Overview
The AD9765ASTRL, produced by Analog Devices Inc., is a 12-bit, high-speed, dual-port, 2-channel CMOS digital-to-analog converter (DAC). This component integrates two high-quality TxDAC+® cores, a voltage reference, and digital interface circuitry into a compact 48-lead LQFP package. The AD9765 is optimized for processing I and Q data in communications applications and offers exceptional AC and DC performance, supporting update rates of up to 125 MSPS.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 12 | - | - | Bits |
| Integral Linearity Error (INL) | -1.5 | ±0.4 | +1.5 | LSB (at 25°C) |
| Differential Nonlinearity (DNL) | -0.75 | ±0.3 | +0.75 | LSB (at 25°C) |
| Offset Error | -0.02 | - | +0.02 | % of FSR |
| Gain Error (Without Internal Reference) | -2 | ±0.25 | +2 | % of FSR |
| Gain Match | -1.6 | ±0.1 | +1.6 | % of FSR |
| Maximum Output Update Rate (fCLK) | - | - | 125 | MSPS |
| Output Settling Time (tST) to 0.1% | - | - | 35 | ns |
| Output Propagation Delay (tPD) | - | - | 1 | ns |
| Power Supply Voltage | 3.3 | - | 5.0 | V |
| Power Consumption | - | - | 380 | mW |
Key Features
- Dual 12-bit, 125 MSPS DACs optimized for low distortion performance and flexible transmission of I and Q information.
- Exceptional AC and DC performance with a maximum output update rate of 125 MSPS.
- Gain matching of typically 0.1% of full scale and offset error better than 0.02%.
- Low power operation with a power consumption of 380 mW from a single 3.3 V to 5 V supply.
- On-chip 1.20 V temperature-compensated band gap voltage reference.
- Dual-port or interleaved data input mode, allowing for flexible data interface configurations.
- Separate write inputs and clocks for independent control of each DAC port.
- Differential current output supporting single-ended or differential applications.
- Full-scale current adjustable from 2 to 20 mA via external resistors.
Applications
- Communications: Base stations, digital synthesis, and quadrature modulation.
- 3D ultrasound systems.
- Any application requiring high-speed, high-accuracy DACs for processing I and Q data.
Q & A
- What is the resolution of the AD9765ASTRL DAC?
The AD9765ASTRL has a resolution of 12 bits.
- What is the maximum output update rate of the AD9765ASTRL?
The maximum output update rate is 125 MSPS.
- What is the typical gain matching between the two DACs?
The gain matching is typically 0.1% of full scale.
- How is the full-scale current of the DACs controlled?
The full-scale current can be set independently using two external resistors or collectively using a single external resistor.
- What is the power consumption of the AD9765ASTRL?
The power consumption is 380 mW from a single 3.3 V to 5 V supply.
- Does the AD9765ASTRL have an on-chip voltage reference?
Yes, it includes a 1.20 V temperature-compensated band gap voltage reference.
- What are the supported input data modes for the AD9765ASTRL?
The AD9765ASTRL supports dual-port or interleaved data input modes.
- Can the two DAC ports be updated independently?
Yes, separate write inputs and clocks allow for independent control of each DAC port.
- What is the output type of the AD9765ASTRL DACs?
The DACs provide differential current output, supporting single-ended or differential applications.
- What are some common applications of the AD9765ASTRL?
Common applications include communications base stations, digital synthesis, quadrature modulation, and 3D ultrasound systems.
