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ADC12Dxx00RF Direct RF-Sampling ADCs Sample Beyond 2.7 GHz at up to 3.6 GSPS
Breakthrough RF-Sampling ADCs Revolutionize Radio
Architectures
National's 12-bit direct RF-sampling ADCs can directly
sample input frequencies up to and beyond 2.7 GHz at up to
3.6 GSPS. A single direct RF-sampling ADC can replace an
entire IF-sampling or ZIF-sampling radio signal path
subsystem of mixers, LO synthesizers, amplifiers, filters, and
ADCs, drastically reducing bill of materials (BOM) cost,
design time, and board size, weight, and power. A wide
array of applications such as 3G/4G wireless basestations,
microwave backhaul, military, and wideband software-
defined radio (SDR) can now achieve the benefits that RF-
sampling provides.
The ADC12Dxx00RF family of ADCs improves upon
National's existing 12-bit GSPS ADC products by expanding
the frequency range over which National's superior dynamic
range can be realized. The ADC12Dxx00RF delivers its
excellent noise and linearity performance at RF frequencies
beyond the 7th Nyquist zone. These five new ADCs are
available in speed grades ranging fr om dual-channel 500
MSPS to single-channel 3.6 GSPS. They are pin-compatible
with National's ADC12D1x00 and ADC10D1x00 families,
enabling system designers to reuse a single design for
multiple speed and resolution combinations.
RF Sampling A/D Converters
Product ID Sampling Rate Sing le/Dual-Channel (MSPS) Power (W) IMD3 @ 2.7 GHz (dBFS) Noise Floor (dBm/Hz)
ADC12D500RF 1000 / 500 2 -69 -150.5
ADC12D800RF 1600 / 800 2.5 -71 -152.2
ADC12D1000RF 2000 / 1000 3.5 -69 -154
ADC12D1600RF 3200 / 1600 4 -70 -154.6
ADC12D1800RF 3600 / 1800 4.4 -64 -155
Direct RF-Sampling ADCs
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Unparalleled Performance
Industry's best dynamic performance at 2.7 GHz and
beyond
Footprint-compatible family from 500 MSPS to 3.6 GSPS
Reduce design time and cost and make future
upgrades easy by reusing designs at different speed
grades
Footprint-compatible with National's ADC12D1x00 and
ADC10D1x00
Enable design reuse for different dynamic range
requirements
Industry's largest Nyquist zone of up to 1.8 GHz
Enable truly wideband software-defined radio (SDR)
Combine multiple wideband and narrowband
channels into a single ultra wideband channel
New interleaved mode more than doubles useable input
frequency range
Sample higher input frequencies w ith higher
resolution than previously possible
RF-Sampling A/D Applicatio ns
The RF-sampling ADC family replaces multiple analog components with a single chip, reducing system cost, size, weight, and power, and saving design time. In addition, their excellent
performance over a large range of input frequencies up to and beyond 2.7 GHz enables maximum frequency, bandwidth, and overall system programmability and flexibility in many
applications including software-defined radio (SDR) and dig ital pre-distortion (DPD) in LTE/UMTS basestations, radar, lidar, and signal intelligence (SIGINT).
Basestations
Allows direct RF-sampling in 3G/4G receive and dig ital pre-
distortion (DPD) signal paths
Replace entire IF-sampling and ZIF-sampling subsystems of
mixers, LO-synthesizers, amplifiers, filters, and ADCs
1.8 GHz Nyquist zone enables ultra-wideband and multiband
radio designs
Microwave Backhaul
Enable higher data capacity backhaul link – industry's largest
Nyquist zone and best performance beyond 2.7 GHz allows for
higher-order modulation over channel bandwidths of at least 1.25
GHz
RF-sampling capability enables ODU and IDU integration by
eliminating entire IF-sampling and ZIF-sampling subsystems
RF-sampling capability eliminates multiple frequency down-
conversion stages
Software-Defined Radi o and Military
Replace multiple frequency down-conversion stages and combine
multiple narrowband and wideband channels into a single ultra
wideband channel
Excellent noise and linearity performance beyond 2.7 GHz and
industry's largest Nyquist zone enable digital implementation of
filters and mixers, allowing for on-the-fly programming of
bandwidth and frequency to maximize system agility and flexibility
Test & Measurement
Enable higher bandwidth scopes and higher resolution, larger
bandwidth real-time spectrum analyzers (RTSA)
Enable higher linearity analyzers
RF Sampling ADC Resources
Software Defined Radio: Don't Talk to Me About ENOBs (article)
Software-Defined Radio (SDR) Information
WaveVision 5 Software: Data Acquisition & Analysis Tool
Gigasample ADC Eval Boards
IBIS Models
Related Products
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Wireless Infrastructure Solutions
Copyright © 2011 National Semiconductor Corporation
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Pa
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