IF Undersampler

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implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

© 1997 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

Power-Supply Bypassing and Grounding

The MAX1005 has separate analog (VCCA) and digital

(VCCD) power-supply connections, as well as separate

analog and digital ground connections to minimize cou-

pling of noisy digital signals into the circuit’s analog por-

tion. The device will operate with both of these power

supplies connected to any voltage between +2.7V and

+5.5V. This feature allows the digital circuitry to operate

from a regulated logic power supply; this reduces power

consumption and maintains compatibility with external

logic, while allowing the analog circuitry to operate from

an unregulated supply.

The analog ground (AGND) and digital ground (DGND)

should be tied together close to the device. At no time

should the voltage between AGND and DGND exceed

±0.3V.

The entire board needs good DC bypassing for both

analog and digital supplies. Place the power-supply

bypass capacitors close to where the power is routed

onto board. 10µF electrolytic capacitors with low equiva-

lent-series-resistance (ESR) ratings are recommended.

For best effective bits performance, minimize capacitive

loading at the digital outputs. Keep the digital output

traces as short as possible. Bypass each of the VCC_

supply pins to its respective GND with high-quality

ceramic capacitors located as close to the package as

possible.

___________________Chip Information

TRANSISTOR COUNT: 2377

SUBSTRATE CONNECTED TO AGND

5-BIT

FLASH ADC

VCCA

5

7

DAC

BANDGAP

REFERENCE

ADC

BANDGAP

REFERENCE

DIGITAL

INTERFACE

TXEN

RXEN

ADC

CLOCK

DRIVER

1k

1k

AIO+

AIO-

7-BIT DAC

MAX1005

VCCA

AGND

VCCD

DGND

CLK

DAC

CLOCK

DRIVER

D6–D0

7

________________Functional Diagram

________________________________________________________Package Information