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
ParameterMin.Typ.Max.Unit
Ambient temperature under bias-40—+85°C
Storage temperature-40—+150°C
Battery input voltage (BAT_IN) ——+4.3V
Adapter input voltage (ADAP_IN) ——+7V
Maximum output current sink by any I/O pin——12mA
Maximum output current sourced by any I/O pin——12mA
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)
ParameterMin.Typ.Max.Unit
Battery input voltage (BAT_IN) 3.23.84.2V
Adapter input voltage (ADAP_IN)(2)4.555.5V
Operation temperature (TOPERATION)-40+25+85ºC
  1. The recommended operating condition tables reflect a typical voltage usage for the device.
  2. 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)
ParameterMin.Typ.Max.Unit
I/O supply voltage (VDD_IO)3.03.33.6V
I/O voltage levels
VIL input logic levels low0—0.8V
VIH input logic levels high2.0—3.6V
VOL output logic levels low——0.4V
VOH output logic levels high2.4——V
RST_NInput low to high threshold point——1.87V
Input high to low threshold point1.25——V
Threshold voltage—1.6—V
  1. These parameters are characterized, but not tested on production device.
Table 9-4. Battery Charger (1)
ParameterMin.Typ.Max.Unit
Adapter input voltage (ADAP_IN)4.6(2)5.05.5V
Supply current to charger only—34.5mA
Maximum battery fast charge currentHeadroom(3) > 0.7V (ADAP_IN = 5V)—350—mA
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—%
  1. These parameters are characterized, but not tested on production devices.
  2. More time is required to get the battery fully charged when ADAP_IN = 4.5V.
  3. Headroom = VADAP_IN – VBAT_IN.
  4. When VADAP_IN – VBAT_IN > 2V, the maximum fast charge current is 175 mA for thermal protection.
Table 9-5. SAR ADC Operating Conditions
ParameterConditionMin.Typ.Max.Unit
Shutdown current (IOFF)PDI_ADC = 1——1μA
Resolution——10—bits
Effective Number of Bits (ENOB)—78—bits
SAR core clock (FCLOCK)——0.51MHz
Conversion time per channel (TCONV)10 FCLOCK cycles1020—μs
Offset error (EOFFSET)—-5—+5%
Gain error (EGAIN)———+1%
ADC SAR core power-up (tPU)PDI_ADC transitions from 1 to 0——500ns
Input voltage range (VIN)Channel 8 (SK2 Pin)0.25—1.4V
Channel 9 (SK1 Pin)0.25—1.4V
Channel 10 (OTP)0.25—1.4V
Channel 11 (ADAP_IN Pin)2.25—12.6V
Channel 12 (BAT_IN Pin)1.0—5.6V
Table 9-6. LED Driver (1)
ParameterMin.Typ.Max.Unit
Open-drain voltage——3.6V
Programmable current range0—5.25mA
Intensity control—16—step
Current step—0.35—mA
Power-down open-drain current——1μA
Shutdown current——1μA
  1. 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——16Bit
Output sample rate8—48kHz
SNR ratio(2) (at MIC or Line-In)—91—dB
Digital gain-54—4.85dB
Digital gain resolution—2 to 6—dB
MIC boost gain—20—dB
Analog gain——60dB
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
  1. These parameters are characterized, but not tested on production devices.
  2. T = 25°C, VDD = 1.8V, 1 kHz sine wave input, bandwidth = 20 Hz to 20 kHz.
  3. fin = 1 kHz sine tone, analog gain = -3 dB, digital gain = 0 dB, bandwidth = 22K, A-weighted, sweep across -100 dBv to 6 dBv.
  4. 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
Resolution16—20Bit
Output sample rate8—48kHz
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—4.85dB
Digital gain resolution—2 to 6—dB
Analog gain-28—3dB
Analog gain resolution—1—dB
Output voltage full-scale swing (AVDD = 1.8V)495742.5—mV/rms
Maximum output power (16Ω load)—34.5—mW
Maximum output power (32Ω load)—17.2—mW
Allowed loadResistive16——Ω
Capacitive——500pF
THD Ratio (3)0.150.020.05%
THD Ratio (3)-75-70-65dB
THD+N Ratio (3)0.030.040.05%
THD+N Ratio (3)-72-70-65dB
SNR ratio (at 16Ω load) (4)—95—dB
  1. These parameters are characterized, but not tested on production devices.
  2. T = 25°C, VDD = 1.8V, 1 kHz sine wave input, bandwidth = 20 Hz to 20 kHz.
  3. fin=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)
  4. fin = 1 kHz, bandwidth = 20 Hz to 20 kHz, A-weighted, -1 dBFS signal, load =16Ω.
  5. 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 SpecificationMin.Typ.Max.Unit
Transmit power BDR0 to 20—10.4—dBm
Transmit power EDR 2M0 to 20—9.2—dBm
Transmit power EDR 3M0 to 20—9.2—dBm
  1. These parameters are characterized, but not tested on production devices.
  2. The RF transmit power is the average power measured for the mid-channel (Channel 39).
  3. The RF transmit power is calibrated during production using the MP tool and MT8852 Bluetooth test equipment.
  4. 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 SpecificationMin.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
  1. These parameters are characterized, but not tested on production devices.
  2. The RF transmit power is the average power measured for the mid-channel (Channel 39).
  3. The RF transmit power is calibrated during production using the MP tool and MT8852 Bluetooth test equipment.
  4. Test condition: VCC_RF = 1.28V, temperature +25ºC.
Table 9-11. Receiver Section for BDR/EDR/Bluetooth Low Energy(1,2)
ParameterBluetooth SpecificationModulationMin.Typ.Max.Unit
Sensitivity at 0.1% BER≤-70GFSK—-88—dBm
Sensitivity at 0.01% BER≤-70π/4 DQPSK—-90—dBm
≤-708 DPSK—-84—dBm
Sensitivity at 0.1% BER≤-70Bluetooth Low Energy—-92—dBm
  1. These parameters are characterized, but not tested on production devices.
  2. Test condition: VCC_RF = 1.28V with temperature +25ºC.
Table 9-12. BM83 System Current Consumption(1,2,3,6,7,8)
ModesConditionRolePacket TypeCurrent (Typ.)Unit
A2DP mode Internal codec, iOS CentralPeripheral2DH5/3DH512.05mA
Internal codec, Android™ PeripheralCentral3DH512.32mA
Sniff mode(4) Internal codec, Bluetooth Low Energy disabledPeripheralDM1548µA
Central2DH1/3DH1555µA
Internal codec, Bluetooth Low Energy enabledPeripheralDM1832µA
Central2DH1/3DH1863µA
SCO/eSCO connectionMute at both far end and near endPeripheral2EV314.1mA
Central2EV313.94mA
Inquiry Scan Bluetooth Low Energy disabled──1.35mA
Bluetooth Low Energy enabled──1.70mA
Standby mode System offPeripheral─2.81µA
Central─2.85µA
RF modes(5)Continuous TX modeModulation OFF, PL0─59mA
Modulation ON, PL0─30mA
Modulation OFF, PL2─35.5mA
Modulation ON, PL2─22mA
Continuous RX modePacket count disable─49mA
Packet count enable─38.5mA
  1. VBAT_IN = 3.8V; current measured across BAT_IN.
  2. BM83 module (mounted on BM83 Carrier Board) configured in standalone mode (internal codec) with SBC, used for measurements; no LEDs, no speaker load.
  3. iPhone®6 (iOS v12.2) and OnePlus6 (Android Oxygen version 9.0.3) used for measurements.
  4. Auto-unsniff mode is disabled. Sniff interval is 500 ms by default; observed time to enter sniff mode is approximately 20 secs.
  5. RF TX power is set to 10 dBm.
  6. Current measurements average over a period of 120 secs.
  7. Distance between DUT (BM83) and Bluetooth source (smartphone) is 30 cms.
  8. All measurements are taken inside a shield room.