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Numéro de référence | ATR4256 | ||
Description | Frequency Synthesizer | ||
Fabricant | ATMEL Corporation | ||
Logo | |||
1 Page
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
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Pages | Pages 21 | ||
Télécharger | [ ATR4256 ] |
No | Description détaillée | Fabricant |
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ATR4256 | Frequency Synthesizer | ATMEL Corporation |
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