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參數(shù)資料
| 型號(hào)： | 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)： | 27/31頁 |
| 文件大?。?/td> | 299K |
| 代理商： | T4260 |
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27
T4260
4528G–AUDR–12/03
The N- and R- divider can be calculated as following:
Example of AM settings:
If the receiving frequency is 0.84 MHz (AM) and the following conditions are:
f
ref
= 4 MHz; f
step
= 10 kHz; f
IF
= 10.7 MHz and an AM-Prescaler of 10 a N-Divider of
11540 and a R-Divider of 400 is necessary.
R = f
ref
/f
step
= 4 MHz/10 KHz = 400
N = AM Prescaler
×
(f
rec
+ f
IF
)/f
step
= 10
×
(0.84 MHz + 10.7 MHz)/10 KHz = 11540
External Voltage at AMLF
(Pin 17)
By using two ICs, for example, it is possible to operate the AMLF (Pin 17) of the second
IC either with the tuning voltage (Vtune [Pin 18]), the DAC 1 voltage [Pin 1] or the DAC 2
voltage [Pin 2] from the first T4260. For voltage reduction at the AMLF [Pin 17], a volt-
age factor ratio of 100/16 (R1/R2) is required.
This means that an applied voltage from 0.5 V at Pin 17 (AMLF) corresponds to a tuning
voltage of 3.625 V. It is recommended to use R1 with 100 k
and R2 with 16 k
. The
allowed range of R1 is 10 k
to 1 M
and 1.6 k
to 160 k
for R2.
Figure 12.
External Voltage at AMLF (Pin 17)
The maximum input voltage at the AMLF input (Pin 17) depends on the applied supply
voltage as well as on the gain and offset settings. To avoid any damages during the
product’s lifetime, the following formulas regarding SWAMLF voltage, gain and offset
settings have to be observed (see chapter “Permitted DAC Conditons” on page 22).
V
SWAMLF
x ([R1 + R2] / R2) x DAC gain factor + DAC offset < V
S
+ 3 V
(R1 + R2) / R2 = 7.25
This means when having a gain factor of 2 and an offset value of 1 V, the applied
SWAMLF voltage should be limited to a voltage lower than 0.83 V.
SWAMLF voltage < (V
S
+ 3 V - DAC offset) / (DAC gain factor
×
7.25)
e.g.: maximum SWAMLF voltage = (10 V + 3 V - 1 V) / (2
×
7.25) = 0.83 V
It is also possible to reduce the gain or offset instead (or along with) the SWAMLF
voltage.
N = AM Prescaler
×
(f
rec
+ f
IF
)/f
step
N = (f
rec
+ f
IF
)/f
step
R = f
ref
/f
step
f
VCO
= N
×
f
step
f
ref
= reference oscillator frequency (pin 27)
(AM mode)
(FM mode)
(For all modes)
R1
Gain
Vtune or DAC
R2
T4260
AMLF
T4260
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相關(guān)代理商/技術(shù)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 |
| T4260IL | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:AM/FM Front End IC |
| 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(xùn)模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 09/Jan/2012 標(biāo)準(zhǔn)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(yīng)用:* 電流 - 接收:* 數(shù)據(jù)接口:PCB，表面貼裝 存儲(chǔ)容量:- 天線連接器:PCB，表面貼裝 特點(diǎn):- 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(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| T4260ILQ | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:AM/FM Front End IC |
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