T4227-FB Atmel, T4227-FB Datasheet - Page 3

• Manufacturer Part Number: T4227-FB
• Manufacturer: Atmel

Specifications of T4227-FB

• Operating Supply Voltage (typ): 1.8/2.5/3.3/5V
• Operating Supply Voltage (min): 1.1V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 16
• Lead Free Status / RoHS Status: Not Compliant

Pin Layout SSO16
IN1, IN2
A ferrite antenna is connected between IN1 and IN2. For
high sensitivity, the Q factor of the antenna circuit should
be as high as possible. Please note that a high Q factor
requires temperature compensation of the resonant
frequency in most cases. We recommend a Q factor
between 80 and 150. An optimal signal-to-noise ratio will
be achieved by a resonant resistance of 40 kW to 80 kW.
Rev. A3, 20-Mar-01
GND
VCC
RFO
VCC
GND
RFI
IN2
IN1
n.c.
n.c.
IN1
IN2
PAD 4
(Pin 5)
PAD 6
(Pin 7)
PAD 5
(Pin 6)
PAD 2
(Pin 3)
200k
1
2
3
4
5
6
7
8
Figure 3. Pin layout SSO16
200k
Figure 4.
T4227
RF–Amp
Preliminary Information
15
14
13
12
10
16
11
9
AGC
from
n.c.
DEM
HLD
PK
PON
OUT1
OUT2
n.c.
RFO
In order to achieve a high selectivity, a crystal is
connected between the Pins RFO and RFI. It is used with
the serial resonant frequency of to the time-code
transmitter (e.g., 60 kHz WWVB, 77.5 kHz DCF or
40 kHz JJY) and acts as a serial resonator. The equivalent
parallel capacitor of the filter crystal is internally
compensated so that the bandwidth of the filter is about
10 Hz. The impedance of RFI is high. Parasitic loads have
to be prevented.
RFI
GND
GND
VCC
VCC
RFO
RFI
PAD 4
(Pin 5)
PAD 3
(Pin 4)
PAD 2
(Pin 3)
PAD 4
(Pin 5)
PAD 1
(Pin 2)
PAD 2
(Pin 3)
150k
250k
Figure 5.
Figure 6.
55k
T4227
3 (14)