AS8515 datasheet(39/65 Pages) AMSCO

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AS8515

Datasheet - AS8515 Bottom Die Overvi ew

Sigma Delta Analog to Digital Converter.

Notes:

1. Production test at ±800mV. Maximum VIN can be 1.22V with VREF=1.225V.

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:

BW=fovs/(2*R1*R2); the sampling frequency at the output of the A/D converter is 2*BW.

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.

Bandgap Reference Voltage.

Notes:

1. Accuracy at 65ºC. No DC current is allowed from this pin.

2. Specification does not include solder shift and life time drift.

3. Please refer Figure 26 for typical life time drift based on system level measurements.

4. This is a design parameter and not production tested.

Table 34. Sigma Delta Analog to Digital Converter

Symbol

Parameter

Conditions

Min

Typ

Max

Units

VREF

Reference voltage

1.225

VINADC

Input range

At VREF = 1.22V

0±1.22

Oversampling ratio/Decimation Ratio

128

fOVS

Oversampling frequency

1024/

2048

kHz

RES

Number of bits

bits

Bandwidth

500

S/N

Signal to noise ratio

Table 35. Bandgap Reference Voltage

Symbol

Parameter

Conditions

Min

Typ

Max

Units

VREFTRIM

Reference Voltage after trim

1, 2, 3

Trim at 65ºC

1.225

VREFACC

Reference Voltage Initial Accuracy

1, 2, 3

At 65ºC (0 Hour data)

±3.5

VREFDRIFT

Reference Voltage Temperature drift

Temperature range

-20ºC to 65ºC

±0.4

Temperature range

-40ºC to 125ºC

+0.4/

-0.6

PSRRREF

PSR @ dc

SUTAVDD

Start Up Time with supply ramp

5ms

SUTPD

Start Up Time from power down

1ms

RNDVREF

Output resistance of band gap

500

1000

VNDVREF

Bandgap reference thermal noise density

300

nV/

√Hz

CLVREF

Output Capacitor (Ceramic)

100

ESRVREF

0.02

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