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1654

Dual 14-Bit Rail-to-Rail DAC in 16-Lead SSOP Package

Linear Technology 

LTC1654

ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating tempera-

ture range, otherwise specifications are at TA = 25°C. Unless otherwise noted, VCC = 2.7V to 5.5V, VOUT A, VOUT B unloaded, REFHI A,

REFHI B = 4.096V (VCC = 5V), REFHI A, REFHI B = 2.048V (VCC = 2.7V), REFLO = 0V, X1/X1/2 = 0V.

SYMBOL PARAMETER

CONDITIONS

MIN TYP MAX

UNITS

AC Performance

Voltage Output Slew Rate

(Note 8) SLOW

(Note 8) FAST

●

0.20

0.9

V/µs

●

1.25

3.8

V/µs

Voltage Output Settling Time

(Note 4) to ±1LSB, SLOW

(Note 4) to ±1LSB, FAST

8.5

µs

3.0

µs

Digital Feedthrough

(Note 7)

1

nV•s

Midscale Glitch Impulse

DAC Switch Between 8000 and 7FFF

20

nV•s

Output Noise Voltage Density

at 10kHz, SLOW

at 10kHz, FAST

170

nV/√Hz

150

nV/√Hz

Digital I/O

VIH

Digital Input High Voltage

VIL

Digital Input Low Voltage

VOH

Digital Output High Voltage

VOL

Digital Output Low Voltage

VIH

Digital Input High Voltage

VIL

Digital Input Low Voltage

VOH

Digital Output High Voltage

VOL

Digital Output Low Voltage

ILEAK

Digital Input Leakage

CIN

Digital Input Capacitance

Reference Input

VCC = 5V

VCC = 5V

VCC = 5V, IOUT = – 1mA, DOUT Only

VCC = 5V, IOUT = 1mA, DOUT Only

VCC = 3V

VCC = 3V

VCC = 3V, IOUT = – 1mA, DOUT Only

VCC = 3V, IOUT = 1mA, DOUT Only

VIN = GND to VCC

(Note 6)

●

2.4

●

● VCC – 0.4

●

●

2.4

●

● VCC – 0.4

●

●

V

0.8

V

V

0.4

V

V

0.8

V

V

0.4

V

± 10

µA

10

pF

Reference Input Resistance

REFHI to REFLO

●

30

60

kΩ

Reference Input Range

Reference Input Current

(Note 6)

In Shutdown

●

0

●

VCC

V

1

µA

Switching Characteristics (VCC = 4.5V to 5.5V)

t1

SDI Valid to SCK Setup

t2

SDI Valid to SCK Hold

t3

SCK High Time

t4

SCK Low Time

t5

CS/LD Pulse Width

t6

LSB SCK to CS/LD

t7

CS/LD Low to SCK

t8

SD0 Output Delay

t9

SCK Low to CS/LD Low

t10

CLR Pulse Width

Switching Characteristics (VCC = 2.7V to 5.5V)

t1

SDI Valid to SCK Setup

t2

SDI Valid to SCK Hold

t3

SCK High Time

t4

SCK Low Time

t5

CS/LD Pulse Width

t6

LSB SCK to CS/LD

t7

CS/LD Low to SCK

(Note 6)

(Note 6)

(Note 6)

(Note 6)

(Note 6)

(Note 6)

CLOAD = 100pF

(Note 6)

(Note 6)

(Note 6)

(Note 6)

(Note 6)

(Note 6)

(Note 6)

(Note 6)

●

30

●

0

●

15

●

15

●

15

●

10

●

10

●

5

●

10

●

30

●

45

●

0

●

20

●

20

●

20

●

15

●

15

ns

ns

ns

ns

ns

ns

ns

100

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

1654fb

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