CXAR41329 is a preamplifier chip specially designed for MEMS microphone system. It has excellent noise control capability, flexible bias voltage and gain adjustment functions, and wide operating voltage range, and can adapt to a variety of MEMS microphone modules, meet the needs of audio signal amplification in different application scenarios. The chip not only performs well in performance, but also has obvious advantages in reliability and integration. It is suitable for high-demand consumer electronics and professional audio equipment.
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[ CXAR41329 ]"
CXAR41329: high performance and low noise MEMS microphone pre-amplifier details
In modern audio acquisition systems, MEMS microphones are widely used in smart phones, audio equipment, conference systems, smart homes and other fields due to their advantages of small size, stable performance and low power consumption. As one of the core components of MEMS microphone system, the performance of preamplifier directly determines the quality of audio signal acquisition. This article describes in detail by JTM-IC (official website:jtm-ic.com) launched CXAR41329-a high-performance, low-noise, analog-output MEMS microphone pre-amplifier, and deeply analyzed its characteristics, parameters and applications.
I. Product Overview
CXAR41329 is a preamplifier chip specially designed for MEMS microphone system. It has excellent noise control capability, flexible bias voltage and gain adjustment functions, and wide operating voltage range, and can adapt to a variety of MEMS microphone modules, meet the needs of audio signal amplification in different application scenarios. The chip not only performs well in performance, but also has obvious advantages in reliability and integration. It is suitable for high-demand consumer electronics and professional audio equipment.
II. Main features
· Wide operating voltage range: 1.6V ~ 3.6V, suitable for various power supply environments.
· Adjustable bias voltage: 7.5V ~ 16V, step 0.3V, provide flexible MEMS bias support.
· Adjustable gain margin:-4.0dB ~ 11dB, step 0.5dB to adapt to different signal strengths.
· Wide Frequency response: 20Hz ~ 20kHz, covering the audible range of human ears.
· Low input noise: 4μvrms (about-108dBV) to ensure signal purity.
· High output capability: The maximum output voltage is 550mVrms (%).
· Double bias output port: supports multiple microphones or differential structures.
· Low power consumption design: typical work current 125μa, suitable for portable devices.
3. PIN structure and function description
CXAR41329 adopts a compact package, the chip size is only 570μm × μm, and it is equipped with 6 functional pins:
| PIN number | Symbol | Function description |
|---|---|---|
| 1 | VDD | Positive electrode of power supply |
| 2 | OUT | Preamplifier output |
| 3 | GND | Power ground |
| 4 | BIAS1 | First bias voltage output |
| 5 | MICIN | Microphone signal input |
| 7 | BIAS2 | Second bias voltage output |
The pin layout is reasonable, which is convenient for PCB design and system integration.
IV. Working conditions and electrical characteristics
4.1. Extreme working conditions
| Parameter | Symbol | Scope | Unit |
|---|---|---|---|
| Power supply voltage | VDD | -0.3V to 4.2V | V |
| Input voltage | VIN | -0.4V to 0.4V | V |
| Operating temperature | Topr | -40 ℃ ~ 85 ℃ | ℃ |
| Storage Temperature | tstg | -40 ℃ ~ 125 ℃ | ℃ |
Note: working under extreme conditions for a long time may affect the device life. It is recommended to use it under recommended conditions.
4.2. Recommended working conditions
·Power supply voltage: 1.6V to 3.6V
4.3. Summary of electrical characteristics
| Parameter | Symbol | Condition | Typical value | Unit |
|---|---|---|---|---|
| Work current | I₀₀ | - | 125 | ΜA |
| Bias voltage | VBIASBIAS | OTP adjustable, default 7.5V | 7.5~16 | V |
| Gain | VGG | OTP adjustable. Default value: 3.5dB | -4~11 | dB |
| Total harmonic distortion | THD | VIN=50mVrms | 0.2 | % |
| Maximum output voltage | Vout,maxout,max | THD<10% | 550 | mVrms |
| Output impedance | ZOUTOUT | @ 1kHz | 180~250 | Ω |
| Power supply rejection ratio | PSRR | 100mVpp @ 1kHz | -70 | dB |
V. Application scenarios and circuit design
5.1 CXAR41329 is applicable to various audio front-end systems, including:
· Smartphones and tablets
· Bluetooth headset and microphone module
· Conference system and voice assistant
· Smart home audio collection
· Vehicle-mounted voice recognition system
5.2. Typical application circuit diagram:
MEMS microphone & rarr; MICIN & rarr; CXAR41329 & rarr; OUT & rarr; Back-end processor
↑ ↑
BIAS1/BIAS2
Note:
·Use OTP (one-time programmable) memory to adjust the bias voltage and gain.
·We recommend that you connect the output terminal to a load capacitor below 100pF to avoid signal distortion.
·The power supply should enhance filtering to improve PSRR performance.
VI. Summary of design advantages
CXAR41329 provides powerful signal conditioning capabilities for MEMS microphone systems due to its high integration, low noise, adjustable bias and gain. Its small size and low power consumption are especially suitable for the needs of modern portable devices. JTM-IC (jtm-ic.com) as a professional integrated circuit supplier, it continuously provides customers with high-performance and high-reliability audio solutions.
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