U2270B-MFPY Atmel, U2270B-MFPY Datasheet - Page 7
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U2270B-MFPY
Manufacturer Part Number
U2270B-MFPY
Description
IC BASEREADER RFID 125KHZ 16SOIC
Manufacturer
Atmel
Series
U2270Br
Specifications of U2270B-MFPY
Rf Type
Read / Write
Frequency
125kHz
Features
Read/Write Base Station
Package / Case
16-SOIC (0.154", 3.90mm Width)
Current Consumption
4.5mA
Supply Voltage Range
4.5V To 6.3V
Rf Ic Case Style
SOIC
No. Of Pins
16
Filter Terminals
SMD
Ic Generic Number
2270
Operating Temperature Range
-40°C To +105°C
Rohs Compliant
Yes
Pin Count
16
Screening Level
Industrial
Package Type
SOIC
Operating Temperature Max
105°C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
U2270B-MFPY
Manufacturer:
MICROCHIP
Quantity:
1 200
Part Number:
U2270B-MFPY
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
3.4
3.5
4684E–RFID–02/08
Low-pass Filter (LPF)
Amplifier (AMP)
The fully integrated low-pass filter (4th-order Butterworth) removes the remaining carrier signal
and high-frequency disturbances after demodulation. The upper cut-off frequency of the LPF
depends on the selected oscillator frequency. The typical value is f
f
A high-pass characteristic results from the capacitive coupling at the input pin 4 as shown in
ure
impedances of the signal source and LPF input (typical 210 k ) have to be considered. The rec-
ommended values of the input capacitor for selected data rates are given in
“Applications”
Note:
Figure 3-6.
The differential amplifier has a fixed gain, typically 30. The HIPASS pin is used for DC decou-
pling. The lower cut-off frequency of the decoupling circuit can be calculated as follows:
The value of the internal resistor R
Recommended values of C
on
f
Osc
cut
page
=
/ 25 are possible if bi-phase or Manchester encoding is used.
3-6. The input voltage swing is limited to 2 V
--------------------------------------------
2
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.
1
C
, on
Equivalent Circuit of Pin Input
HP
page
R
i
10.
HP
R
for selected data rates can be found in
S
C
i
IN
can be assumed to be 2.5 k .
Input
V
Bias
10 k
- 0.4V
pp
. For frequency response calculation, the
V
Bias
+ 0.4V
210 k
Osc
Section
/ 18, and data rates up to
4.,
“Applications”
U2270B
Section
Fig-
4.,
7
,