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参数资料
| 型号： | AD8349ARE |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 衰减器 |
| 英文描述： | 700 MHz to 2700 MHz Quadrature Modulator |
| 中文描述： | 700 MHz - 2700 MHz RF/MICROWAVE QPSK MODULATOR |
| 封装： | MO-153ABT, TSSOP-16 |
| 文件页数： | 15/28页 |
| 文件大小： | 969K |
| 代理商： | AD8349ARE |
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AD8349
BASIC CONNECTIONS
The basic connections for operating the AD8349 are shown in
Figure 43. A single power supply of between 4.75 V and 5.25 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.
Rev. 0 | Page 15 of 28
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.
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.
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.
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
IBBP
IBBN
COM1
COM1
LOIN
QBBP
QBBN
COM3
COM3
VPS2
LOIP
VPS1
ENOP
VOUT
COM3
COM2
0
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
μ
F
100pF
QP
QN
+V
S
VOUT
100pF
100pF
+V
S
LO
IN
IP
0.1
μ
F
100pF
200
200
Figure 43. AD8349 Basic Connections
相关PDF资料 |
PDF描述 |
|---|---|
| AD8349ARE-REEL7 | 700 MHz to 2700 MHz Quadrature Modulator |
| AD8350 | Low Distortion 1.0 GHz Differential Amplifier |
| AD8350AR15 | Low Distortion 1.0 GHz Differential Amplifier |
| AD8350AR15-EVAL | Low Distortion 1.0 GHz Differential Amplifier |
| AD8350AR15-REEL | Low Distortion 1.0 GHz Differential Amplifier |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8349ARE-REEL7 | 功能描述:IC QUADRATURE MOD 700MHZ 16TSSOP RoHS:否 类别:RF/IF 和 RFID >> RF 调制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:调制器 LO 频率:700MHz ~ 2.3GHz RF 频率:700MHz ~ 2.3GHz P1dB:1dBm 底噪:-148dBm/Hz 输出功率:-1dBm 电流 - 电源:46mA 电源电压:2.7 V ~ 3.6 V 测试频率:1.75GHz 封装/外壳:28-WFQFN 裸露焊盘 包装:带卷 (TR) |
| AD8349AREZ | 功能描述:IC QUADRATURE MOD 700MHZ 16TSSOP RoHS:是 类别:RF/IF 和 RFID >> RF 调制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:调制器 LO 频率:700MHz ~ 2.3GHz RF 频率:700MHz ~ 2.3GHz P1dB:1dBm 底噪:-148dBm/Hz 输出功率:-1dBm 电流 - 电源:46mA 电源电压:2.7 V ~ 3.6 V 测试频率:1.75GHz 封装/外壳:28-WFQFN 裸露焊盘 包装:带卷 (TR) |
| AD8349AREZ-RL7 | 功能描述:IC MOD QUAD 2.7GHZ 16TSSOP RoHS:是 类别:RF/IF 和 RFID >> RF 调制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:调制器 LO 频率:700MHz ~ 2.3GHz RF 频率:700MHz ~ 2.3GHz P1dB:1dBm 底噪:-148dBm/Hz 输出功率:-1dBm 电流 - 电源:46mA 电源电压:2.7 V ~ 3.6 V 测试频率:1.75GHz 封装/外壳:28-WFQFN 裸露焊盘 包装:带卷 (TR) |
| AD8349EVAL | 制造商:Analog Devices 功能描述:IC ((NS)) |
| AD8349-EVAL | 制造商:Analog Devices 功能描述:AD8349 EVALUATION BOARD - Bulk |
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