Overview
The AD6655ABCPZ-125, produced by Analog Devices Inc., is a mixed-signal intermediate frequency (IF) receiver designed for communications applications where low cost, small size, and versatility are crucial. This device features dual 14-bit analog-to-digital converters (ADCs) with sample rates of up to 125 MSPS, along with a wideband digital downconverter (DDC). The ADCs have a multistage, differential pipelined architecture with integrated output error correction logic, ensuring high accuracy and performance. The integrated voltage reference and duty cycle stabilizer further enhance the device's reliability and stability.
Key Specifications
| Parameter | AD6655-125 | Unit |
|---|---|---|
| Resolution | 14 | Bits |
| Sample Rate | Up to 125 | MSPS |
| Offset Error | ±0.2 to ±0.6 | % FSR |
| Gain Error | −3.6 to −0.1 | % FSR |
| Temperature Drift (Offset Error) | ±15 | ppm/°C |
| Temperature Drift (Gain Error) | ±95 | ppm/°C |
| Internal Voltage Reference Output Voltage Error (1 V Mode) | ±5 to ±18 | mV |
| Input-Referred Noise (VREF = 1.0 V, 25°C) | 0.85 | LSB rms |
| Differential Clock Inputs Logic Compliance | CMOS/LVDS/LVPECL | |
| Differential Input Voltage Range | 0.2 to 6 | V p-p |
Key Features
- Dual 14-bit ADCs with sample rates of up to 125 MSPS.
- Wideband digital downconverter (DDC) with four cascaded signal processing stages: a 32-bit frequency translator (NCO), a half-band decimating filter, a fixed FIR filter, and an fADC/8 fixed-frequency NCO.
- Integrated voltage reference and duty cycle stabilizer for improved performance and stability.
- Fast detect feature for fast overrange detection and programmable threshold detector for monitoring incoming signal power.
- Signal monitor block to aid in setting the gain to optimize the dynamic range of the overall system.
- SYNC input for synchronization of multiple devices and a 3-bit SPI port for register programming and readback.
Applications
The AD6655ABCPZ-125 is designed for various communications applications, including CDMA, EDGE, and GSM. It is particularly suited for systems requiring low cost, small size, and high versatility. Other potential applications include wireless infrastructure, radar systems, and any scenario where high-speed ADCs and digital downconversion are necessary.
Q & A
- What is the sample rate of the AD6655ABCPZ-125?
The AD6655ABCPZ-125 has a sample rate of up to 125 MSPS. - What type of ADC architecture does the AD6655ABCPZ-125 use?
The device uses a multistage, differential pipelined architecture with integrated output error correction logic. - Does the AD6655ABCPZ-125 have an integrated voltage reference?
Yes, it has an integrated voltage reference to ease design considerations. - What is the purpose of the fast detect feature in the AD6655ABCPZ-125?
The fast detect feature allows for fast overrange detection by outputting four bits of input level information with short latency. - How does the AD6655ABCPZ-125 support automatic gain control (AGC)?
The device supports AGC through its fast detect feature, programmable threshold detector, and signal monitor block. - What types of clock inputs does the AD6655ABCPZ-125 support?
The device supports CMOS, LVDS, and LVPECL clock inputs. - Can the AD6655ABCPZ-125 be synchronized with other devices?
Yes, it has a SYNC input for synchronization of multiple devices. - What is the logic compliance of the differential clock inputs?
The differential clock inputs comply with CMOS, LVDS, and LVPECL logic standards. - What are the typical applications of the AD6655ABCPZ-125?
The device is typically used in CDMA, EDGE, GSM, wireless infrastructure, and radar systems. - How does the AD6655ABCPZ-125 aid in optimizing the dynamic range of the system?
The signal monitor block allows the user to monitor the composite magnitude of the incoming signal, aiding in setting the gain to optimize the dynamic range.
