参数资料
型号: SX8725CWLTDT
元件分类: ADC
英文描述: 2-CH 16-BIT PROPRIETARY METHOD ADC, SERIAL/PARALLEL ACCESS, PDSO12
封装: 4 X 4 MM, HALOGEN FREE AND ROHS COMPLIANT, MLPD-12
文件页数: 6/68页
文件大小: 1718K
代理商: SX8725CWLTDT
www.semtech.com/products/
Page 14
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8725C
ZoomingADC for sensing data acquisition
Revision 1.01
January 2011
Semtech
6 General Description
The SX8725C is a complete low-power acquisition path with programmable gain, acquisition speed and resolution.
6.1 Bloc diagram
6.2 VREF
The internally generated VREF is a trimmed bandgap reference with a nominal value of 1.22V that provides a 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 VBATT voltages of 3V and above. As VBATT drops down to 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.
Figure 3. SX8725C bloc diagram
AC0
SI
G
N
AL
MU
X
+
-
+
-
REF
M
U
X
READY
AC3
AC2
AC1
PGA
ADC
VREF
+
-
ZoomingADC
TM
VPUMP
VBATT
SCL
SDA
D1
D0
SX8725C
VSS
CONTROL LOGIC
GPIO
CHARGE
PUMP
4MHz
OSC
I
2C
D0: digital IO, Vref output or I2C address select
D1: digital IO, Vref input or I2C address select
(1)
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