参数资料
| 型号： | AD8348-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD8348 |
| 设计资源： | AD8348 Gerber Files |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | Q6082516 |
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50 MHz to 1000 MHz
Quadrature Demodulator
AD8348
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Integrated I/Q demodulator with IF VGA amplifier
VREF
14
IMXO
8
IOFS
13
IAIN
6
IOPP
4
IOPN
3
Operating IF frequency 50 MHz to 1000 MHz
(3 dB IF BW of 500 MHz driven from R S = 200 Ω)
ENBL 15
BIAS
CELL
VREF
5
VCMO
Demodulation bandwidth 75 MHz
VCMO
Linear-in-decibel AGC range 44 dB
IFIP 11
DIVIDE
BY 2
1
LOIP
Third-order intercept
IIP3 +28 dBm @ minimum gain (F IF = 380 MHz)
IIP3 ?8 dBm @ maximum gain (F IF = 380 MHz)
Quadrature demodulation accuracy
IFIN 10
VGIN 17
GAIN
CONTROL
PHASE
SPLITTER
VCMO
AD8348
28
LOIN
Phase accuracy 0.5°
18
19
24
21
16
23
25
26
Amplitude balance 0.25 dB
MXIP MXIN ENVG
QXMO
QOFS
QAIN
QOPP QOPN
Noise figure 11 dB @ maximum gain (F IF = 380 MHz)
LO input ?10 dBm
Single supply 2.7 V to 5.5 V
Power-down mode
Compact, 28-lead TSSOP package
APPLICATIONS
QAM/QPSK demodulator
W-CDMA/CDMA/GSM/NADC
Wireless local loop
LMDS
GENERAL DESCRIPTION
The AD8348 is a broadband quadrature demodulator with an
integrated intermediate frequency (IF), variable gain amplifier
(VGA), and integrated baseband amplifiers. It is suitable for use in
communications receivers, performing quadrature demodulation
from IF directly to baseband frequencies. The baseband amplifiers
are designed to interface directly with dual-channel ADCs, such
as the AD9201 , AD9283 , and AD9218 , for digitizing and post-
processing.
The IF input signal is fed into two Gilbert cell mixers through
an X-AMP? VGA. The IF VGA provides 44 dB of gain control.
A precision gain control circuit sets a linear-in-decibel gain char-
acteristic for the VGA and provides temperature compensation.
The LO quadrature phase splitter employs a divide-by-2 frequency
divider to achieve high quadrature accuracy and amplitude balance
over the entire operating frequency range.
Optionally, the IF VGA can be disabled and bypassed. In this
mode, the IF signal is applied directly to the quadrature mixer
inputs via the MXIP and MXIN pins.
Rev. A
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.
Trademarks and registered trademarks are the property of their respective owners.
Figure 1.
Separate I- and Q-channel baseband amplifiers follow the baseband
outputs of the mixers. The voltage applied to the VCMO pin sets
the dc common-mode voltage level at the baseband outputs.
Typically, VCMO is connected to the internal VREF voltage, but
it can also be connected to an external voltage. This flexibility
allows the user to maximize the input dynamic range to the ADC.
Connecting a bypass capacitor at each offset compensation input
(IOFS and QOFS) nulls dc offsets produced in the mixer. Offset
compensation can be overridden by applying an external voltage
at the offset compensation inputs.
The mixers’ outputs are brought off-chip for optional filtering
before final amplification. Inserting a channel selection filter
before each baseband amplifier increases the baseband amplifiers’
signal handling range by reducing the amplitude of high level,
out-of-channel interferers before the baseband signal is fed into
the I/Q baseband amplifiers. The single-ended mixer output is
amplified and converted to a differential signal for driving ADCs.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ?2006 Analog Devices, Inc. All rights reserved.
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