A2F060 datasheet(94/192 Pages) MICROSEMI

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SmartFusion DC and Switching Characteristics

2-82

Revision 10

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.

Table 2-97 • 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

Input referred offset voltage

GDEC[1:0] = 11

–0.31

–0.07

0.31

% FS*

–40ºC to +100ºC

–1.00

1.47

% FS*

GDEC[1:0] = 10

–0.34

–0.07

0.34

% FS*

–40ºC to +100ºC

–0.90

1.37

% FS*

GDEC[1:0] = 01

–0.61

–0.07

0.35

% FS*

–40ºC to +100ºC

–1.05

1.35

% FS*

GDEC[1:0] = 00

–0.39

–0.07

0.35

% FS*

–40ºC to +100ºC

–1.06

1.38

% FS*

SINAD

Non-linearity

RMS deviation from BFSL

0.5

% FS*

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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