參數(shù)資料
型號(hào)： T4260ILS
廠商： ATMEL CORP
元件分類(lèi)： 調(diào)諧器
英文描述： AUDIO TUNER, PDSO44
封裝： SSO-44
文件頁(yè)數(shù)： 6/30頁(yè)
文件大?。?/td> 299K
代理商： T4260ILS
14
T4260
4528I–AUDR–08/04
IF Amplifier
The IF gain amplifier can be used in AM and FM mode to compensate the loss of the
external ceramic bandfilters.
The IF gain can be controlled in 2-dB steps by setting bit 6 to bit 9 as given in Table 6.
The selection of the IF amplifier input can be controlled by bit 11 as given in Table 7.
Note:
The AM input (pin 35) has an input impedance of 2.5 k
for matching with a crystal filter.
The FM input (pin 36) has an input impedance of 330
for matching with a ceramic filter.
VCO
The VCO HI/LO function is controlled by means of bit 10.
RF-AGC
The AM and FM RF-AGC controls the current into the AM and FM pin diodes (FM pin 3
and AM pin 9) to limit the level at the AM or FM mixer input. If the level at the AM or FM
mixer input exceeds the selected threshold, then the current into the AM or FM pin
diodes increases. If this step is not sufficient in AM mode, the source drain voltage of the
MOSFET (pin 11) can be decreased. In AM mode, the time constants can be selected
by the external capacitors at pin 42 (RFAGCA1) and at pin 12 (RFAGCAM2) and in FM
mode by an external capacitor at pin 33 (RFAGCFM). In AM mode, the double pole (by
the capacitors at pin 42 and pin 12) allows a better harmonic distortion by a higher time
constant.
The RF-AGC can be controlled in 1-dB steps by setting the bits 12 to 15. The values for
FM and AM are controlled by bit 17.
Table 6. IF Gain
IF Gain
B9
B8
B7
B6
12 dB
0
14 dB
0
1
16 dB
0
1
0
18 dB
0
1
20 dB
0
1
0
...
40 dB
1
0
42 dB
1
Table 7. IF-IN Operating Mode
IF-IN AM/FM
B11
IF-IN FM
0
IF-IN AM
1
Table 8. VCO Operating Mode
VCO HI/LO
B10
VCO high current
0
VCO low current
1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
T4260-ILSH 功能描述:射頻無(wú)線雜項(xiàng) COM.RADIO-AM/FM FE DIG.CONCEPT RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel
T428P107M028AH 功能描述:鉭質(zhì)電容器-固體SMD RoHS:否 制造商:AVX 電容:100 uF 電壓額定值:20 V ESR: 容差:10 % 外殼代碼 - in:2917 外殼代碼 - mm:7343 高度:4.1 mm 制造商庫(kù)存號(hào):E Case 工作溫度范圍:- 55 C to + 125 C 系列:TBM 產(chǎn)品:Tantalum Solid Low ESR Commercial Grade 封裝:Bulk
T428P156M050AH 功能描述:鉭質(zhì)電容器-固體SMD RoHS:否 制造商:AVX 電容:100 uF 電壓額定值:20 V ESR: 容差:10 % 外殼代碼 - in:2917 外殼代碼 - mm:7343 高度:4.1 mm 制造商庫(kù)存號(hào):E Case 工作溫度范圍:- 55 C to + 125 C 系列:TBM 產(chǎn)品:Tantalum Solid Low ESR Commercial Grade 封裝:Bulk
T428P156M050AH6110 功能描述:鉭質(zhì)電容器-固體SMD 50volts 15uF 20% RoHS:否 制造商:AVX 電容:100 uF 電壓額定值:20 V ESR: 容差:10 % 外殼代碼 - in:2917 外殼代碼 - mm:7343 高度:4.1 mm 制造商庫(kù)存號(hào):E Case 工作溫度范圍:- 55 C to + 125 C 系列:TBM 產(chǎn)品:Tantalum Solid Low ESR Commercial Grade 封裝:Bulk
T428P156M050AHT500 制造商:KEMET Corporation 功能描述:CAP TANT 15UF 50V 20% 2824
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