AD73322ARZ - Dual 16-Bit AFE, 73mW, 28-SOIC | Analog Devices
料号： AD73322ARZ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $13.2 | $132.00 |
| 100 | $11.85 | $1,185.00 |
| 500 | $10.6 | $5,300.00 |
| 1,000 | $9.4 | $9,400.00 |
AD73322ARZ 概述
An analog front-end (AFE) is a mixed-signal subsystem that bridges analog transducers (microphones, speakers, line interfaces) and a digital signal processor (DSP). In the signal chain, an AFE sits between the sensor and the host processor, performing sampling, reconstruction, anti-alias filtering, and gain conditioning. The AD73322 specifically belongs to the broader class of programmable voice-band codecs (analog-to-digital converter plus digital-to-analog converter plus filtering in one chip), positioned hierarchically as AFE -> mixed-signal IC -> data converter -> signal conditioning IC -> semiconductor. Common synonyms include "voice codec", "audio codec", and "DSP front-end".
Key features of the AD73322ARZ include a programmable sampling rate (8 kSPS, 16 kSPS, 32 kSPS, 64 kSPS) derived from an internal master clock, an 8 kHz to 64 kHz sample-rate range, a serial port (SPORT) with rates programmable to match slow or fast DSP engines, and an on-chip voltage reference (REFCAP, 2.4 V when 5VEN=1). The 5VEN pin allows operation from either 3 V or 5 V supplies. The device supports daisy-chained (cascaded) operation of multiple AD73322 units to increase channel count without consuming additional DSP serial ports. ADI quotes 77 dB SNR for both ADC and DAC channels across voiceband bandwidth, with low total harmonic distortion suitable for full-duplex speech paths.
Typical applications include voice-over-IP (VoIP) handsets, speech recognition front-ends, modem analog front-ends, audio recording/playback subsystems, and industrial two-way intercoms. The wide DSP compatibility and cascadable architecture also make it useful in conference phones and call-center headset bases. When designing with this part, note that the part dissipates approximately 73 mW at 3 V operation; provide a small copper pour on the SOIC exposed area and keep digital switching noise away from the AGND plane to preserve the 77 dB SNR figure.
直接替换替代料： AD73322ARZ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
AD73322ARZ-REEL
✅ 直接替换📋 参考替代料（不在目录中）
AD73322ARZ-RL
✅ 直接替换📋 参考替代料（不在目录中）
AD73322ARZ-R7
✅ 直接替换📋 参考替代料（不在目录中）
AD73322LYRZ
✅ 直接替换📋 参考替代料（不在目录中）
AD73322ARZ-R2
✅ 直接替换📋 参考替代料（不在目录中）
AD73322ARZ 最大额定值与电气特性
| 功能 | Dual Analog Front End (2 ADC + 2 DAC) |
| Resolution (ADC/DAC) | 16 bit / 16 bit |
| Number of ADC Channels | 2 |
| Number of DAC Channels | 2 |
| Signal-to-Noise Ratio (SNR) | 77 dB (voiceband) |
| Sampling Rate (programmable) | 8 kSPS / 16 kSPS / 32 kSPS / 64 kSPS |
| Master Clock | 16.384 MHz (derived internally) |
| Digital Interface | SPORT (Serial Port), programmable frame rate |
| 电源电压 | 2.7 V to 5.5 V (5VEN selects 5 V mode) |
| Total Power Consumption | 73 mW (typical) |
| Internal Reference Voltage (REFCAP) | 1.2 V (5VEN=0) / 2.4 V (5VEN=1) |
| REFCAP Drift | 50 ppm/C |
| REFCAP Capacitor Required | 0.1 uF (REFCAP to AGND2) |
| REFOUT Output Impedance | 130 ohm (typical) |
| 封装 | 28-pin SOIC (300 mil, wide) |
| 工作温度 | -40C to +85C |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
AD73322ARZ 引脚配置
| 引脚 1 | REFCAP — Internal reference bypass capacitor (0.1 uF to AGND2) |
| 引脚 2 | REFOUT — Buffered reference output (2.4 V or 1.2 V based on 5VEN) |
| 引脚 3 | AGND2 — Analog ground (return for REFCAP and REFOUT) |
| 引脚 4 | AVDD — Analog supply voltage (2.7 V to 5.5 V) |
| 引脚 5 | VINP1 — ADC channel 1 positive input |
| 引脚 6 | VINN1 — ADC channel 1 negative input |
| 引脚 7 | VINP2 — ADC channel 2 positive input |
| 引脚 8 | VINN2 — ADC channel 2 negative input |
| 引脚 9 | VOUTP1 — DAC channel 1 positive output |
| 引脚 10 | VOUTN1 — DAC channel 1 negative output |
| 引脚 11 | VOUTP2 — DAC channel 2 positive output |
| 引脚 12 | VOUTN2 — DAC channel 2 negative output |
| 引脚 13 | AGND1 — Analog ground (return for ADC/DAC signal paths) |
| 引脚 14 | 5VEN — 5 V enable (selects 2.4 V REFCAP when high, 1.2 V when low) |
| 引脚 15 | SCLK — External serial clock input (master clock source) |
| 引脚 16 | DVDD — Digital supply voltage (2.7 V to 5.5 V) |
| 引脚 17 | DGND — Digital ground |
| 引脚 18 | DR — Data receive (from DSP to AD73322, MOSI) |
| 引脚 19 | DT — Data transmit (from AD73322 to DSP, MISO) |
| 引脚 20 | SDFS — SPORT frame sync |
| 引脚 21 | RFS — Receive frame sync (for data into ADC) |
| 引脚 22 | TFS — Transmit frame sync (for data out of DAC) |
| 引脚 23 | SDOFS — Secondary data output frame sync (for cascaded devices) |
| 引脚 24 | RESET — Hardware reset (active low) |
| 引脚 25 | MCLK — Master clock output (16.384 MHz reference to DSP) |
| 引脚 26 | SE — SPORT enable (active high to enable serial port) |
| 引脚 27 | CDOUT — Cascade data output (for daisy-chain operation) |
| 引脚 28 | CDIN — Cascade data input (for daisy-chain operation) |
典型应用
AD73322ARZ 适用于 6 应用s: VoIP Handset Speech Path, Speech Recognition Front-End, Modem Analog Front-End, Conference Phone Base Station, Industrial Intercom / Paging Station, Voice Prompting / Playback Module.
VoIP Handset Speech Path
The AD73322ARZ is a near-ideal AFE for VoIP handset speech paths because it integrates two 16-bit ADC and two 16-bit DAC channels in a single 28-SOIC device, supporting the simultaneous full-duplex microphone and speaker paths required for handset operation. With 77 dB SNR and 8 kSPS to 64 kSPS programmable sampling, the same silicon handles narrowband (8 kHz) G.711 telephony and wideband (16 kHz) G.722 speech without hardware change. Designers typically place the part between the analog microphone preamp and the DSP, with AVDD and DVDD decoupled by 10 uF + 0.1 uF ceramic pairs; AGND and DGND should be tied under the exposed pad to preserve SNR. Compared to discrete codec + filter solutions, the integrated AFE saves roughly 80 mm^2 of board area and eliminates sample-clock alignment issues.
推荐
Speech Recognition Front-End
Speech recognition front-ends demand low-noise, low-distortion analog capture so that acoustic features can be extracted reliably. The AD73322ARZ delivers 77 dB SNR with 16-bit linear PCM output, which provides more than 90 dB of dynamic range across voiceband signals - sufficient headroom for far-field microphone arrays in smart speakers and industrial voice-control HMIs. The SPORT interface streams PCM samples directly into a recognition DSP or ARM Cortex-M4 host, with programmable sample rate allowing the same hardware to run 8 kHz keyword-spotting or 16 kHz full-grammar recognition. Cascade mode allows two AD73322 devices to provide 4 microphone channels for beamforming without consuming additional host serial ports.
推荐
Modem Analog Front-End
Legacy and industrial modem designs (V.32bis, V.34, V.90 analog front-end stages) rely on dual-channel 16-bit codecs with deterministic sampling. The AD73322ARZ matches this requirement with a 16.384 MHz master clock that generates the standard 8 kSPS symbol rate for PCM modem transmission. Both ADC and DAC channels reach 77 dB SNR, allowing the modem to maintain 30 dB+ SNR margin over analog PSTN lines even with bridge-tap and crosstalk impairments. The SPORT protocol supports both short and long frame-sync modes, so the same AD73322 can be paired with a wide variety of modem DSP engines. Designers using ADI ADSP-21xx modems typically require only register-level initialization, no external anti-alias filter beyond a simple RC network.
推荐
Conference Phone Base Station
Conference phone base stations require multiple microphone and speaker channels to support full-duplex conversation in a 360-degree pickup pattern. Multiple AD73322ARZ devices can be cascaded on a single SPORT bus to provide 4 to 16 simultaneous analog channels without increasing host DSP serial port count, reducing both BOM cost and software complexity. The 28-SOIC footprint simplifies PCB layout because the part fits between the analog microphone preamps and the SHARC processor with standard 0.1 inch pitch routing. With 73 mW typical dissipation, no heatsink is needed even at the highest 64 kSPS rate, allowing sealed plastic enclosures without thermal venting.
推荐
Industrial Intercom / Paging Station
Industrial intercoms and paging stations operate in electrically noisy environments with long cable runs and motor-driven relay switching. The AD73322ARZ's 77 dB SNR plus integrated anti-alias filtering removes the need for external op-amp filter stages, improving both reliability and mean time between failure. The wide 2.7 V to 5.5 V supply range allows direct connection to industrial 24 V->5 V or 12 V rails via simple LDOs. SPORT isolation can be implemented with standard digital isolators (e.g., ADuM1411) for galvanic isolation between the analog line interface and the DSP, supporting IEC 61850 surge immunity requirements in substation intercom applications.
推荐
Voice Prompting / Playback Module
Voice prompting modules (elevator announcements, transit station PA, kiosk audio cues) require only DAC playback capability but benefit from a single-chip integrated solution that also supports a microphone ADC for ambient monitoring. The AD73322ARZ provides both functions in a 28-SOIC package, allowing the same PCB to be reused across different SKUs with playback-only or full-duplex firmware. At 16 kSPS the dual 16-bit DACs deliver speech intelligibility that exceeds the 5.5 kHz bandwidth required for natural-sounding prompts, while the 73 mW power dissipation keeps total system consumption within PoE class-1 budget for IP-based prompting terminals.
推荐
推荐产品汇总
工程参考数据： AD73322ARZ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | AD73322ARZ-REEL | AD73322ARZ-RL | AD73322ARZ-R7 | AD73322LYRZ | AD73322ARZ-R2 |
|---|---|---|---|---|---|---|
| Package | 28-SOIC | 28-SOIC (tape and reel) | 28-SOIC (reel) | 28-SOIC (reel) | 28-SOIC (cost-reduced) | 28-SOIC (reel) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution (ADC/DAC) | 16 bit / 16 bit | 16/16 | 16/16 | 16/16 | ||
| ADC/DAC Channels | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 | ||
| SNR (voiceband) | 77 dB | 77 dB | 77 dB | 77 dB | ||
| Process Node | 0.6 micron (original) | 0.35 micron (cost-reduced) | 0.6 micron (original) | 0.6 micron (original) | ||
| Pinout Compatibility | Reference | Pin- and software-compatible per ADI | Identical | Identical | ||
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
关键差异点
- Cost-reduced L variant offers pin-compatible upgrade path （对比 AD73322LYRZ)
- Same-family reel variants support automated assembly （对比 AD73322ARZ-REEL, AD73322ARZ-R7, AD73322ARZ-R2)
- Dual full-duplex channels in a single 28-SOIC （对比 AD73322ARZ-R7)
设计说明
The AD73322ARZ draws approximately 73 mW at typical 3 V operation. Decouple AVDD and DVDD separately with 10 uF tantalum plus 0.1 uF ceramic capacitors placed within 5 mm of the respective supply pins. Tie AGND1, AGND2, and DGND to a single low-impedance ground plane under the SOIC body. Avoid running digital switching traces across the analog ground region to preserve the 77 dB SNR.
Route the differential ADC inputs (VINP1/VINN1 and VINP2/VINN2) as matched-length pairs to preserve common-mode rejection. Place the 0.1 uF REFCAP capacitor directly between the REFCAP pin and AGND2 with traces shorter than 5 mm. Keep SCLK traces away from VINP/N pairs; the SPORT clock is the dominant high-frequency aggressor on this part. For cascade mode, route SDOFS as a low-skew clock to all cascaded AD73322 devices.
Estimated: when driving single-ended inputs, bias the unused VINN pin to mid-supply (AVDD/2) through a low-impedance buffer; do not leave it floating or SNR will degrade by 5-10 dB. Always drive the 5VEN pin to a valid logic level (do not leave it floating) - a floating 5VEN pin can cause REFCAP voltage instability. The RESET pin must be held low for at least 100 ns after DVDD stabilizes for clean initialization. When cascading, ensure the SDOFS of device N connects to the SDFS of device N+1 with no stubs.
合规信息
RoHS compliant per ADI product page. AEC-Q100 qualification not available for this part family - for automotive applications use AEC-Q100 qualified ADI AFEs such as the AD1845 or SSM2604.
