IO20PDB0V0 datasheet(93/197 Pages) MICROSEMI

93 / 197 page

SmartFusion Customizable System-on-Chip (cSoC)

Re vi s i on 12

2 - 81

Analog Bipolar Prescaler (ABPS)

With the ABPS set to its high range setting (GDEC = 00), a hypothetical input voltage in the range –15.36

V to +15.36 V is scaled and offset by the ABPS input amplifier to match the ADC full range of 0 V to 2.56

V using a nominal gain of –0.08333 V/V. However, due to reliability considerations, the voltage applied to

the ABPS input should never be outside the range of –11.5 V to +14.4 V, restricting the usable ADC input

voltage to 2.238 V to 0.080 V and the corresponding 12-bit output codes to the range of 3581 to 128

(decimal), respectively.

Unless otherwise noted, ABPS performance is specified at 25°C with nominal power supply voltages,

with the output measured using the internal voltage reference with the internal ADC in 12-bit mode and

100 KHz sampling frequency, after trimming and digital compensation; and applies to all ranges.

Input leakage current

–40°C to +100°C

µA

Power supply rejection ratio

ADC power supply operational current

requirements

VCC33ADCx

2.5

VCC15A

Table 2-95 • ADC Specifications (continued)

Specification

Test Conditions

Min.

Typ.

Max.

Units

Note:

All 3.3 V supplies are tied together and varied from 3.0 V to 3.6 V. 1.5 V supplies are held constant.

Table 2-96 • ABPS Performance Specifications

Specification

Test Conditions

Min.

Typ.

Max.

Units

Input voltage range (for driving ADC

over its full range)

GDEC[1:0] = 11

±2.56

GDEC[1:0] = 10

±5.12

GDEC[1:0] = 01

±10.24

GDEC[1:0]

(limited

maximum rating)

See note 1

Analog gain (from input pad to ADC

input)

GDEC[1:0] = 11

–0.5

V/V

GDEC[1:0] = 10

–0.25

V/V

GDEC[1:0] = 01

–0.125

V/V

GDEC[1:0] = 00

–0.0833

V/V

Gain error

–2.8

–0.4

0.7

–40ºC to +100ºC

–2.8

–0.4

0.7

Note:

*FS is full-scale error, defined as the difference between the actual value that triggers the transition to full-scale

and the ideal analog full-scale transition value. Full-scale error equals offset error plus gain error. Refer to the

Analog-to-Digital Converter chapter of the SmartFusion Programmable Analog User’s Guide for more

information.

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