T4260-ILQH Atmel, T4260-ILQH Datasheet - Page 15

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

Specifications of T4260-ILQH

• 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: -

10.3
10.4
10.5
4528N–AUDR–11/09
N1/N2
IF Amplifier
VCO
The N2/N1 bit controls the active N-divider. Only one of the two N-Divider can be active. The
N1-Divider is activated by setting bit 5 = 0, the N2-Divider by setting bit 5 = 1.
Table 10-4.
The IF gain amplifier can be used in AM and FM mode to compensate the loss of the external
ceramic bandfilters.
The IF gain can be controlled in 2-dB steps by setting bit 6 to bit 9 as given in
Table 10-5.
The selection of the IF amplifier input can be controlled by bit 11 as given in
Table 10-6.
The AM input (pin 35) has an input impedance of 2.5 k for matching with a crystal filter. The FM
input (pin 36) has an input impedance of 330 for matching with a ceramic filter.
The VCO HI/LO function is controlled by means of bit 10.
Table 10-7.
IF Gain
12 dB
14 dB
16 dB
18 dB
20 dB
40 dB
42 dB
...
N-Divider
IF Gain
IF-IN Operating Mode
VCO Operating Mode
VCO high current
VCO low current
IF-IN AM/FM
VCO HI/LO
N1-divider active
N2-divider active
IF-IN FM
IF-IN AM
N2/N1
B9
...
0
0
0
0
0
1
1
B8
...
0
0
0
0
1
1
1
B7
...
0
0
1
1
0
1
1
B11
B10
0
1
0
1
B5
0
1
Table
Table
10-6.
10-5.
T4260
B6
...
0
1
0
1
0
0
1
15