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參數(shù)資料
| 型號： | U4256BM-RFS |
| 廠商： | ATMEL CORP |
| 元件分類： | 消費家電 |
| 英文描述： | Frequency Synthesizer for Radio Tuning |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 封裝： | SSO-20 |
| 文件頁數(shù)： | 1/19頁 |
| 文件大小： | 403K |
| 代理商： | U4256BM-RFS |
1
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; 3 V and 5 V Microcontrollers Acceptable)
Four Programmable Switching Outputs (Open Drain)
Three DACs for Software Controlled Tuner Alignment
Low-power Consumption
High S/N Ratio
Integrated Band Gap – only One Supply Voltage Necessary
Description
The U4256BM-R is a synthesizer IC for FM receivers and an AM up-convertion
system in BICMOS technology. Together with the AM/FM IC T4258 or U4255BM, it
performs a complete AM/FM car radio front-end, which is recommended also 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 U4256BM-R is the pin-compatible succesor IC of U4256BM-N.
Pin Configuration
Figure 1.
Pinning SSO20
1
2
3
4
5
6
7
8
1
1
1
1
1
1
1
2
E
D
C
S
S
S
S
G
O
O
M
V
P
P
D
V
9
1
1
F
D
G
1
D
U
Frequency
Synthesizer for
Radio Tuning
U4256BM-R
Preliminary
Rev. 4562C–AUDR–08/04
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