MAX1003CAX-T Просмотр технического описания (PDF) - Maxim Integrated

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MAX1003CAX-T

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

Maxim Integrated 

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

0.1µF

_IN+

VSOURCE

_IN-

0.1µF

20k

0.22µF

_OCC+

_OCC-

OFFSET

CORREC-

TION

INPUT

AMP

20k

MAX1003

2.35V INTERNAL REFERENCE

Figure 2. Single-Ended AC-Coupled Input

OFFSET CORRECTION DISABLED

_OCC+ _OCC-

OFFSET

CORREC-

TION

_IN+

VSOURCE

_IN-

20k

VREF

1.75V TO 2.75V

INPUT

AMP

20k

MAX1003

2.35V INTERNAL REFERENCE

0.1µF _IN+

VSOURCE

_IN-

0.1µF

20k

0.22µF

_OCC+

_OCC-

OFFSET

CORREC-

TION

INPUT

AMP

20k

MAX1003

2.35V INTERNAL REFERENCE

Figure 3. Differential AC-Coupled Input

OFFSET CORRECTION DISABLED

_OCC+ _OCC-

OFFSET

CORREC-

TION

_IN+

VSOURCE

_IN-

20k

DIFFERENTIAL SOURCE

WITH COMMON MODE

FROM 1.75V TO 2.75V.

INPUT

AMP

20k

MAX1003

2.35V INTERNAL REFERENCE

Figure 4. Single-Ended DC-Coupled Input

Figure 5. Differential DC-Coupled Input

For applications where a DC component of the input

signal is present, Figures 4 and 5 show single-ended

and differential DC-coupled input circuits. The ampli-

fiers’ input common-mode voltage range extends from

1.75V to 2.75V. To prevent attenuation of the input

signal’s DC component in this mode, disable the offset-

correction amplifier by grounding the _OCC+ and

_OCC- pins for the I and Q blocks (Figures 4 and 5).

ADCs

The I and Q ADC blocks receive the analog signals

from the respective I and Q input amplifiers. The ADCs

use flash conversion with 63 fully differential compara-

tors to digitize the analog input signal into a 6-bit output

in offset binary format.

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