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 TA = 25°C. (Note 5)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VCM Output Voltage
IOUT = 0
0.5 VDD – 25mV
0.5 VDD
0.5 VDD + 25mV
V
VCM Output Temperature Drift
±25
ppm/°C
VCM Output Resistance
–600μA < IOUT < 1mA
4
Ω
VREF Output Voltage
IOUT = 0
1.225
1.250
1.275
V
VREF Output Temperature Drift
±25
ppm/°C
VREF Output Resistance
–400μA < IOUT < 1mA
7
Ω
VREF Line Regulation
1.7V < VDD < 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 TA = 25°C. AIN = –1dBFS. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
LTC2145-14
LTC2144-14
LTC2143-14
UNITS
MIN
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
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
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
Spurious Free Dynamic Range
4th Harmonic or Higher
5MHz Input
70MHz Input
140MHz Input
l
86
95
86
95
86
95
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
Crosstalk
10MHz Input
–110
dBc