LTC2220_15 Datasheet, PDF (6/32 Pages) Linear Technology – 12-Bit,170Msps/ 135Msps ADCs

LTC2220/LTC2221
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All voltage values are with respect to ground with GND and OGND
wired together (unless otherwise noted).
Note 3: When these pin voltages are taken below GND or above V_DD, they will
be clamped by internal diodes. This product can handle input currents of
greater than 100mA below GND or above V_DD without latchup.
Note 4: V_DD = 3.3V, f_SAMPLE = 170MHz (LTC2220) or 135MHz (LTC2221),
LVDS outputs, differential ENC⁺/ENC^– = 2V_P-P sine wave, input range =
2V_P-P with differential drive, unless otherwise noted.
Note 5: Integral nonlinearity is defined as the deviation of a code from a “best
straight line” fit to the transfer curve. The deviation is measured from the
center of the quantization band.
Note 6: Offset error is the offset voltage measured from –0.5 LSB when the
output code flickers between 0000 0000 0000 and 1111 1111 1111 in 2’s
complement output mode.
Note 7: Guaranteed by design, not subject to test.
Note 8: Recommended operating conditions.
Note 9: V_DD = 3.3V, f_SAMPLE = 170MHz (LTC2220) or 135MHz (LTC2221),
differential ENC⁺/ENC^– = 2V_P-P sine wave, input range = 1V_P-P with differential
drive, output C_LOAD = 5pF.
Note 10: SNR minimum and typical values are for LVDS mode. Typical values
for CMOS mode are typically 0.3dB lower.
Note 11: SFDR minimum values are for LVDS mode. Typical values are for
both LVDS and CMOS modes.
Note 12: SINAD minimum and typical values are for LVDS mode. Typical
values for CMOS mode are typically 0.3dB lower.
TYPICAL PERFOR A CE CHARACTERISTICS (T_A = 25°C unless otherwise noted, Note 4)
LTC2220: INL, 2V Range
1.0
0.8
LTC2220: DNL, 2V Range
1.0
0.8
LTC2220: Shorted Input Noise
Histogram
100000
93571
0.6
0.6
80000
0.4
0.4
0.2
0.2
60000
0
0
– 0.2
– 0.4
– 0.6
– 0.8
– 1.0
0
1024
2048
3072
OUTPUT CODE
4096
2220 G01
– 0.2
– 0.4
– 0.6
– 0.8
– 1.0
0
1024
2048
3072
OUTPUT CODE
4096
2220 G02
40000
20000
–0
229
2056
24266
2057
2058
CODE
12866
2059
140
2060
2220 G03
LTC2220: SNR vs Input
Frequency, –1dB, 2V Range,
LVDS Mode
70
69
68
67
66
65
64
63
62
61
60
0 100 200 300 400 500 600
INPUT FREQUENCY (MHz)
2220 G04
LTC2220: SNR vs Input
Frequency, –1dB, 1V Range,
LVDS Mode
70
69
68
67
66
65
64
63
62
61
60
0 100 200 300 400 500 600
INPUT FREQUENCY (MHz)
2220 G05
LTC2220: SFDR (HD2 and HD3)
vs Input Frequency, –1dB, 2V
Range, LVDS Mode
100
90
80
70
60
50
40
0 100 200 300 400 500 600
INPUT FREQUENCY (MHz)
2220 G06
22201fa
6