Datasheet

5
21454314fa
LTC2145-14/
LTC2144-14/LTC2143-14
INTERNAL REFERENCE CHARACTERISTICS
The l denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CM
Output Voltage I
OUT
= 0 0.5 • V
DD
– 25mV 0.5 • V
DD
0.5 • V
DD
+ 25mV V
V
CM
Output Temperature Drift ±25 ppm/°C
V
CM
Output Resistance –600µA < I
OUT
< 1mA 4 
V
REF
Output Voltage I
OUT
= 0 1.225 1.250 1.275 V
V
REF
Output Temperature Drift ±25 ppm/°C
V
REF
Output Resistance –400µA < I
OUT
< 1mA 7 
V
REF
Line Regulation 1.7V < V
DD
< 1.9V 0.6 mV/V
DYNAMIC ACCURACY
The l denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. A
IN
= –1dBFS. (Note 5)
SYMBOL PARAMETER CONDITIONS
LTC2145-14 LTC2144-14 LTC2143-14
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
SNR Signal-to-Noise Ratio 5MHz Input
70MHz Input
140MHz Input
l
71.4
73.1
73
72.6
71.2
72.9
72.8
72.4
71.7
73.4
73.3
72.9
dBFS
dBFS
dBFS
SFDR Spurious Free Dynamic Range
2nd Harmonic
5MHz Input
70MHz Input
140MHz Input
l
76
90
89
84
77
90
89
84
78
90
89
84
dBFS
dBFS
dBFS
Spurious Free Dynamic Range
3rd Harmonic
5MHz Input
70MHz Input
140MHz Input
l
79
90
89
84
79
90
89
84
81
90
89
84
dBFS
dBFS
dBFS
Spurious Free Dynamic Range
4th Harmonic or Higher
5MHz Input
70MHz Input
140MHz Input
l
86
95
95
95
86
95
95
95
86
95
95
95
dBFS
dBFS
dBFS
S/(N+D) Signal-to-Noise Plus
Distortion Ratio
5MHz Input
70MHz Input
140MHz Input
l
70.8
73
72.8
72.2
70.8
72.8
72.6
72
71.4
73.2
73.1
72.4
dBFS
dBFS
dBFS
Crosstalk 10MHz Input –110 –110 –110 dBc