參數(shù)資料
型號(hào)： AD8349AREZ-RL7
廠商： ANALOG DEVICES INC
元件分類： 調(diào)制器/解調(diào)器
英文描述： 700 MHz - 2700 MHz RF/MICROWAVE QPSK MODULATOR
封裝： MO-153ABT, TSSOP-16
文件頁(yè)數(shù)： 7/28頁(yè)
文件大?。?/td> 729K
代理商： AD8349AREZ-RL7
AD8349
Rev. A | Page 15 of 28
BASIC CONNECTIONS
The basic connections for operating the AD8349 are shown in
Figure 43. A single power supply of between 4.75 V and 5.5 V is
applied to pins VPS1 and VPS2. A pair of ESD protection diodes
connect internally between VPS1 and VPS2, so these must be
tied to the same potential. Both pins should be individually
decoupled using 100 pF and 0.1 μF capacitors to ground. These
capacitors should be located as close as possible to the device.
For normal operation, the output enable pin, ENOP, must be
pulled high. The turn-on threshold for ENOP is 2 V. Pins
COM1, COM2, and COM3 should all be tied to the same
ground plane through low impedance paths.
BASEBAND I AND Q INPUTS
The I and Q inputs should be driven differentially. The typical
differential drive level (as used for characterization measure-
ments) for the I and Q baseband signals is 1.2 V p-p, which is
equivalent to 600 mV p-p on each baseband input. The base-
band inputs have to be externally biased to a level between
400 mV and 500 mV. The optimum level for the best perfor-
mance is 400 mV. The recommended drive level of 1.2 V p-p
does not indicate a maximum drive level. If operation closer to
compression is desired, the 1.2 V p-p differential limit can be
exceeded.
For baseband signals with a high peak-to-average ratio (e.g.,
CDDA or WCDMA), the peak signal level will have to be below
the AD8349’s compression level in order to prevent clipping of
the signal peaks. Clipping of signal peaks increases distortion.
In the case of CDMA and WCDMA inputs, clipping results in
an increase of signal leakage into adjacent channels. In general,
the baseband drive should be at a level where the peak signal
power of the output signal is at least a crest factor below the
AD8349’s output compression point. Refer to the Applications
section for drive-level considerations in WCDMA and
GSM/EDGE systems.
Reducing the baseband drive level also has the benefit of
increasing the bandwidth of the baseband input. This would
allow the AD8349 to be used in applications requiring a high
modulation bandwidth, e.g., as the IF modulator in high data-
rate microwave radios.
SINGLE-ENDED BASEBAND DRIVE
Where only single-ended I and Q signals are available, a
differential amplifier, such as the AD8132 or AD8138, can be
used to generate the required differential drive signal for the
AD8349.
Figure 44 shows an example of a circuit that converts a ground-
referenced, single-ended signal to a differential signal, and adds
the required 400 mV bias voltage.
The baseband inputs can also be driven with a single-ended
signal biased to 400 mV, with the unused inputs biased to
400 mV dc. This mode of operation is not recommended,
however, because any dc level difference between the bias level
of the drive signal and the dc level on the unused input
(including the effect of temperature drift), can result in
increased LO feedthrough. Additionally, the maximum low
distortion output power will be reduced by 6 dB.
IBBP
IBBN
COM1
LOIN
QBBP
QBBN
COM3
VPS2
LOIP
VPS1
ENOP
VOUT
COM3
COM2
03570-0-044
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
AD8349
T1
ETC1-1-13
1
5
3
2
4
100pF
0.1
F
100pF
QP
QN
+VS
VOUT
100pF
+VS
LO
IN
IP
0.1
F
100pF
200
200
Figure 43. Basic Connections
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