Rainbow-electronics MAX1448 Bedienungsanleitung PDF herunterladen (Seite 12)

MAX1448

10-Bit, 80Msps, Single +3.0V, Low-Power

ADC with Internal Reference

12 ______________________________________________________________________________________

data is valid on the rising edge of the input clock. The

output data has an internal latency of 5.5 clock cycles.

Figure 6 also shows the relationship between the input

clock parameters and the valid output data.

Applications Information

Figure 7 shows a typical application circuit containing a

single-ended to differential converter. The internal refer-

ence provides a V

/2 output voltage for level shifting

purposes. The input is buffered and then split to a volt-

age follower and inverter. A lowpass filter follows the op

amps to suppress some of the wideband noise associ-

ated with high-speed op amps. The user may select the

ISO

and C

values to optimize the filter performance

to suit a particular application. For the application in

Figure 7, an RISO of 50Ω is placed before the capaci-

tive load to prevent ringing and oscillation. The 22pF

capacitor acts as a small bypassing capacitor.

100

20 4030 50 60 70

CLOCK DUTY CYCLE (%)

SFDR (dBc)

= 25.12MHz AT -0.5dB FS

Figure 3a. Spurious Free Dynamic Range vs. Clock Duty

Cycle (Differential Input)

20 4030 50 60 70

CLOCK DUTY CYCLE (%)

SNR (dB)

= 25.12MHz AT -0.5dB FS

Figure 3b. Signal-to-Noise Ratio vs. Clock Duty Cycle

(Differential Input)

-85

-75

-80

-65

-70

-55

-60

-50

20 4030 50 60 70

CLOCK DUTY CYCLE (%)

THD (dBc)

= 25.12MHz AT -0.5dB FS

Figure 4a. Total Harmonic Distortion vs. Clock Duty Cycle

(Differential Input)

20 4030 50 60 70

CLOCK DUTY CYCLE (%)

SINAD (dB)

= 25.12MHz AT -0.5dB FS

Figure 4b. Signal-to-Noise Plus Distortion vs. Clock Duty Cycle

(Differential Input)

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 18

ADC with Internal Reference 1

Kommentare zu diesen Handbüchern

Keine Kommentare

Rainbow-electronics MAX1448 Bedienungsanleitung Seite 12

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Sensoren Rainbow-electronics MAX1448