U4224B Datasheet, PDF (2/17 Pages) TEMIC Semiconductors – Time Code Receiver

U4224B
Pin Description
Pin Symbol
SO 16 L
1
V_CC
2
IN
3
GND
4
SB
5
Q1A
6
Q1B
7
REC
8
INT
9
DEC
10
FLA
11
FLB
12
SL
13
Q2A
14
Q2B
15
PON
16
TCO
Function
Supply voltage
Amplifier – Input
Ground
Bandwidth control
Crystal filter 1
Crystal filter 1
Rectifier output
Integrator output
Decoder input
Low pass filter
Low pass filter
AGC hold mode
Crystal filter 2
Crystal filter 2
Power ON/OFF control
Time code output
V_CC ¹
IN 2
16 TCO
15 PON
GND ³
14 Q2B
SB ⁴
Q1A 5
U4224B
13 Q2A
12 SL
Q1B ⁶
11 FLB
REC 7
10 FLA
INT 8
9 DEC
93 7729 e
IN
SB
A ferrite antenna is connected between IN and V_CC. For
high sensitivity the Q of the antenna circuit should be as
high as possible, but a high Q often requires temperature
compensation of the resonant frequency. Specifications
W ^{are valid for Q > 30. An optimal signal to noise ratio will}
be achieved by a resonant resistance of 50 to 200 k .
A resistor R_SB is connected between SB and GND. It con-
trols the bandwidth of the crystal filters. It is
W recommended: R_SB = 0 for DCF 77.5 kHz, R_SB =
W 10 k for 60 kHz WWVB and R_SB = open for JG2AS
40 kHz.
94 8381
V_CC
SB
IN
GND
94 8379
2 (17)
TELEFUNKEN Semiconductors
Rev. A3, 02-Apr-96