Rainbow-electronics MAX1422 Manual do Utilizador descarregar pdf (Página 3)

MAX1422

12-Bit, 20Msps, +3.3V, Low-Power ADC with

Internal Reference

_______________________________________________________________________________________ 3

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Common-Mode Input Voltage

Range (Note 5)

CMVR

CML

±5%

Differential Input Range V

INP

- V

INN

(Note 6) ±V

DIFF

Small-Signal Bandwidth BW

-3dB

(Note 7) 400 MHz

Large-Signal Bandwidth FPBW

-3dB

(Note 7) 150 MHz

Overvoltage Recovery OVR 1.5

FS input 1

Clock

Cycle

INTERNAL REFERENCE (REFIN bypassed with 0.22µF in parallel with 1nF)

Common-Mode Reference

Voltage

CML

At CML V

AVDD

0.5 V

Positive Reference Voltage V

REFP

At REFP

CML

+ 0.512

Negative Reference Voltage V

REFN

At REFN

CML

- 0.512

Differential Reference Voltage V

DIFF

= V

REFP

- V

REFN

1.024

±5%

Differential Reference

Temperature Coefficient

REFTC ±100 ppm/°C

EXTERNAL REFERENCE (V

REFIN

= +2.048V)

REFIN Input Resistance R

(Note 8) 5 kΩ

REFIN Input Capacitance C

10 pF

REFIN Reference Input Voltage

Range

REFIN

2.048

±10%

Differential Reference Voltage

Range

DIFF

= (V

REFP

- V

REFN

)

0.95

REFIN

1.05

REFIN

EXTERNAL REFERENCE (V

REFIN

= AGND, reference voltage applied to REFP, REFN, and CML)

REFP, REFN, CML Input Current I

-200 200 µA

REFP, REFN, CML Input

Capacitance

15 pF

Differential Reference Voltage

Range

DIFF

= V

REFP

- V

REFN

1.024

±10%

CML Input Voltage Range V

CML

1.65

±10%

REFP Input Voltage Range V

REFP

CML

DIFF

REFN Input Voltage Range V

REFN

CML

DIFF

DIGITAL INPUTS (CLK, CLK, PD, OE)

Input Logic High V

0.7

DVDD

Input Logic Low V

0.3

DVD

ELECTRICAL CHARACTERISTICS (continued)

AVDD

= V

DVDD

= +3.3V, AGND = DGND = 0, V

= ±1.024V, differential input voltage at -0.5dB FS, +2.048V internal reference, f

CLK

20MHz (50% duty cycle), digital output load C

≈ 10pF, T

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

= +25°C.)

1 2 3 4 5 6 7 8 ... 14 15

Internal Reference 1

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