TEMIC U4285BM

U4285BM
AM / FM - PLL
Description
The U4285BM is an integrated circuit in BICMOS
technology for frequency synthesizers. It performs all the
functions of a PLL radio tuning system and is controlled
by an I2C bus. The device is designed for all frequency
synthesizer applications in radio receivers, as well as
RDS ( Radio Data System ) applications.
Features
D Reference oscillator up to 15 MHz
D Two programmable 16 bit dividers
D 4 programmable switching outputs
(open drain up to 15 V)
adjustable from 2 to 65535
D Few external component required due to
D Fine tuning steps:
AM
FM
y 1 kHz
y 2 kHz
integrated loop-push-pull stage for AM/FM
D High signal/ noise ratio
Ordering Information
Extended Type Number
U4285BM-AFS
U4285BM-AFSG3
Package
Remarks
SSO20 plastic
SSO20 plastic
Taping according to IEC-286-3
Block Diagram
SWO1 SWO2 SWO3 SWO4
5
6
7
8
OSCIN 18
Oscillator
R-divider
Switching outputs
OSCOUT
14
19
SCL
SDA 3
AS
FMOSC
PDAM
2
15
I2C bus
interface
16
4
Phase
detector
9
AMOSC 11
AM/FM
switch
10
GND2
Current
sources
17
12
13
N-divider
1
VDD
20
GND1
PDAMO
VA
C
PDFMO
PDFM
95 10120
Figure 1.
TELEFUNKEN Semiconductors
Rev. A3, 14-May-97
1 (10)
U4285BM
Pin Description
VDD
1
20
GND1
SCL
2
19
OSCOUT
SDA
3
18
OSCIN
AS
4
17
C
SWO 1
5
16
VA
U4285BM
SWO 2
6
15
PDAMO
SWO3
7
14
PDAM
SWO4
8
13
PDFM
FMOSC
9
12
PDFMO
GND 2
10
11
AMOSC
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Symbol
VDD
SCL
SDA
AS
SWO 1
SWO 2
SWO3
SWO4
FMOSC
GND 2
AMOSC
PDFMO
PDFM
PDAM
PDAMO
VA
C
OSCIN
OSCOUT
GND1
Function
Supply voltage
I2C bus clock
I2C bus data
Address selection
Switching output 1
Switching output 2
Switching output 3
Switching output 4
FM oscillator input
Ground 2 (analog)
AM oscillator input
FM analogue output
FM current output
AM current output
AM analogue output
Analogue supply voltage
Capacitor
Oscillator input
Oscillator output
Ground 1 (digital)
95 10121
Functional Description
The U4285BM is controlled via the 2-wire I2C 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 U4285BM 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
2 (10)
of the module address, subaddress and 5 data bytes are
shown in figure 2.
Each transmission on the I2C bus begins with the
“START”- condition and has to be ended by the “STOP”condition (see figure 3).
The integrated circuit U4285BM has two separate inputs
for AM and FM oscillator. Pre-amplified AM and FM
signals are fed to the 16 bit N-divider via AM/FM switch.
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 characterisitics. It allows independent adjustment of gain, whereby providing high current
for high speed tuning and low current for stable tuning.
TELEFUNKEN Semiconductors
Rev. A3, 14-May-97
U4285BM
Bit Organization
MSB
1
1
0
0
1
0
0/1
LSB
0
A7
A6
A5
A4
A3
A2
A1
A0
Subaddress (R-divider)
X
X
X
0
0
1
X
X
Subaddress (N-divider)
X
X
X
X
1
1
X
X
MSB
SWO1
SWO2
SWO3
SWO4
D7
D6
D5
D4
AM/
FM
D3
PD
ANA
D2
PD
POL
D1
LSB
PD
CUR
D0
Module address
Data byte 0 (Status)
Data byte 1
215
R-divider
28
Data byte 2
27
R-divider
20
Data byte 3
215
N-divider
28
Data byte 4
27
N-divider
20
AM/FM
PD – ANA
PD – POL
PD – CUR
LOW
FM-operation
PD analog
Negative polarity
Output current 2
HIGH
AM-operation
TEST
Positive polarity
Output current 1
Figure 2.
TELEFUNKEN Semiconductors
Rev. A3, 14-May-97
3 (10)
U4285BM
Transmission Protocol
MSB
S
LSB
Address
A7
A0
MSB
LSB
S
Address
A7
S = Start
A
Subaddress
R-divider
A
Data 0
A
Data 1
A
A
Subaddress
N–divider
A
Data 3
A
Data 4
A
A
A0
P = Stop
Data 2
A
P
P
A = Acknowledge
Figure 3.
Absolute Maximum Ratings
Parameters
Supply voltage
Pin 1
Input voltage
Pins 2, 3, 4, 9, 11, 18 and 19
Output current
Pins 3, 5, 6, 7 and 8
Output drain voltage
Pins 5, 6, 7 and 8
Analogue supply voltage
Pin 16
with 220 W seriell resistance 2 minutes 1
Output current
Pins 12 and 15
Ambient temperature range
Storage temperature range
Junction temperature
Electrostatic handling (modified MIL STD 883 D
method 3015.7: all supply pins connected together)
1
Symbol
VDD
VI
IO
VOD
VA
VA
IAO
Tamb
Tstg
Tj
VESD
Value
–0.3 to +6
–0.3 to VDD + 0.3
–1 to +5
15
6 to 15
24
–1 to +20
–30 to +85
–40 to +125
125
1000
Unit
V
V
mA
V
V
V
mA
_C
_C
_C
V
Symbol
RthJA
Value
160
Unit
K/W
"
corresponding our application circuit (page 8)
Thermal Resistance
Parameters
Junction ambient
4 (10)
TELEFUNKEN Semiconductors
Rev. A3, 14-May-97
U4285BM
Electrical Characteristics
VDD = 5 V, VA = 10 V, Tamb = 25°C, unless otherwise specified
Parameters
Supply voltage
Quiescent supply current
Test conditions / Pin
Symbol
Pin 1
VDD
AM-mode
Pin 1
IDD
FM-mode
FM input sensitivity, RG = 50 W FMOSC
fi = 70 to 120 MHz
Pin 9
VSFM
fi = 160 MHz
Pin 9
VSFM
AM input sensitivity, RG = 50 W AMOSC
fi = 0.6 to 35 MHz
Pin 11
VSAM
Oscillator input sensitivity, RG = 50 W OSCIN
fi = 0.1 to 15 MHz
Pin 18 VSOSC
Switching output SWO 1, SWO 2, SWO 3, SWO 4 (open drain)
Output voltage
Pins 5, 6, 7 and 8
LOW
IL = 1 mA
VSWOL
Output leakage current
Pins 5, 6, 7 and 8
HIGH
V5, V6, V7, V8 = 10 V
IOHL
Phase detector PDFM
Output current 1
Pin 13
IPDFM
Output current 2
Pin 13
IPDFM
Leakage current
Pin 13
IPDFML
Phase detector PDAM
Output current 1
Pin 14
IPDAM
Output current 2
Pin 14
IPDAM
Leakage current
Pin 14
IPDAM-
"
"
"
"
"
"
Min.
4.5
Typ.
5.0
4.0
4.0
Max.
5.5
7.0
7.0
Unit
V
mA
40
150
mVrms
mVrms
40
mVrms
100
mVrms
100
1600
400
160
40
2000
500
200
50
400
mV
100
nA
2400
600
20
240
60
20
mA
mA
nA
mA
mA
nA
L
Analogue output PDFMO, PDAMO
Saturation voltage
Pins 12 and 15
LOW
I = 15 mA
HIGH
I2C bus SCL, SDA, AS
Input voltage
Pins 2, 3 and 4
HIGH
LOW
Output voltage
Pin 3
Acknowledge LOW
ISDA = 3 mA
Clock frequency
Pin 2
Rise time SDA, SCL
Pins 2 and 3
Fall time SDA, SCL
Pins 2 and 3
Period of SCL
Pin 2
HIGH
HIGH
LOW
LOW
TELEFUNKEN Semiconductors
Rev. A3, 14-May-97
VsatL
VsatH
9.5
200
9.95
400
mV
V
VDD
1.5
V
V
0.4
100
1
300
V
kHz
ms
ns
ViBUS
3.0
0
VO
fSCL
tr
tf
tH
tL
4.0
4.7
ms
ms
5 (10)
U4285BM
Parameters
Setup time
Start condition
Data
Stop condition
Time space 1)
Hold time
Start condition
DATA
1)
Test conditions / Pin
Symbol
Min.
Typ.
Max.
Unit
tsSTA
tsDAT
tsSTOP
twSTA
4.7
250
4.7
4.7
ms
thSTA
thDAT
4.0
0
ms
ms
ns
ms
ms
This is a space of time where the bus must be free from data transmission and before a new transmission can be started
Bus Timing
SDA
twSTA
tr
tf
thSTA
SCL
S thSTA
P
thDAT
tL
tH
tsSTA
tsSTOP
thDAT
P = Stop, S = Start
P
95 10122
Figure 4.
14
12
14
T = 85°C
12
VDD =
5.5 V
5.0 V
4.5 V
8
6
6
4
2
2
40
60
80
fiFM ( MHz )
100
0
20
120
VDD =
5.5 V
5.0 V
4.5 V
8
4
0
20
13354
10
VSFM ( mV )
VSFM ( mV )
10
T = –30°C
13355
40
60
80
100
120
fiFM ( MHz )
Figure 5. FM input sensitivity
6 (10)
TELEFUNKEN Semiconductors
Rev. A3, 14-May-97
U4285BM
100
100
10
T = –30°C
VDD =
5.5 V
5.0 V
4.5 V
V SAM ( mV )
V SAM ( mV )
T = 85°C
1
0.1
1.0
10.0
10
1
0.1
100.0
fiAM ( MHz )
13353
VDD =
5.5 V
5.0 V
4.5 V
1.0
10.0
100.0
fiAM ( MHz )
13356
Figure 6. AM input sensitivity
Application Circuit
100 m
16 V
6 to 15 V 110
110
3k
100 n
C1
*
27 p
100 m
6.3 V
27 p
20
18
19
17
C3
C5
16
15
AMOSC
*
R2*
C2
*
R1
*
4 MHz
C6*
FMOSC
2.2 n
14
13
12
11
7
8
9
10
U4285BM
100 n
1
C4
3
2
4
5
6
100 m
6.3 V
1n
27
12 k
12 k
* Values depend on the step
frequency and used varicaps
5V
95 10123
Figure 7.
TELEFUNKEN Semiconductors
Rev. A3, 14-May-97
7 (10)
U4285BM
Recommendations for Applications
D C3 = 100 nF should be very close to Pin 1 (VDD) and
D 4 MHz crystal must be very close to Pin 18 and Pin 19
D Components of the charge pump (C1/R1 for AM and
Pin 20 (GND 1)
C2/R2 for FM) should be very close to Pin 14 with
respect to Pin 13.
D GND 2 (Pin 10 – analogue ground) and GND 1
(Pin 20 – digital ground) must be connected according
to figure 8
PCB-Layout
GND
C4
VDD
C2
C1
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
C3
95 10124
Figure 8.
8 (10)
TELEFUNKEN Semiconductors
Rev. A3, 14-May-97
U4285BM
Package Information
Package SSO20
5.7
5.3
Dimensions in mm
6.75
6.50
4.5
4.3
1.30
0.15
0.15
0.05
0.25
6.6
6.3
0.65
5.85
20
11
technical drawings
according to DIN
specifications
13007
1
TELEFUNKEN Semiconductors
Rev. A3, 14-May-97
10
9 (10)
U4285BM
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances ( ODSs).
The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and
forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban
on these substances.
TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of
continuous improvements to eliminate the use of ODSs listed in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively
2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency ( EPA) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively.
TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain
such substances.
We reserve the right to make changes to improve technical design and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer
application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized
application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of,
directly or indirectly, any claim of personal damage, injury or death associated with such unintended or
unauthorized use.
TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
10 (10)
TELEFUNKEN Semiconductors
Rev. A3, 14-May-97