The BK9520 series is a chipset for wireless microphones, including transmitting chip BK9521 and receiving chip BK9522,. Each chip covers V-segment 160~270MHz and U-segment 500 and 980MHz.
Features of transmitter chip BK9521
Maximum transmit power: 14 dBm (VHF)，10 dBm (UHF))
Microphone gain adjustment range: 0–47.5 dB, 0.5 dB/step
Audio AGC and limiting
Dedicated GPIO indicating transmitted audio signal strength (GPIO3)
Package: 4 x 4 mm, 32-pin QFN
Features of receiver chip BK9522
RX sensitivity: -96 dBm (VHF), -96 dBm (UHF)
Dual antenna diversity, automatic antenna select
RF AGC and AFC
Dedicated GPIO indicating received audio signal strength, dedicated GPIO indicating the synchronization status of
transmission and reception
Digital mute
8-band audio equalizer
Active anti-howling
Package:
- 4 x 4 mm, 32-pin QFN
- 5 x 5 mm, 40-pin QFN
Features of the chip set:
Supports external PCM digital audio interface (mono)
Recommended operating voltage: 2.8–3.6 V (The operating voltage can be as low as 2.2 V, but the chip performance will
be worse.)
Operating frequency: 160–270 MHz (VHF), 500–980 MHz (UHF)
Crystal frequency: 24.576 MHz, crystal adjustment range: +/-20 ppm
Digital modulation method: pi/4 DQPSK; occupied bandwidth: 300 kHz; transmission rate 204.8 ksps
Delay: less than 3 ms from microphone input to audio output (48 kHz sampling rate, anti-howling disabled)
Audio signal-to-noise ratio: 96 dB, frequency response: 30 Hz –20 kHz
One-byte dedicated data channel: 7 kbps, internal CRC check, audio and data are transmitted using 32-bit encrypted words
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