MAX19538 datasheet(4/28 Pages) MAXIM

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12-Bit, 95Msps, 3.3V ADC

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ELECTRICAL CHARACTERISTICS (continued)

(VDD = 3.3V, OVDD = 1.8V, GND = 0, REFIN = REFOUT (internal reference), VIN = -0.5dBFS, CLKTYP = high, DCE = high, PD = low,

G/T = low, fCLK = 95MHz (50% duty cycle), TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

BUFFERED EXTERNAL REFERENCE (REFIN driven externally; VREFIN = 2.048V, VREFP, VREFN, and VCOM are generated

internally)

REFIN Input Voltage

VREFIN

2.048

REFP Output Voltage

VREFP

(VDD / 2) + (VREFIN x 3/8)

2.418

REFN Output Voltage

VREFN

(VDD / 2) - (VREFIN x 3/8)

0.882

COM Output Voltage

VCOM

VDD / 2

1.60

1.65

1.70

Differential-Reference Output

Voltage

VREF

VREF = VREFP - VREFN = VREFIN x 3/4

1.462

1.536

1.594

Differential-Reference

Temperature Coefficient

±25

ppm/°C

REFIN Input Resistance

>50

UNBUFFERED EXTERNAL REFERENCE (REFIN = GND; VREFP, VREFN, and VCOM are applied externally)

COM Input Voltage

VCOM

VDD / 2

1.65

REFP Input Voltage

VREFP - VCOM

+0.768

REFN Input Voltage

VREFN - VCOM

-0.768

Differential-Reference Input Voltage

VREF

VREF = VREFP - VREFN = VREFIN x 3/4

1.536

REFP Sink Current

IREFP

VREFP = 2.418V

1.4

REFN Source Current

IREFN

VREFN = 0.882V

1.0

COM Sink Current

ICOM

VCOM = 1.65V

1.0

REFP, REFN Capacitance

COM Capacitance

6pF

CLOCK INPUTS (CLKP, CLKN)

Single-Ended-Input High

Threshold

VIH

CLKTYP = GND, CLKN = GND

0.8 x

VDD

Single-Ended-Input Low

Threshold

VIL

CLKTYP = GND, CLKN = GND

0.2 x

VDD

Differential Input Voltage Swing

CLKTYP = high

1.4

VP-P

Differential Input Common-Mode

Voltage

CLKTYP = high

VDD / 2

Input Resistance

RCLK

Figure 5

Input Capacitance

CCLK

2pF

DIGITAL INPUTS (CLKTYP, DCE, G /

T , PD)

Input High Threshold

VIH

0.8 x

OVDD

Input Low Threshold

VIL

0.2 x

OVDD

VIH = OVDD

±5

Input Leakage Current

VIL = 0

±5

µA

Input Capacitance

CDIN

5pF

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