Rainbow-electronics MAX1420 Manual do Utilizador descarregar pdf (Página 5)

MAX1420

12-Bit, 60Msps, +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 MAX1420.

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, f

CLK

62.5MHz (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

Power Dissipation In Shutdown P

DISS

PD = V

DVDD

10 µW

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

TIMING CHARACTERISTICS

Maximum Clock Frequency f

CLK

60 MHz

Clock High t

Figure 6, clock period 16.667ns 8.33 ns

Clock Low t

Figure 6, clock period 16.667ns 8.33 ns

Pipeline Delay (Latency) Figure 6 7

CLK

cycles

Aperture Delay t

Figure 10 2 ns

Aperture Jitter t

Figure 10 2 ps

Data Output Delay t

Figure 6 5 10 14 ns

Bus Enable Time t

Figure 5 5 ns

Bus Disable Time t

Figure 5 5 ns

Typical Operating Characteristics

AVDD

= V

DVDD

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

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

CLK

= 60.006MHz (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

030

FFT PLOT (8192-POINT DATA RECORD)

DIFFERENTIAL INPUT

MAX1420 toc01

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dB)

10 1552025

HD2

HD3

= 5.5449583MHz

-120

-80

-100

-40

-60

-20

030

FFT PLOT (8192-POINT DATA RECORD)

DIFFERENTIAL INPUT

MAX1420 toc02

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dB)

10 1552025

HD2

HD3

= 13.4119138MHz

-120

-80

-100

-40

-60

-20

030

FFT PLOT (8192-POINT DATA RECORD)

DIFFERENTIAL INPUT

MAX1420 toc03

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dB)

10 1552025

HD2

HD3

= 37.701219MHz

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

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