MAX1221 datasheet(4/44 Pages) MAXIM

4 / 44 page

12-Bit, Multichannel ADCs/DACs with FIFO,

Temperature Sensing, and GPIO Ports

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ELECTRICAL CHARACTERISTICS (continued)

(AVDD = DVDD = 2.7V to 5.25V, external reference VREF = 2.5V, fCLK = 3.6MHz (50% duty cycle), TA = -40°C to +85°C, unless other-

wise noted. Typical values are at AVDD = DVDD = 3V. TA = +25°C. Outputs are unloaded, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

VREF = 2.5V, fSAMPLE = 225ksps

REF1 Input Current (Note 9)

IREF1

Acquisition between conversions

±0.01

±1

µA

VREF = 2.5V, fSAMPLE = 225ksps

REF2 Input Current

IREF2

Acquisition between conversions

±0.01

±1

µA

DAC

DC ACCURACY (Note 10)

Resolution

Bits

Integral Nonlinearity

INL

±0.5

±4

LSB

Differential Nonlinearity

DNL

Guaranteed monotonic

±1.0

LSB

Offset Error

VOS

(Note 8)

±3

±10

Offset-Error Drift

±10

ppm of

FS/°C

Gain Error

(Note 8)

±5

±10

LSB

Gain Temperature Coefficient

±8

ppm of

FS/°C

DAC OUTPUT

No load

0.02

AVDD -

0.02

Output Voltage Range

10k

Ω load to either rail

0.1

AVDD -

0.1

DC Output Impedance

0.5

Capacitive Load

(Note 11)

Resistive Load to AGND

AVDD = 2.7V, VREF = 2.5V,

gain error < 1%

2000

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