U4223B ATMEL Corporation, U4223B Datasheet - Page 2

• Manufacturer Part Number: U4223B
• Description: Time-code Receiver With A/d Converter
• Manufacturer: ATMEL Corporation

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