MA221ADY 1/2-inch Preamplifier_BSWA Technology Co., Ltd.

MA221ADY 1/2-inch Preamplifier

MA221ADY is 1/2-inch single power supply preamplifier developed by BSWA, which is suitable for MP series 1/2-inch pre-polarized microphones, and can also be used with a dedicated adapter for 1/4-inch pre-polarized microphones.

The main function of the preamplifier is impedance change, since the output impedance of the microphone is above GΩ, it cannot be directly connected to the common data acquisition equipment. The high input impedance and low output impedance of the preamplifier can reduce the output impedance of the microphone to less than 100 Ω.

MA221ADY does not provide polarization voltage, so it is only applicable to pre-polarized microphones. It powered by single power supply with built-in low-pass filter, suitable for applications focused on low-frequency acoustic measurement (the cut-off frequency of built-in low-pass filter can be modified to meet the requirement of user application). The output signal has a bias voltage of +2.5 V, suitable for analog-to-digital converter which also powered by a single power supply.

MA221ADY is designed as direct cable output with 1 m length of supplied cable. Users can customize the wire length and output connector.

Features:

● Fit to 1/2-inch prepolarized microphone

● Powered by single power supply

● Built-in 8th order low-pass filter

● Frequency response: 2.5 Hz ~ 12.5 kHz (±0.5 dB)

● Attenuation: 0.3 dB (typ.)

● Wide operating temperature range: -40 °C ~ 100 °C

● Optional additional signal attenuation to adapt to data acquisition devices

● Direct cable output with user-defined output connector

Applications:

● Dedicated preamplifier with built-in filter

Specifications:

Diameter 1/2"

Polarization Voltage Support 0V (Prepolarized)

Frequency Response (Hz) ¹ 4 ~ 10 k (±0.2dB)，2.5 ~12.5 k (±0.5dB)

Attenuation (dB) ² 0.3 (typ.)

Maximum Output Voltage (Vp) ±2.5

Self-generated Noise ² A-weighted <20 μV (15 μV typ.)

20 Hz ~ 20 kHz <40 μV (23 μV typ.)

Input Impedance (GΩ ǁ pF) 15 ǁ 0.45

Output Impedance (Ω) < 30

Power Supply DC power supply: 10 V ~ 20 V (difference between PWR and PWR GND), 30mA

DC Bias Voltage (V) 2.5

Operating Temperature Range (°C) ³ -40 ~ 100

Operating Humidity Range (%RH) 0 ~ 95

Dimensions (mm) Ø12.7 × 53.8

Mounting Thread for Microphone 11.7 mm-60 UNS

Output Connector Direct cable output with user-defined output connector (at least 3 wire: PWR, PWR GND and SIG, optional SIG GND)

Weight (g) 22 (without cable and connector)

TEDS No

Note 1: Measured with a built-in 10 kHz low-pass filter.
Note 2: Measured with the built-in attenuator bypassed. When used with microphones of different sensitivities, the dynamic range of microphone set can be adjusted through the built-in attenuator.
Note 3: Although the preamplifier has been tested to reliably operate between -40 °C~100 °C, it should be noted whether the microphone used can also operate within this temperature range.
Note: Unless specified otherwise, all values were measured at 23 °C, 101.3 kPa, 50 %RH by using 1 meters cable, 15 V power supply and microphone capacitance of 15 pF.

Diameter	1/2"
Polarization Voltage Support	0V (Prepolarized)
Frequency Response (Hz) ¹	4 ~ 10 k (±0.2dB)，2.5 ~12.5 k (±0.5dB)
Attenuation (dB) ²	0.3 (typ.)
Maximum Output Voltage (Vp)	±2.5
Self-generated Noise ²	A-weighted	<20 μV (15 μV typ.)
20 Hz ~ 20 kHz	<40 μV (23 μV typ.)
Input Impedance (GΩ ǁ pF)	15 ǁ 0.45
Output Impedance (Ω)	< 30
Power Supply	DC power supply: 10 V ~ 20 V (difference between PWR and PWR GND), 30mA
DC Bias Voltage (V)	2.5
Operating Temperature Range (°C) ³	-40 ~ 100
Operating Humidity Range (%RH)	0 ~ 95
Dimensions (mm)	Ø12.7 × 53.8
Mounting Thread for Microphone	11.7 mm-60 UNS
Output Connector	Direct cable output with user-defined output connector (at least 3 wire: PWR, PWR GND and SIG, optional SIG GND)
Weight (g)	22 (without cable and connector)
TEDS	No
Note 1: Measured with a built-in 10 kHz low-pass filter. Note 2: Measured with the built-in attenuator bypassed. When used with microphones of different sensitivities, the dynamic range of microphone set can be adjusted through the built-in attenuator. Note 3: Although the preamplifier has been tested to reliably operate between -40 °C~100 °C, it should be noted whether the microphone used can also operate within this temperature range. Note: Unless specified otherwise, all values were measured at 23 °C, 101.3 kPa, 50 %RH by using 1 meters cable, 15 V power supply and microphone capacitance of 15 pF.

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MA221ADY 1/2-inch Preamplifier Brife