MC9S12G Family Reference Manual Rev.1.27
NXP Semiconductors 255
Chapter 4
Reference Voltage Attenuator (RVAV1)
Revision History
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.
Rev. No.
(Item No.)
Date (Submitted
By)
Sections
Affected
Substantial Change(s)
V00.05 09 Jun 2010 • Added appendix title in note to reference reduced ADC clock
• Orthographical corrections aligned to Freescale Publications Style Guide
V00.06 01 Jul 2010 • Aligned to S12 register guidelines
V01.00 18 Oct 2010 • Initial version
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