ADC12DL066EVAL datasheet(4/23 Pages) NSC

Part #	ADC12DL066EVAL

Description	Dual 12-Bit, 66 MSPS, 450 MHz Input Bandwidth A/D Converter w/Internal Reference

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Manufacturer	NSC [National Semiconductor (TI)]

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Pin Descriptions and Equivalent Circuits (Continued)

Pin No.

Symbol

Equivalent Circuit

Description

24–29

34–39

DA0–DA11

Digital data output pins that make up the 12-bit conversion

results of their respective converters. DA0 and DB0 are the

LSBs, while DA11 and DB11 are the MSBs of the output

word. Output levels are TTL/CMOS compatible.

42–47

52–57

DB0–DB11

ANALOG POWER

9, 18, 19,

62, 63

V

A

Positive analog supply pins. These pins should be connected

to a quiet +3.3V source and bypassed to AGND with 0.1 µF

capacitors located within 1 cm of these power pins, and with

a 10 µF capacitor.

3, 8, 10, 17,

20, 61, 64

AGND

The ground return for the analog supply.

DIGITAL POWER

33, 48

V

D

Positive digital supply pin. This pin should be connected to

the same quiet +3.3V source as is V

A and be bypassed to

DGND with a 0.1 µF capacitor located within 1 cm of the

power pin and with a 10 µF capacitor.

32, 49

DGND

The ground return for the digital supply.

30, 51

V

DR

Positive digital supply pin for the ADC12DL066’s output

drivers. This pin should be connected to a voltage source of

+2.4V to V

D and be bypassed to DR GND with a 0.1 µF

capacitor. If the supply for this pin is different from the

supply used for V

A and VD, it should also be bypassed with

a 10 µF capacitor. V

DR should never exceed the voltage on

V

D. All bypass capacitors should be located within 1 cm of

the supply pin.

23, 31, 40,

50, 58

DR GND

The ground return for the digital supply for the

ADC12DL066’s output drivers. These pins should be

connected to the system digital ground, but not be

connected in close proximity to the ADC12DL066’s DGND or

AGND pins. See Section 5 (Layout and Grounding) for more

details.

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