TAS5828M Evaluation Module
1 Trademarks
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2 Hardware Overview
The TAS5828MEVM showcases the latest TI digital input Class-D closed loop amplifier. The TAS5828M is a digital input stereo high-efficiency Closed-Loop Class-D audio amplifier with an advanced Hybrid-Pro algorithm to improve system efficiency and reduce heat without clipping distortion. The TAS5828EVM is a stand-alone EVM, which has an optional battery power supply input with LM5155 boost or external power supply input bypassing the LM5155 boost, USB control via PurePath Control Console 3 (PPC3), and flexible audio input options. The TAS5828MEVM also can be configured using the Hardware control mode that supports setting switching frequency, analog gain, BTL/PBTL mode and Cycle by Cycle current limit threshold through pin configuration. This mode is especially designed to eliminate end system software driver integration efforts.
Figure 2-1 TAS5828MEVM2.1 Features
- TAS5828M Hybrid-Pro algorithm for audio envelope tracking
- Integrates LM5155 boost to provide customer system design reference
- Default system configuration: 5 V battery input, boost to max 16 V power rail based on audio envelope tracking
- Flexible TAS5828M Hybrid-Pro output (HPFB pin) to customer system board capability
- 96-kHz Input Sample Rate Support
- Operates in BTL or PBTL
- Provides flexible input signal routing (USB, Analog, Optical and external I2S)
- Demonstration, Evaluation and Development environment via the PurePath Console 3 software (GUI)
- Optional Hardware control mode to set switching frequency, analog gain, BTL/PBTL mode and Cycle by Cycle current limit through pin configuration
2.2 Functions
The digital audio data input to the TAS5828MEVM is selectable from USB audio, analog, optical and PSIA (external I2S).
2.3 Detailed Operations
The TAS5828MEVM only requires a single supply to operate. Three different audio sources can be selected:
- If XMOS is selected manually by toggling the S2 switch, the Windows Media Player can be used to stream audio.
- If SPDIF is selected manually by toggling the S2 switch, a DVD player with an optical cable or an analog cable can be used to provide audio stream.
- If external digital audio source such as Programmable Serial Interface Adapter (PSIA) from Audio Precision, jumpers can be used to insert external I2S signals.
Both 3.3 V and 1.8 V DVDD and IOVDD are supported with TAS5828MEVM. Jumper (J26) can be used to select accordingly based on requirement.
TAS5828MEVM provides optional onboard LM5155 boost Hybrid-Pro evaluation or external customer system boost with Hybrid-Pro feedback (HPFB pin) control:
- Onboard LM5155 boost Hybrid-Pro evaluation
- 5 V battery power input through J12 and J13. Bypass external PVDD through DNP J18
- TAS5828M PVDD is from LM5155 boost output: J14 - IN, J18 - OUT
- TAS5828M HPFB pin routes to LM5155 FB pin: J15 - IN, J16 - OUT
- External customer system boost with Hybrid-Pro feedback (HPFB
pin) control
- TAS5828M HPFB pin routes for external customer system boost FB control through TP7 FB and TP8 GND: J15 - OUT, J16 - OUT
- Customer system boost output for TAS5828M PVDD through J17 PVDD and J20 GND: J14 - OUT, J18 - IN
The USB connection is also used to provide I2C communications with the two TAS5828M devices on the EVM. The Pure Path Console 3 (PPC3) is the software tool which can initialize and operate this EVM.
Alternatively, the TAS5828M has an optional Hardware Control Mode to set switching frequency, analog gain, BTL/PBTL mode and Cycle by Cycle current limit through pin configuration. Hardware Control Mode can be enable by modifying J8 ADR/HW to HW, J10 SDA/HW_SEL0 to desired mode according to Table 2-2, and J11 SCK/HW_SEL1 to the desired mode according to Table 2-1.
| R10(GND) | R8(DVDD) | FSW&Class D Loop Bandwidth | Cycle By Cycle Current Limit Threshold | Spread Spectrum | Modulation |
|---|---|---|---|---|---|
| 0 Ω | DNP | 768 kHz FSW, 175 kHz BW | CBC Threshold = 80% OCP | Disable | 1SPW |
| 1 kΩ | DNP | 768 kHz FSW, 175 kHz BW | CBC Disable | Disable | 1SPW |
| 4.7 kΩ | DNP | 768 kHz FSW, 175 kHz BW | CBC Threshold = 40% OCP | Disable | 1SPW |
| 15 kΩ | DNP | 768 kHz FSW, 175 kHz BW | CBC Threshold = 60% OCP | Disable | 1SPW |
| DNP | 33 kΩ | 480 kHz FSW, 100 kHz BW | CBC Disable | Enable | BD |
| DNP | 6.8 kΩ | 480 kHz FSW, 100 kHz BW | CBC Threshold = 80% OCP | Enable | BD |
| DNP | 1.5 kΩ | 480 kHz FSW, 100 kHz BW | CBC Threshold = 40% OCP | Enable | BD |
| DNP | 0 Ω | 480 kHz FSW, 100 kHz BW | CBC Threshold = 60% OCP | Enable | BD |
| R11(GND) | R9(DVDD) | Analog Gain | H-Bridge Output Configuration |
|---|---|---|---|
| 0 Ω | DNP | 29.5 VP/FS | BTL |
| 1 kΩ | DNP | 20.9 VP/FS | BTL |
| 4.7 kΩ | DNP | 14.7 VP/FS | BTL |
| 15 kΩ | DNP | 7.4 VP/FS | BTL |
| DNP | 33 kΩ | 7.4 VP/FS | PBTL |
| DNP | 6.8 kΩ | 14.7 VP/FS | PBTL |
| DNP | 1.5 kΩ | 20.9 VP/FS | PBTL |
| DNP | 0 Ω | 29.5 VP/FS | PBTL |
3 Hardware Setup
Software Control Mode
- Connect speakers to TAS5828MEVM.
- Connect a PSU to the TAS5828MEVM and turn on the power.
- Plug in a USB cable from the PC to the TAS5828MEVM. The USB READY LED (Blue) is also illuminated.
- If an optical source is used, the blue SPDIF LOCK LED is illuminated.
- Make sure jumpers configuration are correct with
the appropriate mode: Table 3-1 Boost Jumpers Configurations
Jumper Name LM5155 Boost Mode Configurations External Customer Boost Mode Configurations J12, J13 Battery, GND IN - Battery input OUT J17, J20 PVDD, GND OUT IN - External PVDD J14 PVDD_LM5155 IN OUT J18 PVDD_EXT OUT IN J16 BST_Bypass OUT OUT J15 Ext_BST IN OUT Table 3-2 Control Mode Jumpers ConfigurationsJumper Name Software Control Mode Hardware Control Mode J8 ADR/HW 2-3 - SW(Default 0xC0 Address) 1-2 - HW J10 SDA/HW_SEL0 OUT 1-2 or 2-3 as needed J11 SCL/HW_SEL1 OUT 1-2 or 2-3 as needed
Hardware Control Mode
- Connect speakers to TAS5828MEVM.
- Make sure jumpers configuration are correct with the appropriate mode: See Table 3-1 and Table 3-2.
- Configure S2 to SPDIF input source.
- Note in Hardware Control mode note for some configurations the appropriate resistors will need to be modified on the EVM. See Table 2-1 and Table 2-2 for more details.
- Connect a PSU to the TAS5828MEVM and turn on the power.
- If an optical source is used, the blue SPDIF LOCK LED is illuminated.
