Overview
The AD9777BSVRL from Analog Devices Inc. is a 16-bit, high-speed dual Interpolating TxDAC+® digital-to-analog converter. It is part of a pin-compatible family of converters designed for high-performance applications. The AD9777 features a maximum input data rate of 160 MSPS and a maximum DAC update rate of 400 MSPS with selectable interpolation rates of 2x, 4x, or 8x. This device is particularly suited for communications and instrumentation systems that require high dynamic range and multicarrier capabilities.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Number of Bits | - | - | 16 | - |
| Sampling Rate (MSPS) | - | - | 160 | MSPS |
| Interpolation Rates | - | - | 2x, 4x, 8x | - |
| Supply Voltage | 3.1 | 3.3 | 3.5 | V |
| Power Dissipation | - | 1.2 | - | W |
| Operating Temperature | -40 | - | 85 | °C |
| Package Type | - | - | 80-Lead TQFP (12mm x 12mm) | - |
| Logic 1 Voltage | 2.1 | 3 | - | V |
| Logic 0 Voltage | 0 | 0.9 | - | V |
| Clock Input Voltage Range | 0 | - | 3 | V |
| Differential Voltage | 0.5 | 1.5 | - | V |
| Maximum SCLK Frequency | - | - | 15 | MHz |
Key Features
- High-speed dual Interpolating TxDAC+® converter with up to 16-bit resolution and 160 MSPS input data rate.
- Selectable interpolation rates of 2x, 4x, or 8x, allowing for a maximum DAC update rate of 400 MSPS.
- Internal PLL clock multiplier and programmable clock divider for flexible clock generation.
- Versatile clock input compatible with differential or single-ended sine wave or digital logic inputs.
- Flexible data input interface supporting straight binary or two's complement formats and single-port interleaved or dual-port data.
- Dual high-performance DAC outputs with differential current output programmable over a 2 mA to 20 mA range.
- Single 3.3 V supply operation with on-chip 1.2 V reference.
- Excellent AC performance with SFDR of -73 dBc @ 2 MHz to 35 MHz and WCDMA ACPR of 71 dB @ IF = 19.2 MHz.
- SPI interface for easy configuration and control.
- Image rejection feature when used with an external quadrature modulator, reducing the need for signal band filters.
- Direct IF mode for synthesizing intermediate frequencies above 70 MHz, eliminating the need for a costly mixer stage.
Applications
- Communications systems, including 3G, multicarrier GSM, TDMA, CDMA, and broadband wireless.
- Point-to-point microwave radios.
- Instrumentation and Automated Test Equipment (ATE).
- High-performance systems employing high-order QAM modulation schemes.
- Analog quadrature modulation architecture for baseband I/Q and image reject upconversion.
Q & A
- What is the maximum input data rate of the AD9777?
The maximum input data rate of the AD9777 is 160 MSPS.
- What are the selectable interpolation rates of the AD9777?
The AD9777 supports selectable interpolation rates of 2x, 4x, or 8x.
- What is the maximum DAC update rate with interpolation?
The maximum DAC update rate with interpolation is 400 MSPS (8x interpolation).
- What type of clock input does the AD9777 support?
The AD9777 supports differential or single-ended sine wave or digital logic inputs for the clock.
- What is the power dissipation of the AD9777?
The typical power dissipation of the AD9777 is 1.2 W at 3.3 V supply.
- What is the operating temperature range of the AD9777?
The operating temperature range of the AD9777 is -40°C to +85°C.
- What is the package type of the AD9777BSVRL?
The AD9777BSVRL comes in an 80-Lead Thin Quad Flat Package (TQFP_EP).
- How does the AD9777 handle image rejection?
The AD9777 can perform image rejection when used with an external quadrature modulator, reducing the need for additional signal band filters.
- What is the direct IF mode in the AD9777?
The direct IF mode allows the synthesis of intermediate frequencies (IFs) above 70 MHz, eliminating the need for a costly mixer stage.
- What interface does the AD9777 use for configuration and control?
The AD9777 uses a 3- or 4-wire SPI interface for configuration and control.
