DAC1020 datasheet(7/14 Pages) NSC

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DAC1020 Datasheet(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.

Part #	DAC1020

Description	10-Bit, 12-Bit Binary Multiplying D/A Converter

PDF	14 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

Logo

7 / 14 page

Typical Applications (Continued)

VOUT e

VREF

A12aA24aA38a A10

1024

where VREF can be an AC signal

By connecting the DAC in the feedback loop of an opera-

tional amplifier a linear digitally control gain block can be

realized

Note that with all digital inputs low the gain of the amplifier

is infinity that is the op amp will saturate In other words we

cannot divide the VREF by zero

FIGURE 10 Analog-to-Digital Divider (or Digitally Gain Controlled Amplifier)

VOUT e VREF

A10

1024

A10

1024

–

or VOUT e VREF

1023bN

where 0 s N s 1023

N e 0 for AN e all zeros

N e 1 for A10 e 1 A1–A9 e 0

N e 1023 for AN e all 1’s

FIGURE 11 Digitally controlled Amplifier-Attenuator

TLH5689 – 7

http

www nationalcom

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