Datasheet

LTC2228/LTC2227/LTC2226
3
222876fb
CONVERTER CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. (Note 4)
PARAMETER CONDITIONS
LTC2228 LTC2227 LTC2226
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
Resolution
(No Missing Codes)
l
12 12 12 Bits
Integral
Linearity Error
Differential Analog Input (Note 5)
l
–1.1 ±0.3 1.1 –1 ±0.3 1 –1 ±0.3 1 LSB
Differential
Linearity Error
Differential Analog Input
l
–0.8 ±0.15 0.8 –0.7 ±0.15 0.7 –0.7 ±0.15 0.7 LSB
Offset Error (Note 6)
l
–12 ±2 12 –12 ±2 12 –12 ±2 12 mV
Gain Error External Reference
l
–2.5 ±0.5 2.5 –2.5 ±0.5 2.5 –2.5 ±0.5 2.5 %FS
Offset Drift ±10 ±10 ±10 μV/°C
Full-Scale Drift Internal Reference ±30 ±30 ±30 ppm/°C
External Reference ±5 ±5 ±5 ppm/°C
Transition Noise SENSE = 1V 0.25 0.25 0.25 LSB
RMS
ANALOG INPUT
The l denotes the specifi cations which apply over the full operating temperature range, otherwise
specifi cations are at T
A
= 25°C. (Note 4)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Analog Input Range (A
IN
+
– A
IN
–
) 2.7V < V
DD
< 3.4V (Note 7)
l
±0.5V to ±1V V
V
IN,CM
Analog Input Common Mode (A
IN
+
+ A
IN
–
)/2 Differential Input (Note 7)
Single-Ended Input (Note 7)
l
l
1
0.5
1.5
1.5
1.9
2
V
V
I
IN
Analog Input Leakage Current 0V < A
IN
+
, A
IN
–
< V
DD
l
–1 1 μA
I
SENSE
SENSE Input Leakage 0V < SENSE < 1V
l
–3 3 μA
I
MODE
MODE Pin Leakage
l
–3 3 μA
t
AP
Sample-and-Hold Acquisition Delay Time 0 ns
t
JITTER
Sample-and-Hold Acquisition Delay Time Jitter 0.2 ps
RMS
CMRR Analog Input Common Mode Rejection Ratio 80 dB
Full Power Bandwidth Figure 8 Test Circuit 575 MHz
DYNAMIC ACCURACY
The l denotes the specifi cations which apply over the full operating temperature range,
otherwise specifi cations are at T
A
= 25°C. A
IN
= –1dBFS. (Note 4)
SYMBOL PARAMETER CONDITIONS
LTC2228 LTC2227 LTC2226
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
SNR Signal-to-Noise Ratio 5MHz Input 71.3 71.4 71.4 dB
12.5MHz Input
l
70.2 71.2 dB
20MHz Input
l
70.1 71.3 dB
30MHz Input
l
70 71.3 dB
70MHz Input 71.3 71.1 70.9 dB
140MHz Input 71 70.7 70.6 dB
SFDR Spurious Free
Dynamic Range
2nd or 3rd
Harmonic
5MHz Input 90 90 90 dB
12.5MHz Input
l
76 90 dB
20MHz Input
l
76 90 dB
30MHz Input
l
75 90 dB
70MHz Input 85 85 85 dB
140MHz Input 80 80 80 dB