Product in Development

• 14-Bit DAC
• 8-Bit Auxiliary DAC
• Programmable 13-16 Bit Sigma-Delta ADC
• Digital Communication with Host
• 4.3 V Internal Voltage Reference
• Internal Temperature Reference
• 2 Unassigned Opamps
• PWM and Push-Pull Switch at Output

FOR USE IN DISTRIBUTED HIGH VOLTAGE SYSTEMS OR LOW COST SINGLE CHANNEL HIGH VOLTAGE

This custom CMOS integrated circuit integrates all digital communications, D to A and A to D converters, the analog feedback loop and output drivers required to implement a single high voltage converter channel.

Designed for use in distributed high voltage systems or for low cost single channel high voltage. The output voltage range is determined by the external components.

External components required include the power switching transistors (FETs), transformer (if required), voltage multiplier circuits and high voltage feedback divider. External passive components (capacitors) are required for the DAC filters.

This new device is in the prototype evaluation stage.

Performance specifications are to be determined.

FEATURES

This new LeCroy integrated circuit implements a programmable power supply designed to run both a PWM and push-pull topology. There is also an on-board ADC, auxiliary 8-bit DAC, and 2 internal op amps for the designer's use.

Other features include a set of 4 high-speed comparators for implementing overload protection circuitry for the power supply. There is a 4.3 V reference that is stable to 50 ppm/°C for -35° to 50°C. There is also an on-board temperature sensor which can be read by the ADC.

• 5 V CMOS 68-Pin PLCC, Power Consumption 30 mW (typical)
• DAC for Voltage Setting (14 Bit)
• DACs for Voltage and Current Limits (6 Bit)
• Comparators for Limit Conditions
• Programmable 13-16 Bit ADC for Readback of Voltage, Current, Temperature
• Built-in Band Gap Voltage Reference
• Feedback Error Amp for Voltage Control Loop
• 1.6 MHz Clock Based on Local Crystal or Ceramic Resonator
• Switching Frequency Programmable from 50 kHz to 400 kHz
• Switch Waveforms for External Components:

- Pulse width modulated

- Push-pull square wave drive with a linear output to drive a series regulator. Push-pull duty cycle selectable as either 25% or 50% (non-overlapping)

• Reset and Power Turn On Behavior Controlled for Glitch Free High Voltage Output
• Two uncommitted op-amps and auxiliary DAC (8 bit) output and ADC channel input for external circuitry (i.e. discriminator)
• Digital communication with Host using bidirectional serial data bus and a simple command structure. Each chip will have a unique address (8 bits) hardwired using pins. There are NO analog control lines.

set/read configuration/status register

enable/disable high voltage

set/read high voltage DAC

read actual high voltage

read actual output current

read chip temperature

set/read external DAC

read external analog input

enable/set/read over current limit register

enable/set/read over voltage limit register

MHV100 Pin Assignments

Copyright© May 1997. LeCroy is a registered trademark of LeCroy Corporation. All rights reserved. Information in this publication supersedes all earlier versions. Specifications and prices subject to change without notice.