4

LTC1666/LTC1667/LTC1668

ELECTRICAL CHARACTERISTICS

LTC1666/LTC1667/LTC1668

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Analog Output

Full-Scale Output Current

q

110

mA

Output Compliance Range

q

–1

1

V

q

0.7

1.1

1.5

k

Ω

Output Capacitance

5pF

Reference Output

Reference Voltage

2.475

2.5

2.525

V

Reference Output Drift

25

ppm/

°C

Reference Output Load Regulation

6

mV/mA

Reference Input

Reference Small-Signal Bandwidth

20

kHz

Power Supply

Positive Supply Voltage

q

4.75

5

5.25

V

Negative Supply Voltage

q

–4.75

–5

–5.25

V

Positive Supply Current

q

35

mA

Negative Supply Current

q

33

40

mA

Power Dissipation

180

mW

85

mW

Dynamic Performance (Differential Transformer Coupled Output, 50

Ω Double Terminated, Unless Otherwise Noted)

Maximum Update Rate

q

50

75

Msps

Output Settling Time

To 0.1% FSR

20

ns

Output Propagation Delay

8ns

Glitch Impulse

Single Ended

15

pV-s

Differential

5

pV-s

Output Rise Time

4ns

Output Fall Time

4ns

Output Noise

50

pA/

√Hz

Digital Inputs

Digital High Input Voltage

q

2.4

V

Digital Low Input Voltage

q

0.8

V

Digital Input Current

q

±10

µA

Digital Input Capacitance

5pF

Input Setup Time

q

8ns

Input Hold Time

q

4ns

Clock High Time

q

5ns

Clock Low Time

q

8ns

Note 1: Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

Note 2: For the LTC1666,

±1LSB = ±0.024% of full scale;

for the LTC1667,

±1LSB = ±0.006% of full scale = ±61ppm of full scale;

for the LTC1668,

±1LSB = ±0.0015% of full scale = ±15.3ppm of full scale.