The AD5770R is a 6‑channel, 14‑bit resolution, low noise, programmable current output, digital-to-analog converter (DAC) for photonics control applications. The device incorporates a 1.25 V, on-chip voltage reference, a 2.5 kΩ precision resistor for reference current generation, die temperature, output monitoring functions, a fault alarm, and reset functions.
Key Features
► 6-channel, current output DAC
► 14-bit resolution programmable output current ranges
• Channel 0: 0 mA to 300 mA, −60 mA to +300 mA, −60 mA to 0 mA
• Channel 1: 0 mA to 140 mA, 0 mA to 250 mA
• Channel 2: 0 mA to 55 mA, 0 mA to 150 mA
• Channel 3, Channel 4, Channel 5: 0 mA to 45 mA, 0 mA to 100 mA
• All current sourcing output ranges scale back by up to 0.5×
Applications
► Photonics control
► LED driver programmable current source
► Current mode biasing
The EVAL-AD5770RSDZ is a fully featured evaluation board that is designed to help the user evaluate the AD5770R DAC. The EVAL-AD5770RSDZ evaluation board is controlled by the following two methods: the on-board P11 connector and the EVAL-SDP-CB1Z (Connector P10). The system development (SDP-B) board uses the AD5770R evaluation software to control the EVAL-AD5770RSDZ evaluation board via a Windows PC USB port.
The EVAL-AD5770RSDZ board contains a power solution that uses the ADP5073 switching regulator to generate −2 V from a +3.3 V supply and the ADP1741 linear regulator to generate +2 V from a +3.3 V supply. Alternatively, the AD5770R also uses a linear power supply connected through the nine onboard connectors (P0 to P8). The AD5770R incorporates an internal 1.25 V precision reference. The EVAL-AD5770RSDZ board contains an additional 1.25, V 0.5 ppm/°C voltage reference.
The AD5770R evaluation software provides an intuitive graphic user interface (GUI) that configures and controls the AD5770R over the serial peripheral interface (SPI).
The AD5770R is a 6-channel, 14-bit resolution, low noise, programmable current output DAC for photonics control applications. The output current ranges are software selectable, and channels are routed to the MUX_OUT pin for external monitoring.
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