Rainbow-electronics MAX1421 Uživatelský manuál stáhnout pdf (Strana 3)

MAX1421

12-Bit, 40Msps, +3.3V, Low-Power ADC

with Internal Reference

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ELECTRICAL CHARACTERISTICS (continued)

AVDD

= V

DVDD

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

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

CLK

= 40MHz (50% duty cycle), digital output load C

≈ 10pF, T

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Differential Gain DG ±1%

Differential Phase DP ±0.25 degrees

ANALOG INPUTS (INP, INN, CML)

Input Resistance R

Either input to ground 32.5 kΩ

Input Capacitance C

Either input to ground 4 pF

Common-Mode Input Level,

(Note 5)

CML

AVDD

× 0.5

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

Over-Voltage Recovery OVR 1.5

FS input 1

Clock

Cycle

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

Common-Mode Reference Input

Voltage

CML

At CML

AVDD

0.5

Positive Reference Voltage

Range

REFP

At REFP

CML

+ 0.512

Negative Reference Voltage

Range

REFN

At REFN

CML

- 0.512

Differential Reference Voltage

Range

DIFF

= V

REFP

- V

REFN

1.024

±5%

Differential Reference

Temperature Coefficient

REFTC ±100 ppm/°C

EXTER N AL R EF ER EN C E

REFIN Input Resistance R

(Note 8) 5 kΩ

REFIN Input Capacitance C

10 pF

REFIN Reference Input Voltage V

REFIN

2.048

±10%

Differential Reference Voltage V

DIFF

= (V

REFP

- V

REFN

)

0.95

REFIN/2

1.05

REFIN/2

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

1 2 3 4 5 6 7 8 ... 16 17

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