MAX1003CAX【PDF 11/12 页】IC ADC DUAL 6-BIT 90MSPS 36-SSOP

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MAX1003

The MAX1003 features a proprietary encoding scheme

that ensures no more than 1LSB dynamic encoding

error. Dynamic encoding errors resulting from

metastable states may occur when the analog input

voltage, at the time the sample is taken, falls close to

the decision point for any one of the input comparators.

The resulting output code for typical converters can be

incorrect, including false full- or zero-scale outputs. The

MAX1003’s unique design reduces the magnitude of

this type of error to 1LSB.

Internal Voltage Reference

An internal buffered bandgap reference is included on

the MAX1003 to drive the ADCs’ reference ladders. The

on-chip reference and buffer eliminate any external

(high-impedance) connections to the reference ladder,

minimizing the potential for noise coupling from exter-

nal circuitry while ensuring that the voltage reference,

input amplifier, and reference ladder track well with

variations of temperature and power supplies.

Oscillator Circuit

The MAX1003 includes a differential oscillator, which is

controlled by an external parallel resonant (tank) net-

work as shown in Figure 6. Alternatively, the oscillator

may be overdriven with an external clock source as

shown in Figure 7.

Internal Clock Operation (Tank)

If the tank circuit is used, the resonant inductor should

have a sufficiently high Q and a self-resonant frequen-

cy (SRF) of at least twice the intended oscillator fre-

quency. Coilcraft’s 1008HS-221, with an SRF of

700MHz and a Q of 45, works well for this application.

Generate different clock frequency ranges by adjusting

varactor and tank elements.

An internal clock-driver buffer is included to provide

sharp clock edges to the internal flash comparators.

The buffer ensures that the comparators are simultane-

ously clocked, maximizing the ADCs’ effective number

of bits (ENOB) performance.

Low-Power, 90Msps, Dual 6-Bit ADC

_______________________________________________________________________________________

Figure 6. Tank Resonator Oscillator

Figure 7. External Clock Drive Circuit

MAX1003

CLK

DRIVER

VARACTOR DIODE PAIR IS M/A-COM MA4ST079CK-287 (SOT23 PACKAGE)

INDUCTOR COILCRAFT 1008HS-221.

VTUNE = 0V TO 8V

fOSC = 70MHz TO 110MHz

TNK-

TNK+

VTUNE

220nH

5pF

47pF

47k

10k

MAX1003

CLK

DRIVER

TNK-

VCLK

VCLK = 300mVp-p TO 1.25Vp-p

TNK+

Z0 = 50

0.1

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