Overview
The AD9877ABS, produced by Analog Devices Inc., is a single-supply mixed-signal front end (MxFE) designed for set-top box and cable modem applications. This device integrates a comprehensive set of functionalities, including a transmit path with an interpolation filter, a complete quadrature digital upconverter, and transmit DACs. The receive path includes a 12-bit ADC and various auxiliary DACs. The AD9877ABS is optimized for compliance with MCNS-DOCSIS, DVB, and DAVIC standards, offering enhanced receive path undersampling performance and lower cost compared to its predecessors.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 3.3 | V |
| Operating Temperature Range | -40°C to +85°C | °C |
| ADC Resolution (Direct IF ADC) | 12 bits | |
| ADC Sampling Rate (Direct IF ADC) | 33 MSPS | |
| ADC Resolution (IQ ADCs) | 8 bits | |
| ADC Sampling Rate (IQ ADCs) | 16.5 MSPS | |
| Analog Input Voltage Range | 1 Vppd | |
| Input Referred Noise | 600 μV | |
| SINAD (Dynamic Performance) | 40.8 to 47.3 dB | |
| Effective Number of Bits (ENOB) | 6.5 to 7.6 Bits | |
| Package Type | 100-lead MQFP |
Key Features
- Programmable sampling clock rates and selectable interpolation filter
- Analog Tx output level adjustment
- Dual 8-bit, 16.5 MSPS sampling IQ ADCs and a 12-bit, 33 MSPS direct IF ADC
- Two 12-bit Σ-Δ auxiliary DACs
- Direct interface to AD8321/AD8325 or AD8322/AD8327 PGA cable drivers via the MxFE SPORT
- CA port for host processor control of PGA cable drivers
- Enhanced receive path undersampling performance and lower cost compared to the AD9873
Applications
- Cable modems
- Set-top boxes
- Wireless modems
Q & A
- What is the primary application of the AD9877ABS?
The AD9877ABS is primarily used in set-top boxes and cable modems.
- What are the key components of the AD9877ABS?
The device includes a transmit path with an interpolation filter, a complete quadrature digital upconverter, transmit DACs, a 12-bit ADC, and auxiliary DACs.
- What are the operating voltage and temperature range of the AD9877ABS?
The operating voltage is 3.3V, and the temperature range is -40°C to +85°C.
- What is the resolution and sampling rate of the direct IF ADC?
The direct IF ADC has a resolution of 12 bits and a sampling rate of 33 MSPS.
- Can the AD9877ABS be controlled by a host processor?
- What is the package type of the AD9877ABS?
The AD9877ABS is available in a 100-lead MQFP package.
- What standards is the AD9877ABS compliant with?
The AD9877ABS is compliant with MCNS-DOCSIS, DVB, and DAVIC standards.
- What are the key advantages of the AD9877ABS over its predecessors?
The AD9877ABS offers enhanced receive path undersampling performance and lower cost compared to the AD9873.
- What is the input referred noise of the ADCs in the AD9877ABS?
The input referred noise is 600 μV.
- What is the SINAD and ENOB of the ADCs in the AD9877ABS?
The SINAD is 40.8 to 47.3 dB, and the ENOB is 6.5 to 7.6 bits.
