Datasheet

LTC2258-14
LTC2257-14/LTC2256-14
4
225814fc
For more information www.linear.com/LTC2258-14For more information www.linear.com/LTC2258-14
analog inpuT
The l denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Analog Input Range (A
IN
+
– A
IN
–
) 1.7V < V
DD
< 1.9V
l
1 to 2 V
P-P
V
IN(CM)
Analog Input Common Mode (A
IN
+
+ A
IN
–
)/2 Differential Analog Input (Note 8)
l
V
CM
– 100mV V
CM
V
CM
+ 100mV V
V
SENSE
External Voltage Reference Applied to SENSE External Reference Mode
l
0.625 1.250 1.300 V
I
INCM
Analog Input Common Mode Current Per Pin, 65Msps
Per Pin, 40Msps
Per Pin, 25Msps
81
50
31
µA
µA
µA
I
IN1
Analog Input Leakage Current 0 < A
IN
+
, A
IN
–
< V
DD
, No Encode
l
–1 1 µA
I
IN2
PAR/SER Input Leakage Current 0 < PAR/SER < V
DD
l
–3 3 µA
I
IN3
SENSE Input Leakage Current 0.625 < SENSE < 1.3V
l
–6 6 µA
t
AP
Sample-and-Hold Acquisition Delay Time 0 ns
t
JITTER
Sample-and-Hold Acquisition Delay Jitter 0.17 ps
RMS
CMRR Analog Input Common Mode Rejection Ratio 80 dB
BW-3B Full-Power Bandwidth Figure 6 Test Circuit 800 MHz
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
LTC2258-14 LTC2257-14 LTC2256-14
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
SNR Signal-to-Noise Ratio 5MHz Input
30MHz Input
70MHz Input
140MHz Input
l
72.4
74
73.8
73.7
73
71.9
73.4
73.2
73.1
72.6
71.2
72.9
72.8
72.1
71.8
dB
dB
dB
dB
SFDR Spurious Free Dynamic Range
2nd or 3rd Harmonic
5MHz Input
30MHz Input
70MHz Input
140MHz Input
l
78
90
90
90
84
80
90
90
90
84
80
90
90
90
84
dB
dB
dB
dB
Spurious Free Dynamic Range
4th Harmonic or Higher
5MHz Input
30MHz Input
70MHz Input
140MHz Input
l
85
90
90
90
90
85
90
90
90
90
85
90
90
90
84
dB
dB
dB
dB
S/(N+D)
Signal-to-Noise Plus
Distortion Ratio
5MHz Input
30MHz Input
70MHz Input
140MHz Input
l
71.5
73.8
73.7
73.6
72.5
71.5
73.2
73.1
73
72.3
70.7
72.8
72.7
72
71.2
dB
dB
dB
dB
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 Ω
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 Ω
V
REF
Line Regulation 1.7V < V
DD
< 1.9V 0.6 mV/V