Rainbow Electronics 78M6631 - Manual (Page 20)

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