MAX11642 datasheet(4/22 Pages) MAXIM

4 / 22 page

8-Bit, 16-/8-Channel, 300ksps ADCs

with FIFO and Internal Reference

_______________________________________________________________________________________

Note 2: Limits at TA = -40°C are guaranteed by design and not production tested.

Note 3: The MAX11639/MAX11643 tested at VDD = +3V. The MAX11638/MAX11642 tested at VDD = +5V.

Note 4: Offset nulled.

Note 5: Time for reference to power up and settle to within 1 LSB.

Note 6: Conversion time is defined as the number of clock cycles multiplied by the clock period; clock has 50% duty cycle.

Note 7: See Figure 3 (Equivalent Input Circuit) and the Sampling Error vs. Source Impedance curve in the

Typical Operating

Characteristics section.

Note 8: When CNVST is configured as a digital input, do not apply a voltage between VIL and VIH.

Note 9: Supply current is specified on whether an internal or external reference is used for voltage conversions.

ELECTRICAL CHARACTERISTICS (continued)

(VDD = +2.7V to +3.6V (MAX11639/MAX11643), VDD = +4.75V to +5.25V (MAX11638/MAX11642), fSAMPLE = 300kHz, fSCLK =

4.8MHz (external clock 50% duty cycle), VREF = 2.5V (MAX11639/MAX11643), VREF = 4.096V (MAX11638/MAX11642), TA = TMIN to

TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

DIGITAL INPUTS (SCLK, DIN,

CS, CNVST) (Note 8)

MAX11638/MAX11642

0.8

Input Voltage Low

VIL

MAX11639/MAX11643

VDD x 0.3

MAX11638/MAX11642

2.0

Input Voltage High

VIH

MAX11639/MAX11643

VDD x 0.7

Input Hysteresis

VHYST

200

Input Leakage Current

IIN

VIN = 0V or VDD

±0.01

±1.0

µA

Input Capacitance

CIN

DIGITAL OUTPUTS (DOUT,

EOC)

ISINK = 2mA

0.4

Output Voltage Low

VOL

ISINK = 4mA

0.8

Output Voltage High

VOH

ISOURCE = 1.5mA

VDD - 0.5

Three-State Leakage Current

CS = VDD

±0.05

±1

µA

Three-State Output

COUT

CS = VDD

POWER REQUIREMENTS

MAX11638/MAX11642

4.75

5.25

Supply Voltage

VDD

MAX11639/MAX11643

2.7

3.6

fSAMPLE = 300ksps

1750

2000

fSAMPLE = 0, REF on

1000

1200

Internal reference

Shutdown

0.2

fSAMPLE = 300ksps

1050

1200

MAX11639/MAX11643 Supply

Current (Note 9)

IDD

External reference

Shutdown

0.2

µA

fSAMPLE = 300ksps

2300

2550

fSAMPLE = 0, REF on

1000

1350

Internal reference

Shutdown

0.2

fSAMPLE = 300ksps

1550

1700

MAX11638/MAX11642 Supply

Current (Note 9)

IDD

External reference

Shutdown

0.2

µA

VDD = 2.7V to 3.6V, full-scale input

±0.2

±1

Power-Supply Rejection

PSR

VDD = 4.75V to 5.25V, full-scale input

±0.2

±1.4

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