as8510 austriamicrosystems, as8510 Datasheet - Page 12

• Manufacturer Part Number: as8510
• Description: Data Acquisition Device For Battery Sensors
• Manufacturer: austriamicrosystems

AS8510
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6.4.3 Sigma Delta Analog to Digital Converter
Table 17. Sigma Delta Analog to Digital Converter
Notes:
6.4.4 Bandgap Reference Voltage
Table 18. Bandgap Reference Voltage
Notes:
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VREF
V
VREF
PSRR
ESR
SUT
R
V
Symbol
CL
REF
SUT
NDVREF
NDVREF
Symbol
V
VREF
VREF
RES
1. Production test at ±800mV. Maximum V
2. Programmable. It is defined with respect to the first decimator in the ΣΔ ADC.
3. Programmable: Internal clock is 1024/2048 kHz; external clock max is 8192 kHz.
4. Dependent on fovs, R1 and R2. The bandwidth is calculated according to the formula:
5. Defined at maximum input signal, BW=500 Hz (1Hz to 500 Hz), fovs=1024 kHz, R1=64, fchop=2 kHz and R2=2.
6. Reference voltage might be forced from external.
1. Accuracy at 65ºC.
2. No DC current is allowed from this pin.
3. This is a design parameter and not production tested.
INADC
fovs
BW
S/N
AVDD
VREF
R1
DRIFT
TRIM
PD
ACC
REF
BW=fovs/(2*R1*R2); the sampling frequency at the output of the A/D converter is 2*BW.
Oversampling ratio/Decimation Ratio
Bandgap reference thermal noise density
Reference Voltage Initial Accuracy
Reference Voltage Temperature drift
Start Up Time from power down
Start Up Time with supply ramp
Reference Voltage after trim
Oversampling frequency
Output resistance of band gap
Output Capacitor (Ceramic)
Signal to noise ratio
Reference voltage
Number of bits
Input range
Bandwidth
Parameter
Parameter
PSR @ dc
4
1
6
5
IN
3
can be 1.22V with VREF=1.225V.
1, 2
3
3
2
1, 2
3
Revision 3.4
At Vref = 1.22V
Conditions
-20 to 65 ºC
Temperature range
Temperature range
Trim at 65ºC
-40 to 125 ºC
Conditions
At 65ºC
(see note 4)
Min
64
0.02
0
1
Min
1.225
1024/
2048
1.225
Typ
128
+0.4/
Typ
-0.6
90
200
100
80
5
±1.22
Max
128
500
Max
±3.5
±0.4
500
300
16
1
1
nV/√Hz
Units
Units
kHz
bits
12 - 46
Hz
dB
mV
dB
ms
ms
nF
%
%
Ω
Ω
V
V
V