BM20 datasheet(21/46 Pages) MICROCHIP

21 / 46 page

Stereo Module

 2015 Microchip Technology Inc.

Page 21

Preliminary Edition

Table 3-7: AUDIO CODEC DIGITAL TO ANALOGUE CONVERTER

T= 25

oC, V

dd=3.0V, 1KHz sine wave input, Bandwidth = 20Hz~20KHz

Parameter (Condition)

Min.

Typ.

Max.

Unit

Over-sampling rate

128

Resolution

Bits

Output Sample Rate

KHz

Signal to Noise Ratio Note: 1

(SNR @cap-less mode) for 48kHz

Signal to Noise Ratio Note: 1

(SNR @single-end mode) for 48kHz

Digital Gain

-54

4.85

Digital Gain Resolution

2~6

Analog Gain

-28

Analog Gain Resolution

Output Voltage Full-scale Swing (AVDD=2.8V) Note:3

742.5

mV rms

Maximum Output Power (16

Ω load)

34.5

Maximum Output Power (32

Ω load)

17.2

Allowed Load

Resistive

O.C.

Capacitive

500

THD+N (16Ω load)

0.05

Signal to Noise Ratio (SNR @ 16Ωload)

Note:

(1) fin=1KHz, B/W=20~20KHz, A-weighted, THD+N < 0.01%, 0dBFS signal, Load=100KΩ

(2) These parameters are characterized but not tested in manufacturing.

(3) Vdd, AVDD are generated by internal LDO

Table 3-8: TRANSMITTER SECTION FOR BDR AND EDR

Parameter

Min

Typ

Max

Bluetooth

specification

Unit

Maximum RF transmit power

3.0

4.0

-6 to 4

dBm

EDR/BDR

Relative transmit power

-4

-1.2

-4 to 1

Note:

The RF Transmit power is calibrated during production using MP Tool software and MT8852 Bluetooth Test

equipment.

Test condition: VCC_RF= 1.28V, temperature=25 ºC.

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