Overview
The AD9765AST, produced by Analog Devices Inc., is a high-performance, dual-port, 2-channel, 12-bit 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 AD9765AST 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 TA = 25°C) |
| Differential Nonlinearity (DNL) | -0.75 | ±0.3 | +0.75 | LSB (at TA = 25°C) |
| Output Update Rate (fCLK) | - | - | 125 | MSPS |
| Output Settling Time (tST) (to 0.1%) | - | - | 35 | ns |
| Output Propagation Delay (tPD) | - | - | 1 | ns |
| Full-Scale Current (IOUTFS) | - | - | 20 | mA |
| Supply Voltage | 3.3 | - | 5 | V |
| Power Consumption | - | - | 380 | mW (at 5 V) |
| Operating Temperature Range | -40 | - | 85 | °C |
Key Features
- Dual-port, high-speed, 2-channel, 12-bit CMOS DACs with integrated TxDAC+® cores, voltage reference, and digital interface circuitry.
- Supports update rates up to 125 MSPS and is optimized for processing I and Q data in communications applications.
- Utilizes a segmented current source architecture combined with a proprietary switching technique to reduce glitch energy and maximize dynamic accuracy.
- Provides differential current outputs, supporting single-ended or differential applications.
- Full-scale currents between each DAC are matched to within 0.1%.
- Operates from a single supply of 3.3 V to 5 V and consumes 380 mW of power.
- Power-down mode reduces standby power dissipation to approximately 50 mW.
- Available in a 48-lead LQFP package.
Applications
- Communications: Base stations, digital synthesis, and quadrature modulation.
- 3D ultrasound systems.
- Other high-speed data conversion applications requiring low distortion and high dynamic accuracy.
Q & A
- What is the resolution of the AD9765AST DAC?
The AD9765AST has a resolution of 12 bits.
- What is the maximum update rate of the AD9765AST?
The AD9765AST supports update rates up to 125 MSPS.
- What is the full-scale current output of the AD9765AST?
The full-scale current output of the AD9765AST is 20 mA.
- How is the gain control managed on the AD9765AST?
The gain control can be set using either two external resistors or a single external resistor, depending on the mode selected via the GAINCTRL pin.
- What is the operating temperature range of the AD9765AST?
The operating temperature range of the AD9765AST is from -40°C to +85°C.
- What is the power consumption of the AD9765AST at 5 V supply voltage?
The power consumption of the AD9765AST at 5 V supply voltage is 380 mW.
- Can the AD9765AST operate in power-down mode?
- What type of package is the AD9765AST available in?
The AD9765AST is available in a 48-lead LQFP package.
- What are the typical applications of the AD9765AST?
The AD9765AST is typically used in communications applications such as base stations, digital synthesis, and quadrature modulation, as well as in 3D ultrasound systems.
- How does the AD9765AST handle I and Q data in communications applications?
The AD9765AST is optimized for processing I and Q data in communications applications, with a digital interface that includes two double-buffered latches and control logic. It can interface to two separate data ports or a single interleaved high-speed data port.
