T4260-IL Atmel, T4260-IL Datasheet - Page 13

• Manufacturer Part Number: T4260-IL
• Description: IC RECEIVER AM/FM FRONT 44-SSOP
• Manufacturer: Atmel

Specifications of T4260-IL

• 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: Contains lead / RoHS non-compliant
• Features: -
• Sensitivity: -
• Memory Size: -
• Data Rate - Maximum: -

Bus Control
IF-AGC
PD Test
N1/N2
4528J–AUDR–11/04
The IF-AGC controls the level of the IF signal that is passed to the external ceramic filter
and the IF input (AM pin 35 or FM pin 36 and pin 34). In AM mode the time constant can
be selected by the external capacitors at pin 32 (IFAGCA1) and pin 10 (IFAGCA2) and
in FM mode by an external capacitor at pin 31 (IFAGCFM). In AM mode, the double pole
(by the capacitors at pin 32 and pin 10) allows a better harmonic distortion by a lower
time constant.
The IF-AGC threshold can be controlled by setting bits 0 to 2 as given in Table 2.
Table 2. IF-AGC Threshold
The IF-AGC ON/OFF can be controlled by bit 16 as given in Table 3.
Table 3. IF-AGC
A special test mode for PD is implemented for final production test only. This mode is
activated by setting bit 3 = 1. This mode is not intended to be used by customer
application. For normal operation bit 3 has to be set to 0.
Table 4. PD-Test Mode
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 5. N-Divider
Pin 17 = AMLF output (standard)
109 dBµV
111 dBµV
113 dBµV
115 dBµV
117 dBµV
118 dBµV
119 dBµV
121 dBµV
IF-AGC
Pin 17 = PD Test mode
IF-AGC ON/OFF
IF-AGC OFF
IF-AGC ON
N1-divider active
N2-divider active
PD TE/PD
N2/N1
B2
0
0
0
0
1
1
1
1
B1
0
0
1
1
0
0
1
1
B16
B3
0
1
0
1
B5
0
1
T4260
B0
0
1
0
1
0
1
0
1
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