a
FEATURES
IF Sampling up to 350 MHz
SNR = 67.5 dB, fIN up to Nyquist @ 105 MSPS
SFDR = 83 dBc, fIN 70 MHz @ 105 MSPS
SFDR = 72 dBc, f IN 150 MHz @ 105 MSPS
2 V p-p Analog Input Range Option
On-Chip Clock Duty Cycle Stabilization
On-Chip Reference and Track/Hold
SFDR Optimization Circuit
Excellent Linearity:
DNL = ؎0.25 LSB (Typ)
INL = ؎0.5 LSB (Typ)
750 MHz Full Power Analog Bandwidth
Power Dissipation = 1.35 W Typical @ 125 MSPS
Two’s Complement or Offset Binary Data Format
5.0 V Analog Supply Operation
2.5 V to 3.3 V TTL/CMOS Outputs
APPLICATIONS
Cellular Infrastructure Communication Systems
3G Single and Multicarrier Receivers
IF Sampling Schemes
Wideband Carrier Frequency Systems
Point to Point Radios
LMDS, Wireless Broadband
MMDS Base Station Units
Cable Reverse Path
Communications Test Equipment
Radar and Satellite Ground Systems
GENERAL INTRODUCTION
The AD9433 is a 12-bit monolithic sampling analog-to-digital
converter with an on-chip track-and-hold circuit and is designed
for ease of use. The product operates up to 125 MSPS conversion rate and is optimized for outstanding dynamic performance
in wideband and high IF carrier systems.
The ADC requires a 5 V analog power supply and a differential
encode clock for full performance operation. No external reference or driver components are required for many applications.
The digital outputs are TTL/CMOS compatible and a separate
output power supply pin supports interfacing with 3.3 V or
2.5 V logic.
A user-selectable, on-chip proprietary circuit optimizes spuriousfree dynamic range (SFDR) versus signal-to-noise-and-distortion
(SINAD) ratio performance for different input signal frequencies,
providing as much as 83 dBc SFDR performance over the dc
to 70 MHz band.
12-Bit, 105 MSPS/125 MSPS
IF Sampling A/D Converter
AD9433
FUNCTIONAL BLOCK DIAGRAM
AD9433
VCC
AIN
AIN
ENCODE
ENCODE
PIPELINE
ADC
T/H
12
VDD
OUTPUT
STAGING
D11–D0
12
DFS
ENCODE
TIMING
GND
REF
SFDR
REF REF
OUT IN
The encode clock supports either differential or single-ended
input and is PECL-compatible. The output format is userselectable for binary or two’s complement and provides an
overrange (OR) signal.
Fabricated on an advanced BiCMOS process, the AD9433 is
available in a thermally enhanced 52-lead plastic quad flatpack
specified over the industrial temperature range (–40°C to
+85°C) and is pin-compatible with the AD9432.
PRODUCT HIGHLIGHTS
1. IF Sampling
The AD9433 maintains outstanding ac performance up to
input frequencies of 350 MHz. Suitable for 3G Wideband
Cellular IF sampling receivers.
2. Pin-Compatibility
This ADC has the same footprint and pin layout as the
AD9432, 12-Bit 80/105 MSPS ADC.
3. SFDR Performance
A user-selectable on-chip circuit optimizes SFDR performance
as much at 85 dBc from dc to 70 MHz.
4. Sampling Rate
At 125 MSPS, this ADC is ideally suited for current wireless
and wired broadband applications such as LMDS/MMDS
and cable reverse path.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
