IO20PDB0V0 datasheet(92/197 Pages) MICROSEMI

92 / 197 page

SmartFusion DC and Switching Characteristics

2- 80

R e v i sio n 1 2

Analog-to-Digital Converter (ADC)

Unless otherwise noted, ADC direct input performance is specified at 25°C with nominal power supply

voltages, with the output measured using the external voltage reference with the internal ADC in 12-bit

mode and 500 KHz sampling frequency, after trimming and digital compensation.

Table 2-95 • ADC Specifications

Specification

Test Conditions

Min.

Typ.

Max.

Units

Input voltage range (for driving ADC

over its full range)

2.56

Gain error

±0.4

±0.7

–40ºC to +100ºC

±0.4

±0.7

Input referred offset voltage

±1

±2

–40ºC to +100ºC

±1

±2

Integral non-linearity (INL)

RMS deviation from BFSL

12-bit mode

1.71

LSB

10-bit mode

0.60

1.00

LSB

8-bit mode

0.2

0.33

LSB

Differential non-linearity (DNL)

12-bit mode

2.4

LSB

10-bit mode

0.80

0.94

LSB

8-bit mode

0.2

0.23

LSB

Signal to noise ratio

Effective number of bits (ENOB)

EQ 10

–1 dBFS input

12-bit mode 10 KHz

9.9

Bits

12-bit mode 100 KHz

9.9

Bits

10-bit mode 10 KHz

9.5

9.6

Bits

10-bit mode 100 KHz

9.5

9.6

Bits

8-bit mode 10 KHz

7.8

7.9

Bits

8-bit mode 100 KHz

7.8

7.9

Bits

Full power bandwidth

At –3 dB; –1 dBFS input

300

KHz

Analog settling time

To 0.1% of final value (with 1 Kohm source

impedance and with ADC load)

2µs

Input capacitance

Switched

capacitance

(ADC

sample

capacitor)

Cs: Static capacitance (Figure 2-44 on page 2-85)

CM[n] input

TM[n] input

ADC[n] input

Input resistance

Rin: Series resistance (Figure 2-44)2

Rsh:

Shunt

resistance,

exclusive

switched capacitance effects (Figure 2-44)

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.

ENOB

SINAD 1.76 dB

–

6.02 dB/bit

---------------------------------------------

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