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參數(shù)資料
| 型號： | T4223B-MF |
| 廠商： | ATMEL CORP |
| 元件分類： | 消費家電 |
| 英文描述： | Time-Code Receiver with A/D Converter |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, UUC22 |
| 封裝： | DIE-22 |
| 文件頁數(shù)： | 6/18頁 |
| 文件大小： | 138K |
| 代理商： | T4223B-MF |
U4223B
Rev. A7, 06-Mar-01
6 (18)
Temperature compensation of the resonant frequency is
a must if the clock is used at different temperatures.
Please ask your supplier of bar antenna material and of
capacitors for specified values of the temperature
coefficient.
Furthermore, some critical parasitics have to be consid-
ered. These are shortened loops (e.g., in the ground line
of the PCB board) close to the antenna and undesired
loops in the antenna circuit. Shortened loops decrease the
Q value of the circuit. They have the same effect like con-
ducting plates close to the antenna. To avoid undesired
loops in the antenna circuit, it is recommended to mount
the capacitor C
res
as close as possible to the antenna coil
or to use a twisted wire for the antenna-coil connection.
This twisted line is also necessary to reduce feedback of
noise from the microprocessor to the IC input. Long
connection lines must be shielded.
A final adjustment of the time-code receiver can be
carried out by pushing the coil along the bar antenna. The
maximum of the integrator output voltage V
INT
at
Pin INT indicates the resonant point. But attention: The
load current should not exceed 1 nA, that means an input
resistance
1 G of the measuring device is required.
Therefore, a special DVM or an isolation amplifier is
necessary.
Absolute Maximum Ratings
Parameters
Symbol
V
CC
T
amb
R
stg
T
j
±
V
ESD
Value
5.25
–40 to +85
–40 to +85
125
2000
Unit
V
C
C
C
V
Supply voltage
Ambient temperature range
Storage temperature range
Junction temperature
Electrostatic handling
(MIL Standard 883 D), except Pins 2, 5, 6, 14 and 15
Thermal Resistance
Parameters
Symbol
R
thJA
Maximum
70
Unit
K/W
Thermal resistance
Electrical Characteristics
V
CC
= 3 V, reference point Pin 3, input signal frequency 80 kHz, T
amb
= 25 C, unless otherwise specified
Parameters
Test Conditions / Pin
Symbol
V
CC
I
CC
Min
1.2
Typ
Max
5.25
Unit
V
Supply voltage range
Supply current
Pin 1
Pin 1
Without reception signal
with reception signal = 200 V
OFF mode
V
CC
= 1.5 V
15
30
25
0.1
A
A
A
s
Set-up time after V
CC
ON
AGC amplifier input; IN Pin 2
Reception frequency range
Minimum input voltage
Maximum input voltage
Input capacitance to GND
t
2
f
in
V
in
V
in
C
in
40
80
1.5
kHz
V
mV
pF
R
res
= 100 k , Q
res
> 30
1
40
80
1.5
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