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| 型號： | U2270B |
| 英文描述： | Read / Write Base Station IC |
| 中文描述： | 讀/寫基站集成電路 |
| 文件頁數(shù)： | 5/13頁 |
| 文件大?。?/td> | 146K |
| 代理商： | U2270B |
U2270B
TELEFUNKEN Semiconductors
Rev. A3, 13-Dec-96
5 (13)
Oscillator (Osc)
The frequency of the on-chip oscillator is controlled by a
current fed into the R
F
input. An integrated compensation
circuit ensures a widly temperature and supply voltage in-
dependent frequency which is selected by a fixed resistor
between R
F
(pin 15) and V
S
(pin 14). For 125 kHz a resis-
tor value of 110 k is defined. For other frequencies, use
the following formula:
R
f
1[kHz]– 5 k
f
0
This input can be used to adjust the frequency close to the
resonance of the antenna. For more details refer to the ap-
plicatons and the application note ANT019.
V
CC
R
F
2 k
9695
R
f
Figure 8. Equivalent circuit of Pin R
F
Filter (LPF)
The fully-integrated low-pass filter (4th order butter-
worth) removes the remaining carrier signal and
high-frequency disturbancies after demodulation. The
upper cut-off frequency of the LPF depends on the se-
lected oscillator frequency. The typ. value is fosc/18. That
means that data rates up to fosc/25 are possible if Bi-phase
or Manchester encoding is used.
A high-pass characteristic results from the capacitive
coupling at the input Pin 4, as shown in figure 9. The input
voltage swing is limited to 2 V
pp
. For frequency response
calculation, the impedances of the signal source and LPF
input (typ. 220 k ) have to be considered. The recom-
mended values of the input capacitor for selected data
rates are shown in the chapter “Applications”.
Note:
After switching on the carrier, the dc voltage of
the coupling capacitor changes rapidly. When
the antenna voltage is stable, the LPF needs
approximately 2 ms to recover full sensitivity.
10 k
210 k
V
Bias
– 0.4 V
C
IN
R
S
~
12601
V
Bias
+ 0.4 V
V
Bias
Figure 9. Equivalent circuit of Pin Input
Amplifier (AMP)
The differential amplifier has a fixed gain, typically 30.
The HIPASS pin is used for dc decoupling. The lower
cut–off frequency of the decoupling circuit can be
calculated as follows:
f
cut
1
2
C
HP
R
i
The value of the internal resistor R
i
can be assumed to be
2.5 k .
Recommended values of C
HP
for selected data rates can
be found in the chapter “Applications”.
+
–
V
Ref
R
R
R
R
R
i
Schmitt
trigger
LPF
HIPASS
C
HP
12578
Figure 10. Equivalent circuit of pin HIPASS
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| U2270B_08 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Read/Write Base Station |
| U2270B-MFP | 功能描述:IC RFID BASEREADER 125KHZ 16SOIC RoHS:否 類別:RF/IF 和 RFID >> RFID IC 系列:U2270B 其它有關(guān)文件:CR14 View All Specifications 標準包裝:1 系列:- RF 型:收發(fā)器 頻率:13.56MHz 特點:ISO14443-B 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SO 包裝:Digi-Reel® 其它名稱:497-5719-6 |
| U2270B-MFPG3 | 功能描述:IC BASEREADER RFID 125KHZ 16SOIC RoHS:是 類別:RF/IF 和 RFID >> RFID IC 系列:U2270B 其它有關(guān)文件:CR14 View All Specifications 標準包裝:1 系列:- RF 型:收發(fā)器 頻率:13.56MHz 特點:ISO14443-B 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SO 包裝:Digi-Reel® 其它名稱:497-5719-6 |
| U2270B-MFPG3Y | 功能描述:射頻無線雜項 Base Station RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
| U2270B-MFPY | 功能描述:射頻無線雜項 Base Station RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
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