Datasheet

LTC2258-12
LTC2257-12/LTC2256-12
4
225812fd
For more information www.linear.com/LTC2258-12
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 0.625V < 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
LTC2258-12 LTC2257-12 LTC2256-12
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
SNR Signal-to-Noise Ratio 5MHz Input
30MHz
70MHz Input
140MHz Input
l
69
71.1
71
70.9
70.7
69.6
70.8
70.7
70.6
70.4
69
70.5
70.5
70.1
69.9
dB
dB
dB
dB
SFDR Spurious Free Dynamic Range
2nd or 3rd Harmonic
5MHz Input
30MHz
70MHz Input
140MHz Input
l
78
90
90
90
84
79
90
90
90
84
79
90
90
90
84
dB
dB
dB
dB
Spurious Free Dynamic Range
4th Harmonic or Higher
5MHz Input
30MHz
70MHz Input
140MHz Input
l
83
90
90
90
90
83
90
90
90
90
83
90
90
90
84
dB
dB
dB
dB
S/(N+D)
Signal-to-Noise Plus
Distortion Ratio
5MHz Input
30MHz
70MHz Input
140MHz Input
l
69.1
71
71
70.9
70.3
68.9
70.7
70.6
70.6
70.2
68.3
70.5
70.4
70
69.5
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