Rainbow-electronics MAX1421 Instrukcja Użytkownika Pobierz pdf (Strona 5)

MAX1421

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

with Internal Reference

_______________________________________________________________________________________ 5

Note 1: Internal reference, REFIN bypassed to AGND with a combination of 0.22µF in parallel with 1nF capacitor.

Note 2: External +2.048V reference applied to REFIN.

Note 3: Internal reference disabled. V

REFIN

= 0, V

REFP

= +2.162V, V

CML

= +1.65V, and V

REFN

= +1.138V.

Note 4: IMD is measured with respect to either of the fundamental tones.

Note 5: Specifies the common-mode range of the differential input signal supplied to the MAX1421.

Note 6: V

DIFF

= V

REFP

- V

REFN

Note 7: Input bandwidth is measured at a 3dB level.

Note 8: V

REFIN

is internally biased to +2.048V through a 10kΩ resistor.

Note 9: Measured as the ratio of the change in mid-scale offset voltage for a ± 5% change in V

AVDD

using the internal reference.

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

Pipeline Delay (Latency) Figure 5 7

CLK

cycles

Aperture Delay t

Figure 9 2 ns

Aperture Jitter t

Figure 9 2 ps

Data Output Delay t

Figure 5 5 10 14 ns

Bus Enable Time t

Figure 4 5 ns

Bus Disable Time t

Figure 4 5 ns

Typical Operating Characteristics

AVDD

= V

DVDD

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

= ±1.024V, differential input voltage, f

CLK

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

load C

= 10pF, T

= T

MIN

to T

MAX,

unless otherwise noted. Typical values are at T

= +25°C.)

-120

-80

-100

-40

-60

-20

01051520

FFT PLOT, 4096-POINT RECORD,

DIFFERENTIAL INPUT

MAX1421 toc01

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dB)

= 7.5439934MHz

= -0.45dB FS

HD3

HD2

-120

-80

-100

-40

-60

-20

01051520

FFT PLOT, 4096-POINT RECORD,

DIFFERENTIAL INPUT

MAX1421 toc02

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dB)

= 19.9047628MHz

= -0.50dB FS

HD2

HD3

-120

-80

-100

-40

-60

-20

01051520

FFT PLOT, 4096-POINT RECORD,

DIFFERENTIAL INPUT

MAX1421 toc03

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dB)

= 38.5440183MHz

= -0.49dB FS

HD3

HD2

1 2 3 4 5 6 7 8 9 10 ... 16 17

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