Rainbow-electronics MAX1421 Manual de usuario descargar pdf (Pagina 4)

MAX1421

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

with Internal Reference

4 _______________________________________________________________________________________

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 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, OE, PD)

Input Logic High V

0.7

DVDD

Input Logic Low V

0.3

DVDD

CLK, CLK ±330

PD -20 20

Input Current

OE -20 20

µA

Input Capacitance 10 pF

DIGITAL OUTPUTS (D0–D11)

Output Logic High V

= 200µA

DVDD

- 0.5

DVDD

Output Logic Low V

= -200µA 0 0.5 V

Three-State Leakage -10 10 µA

Three-State Capacitance 2pF

POWER REQUIREMENTS

Analog Supply Voltage V

AVDD

3.135 3.3 3.465 V

Digital Supply Voltage V

DVDD

2.7 3.3 3.6 V

Analog Supply Current I

AVDD

52 65 mA

Analog Supply Current with

Internal Reference in Shutdown

REFIN = AGND 50 63 mA

Analog Shutdown Current PD = DV

20 µA

Digital Supply Current I

DVDD

5.5 mA

Digital Shutdown Current PD = DV

20 µA

Power Dissipation P

DISS

Analog power 188 214 mW

Power-Supply Rejection Ratio PSRR (Note 9) ±1 mV/V

TIMING CHARACTERISTICS

Clock Frequency f

CLK

Figure 5 0.1 40 MHz

Clock High t

Figure 5, clock period 25ns 12.5 ns

Clock Low t

Figure 5, clock period 25ns 12.5 ns

1 2 3 4 5 6 7 8 9 ... 16 17

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Rainbow-electronics MAX1421 Manual de usuario Pagina 4

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