MAX840

PRODUCTION

Low-Noise, Regulated, -2V GaAsFET Bias

Operates with Small Capacitors, as Low as 0.22 µF

Data Sheet (Rev. 1) Product Selection Table
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Overview

  • Fixed -2V or Adjustable -0.5V to -9.4V Output at 4mA (MAX840)
  • 2.5V to 10V Input Voltage Range
  • Operate with Small Capacitors (as low as 0.22µF)
  • 1mVp-p Output Voltage Ripple
  • Charge-Pump Switching Frequency:
    • 100kHz in Normal Operation
    • 20kHz in Shutdown Mode (MAX844)
  • 1µA Max Logic-Level Shutdown Over Temp. (MAX840/MAX843)
  • Small 8-Pin SO Package
MAX840
Low-Noise, Regulated, -2V GaAsFET Bias
MAX840, MAX843, MAX844: Typical Operating Circuit
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Documentation

Data Sheet 1

Technical Articles 1

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Evaluation Kits

MAX840EVKIT

Evaluation Kit for the MAX840, MAX843, MAX844

Buy Now View Details

Features and Benefits

  • 1mVp-p Output Voltage Ripple
  • 2.5V to 10V Input Range
  • Uses 0.22µF Capacitors
  • -2V Regulated Output (or Adjustable)
  • 4mA Output Current
  • Surface-Mount Technology

Product Details

The MAX840/MAX843/MAX844 ICs are inverting, charge-pump DC-DC converters with low-noise, regulated outputs. Their low output ripple voltage makes these devices ideal for biasing the GaAsFETs commonly found in cellular telephone transmitters.

The MAX840 evaluation kit (EV kit) is a fully assembled and tested surface-mount board. The board is shipped with a MAX840 mounted, but it can be replaced by the MAX843 or MAX844. Provisions are made for mounting two additional resistors, which are required for output voltages other than -2V. A special scope-probe socket is also mounted on the board, so output noise can be observed on an oscilloscope.

Applications

  • Cell Phones
  • Continuously Adjustable GaAsFET Bias
  • GaAsFET Power Amplifier Modules
  • LCD-Bias Contrast Control
  • Personal Communicators, PDAs
  • Regulated Negative Power Supplies
  • Wireless Data Loggers

MAX843EVKIT

Evaluation Kit for the MAX840, MAX843, MAX844

Buy Now View Details

Features and Benefits

  • 1mVp-p Output Voltage Ripple
  • 2.5V to 10V Input Range
  • Uses 0.22µF Capacitors
  • -2V Regulated Output (or Adjustable)
  • 4mA Output Current
  • Surface-Mount Technology

Product Details

The MAX840/MAX843/MAX844 ICs are inverting, charge-pump DC-DC converters with low-noise, regulated outputs. Their low output ripple voltage makes these devices ideal for biasing the GaAsFETs commonly found in cellular telephone transmitters.

The MAX840 evaluation kit (EV kit) is a fully assembled and tested surface-mount board. The board is shipped with a MAX840 mounted, but it can be replaced by the MAX843 or MAX844. Provisions are made for mounting two additional resistors, which are required for output voltages other than -2V. A special scope-probe socket is also mounted on the board, so output noise can be observed on an oscilloscope.

Applications

  • Cell Phones
  • Continuously Adjustable GaAsFET Bias
  • GaAsFET Power Amplifier Modules
  • LCD-Bias Contrast Control
  • Personal Communicators, PDAs
  • Regulated Negative Power Supplies
  • Wireless Data Loggers

MAX844EVKIT

Evaluation Kit for the MAX840, MAX843, MAX844

Buy Now View Details

Features and Benefits

  • 1mVp-p Output Voltage Ripple
  • 2.5V to 10V Input Range
  • Uses 0.22µF Capacitors
  • -2V Regulated Output (or Adjustable)
  • 4mA Output Current
  • Surface-Mount Technology

Product Details

The MAX840/MAX843/MAX844 ICs are inverting, charge-pump DC-DC converters with low-noise, regulated outputs. Their low output ripple voltage makes these devices ideal for biasing the GaAsFETs commonly found in cellular telephone transmitters.

The MAX840 evaluation kit (EV kit) is a fully assembled and tested surface-mount board. The board is shipped with a MAX840 mounted, but it can be replaced by the MAX843 or MAX844. Provisions are made for mounting two additional resistors, which are required for output voltages other than -2V. A special scope-probe socket is also mounted on the board, so output noise can be observed on an oscilloscope.

Applications

  • Cell Phones
  • Continuously Adjustable GaAsFET Bias
  • GaAsFET Power Amplifier Modules
  • LCD-Bias Contrast Control
  • Personal Communicators, PDAs
  • Regulated Negative Power Supplies
  • Wireless Data Loggers
MAX840EVKIT
Evaluation Kit for the MAX840, MAX843, MAX844
MAX843EVKIT
Evaluation Kit for the MAX840, MAX843, MAX844
MAX844EVKIT
Evaluation Kit for the MAX840, MAX843, MAX844

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