Rainbow-electronics MAX1446 User Manual download pdf (Page 13)

MAX1446

10-Bit, 60Msps, +3.0V, Low-Power

ADC with Internal Reference

______________________________________________________________________________________ 13

the input. Although a 1:1 transformer is shown, a step-

up transformer may be selected to reduce the drive

requirements. A reduced signal swing from the input

driver, such as an op amp, may also improve the over-

all distortion.

In general, the MAX1446 provides better SFDR and

THD with fully differential input signals than single-

ended drive, especially for very high input frequencies.

In differential input mode, even-order harmonics are

lower since both inputs (IN+, IN-) are balanced, and

each of the inputs only requires half the signal swing

compared to single-ended mode.

Single-Ended AC-Coupled

Input Signal

Figure 9 shows an AC-coupled, single-ended applica-

tion. The MAX4108 op amp provides high speed, high

bandwidth, low noise, and low distortion to maintain the

integrity of the input signal.

Grounding, Bypassing,

__________________and Board Layout

The MAX1446 requires high-speed board layout design

techniques. Locate all bypass capacitors as close to

the device as possible, preferably on the same side as

the ADC, using surface-mount devices for minimum

inductance. Bypass V

, REFP, REFN, and COM with

two parallel 0.1µF ceramic capacitors and a 2.2µF

bipolar capacitor to GND. Follow the same rules to

bypass the digital supply (OV

) to OGND. Multilayer

boards with separated ground and power planes pro-

duce the highest level of signal integrity. Consider

using a split ground plane arranged to match the physi-

cal location of the analog ground (GND) and the digital

OUTPUT

DATA D9–D0

DISABLE

ENABLE

HIGH-ZHIGH-Z

VALID DATA

Figure 5. Output Enable Timing

N - 6

N - 5

N + 1

N - 4

N + 2

N - 3

N + 3

N - 2

N + 4

N - 1

N + 5

N + 6

N + 1

5.5 CLOCK-CYCLE LATENCY

ANALOG INPUT

CLOCK INPUT

DATA OUTPUT

Figure 6. System and Output Timing Diagram

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

ADC with Internal Reference 1

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