LTC1668I datasheet(4/16 Pages) LINER

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LTC1668

TYPICAL PERFOR A CE CHARACTERISTICS

FREQUENCY (1.25MHz/DIV)

0.05

–45

–25

–5

1668 G01

–65

–85

–55

–35

–15

–75

–95

–105

6.3

12.55

fCLOCK = 25Msps

fOUT = 1.007MHz

AMPLITUDE = 0dBFS

= –8.5dBm

SFDR = 86dBc

Single Tone SFDR

2-Tone SFDR

FREQUENCY (0.2MHz/DIV)

3.2

–50

–30

–10

1668 G02

–70

–90

–60

–40

–20

–80

–100

–110

4.2

5.2

fCLOCK = 50Msps

fOUT1 =

4.028MHz

fOUT2 =

4.419MHz

AMPLITUDE 1, 2

= –6dBFS

= –14.5dBm

SFDR > 77dBc

Integral Nonlinearity

Differential Nonlinearity

DIGITAL INPUT CODE

–5

–4

–2

–1

16384

32768

1668 G03

–3

49152

65535

DIGITAL INPUT CODE

1.0

65535

1668 G04

–1.0

–2.0

16384

32768

49152

2.0

–0.5

0.5

–1.5

1.5

PI FU CTIO S

REFOUT (Pin 15): Internal Reference Voltage Output.

Nominal value is 2.5V. Requires a 0.1

µF bypass capacitor

to AGND.

IREFIN (Pin 16): Reference Input Current. Nominal value is

1.25mA for IFS = 10mA. IFS = IREFIN • 8.

AGND (Pin 17): Analog Ground.

LADCOM (Pin 18): Attenuator Ladder Common. Normally

tied to GND.

IOUT B (Pin 19): Complementary DAC Output Current. Full-

scale output current occurs when all data bits are 0s.

IOUT A (Pin 20): DAC Output Current. Full-scale output

current occurs when all data bits are 1s.

COMP1 (Pin 21): Current Source Control Amplifier Com-

pensation. Bypass to VSS with 0.1µF.

COMP2 (Pin 22): Internal Bypass Point. Bypass to VSS

with 0.1

µF.

VSS (Pin 23): Negative Supply Voltage. Nominal value is

– 5V.

DGND (Pin 24): Digital Ground.

VDD (Pin 25): Positive Supply Voltage. Nominal value is 5V.

CLK (Pin 26): Clock Input. Data is latched and the output

is updated on positive edge of clock.

DB15 to DB0 (Pins 27, 28, 1 to 14): Digital Input Data Bits.

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