LTC1744 datasheet(9/24 Pages) LINER

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LTC1744

1744f

SENSE (Pin 1): Reference Sense Pin. Ground selects

±1V. VDD selects ±1.6V. Greater than 1V and less than

1.6V applied to the SENSE pin selects an input range of

±VSENSE, ±1.6V is the largest valid input range.

VCM (Pin 2): 2.5V Output and Input Common Mode Bias.

Bypass to ground with 4.7

µF ceramic chip capacitor.

GND (Pins 3, 6, 9, 12, 13, 16, 19, 21, 36, 37): ADC

Power Ground.

AIN+ (Pin 4): Positive Differential Analog Input.

AIN– (Pin 5): Negative Differential Analog Input.

VDD (Pins 7, 8, 17, 18, 20): 5V Supply. Bypass to AGND

with 1

µF ceramic chip capacitor.

REFLB (Pin 10): ADC Low Reference. Bypass to Pin 11 with

0.1

µF ceramic chip capacitor. Do not connect to Pin 14.

REFHA (Pin 11): ADC High Reference. Bypass to Pin 10 with

0.1

µFceramicchipcapacitor,toPin14witha4.7µFceramic

capacitor and to ground with 1

µF ceramic capacitor.

REFLA (Pin 14): ADC Low Reference. Bypass to Pin 15 with

0.1

µFceramicchipcapacitor,toPin11witha4.7µFceramic

capacitor and to ground with 1

µF ceramic capacitor.

REFHB (Pin 15): ADC High Reference. Bypass to Pin 14 with

0.1

µF ceramic chip capacitor. Do not connect to Pin 11.

PI FU CTIO S

MSBINV (Pin 22): MSB Inversion Control. Low inverts

the MSB, 2’s complement output format. High does not

invert the MSB, offset binary output format.

ENC (Pin 23): Encode Input. The input sample starts on

the positive edge.

ENC (Pin 24): Encode Complement Input. Conversion

starts on the negative edge. Bypass to ground with 0.1

µF

ceramic for single-ended encode signal.

OE (Pin 25): Output Enable. Low enables outputs. Logic

high makes outputs Hi-Z.

CLKOUT (Pin 26): Data Valid Output. Latch data on the

rising edge of CLKOUT.

OGND (Pins 27, 38, 47): Output Driver Ground.

D0-D3 (Pins 28 to 31): Digital Outputs. D0 is the LSB.

OVDD (Pins 32, 43): Positive Supply for the Output Driv-

ers. Bypass to ground with 0.1

µF ceramic chip capacitor.

D4-D6 (Pins 33 to 35): Digital Outputs.

D7-D10 (Pins 39 to 42): Digital Outputs.

D11-D13 (Pins 44 to 46): Digital Outputs. D13 is the MSB.

OF (Pin 48): Over/Under Flow Output. High when an over

or under flow has occurred.

TYPICAL PERFOR A CE CHARACTERISTICS (Note 5)

FREQUENCY (MHz)

–60

–30

0.5

–10

–20

–40

–50

–70

–80

–100

–110

–130

–140

816

24.99

1744 G36

–90

–120

–150

246

10 12 14

18 20 22 24

TA = 25°C

FREQUENCY (MHz)

–60

–30

0.5

–10

–20

–40

–50

–70

–80

–100

–110

–130

–140

816

24.99

1744 G37

–90

–120

–150

246

10 12 14

18 20 22 24

TA = 25°C

Input = 5MHz, –25dBFS, No Dither

Input = 5MHz, –25dBFS,

Dither Applied

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