參數(shù)資料
型號(hào)： 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)： 19/30頁
文件大?。?/td> 299K
代理商： T4260ILS
26
T4260
4528I–AUDR–08/04
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; fstep = 10 kHz; fIF = 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/fstep = 4 MHz/10 KHz = 400
N = AM Prescaler
× (f
rec + fIF)/fstep = 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
voltage factor ratio of 100/16 (R
1/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 R
1 with 100 k and R2 with 16 k. The
allowed range of R
1 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 Conditions” on page 21).
VSWAMLF x ([R1 + R2]/R2) x DAC gain factor + DAC offset < VS + 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 < (VS + 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 + fIF)/fstep
(AM mode)
N = (f
rec + fIF)/fstep
(FM mode)
R = f
ref/fstep
(For all modes)
f
VCO = N × fstep
f
ref = reference oscillator frequency (pin 27)
R
1
Gain
VTUNE or DAC
R
2
T4260
AMLF
T4260
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