MAX1183ECM+TD【PDF 7/18 页】IC ADC 10BIT 40MSPS DL 48-TQFP

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component is 90 degree phase-shifted with respect to

the in-phase component. At the receiver, the QAM signal

is divided down into its I and Q components, essentially

representing the modulation process reversed. Figure 8

displays the demodulation process performed in the

analog domain, using the dual matched 3V, 10-bit ADC

(MAX1183), and the MAX2451 quadrature demodulator

to recover and digitize the I and Q baseband signals.

Before being digitized by the MAX1183, the mixed-down

signal components may be filtered by matched analog

filters, such as Nyquist or pulse-shaping filters, which

remove any unwanted images from the mixing process,

thereby enhancing the overall signal-to-noise (SNR) per-

formance and minimizing intersymbol interference.

Grounding, Bypassing, and

Board Layout

The MAX1183 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 VDD, REFP, REFN, and COM with

two parallel 0.1F ceramic capacitors and a 2.2F

bipolar capacitor to GND. Follow the same rules to

bypass the digital supply (OVDD) to OGND. Multilayer

boards with separated ground and power planes pro-

duce the highest level of signal integrity. Consider the

use of a split ground plane arranged to match the

physical location of the analog ground (GND) and the

digital output driver ground (OGND) on the ADC’s

package. The two ground planes should be joined at a

single point such that the noisy digital ground currents

do not interfere with the analog ground plane. The ideal

location of this connection can be determined experi-

mentally at a point along the gap between the two

ground planes, which produces optimum results. Make

this connection with a low-value, surface-mount resistor

MAX1183

Dual 10-Bit, 40Msps, 3V, Low-Power ADC with

Internal Reference and Parallel Outputs

______________________________________________________________________________________

MAX1183

N.C.

VIN

22pF

0.1F

2.2F

MINICIRCUITS

TT1–6

N.C.

VIN

22pF

0.1F

2.2F

MINICIRCUITS

TT1–6

INA-

INA+

INB-

INB+

COM

Figure 6. Transformer-Coupled Input Drive

MAX1183

0.1F

100

CIN

22pF

CIN

22pF

INB+

INB-

COM

INA+

INA-

0.1F

RISO

REFP

REFN

VIN

MAX4108

0.1F

100

CIN

22pF

CIN

22pF

0.1F

RISO

REFP

REFN

VIN

MAX4108

Figure 7. Using an Op Amp for Single-Ended, AC-Coupled

Input Drive

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