AD6643-250EBZ high-performance analog-to-digital converters
The AD6643 is an 11-bit, 250 MSPS, dual-channel intermediate frequency (IF) receiver designed to support multi-antenna systems in telecom applications requiring high dynamic range performance, low power consumption, and small form factor.
The device includes two high-performance analog-to-digital converters (ADCs) and noise shaping requantizer (NSR) digital modules. Each ADC adopts a multi-level, differential pipeline architecture and integrates output error correction logic. The first stage of the ADC differential pipeline contains a wide bandwidth switching capacitor sampling network. Integrated voltage reference simplifies design. The duty cycle stabilizer (DCS) compensates for fluctuations in the ADC clock duty cycle, allowing the converter to maintain excellent performance.
The outputs of each ADC are internally connected to the NSR module. Integrated NSR circuitry improves signal-to-noise ratio (SNR) performance in smaller frequency bands within Nyquist's bandwidth. The device supports two different output modes, which can be selected via an external MODE pin or SPI. Applications - Communications
- Diversity radio and intelligent antenna (MIMO) systems
- Multi-mode digital receiver (3G)
WCDMA, LTE, CDMA2000
WiMAX, TD-SCDMA
- I/Q demodulation system
- Universal Software Radio
Product features:
1. Small, space-saving 9 mm × 9 mm × 0.85 mm, 64-pin LFCSP package integrates two ADCs.
2. Pin-optional Noise Shaping Requantizer (NSR), which improves the signal-to-noise ratio when the bandwidth is reduced to a maximum of 60 MHz and 185 MSPS.
3. LVDS digital output interface is configured for low-cost FPGA series.
4. Powered by a single 1.8 V power supply.
5. The standard serial port interface (SPI) supports various product features and functions, such as: data formatting (offset binary or binary complement), NSR, shutdown, test mode, and voltage reference mode.