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T4260 Datasheet

  • T4260

  • AM/FM Front End IC

  • 31頁(yè)

  • ATMEL   ATMEL

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Features
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AM/FM Tuner Front End with Integrated PLL
AM Up-conversion System (AM-IF: 10.7 MHz)
FM Down-conversion System (FM-IF: 10.7 MHz)
IF Frequencies up to 25 MHz
Fine-tuning Steps: AM = 1 kHz and FM = 50 kHz/25 kHz/12.5 kHz
Fast Fractional PLL (Lock Time < 1 ms) Inclusive Spurious Compensation
Fast RF-AGC, Programmable in 1-dB Steps
Fast IF-AGC, Programmable in 2-dB Steps
Fast Frequency Change by 2 Programmable N-divider
Two DACs for Automatic Tuner Alignment
High S/N Ratio
3-wire Bus (Enable, Clock and Data; 3 V and 5 V Microcontrollers-compatible)
AM/FM
Front End IC
T4260
Description
The T4260 is an advanced AM/FM receiver with integrated fast PLL as a single-chip
solution based on Atmel鈥檚 high-performance BICMOS II technology. The low-imped-
ance driver at the IF output is designed for the A/D of a digital IF. The fast tuning
concept realized in this part is based on patents held by Atmel and allows lock times
less than 1 ms for a jump over the FM band with a step width of 12.5 kHz. The AM
up-conversion and the FM down-conversion allows an economic filter concept. An
automatic tuner alignment is provided by built-in DACs for gain and offset compensa-
tion. The frequency range of the IC covers the FM broadcasting band as well as the
AM band. The low current consumption helps the designers to achieve economic
power consumption concepts and helps to keep the power dissipation in the tuner low.
Pin Description
Figure 1.
Pinning SSO44
RFAGCFM
REFFREQ
RFAGCA1
IFAGCFM
MXAMOA
MXAMOB
MXFMOB
MXFMOA
IFAGCA1
IFOUTA
IFOUTB
GNDPLL
IFINAM
IFINFM
VRPLL
IFREF
GNDT
DATA
VST
VRT
CLK
24
OSCB
21
32
31
30
29
28
33
43
42
41
40
39
38
37
44
36
35
34
27
26
25
11
3
1
2
4
5
6
7
8
9
10
12
13
14
15
16
17
18
19
OSCE
SW1
20
SW2/AGC
RFAGCA2
FMAGCO
IFAGCA2
AMAGCO
MXFMIB
MXAMIB
MXFMIA
MXAMIA
OSCGND
OSCBUF
GNDRF
VRVCO
DAC1
DAC2
VSPLL
VTUNE
FMLF
AMLF
22
23
EN
Rev. 4528G鈥揂UDR鈥?2/03

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