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IF Undersampler
Power-Supply Bypassing and Grounding
The MAX1005 has separate analog (VCCA) and digital
________________Functional Diagram
(VCCD) power-supply connections, as well as separate
analog and digital ground connections to minimize cou-
TXEN
RXEN
VCCA
AGND
VCCD
DGND
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
DAC
BANDGAP
REFERENCE
ADC
BANDGAP
REFERENCE
ADC
CLOCK
DRIVER
CLK
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
AIO+
1k
VCCA
1k
5-BIT
FLASH ADC
5
DAC
CLOCK
DRIVER
±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-
AIO-
7-BIT DAC
7
DIGITAL
INTERFACE
MAX1005
7
D6–D0
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
________________________________________________________Package Information
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
? 1997 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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