AD5778R Series

2-Channel, 300 mA Current Source Output 16-Bit SoftSpan DAC

Catalog

2-Channel, 300 mA Current Source Output 16-Bit SoftSpan DAC

Part	Number of Bits	Output Type	Operating Temperature [Max]	Operating Temperature [Min]	Reference Type	INL/DNL (LSB)	Architecture	Data Interface	Settling Time	Voltage - Supply, Analog [Min]	Voltage - Supply, Analog [Max]	Differential Output	Supplier Device Package	Mounting Type	Voltage - Supply, Digital [Min]	Voltage - Supply, Digital [Max]
Analog Devices AD5778RBCPZ	16	Current - Unbuffered	125 °C	-40 °C	External Internal	0.2 LSB 12 LSB	Current Steering	3-Wire Serial Microwire SPI	8.7 ms	2.85 V	5.5 V		32-QFN (5x5)	Surface Mount	1.71 V	5 V

Catalog

2-Channel, 300 mA Current Source Output 16-Bit SoftSpan DAC

Key Features

• Per channel programmable output ranges: 300 mA, 200 mA, 100 mA, 50 mA, 25 mA, 12.5 mA, 6.25 mA, and 3.125 mA

• Flexible 2.85 V to 33 V supply voltage

• 1 V dropout guaranteed

• Separate voltage supply per output channel

• Internal switches to optional negative supply

• Full 16-bit resolution at all ranges

• Guaranteed operation –40°C to 125°C

• Precision (10 ppm/°C maximum) internal reference or external reference input

• Analog mux monitors, voltages, and currents

• A/B toggle via SPI or dedicated pin

• 1.8 V to 5 V SPI

• 32-lead (5 mm × 5 mm) QFN package

Description

The AD5778R is a 2-channel, 16-bit current source digital-to-analog converter (DAC), providing two high-compliance current source outputs with a guaranteed 1 V dropout at 200 mA. The device supports load voltages of up to 32 V. There are eight current ranges, programmable per channel, with full-scale outputs of up to 300 mA. Additionally, the channels can be paralleled to allow for ultrafine adjustments of large currents or for combined outputs of up to 600 mA.A dedicated supply pin is provided for every output channel. Each channel can be operated from 2.85 V to 33 V, and internal switches allow any output to be pulled to the optional negative supply.The AD5778R includes a precision integrated 1.25 V reference (10 ppm/°C maximum), with the option to use an external reference.The SPI-/Microwire-compatible 3-wire serial interface operates on logic levels as low as 1.71 V at clock rates up to 50 MHz.APPLICATIONSTunable lasersSemiconductor optical amplifiersResistive heatersCurrent-mode biasingProportional solenoid drive