DAC7512_15 datasheet(11/25 Pages) TI1

Teilenummer	DAC7512

Bauteilbeschribung	Low-Power, Rail-to-Rail Output, 12-Bit Serial Input

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Hersteller	TI1 [Texas Instruments]

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DAC7512

11

SBAS156B

www.ti.com

TYPICAL CHARACTERISTICS: VDD = +2.7V (Cont.)

At TA = +25°C, +VDD = +2.7V, unless otherwise noted.

EXITING POWER-DOWN

(800

H Loaded)

Time (5

µs/div)

CLK (2.7V/div)

V

OUT (1V/div)

CODE CHANGE GLITCH

Time (0.5

µs/div)

Loaded with 2k

Ω

and 200pF to GND.

Code Change:

800

H to 7FFH.

THEORY OF OPERATION

DAC SECTION

The DAC7512 is fabricated using a CMOS process. The

architecture consists of a string DAC followed by an output

buffer amplifier. Since there is no reference input pin, the

power supply (VDD) acts as the reference. Figure 1 shows a

block diagram of the DAC architecture.

OUTPUT AMPLIFIER

The output buffer amplifier is capable of generating rail-to-

rail voltages on its output which gives an output range of

0V to VDD. It is capable of driving a load of 2kΩ in parallel

with 1000pF to GND. The source and sink capabilities of the

output amplifier can be seen in the typical characteristics.

The slew rate is 1V/µs with a half-scale settling time of 8µs

with the output unloaded.

FIGURE 1. DAC7512 Architecture.

DAC Register

REF (+)

Resistor

String

REF(–)

Output

Amplifier

GND

V

DD

V

OUT

The input coding to the DAC7512 is straight binary, so the

ideal output voltage is given by:

VOUT = VDD •

D

4096

where D = decimal equivalent of the binary code that is

loaded to the DAC register; it can range from 0 to 4095.

RESISTOR STRING

The resistor string section is shown in Figure 2. It is simply

a string of resistors, each of value R. The code loaded into

the DAC register determines at which node on the string the

voltage is tapped off to be fed into the output amplifier by

closing one of the switches connecting the string to the

amplifier. It is tested monotonic because it is a string of

resistors.

FIGURE 2. Resistor String.

To Output

Amplifier

R

Ähnliche Beschreibung - DAC7512_15

Hersteller	Teilenummer	Datenblatt	Bauteilbeschribung
Texas Instruments	DAC707SH	1Mb / 27P	[Old version datasheet] Low-Power, Rail-to-Rail Output, 16-Bit Serial Input
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