DAC7728

SBAS461A – JUNE 2009 – REVISED NOVEMBER 2009

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ELECTRICAL CHARACTERISTICS: Single-Supply (continued)

DGND = 0V, and OFFSET-A = OFFSET-B = AGND, unless otherwise noted.

DAC7728

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

1

nV-s

200

nV/

√Hz

Output noise

130

nV/

√Hz

0.1Hz to 10Hz, gain = 6

20

0.05

LSB

2000

Ω

Three-state leakage current

100

nA

REFERENCE INPUT

1.0

5.5

V

Reference input dc impedance

10

M

Ω

Reference input capacitance

10

pF

3.8

V

2.3

V

1.5

V

–0.3

0.8

V

–0.3

0.6

V

–0.3

0.3

V

CLR, LDAC, RST, A0 to A4, R/W, and CS

±1

μA

Input current

USB/BTC, RSTSEL, and D0 to D11

±5

μA

CLR, LDAC, RST, A0 to A4, R/W, and CS

5

pF

Input capacitance

USB/BTC, RSTSEL, and D0 to D11

12

pF

GPIO

14

pF

V

(D0 to D11)

1.6

V

0

0.4

V

to D11, BUSY, and GPIO)

0

0.2

V

High-impedance leakage current

D0 to D11, BUSY, and GPIO

±5

μA

High-impedance output

BUSY and GPIO

14

pF

capacitance

(11) Digital feedthrough is the glitch impulse injected to the output of a DAC as a result of a digital code change in the DAC input register of

the same DAC. It is measured with the full-scale digital code change without updating the DAC output, and is expressed in nV-s.

(13) 8000

(14) Reference input voltage

(15) Specified by design.

8

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