The TPA2012D2 is a stereo, filter-free, Class-D audio amplifier (Class-D amp) available in a DSBGA or WQFN package. The TPA2012D2 only requires two external components for operation.
The TPA2012D2 features independent shutdown controls for each channel. The gain can be selected to 6, 12, 18, or 24 dB using the G0 and G1 gain select pins. High PSRR and differential architecture provide increased immunity to noise and RF rectification. In addition to these features, a fast start-up time and small package size make the TPA2012D2 class-D amp an ideal choice for both cellular handsets and PDAs.
The TPA2012D2 is capable of driving 1.4 W/Ch at
5 V or 720 mW/Ch at 3.6 V into 8 Ω. The TPA2012D2 is also capable of driving 4 Ω. The TPA2012D2 is thermally limited in DSBGA and may not achieve
2.1 W/Ch for 4 Ω. The maximum output power in the DSBGA is determined by the ability of the circuit board to remove heat. Figure 33 shows thermally limited region of the DSBGA in relation to the WQFN package. The TPA2012D2 provides thermal and short-circuit protection.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPA2012D2 | DSBGA (16) | 2.01 mm × 2.01 mm |
WQFN (20) | 4.00 mm × 4.00 mm |
Changes from E Revision (September 2016) to F Revision
Changes from D Revision (June 2008) to E Revision
DEVICE NO. | SPEAKER AMP TYPE | SPECIAL FEATURE | OUTPUT POWER (M) | PSRR (dB) |
---|---|---|---|---|
TPA2012D2 | Class D | — | 2.1 | 71 |
TPA2016D2 | Class D | AGC/DRC | 2.8 | 80 |
TPA2026D2 | Class D | AGC/DRC | 3.2 | 80 |
PIN | I/O | DESCRIPTION | ||
---|---|---|---|---|
NAME | DSBGA | WQFN | ||
AGND | C3 | 18 | I | Analog ground |
AVDD | D2 | 9 | I | Analog supply (must be same voltage as PVDD) |
G0 | C2 | 15 | I | Gain select (LSB) |
G1 | B2 | 1 | I | Gain select (MSB) |
INL– | B1 | 19 | I | Left channel negative input |
INL+ | A1 | 20 | I | Left channel positive input |
INR– | C1 | 17 | I | Right channel negative input |
INR+ | D1 | 16 | I | Right channel positive input |
NC | — | 6, 10 | — | No internal connection |
OUTL– | A4 | 5 | O | Left channel negative differential output |
OUTL+ | A3 | 2 | O | Left channel positive differential output |
OUTR– | D4 | 11 | O | Right channel negative differential output |
OUTR+ | D3 | 14 | O | Right channel positive differential output |
PGND | C4 | 4, 12 | I | Power ground |
PVDD | A2 | 3, 13 | I | Power supply (must be same voltage as AVDD) |
SDL | B4 | 7 | I | Left channel shutdown terminal (active low) |
SDR | B3 | 8 | I | Right channel shutdown terminal (active low) |
Thermal Pad | — | — | — | Connect the thermal pad of WQFN package to PCB GND |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Supply voltage, VSS (AVDD, PVDD) | Active mode | –0.3 | 6 | V |
Shutdown mode | –0.3 | 7 | ||
Input voltage, VI | –0.3 | VDD + 0.3 | V | |
Continuous total power dissipation | See Dissipation Rating Table | |||
Operating junction temperature, TJ | –40 | 150 | °C | |
Storage temperature, Tstg | –65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±2000 | V |
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±1500 |
MIN | MAX | UNIT | ||
---|---|---|---|---|
VSS | Supply voltage, AVDD, PVDD | 2.5 | 5.5 | V |
VIH | High-level input voltage, SDL, SDR, G0, G1 | 1.3 | V | |
VIL | Low-level input voltage, SDL, SDR, G0, G1 | 0.35 | V | |
TA | Operating free-air temperature | –40 | 85 | °C |
THERMAL METRIC(1) | TPA2012D2 | UNIT | ||
---|---|---|---|---|
YZH (DSBGA) | RTJ (WQFN) | |||
16 PINS | 20 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 71.4 | 34.6 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 0.4 | 34.3 | °C/W |
RθJB | Junction-to-board thermal resistance | 14 | 11.5 | °C/W |
ψJT | Junction-to-top characterization parameter | 1.8 | 0.4 | °C/W |
ψJB | Junction-to-board characterization parameter | 13.3 | 11.6 | °C/W |
RθJC(bot) | Junction-to-case (bottom) thermal resistance | — | 3.2 | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|---|---|
|VOO| | Output offset voltage (measured differentially) | Inputs ac grounded, AV = 6 dB, VDD = 2.5 to 5.5 V | 5 | 25 | mV | ||
PSRR | Power supply rejection ratio | VDD = 2.5 to 5.5 V | –75 | –55 | dB | ||
Vicm | Common-mode input voltage | 0.5 | VDD – 0.8 | V | |||
CMRR | Common-mode rejection ration | Inputs shorted together, VDD = 2.5 to 5.5 V | –69 | –50 | dB | ||
|IIH| | High-level input current | VDD = 5.5 V, VI = VDD | 50 | µA | |||
|IIL| | Low-level input current | VDD = 5.5 V, VI = 0 V | 5 | µA | |||
IDD | Supply current | VDD = 5.5 V, no load or output filter | 6 | 9 | mA | ||
VDD = 3.6 V, no load or output filter | 5 | 7.5 | |||||
VDD = 2.5 V, no load or output filter | 4 | 6 | |||||
Shutdown mode | 1.5 | µA | |||||
rDS(on) | Static drain-source on-state resistance | VDD = 5.5 V | 500 | mΩ | |||
VDD = 3.6 V | 570 | ||||||
VDD = 2.5 V | 700 | ||||||
Output impedance in shutdown mode | V(SDR, SDL)= 0.35 V | 2 | kΩ | ||||
f(sw) | Switching frequency | VDD = 2.5 V to 5.5 V | 250 | 300 | 350 | kHz | |
Closed-loop voltage gain | G0, G1 = 0.35 V | 5.5 | 6 | 6.5 | dB | ||
G0 = VDD, G1 = 0.35 V | 11.5 | 12 | 12.5 | ||||
G0 = 0.35 V, G1 = VDD | 17.5 | 18 | 18.5 | ||||
G0, G1 = VDD | 23.5 | 24 | 24.5 | ||||
OPERATING CHARACTERISTICS, RL = 8 Ω | |||||||
PO | Output power (per channel) | RL = 8 Ω | VDD = 5 V, f = 1 kHz, THD = 10% |
1.4 | W | ||
VDD = 3.6 V, f = 1 kHz, THD = 10% |
0.72 | ||||||
RL = 4 Ω | VDD = 5 V, f = 1 kHz, THD = 10% |
2.1 | |||||
THD+N | Total harmonic distortion plus noise | PO = 1 W, VDD = 5 V, AV = 6 dB, f = 1 kHz | 0.14% | ||||
PO = 0.5 W, VDD = 5 V, AV = 6 dB, f = 1 kHz | 0.11% | ||||||
Channel crosstalk | f = 1 kHz | –85 | dB | ||||
kSVR | Supply ripple rejection ratio | VDD = 5 V, AV = 6 dB, f = 217 Hz | –77 | dB | |||
VDD = 3.6 V, AV = 6 dB, f = 217 Hz | –73 | ||||||
CMRR | Common mode rejection ratio | VDD = 3.6 V, VIC = 1 Vpp, f = 217 Hz | –69 | dB | |||
Input impedance | Av = 6 dB | 28.1 | kΩ | ||||
Av = 12 dB | 17.3 | ||||||
Av = 18 dB | 9.8 | ||||||
Av = 24 dB | 5.2 | ||||||
Start-up time from shutdown | VDD = 3.6 V | 3.5 | ms | ||||
Vn | Output voltage noise | VDD = 3.6 V, f = 20 to 20 kHz, inputs are ac grounded, AV = 6 dB |
No weighting | 35 | µV | ||
A weighting | 27 |
PACKAGE | TA = 25°C POWER RATING(1) |
DERATING FACTOR |
TA = 75°C POWER RATING |
TA = 85°C POWER RATING |
---|---|---|---|---|
RTJ | 5.2 W | 41.6 mW/°C | 3.12 W | 2.7 W |
YZH | 1.2 W | 9.12 mW/°C | 690 mW | 600 mW |
All parameters are measured according to the conditions described in the Specifications. Figure 34 shows the setup used for the typical characteristics of the test device.
The TPA2012D2 is capable of driving 1.4 W/Ch at 5-V or 720 mW/Ch at 3.6-V into 8 Ω. The TPA2012D2 is also capable of driving a load of 4 Ω.
The TPA2012D2 feature independent shutdown controls for each channel. High PSRR and differential architecture provide increased immunity to noise and RF rectification. The TPA2012D2 provides thermal and short-circuit protection.
The TPA2012D2 has 4 selectable fixed gains: 6 dB, 12 dB, 18 dB, and 24 dB. Connect the G0 and G1 pins as shown in Table 1.
G1 | G0 | GAIN (V/V) |
GAIN (dB) |
INPUT IMPEDANCE (RI, kΩ) |
---|---|---|---|---|
0 | 0 | 2 | 6 | 28.1 |
0 | 1 | 4 | 12 | 17.3 |
1 | 0 | 8 | 18 | 9.8 |
1 | 1 | 16 | 24 | 5.2 |
TPA2012D2 goes to low duty cycle mode when a short-circuit event happens. To return to normal duty cycle mode, the device must be reset. The shutdown mode can be set through the SDL and SDR pins, or the device can be turned off and turned on to return to normal duty cycle mode. This feature protects the device without affecting long-term reliability.
In using Class-D amplifiers with CODECs and DACs, sometimes there is an increase in the output noise floor from the audio amplifier. This occurs when mixing of the output frequencies of the CODEC and DAC mix with the switching frequencies of the audio amplifier input stage. The noise increase can be solved by placing a low-pass filter between the CODEC, DAC, and audio amplifier. This filters off the high frequencies that cause the problem and allow proper performance. The recommended resistor value is 100 Ω and the capacitor value of 47 nF. Figure 35 shows the typical input filter.
A ferrite bead filter can often be used if the design is failing radiated emissions without an LC filter and the frequency sensitive circuit is greater than 1 MHz. This filter functions well for circuits that just have to pass FCC and CE because FCC and CE only test radiated emissions greater than 30 MHz. When choosing a ferrite bead, choose one with high impedance at high frequencies, and very low impedance at low frequencies. In addition, select a ferrite bead with adequate current rating to prevent distortion of the output signal.
Use an LC output filter if there are low frequency (< 1 MHz) EMI sensitive circuits and/or there are long leads from amplifier to speaker.
Figure 36 shows typical ferrite bead and LC output filters.
The TPA2012D2 amplifier can be put in shutdown mode when asserting SDR and SDL pins to a logic LOW. While in shutdown mode, the device output stage is turned off and the current consumption is very low.