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U4223B Schematic ( PDF Datasheet ) - ATMEL Corporation

Teilenummer U4223B
Beschreibung Time-Code Receiver with A/D Converter
Hersteller ATMEL Corporation
Logo ATMEL Corporation Logo 




Gesamt 18 Seiten
U4223B Datasheet, Funktion
Time-Code Receiver with A/D Converter
U4223B
Description
The U4223B is a bipolar integrated straight-through receiver circuit in the frequency range of 40 kHz to 80 kHz.
The device is designed for radio-controlled clock applications.
Features
D Very low power consumption
D Very high sensitivity
D High selectivity by using two crystal filters
D Power-down mode available
D Only a few external components necessary
D 4-bit digital output
D AGC hold mode
Block Diagram
PON CLK D3 D2 D1 D0
VCC 1
GND
3
IN 2
16
Power supply
12 17 18 19
ADC
AGC
amplifier
Impulse
circuit
4 5 6 14 15
SB Q1A Q1B Q2A Q2B
20 11 FLB
Decoder
10 FLA
9 DEC
Rectifier & 13
integrator
78
REC INT
SL
Figure 1. Block diagram
Ordering and Package Information
Extended Type Number
U4223B-MFS
U4223B-MFSG3
T4223B-MF
T4223B-MC
Package
SSO20 plastic
SSO20 plastic
No
No
Remarks
Taping according to IEC-286-3
Die on foil
Die on carrier
Rev. A7, 06-Mar-01
1 (18)






U4223B Datasheet, Funktion
U4223B
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 Cres 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 VINT at
Pin INT indicates the resonant point. But attention: The
load current should not exceed 1 nA, that means an input
resistance w 1 GW of the measuring device is required.
Therefore, a special DVM or an isolation amplifier is
necessary.
Absolute Maximum Ratings
Parameters
Supply voltage
Ambient temperature range
Storage temperature range
Junction temperature
Electrostatic handling
(MIL Standard 883 D), except Pins 2, 5, 6, 14 and 15
Symbol
VCC
Tamb
Rstg
Tj
± VESD
Value
5.25
–40 to +85
–40 to +85
125
2000
Unit
V
_C
_C
_C
V
Thermal Resistance
Parameters
Thermal resistance
Symbol
RthJA
Maximum
70
Unit
K/W
Electrical Characteristics
VCC = 3 V, reference point Pin 3, input signal frequency 80 kHz, Tamb = 25_C, unless otherwise specified
Parameters
Test Conditions / Pin
Symbol Min Typ Max Unit
Supply voltage range
Supply current
Pin 1
VCC 1.2
5.25 V
Pin 1
Without reception signal
ICC
30 mA
with reception signal = 200 mV
15 25 mA
OFF mode
0.1 mA
Set-up time after VCC ON VCC = 1.5 V
AGC amplifier input; IN Pin 2
t 2s
Reception frequency range
Minimum input voltage
Maximum input voltage
Input capacitance to GND
Rres = 100 kW, Qres > 30
fin 40
80 kHz
Vin 1 1.5 mV
Vin 40 80
mV
Cin 1.5 pF
6 (18)
Rev. A7, 06-Mar-01

6 Page









U4223B pdf, datenblatt
U4223B
PAD Coordinates
The T4223B is also available as die for “chip-on-board” mounting.
DIE size: 2.26 x 2.09 mm
PAD size: 100 x 100 mm (contact window 88 x 88 mm)
Thickness: 300 mm " 20 mm
SYMBOL
IN1
IN
GND
SB
Q1A
Q1B
REC
INT
DEC
FLA
FLB
X-Axis/mm
128
128
354
698
1040
1290
1528
1766
2044
2044
2044
Y-Axis/mm
832
310
124
128
128
128
128
128
268
676
1072
SYMBOL
CLK
SL
Q2A
Q2B
PON
TCO
D3
D2
D1
D0
VCC
The PAD coordinates are referred to the left bottom point
of the contact window.
PAD Layout
X-Axis/mm
2044
2044
2000
1634
1322
1008
696
384
128
128
128
Y-Axis/mm
1400
1638
1876
1876
1876
1876
1876
1876
1682
1454
1138
D2
D1
D0
D3
TCO
PON
Q2B
Q2A
SL
CLK
VCC
T4223B
FLB
IN1
FLA
12 (18)
Y Axis
IN
GND
SB
Q1A
Q1B REC
DEC
INT
X Axis
Reference point (%)
Figure 23.
94 8892
Rev. A7, 06-Mar-01

12 Page





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