MAXQ7665A datasheet(6/47 Pages) MAXIM

6 / 47 page

16-Bit RISC Microcontroller-Based

Smart Data-Acquisition Systems

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ELECTRICAL CHARACTERISTICS (continued)

(AVDD = DVDDIO = +5.0V, DVDD = +3.3V, fSYSCLK = 8MHz, VREFDAC = VREFADC = +5V, TA = TMIN to TMAX, unless otherwise noted.

Typical values are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

DAC Glitch Impulse

From 7FFh to 800h

nV·s

DAC Power-On Time

Excluding reference, settling to ±0.5 LSB

µs

Power-Supply Rejection

AVDD step from +4.75V to +5.25V

µV/V

Output Noise

CL = 200pF

200

µVRMS

EXTERNAL REFERENCE INPUTS

REFADC Input-Voltage Range

1.0

5.0

AVDD

REFDAC Input-Voltage Range

5.0

AVDD

REFDAC Input Impedance

200

Ω

REFADC Leakage Current

ADC disabled

µA

TEMPERATURE SENSOR (Remote NPN Transistor 2N3904)

TA = +25°C

±1

TA = -30°C to +85°C

±2

Internal diode

TA = -40°C to +125°C

±5

TA = +25°C,

TRJ = +25°C

±2

TA = -30°C to +85°C,

TRJ = +25°C

±3

TA = -40°C to +125°C,

TRJ = +25°C

±3

TA = -30°C to +85°C,

TRJ = -30°C to +85°C

±3

Temperature Error

External diode,

differential

configuration

(Note 6)

TA = -40°C to +125°C,

TRJ = -40°C to +125°C

±5

°C

Internal (Die) or External

Temperature Measurement Error

vs. VREFADC Variation

0.095

°C/mV

High level

74.7

External Diode Source Current

Low level

µA

External Diode Drive Current Ratio

18.7:1

µA/µA

Conversion Time

fADCCLK = fSYSCLK = 8MHz, no interrupts,

internal utility ROM tempConv

µs

Temperature Resolution

12-bit ADC

0.125

°C/LSB

+3.3V LINEAR REGULATOR (CDVDD = 4.7µF)

DVDDIO Input-Voltage Range

4.25

5.0

5.25

DVDD Output Voltage

REGEN = GNDIO

3.0

3.4

3.6

DVDD Input-Voltage Range

REGEN = DVDDIO

3.0

3.6

No-Load Quiescent Current

CPU in sleep mode; all digital peripherals

disabled

µA

Output Short-Circuit Current

Short to DGND

110

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