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PDF ATR4256 Data sheet ( Hoja de datos )
| Número de pieza | ATR4256 | |
| Descripción | Frequency Synthesizer | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Reference Oscillator up to 15 MHz (Tuned)
• Oscillator Buffer Output (for AM Up/Down Conversion)
• Two Programmable 16-bit Dividers
• Fine-tuning Steps Possible
• Fast Response Time Due to Integrated Loop Push-pull Stage
• 3-wire Bus (Enable, Clock and Data; 3V and 5V Microcontrollers Acceptable)
• Four Programmable Switching Outputs (Open Drain)
• Three DACs for Software Controlled Tuner Alignment
• Low-power Consumption
• High Signal to Noise Ratio (SNR)
• Integrated Band Gap – Only One Supply Voltage Necessary
1. Description
The ATR4256 is a synthesizer IC for FM receivers and an AM up-conversion system
in BiCMOS technology. Together with the AM/FM IC ATR4258 or ATR4255, it com-
prises a complete AM/FM car radio front-end, which is also recommended for RDS
(Radio Data System) applications. It is controlled by a 3-wire bus and also contains
switches and Digital to Analog Converters (DACs) for software-controlled alignment of
the AM/FM tuner. The ATR4256 is the pin-compatible successor IC of U4256BM-R.
Figure 1-1. Block Diagram
Tuning
SWO1 SWO2 SWO3 SWO4
7 8 9 10
13
OSCIN
12 Oscillator
OSCOUT
15
MX2LO
OSC
buffer
17
CLK
16
3-wire
DATA
bus
EN 18 interface
Switching outputs
DAC3
3-bit
VRef
DAC2
DAC1
5
DAC3
4
DAC2
3
DAC1
R-
divider
DAC
AM/FM
VRef
19
FMOSCIN
FM-
preamp
20
GNDAN
N-
divider
Phase
detector
Band gap
14
V5
Current
sources
11
GND
6
VS
1
PDO
2
PD
www.DataSheet4U.com
Frequency
Synthesizer for
Radio Tuning
ATR4256
4867D–AUDR–01/08
1 page  
4.3 FMOSCIN (Pin 19)
FMOSCIN is the preamplifier input for the FM oscillator signal.
Figure 4-2. Internal Components at FMOSCIN
ATR4256
www.DataSheet4U.com
V5
FMOSCIN
4.4 MX2LO (Pin 15)
MX2LO is the buffered output of the crystal oscillator. This signal can be used as a reference fre-
quency for ATR4255 or ATR4258. The oscillator buffer output can be switched by the OSCB bit
(B69) as follows.
Table 4-2.
MX2LO Settings
MX2LO AC Voltage
ON
OFF
Figure 4-3. Internal Components at MX2LO
V5
V5
B69
0
1
OSCIN
MX2LO
4867D–AUDR–01/08
5
5 Page 
Figure 4-9. Internal Components at OSCIN and OSCOUT
V5
ATR4256
www.DataSheet4U.com
OSCIN
V5
OSCOUT
Figure 4-10. Internal Connection of Tuning Capacity for Crystal Oscillator
Cx1 Cx2
8 pF 32 pF
...
0.5 pF
INV
0.5 pF
...
32 pF 8 pF
B78
B84
B85
4867D–AUDR–01/08
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet ATR4256.PDF ] | |
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