3

LTC1657

REFLO tied to GND, X1/X2 tied to GND, unless otherwise noted.

ELECTRICAL CHARACTERISTICS

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

of a device may be impaired.

Note 3: Nonlinearity is defined from code 128 to code 65535 (full scale).

See Applications Information.

Note 5: DAC switched between all 1s and all 0s.

Note 6: Guaranteed by design. Not subject to test.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

AC Performance

Voltage Output Slew Rate

(Note 5)

q

±0.3

±0.7

V/

µs

Voltage Output Settling Time

(Note 5) to 0.0015% (16-Bit Settling Time)

20

µs

(Note 5) to 0.012% (13-Bit Settling Time)

10

µs

Digital Feedthrough

0.3

nV •s

Midscale Glitch Impulse

8nV •s

Output Voltage Noise Spectral Density

At 1kHz

250

nV/

√Hz

Digital I/O

Digital Input High Voltage

q

2.4

V

Digital Input Low Voltage

q

0.8

V

Digital Output High Voltage

q

V

Digital Output Low Voltage

q

0.4

V

Digital Input Leakage

q

±10

µA

Digital Input Capacitance

(Note 6)

10

pF

Switching Characteristics

CS (MSB or LSB) Pulse Width

q

40

ns

WR Pulse Width

q

40

ns

CS to WR Setup

q

0ns

CS to WR Hold

q

0ns

Data Valid to WR Setup

q

40

ns

Data Valid to WR Hold

q

0ns

LDAC Pulse Width

q

40

ns

CLR Pulse Width

q

40

ns

Reference Output (REFOUT)

Reference Output Voltage

q

2.036

2.048

2.060

V

Reference Output

15

ppm/

°C

Temperature Coefficient

Reference Line Regulation

q

±1.5

mV/V

Reference Load Regulation

q

5

mV/A

Short-Circuit Current

REFOUT Shorted to GND

q

50

100

mA

Reference Input

REFHI, REFLO Input Range

(Note 6) See Applications Information

q

V

X1/X2 Tied to GND

q

V

REFHI Input Resistance

q

16

25

k

Ω