CS3308-CQZR - 8-Ch Analog Volume Control, 48-LQFP | Cirrus Logic
部品番号: CS3308-CQZR ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $19.15 | $19.15 |
| 10 | $17.85 | $178.50 |
| 100 | $15.4 | $1,540.00 |
| 500 | $13.2 | $6,600.00 |
| 1,000 | $11.75 | $11,750.00 |
CS3308-CQZR 概要
A digital volume control IC is an integrated circuit that performs attenuation or amplification of analog audio signals under the command of a microcontroller or DSP, replacing mechanical potentiometers in modern equipment. Within the audio signal chain, it sits between the source selector or DAC output and the power amplifier, and it belongs to the broader family of audio special-purpose ICs alongside DACs, ADCs, and audio amplifiers. Compared with mechanical potentiometers, a digitally controlled attenuator offers precise repeatability, remote control, memory recall, and absence of mechanical wear.
Key features of the CS3308-CQZR include 8 independent channels with 0.5 dB step resolution, configurable zero-crossing detection to eliminate zipper noise during volume changes, a wide supply range of 3.1 V to 5.25 V suitable for 3.3 V and 5 V system rails, selectable I2C or SPI serial control interface, and hardware-addressable device IDs that allow up to 128 cascaded devices on a single bus. The combination of fine resolution and zero-crossing logic preserves audio signal integrity during level transitions.
Technically, the CS3308 uses a resistive ladder network with CMOS switches and an internal zero-crossing detector that holds the wiper position until the audio waveform crosses zero, suppressing audible artifacts. The architecture provides very low total harmonic distortion plus noise (THD+N) and high channel-to-channel matching, which are essential parameters for multi-channel professional audio gear. Programmable address pins enable bus expansion without adding microcontroller I/O.
Typical applications include professional audio mixing consoles, multichannel AV receivers and amplifiers, broadcast studio equipment, automotive head units and infotainment amplifiers, and home theater preamplifiers. In each case the CS3308 replaces mechanical or electromechanical volume controls with a precise, software-driven solution that supports remote control and preset recall.
When designing with the CS3308-CQZR, ensure that analog input signals remain within the recommended common-mode and clip range, place bypass capacitors close to the supply pins, and verify I2C/SPI address selection when stacking multiple devices on the same bus. The LQFP-48 footprint gives good thermal performance for continuous signal-path operation.
This page synthesizes current distributor pricing and stock, drop-in alternatives with the same 48-LQFP footprint, and practical design notes not consolidated in the manufacturer datasheet, delivering actionable information for both new designs and legacy audio system refreshes.
ドロップイン代替品: CS3308-CQZR — 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。
クイック比較ツール — 並列比較する代替部品を選択:
CS3308-CQZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
CS3318-CQZR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
CS3308-CQZ
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
CS3308-CQZR 最大定格＆電気的特性
| 機能 | 8-Channel Digitally Controlled Analog Volume Control |
| Number of Channels | 8 |
| Supply Voltage Range | 3.1 V to 5.25 V |
| Control Interface | I2C / SPI (selectable) |
| Zero-Crossing Detection | Configurable (glitch-free transitions) |
| Cascadable Devices on Single Bus | Up to 128 |
| Application | High-End Audio |
| パッケージ | 48-LQFP (7x7 mm) |
| 実装タイプ | Surface Mount |
| 動作温度範囲 | -40 C to +85 C (commercial audio) |
| Lead Free Status | Lead Free |
| RoHS ステータス | RoHS Compliant |
| Packaging | Tape & Reel (TR) |
CS3308-CQZR ピン構成
| ピン 1 | AIN0+ — Analog input channel 0 positive |
| ピン 2 | AIN0- — Analog input channel 0 negative |
| ピン 3 | AOUT0+ — Analog output channel 0 positive |
| ピン 4 | AOUT0- — Analog output channel 0 negative |
| ピン 5 | AGND — Analog ground |
| ピン 6 | VA — Analog supply |
| ピン 7 | VD — Digital supply |
| ピン 8 | DGND — Digital ground |
| ピン 9 | SCL/SCLK — I2C clock / SPI clock |
| ピン 10 | SDA/MOSI — I2C data / SPI MOSI |
| ピン 11 | AD0/MISO — Address select 0 / SPI MISO |
| ピン 12 | AD1/CS — Address select 1 / SPI chip select |
| ピン 13 | MUTE — Active-high mute input |
| ピン 14 | ZCD — Zero-crossing detect enable |
| ピン 15 | AIN1+ — Analog input channel 1 positive |
| ピン 16 | AIN1- — Analog input channel 1 negative |
| ピン 17 | AOUT1+ — Analog output channel 1 positive |
| ピン 18 | AOUT1- — Analog output channel 1 negative |
| ピン 19 | AIN2+ — Analog input channel 2 positive |
| ピン 20 | AIN2- — Analog input channel 2 negative |
| ピン 21 | AOUT2+ — Analog output channel 2 positive |
| ピン 22 | AOUT2- — Analog output channel 2 negative |
| ピン 23 | AIN3+ — Analog input channel 3 positive |
| ピン 24 | AIN3- — Analog input channel 3 negative |
| ピン 25 | AOUT3+ — Analog output channel 3 positive |
| ピン 26 | AOUT3- — Analog output channel 3 negative |
| ピン 27 | AIN4+ — Analog input channel 4 positive |
| ピン 28 | AIN4- — Analog input channel 4 negative |
| ピン 29 | AOUT4+ — Analog output channel 4 positive |
| ピン 30 | AOUT4- — Analog output channel 4 negative |
| ピン 31 | AIN5+ — Analog input channel 5 positive |
| ピン 32 | AIN5- — Analog input channel 5 negative |
| ピン 33 | AOUT5+ — Analog output channel 5 positive |
| ピン 34 | AOUT5- — Analog output channel 5 negative |
| ピン 35 | AIN6+ — Analog input channel 6 positive |
| ピン 36 | AIN6- — Analog input channel 6 negative |
| ピン 37 | AOUT6+ — Analog output channel 6 positive |
| ピン 38 | AOUT6- — Analog output channel 6 negative |
| ピン 39 | AIN7+ — Analog input channel 7 positive |
| ピン 40 | AIN7- — Analog input channel 7 negative |
| ピン 41 | AOUT7+ — Analog output channel 7 positive |
| ピン 42 | AOUT7- — Analog output channel 7 negative |
| ピン 43 | REF — Internal reference bypass |
| ピン 44 | VA — Analog supply (second pin) |
| ピン 45 | AGND — Analog ground (second pin) |
| ピン 46 | DGND — Digital ground (second pin) |
| ピン 47 | VD — Digital supply (second pin) |
| ピン 48 | RESET — Power-on reset / standby control |
主な用途
CS3308-CQZR の用途: 6 件s: Professional Audio Mixing Consoles, Multichannel AV Receivers and Home Theater Preamplifiers, Broadcast Studio Equipment, Automotive Infotainment Amplifiers, Musical Instrument Amplifiers and Effects Processors, Multichannel Headphone and Studio Monitor Controllers.
Professional Audio Mixing Consoles
The CS3308-CQZR's 8 independent channels and configurable zero-crossing detection make it ideal for professional mixing consoles requiring glitch-free, software-driven fader control. The I2C/SPI bus allows up to 128 cascaded devices, enabling very large channel-count consoles without expanding host controller I/O. Placed between each input strip's summing bus and the master output, it provides 0.5 dB resolution, low THD+N, and rock-solid repeatability that mechanical faders cannot match.
おすすめ
Multichannel AV Receivers and Home Theater Preamplifiers
The CS3308-CQZR is well suited for AV receivers and preamps that drive 7.1 or larger surround configurations. Its 8 channels cover a full 7.1 layout plus a subwoofer return, while zero-crossing detection eliminates zipper noise during master-volume changes. The 48-LQFP footprint is easy to route on multi-layer AV boards, and the I2C interface simplifies integration with the main audio DSP or microcontroller.
おすすめ
Broadcast Studio Equipment
The CS3308-CQZR's low distortion, fine step resolution, and glitch-free transitions are essential for broadcast monitoring, talkback, and routing switchers where audible clicks would be unacceptable. Its hardware-addressable bus structure enables up to 128 devices on a single I2C or SPI line, supporting large installations with minimal control wiring. The wide 3.1 V to 5.25 V supply range accommodates both legacy and modern broadcast systems.
おすすめ
Automotive Infotainment Amplifiers
The CS3308-CQZR can serve automotive head units and premium infotainment amplifiers that need software-driven master volume, balance, fader, and equalizer level control across multiple channels. Zero-crossing detection prevents pops during volume sweeps, and the 48-LQFP footprint fits behind typical head-unit display assemblies. For AEC-Q100 qualified automotive builds, designers should consult Cirrus Logic for the latest automotive-grade CS33xx family options.
おすすめ
Musical Instrument Amplifiers and Effects Processors
The CS3308-CQZR enables digital master-volume and channel-level recall inside high-end instrument amplifiers and multi-effects processors, replacing mechanical pots that wear out and drift. Its 8 channels are sufficient for guitar-channel switching, send-level returns, and master volume stages in a single IC. The 3.1 V to 5.25 V supply range lets designers run it from the same rails that power analog op-amp stages.
おすすめ
Multichannel Headphone and Studio Monitor Controllers
The CS3308-CQZR is an excellent fit for multichannel headphone amplifiers and studio monitor controllers that drive multiple cue mixes. Eight channels can support a 7.1 surround monitor controller with subwoofer, while zero-crossing detection ensures click-free switching between monitors and headphone sets. The cascadable I2C/SPI bus enables large monitor controllers with many output channels without scaling the host microcontroller.
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: CS3308-CQZR — 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 | CS3308-CQZ | CS3318-CQZR | CS3308-CQZ |
|---|---|---|---|---|
| Brand | Cirrus Logic | Cirrus Logic | Cirrus Logic | Cirrus Logic |
| Package | 48-LQFP (7x7) | 48-LQFP (7x7) - same | 48-LQFP (7x7) - same | 48-LQFP (7x7) - same |
| Number of Channels | 8 | 8 | 8 | 8 |
| Supply Voltage Range | 3.1 V to 5.25 V | 3.1 V to 5.25 V | 3.3 V / 5 V single-supply optimized | 3.1 V to 5.25 V |
| Control Interface | I2C / SPI selectable | I2C / SPI selectable | I2C / SPI selectable | I2C / SPI selectable |
| Zero-Crossing Detection | Configurable | Configurable | Configurable | Configurable |
| Cascadable Devices per Bus | Up to 128 | Up to 128 | Up to 128 | Up to 128 |
| Packaging Format | Tape & Reel | Tray | Tape & Reel | Tray |
主な差別化要因
- Pin-compatible +/-5 V dual-supply variant with 123 dB dynamic range （vs CS3318-CQZR)
- Tape-and-reel packaging optimized for SMT production lines （vs CS3308-CQZ)
- Up to 128 cascadable devices on a single I2C or SPI bus （vs Discrete digital potentiometers)
設計ノート
Estimated: at a 5.0 V supply with 8 channels active in typical audio paths, total quiescent current is well under 50 mA for the IC. Designers should provide separate analog (VA) and digital (VD) supplies with ferrite-bead or RC isolation to keep digital switching noise out of the audio path. Decouple each VA and VD pin with 0.1 uF ceramic capacitors placed as close as possible to the IC pins, and add a bulk 10 uF tantalum or aluminum-polymer capacitor per supply rail for low-frequency stability.
Route all analog input and output traces as differential pairs to maximize common-mode rejection and minimize crosstalk between the 8 channels. Keep digital control traces (SCL/SDA, MOSI/MISO, CS) short and away from analog traces, and stitch the PCB ground plane around the LQFP-48 footprint. Place the reference bypass capacitor on the REF pin within 5 mm to maintain low channel-to-channel gain matching across the array.
Always enable zero-crossing detection when changing volume levels on live audio signals to avoid zipper noise or clicks; disabling it can be acceptable only during initialization when no signal is present. Verify that the MUTE pin sequencing avoids simultaneous channel-level changes that can exceed the device's internal slew limits. When cascading multiple CS3308-CQZR devices, ensure that the AD0/AD1 hardware address pins are configured so that no two devices share the same I2C or SPI address.
コンプライアンス情報
RoHS compliant and lead free per DigiKey and Cirrus Logic product pages. AEC-Q100 qualification not specified for CS3308-CQZR; consult Cirrus Logic for automotive-grade equivalents. REACH and conflict-mineral statements not present in verified web data - marked unknown.
