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参数资料
| 型号： | AD8339ACPZ-R7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 调制器/解调器 |
| 英文描述： | 0 MHz - 50 MHz RF/MICROWAVE I/Q DEMODULATOR |
| 封装： | 6 X 6 MM, ROHS COMPLIANT, MO-220-VJJD-2, LFCSP-40 |
| 文件页数： | 13/36页 |
| 文件大小： | 2970K |
| 代理商： | AD8339ACPZ-R7 |
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AD8339
Rev. A | Page 20 of
36
To determine the input referred noise, it is important to know
the active low-pass filter (LPF) values RFILT and CFILT, shown in
Figure 53. Typical filter values for a single channel are 1.58 kΩ
for RFILT and 1 nF for CFILT; these values implement a 100 kHz
single-pole LPF. If two channels are summed, as is done on the
AD8339 evaluation board, the resistor value is halved (787 Ω)
and the capacitor value is doubled (2.2 nF), maintaining the
same pole frequency at twice the AD8339 current.
If the RF and LO are offset by 10 kHz, the demodulated signal is
10 kHz and is passed by the LPF. The single-channel mixing gain
from the RF input to the AD8021 output (for example, I1, Q1)
is approximately 1.7× (4.7 dB) for 1.58 kΩ and 1 nF, or 6 dB less
for filter values of 787 Ω and 2.2 nF (0.85× or 1.3 dB). The
noise contributed by the AD8339 is then 11 nV/√Hz × 1.7 or
~18.7 nV/√Hz at the AD8021 output. The combined noise of
the AD8021 and the 1.58 kΩ feedback resistor is 6.3 nV/√Hz, so
the total output referred noise is approximately 19.7 nV/√Hz.
This value can be adjusted by increasing the filter resistor while
maintaining the corner frequency, thereby increasing the gain.
The factor limiting the magnitude of the gain is the output
swing and drive capability of the op amp selected for the I-to-V
converter, in this example, the AD8021.
The limitation on the number of channels summed is the drive
capability of the amplifier, as explained in detail in the Channel
Summing section.
MULTICHANNEL SUMMATION
Analog Beamforming
Beamforming, as applied to medical ultrasound, is defined as
the phase alignment and summation of signals generated from a
common source, but received at different times by a multielement
ultrasound transducer. Beamforming has two functions: it imparts
directivity to the transducer, enhancing its gain, and it defines a
focal point within the body from which the location of the
returning echo is derived. The primary application for the
AD8339 is in analog beamforming circuits for ultrasound.
06
58
7-
0
52
AD8339
AD8332, AD8334 LNA
OR AD8335 PREAMP
TRANSMITTER
TRANSDUCER
CLOCK
DATA
T/R
SW
RFB
2
Φ
I1
Q1
T/R
SW
RFB
2
Φ
I2
Q2
T/R
SW
RFB
2
Φ
I3
Q3
T/R
SW
RFB
2
Φ
I4
Q4
SDI
CONTROLLER
QUADRATURE
DIVIDER
0° 90°
SYSTEM TIMING
CFILT
RFILT
ΣQ
AD7665 OR
AD7686
AD7665 OR
AD7686
16-BIT ADC Q DATA
CFILT
RFILT
ΣI
AD8021
16-BIT ADC I DATA
Figure 53. Interconnection Block Diagram for the AD8339
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8339ACPZ-RL | 功能描述:IC DEMODULATOR I/Q QUAD 40LFCSP RoHS:是 类别:RF/IF 和 RFID >> RF 解调器 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:解调器 LO 频率:- RF 频率:70MHz ~ 300MHz P1dB:-9dBm 增益:- 噪音数据:6.36dB 电流 - 电源:41.5mA 电源电压:2.7 V 封装/外壳:28-WFQFN 裸露焊盘 供应商设备封装:28-TQFN-EP（5x5） 包装:带卷 (TR) |
| AD8339-EVALZ | 功能描述:BOARD EVAL AD8339 I/Q DEMOD RoHS:是 类别:RF/IF 和 RFID >> RF 评估和开发套件，板 系列:- 标准包装:1 系列:- 类型:GPS 接收器 频率:1575MHz 适用于相关产品:- 已供物品:模块 其它名称:SER3796 |
| AD834 | 制造商:AD 制造商全称:Analog Devices 功能描述:500 MHz Four-Quadrant Multiplier |
| AD834_12 | 制造商:AD 制造商全称:Analog Devices 功能描述:500 MHz Four-Quadrant Multiplier |
| AD8340 | 制造商:AD 制造商全称:Analog Devices 功能描述:400 MHz to 6 GHz Broadband Quadrature Modulator |
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