Datasheet

5
21454312fa
LTC2145-12/
LTC2144-12/LTC2143-12
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
LTC2145-12 LTC2144-12 LTC2143-12
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
SNR Signal-to-Noise Ratio 5MHz Input
70MHz Input
140MHz Input
l
69.4
70.6
70.5
70.3
69.2
70.5
70.4
70.2
69.6
70.8
70.7
70.5
dBFS
dBFS
dBFS
SFDR Spurious Free Dynamic Range
2nd Harmonic
5MHz Input
70MHz Input
140MHz Input
l
76
89
88
84
77
89
88
84
78
89
88
84
dBFS
dBFS
dBFS
Spurious Free Dynamic Range
3rd Harmonic
5MHz Input
70MHz Input
140MHz Input
l
79
89
88
84
79
89
88
84
80
89
88
84
dBFS
dBFS
dBFS
Spurious Free Dynamic Range
4th Harmonic or Higher
5MHz Input
70MHz Input
140MHz Input
l
84
95
95
95
84
95
95
95
84
95
95
95
dBFS
dBFS
dBFS
S/(N+D) Signal-to-Noise Plus
Distortion Ratio
5MHz Input
70MHz Input
140MHz Input
l
69
70.5
70.4
70
68.9
70.4
70.3
69.9
69.4
70.7
70.6
70.2
dBFS
dBFS
dBFS
Crosstalk 10MHz Input –110 –110 –110 dBc