Rainbow-electronics MAX1425 Manual do Utilizador descarregar pdf (Página 12)

MAX1425

10-Bit, 20Msps ADC

12 ______________________________________________________________________________________

Figure 5. Typical Application Circuit Using the Internal Reference

INPUT

50Ω

25Ω

-5V

+5V

0.1µF

BAS16

22pF

+5V

-5V

300Ω

600Ω

300Ω

INP

CML

INN

600Ω

2.5k

+5V

-5V

0.1µF

600Ω

300Ω

600Ω

300Ω

50Ω

2.5k

+5V

22pF

50Ω

BAS16

0.1µF

25Ω

MAX4108

MAX473A

MAX1425

MAX4108

heavy loads, as they are specified to deliver only

200µA for TTL compatibility. If an application needs

output buffering, use 74LS74s or 74ALS541s as

required.

Applications Information

Figure 5 depicts a typical application circuit containing

a single-ended to differential converter. The internal ref-

erence provides a +2.25V output for level shifting. The

input is buffered and then split to a voltage follower and

inverter. The op amps are followed by a lowpass filter

to remove some of the wideband noise associated with

high-speed op amps. In this application, the amplifier

outputs are directly coupled to the inputs. This configura-

tion can also be modified for AC-coupled applications.

The MAX1425 includes a DC level-shifting circuit internal

to the part, allowing for AC-coupled applications. The

level-shifting circuit is shown in Figure 6.

The circuit in Figure 6 can accept a 1Vp-p maximum

input voltage. With a maximum clock frequency of

20MHz, use 50Ω termination to minimize reflections.

Buffer the digital outputs with a low-cost, high-speed,

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

10-Bit, 20Msps ADC 1

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