ADC12062EVAL datasheet(10/20 Pages) NSC

No de pièce	ADC12062EVAL

Description	12-Bit, 1.4 MHz, 300 mW A/D Converter with Input Multiplexer and Sample/Hold

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Fabricant	NSC [National Semiconductor (TI)]

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Pin Descriptions (Continued)

OE

This is the active high Output Enable

control input. This pin can be thought of

as an inverted version of the RD input

(see

Figure

6).

Data

output

pins

DB0–DB11 are TRI-STATE when OE is

low. Data appears on DB0–DB11 only

when OE is high and CS and RD are

both low. This pin can be tied high.

S/H

This is the Sample/Hold control input.

The analog input signal is held and a

new conversion is initiated by the falling

edge of this control input (when CS is

low).

PD

This is the Power Down control input.

This pin should be held high for normal

operation. When this pin is pulled low,

the device goes into a low power standby

mode.

V

REF+(FORCE),

V

REF−(FORCE)

These are the positive and negative volt-

age reference force inputs, respectively.

See Section 4, REFERENCE INPUTS,

for more information.

V

REF+(SENSE),

V

REF−(SENSE)

These are the positive and negative volt-

age reference sense pins, respectively.

See Section 4, REFERENCE INPUTS,

for more information.

V

REF/16

This pin should be bypassed to AGND

with a 0.1 µF ceramic capacitor.

TEST

This pin should be tied to DV

CC.

Functional Description

The ADC12762 performs a 12-bit analog-to-digital conver-

sion using a 3 step flash technique. The first flash deter-

mines the six most significant bits, the second flash gener-

ates four more bits, and the final flash resolves the two least

significant bits.

Figure 4 shows the major functional blocks of

the converter. It consists of a 21⁄2-bit Voltage Estimator, a re-

sistor ladder with two different resolution voltage spans, a

sample/hoId capacitor, a 4-bit flash converter with front end

multiplexer, a digitally corrected DAC, and a capacitive volt-

age divider. To pipeline the converter, there are two sample/

hold capacitors and 4-bit flash sections, which allows the

converter to acquire the next input sample while converting

the previous one. Only one of the flash converter pairs is

shown in

Figure 4 to reduce complexity.

DS012811-27

FIGURE 4. Functional Block Diagram

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