SX8722 데이터 시트보기 (PDF) - Semtech Corporation
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SX8722 Datasheet PDF : 108 Pages
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SX8722
High gain acquisition for sensor interface
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
(1) With external 32.768kHz Xtal connected
(2) Without external 32.768kHz Xtal connected
1.3. ZoomingADC Specifications
Unless otherwise specified: Temperature TA = +25°C, VBATT = +5V, GND = 0V, VREF = +5V, VIN = 0V, RC frequency fRC =
2MHz, sampling frequency fS = 300 kHz, Overall PGA gain GDTOT = 1, offsets GDOff2 = GDOff3 = 0. Power operation: normal
(IB_AMP_ADC[1:0] = IB_AMP_PGA[1:0] = '11'). For resolution n = 12 bits: OSR = 32 and NELCONV = 4. For resolution n = 16
bits: OSR = 512 and NELCONV = 2.
PARAMETER
COMMENTS/CONDITIONS
ANALOG INPUT CHARACTERISTICS
Differential Input Voltage Range
VIN = VINP -VINN
Reference Voltage Range
VREF,ADC = VREFP -VREFN
PROGRAMMABLE GAIN AMPLIFIER
Total PGA Gain
GDTOT
PGA1 Gain
GD1
PGA2 Gain
GD2
PGA3 Gain
GD3
Gain Settings Precision (each stage)
Gain Temperature Dependance Offset
PGA2 Offset
GDoff2
PGA3 Offset
GDoff3
Offset Settings Precision
(PGA2 or PGA3)
Offset Temperature Dependance
Input Impedance PGA1
Input Impedance PGA2 ,PGA3
Output RMS Noise
Gain = 1, OSR = 32 (Note 1)
Gain = 100, OSR = 32
Gain = 1000, OSR = 32
See Table 15
See Table 16
Step = 1/12 V/V, See Table 47
Step = 0.2 V/V, See Table 46
Step = 1.12 V/V, See Table 48
(note 2)
PGA1 Gain = 1 (Note 3)
PGA1 Gain = 10 (Note 3)
Maximal gain = 1 (Note 3)
PGA1 (Note 4)
PGA2 (Note 5)
PGA3 (Note 6)
VALUE
UNITS
MIN
TYP
MAX
-2.42
-24.2
-2.42
+2.42
V
+24.2
mV
+2.42
mV
VBATT
V
0.5
1
1
-3
-1
-63/12
-3
+/- 0.5
+/- 5
+/- 0.5
1000
10
10
127/12
+3
+1
+63/12
+3
V/V
V/V
V/V
V/V
%
ppm / °C
V/V
V/V
%
+/-5
1500
150
150
205
340
365
ppm / °C
kΩ
kΩ
kΩ
μV
μV
μV
ACS - Revision 4.2
©2008 Semtech Corp.
October 2008
Page 7
www.semtech.com
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