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TIPD127

PWM to 12-bit Analog Signal Conversion Circuit

Design files

TIPD127

Design files

Overview

This TI Precision Verified Design provides the theory, component selection, simulation, PCB design, and measurement details for a PWM to 12-bit resolution analog signal conversion circuit.  Methods for selecting the passive filter’s order, cutoff frequency, and component values are included.  This design example includes a 12 bit filter but the methodology can be applied to target other desired resolutions.  This design also includes a test circuit, which is required to confirm that the output error (ripple) meets the design requirements because it cannot be directly measured using standard test equipment.

Features
  • 3.3 Vpp 50% duty cycle PWM input
  • 12-bit resoluion, 0-3.3V analog output
  • 403 uVpp Maximum ripple
  • Error (ripple) verification circuit included
  • Supply Voltage: ±15 V dc (for post amplifier)
  • Post amplifier gain: 1024 V/V, ac coupled
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

download Schematic — TIPD127
TIDC027.ZIP (669 K)

Detailed schematic diagram for design layout and components

download Schematic — TIPD127
TIDR288.PDF (305 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIPD127
TIDR289.PDF (87 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

download Gerber file — TIPD127
TIDC017.ZIP (325 K)

Design file that contains information on physical board layer of design PCB

Products

Includes TI products in the design and potential alternatives.

Precision op amps (Vos<1mV)

OPA2209 — Dual, 2.2-nV/rtHz, 18-MHz, precision, RRO, 36-V operational amplifier

Data sheet: PDF | HTML

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Software

Technical documentation

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Type Title Date
* User guide Microcontroller PWM to 12-Bit Analog Out Design Guide Nov. 11, 2013

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