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U4223B-MFS Datasheet(PDF) 2 Page - ATMEL Corporation

Part # U4223B-MFS
Description  Time-Code Receiver with A/D Converter
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

U4223B-MFS Datasheet(HTML) 2 Page - ATMEL Corporation

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U4223B
Rev. A7, 06-Mar-01
2 (18)
Pin Description
3
4
5
13
14
15
16
17
18
19
20
2
1
6
7
8
9
10
12
11
VCC
IN
GND
SB
DEC
D0 (LSB)
D1
D2
D3 (MSB)
PON
CLK
U4223B
Q1A
Q1B
REC
INT
FLA
Q2B
Q2A
SL
FLB
Figure 2. Pinning
Pin
Symbol
Function
1
VCC
Supply voltage
2
IN
Amplifier – Input
3
GND
Ground
4
SB
Bandwidth control
5
Q1A
Crystal filter 1
6
Q1B
Crystal filter 1
7
REC
Rectifier output
8
INT
Integrator output
9
DEC
Decoder input
10
FLA
Lowpass filter
11
FLB
Lowpass filter
12
CLK
Clock input for ADC
13
SL
AGC hold mode
14
Q2A
Crystal filter 2
15
Q2B
Crystal filter 2
16
PON
Power ON/OFF control
17
D3
Data out MSB
18
D2
Data out
19
D1
Data out
20
D0
Data out LSB
IN
A ferrite antenna is connected between IN and VCC. 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. Specifications are valid for
Q>30. An optimal signal-to-noise ratio will be achieved
by a resonant resistance of 50 to 200 k
W.
IN
VCC
Figure 3.
SB
A resistor RSB is connected between SB and GND. It
controls the bandwidth of the crystal filters. It is recom-
mended: RSB = 0
W for DCF 77.5 kHz, RSB = 10 kW for
60 kHz WWVB and RSB = open for JG2AS 40 kHz.
SB
GND
Figure 4.


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