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.