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Dual Delta-Sigma Modulator and Encoder

DS8102 and MAXQ3108 Chipset Reduces Board Space and Cost for Three-Phase Meter Designs

Product Details

The DS8102 is a stand-alone, dual-channel, delta-sigma modulator that converts measurements from two differential analog input pairs into a Manchester-encoded output bit stream that can be processed by a companion microcontroller such as the MAXQ3108. One channel operates at a fixed 1x gain, while the other operates at a pin-selectable gain of 1x, 4x, 16x, or 32x. The DS8102 includes an internal power-supply monitor, on-board voltage reference, and low-power oscillator to reduce the number of external components required for data acquisition.

The Manchester-encoded output from the DS8102 combines pulse-density-modulated measurement values from both differential input channels with a synchronization bit stream and is transmitted over a single pin. This transmission scheme is ideal for split voltage domain applications where the DS8102 and other "hot"-side components must be electrically isolated from "cold" low-voltage components such as a companion microcontroller. In this type of application, the DS8102 can be capacitively coupled to a companion microcontroller with only two connection points required (MNOUT and DGND).

The MAXQ3108 dual-core microcontroller, which includes specialized Manchester bit-stream decoding inputs and sinc3 filters, is specifically designed to act as a companion microcontroller for up to three DS8102 devices. This configuration, which supports up to six differential analog input channels, is well suited for three-phase electricity-metering applications.

Key Features

  • Dual Delta-Sigma 2nd-Order Modulators
    • Channel 0: Pin-Selectable Gain of 1x, 4x, 16x, or 32x
    • Channel 1: Fixed Gain of 1x
  • Selectable Internal or External Voltage Reference
  • Manchester-Encoded Bit Stream Output
    • Includes Synchronization Bits to Allow Clock Recovery
    • Single-Pin Transmission Scheme Simplifies Electrical Isolation Using Capacitive Coupling
  • Selectable Internal or External Clock Source
  • Integrated Low-Power 8MHz Oscillator
  • Operating Mode
    • Active Mode (8MHz, VDD = 3.6V): 3.5mA

Applications/Uses

Simplified Block Diagram

DS8102: Typical Operating Circuit DS8102: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet Dual Delta-Sigma Modulator and Encoder Mar 03, 2009

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Parameters

Key Features

  • Dual Delta-Sigma 2nd-Order Modulators
    • Channel 0: Pin-Selectable Gain of 1x, 4x, 16x, or 32x
    • Channel 1: Fixed Gain of 1x
  • Selectable Internal or External Voltage Reference
  • Manchester-Encoded Bit Stream Output
    • Includes Synchronization Bits to Allow Clock Recovery
    • Single-Pin Transmission Scheme Simplifies Electrical Isolation Using Capacitive Coupling
  • Selectable Internal or External Clock Source
  • Integrated Low-Power 8MHz Oscillator
  • Operating Mode
    • Active Mode (8MHz, VDD = 3.6V): 3.5mA

Applications/Uses

Description

The DS8102 is a stand-alone, dual-channel, delta-sigma modulator that converts measurements from two differential analog input pairs into a Manchester-encoded output bit stream that can be processed by a companion microcontroller such as the MAXQ3108. One channel operates at a fixed 1x gain, while the other operates at a pin-selectable gain of 1x, 4x, 16x, or 32x. The DS8102 includes an internal power-supply monitor, on-board voltage reference, and low-power oscillator to reduce the number of external components required for data acquisition.

The Manchester-encoded output from the DS8102 combines pulse-density-modulated measurement values from both differential input channels with a synchronization bit stream and is transmitted over a single pin. This transmission scheme is ideal for split voltage domain applications where the DS8102 and other "hot"-side components must be electrically isolated from "cold" low-voltage components such as a companion microcontroller. In this type of application, the DS8102 can be capacitively coupled to a companion microcontroller with only two connection points required (MNOUT and DGND).

The MAXQ3108 dual-core microcontroller, which includes specialized Manchester bit-stream decoding inputs and sinc3 filters, is specifically designed to act as a companion microcontroller for up to three DS8102 devices. This configuration, which supports up to six differential analog input channels, is well suited for three-phase electricity-metering applications.

Simplified Block Diagram

DS8102: Typical Operating Circuit DS8102: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet Dual Delta-Sigma Modulator and Encoder Mar 03, 2009

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal