DS_6618_005
78M6618 Data Sheet
2.4.15 ADC Converter, V3P3A Referenced
Table 19 shows the performance specifications for the ADC converter, V3P3A referenced. For this data,
FIR_LEN=0, VREF_DIS=0 and LSB values do not include the 9-bit left shift at the CE input.
Table 19: ADC Converter Performance Specifications
Parameter
Condition
Recommended Input Range
(Vin-V3P3A)
Voltage to Current Crosstalk
106 *Vcrosstalk cos(∠Vin − ∠Vcrosstalk)
Vin
THD (First 10 harmonics) 1:
250 mV-pk
20 mV-pk
Vin = 200 mV peak,
65 Hz, on VA.
Vcrosstalk = largest
measurement on IA or IB
Vin=65 Hz,
64 kpts FFT, Blackman-
Harris window
CKCE = 5 MHz
Input Impedance
Vin = 65 Hz
Temperature coefficient of Input
Impedance
Vin = 65 Hz
LSB size
[M40MHZ,
VLSB
= VREF
⋅
1.25
4.75
⋅
3
3
L
M26MHZ] =
[00], [10], or [11]
L = FIR length
[M40MHZ,
M26MHZ] =
[01]
FIR_LEN=0
FIR_LEN=1
FIR_LEN=0
Digital Full Scale
L 3
3
L = FIR length
[M40MHZ,
M26MHZ] =
[00], [10], or [11]
[M40MHZ,
M26MHZ] =
[01]
ADC Gain Error versus
%Power Supply Variation
106 ∆NoutPK 357nV /VIN
100 ∆V 3P3A / 3.3
FIR_LEN=0
FIR_LEN=1
FIR_LEN=0
Vin=200 mV pk, 65 Hz
V3P3A=3.0 V, 3.6 V
Input Offset (Vin-V3P3A)
1 Guaranteed by design; not production tested.
Min
-250
-101
40
-10
Typ
1.7
3231
355
1319
±97336
±884736
±238328
Max
250
101
-75
-90
90
50
10
Unit
mV
peak
µV/V
dB
dB
kΩ
Ω/°C
nV/
LSB
nV/
LSB
LSB
LSB
ppm/%
mV
Rev. 1.4
21