SLAAEM4 October 2025 TAS2120 , TAS2320
7 Efficiency Results Using the Advanced Device Features
This experiment used the TAS2120EVM evaluation board to characterize the input power consumption of the device under varying conditions. VBAT was set to 4.4V and IOVDD and VDD were set to 1.8V. Two distinct audio tracks were employed: a commercially available song ("Music Track") and a recorded speech sample ("Voice/Speech Track"). The TAS2120EVM was configured to output audio at three volume levels: 100%, 70%, and 30% of maximum output power.
A thorough evaluation of power consumption was performed for different volume settings, with all integrated power-saving features enabled, including internal Class-H, music efficiency mode, noise gate, and Y-bridge. Additionally, a baseline measurement was obtained with all features disabled, allowing for a direct comparison of the power-saving benefits. To further quantify the advantages of the advanced Class-H technology of TAS2x20 devices, a comparative power consumption analysis was conducted using a conventional 500mV Class-H design, representative of existing market offerings.
| Test Setup | Test Cases | Features | Volume |
|---|---|---|---|
| VBAT = 4.4V, IOVDD = VDD = 1.8V, Amplifier level = 18dBV, RL = 4Ω + 33μH, I2C mode, no output filter |
Test Case: 1 | No efficiency features | 30%, 70%, 100% |
| Test Case: 2 | Existing 500mV Class-H design | 30%, 70%, 100% | |
| Test Case: 3 | TAS2120 with advanced efficiency features | 30%, 70%, 100% |
Figure 7-1 Power Consumption Comparison
with Music TrackPower consumption measurements, conducted while playing the Music Track, demonstrated a significant improvement with the advanced efficiency settings. Enabling all available power-saving features reduced the overall power consumption by 64% for 30% volume, 24% for 70% volume, and 11% for 100% volume, relative to a configuration with all features disabled. Furthermore, comparing against the existing 500mV Class-H design, the TAS2120 device can achieve reduced power consumption by 45% for 30% volume, 10% for 70% volume, and 9% for 100% volume.
Figure 7-2 Power Consumption Comparison
with Voice/Speech TrackEnabling all power-saving features, when playing the Voice/Speech Track, resulted in a significantly greater power consumption reduction when compared to disabling all features. Enabling all efficiency features reduced the overall power consumption by 79% for 30% volume, 62% for 70% volume, and 44% for 100% volume, relative to a configuration with all efficiency features disabled. Furthermore, comparing against the existing 500mV Class-H design, the TAS2120 device can achieve reduced power consumption by 67% for 30% volume, 42% for 70% volume, and 21% for 100% volume.