T4260-IL Atmel, T4260-IL Datasheet - Page 17

• 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: -

SW2/AGC (Pin 11)
Test Mode
AM Mixer
4528J–AUDR–11/04
The pin SW2/AGC works as a switching output (open drain, pin 11) or as an AM AGC-
control pin to control the cascade stage of an external AM-preamplifier.
The SW2/AGC is controlled by bits 47 and 48 as given in Table 16.
Table 16. Switching Output 2/AGC Mode
Note:
Figure 6. Internal Components at SW2/AGC
A special test mode is implemented for final production test only. This mode is activated
by setting bit 123 = 1. This mode is not intended to be used by customer application. For
normal operation bit 123 has to be set to 0.
Table 17. Test Mode
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 Table 18 on page
18. (The VCO divider is only active in AM mode)
In AGC mode, the output voltage is 6 V down to 1 V.
SWO/AGC
AGC function
SW2/AGC
Test Mode
High
Low
OFF
ON
B48
0
1
1
SW2
AGC
B123
1
0
V
S
B47
X
0
1
T4260
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