MAX14988

PRODUCTION

2.5A Octal Three-Level Digital Pulsers with TR Switches

Data Sheet (Rev. 0) Product Selection Table

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Overview

Saves Space in High-Channel-Count and Portable Systems
- High Density
  - 8 Channels (Three-Level Operation)
- Integrated Low-Power T/R Switches
- DirectDrive^® Architecture Eliminates External High-Voltage Capacitor
- No External Floating Power Supply (FPS) Required
High Performance Enhances Image Quality)
- Excellent -43dBc (typ) THD for Second Harmonic at 5MHz
- Sync Function Eliminates Effects of FPGA Jitter and Improves Performance in Doppler Mode
- Low Propagation Delay 10.8ns (typ)
- Strong Active Return to Zero
Conserves Power
- Low Quiescent Power Dissipation (13mW/Channel)
- Programmable Current Capability
- Shutdown Mode

The MAX14988 octal three-level, high-volage (HV) pulser device generates high-frequency HV bipolar pulses (up to ±105V) from low-voltage control logic inputs for driving piezoelectric transducers in ultrasound systems. All eight channels have embedded overvoltage-protection diodes and an integrated active return-to-zero clamp. The device has embedded independent (floating) power supplies (FPS) and level shifters that allow signal transmission without the need for external HV capacitors. The device also features eight integrated transmit/receive (T/R) switches.

The device features two modes of operation: shutdown mode and octal three-level pulser mode (with integrated active return-to-zero clamp). In octal three-level pulser mode, each channel is controlled by two logic inputs (DINN_/DINP_) and the active return to zero features half the current driving of the pulser 1.25A (typ).

The device can operate both in clocked and transparent mode. In clocked mode, data inputs can be synchronized with a clean differential or single-ended clock to reduce phase noise associated with FPGA output signals that are detrimental for Doppler analysis. In transparent mode, the synchronization feature is disabled and output reflects the data input after a 10.8ns delay. The device features adjustable maximum current (0.44A to 2.5A) to reduce power consumption when full current capability is not required.

The device features integrated grass-clipping diodes (with low parasitic capacitance) for receive (Rx) and transmit (Tx) isolations. The device features a damping circuit that can be activated as soon as the transmit burst is over. The damping circuit has an on-resistance of 200Ω. It fully discharges the pulser’s output internal node before the grass-clipping diodes.

The device is available in a 68-pin (10mm x 10mm) TQFN package with an exposed pad and are specified over the -40ºC to +85ºC extended temperature range.

APPLICATIONS