Overview
The AD9856ASTZ from Analog Devices Inc. is a highly integrated CMOS 200 MHz Quadrature Digital Upconverter. This device combines a high-speed direct digital synthesizer (DDS), a 12-bit digital-to-analog converter (DAC), clock multiplier circuitry, and various digital filters to form a complete quadrature digital upconverter. It is designed to serve as a universal I/Q modulator and agile upconverter, particularly in communications applications where factors such as cost, size, power dissipation, and dynamic performance are critical.
Key Specifications
| Parameter | Description |
|---|---|
| DAC Resolution | 12-bit |
| Maximum Output Frequency | Up to 200 MHz |
| 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 |
| Package Type | 48-LQFP (7x7) |
| SFDR (Spurious-Free Dynamic Range) | >52 dB @ 40 MHz AOUT, >48 dB @ 70 MHz AOUT, >80 dB narrow-band @ 70 MHz AOUT |
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
- Bidirectional control bus interface
- Supports burst and continuous Tx modes
- Single-tone mode for frequency synthesis applications
- Four programmable, pin-selectable modulator profiles
- Direct interface to AD8320/AD8321 PGA cable driver
- Full sleep mode with power dissipation reduced to less than 6 mW
- I/Q channel invert and spectral phase inversion enable
Applications
- HFC data, telephony, and video modems
- Wireless and satellite communications
- Cellular base stations
Q & A
- What is the maximum output frequency of the AD9856ASTZ?
The maximum output frequency of the AD9856ASTZ is up to 200 MHz.
- What is the resolution of the DAC in the AD9856ASTZ?
The DAC resolution is 12-bit.
- What is the operating temperature range of the AD9856ASTZ?
The operating temperature range is −40°C to +85°C.
- What types of modulation modes does the AD9856ASTZ support?
The AD9856ASTZ supports burst and continuous Tx modes, as well as single-tone mode for frequency synthesis applications.
- How many programmable modulator profiles does the AD9856ASTZ have?
The AD9856ASTZ has four programmable, pin-selectable modulator profiles.
- What is the power dissipation in full sleep mode?
In full sleep mode, the power dissipation is reduced to less than 6 mW.
- What is the SFDR of the AD9856ASTZ at different frequencies?
The SFDR is >52 dB @ 40 MHz AOUT, >48 dB @ 70 MHz AOUT, and >80 dB narrow-band @ 70 MHz AOUT.
- What is the package type of the AD9856ASTZ?
The package type is 48-LQFP (7x7).
- Does the AD9856ASTZ support I/Q channel inversion?
- What is the supply voltage requirement for the AD9856ASTZ?
The supply voltage requirement is +3 V single-supply operation.
