S9S12G64F0CLF Datasheet, PDF (261/1292 Pages) Freescale Semiconductor, Inc – Reference Manual and Data Sheet

Chapter 4
Reference Voltage Attenuator (RVAV1)
Revision History
Rev. No. Date (Submitted
(Item No.)
By)
V00.05
09 Jun 2010
V00.06
01 Jul 2010
Sections
Affected
Substantial Change(s)
• Added appendix title in note to reference reduced ADC clock
• Orthographical corrections aligned to Freescale Publications Style Guide
• Aligned to S12 register guidelines
V01.00
18 Oct 2010
• Initial version
4.1 Introduction
The reference voltage attenuator (RVA) provides a circuit for reduction of the ADC reference voltage
difference VRH-VSSA to gain more ADC resolution.
4.2 Features
The RVA has the following features:
• Attenuation of ADC reference voltage with low long-term drift
4.3 Block Diagram
The block diagram of the RVA module is shown below.
Refer to device overview section “ADC VRH/VRL Signal Connection” for connection of RVA to pins
and ADC module.
MC9S12G Family Reference Manual, Rev.1.23
Freescale Semiconductor
263