K20P144M120SF3_1210 Datasheet, PDF (53/86 Pages) Freescale Semiconductor, Inc – K20 Sub-Family

Peripheral operating requirements and behaviors
Table 31. 16-bit ADC with PGA characteristics (continued)
Symbol
THD
Description
Total harmonic
distortion
Conditions
• Gain=1
• Gain=64
SFDR Spurious free
dynamic range
• Gain=1
• Gain=64
ENOB Effective number
of bits
• Gain=1, Average=4
• Gain=1, Average=8
• Gain=64, Average=4
• Gain=64, Average=8
• Gain=1, Average=32
• Gain=2, Average=32
• Gain=4, Average=32
• Gain=8, Average=32
• Gain=16, Average=32
• Gain=32, Average=32
• Gain=64, Average=32
Min.
85
49
85
53
11.6
8.0
7.2
6.3
12.8
11.0
7.9
7.3
6.8
6.8
7.5
Typ.¹
100
95
Max.
—
—
105
—
88
—
13.4
—
13.6
—
9.6
—
9.6
—
14.5
—
14.3
—
13.8
—
13.1
—
12.5
—
11.5
—
10.6
—
Unit
Notes
dB
16-bit
dB
differential
mode,
Average=32,
f_in=100Hz
dB
16-bit
dB
differential
mode,
Average=32,
f_in=100Hz
bits
16-bit
bits
differential
mode,f_in=100Hz
bits
bits
bits
bits
bits
bits
bits
bits
bits
SINAD
Signal-to-noise
plus distortion
ratio
See ENOB
6.02 × ENOB + 1.76
dB
1. Typical values assume V_DDA =3.0V, Temp=25°C, f_ADCK=6MHz unless otherwise stated.
2. This current is a PGA module adder, in addition to ADC conversion currents.
3. Between IN+ and IN-. The PGA draws a DC current from the input terminals. The magnitude of the DC current is a strong
function of input common mode voltage (V_CM) and the PGA gain.
4. Gain = 2^PGAG
5. After changing the PGA gain setting, a minimum of 2 ADC+PGA conversions should be ignored.
6. Limit the input signal swing so that the PGA does not saturate during operation. Input signal swing is dependent on the
PGA reference voltage and gain setting.
6.6.2 CMP and 6-bit DAC electrical specifications
Table 32. Comparator and 6-bit DAC electrical specifications
Symbol
V_DD
I_DDHS
I_DDLS
V_AIN
V_AIO
Description
Supply voltage
Supply current, High-speed mode (EN=1, PMODE=1)
Supply current, low-speed mode (EN=1, PMODE=0)
Analog input voltage
Analog input offset voltage
Min.
1.71
—
—
V_SS – 0.3
—
Table continues on the next page...
Typ.
—
—
—
—
—
Max.
3.6
200
20
V_DD
20
Freescale Semiconductor, Inc.
K20 Sub-Family Data Sheet, Rev. 4, 10/2012.
Unit
V
μA
μA
V
mV
53