Products > Integrated Circuits (ICs) > Audio ICs > ALC5651-CGT
  • ALC5651-CGT
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Ultra-Low Power Two-Channel Audio CODEC with SounzRealTM Digital Sound Effect for Mobile Devices

Manufacturer :
Realtek Semiconductor Corp
Package/Case :
Product Categories :
Audio ICs
RoHs Status:
Lead free/RoHS Compliant

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ALC5651-CGT Product Details

General Description
The ALC5651 is a high performance, low power, dual I²S interface audio CODEC. First I²S interface can support dual mode: normal I²S and I2S with TDM (Time Division Multiplexing) interface. The TDM interface can transmit/receive up to 8 channels data. The transmitted data can from analog input or digital microphone input. Also the received data can to headphone output, line output or PDM output. Asynchronous Sample Rate Converter (ASRC) provides independent and asynchronous connections to different processors, such as an application processor, baseband processor or wireless transceiver(BT).
The Pulse Density Modulation (PDM) output interface can drive external PDM Class-D amplifier. The PDM interface is also build in 8-bits pattern control function for control external PDM amplifier.
The ALC5651 features an ultra low power cap-free headphone amplifier. It consumes only less than 5.5mW power during playback, providing mobile system longer battery life under headphone listening mode.
The integrated DRC(Dynamic Range Controller) and 7-band parametric Equalizer provide further digital sound processing capability of audio playback paths. The DRC in ALC5651 continuously monitors the DAC output level. When the power level is low, it increases the input signal gain to make it sound louder. At the same time, if a peaking signal is detected, it autonomously reduces the applied gain to avoid hard clipping. It ensures the maximum/consistent signal amplitude without producing audio clipping and speaker damage. The 7-band parametric Equalizer contains 7 independent filters with programmable gain, center frequency and bandwidth to tailor the frequency characteristics of embedded speaker system according to user preferences.
For microphone recording, the DRC in ALC5651 can be used as AGC(Auto Gain Controller) to maintain a constant recording volume. Besides, a dynamic wind reduction filter is built in on recording path. The filter can detect the level of wind noise and on/off dynamically to keep the recording quality.
SounzRealTM digital sound effect technology is configurable to provide better listening experience. OminiSound EXPTM expands the sound field of embedded stereo speaker. BassBack EXPTM (low frequency effect) to listeners without subwoofer needed. TruTreble EXPTM adds processed harmonic tones at high frequency, bringing more melody and details for music listening. 
ALC5651 only requires two voltage supplies and consume ultra low power, making it ideal for mobile devices. 
• Digital-to-Analog Converter with 100dBA SNR
• Analog-to-Digital Converter with 94dBA SNR
• Differential analog microphone inputs with boost pre-amplifiers and low noise microphone bias
- +20/+24/+30/+35/+40/+44/+50/+52 dB microphone boost gain
- MIC input to ADC with 50dB boost gain, SNR > 66dBA and THD+N < -65dB
- Adjustable MICBIAS (0.9*MICVDD or 0.75*MICVDD)
• Stereo line inputs
- Line input to ADC with 0dB gain, SNR >= 94dBA, THD+N <= -83dB
• Stereo line outputs
- DAC to line output with 0dB gain, SNR >= 100dBA, THD+N <= -86dB
- Stereo Cap-Free headphone amplifier with ultra low power consumption for playback 20mW/CH (AVDD=CPVDD=1.8V, THD+N    <= -80dB, 16Ohm Load)
- Playback power consumption <= 5.5mW (AVDD=VBVDD=CPVDD=1.8V, 16Ohm, With I2S Clock, Playback Silence)
- Playback power consumption <= 13mW (AVDD=VBVDD=CPVDD=1.8V, 16Ohm, With I2S Clock, Playback 1mW/CH)
• Audio jack insert/combo jack detection
• Inside PLL can receiver wide range clock input
Digital Features:
• One 24bit/8kHz ~ 192kHz I²S S/PCM/TDM interface for stereo DAC and stereo ADC
• One 24bit/8kHz ~ 192kHz I²S S/PCM interface for stereo DAC and stereo ADC
• I²C control interface
• One digital microphone interface support
• Asynchronous sample rate converter (ASRC) for each interface
• 7-bands flexible equalizer (EQ) for DAC path or ADC path
• Enhanced DRC(Dynamic Range Control)/AGC(Auto Gain Control) function for DAC path or ADC path
• One wind noise reduction filter
• Zero detection and soft volume for pop noise suppression
• SounzRealTM audio sound processing
- OminiSound EXPTM
- TruTreble EXPTM
- BassBack EXPTM

ALC5651-CGT Pinout
(Picture: Pinout)

ALC5651-CGT Block Diagram
(Picture: Diagram)

Technical Parameters

Manufacturer REALTEK RoHs Status Lead free/RoHS Compliant
Packing Tape & Reel (TR)/Cut Tape (CT)/Tray/Tube Package/Case QFN40

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Estimated Delivery Time: Jan 28 - Feb 02 days (choose Expedited at checkout).

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    We have rich products, can meet your various needs.

  • Minimum order quantity starts from 1pcs.

    Minimum order quantity starts from 1pcs.

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    90 days quality guarantee for all products.


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All the products will packing in anti-staticbag. Ship with ESD antistatic protection.

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After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity.


1.We provide 90 days warranty.

2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.


Q: How does Jotrin guarantee that ALC5651-CGT is the original manufacturer or agent of REALTEK?
We have a professional business development department to strictly test and verify the qualifications of REALTEK original manufacturers and agents. All REALTEK suppliers must pass the qualification review before they can publish their ALC5651-CGT devices; we pay more attention to the channels and quality of ALC5651-CGT products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of ALC5651-CGT chips? Including REALTEK original factory information, application, ALC5651-CGT pictures?
You can use Jotrin's intelligent search engine, or filter by Audio ICs category, or find it through Realtek Semiconductor Corp Information page.
Q: Are the REALTEK's ALC5651-CGT price and stock displayed on the platform accurate?
The REALTEK's inventory fluctuates greatly and cannot be updated in time, it will be updated periodically within 24 hours. After submitting an order for ALC5651-CGT, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
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Yes. We accept offline orders.
We can provide order placement service. You only need to log in, click "My Orders" to enter the transaction management, and you will see the "Order Details" interface. After checking it, select all and click "Place Order". In addition, you can enjoy coupons or other selected gifts when placing orders online.
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Note: It may take up to 24 hours before carriers will display tracking information. In normal conditions, Express delivery needs 3-5 days, Registered Mail needs 25-60 days.
Q: What is the process for returns or replacement of ALC5651-CGT?
All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the ALC5651CGT we delivered, we will accept the replacement or return of the ALC5651-CGT only when all of the below conditions are fulfilled:
(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
(2)We are informed of the defect described above within 90 days after the delivery of ALC5651-CGT.
(3)The ALC5651-CGT is unused and only in the original unpacked packaging.
Two processes to return the products:
(1)Inform us within 90 days
(2)Obtain Requesting Return Authorizations
More details about return electronic components please see our Return & Change Policy.
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Realtek Semiconductor Corp., located in the Hsinchu Science-based Industrial Park, Taiwan's "Silicon Valley" began with a small group of young, devoted engineers in 1987....

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