DAC7568A中文资料德州仪器数据手册PDF规格书

1 Features

1• Relative Accuracy:

– DAC7568 (12-Bit): 0.3 LSB INL

– DAC8168 (14-Bit): 1 LSB INL

– DAC8568 (16-Bit): 4 LSB INL

• Glitch Energy: 0.1nV-s

• Internal Reference:

– 2.5V Reference Voltage (disabled by default)

– 0.004% Initial Accuracy (typ)

– 2ppm/°C Temperature Drift (typ)

– 5ppm/°C Temperature Drift (max)

– 20mA Sink/Source Capability

• Power-On Reset to Zero Scale or Midscale

• Ultralow Power Operation: 1.25mA at 5V Including

Internal Reference Current

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

• Monotonic Over Entire Temperature Range

• Low-Power Serial Interface with Schmitt-Triggered

Inputs: Up to 50MHz

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

Operation

• Temperature Range: –40°C to +125°C

2 Applications

• Portable Instrumentation

• Closed-Loop Servo-Control/Process Control

• Data Acquisition Systems

• Programmable Attenuation, Digital Gain, and

Offset Adjustment

• Programmable Voltage and Current Sources

3 Description

The DAC7568, DAC8168, and DAC8568 are lowpower,

voltage-output, eight-channel, 12-, 14-, and

16-bit digital-to-analog converters (DACs),

respectively. These devices include a 2.5V, 2ppm/°C

internal reference (disabled by default), giving a fullscale

output voltage range of 2.5V or 5V. The internal

reference has an initial accuracy of 0.004% and can

source up to 20mA at the VREFIN/VREFOUT pin.

These devices are monotonic, providing excellent

linearity and minimizing undesired code-to-code

transient voltages (glitch). They use a versatile 3-wire

serial interface that operates at clock rates up to

50MHz. The interface is compatible with standard

SPI™, QSPI™, Microwire™, and digital signal

processor (DSP) interfaces.

The DAC7568, DAC8168, and DAC8568 incorporate

a power-on-reset circuit that ensures the DAC output

powers up at either zero scale or midscale until a

valid code is written to the device. These devices

contain a power-down feature, accessed over the

serial interface, that reduces current consumption to

typically 0.18μA at 5V. Power consumption (including

internal reference) is typically 2.9mW at 3V, reducing

to less than 1μW in power-down mode. The low

power consumption, internal reference, and small

footprint make these devices ideal for portable,

battery-operated equipment.

The DAC7568, DAC8168, and DAC8568 are drop-in

and function-compatible with each other, and are

available in TSSOP-16 and TSSOP-14 packages.