DAC7678SPW.B中文资料德州仪器数据手册PDF规格书

1FEATURES

23• Relative Accuracy:

– 1 LSB INL

• Glitch Energy: 0.15nV-s

• Internal Reference:

– 2.5V Reference Voltage (disabled by

default)

– ±5mV Initial Accuracy (max)

– 5ppm/°C Temperature Drift (typ)

– 25ppm/°C Temperature Drift (max)

– 20mA Sink/Source Capability

• Power-On Reset to Zero Scale or Midscale

– Devices in the TSSOP Package Reset to

Zero Scale

– Devices in the QFN Package Reset to Zero

Scale or Midscale

• Ultra-Low Power Operation: 0.13mA/Channel

at 5V (without internal reference current)

• Wide Power-Supply Range: +2.7V to +5.5V

• 2-Wire Serial Interface ( I2C™ compatible)

• On-Chip Output Buffer Amplifier with Rail-to-

Rail Operation

• Temperature Range: –40°C to +125°C

APPLICATIONS

• Portable Instrumentation

• Closed-Loop Servo-Control

• Process Control

• Data Acquisition Systems

• Programmable Attenuation

• PC Peripherals

DESCRIPTION

The DAC7678 is a low-power, voltage-output, octal

channel, 12-bit digital-to-analog converter (DAC). The

DAC7678 includes a 2.5V internal reference (disabled

by default), giving a full-scale output voltage range of

5V. The internal reference has an initial accuracy of

±5mV and can source up to 20mA at the

VREFIN/VREFOUT pin. The device is monotonic,

provides very good linearity, and minimizes undesired

code-to-code transient voltages (glitch).

The DAC7678 uses a versatile, 2-wire serial interface

that is I2C-compatible and operates at clock rates of

up to 3.4MHz. Multiple devices can share the same

bus.

The DAC7678 incorporates a power-on-reset circuit

that ensures the DAC output powers up to either

zero-scale or mid-scale until a valid code is written to the device. These devices contain a power-down

feature, accessed over the serial interface that

reduces the current consumption of the device to

typically 0.42μA at 5V. Power consumption (including

internal reference) is typically 3.56mW at 3V,

reducing to 0.68μW in power-down mode. The low

power consumption, internal reference, and small

footprint make this device ideal for portable, batteryoperated

equipment. The DAC7678 is drop-in and

functionally compatible with DAC5578, DAC6578,

and DAC7578. All devices are available in a 4x4

QFN-24 package and a TSSOP-16 package.