノート
Route AGND and DGND as separate nets and join them only at the CS5505-ASZR's AGND pin. Place 0.1 µF ceramic decoupling capacitors on AVDD and DVDD within 5 mm of their respective supply pins; add a 10 µF bulk tantalum or aluminum-polymer capacitor at the supply entry point. The 24-SSOP package's exposed pad (if present in your board layout) should be soldered to AGND to provide a low-impedance thermal and electrical return. Keep digital lines (SCLK, SDO, CS̄) routed away from AIN pins to avoid digital-to-analog crosstalk.
The CS5505-ASZR's Sigma-Delta modulator and on-chip digital filter can inject high-frequency noise into the AVDD rail. According to the Cirrus Logic CS5505 datasheet, use a ferrite bead in series with the AVDD supply followed by a 10 µF + 0.1 µF capacitor pair. Avoid driving AVDD from a switching regulator's output node; if a switching pre-regulator is required, use a low-noise LDO such as the TPS7A4701 or TPS7A30 downstream. For multi-channel systems, sequence the analog front end and ADC to settle before initiating conversion to avoid channel-to-channel crosstalk.
Do not leave the CS5505-ASZR's RST̄ pin floating — pull it high to DVDD through a 10 kΩ resistor. The OSCIN/OSCOUT pins require a low-jitter crystal; do not substitute a ceramic resonator. When using the internal reference (REFOUT driving REFIN), bypass REFOUT with a 1 µF NPO/C0G ceramic capacitor; the reference is not designed to drive external loads beyond REFIN. For thermocouple inputs, enable the CS5505's cold-junction compensation register per the datasheet and calibrate against a known temperature reference.
コンプライアンス情報
RoHS-compliant SSOP-24 package per Cirrus Logic product page. The -ASZ industrial grade supports -40C to +85C. Not AEC-Q100 qualified — not intended for automotive under-hood or powertrain applications.
