Overview
The DAC5688IRGC25, produced by Texas Instruments, is a dual-channel 16-bit digital-to-analog converter (DAC) designed for high-performance applications. This device operates at a maximum output update rate of 800 MSPS and features integrated 2x-8x interpolation filters, a fine frequency mixer with a 32-bit numerically controlled oscillator (NCO), and on-board IQ compensation. The DAC5688 offers superior linearity, noise, crosstalk, and PLL phase noise performance, making it suitable for demanding signal processing tasks.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Resolution | 16 | Bits | |||
| Maximum Output Update Rate | 800 | MSPS | |||
| Integral Nonlinearity (INL) | ±4 | LSB | |||
| Differential Nonlinearity (DNL) | ±2 | LSB | |||
| Output Settling Time to 0.1% | Transition: Code 0x0000 to 0xFFFF | 10.4 | ns | ||
| Output Propagation Delay | 2 | ns | |||
| Output Rise Time (10% to 90%) | 220 | ps | |||
| Output Fall Time (90% to 10%) | 220 | ps | |||
| Spurious Free Dynamic Range (SFDR) | x4 Interp, PLL off, CLK2 = 800 MHz, FOUT = 10.1 MHz | 83 | dBc | ||
| Power Dissipation | Mode 3: ×4 Interp, PLL on, QMC = on, ISINC = on | 1750 | mW |
Key Features
- Dual, 16-bit, 800 MSPS DACs with dual CMOS input data bus
- Integrated 2x-8x interpolation filters with over 80 dB of stop-band attenuation
- Complex mixer with 32-bit NCO for frequency upconversion
- Digital Quadrature Modulator Correction (QMC) for IQ compensation
- Digital Inverse SINC filter to compensate for DAC sin(x)/x frequency roll-off
- Flexible input data bus options: dual-bus data, single-bus interleaved data, even and odd multiplexing
- 16-sample input FIFO with external or internal clock
- 3- or 4-wire serial control interface
- On-chip 1.2-V reference and differential scalable output: 2 to 20 mA
- 64-pin 9×9mm QFN package
Applications
- Cellular Base Stations
- Broadband Wireless Access (BWA)
- WiMAX 802.16
- Fixed Wireless Backhaul
- Cable Modem Termination System (CMTS)
Q & A
- What is the maximum output update rate of the DAC5688?
The maximum output update rate of the DAC5688 is 800 MSPS.
- What types of interpolation filters are integrated into the DAC5688?
The DAC5688 features integrated 2x-8x interpolation filters.
- What is the purpose of the 32-bit NCO in the DAC5688?
The 32-bit NCO is used for frequency upconversion in complex mode.
- What is the function of the Digital Quadrature Modulator Correction (QMC) in the DAC5688?
The QMC feature allows for IQ compensation of phase, gain, and offset to maximize sideband rejection and minimize LO feed-through.
- What is the role of the Digital Inverse SINC filter in the DAC5688?
The Digital Inverse SINC filter compensates for the natural DAC sin(x)/x frequency roll-off.
- What are the different input data bus options available for the DAC5688?
The DAC5688 offers dual-bus data, single-bus interleaved data, and even and odd multiplexing at half-rate.
- What is the purpose of the 16-sample input FIFO in the DAC5688?
The 16-sample input FIFO is used to ease interface timing with either an external or internal clock.
- What is the package type and size of the DAC5688?
The DAC5688 is available in a 64-pin 9×9mm QFN package.
- What are some of the key applications for the DAC5688?
The DAC5688 is used in cellular base stations, broadband wireless access, WiMAX 802.16, fixed wireless backhaul, and cable modem termination systems.
- What is the operating temperature range of the DAC5688?
The DAC5688 is characterized for operation over the industrial temperature range of –40°C to 85°C.
