SX8722I070LF SEMTECH [Semtech Corporation], SX8722I070LF Datasheet - Page 51

• Manufacturer Part Number: SX8722I070LF
• Description: High gain acquisition for sensor interface
• Manufacturer: SEMTECH [Semtech Corporation]

12. ZoomingADC
12.1. ZoomingADC Features
The ZoomingADC is a complete and versatile low-power analog front-end interface typically intended for sensing
applications.
The key features of the ZoomingADC are:
12.1.1. Overview
The total acquisition chain consists of an input multiplexer, 3 programmable gain amplifier stages and an oversampled A/D
converter. The reference voltage can be selected on two different channels. Two offset compensation amplifiers allow for a
wide offset compensation range. The programmable gain and offset allow to zoom in on a small portion of the reference
voltage defined input range.
12.2. Acquisition Chain
The figure above shows the general block diagram of the acquisition chain (AC).
Analog inputs can be selected among eight input channels, while reference input is selected between two differential
channels.
ACS - Revision 4.2
©2008 Semtech Corp.
ADVANCED COMMUNICATIONS & SENSING
Programmable 6 to 16-bit dynamic range oversampled ADC
Flexible gain programming between 0.5 and 1000
Flexible and large range offset compensation
4-channel differential or 8-channel single-ended input multiplexer
2-channel differential reference inputs
Power saving modes
AC
AR
0
0
1
2
3
4
5
6
7
1
2
3
V
IN
Figure 31. ZoomingADC general functional block diagram
f
S
October 2008
V
REF
+
-
PGA1
+
-
OFF2
+
-
PGA2
Page 51
+
-
High gain acquisition for sensor interface
+
+
-
-
PGA3
OFF3
+
-
V
+
-
IN, ADC
DATASHEET
ADC
www.semtech.com
SX8722
f
S
16 bits