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參數(shù)資料
| 型號： | T4260ILS |
| 廠商： | ATMEL CORP |
| 元件分類： | 調(diào)諧器 |
| 英文描述： | AUDIO TUNER, PDSO44 |
| 封裝： | SSO-44 |
| 文件頁數(shù)： | 18/30頁 |
| 文件大?。?/td> | 299K |
| 代理商： | T4260ILS |
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25
T4260
4528I–AUDR–08/04
Charge Pump Current
Settings
Bit 62 (0 = 1 mA; 1 = 2 mA) allows to adjust the high current, which is active during a
frequency change (if the delay time of the active HCDEL register is not switched off). A
high charge pump current allows faster frequency changes. After a frequency change,
the current reduction is reduced (in locked mode) to the low current which is set by
bit 63 (0 = 50 A; 1 = 100 A). A lower charge pump current guarantees a higher S/N
ratio.
The high current charge pump can be switched off by the active HCDEL register bits. In
this case, when HCDEL 1 is active and the bits 20 and 21 are 0 (HCDEL 1 delay time =
off) or HCDEL 2 is active and the bits 22 and 23 are 0 (HCDEL 2 delay time = off), only
the low current charge pump (current) is active in locked and in the frequency change
mode.
AM Prescaler (Divider)
Settings
The AM mixer is used for up-conversion of the AM reception frequency to the IF fre-
quency. Therefore, an AM prescaler is implemented to generate the necessary LO from
the VCO frequency. For the reception of the AM band, different prescaler (divider) set-
tings are possible.
Table 28 lists the AM prescaler (divider) settings and the reception frequencies.
f
VCO = 98.2 MHz to 124 MHz
f
IF = 10.7 MHz
f
rec = fVCO - fIF
f
VCO = AM prescaler x (frec + fIF)
The following formula can also be useful by AM frequencies higher than 20 MHz:
f
VCO = AM prescaler x (frec - fIF)
Note:
The AM Prescaler Divider Settings with f
VCO from 98.2 MHz to 124 MHz is only an exam-
ple. The tuning range depends on the tuning diode and the inductor in the VCO circuit.
The tank of the VCO should be designed for a maximum range at pin 18 (VTUNE) of
1.5 V to VSPLL - 1 V for a good S/N performance.
Table 28. AM Prescaler (Divider) Settings and the Reception Frequencies
Divider (AM Prescaler)
Minimum Reception
Frequency [MHz]
Maximum Reception
Frequency [MHz]
No divider
87.5
113.3
Divide by 2
38.4
51.3
Divide by 3
22.033
30.633
Divide by 4
13.85
20.3
Divide by 5
8.94
14.1
Divide by 6
5.667
9.967
Divide by 7
3.329
7.014
Divide by 8
1.575
4.8
Divide by 9
0.211
3.078
Divide by 10
0
1.7
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| T4260-ILSH | 功能描述:射頻無線雜項 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 制造商庫存號: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 制造商庫存號: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 制造商庫存號: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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