DAC8718SPAGR.A中文资料德州仪器数据手册PDF规格书

1FEATURES

2345• Bipolar Output: ±2V to ±16.5V

• Unipolar Output: 0V to +33V

• 16-Bit Resolution

• Low Power: 14.4mW/Ch (Bipolar Supply)

• Relative Accuracy: 4 LSB Max

• Low Zero/Full-Scale Error

– Before User Calibration: ±10 LSB Max

– After User Calibration: ±1 LSB

• Flexible System Calibration

• Low Glitch: 4nV-s

• Settling Time: 15μs

• Channel Monitor Output

• Programmable Gain: x4/x6

• Programmable Offset

• SPI™: Up to 50MHz, 1.8V/3V/5V Logic

• Schmitt Trigger Inputs

• Daisy-Chain with Sleep Mode Enhancement

• Packages: QFN-48 (7x7mm), TQFP-64

(10x10mm)

APPLICATIONS

• Automatic Test Equipment

• PLC and Industrial Process Control

• Communications

DESCRIPTION

The DAC8718 is a low-power, octal, 16-bit

digital-to-analog converter (DAC). With a 5V

reference, the output can either be a bipolar ±15V

voltage when operating from dual ±15.5V (or higher)

power supplies, or a unipolar 0V to +30V voltage

when operating from a +30.5V (or higher) power

supply. With a 5.5V reference, the output can either

be a bipolar ±16.5V voltage when operating from dual

±17V (or higher) power supplies, or a unipolar 0V to

+33V voltage when operating from a +33.5V (or

higher) power supply. This DAC provides low-power

operation, good linearity, and low glitch over the

specified temperature range of –40°C to +105°C. This

device is trimmed in manufacturing and has very low

zero-code and gain error. In addition, system level

calibration can be performed to achieve ±1 LSB bipolar zero/full-scale error with bipolar supplies, or

±1 LSB zero code/full-scale error with a unipolar

supply, over the entire signal chain. The output range

can be offset by using the DAC offset register.

The DAC8718 features a standard, high-speed serial

peripheral interface (SPI) that operates at up to 50MHz and is 1.8V, 3V, and 5V logic compatible, to

communicate with a DSP or microprocessor. The

input data of the device are double-buffered. An

asynchronous load input (LDAC) transfers data from

the DAC data register to the DAC latch. The

asynchronous CLR input sets the output of all eight

DACs to AGND. The VMON pin is a monitor output

that connects to the individual analog outputs, the

offset DAC, the reference buffer outputs, and two

external inputs through a multiplexer (mux).

The DAC8718 is pin-to-pin and function-compatible

with the DAC8218 (14-bit) and the DAC7718 (12-bit).