參數(shù)資料
型號(hào): ADF4150BCPZ-RL7
廠商: Analog Devices Inc
文件頁(yè)數(shù): 18/28頁(yè)
文件大?。?/td> 0K
描述: IC PLL FREQ SYNTH 5.0GHZ 24LFCSP
標(biāo)準(zhǔn)包裝: 1,500
類型: 分?jǐn)?shù) N,整數(shù) N,頻率合成器(RF)
PLL:
輸入: CMOS,TTL
輸出: 時(shí)鐘
電路數(shù): 1
比率 - 輸入:輸出: 2:2
差分 - 輸入:輸出: 是/是
頻率 - 最大: 4.4GHz
除法器/乘法器: 是/無(wú)
電源電壓: 3 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 24-WFQFN 裸露焊盤(pán),CSP
供應(yīng)商設(shè)備封裝: 24-LFCSP-WQ(4x4)
包裝: 帶卷 (TR)
Data Sheet
ADF4150
Rev. A | Page 25 of 28
APPLICATIONS INFORMATION
DIRECT CONVERSION MODULATOR
Direct conversion architectures are increasingly being used to
implement base station transmitters. Figure 30 shows how Analog
Devices, Inc., parts can be used to implement such a system.
The circuit block diagram shows the AD9788 TxDAC being
used with the ADL5375. The use of dual integrated DACs, such
as the AD9788 with its specified ±0.02 dB and ±0.004 dB gain
and offset matching characteristics, ensures minimum error
contribution (over temperature) from this portion of the
signal chain.
The local oscillator (LO) is implemented using the ADF4150.
The low-pass filter was designed using ADIsimPLL for a channel
spacing of 200 kHz and a closed-loop bandwidth of 35 kHz.
The LO ports of the ADL5375 can be driven differentially from
the RFOUT+ and RFOUT outputs of the ADF4150. This gives
better performance than a single-ended LO driver and
eliminates the use of a balun to convert from a single-ended LO
input to the more desirable differential LO inputs for the
ADL5375. The typical rms phase noise (100 Hz to 5 MHz) of
the LO in this configuration is 0.61°rms.
The ADL5375 accepts LO drive levels from 10 dBm to 0 dBm.
The optimum LO power can be software programmed on the
ADF4150, which allows levels from 4 dBm to +5 dBm from
each output.
The RF output is designed to drive a 50 load but must be
ac-coupled, as shown in Figure 30. If the I and Q inputs are
driven in quadrature by 2 V p-p signals, the resulting output
power from the modulator is approximately 2 dBm.
Figure 30. Direct Conversion Modulator
AD9788
TxDAC
REFIO
FSADJ
MODULATED
DIGITAL
DATA
QOUTB
IOUTA
IOUTB
QOUTA
2k
LOW-PASS
FILTER
LOW-PASS
FILTER
2700pF
1200pF
39nF
680
360
IBBP
IBBN
QBBP
QBBN
LOIP
LOIN
S
P
I-
CO
M
P
AT
IBL
E
S
E
RI
AL
BUS
ADF4150
CPGND
AGND
SDGND
RFOUT
RFOUT+
1nF
4.7k
RSET
LE
DATA
CLK
REFIN
FREFIN
CP
DVDD AVDD CE
MUXOUT
VCC
VCOOUT
VCO
VTUNE
16
18
AVDD
9
19
1
2
3
24
8
12
13
23
VDD
LOCK
DETECT
51
51
51
51
51
15
14
20
21
LD
7
PDBRF
17
6
22
SDVDD
VP
5
SW
4
ADL5375
RFOUT
QUADRATURE
PHASE
SPLITTER
DSOP
RFIN
RFIN+
11
10
VVCO
3.9nH
1nF
100pF
VVCO
08226-
026
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