U4283BM
AM / FM - PLL
Description
The U4283BM is an integrated circuit in BICMOS
technology for frequency synthesizer. It performs all the
functions of a PLL radio tuning system and is controlled
by I
2
C bus. The device is designed for all frequency
synthesizer applications of radio receivers, as well as
RDS (Radio
Data System)
applications.
Features
D
Reference oscillator up to 15 MHz
D
Two programmable 16 bit dividers
adjustable from 2 to 65535
D
Three programmable switching outputs
(open drain up to 20 V)
D
Fine tuning steps:
AM
FM
y
1 kHz
y
2 kHz
D
Few external component requirements due
to integrated loop-transistor for AM/FM
D
High signal/ noise ratio
Block Diagram
PRT SWO1 SWO2 SWO3
OSCIN
OSCOUT
18
Oscillator
19
2
3
4
Latch
I
2
C–BUS
Interface
Shift register
AM/FM
9
5
R-Divider
6
7
8
Switching outputs
Latch
Status
14
Phase
detector
Current
sources
15
13
PDFM
PDAM
PDFMO
PDAMO
LD
SCL
SDA
AS
Latch
10
Preamplifier
:2
FMOSC
12
Preamplifier
AM/FM
switch
AMOSC
N–Divider
Analogue
outputs 16
Lock
detector
17
11
GND 2
1
VDD
Figure 1.
20
GND 1
94 8054 e
Ordering and Package Information
Extended Type Number
U4283BM-BFL
U4283BM-BFLG3
U4283BM-BFS
Package
SO20 plastic
SO20 plastic
SSO20 plastic
Remarks
Taping according to IEC-286-3
TELEFUNKEN Semiconductors
Rev. A1, 15-May-96
1 (9)
Preliminary Information
U4283BM
Pin Description
V
DD
SCL
1
2
3
4
5
20
19
18
17
16
GND1
OSCOUT
OSCIN
LD
PDAMO
PDAM
PDFM
PDFMO
AMOSC
GND2
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Symbol
V
DD
SCL
SDA
AS
PRT
SWO 1
SWO 2
SWO3
AM/FM
FMOSC
GND 2
AMOSC
PDFMO
PDFM
PDAM
PDAMO
LD
OSCIN
OSCOUT
GND 1
Function
Supply voltage
I
2
C bus clock
I
2
C bus data
Address selection
Switching port
Switching output 1
Switching output 2
Switching output 3
Switching output AM/FM
FM oscillator input
Ground 2 (analogue)
AM oscillator input
FM analogue output
FM current output
AM current output
AM analogue output
Lock detector
Oscillator input
Oscillator output
Ground 1 (digital)
SDA
AS
PRT
SWO 1
SWO 2
SWO 3
AM/FM
FMOSC
U4283BM
6
7
8
9
10
94 8055 e
15
14
13
12
11
Functional Description
The U4283BM is controlled via the 2-wire I
2
C bus. For
programming there are one module address byte, two
subaddress bytes and five data bytes.
The module address contains a programmable address bit
A 1 which with address select input AS (Pin 4) makes it
possible to operate two U4283BM-B in one system. If bit
A 1 is identical with the status of the address select input
AS, the chip is selected.
The subaddress determines which one of the data bytes is
transmitted first. If subaddress of R-divider is
transmitted, the sequence of the next data bytes is DB 0
(Status), DB 1 and DB 2.
If subaddress of N-divider is transmitted, the sequence of
the next data bytes is DB 3 and DB 4. The bit organisation
of the module address, subaddress and 5 data bytes are
shown in figure 2
Each transmission on the I
2
C bus begins with the
“START ”-condition and has to be ended by the “STOP”-
condition (see figure 3).
The integrated circuit U 4283 BM has two separate inputs
for AM and FM oscillator. Pre-amplified AM signal is
directed to the 16 bit N-divider via AM/FM switch,
whereas (pre-amplified) FM signal is first divided by a
fixed prescaler ( :2 ). AM/FM switch is controlled by
software. Tuning steps can be selected by 16 bit
R-divider. Further there is a digital memory phase
detector. There are two separate current sources for AM
and FM amplifier (charge pump) as given in electrical
characteristics. It allows independent adjustment of gain,
whereby providing high current for high speed tuning and
low current for stable tuning.
2 (9)
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 15-May-96
U4283BM
Transmission Protocol
S
MSB
LSB
Address
A7
A0
A
Subaddress
R-divider
A
Data 0
A
Data 1
A
Data 2
A
P
S
MSB
LSB
Address
A7
A0
A
Subaddress
N-divider
A
Data 3
A
Data 4
A
A
P
S = Start
P = Stop
A = Acknowledge
Figure 3.
Absolute Maximum Ratings
Parameters
Supply voltage
Pin 1
Input voltage
Pins 2, 3, 4, 10, 12, 18 and 19
Output current
Pins 3, 5, 6, 7, 8 and 9
Output drain voltage
Pins 6, 7, 8 and 9
Output voltage
Pins 13 and 16
Output current
Pins 13 and 16
Ambient temperature range
Storage temperature range
Junction temperature
Electrostatic handling (MIL Standard 883C)
Symbol
V
DD
V
I
I
O
V
OD
V
AO
I
AO
T
amb
T
stg
T
j
V
ESD
Value
–0.3 to +6
–0.3 to V
DD
+0.3
–1 to +5
20
15
–1 to +20
–25 to +85
–40 to +125
125
2000
Unit
V
V
mA
V
V
mA
_
C
_
C
_
C
V
"
Thermal Resistance
Parameters
Junction ambient
Symbol
R
thJA
Value
160
Unit
K/W
4 (9)
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 15-May-96
U4283BM
Electrical Characteristics
V
DD
= 5 V, T
amb
= 25°C, unless otherwise specified.
Parameters
Test Conditions / Pins
Symbol
Min.
Supply voltage
Pin 1
V
DD
4.5
Quiescent supply current
Pin 1
I
DD
FM input sensitivity, R
G
= 50
W
FMOSC
f
i
= 70 to 120 MHz
Pin 10
V
SFM
25
f
i
= 120 to 130 MHz
Pin 10
V
SFM
50
AM input sensitivity, R
G
= 50
W
AMOSC
f
i
= 0.5 to 35 MHz
Pin 12
V
SAM
25
Oscillator input sensitivity, R
G
= 50
W
OSCIN
f
i
= 0.1 to 15 MHz
Pin 14 V
SOSC
100
Switching output SWO 1, SWO 2, SWO3, AM/FM (open drain)
Output voltage
Pins 6, 7, 8 and 9
V
SWOL
LOW
I
L
= 1 mA
V
SWOL
I
L
= 0.1 mA
LOW
Pins 6, 7, 8 and 9
Output leakage current
I
OHL
V5, V6 = 20 V
HIGH
Lock detector output (open drain)
Output voltage
I = 3 mA
LOW
Switching output PRT
Pin 5
Output voltage
I
L
= 1 mA
V
OH
V
DD
–0.4
HIGH
V
OL
I
L
= 1 mA
LOW
V
OL
I
L
= 0.1 mA
LOW
Phase detector PDFM
Output current 1
Pin 14
I
PDFM
400
I
PDFM
Output current 2
Pin 14
100
Phase detector PDAM
Output current 1
Pin 15
I
PDAM
75
I
PDAM
Output current 2
Pin 15
20
Analogue output PDFMO, PDAMO
Saturation voltage
I = 15 mA
V
sat
Pins 13 and 16
Leakage current
Pins 13 and 16
I
LEAK
I
2
C bus SCL, SDA, AS
Input voltage
Pins 2, 3 and 4
V
iBUS
3.0
HIGH
0
LOW
Output voltage
I
SDA
= 3 mA
Pin 3
V
O
Acknowledge LOW
Clock frequency
Pin 2
f
SCL
Rise time SDA, SCL
Pins 2 and 3
t
r
Typ.
5.0
6.0
Max.
5.5
11.6
Unit
V
mA
mV
mV
mV
mV
200
20
400
100
100
mV
mV
nA
0.4
V
0.4
0.1
500
125
100
25
600
150
125
30
V
V
V
"
"
"
"
m
A
m
A
m
A
m
A
mV
m
A
270
400
1
V
DD
1.5
V
V
V
kHz
m
s
0.4
100
1
TELEFUNKEN Semiconductors
Rev. A1, 15-May-96
5 (9)
Preliminary Information
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