14-Bit, 105/125 MSPS, IF Sampling ADC
AD9445
FEATURES
125 MSPS guaranteed sampling rate (AD9445BSV-125)
78.3 dBFS SNR/92 dBFS SFDR with 30 MHz input (3.2 V p-p)
74.8 dBFS SNR/95 dBFS SFDR with 30 MHz input (2.0 V p-p)
77.0 dBFS SNR/87 dBFS SFDR with 170 MHz input (3.2 V p-p)
74.6 dBFS SNR/95 dBFS SFDR with 170 MHz input (2.0 V p-p)
73.0 dBFS SNR/88 dBFS SFDR with 300 MHz input (2.0 V p-p)
102 dBFS 2-tone SFDR with 30 MHz and 31 MHz
92 dBFS 2-tone SFDR with 170 MHz and 171 MHz
60 fsec rms jitter
Excellent linearity
DNL = ±0.25 LSB typical
INL = ±0.8 LSB typical
2.0 V p-p to 4.0 V p-p differential full-scale input
Buffered analog inputs
LVDS outputs (ANSI-644 compatible) or CMOS outputs
Data format select (offset binary or twos complement)
Output clock available
3.3 V and 5 V supply operation
FUNCTIONAL BLOCK DIAGRAM
AGND AVDD1 AVDD2
DRGND DRVDD
RF ENABLE
DFS
14
CMOS
OR
LVDS
OUTPUT
STAGING
DCS MODE
OUTPUT MODE
OR
D13 TO D0
2
DCO
REF
05489-001
AD9445
BUFFER
VIN+
VIN–
T/H
PIPELINE
ADC
2
28
CLK+
CLK–
CLOCK
AND TIMING
MANAGEMENT
VREF SENSE REFT REFB
Figure 1.
Optional features allow users to implement various selectable
operating conditions, including input range, data format select,
high IF sampling mode, and output data mode.
The AD9445 is available in a Pb-free, 100-lead, surface-mount,
plastic package (100-lead TQFP/EP) specified over the
industrial temperature range −40°C to +85°C.
APPLICATIONS
Multicarrier, multimode cellular receivers
Antenna array positioning
Power amplifier linearization
Broadband wireless
Radar
Infrared imaging
Medical imaging
Communications instrumentation
PRODUCT HIGHLIGHTS
1.
High performance: outstanding SFDR performance for IF
sampling applications such as multicarrier, multimode 3G,
and 4G cellular base station receivers.
Ease of use: on-chip reference and high input impedance
track-and-hold with adjustable analog input range and an
output clock simplifies data capture.
Packaged in a Pb-free, 100-lead TQFP/EP package.
Clock duty cycle stabilizer (DCS) maintains overall ADC
performance over a wide range of clock pulse widths.
OR (out-of-range) outputs indicate when the signal is
beyond the selected input range.
RF enable pin allows users to configure the device for
optimum SFDR when sampling frequencies above 210 MHz
(AD9445-125) or 240 MHz (AD9445-105).
2.
GENERAL DESCRIPTION
The AD9445 is a 14-bit, monolithic, sampling analog-to-digital
converter (ADC) with an on-chip IF sampling track-and-hold
circuit. It is optimized for performance, small size, and ease of
use. The product operates at up to a 125 MSPS conversion rate
and is designed for multicarrier, multimode receivers, such as
those found in cellular infrastructure equipment.
The ADC requires 3.3 V and 5.0 V power supplies and a low
voltage differential input clock for full performance operation.
No external reference or driver components are required for
many applications. Data outputs are CMOS or LVDS
compatible (ANSI-644 compatible) and include the means to
reduce the overall current needed for short trace distances.
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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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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© 2005 Analog Devices, Inc. All rights reserved.
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