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Appendix A: Specifications
CFG280 User Manual
19
Table 3: Counter Specifications
Characteristic
Measurement
I
npu
t
Sele
c
tio
n
I
n
te
rn
al
a
nd
e
x
te
rn
al
i
npu
t
sele
c
ta
b
le
F
r
e
qu
e
ncy
Ra
n
ge
DC
to
1
00
MH
z f
o
r
i
n
te
rn
al
1 Hz to 100 MHz, AC coupled for external
Resol
u
tio
n
F
r
e
qu
e
ncy
mo
d
e:
1
H
z, 1
0
H
z, 1 k
H
z
Period mode: 1 ms
A
ccur
a
cy
F
r
e
qu
e
ncy
mo
d
e:
±(1 c
o
un
t
+
time
b
ase
e
rr
o
r)
Period mode: ±(1 count + time base error
+ trigger error)
External Input
Sensitivity
30 mV
RMS
50 mV
RMS
1 Hz to 50 MHz
50 MHz to 100 MHz
Impedance
1 MW paralleled by 40 pF
Attenuation 3 V to 42 V (X10)
50 mV to 5 V (X1)
Maximum Input Voltage 42 V peak
Internal Time Base
Crystal Frequency 10 MHz
Temperature Stability
<0.001% (10 ppm from 0_ĂC to 40_ĂC)
Line Voltage Stability <±1 ppm with 10% line voltage variation
Aging Rate <±10 ppm/yr