sx8725 Semtech Corporation, sx8725 Datasheet - Page 6

• Manufacturer Part Number: sx8725
• Description: Sx8725 Zoomingadc? For Pressure And Temperature Sensing
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
ZoomingADC Specifications
Unless otherwise specified: Temperature T
f
IB_AMP_PGA[1:0] = '01'). For resolution n = 12 bits: OSR = 32 and N
Bandgap chopped at N
V1.5 © 2007 Semtech Corp.
S
Analog Input
Differential Input Voltage Ranges
Reference Voltage Range
Programmable Gain Amplifier (PGA)
Total PGA Gain
PGA1 Gain
PGA2 Gain
PGA3 Gain
Gain Setting Precision (each stage)
Gain Temperature Dependence
PGA2 Offset
PGA3 Offset
Offset Setting Precision (PGA2 or 3)
Offset Temperature Dependence
Input Impedance PGA1
Input Impedance PGA2, PGA3
Output RMS noise
ADC Static Performance
Resolution, n
No Missing Codes
Gain Error
Offset Error
Integral Non-Linearity, INL
Differential Non-Linearity, DNL
Common Mode input range
Power Supply Rejection Ratio
ADC Dynamic Performance
Conversion Time
Throughput Rate (Continuous Mode)
Nbr of Initialization Cycles
= 250 kHz, PGA3 on with Gain = 1, PGA1&PGA2 off, offsets GDOff
V
REF, ADC
V
IN
Parameter
= (V
= (V
INP
REFP
- V
ELCONV
– V
INN
)
REFN
rate.
)
GD
GD
GD
GD
GDoff
GDoff
PSRR
T
1/T
N
Symbol
CONV
INIT
A
TOT
1
2
3
CONV
= +25° C, V
2
3
ZoomingADC™ for Pressure and Temperature Sensing
Gain = 1, OSR = 32 (Note 1)
Gain = 100, OSR = 32
Gain = 1000, OSR = 32
(Note 1)
See Table 5
See Table 6
Step = 1/12 V/V, See Table 8
Step = 0.2 V/V, See Table 7
Step = 1/12 V/V, See Table 9
(Note 2)
Gain = 1 (Note 3)
Gain = 10 (Note 3)
Maximal gain (Note 3)
PGA1 (Note 4)
PGA2 (Note 5)
PGA3 (Note 6)
(Note 7)
(Note 8)
(Note 9)
n = 16 bits (Note 10)
n = 12 Bits (Note 11)
n = 16 Bits (Note 11)
n = 12 Bits (Note 12)
n = 16 Bits (Note 12)
VDD = 5V
VDD = 3V
n = 12 bits (Note 14)
n = 16 bits (Note 14)
n = 12 bits, f
n = 16 bits, f
Comments / Conditions
DD
= +5V, GND = 0V, V
6
S
S
0.3V (Note 13)
0.3V (Note 13)
= 250kHz
= 250kHz
ELCONV
2
= GDOff
= 4. For resolution n = 16 bits: OSR = 512 and N
3
= 0. Power operation: normal (IB_AMP_ADC[1:0] =
REF, ADC
V
-63/12
-2.42
-24.2
-2.42
1500
1027
Min
1/12
SS
150
150
133
-3
-1
-3
= +5V, V
1
1
0
6
0
-0.3
IN
0.485
Typ
1.88
205
340
365
0.15
78
72
0.5
0.5
0.6
1.5
0.5
0.5
= 0V, over-sampling frequency
5
5
1
1
V
www.semtech.com
127/12
BATT
63/12
1000
Max
2.42
24.2
2.42
V
10
10
16
16
3
1
3
2
DD
+0.3
SX8725
ELCONV
cycles/f
cycles/f
ppm/° C
ppm/° C
cycles
Unit
kSps
kSps
LSB
LSB
LSB
LSB
LSB
V/V
V/V
V/V
V/V
V/V
V/V
Bits
Bits
mV
mV
k
k
k
µV
µV
µV
dB
dB
%
%
%
%
V
V
V
= 2.
S
S