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參數(shù)資料
| 型號(hào)： | AD608 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Power Mixer/Limiter/RSSI 3 V Receiver IF Subsystem(低功耗混合器/Limiter/RSSI 3V接收器IF子系統(tǒng)) |
| 中文描述： | 低功耗混合機(jī)/限制器/ RSSI的3 V接收機(jī)中頻子系統(tǒng)（低功耗混合器/限幅/ RSSI的3V的接收器中頻子系統(tǒng)） |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 201K |
| 代理商： | AD608 |
AD608
REV. B
–9–
RSSI Output
T he logarithmic amplifier uses a successive detection architec-
ture. Each of the five stages has a full-wave detector; two addi-
tional high level detectors are driven through attenuators at the
input to the limiting amplifiers, for a total of seven detector
stages. Because each detector is a full-wave rectifier, the ripple
component in the resulting dc is at twice the IF. T he AD608’s
low-pass filter has a 2 MHz cutoff frequency, which is one
decade below the 21.4 MHz ripple that results from a 10.7 MHz
IF.
For operation at lower IFs such as 450 kHz or 455 kHz, the
AD608 requires an external low-pass filter with a single pole lo-
cated at 90 kHz, a decade below the 900 kHz ripple frequency
for these IFs. T he RSSI range is from the noise level at approxi-
mately –80 dBm to overload at +15 dBm and is specified for
±
1 dB accuracy from –75 dBm to +5 dBm. T he +15 dBm
maximum IF input is provided to accommodate bandpass filters
of lower insertion loss than the nominal 4 dB for 10.7 MHz
ceramic filters.
Digitizing the RSSI
In typical cellular radio applications, the RSSI output of the
AD608 will be digitized by an A/D converter. T he AD608’s
RSSI output is proportional to the power-supply voltage, which
not only allows the A/D converter to use the supply as a refer-
ence but also causes the RSSI output and the A/D converter’s
output to track over power supply variations, reducing system
errors and component costs.
Power Consumption
T he total power-supply current of the AD608 is a nominal
7.3 mA. T he power is signal-dependent, partly as the RSSI
output increases (the current is increased by 200
μ
A at an RSSI
output of +1.8 V) but mostly due to the IF BPF consumption
when being driven to
±
891 mV assuming a 4 dB loss in this
filter and a peak input of +5 dBm to the log-IF amp, and tem-
perature dependent, as the biasing system used in the AD608 is
proportional to absolute temperature (PT AT ).
T roubleshooting
T he most common causes of problems with the AD608 are
incorrect component values for the offset feedback loop, poor
board layout, and pickup of RFI, which all cause the AD608 to
“l(fā)ose” the low end (typically below –65 dBm) of its RSSI output
and cause the limiter to swing randomly. Both poor board lay-
out and incorrect component values in the offset feedback loop
can cause low level oscillations. Pickup of RFI can be caused by
improper layout and shielding of the circuit.
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| AD608AR | 功能描述:IC MIXER/LIMITER 3V IF 16-SOIC RoHS:否 類(lèi)別:RF/IF 和 RFID >> RF 混頻器 系列:AD608 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- RF 型:W-CDMA 頻率:2.11GHz ~ 2.17GHz 混頻器數(shù)目:1 增益:17dB 噪音數(shù)據(jù):2.2dB 次要屬性:- 電流 - 電源:11.7mA 電源電壓:2.7 V ~ 3.3 V 包裝:托盤(pán) 封裝/外殼:12-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:12-QFN-EP（3x3） |
| AD608AR-REEL | 功能描述:IC MIXER/LIMITER 3V IF 16-SOIC RoHS:否 類(lèi)別:RF/IF 和 RFID >> RF 混頻器 系列:AD608 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- RF 型:W-CDMA 頻率:2.11GHz ~ 2.17GHz 混頻器數(shù)目:1 增益:17dB 噪音數(shù)據(jù):2.2dB 次要屬性:- 電流 - 電源:11.7mA 電源電壓:2.7 V ~ 3.3 V 包裝:托盤(pán) 封裝/外殼:12-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:12-QFN-EP（3x3） |
| AD608AR-REEL7 | 功能描述:INTEGRATED CIRCUIT 制造商:analog devices inc. 系列:- 包裝:帶卷（TR） 零件狀態(tài):最後搶購(gòu) RF 類(lèi)型:FM，GSM，PM，PHS，F(xiàn)M 頻率:500MHz 混頻器數(shù):1 增益:24dB 噪聲系數(shù):16dB 輔助屬性:帶放大器 電流 - 電源:7.3mA 電壓 - 電源:2.7 V ~ 5.5 V 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商器件封裝:16-SOIC 標(biāo)準(zhǔn)包裝:1 |
| AD608ARZ | 功能描述:IC MIXER/LIMITER IF 3V 16-SOIC RoHS:是 類(lèi)別:RF/IF 和 RFID >> RF 混頻器 系列:AD608 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- RF 型:W-CDMA 頻率:2.11GHz ~ 2.17GHz 混頻器數(shù)目:1 增益:17dB 噪音數(shù)據(jù):2.2dB 次要屬性:- 電流 - 電源:11.7mA 電源電壓:2.7 V ~ 3.3 V 包裝:托盤(pán) 封裝/外殼:12-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:12-QFN-EP（3x3） |
| AD608ARZ | 制造商:Analog Devices 功能描述:IC MIXER/LIMITER ((NW)) |
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