ADI AD9273BSVZ-50

The AD9273 is designed for low cost, low power, small size, and ease of use. It contains eight channels of a low noise preamplifier (LNA) with a variable gain amplifier (VGA); an antialiasing filter (AAF); and a 12-bit, 10 MSPS to 50 MSPS analog-to-digital converter (ADC).

Each channel features a variable gain range of 42 dB, a fully differential signal path, an active input preamplifier termination, a maximum gain of up to 52 dB, and an ADC with a conversion rate of up to 50 MSPS. The channel is optimized for dynamic performance and low power in applications where a small package size is critical.

The LNA has a single-ended-to-differential gain that is selectable through the SPI. The LNA input-referred noise voltage is typically 1.26 nV/√Hz at a gain of 21.3 dB, and the combined input-referred noise voltage of the entire channel is 1.42 nV/√Hz at typical gain. Assuming a 15 MHz noise bandwidth (NBW) and a 21.3 dB LNA gain, the input SNR is about 91 dB. In CW Doppler mode, the LNA output drives a transconductance amp that is switched through an 8×8 differential crosspoint switch. The switch is programmable through the SPI.

• 8 channels of LNA, VGA, AAF, and ADC
• Low noise preamplifier (LNA) Input-referred noise voltage δ = 1.26 nV/√Hz (gain = 27.3 dB) @5 MHz typical
• SPI-programmable gain = 75.6 dB/17.9 dB/21.3 dB
• Single-ended input; yIN maximum = 733 mV p-p/550 mV p-p/367 mV p-p
• Dual-mode active input impedance matching
• Bandwidth (BW) > 100 MHz
• Full-scale (FS) output = ±4.4 p-p differential
• Variable gain amplifier (VGA) Attenuator range = -4z dB to 0 dB
• SPI-programmable PGA gain = 27 dB/24 dB/27 dB/30 dB
• Linear-in-dB gain control
• Antialiasing filter (AAF) Programmable 2nd-order low-pass filter (LPF) from 8 MHz to 18 MHz
• Programmable high-pass filter (HPF)
• Analog-to-digital converter (ADC) 12 bits at 10 MSPS to 50 MSPS
• SNR = 70 dB
• SFDR = 75 dB
• Serial LVDS (ANSI-644, IEEE 1596.3 reduced range link) Data and frame clock outputs
• Includes an 8×8 differential crosspoint switch to support continuous wave (CW) Doppler
• Low power, 109 mW per channel at 12 bits/40 MSPS (TGC)
• 70 mW per channel in CW Doppler
• Flexible power-down modes
• Overload recovery in < 10 ns
• Fast recovery from low power standby mode, < 2 μs
• 100-lead TQFP and 144-ball BGA

• Medical imaging/ultrasound
• Automotive radar