1 Features

1• 12-Bit Resolution, Dual-Channel, 1-GSPS ADC

• Noise Floor: –157 dBFS/Hz

• Spectral Performance (fIN = 170 MHz at –1 dBFS):

– SNR: 67.8 dBFS

– NSD: –155 dBFS/Hz

– SFDR: 86 dBc (Including Interleaving Tones)

– SFDR: 89 dBc (Except HD2, HD3, and

Interleaving Tones)

• Spectral Performance (fIN = 350 MHz at –1 dBFS):

– SNR: 65.6 dBFS

– NSD: –152.6 dBFS/Hz

– SFDR: 75 dBc

– SFDR: 85 dBc (Except HD2, HD3, and

Interleaving Tones)

• Channel Isolation: 100 dBc at fIN = 170 MHz

• Input Full-Scale: 1.9 VPP

• Input Bandwidth (3 dB): 1.2 GHz

• On-Chip Dither

• Integrated Wideband DDC Block

• JESD204B Interface with Subclass 1 Support:

– 2 Lanes per ADC at 10.0 Gbps

– 4 Lanes per ADC at 5.0 Gbps

– Support for Multi-Chip Synchronization

• Power Dissipation: 1.35 W/Ch at 1 GSPS

• Package: 72-Pin VQFNP (10 mm × 10 mm)

2 Applications

• Radar and Antenna Arrays

• Broadband Wireless

• Cable CMTS, DOCSIS 3.1 Receivers

• Communications Test Equipment

• Microwave Receivers

• Software Defined Radios (SDRs)

• Digitizers

• Medical Imaging and Diagnostics

3 Description

The ADS54J20 is a low-power, wide-bandwidth, 12-

bit, 1.0-GSPS, dual-channel, analog-to-digital

converter (ADC). Designed for high signal-to-noise

ratio (SNR), the device delivers a noise floor of

–157 dBFS/Hz for applications aiming for highest

dynamic range over a wide instantaneous bandwidth.

The device supports the JESD204B serial interface

with data rates up to 10 Gbps, supporting two or four

lanes per ADC. The buffered analog input provides

uniform input impedance across a wide frequency

range and minimizes sample-and-hold glitch energy.

Optionally, each ADC channel can be connected to a

wideband digital down-converter (DDC) block. The

ADS54J20 provides excellent spurious-free dynamic

range (SFDR) over a large input frequency range with

very low power consumption.

The JESD204B interface reduces the number of

interface lines, allowing high system integration

density. An internal phase-locked loop (PLL)

multiplies the ADC sampling clock to derive the bit

clock that is used to serialize the 12-bit data from

each channel.