Since the introduction of an independent DAC by vivo in vivo X1, Hi-Fi phones have begun to emerge, and several consecutive vivo phones have been using separate Hi-Fi chips. At the same time, consumers are starting to get confused by these unclear chip models: DACs, ADCs, DSPs, op amps and amps, codecs, and stand-alone DACs. In addition, the combination of Hi-Fi chips is a must. The same manufacturer has different Hi-Fi chips, and the same Hi-Fi chips have different features. Different manufacturers with different functions or the same function Hi-Fi chip has another difference? Today we start with simple, focus on what DAC, ADC, DSP, codec, op amp, amp these six terms.
The ADC is an analog-to-digital signal encoding chip, such as the TLV320 ADC. The DAC is a digital to analog signal decoding chip such as the ES9028. The former is generally used for recording and the latter is generally used for decoding audio. The intermediate digital signal processing is handled by the DSP. The analog signal is input from the ADC, and it is converted into a digital signal after being encoded, passed to the DSP for operation and processing, and finally passed to the DAC to re-decode the digital signal into an analog signal and output it.
The amp is the name of a class of products, not the chip type. There can be multiple op amp chips in one amp, such as the OPA1612 and OPA2604. In addition, there are also classifications between the op amp chips, some of which only act on the outside and do not affect the headset, such as NXP's TFA9890. Some only work on the headset and not on the outside, such as Maxim's MAX97220. The OPA1612 and OPA2604 op amp chips can act on both the headset and the speaker.
We have always thought that codec must be integrated in the SoC, and the independent DAC is external to the SoC, so the codec and the independent DAC can be well identified by the positional arrangement between the chips. In fact, this is the wrong idea.
The codec can also be independent of the SoC. For example, the codecs of Samsung and Apple's mobile phones are generally independent of the SoC and can be considered as independent audio chips. In other words, Samsung S7 (Snapdragon 820 version) the Qualcomm home WCD9335 codec is also an independent audio chip, but the decoding effect is not a good chip like CS4398. Similarly, vivo Xplay5 also has two decoding chips: WCD9335 codec and CS4398 DAC. Is there no independent DAC for å•¥codec?
Codec also integrates ADCs, DACs, and other audio-related modules. For example, the AK4961 integrates ADCs, DACs, and amps at the same time. It is a complete audio solution. It should be more powerful than a stand-alone DAC that cannot be used independently. Right? The problem is in concentration. Codec has more integrated functions and more natural considerations. The amount of computation will naturally be shared by multiple functional modules, and the decoding efficiency and effect will naturally not be as good as that of an independent DAC.
A few years ago it seemed as if Hi-Fi solutions were becoming more popular with three chips, such as vivo Xshot, TLV320ADC+CS4398+MAX97220. Since the emergence of high-integration op-amp DACs such as SABRE9018Q2C and ES9118, the industry seems to have begun to pay attention to this new Hi-Fi solution. The biggest advantage of doing so is to save the internal space of the mobile phone, and at the same time continue to satisfy the heart-wrenching of consumers who like to stack materials on the Hi-Fi circuit. The integration degree is between the codec and the independent DAC, taking into account the decoding effect and efficiency.
Finally, let's take a look at the mainstream Hi-Fi chip with independent DACs, DACs and codec integrated with op amp chips, and what are the corresponding models?
Mainstream independent DAC horizontal contrast
ES9018K2M: vivo X3, vivo Xplay3S, vivo X5Max, Xiaomi Note Standard Edition, Meizu MX4 Pro and Meizu PRO 5, Blue Devils MOS1 max, TCL Dongdong Gun 2 and Gigaset ME and Gigaset ME pro
SABRE9018C2M: LG V10, Legend Music Lemon X3, Millet Note Premium Edition
ES9018AQ2M: Geek Out V2 portable decoding amp machine, can be used with smart phones, generally best to find a relatively large USB output power of the phone, power is too low will bring this portable machine. Since power consumption and heat generation are relatively large, it is not recommended to use it with a mobile phone for a long time, and the sound quality is not as good as that on a computer.
ES9028Q2M: vivo X6Plus, vivo Xplay5 Ultimate
ES9028C2M: LG G5 B&O Hi-Fi Module
AK4490: Zhongxing Tianji 7
AK4375: Nubia Z9 Max, Nubia Z9 Max Elite and nubia My Prague, vivo X5ProV, vivo Y27, vivo X6 and vivo X6S,Gigaset ME pure
CS4398:vivo X1,vivo Xplay,vivo Xshot,vivo X5,vivo X5F,vivo X5Pro,vivo Xplay5,vivo X6S Plus
Many readers may wonder, is the ES90xx chip, C2M, Q2M like suffixes mean? In fact, it represents different ways of packaging the chip. C2M is the smallest of the three package sizes. The K2M package area is between C2M and Q2M. Q2M is the largest of the three package sizes. Comprehensive comparison of the above ESS section DAC chip parameters, LG G5 B & O Hi-Fi module ES9028C2M relatively the best. However, similar to Geek Out V2, this independent decoding amp machine, LG that Hi-Fi module also has a large heat and high power consumption issues.
Integrated op amp chip DAC lateral contrast
AK4376: The representative models are nubia Z11 and vivo X7
ES9118: No specific model
SABRE9018Q2C: No specific model
Mainstream codec horizontal contrast
338S1285:iPhone 6s
338S1201: iPhone 6 Plus
338S1117: iPhone 5
Lucky CS47L91: Samsung S7 (Exynos 8890 Edition)
CS43L36: Meizu PRO 6
WM5102: Samsung S4, Meizu MX3, Lenovo K860i
WCD9335: Samsung S7 (Shao Long 820 Version)
AK4961: nubia Z7 and nubia Z9
There are many mobile phones using these chips, but they are far from the size of the power supply, the number of op amps and Walkman, so the sound can not be compared. For the simplest example, the ES9018K2M on the phone is actually a shrunken version of the ES9018 and is tailored specifically for mobile devices. The former is a dual channel and the latter is an 8-channel. Regardless of parameters such as dynamic range or signal-to-noise ratio, the ES9018 is far better than the ES9018K2M. For example, the HIFIMAN 901 uses two ES9018 DACs. At the same time, the HIFIMAN 901 uses a professional op amp chip model that is also more advanced than the Hi-Fi handset, and the number is even higher. They are two OPA2107s and two OPA627s.
As shown in the above figure, from the ES9018K2M to the ES9028Q2M/C2M, the distance is gradually shortened compared to the ES9018S on key specifications. On the other hand, the new ES9038PRO chip continues to make breakthroughs in key indicators, and DNR and THD+N are elevated to new heights. .
On the other hand, back to the three mainstream chip solutions of Hi-Fi handsets, independent DACs and DACs with integrated op-amp chips are generally better in terms of sound quality than codec solutions, which saves the integration of the internal space of the fuselage. The DAC chip of the op amp will become the mainstream solution in the future and it will be used in Hi-Fi handsets.
In the end, in a short period of time, Hi-Fi chips that perform better and have a higher level of integration generally perform worse on battery life and heat. This is an inevitable bottleneck. Just as the 4K video is recorded and decoded, the power consumption of the mobile phone is very low. And fever will go up as well. Better sound quality and more outstanding image quality will definitely need to pay a price.
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