Rainbow-electronics MAX1011 Uživatelský manuál stáhnout pdf (Strana 6)

MAX1011

amplifier inputs is internally biased to a 2.35V reference

through a 20kΩ resistor, eliminating external DC bias

circuits. A series 0.1µF capacitor is required at the

amplifier input for AC-coupled signals.

When operating with AC-coupled inputs, the input

amplifier’s DC offset voltage is nulled to within ±1/2LSB

by an on-chip, offset-correction amplifier. An external

compensation capacitor is required to set the dominant

pole of the offset-correction amplifier’s frequency

response (Figures 2 and 3). The compensation capaci-

tor will determine the low-frequency corner of the ana-

log input response according to the following formula:

= 1 / (0.1 x C)

where C is the value of the compensation capacitor in

µF, and f

is the corner frequency in Hz.

Low-Power, 90Msps, 6-Bit ADC

6 _______________________________________________________________________________________

6 BITS

DATA

BUFFER

DIGITAL

DEMODULATOR

DSP

DCLK

TANK

MAX1011

Figure 1. IF Sampling Receiver

Figure 2. Single-Ended AC-Coupled Input

Figure 3. Differential AC-Coupled Input

MAX1011

INPUT

AMP

20k

2.35V INTERNAL REFERENCE

20k

IN+

OCC+ OCC-

IN-

0.1µF

0.22µF

SOURCE

0.1µF

OFFSET

CORREC-

TION

MAX1011

INPUT

AMP

20k

2.35V INTERNAL REFERENCE

20k

IN+

OCC+ OCC-

IN-

0.1µF

SOURCE

OFFSET

CORREC-

TION

0.22µF

1 2 3 4 5 6 7 8 9 10 11 12

Low-Power, 90Msps, 6-Bit ADC 1

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