T4260-ILSH Atmel, T4260-ILSH Datasheet - Page 22

• 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: -

10.19 Charge Pump (AMLF/FMLF)
10.20 External Voltage at AMLF (Oscillator)
22
T4260
AMLF/FMLF is the current charge pump output of the PLL. The current can be controlled by set-
ting 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 fre-
quency changes. After the frequency change, the current will be reduced to guarantee 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 10-22. High-current Charge Pump
The current of the low-current charge pump is controlled by bit 63 as given in
Table 10-23. 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 10-24 on page
Table 10-24. Oscillator Operating Modes
Oscillator
OFF
ON
ON
High-current Charge Pump
Low Current Charge Pump
100 µA
50 µA
22.
1 mA
2 mA
Oscillator Buffer
OUTPUT
INPUT
OFF
AMLF (standard)
AMLF (standard)
INPUT f. DAC’s
AMLF (Pin 17)
B62
B63
0
1
0
1
Table
B65
Table
0
1
1
4528N–AUDR–11/09
10-23.
10-22.
B64
X
0
1