T4260-IL Atmel, T4260-IL Datasheet - Page 19

• 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: -

Spurious Suppression
Charge Pump (AMLF/FMLF)
External Voltage at AMLF
(Oscillator)
4528J–AUDR–11/04
In fractional and direct shift mode the spurious suppression is able by SW wire and SW
impulse.
Table 21. Spurious Suppression by SW Wire
Table 22. Spurious Suppression by Correction Current Charge Pump
AMLF/FMLF is the current charge pump output of the PLL. The current can be con-
trolled by setting the bits 62 and 63. The loop filter has to be designed correspondingly
to the chosen pump current and the internal reference frequency.
During the frequency change, the high-current charge pump (bit 62) is active to enable
fast frequency changes. After the frequency change, the current will be reduced to guar-
antee a high S/N ratio. The low-current charge pump (bit 63) is then active. The high
current charge pump can also be switched off by setting the bits of the active HCDEL
register to 0 (bit 20 and bit 21 [HCDEL 1] or bit 22 and bit 23 [HCDEL 2]).
The current of the high-current charge pump is controlled by bit 62 as given in Table 23.
Table 23. High-current Charge Pump
The current of the low-current charge pump is controlled by bit 63 as given in Table 24.
Table 24. Low-current Charge Pump
The oscillator (pin 22) can be switched on/off by bit 65. It is possible to use the oscillator
buffer as an input or as an output. At the AMLF (pin 17), an external tuning voltage can
be applied (bit 65 = 0). If this is not done, the IC operates in standard mode (bit 65 = 1).
The oscillator, oscillator buffer and the AMLF are controlled by the bits 65 and 64 as
given in Table 25 on page 20.
High-current Charge Pump
Low Current Charge Pump
SW Impulse
SW Wire
100 µA
50 µA
1 mA
2 mA
OFF
OFF
ON
ON
B61
B60
B63
B62
0
1
0
1
0
1
0
1
T4260
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