SBOT048 December 2023 TMUX9832 , TX7332 , TX7516
In handheld ultrasound systems, acoustic aperture, lateral resolution, and signal-to-noise ratio are related to the channel of the transmitter device. More transmit channels mean higher image quality. The architecture of the handheld ultrasound probe transmitter subsystem, shown in the following image, can extend from 16-channels to 128 or more channels. Two common ways to implement this are: (a) through high-voltage multiplexer switches or (b) using integrated pulser (transmitter) devices.
Handheld Ultrasound Probe Transmitter SubsystemDesign Considerations
Comparing Different Transmitter Subsystem Architectures
| Recommended TI Device | TX7332 × 4 | TMUX9832 × 4 + TX7332 | TX7516 × 2 + TMUX9832 × 4 |
|---|---|---|---|
| Number of channels | 128 | 128 | 128 |
| Pulser type | Three-Level | Three-Level | Five-Level |
| Maximum output | ±100 V 1.2 A to 0.3 A | ±100 V 1.2 A to 0.3 A | ±100 V 2 A to 4 A |
| –3-dB Bandwidth | 20 MHz | 20 MHz | 35 MHz |
| Transmit or receive power consumption | 18.1 mW/ch × 128 = 2316.8 mW | TX7332: 18.1 mW/ch × 32 = 579.2 mWTMUX9832: 9.5 mW × 4 = 38 mWTotal: 617.8 mW | TX7516: 77 mW/ch × 32 = 2464 mWTMUX9832: 9.5 mW × 4 = 38 mWTotal: 2502 mW |
| Area of front-end circuit (only semiconductor devices) | 17 × 11 mm2 × 4 = 748 mm2 | 17 × 11 mm2 + 7.5 × 7.5 mm2 × 4 = 412 mm2 | 10 × 10 mm2 × 2 + 7.5 × 7.5 mm2 × 4 = 425 mm2 |
For additional assistance, ask questions to TI audio engineers on the TI E2E™ Data Converters Support Forum.