Rainbow-electronics MAX1209 Manual de usuario descargar pdf (Pagina 4)

MAX1209

12-Bit, 80Msps, 3.3V IF-Sampling ADC

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

= 3.3V, OV

= 2.0V, GND = 0, REFIN = REFOUT (internal reference), V

= -0.5dBFS, CLKTYP = high, DCE = high, PD = low,

G/T = low, f

CLK

= 80MHz (50% duty cycle), T

= -40°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

INTERNAL REFERENCE (REFIN = REFOUT; V

REFP

, V

REFN

, and V

COM

are generated internally)

REFOUT Output Voltage V

REFOUT

1.984 2.048 2.070 V

COM Output Voltage V

COM

/ 2 1.65 V

Differential Reference Output

Voltage

REF

= V

REFP

- V

REFN

1.024 V

REFOUT Load Regulation 35 mV/mA

REFOUT Temperature Coefficient TC

REF

+50 ppm/°C

Short to V

—sinking 0.24

REFOUT Short-Circuit Current

Short to GND—sourcing 2.1

BUF F ERED EXTERNAL REF ERENCE (REF IN d ri ven extern al ly; V

R EF IN

= 2.048V, V

R EF P

, V

R EF N

, an d V

C OM

are g en erated in tern ally)

REFIN Input Voltage V

REFIN

2.048 V

REFP Output Voltage V

REFP

/ 2) + (V

REFIN

/ 4) 2.162 V

REFN Output Voltage V

REFN

/ 2) - (V

REFIN

/ 4) 1.138 V

COM Output Voltage V

COM

/ 2 1.60 1.65 1.70 V

Differential Reference Output

Voltage

REF

= V

REFP

- V

REFN

0.971 1.024 1.069 V

Differential Reference

Temperature Coefficient

±25 ppm/°C

REFIN Input Resistance >50 MΩ

UNBUFFERED EXTERNAL REFERENCE (REFIN = GND; V

REFP

, V

REFN

, and V

COM

are applied externally)

COM Input Voltage V

COM

/ 2 1.65 V

REFP Input Voltage V

REFP

- V

COM

0.512 V

REFN Input Voltage V

REFN

- V

COM

-0.512 V

Differential Reference Input

Voltage

REF

= V

REFP

- V

REFN

1.024 V

REFP Sink Current I

REFP

= 2.162V 1.1 mA

REFN Source Current I

REFN

= 1.138V 1.1 mA

COM Sink Current I

COM

0.3 mA

REFP, REFN Capacitance 13 pF

COM Capacitance 6pF

CLOCK INPUTS (CLKP, CLKN)

Single-Ended Input High

Threshold

CLKTYP = GND, CLKN = GND

0.8 x

Single-Ended Input Low

Threshold

CLKTYP = GND, CLKN = GND

0.2 x

Differential Input Voltage Swing CLKTYP = high 1.4 V

P-P

Differential Input Common-Mode

Voltage

CLKTYP = high V

/ 2 V

1 2 3 4 5 6 7 8 9 ... 26 27

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Rainbow-electronics MAX1209 Manual de usuario Pagina 4

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