LTC2220IUP-1#TRPBF【PDF 25/28 页】IC ADC 12BIT 185MSPS 64-QFN

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Sheet目录2005

21页 22页 23页 24页 [25页]26页 27页 28页

LTC2220-1

2220_1fa

600

500

400

100

200

300

INPUT FREQUENCY (MHz)

SFDR

(dBFS)

100

2220 G06

OUTPUT CODE

ERROR

(LSB)

4096

2220 G01

1024

2048

3072

1.0

0.8

0.6

0.4

0.2

– 0.2

– 0.4

– 0.6

– 0.8

– 1.0

TYPICAL PERFOR A CE 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 VDD, they will

be clamped by internal diodes. This product can handle input currents of

greater than 100mA below GND or above VDD without latchup.

Note 4: VDD= 3.3V, fSAMPLE= 185MHz, LVDS outputs, differential ENC+/ENC–

= 2VP-P sine wave, input range = 2VP-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: VDD = 3.3V, fSAMPLE = 185MHz, differential ENC

+/ENC– = 2VP-P sine

wave, input range = 1VP-P with differential drive, output CLOAD = 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.

ELECTRICAL CHARACTERISTICS

LTC2220-1: INL, 2V Range

LTC2220-1: DNL, 2V Range

LTC2220-1: Shorted Input Noise

Histogram

(TA = 25°C unless otherwise noted, Note 4)

LTC2220-1: SNR vs Input

Frequency, –1dB, 2V Range,

LVDS Mode

LTC2220-1: SFDR (HD2 and HD3)

vs Input Frequency, –1dB, 2V

Range, LVDS Mode

LTC2220-1: SNR vs Input

Frequency, –1dB, 1V Range,

LVDS Mode

2220 G02

OUTPUT CODE

ERROR

(LSB)

4096

1024

2048

3072

1.0

0.8

0.6

0.4

0.2

– 0.2

– 0.4

– 0.6

– 0.8

– 1.0

CODE

2056

229

140

12866

24266

93571

COUNT

100000

80000

60000

40000

20000

–0

2060

2220 G03

2057

2058

2059

INPUT FREQUENCY (MHz)

SNR

(dBFS)

600

500

400

2220 G04

100

200

300

SNR

(dBFS)

INPUT FREQUENCY (MHz)

600

500

400

100

200

300

2220 G05

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