1FEATURES

2• Bipolar Output: ±3V, up to ±16.5V

• Unipolar Output: 0V to +33V

• 14-Bit Resolution

• Low Power: 13.5mW/Ch

• Relative Accuracy: 1LSB Max

• Flexible User Calibration

• Low Zero/Full-Scale Error

– Before User Calibration: ±2.5 LSB Max

– After User Calibration: ±1 LSB

• Low Glitch: 4nV-s

• Settling Time: 15μs

• Channel Monitor Output

• Programmable Gain: x4, x6

• Programmable Offset

• 14-Bit Parallel Interface:

50MHz (Write Operation)

• Packages: QFN-56 (8mm x 8mm),

TQFP-64 (10mm x 10mm)

APPLICATIONS

• Automatic Test Equipment

• PLC and Industrial Process Control

• Communications

DESCRIPTION

The DAC8228 is a low-power, octal, 14-bit

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

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

voltage when operating from a dual ±15.5V (or

higher) power supply, or a unipolar 0V to +30V

voltage when operating from a +30.5V power supply.

With a 5.5V reference, the output can be ±16.5V for a

dual ±17V (or higher) power supply, 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 and full-scale error. In addition, user calibration

can be performed to achieve ±1 LSB bipolar

zero/full-scale error for a bipolar supply, or ±1 LSB zero-code/full-scale error for a unipolar supply over

the entire signal chain. The output range can be

offset by using the DAC Offset Register.

The DAC8228 features a standard, high-speed, 14-bit

parallel interface that operates at up to 50MHz and is

1.8V, 3V, and 5V logic compatible, to communicate

with a DSP or microprocessor. The eight DACs and

the auxiliary registers are addressed with five address

lines. The device features double-buffered interface

logic. 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, and the reference buffer outputs

through a multiplexer (mux).

The DAC8228 is pin-to-pin compatible with the

DAC8728 (16-bit) and the DAC7728 (12-bit).