Overview
The AD9856AST from Analog Devices Inc. is a highly integrated, high-performance quadrature digital upconverter designed for various communication applications. This device combines a direct digital synthesizer (DDS), a 12-bit digital-to-analog converter (DAC), and other digital signal processing (DSP) functions on a single chip. It is optimized for applications where cost, size, power dissipation, and dynamic performance are critical. The AD9856AST operates over an extended industrial temperature range of −40°C to +85°C and is available in a space-saving 48-pin LQFP (7x7) surface-mount package.
Key Specifications
| Attribute | Description |
|---|---|
| Manufacturer | Analog Devices Inc. |
| Package / Case | 48-LQFP (7x7) |
| Mounting Type | Surface Mount |
| Function | Upconverter |
| Frequency Range | 5 MHz ~ 200 MHz |
| DAC Resolution | 12-bit |
| Input Sample Rate | Up to 50 Msamples/sec @ 200 MHz SYSCLK rate |
| Reference Clock Frequency | 10 MHz to 50 MHz (with REFCLK multiplier enabled), 200 MHz (with REFCLK multiplier disabled) |
| Supply Voltage | +3 V single-supply operation |
| Operating Temperature | −40°C to +85°C |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
Key Features
- Integrated 12-bit DAC and high-speed DDS
- Programmable sample rate interpolation filter and reference clock multiplier
- Internal SIN(x)/x compensation filter
- High SFDR: >52 dB @ 40 MHz AOUT, >48 dB @ 70 MHz AOUT, >80 dB narrow-band SFDR @ 70 MHz AOUT
- Bidirectional control bus interface
- Supports burst and continuous Tx modes
- Single-tone mode for frequency synthesis applications
- Four programmable, pin-selectable modulator profiles
- Full sleep mode with power dissipation reduced to less than 6 mW
- I/Q channel invert configurable via control bus
Applications
- HFC data, telephony, and video modems
- Wireless and satellite communications
- Cellular base stations
Q & A
- What is the primary function of the AD9856AST?
The AD9856AST is a quadrature digital upconverter, integrating a DDS, a 12-bit DAC, and other DSP functions for communication applications.
- What is the operating frequency range of the AD9856AST?
The AD9856AST operates within a frequency range of 5 MHz to 200 MHz.
- What is the resolution of the DAC in the AD9856AST?
The DAC in the AD9856AST has a resolution of 12 bits.
- What is the maximum input sample rate of the AD9856AST?
The maximum input sample rate is up to 50 Msamples/sec at a 200 MHz SYSCLK rate.
- What are the power supply requirements for the AD9856AST?
The AD9856AST operates on a +3 V single-supply voltage.
- What is the operating temperature range of the AD9856AST?
The operating temperature range is −40°C to +85°C.
- Does the AD9856AST support different modulation profiles?
Yes, it supports four programmable, pin-selectable modulator profiles.
- How does the AD9856AST manage power consumption in sleep mode?
In full sleep mode, the power dissipation is reduced to less than 6 mW.
- What types of communication applications is the AD9856AST suitable for?
The AD9856AST is suitable for HFC data, telephony, and video modems, wireless and satellite communications, and cellular base stations.
- What is the package type and size of the AD9856AST?
The AD9856AST is available in a 48-pin LQFP (7x7) surface-mount package.
- Can the I/Q channel invert be configured on the AD9856AST?
Yes, the I/Q channel invert can be configured via the control bus.
