MAX12558 datasheet(4/30 Pages) MAXIM

4 / 30 page

Dual, 80Msps, 14-Bit, IF/Baseband ADC

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ELECTRICAL CHARACTERISTICS (continued)

(VDD = 3.3V, OVDD = 2.0V, GND = 0, REFIN = REFOUT (internal reference), CL

≈ 10pF at digital outputs, VIN = -1dBFS (differential),

DIFFCLK/SECLK = OVDD, PD = GND, SHREF = GND, DIV2 = GND, DIV4 = GND, G/T = GND, fCLK = 80MHz (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

Overdrive Recovery Time

±10% beyond full scale

Clock

Cycle

INTERCHANNEL CHARACTERISTICS

fINA or fINB = 70MHz at -1dBFS

Crosstalk Rejection

fINA or fINB = 175MHz at -1dBFS

Gain Matching

±0.01

±0.1

Offset Matching

±0.01

%FSR

INTERNAL REFERENCE (REFOUT)

REFOUT Output Voltage

VREFOUT

2.000

2.048

2.080

REFOUT Load Regulation

-1mA < IREFOUT < +1mA

mV/mA

REFOUT Temperature Coefficient

TCREF

±50

ppm/°C

Short to VDD—sinking

0.24

REFOUT Short-Circuit Current

Short to GND—sourcing

2.1

BUFFERED REFERENCE MODE (REFIN is driven by REFOUT or an external 2.048V single-ended reference source;

VREFAP/VREFAN/VCOMA and VREFBP/VREFBN/VCOMB are generated internally)

REFIN Input Voltage

VREFIN

2.048

REFIN Input Resistance

RREFIN

> 50

Ω

COM_ Output Voltage

VCOMA

VCOMB

VCOM_ = VDD / 2

1.60

1.65

1.70

REF_P Output Voltage

VREFAP

VREFBP

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

2.418

REF_N Output Voltage

VREFAN

VREFBN

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

0.882

Differential Reference Voltage

VREFA

VREFB

VREF_ = VREF_P - VREF_N

1.456

1.536

1.595

Differential Reference

Temperature Coefficient

TCREF

±25

ppm/°C

UNBUFFERED EXTERNAL REFERENCE (REFIN = GND, VREFAP/VREFAN/VCOMA and VREFBP/VREFBN/VCOMB are applied

externally, VCOMA = VCOMB = VDD / 2)

REF_P Input Voltage

VREFAP

VREFBP

VREF_P - VCOM_

+0.768

REF_N Input Voltage

VREFAN

VREFBN

VREF_N - VCOM_

-0.768

COM_ Input Voltage

VCOM_

VCOM_ = VDD / 2

1.65

Differential Reference Voltage

VREFA

VREFB

VREF_ = VREF_P - VREF_N = VREFIN x 3/4

1.536

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