9 Electrical Specifications

This section provides an overview of the BM83 stereo audio module electrical characteristics. The following table provides the absolute maximum ratings for the BM83 module.

Table 9-1. **Absolute Maximum Ratings**
Parameter	Min.	Typ.	Max.	Unit
Ambient temperature under bias	-40	—	+85	°C
Storage temperature	-40	—	+150	°C
Battery input voltage (BAT_IN)	—	—	+4.3	V
Adapter input voltage (ADAP_IN)	—	—	+7	V
Maximum output current sink by any I/O pin	—	—	12	mA
Maximum output current sourced by any I/O pin	—	—	12	mA

CAUTION: Stresses listed in the preceding table cause permanent damage to the device. This is a stress rating only. The functional operation of the device at those or any other conditions and those indicated in the operation listings of this specification are not implied. Exposure to maximum rating conditions for extended periods affects device reliability.

The following tables provide the recommended operating conditions and the electrical specifications of the BM83 module.

Table 9-2. Recommended Operating Conditions ⁽¹⁾
Parameter	Min.	Typ.	Max.	Unit
Battery input voltage (BAT_IN)	3.2	3.8	4.2	V
Adapter input voltage (ADAP_IN)⁽²⁾	4.5	5	5.5	V
Operation temperature (T_OPERATION)	-40	+25	+85	ºC

The recommended operating condition tables reflect a typical voltage usage for the device.
ADAP_IN is recommended to be used to charge the battery in battery-powered applications and/or applications with USB functionality; otherwise, ADAP_IN can be left floating.

Table 9-3. I/O and Reset Level ⁽¹⁾
Parameter		Min.	Typ.	Max.	Unit
I/O supply voltage (VDD_IO)		3.0	3.3	3.6	V
I/O voltage levels
VIL input logic levels low		0	—	0.8	V
VIH input logic levels high		2.0	—	3.6	V
VOL output logic levels low		—	—	0.4	V
VOH output logic levels high		2.4	—	—	V
RST_N	Input low to high threshold point	—	—	1.87	V
RST_N	Input high to low threshold point	1.25	—	—	V
Threshold voltage		—	1.6	—	V

These parameters are characterized, but not tested on production device.

Table 9-4. Battery Charger ⁽¹⁾
Parameter		Min.	Typ.	Max.	Unit
Adapter input voltage (ADAP_IN)		4.6⁽²⁾	5.0	5.5	V
Supply current to charger only		—	3	4.5	mA
Maximum battery fast charge current	Headroom⁽³⁾ > 0.7V (ADAP_IN = 5V)	—	350	—	mA
Maximum battery fast charge current	Headroom = 0.3V to 0.7V (ADAP_IN = 4.5V)	—	175⁽⁴⁾	—	mA
Trickle charge voltage threshold		—	3	—	V
Battery charge termination current (% of fast charge current)		—	10	—	%

These parameters are characterized, but not tested on production devices.
More time is required to get the battery fully charged when ADAP_IN = 4.5V.
Headroom = VADAP_IN – VBAT_IN.
When VADAP_IN – VBAT_IN > 2V, the maximum fast charge current is 175 mA for thermal protection.

Table 9-5. SAR ADC Operating Conditions
Parameter	Condition	Min.	Typ.	Max.	Unit
Shutdown current (I_OFF)	PDI_ADC = 1	—	—	1	μA
Resolution	—	—	10	—	bits
Effective Number of Bits (ENOB)	—	7	8	—	bits
SAR core clock (F_CLOCK)	—	—	0.5	1	MHz
Conversion time per channel (T_CONV)	10 F_CLOCK cycles	10	20	—	μs
Offset error (E_OFFSET)	—	-5	—	+5	%
Gain error (E_GAIN)	—	—	—	+1	%
ADC SAR core power-up (t_PU)	PDI_ADC transitions from 1 to 0	—	—	500	ns
Input voltage range (V_IN)	Channel 8 (SK2 Pin)	0.25	—	1.4	V
	Channel 9 (SK1 Pin)	0.25	—	1.4	V
	Channel 10 (OTP)	0.25	—	1.4	V
	Channel 11 (ADAP_IN Pin)	2.25	—	12.6	V
	Channel 12 (BAT_IN Pin)	1.0	—	5.6	V

Table 9-6. LED Driver ⁽¹⁾
Parameter	Min.	Typ.	Max.	Unit
Open-drain voltage	—	—	3.6	V
Programmable current range	0	—	5.25	mA
Intensity control	—	16	—	step
Current step	—	0.35	—	mA
Power-down open-drain current	—	—	1	μA
Shutdown current	—	—	1	μA

These parameters are characterized, but not tested on production devices.

Table 9-7. Audio Codec Analog-to-Digital Converter ^(1,4)
Parameter (Condition)	Min.	Typ.	Max.	Unit
Resolution	—	—	16	Bit
Output sample rate	8	—	48	kHz
SNR ratio⁽²⁾ (at MIC or Line-In)	—	91	—	dB
Digital gain	-54	—	4.85	dB
Digital gain resolution	—	2 to 6	—	dB
MIC boost gain	—	20	—	dB
Analog gain	—	—	60	dB
Analog gain resolution	—	2.0	—	dB
Input full-scale at maximum gain (differential)	—	4	—	mV/rms
Input full-scale at minimum gain (differential)	—	800	—	mV/rms
3 dB bandwidth	—	20	—	kHz
Microphone mode (input impedance)	—	24	—	kΩ
THD+N ratio⁽³⁾	—	0.04	—	%
THD+N ratio⁽³⁾	—	-68	—	dB

These parameters are characterized, but not tested on production devices.
T = 25°C, VDD = 1.8V, 1 kHz sine wave input, bandwidth = 20 Hz to 20 kHz.
f_in = 1 kHz sine tone, analog gain = -3 dB, digital gain = 0 dB, bandwidth = 22K, A-weighted, sweep across -100 dBv to 6 dBv.
Measurements performed on the BM83 EVB platform.

Table 9-8. Audio Codec Digital-to-Analog Converter^(1,5)
Parameter (Condition)		Min.	Typ.	Max.	Unit
Over-sampling rate		—	128	—	fs
Resolution		16	—	20	Bit
Output sample rate		8	—	48	kHz
SNR ratio⁽²⁾(at Capless mode) for 48 kHz		—	95	—	dB
SNR⁽²⁾(at Single-ended mode) for 48 kHz		—	95	—	dB
Digital gain		-54	—	4.85	dB
Digital gain resolution		—	2 to 6	—	dB
Analog gain		-28	—	3	dB
Analog gain resolution		—	1	—	dB
Output voltage full-scale swing (AVDD = 1.8V)		495	742.5	—	mV/rms
Maximum output power (16Ω load)		—	34.5	—	mW
Maximum output power (32Ω load)		—	17.2	—	mW
Allowed load	Resistive	16	—	—	Ω
Allowed load	Capacitive	—	—	500	pF
THD Ratio ⁽³⁾		0.15	0.02	0.05	%
THD Ratio ⁽³⁾		-75	-70	-65	dB
THD+N Ratio ⁽³⁾		0.03	0.04	0.05	%
THD+N Ratio ⁽³⁾		-72	-70	-65	dB
SNR ratio (at 16Ω load) ⁽⁴⁾		—	95	—	dB

These parameters are characterized, but not tested on production devices.
T = 25°C, VDD = 1.8V, 1 kHz sine wave input, bandwidth = 20 Hz to 20 kHz.
f_in=1 kHz sine tone, analog gain = -3 dB, digital gain = 0 dB, bandwidth = 22K, A-weighting applied, sweep across -100 dBv to 6 dBv level, with various loads (16Ω, 32Ω, 100 kΩ)
f_in = 1 kHz, bandwidth = 20 Hz to 20 kHz, A-weighted, -1 dBFS signal, load =16Ω.
Measurements performed on the BM83 EVB platform.

Table 9-9. Transmitter Section Class 1 (MPA Configuration) for BDR and EDR^(1,4)
Parameter^(2,3)	Bluetooth Specification	Min.	Typ.	Max.	Unit
Transmit power BDR	0 to 20	—	10.4	—	dBm
Transmit power EDR 2M	0 to 20	—	9.2	—	dBm
Transmit power EDR 3M	0 to 20	—	9.2	—	dBm

These parameters are characterized, but not tested on production devices.
The RF transmit power is the average power measured for the mid-channel (Channel 39).
The RF transmit power is calibrated during production using the MP tool and MT8852 Bluetooth test equipment.
Test condition: VCC_RF = 1.28V, temperature +25ºC.

Table 9-10. Transmitter Section Class 2 (LPA Configuration) for BDR and EDR ^(1,4)
Parameter^(2,3)	Bluetooth Specification	Min.	Typ.	Max.	Unit
Transmit power BDR	-6 to 4	—	2	—	dBm
Transmit power EDR 2M	-6 to 4	—	0.5	—	dBm
Transmit power EDR 3M	-6 to 4	—	0.5	—	dBm

These parameters are characterized, but not tested on production devices.
The RF transmit power is the average power measured for the mid-channel (Channel 39).
The RF transmit power is calibrated during production using the MP tool and MT8852 Bluetooth test equipment.
Test condition: VCC_RF = 1.28V, temperature +25ºC.

Table 9-11. Receiver Section for BDR/EDR/Bluetooth Low Energy^(1,2)
Parameter	Bluetooth Specification	Modulation	Min.	Typ.	Max.	Unit
Sensitivity at 0.1% BER	≤-70	GFSK	—	-88	—	dBm
Sensitivity at 0.01% BER	≤-70	π/4 DQPSK	—	-90	—	dBm
Sensitivity at 0.01% BER	≤-70	8 DPSK	—	-84	—	dBm
Sensitivity at 0.1% BER	≤-70	Bluetooth Low Energy	—	-92	—	dBm

These parameters are characterized, but not tested on production devices.
Test condition: VCC_RF = 1.28V with temperature +25ºC.

Table 9-12. BM83 System Current Consumption^{(1,2,3,6,7,8)}
Modes	Condition	Role	Packet Type	Current (Typ.)	Unit
A2DP mode	Internal codec, iOS Central	Peripheral	2DH5/3DH5	12.05	mA
A2DP mode	Internal codec, Android™ Peripheral	Central	3DH5	12.32	mA
Sniff mode⁽⁴⁾	Internal codec, Bluetooth Low Energy disabled	Peripheral	DM1	548	µA
	Internal codec, Bluetooth Low Energy disabled	Central	2DH1/3DH1	555	µA
	Internal codec, Bluetooth Low Energy enabled	Peripheral	DM1	832	µA
	Internal codec, Bluetooth Low Energy enabled	Central	2DH1/3DH1	863	µA
SCO/eSCO connection	Mute at both far end and near end	Peripheral	2EV3	14.1	mA
SCO/eSCO connection	Mute at both far end and near end	Central	2EV3	13.94	mA
Inquiry Scan	Bluetooth Low Energy disabled	─	─	1.35	mA
Inquiry Scan	Bluetooth Low Energy enabled	─	─	1.70	mA
Standby mode	System off	Peripheral	─	2.81	µA
Standby mode	System off	Central	─	2.85	µA
RF modes⁽⁵⁾	Continuous TX mode	Modulation OFF, PL0	─	59	mA
		Modulation ON, PL0	─	30	mA
		Modulation OFF, PL2	─	35.5	mA
		Modulation ON, PL2	─	22	mA
	Continuous RX mode	Packet count disable	─	49	mA
	Continuous RX mode	Packet count enable	─	38.5	mA

VBAT_IN = 3.8V; current measured across BAT_IN.
BM83 module (mounted on BM83 Carrier Board) configured in standalone mode (internal codec) with SBC, used for measurements; no LEDs, no speaker load.
iPhone^®6 (iOS v12.2) and OnePlus6 (Android Oxygen version 9.0.3) used for measurements.
Auto-unsniff mode is disabled. Sniff interval is 500 ms by default; observed time to enter sniff mode is approximately 20 secs.
RF TX power is set to 10 dBm.
Current measurements average over a period of 120 secs.
Distance between DUT (BM83) and Bluetooth source (smartphone) is 30 cms.
All measurements are taken inside a shield room.