sx8723 Semtech Corporation, sx8723 Datasheet - Page 10
sx8723
Manufacturer Part Number
sx8723
Description
Sx8723 Zoomingadc? For Pressure And Temperature Sensing
Manufacturer
Semtech Corporation
Datasheet
1.SX8723.pdf
(53 pages)
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ADVANCED COMMUNICATIONS & SENSING
Circuit Description
General Description
The SX8723 is a complete low-power acquisition path with programmable gain, acquisition speed and
resolution.
Block Diagram
VREF
The internally generated V
stable voltage reference for the ZoomingADC.
This reference voltage is directly connected to one of the ZoomingADC reference multiplexer inputs.
The bandgap voltage stability is only guaranteed for V
2.4V, the bandgap voltage could reduce by up to 50mV.
The bandgap has relatively weak output drive so it is recommended that if the bandgap is required as a signal
input then PGA1 must be enabled with Gain = 1.
V1.5 © 2007 Semtech Corp.
D0/REF
D1/REF
AC2
AC3
AC4
AC5
OUT
IN
SX8723
V
REF
REF
+
-
is a trimmed bandgap reference with a nominal value of 1.22V that provides a
AC1
+
+
AC0
-
-
GPIO
Figure 3 - SX8723 Block Diagram
ZoomingADC™ for Pressure and Temperature Sensing
PGA
CHARGE
PUMP
CONTROL LOGIC
10
BATT
ZoomingADC
voltages of 3V and above. As V
4MHz
OSC
ADC
I
2
C
TM
BATT
www.semtech.com
READY
V
V
SDA
VSS
SCL
PUMP
BATT
drops down to
SX8723