Datasheet

56F807 Technical Data Technical Data, Rev. 16
44 Freescale Semiconductor
3.11 Analog-to-Digital Converter (ADC) Characteristics
Table 3-16 ADC Characteristics
Operating Conditions: V
SS
= V
SSA
= 0 V, V
DD
= V
DDA
= 3.0–3.6 V, V
REF
= V
DD
-0.3V, ADCDIV = 4, 9, or 14, (for optimal performance),
ADC clock = 4MHz, 3.0–3.6 V, T
A
= –40° to +85°C, C
L
≤ 50pF, f
OP
= 80MHz
Characteristic Symbol Min Typ Max Unit
ADC input voltages V
ADCIN
0
1
1. For optimum ADC performance, keep the minimum V
ADCIN
value > 25mV. Inputs less than 25mV may convert to a digital
output code of 0.
—
V
REF
2
2. V
REF
must be equal to or less than V
DDA
and must be greater than 2.7V. For optimal ADC performance, set V
REF
to
V
DDA
-0.3V.
V
Resolution R
ES
12 — 12 Bits
Integral Non-Linearity
3
3. Measured in 10-90% range.
INL — +/- 2.5 +/- 4
LSB
4
4. LSB = Least Significant Bit.
Differential Non-Linearity DNL — +/- 0.9 +/- 1
LSB
4
Monotonicity GUARANTEED
ADC internal clock
5
5. Guaranteed by characterization.
f
ADIC
0.5 — 5 MHz
Conversion range R
AD
V
SSA
—V
DDA
V
Conversion time t
ADC
—6—
t
AIC
cycles
6
6. t
AIC
= 1/f
ADIC
Sample time t
ADS
—1—
t
AIC
cycles
6
Input capacitance C
ADI
—5—
pF
6
Gain Error (transfer gain)
5
E
GAIN
0.93 1.00 1.08 —
Total Harmonic Distortion
5
THD 60 64 —
Offset Voltage
5
V
OFFSET
-90 -25 +10 mV
Signal-to-Noise plus Distortion
5
SINAD 55 60 — —
Effective Number of Bits
5
ENOB 9 10 — bit
Spurious Free Dynamic Range
5
SFDR 65 70 — dB
Bandwidth BW — 100 — KHz
ADC Quiescent Current (each dual ADC) I
ADC
—50— mA
V
REF
Quiescent Current (each dual ADC) I
VREF
—1216.5mA