SX8724C Datasheet, PDF (6/67 Pages) Semtech Corporation – ZoomingADC for sensing data acquisition

ADVANCED COMMUNICATIONS & SENSING
SX8724C
ZoomingADC for sensing data acquisition
DATASHEET
Table 3. Electrical Characteristics
Parameter
Symbol
Comment/Condition
Min
Typ
Max
Unit
Input logic low
VIL
0.25
VBATT
Leakages currents
Input leakage current
Digital input mode,
ILeakIn _{no pull-up or pull-down}
-100
100
nA
VREF: Internal Bandgap Reference
Absolute output voltage
Variation over Temperature
Total Output Noise
VBG
VBGT
VBGN
VBATT > 3V
VBATT > 3V, over Temperature
VBATT > 3V
1.19
1.22
1.25
V
-1.5
+1.5
%
1
mVrms
1. The device can be operated in either active or sleep states. The Sleep state is complete shutdown, but the active state can have a variety of
different current consumptions depending on the settings. Some examples are given here: The Sleep state is the default state after
power-on-reset. The chip can then be placed into an active state after a valid I2C communication is received.
Table 4. ZoomingADC Specifications
Parameter
ANALOG INPUT CHARACTERISTICS
Differential Input Voltage Range
VIN = VINP-VINN
PROGRAMMABLE GAIN AMPLIFIER
Total PGA Gain
PGA1 Gain
PGA2 Gain
PGA3 Gain
Gain Settings Precision (each stage)
Gain Temperature Dependance
PGA2 Offset
PGA3 Offset
Offset Settings Precision
(PGA2 or PGA3)
Offset Temperature Dependance
Input Impedance on PGA1
(see section 11.1, page 47)
Input Impedance on PGA2,3
Output RMS Noise per over-sample
Symbol
Condition
Gain=1, OSR=32, VREF=5V. Note 1
Gain=100, OSR=32, VREF=5V
Gain=1000, OSR=32, VREF=5V
GDTOT
GD1
GD2
GD3
Note 1
(see Table 11, page 22)
(see Table 12, page 23)
Step = 1/12 V/V
(see Table 13, page 23)
Gain ≥ 1
GDOFF2
GDOFF3
Step = 0.2 V/V
(see Table 12, page 23)
Step = 1/12 V/V
(see Table 13, page 23)
Note 2
Gain = 1. Note 3
Gain = 10. Note 3
Gain = 1. Note 3
PGA1. Note 4
PGA2. Note 4
PGA3. Note 4
Min
-2.42
-24.2
-2.42
1/12
1
1
1/12
-3
-1
-63/12
-3
1200
250
150
Typ
±0.5
±5
±0.5
±5
1350
300
200
205
340
365
Max
Unit
+2.42
V
+24.2
mV
+2.42
mV
1000
10
10
127/12
+3
+1
V/V
V/V
V/V
V/V
%
ppm / °C
V/V
+63/12
V/V
+3
%
ppm / °C
kΩ
kΩ
kΩ
μV
μV
μV
Revision 1.01
© Semtech
January 2011
Page 6
www.semtech.com/products/