78M6631 Data Sheet
DS_6631_056
2.4.9 ADC Converter, V3P3A Referenced
Table 13 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 13: ADC Converter Performance Specifications
10 * Vcrosstalk
Vin
V LSB ? V REF ? ? ? ?
Parameter
Recommended Input Range
(V IN - V3P3A)
Voltage to Current Crosstalk
6
cos( ? Vin ? ? Vcrosstalk )
THD (First 10 harmonics) 1 :
250 mV-pk
20 mV-pk
Input Impedance
Temperature coefficient of Input
Impedance
[ M40MHZ ,
LSB size
M26MHZ ] =
3
1 .25 ? 3 ?
[00], [10], or [11]
4 . 75 ? L ?
[ M40MHZ ,
L = FIR length
M26MHZ ] =
[01]
Condition
V IN = 200 mV peak,
65 Hz, on VA.
Vcrosstalk = largest
measurement on IA or IB
V IN = 65 Hz,
64 kpts FFT, Blackman-
Harris window
CKCE = 5 MHz
V IN = 65 Hz
V IN = 65 Hz
Min
-250
-10 1
40
Typ
1.7
Max
+250
+10 1
-75 1
-90 1
90
Unit
mV
peak
? V/V
dB
dB
k ?
? /°C
nV/
LSB
nV/
LSB
M26MHZ ] =
? L ?
[00], [10], or [11]
? 3 ?
[ M40MHZ ,
Digital Full Scale [ M40MHZ ,
3
? ?
L = FIR length
M26MHZ ] =
[01]
LSB
LSB
A DC Gain Error versus
%Power Supply Variation
10 6 ? Nout PK 357 nV / V IN
100 ? V 3 P 3 A / 3 . 3
Input Offset (V IN - V3P3A)
V IN = 200 mV pk, 65
Hz, V3P3A=3.0 V, 3.6
V
-10
50
+10
ppm/%
mV
1
Guaranteed by design; not production tested.
20
Rev 2
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