Actel Fusion Mixed-Signal FPGAs
Table 2-47 • ADC Characteristics in Direct Input Mode (continued)
All Values at Industrial Operating Conditions (unless noted otherwise)
Typical: VCC33A = 3.3 V, VCC = 1.5 V, and TA = 25°C
Parameter
Dynamic Accuracy (using external reference, 100 kHz Sine Wave Input, 2.38 VP-P, 500 ksps,
ADCCLK = 10 MHz)1, 2
Description
Condition
Minimum
Typical
Maximum
Units
f
SNR
Signal-to-Noise Ratio
8-bit mode
10-bit mode
12-bit mode
8-bit mode
10-bit mode
12-bit mode
8-bit mode
10-bit mode
12-bit mode
48.0
58.0
62.9
47.6
57.4
62.0
49.5
60.0
64.5
49.5
59.8
64.2
–74.4
–78.3
–77.9
7.9
dB
dB
dB
SINAD
THD
Signal-to-Noise and
Distortion
dB
dB
dB
Total Harmonic
Distortion
–63.0
–63.0
–64.4
dBc
dBc
dBc
bits
bits
bits
ENOB
Effective Number of Bits 8-bit mode
10-bit mode
7.6
9.2
9.6
12-bit mode
10.0
10.4
Conversion 2
Conversion Time
8-bit mode
10-bit mode
12-bit mode
8-bit mode
10-bit mode
12-bit mode
1.7
1.8
2.0
µs
µs
µs
Sample Rate2
600
550
500
ksps
ksps
ksps
Notes:
1. Accuracy of the external reference is 2.56 V 4.6 mV.
2. Data is based on characterization.
3. The sample rate is time-shared among active analog inputs.
Preliminary v1.7
2-119
ACTEL [ Actel Corporation ]
