參數(shù)資料
型號(hào)： AD9865
廠商： Analog Devices, Inc.
英文描述： Broadband Modem Mixed-Signal Front End
中文描述： 寬帶調(diào)制解調(diào)器混合信號(hào)前端
文件頁(yè)數(shù)： 36/48頁(yè)
文件大?。?/td> 1672K
代理商： AD9865
AD9865
Rev. A | Page 36 of 48
0
1.0V
TO
ADCs
REFT
REFB
C1
0.1
μ
F
C2
10
μ
F
C3
0.1
μ
F
C4
0.1
μ
F
C1
C4
C2
C3
TOP
VIEW
Figure 75. ADC Reference and Decoupling
The ADC has an internal voltage reference and reference ampli-
fier as shown in Figure 75. The internal band gap reference
generates a stable 1 V reference level that is converted to a dif-
ferential 1 V reference centered about mid-supply (AVDD/2).
The outputs of the differential reference amplifier are available
at the REFT and REFB pins and
must
be properly decoupled for
optimum performance. The REFT and REFB pins are conven-
iently situated at the corners of the CSP package such that C1
(0603 type) can be placed directly across its pins. C3 and C4 can
be placed underneath C1, and C2 (10 μF tantalum) can be
placed furthest from the package.
Table 21. SPI Registers for Rx ADC
Address (Hex)
0x04
0x07
0x13
Bit
(5)
(4)
(4)
(2:0)
Description
Duty cycle restore circuit
ADC clock from PLL
ADC low power mode
ADC power bias adjust
AGC TIMING CONSIDERATIONS
When implementing a digital AGC timing loop, it is important
to consider the Rx path latency and settling time of the Rx path
in response to a change in gain setting. Figure 21 and Figure 24
show the RxPGA’s settling response to a 60 dB and 5 dB change
in gain setting when using the Tx[5:0] or PGA[5:0] port. While
the RxPGA settling time may also show a slight dependency on
the LPF’s cut-off frequency, the ADC’s pipeline delay along with
the ADIO bus interface presents a more significant delay. The
amount of delay or latency is dependent on whether a half-or
full-duplex is selected. An impulse response at the RxPGA’s
input can be observed after 10.0 ADC clock cycles (1/f
ADC
) in
the case of a half-duplex interface, and 10.5 ADC clock cycles in
the case of a full-duplex interface. This latency, along with the
RxPGA settling time, should be considered to ensure stability of
the AGC loop.
相關(guān)PDF資料
PDF描述
AD9865-EB Broadband Modem Mixed-Signal Front End
AD9865BCP Broadband Modem Mixed-Signal Front End
AD9865BCPRL Broadband Modem Mixed-Signal Front End
AD9865BCPZ1 Broadband Modem Mixed-Signal Front End
AD9865BCPZRL1 Broadband Modem Mixed-Signal Front End
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD9865BCP 制造商:Analog Devices 功能描述:Mixed Signal Front End 64-Pin LFCSP EP 制造商:Analog Devices 功能描述:MIXED SGNL FRONT END 64LFCSP EP - Trays 制造商:Analog Devices 功能描述:10BIT MIXED SIGNAL CONVERTER 9865
AD9865BCPRL 制造商:Analog Devices 功能描述:Mixed Signal Front End 64-Pin LFCSP EP T/R
AD9865BCPZ 功能描述:IC PROCESSOR FRONT END 64LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 前端 (LNA + PA) 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:250 系列:- RF 型:GPS 頻率:1575.42MHz 特點(diǎn):- 封裝/外殼:48-TQFP 裸露焊盤 供應(yīng)商設(shè)備封裝:48-TQFP 裸露焊盤（7x7） 包裝:托盤
AD9865BCPZ1 制造商:AD 制造商全稱:Analog Devices 功能描述:Broadband Modem Mixed-Signal Front End
AD9865BCPZRL 功能描述:IC PROCESSOR FRONT END 64LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 前端 (LNA + PA) 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:250 系列:- RF 型:GPS 頻率:1575.42MHz 特點(diǎn):- 封裝/外殼:48-TQFP 裸露焊盤 供應(yīng)商設(shè)備封裝:48-TQFP 裸露焊盤（7x7） 包裝:托盤
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