T4260-ILSH Atmel, T4260-ILSH Datasheet - Page 20

• Manufacturer Part Number: T4260-ILSH
• Description: IC AM/FM FRONT END W/PLL 44SSOP
• Manufacturer: Atmel

Specifications of T4260-ILSH

• Frequency: AM, FM
• Modulation Or Protocol: AM, FM
• Applications: AM/FM Radio Receiver
• Current - Receiving: 85mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 8 V ~ 10 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Sensitivity: -
• Memory Size: -
• Data Rate - Maximum: -

10.14 AM Mixer
10.15 FM Mixer
10.16 PLL Loop Filter
20
T4260
The AM mixer is used for up-conversion of the AM reception frequency to the IF frequency.
Therefore, an AM prescaler is implemented to generate the necessary LO frequency from the
VCO frequency.
The VCO divider can be controlled by the bits 140 to 143 as given in
divider is only active in AM mode)
Table 10-17. Divider Factor of the AM Prescaler
In the FM mixer stage, the FM reception frequency is down-converted to the IF frequency. The
VCO frequency is used as LO frequency for the mixer.
The PLL loop filter selection for AM and FM mode can be controlled by bit 145 as given in
10-18.
Table 10-18. Loop Filter Operating Mode
Divider AM Prescaler
Divide by 10
Divide by 2
Divide by 3
Divide by 4
Divide by 5
Divide by 6
Divide by 7
Divide by 8
Divide by 9
PDAM/PDFM
PDFM active
PDAM active
B143
0
0
0
0
0
0
0
0
1
B142
0
0
0
0
1
1
1
1
x
B145
B141
Table
0
1
0
0
1
1
0
0
1
1
x
10-17. (The VCO
4528N–AUDR–11/09
B140
0
1
0
1
0
1
0
1
x
Table