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參數(shù)資料
| 型號： | T4260 |
| 廠商： | Atmel Corp. |
| 英文描述： | AM/FM Front End IC |
| 中文描述： | 調(diào)幅/調(diào)頻前端IC |
| 文件頁數(shù)： | 26/31頁 |
| 文件大?。?/td> | 299K |
| 代理商： | T4260 |
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26
T4260
4528G–AUDR–12/03
Charge Pump Current
Settings
Bit 62 (0 = 1 mA; 1 = 2 mA) allows to adjust the high current, which is active during a fre-
quency change (if the delay time of the active HCDEL register is not switched off). A
high charge pump current allows faster frequeny 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 μA; 1 = 100 μA). 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
= f
VCO
- f
IF
f
VCO
= AM prescaler
x
(f
rec
+ f
IF
)
The following formula can also be useful by AM frequencies higher than 20 MHz:
f
VCO
= AM prescaler
x
(f
rec
- f
IF
)
Table 28.
AM Prescaler (Divider) Settings and the Reception Frequencies
Minimum Reception
Frequency [MHz]
no divider
Divide by 2
Divide by 3
Divide by 4
Divide by 5
Divide by 6
Divide by 7
Divide by 8
Divide by 9
Divide by 10
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 (V
TUNE
) of 1.5 V
to VSPLL - 1 V for a good S/N performance.
Divider (AM Prescaler)
Maximum Reception
Frequency [MHz]
113.3
51.3
30.633
20.3
14.1
9.967
7.014
4.8
3.078
1.7
87.5
38.4
22.033
13.85
8.94
5.667
3.329
1.575
0.211
0
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相關代理商/技術參數(shù) |
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| T4260_08 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:AM/FM Front End IC |
| T4260_09 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:AM/FM Front End IC |
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| T4260-IL | 功能描述:IC RECEIVER AM/FM FRONT 44-SSOP RoHS:否 類別:RF/IF 和 RFID >> RF 接收器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 09/Jan/2012 標準包裝:50 系列:* 頻率:850MHz ~ 2.175GHz 靈敏度:- 數(shù)據(jù)傳輸率 - 最大:- 調(diào)制或協(xié)議:- 應用:* 電流 - 接收:* 數(shù)據(jù)接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 特點:- 電源電壓:4.75 V ~ 5.25 V 工作溫度:0°C ~ 85°C 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
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