U4289BM Datasheet by Microchip Technology

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I V A1—lnEL A IIIEI.
Rev. 4757A–AUDR–10/03
Features
Reference Oscillator up to 15 MHz
Two Programmable 16-bit Dividers Adjustable from 2 to 65535
Fine Tuning Steps
–AM 1 kHz
–FM 2 kHz
Loop-push-pull Stage for AM/FM
High Signal/Noise Ratio
Description
The U4289BM is an integrated circuit in BICMOS technology for frequency synthesiz-
ers. It performs all the functions of a PLL radio tuning system and is controlled by a
2-wire bus. The device is designed for all frequency synthesizer applications in radio
receivers, as well as for RDS (Radio Data System) applications.
Figure 1. Block Diagram
R-divider
N-divider
I2C bus
interface
Oscillator
Phase
Current
sources
AM/FM
14
15
2
3
4
6
8
OSCOUT
OSCIN
SCL
AS
FMOSC
AMOSC
SDA
5
7116
SWO1
11
12
13
9
10
PDAM
PDAMO
VA
PDFMO
PDFM
GND2 GND1
DD
V
switch
Switching
output
detector
AM/FM PLL
with 1 Switch
U4289BM
41m
2U4289BM
4757A–AUDR–10/03
Pin Configuration
Figure 2. Pinning SO16
1
2
3
4
5
6
7
8
13
14
15
16
SCL
SDA
AS
SWO1
GND1
OSCOUT
OSCIN
VA
PDAMO
PDAM
PDFM
VDD
9
11
12
FMOSC
GND 2 PDFMO
AMOSC
10
Pin Description
Pin Symbol Function
1V
DD Supply voltage
2SCLBus clock
3SDABus data
4 AS Address selection
5 SWO1 Switching output
6 FMOSC FM oscillator input
7 GND2 Ground 2 (analog)
8 AMOSC AM oscillator input
9 PDFM FM current output
10 PDFMO FM analog output
11 PDAM AM current output
12 PDAMO AM analog output
13 VA Analog supply voltage
14 OSCIN Oscillator input
15 OSCOUT Oscillator output
16 GND1 Ground 1 (digital)
41m
3
U4289BM
4757A–AUDR–10/03
Functional
Description
The U4289BM is controlled via the 2-wire bus. One module address byte, two subad-
dress bytes and five data bytes enable programming.
The module address contains a programmable address bit A 1, which (along with
address select input AS, pin 4), enables the operation of two U4289BM devices 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 of the data bytes is transmitted first. If the subad-
dress of the R-divider is transmitted, the sequence of the next data bytes is DB 0
(Status), DB 1 and DB 2. If the subaddress of the N-divider is transmitted, the sequence
of the next data bytes is DB 3 and DB 4. The bit organization of the module address,
subaddress and 5 data bytes is shown in table “Bit Organization” on page 7.
Each transmission on the bus begins with the “START” condition and has to be ended
by the “STOP” condition (see table “Transmission Protocol” on page 7).
The integrated circuit U4289BM has two separate inputs for the AM and FM oscillators.
Pre-amplified AM and FM signals are fed to the 16-bit R-divider via the AM/FM switch.
The AM/FM switch is software controlled. Tuning steps can be selected by the 16-bit
R-divider.
Furthermore, the device provides a digital memory phase detector and two separate
current sources for AM and FM amplifier (charge pump) as given in the Table “Electrical
Characteristics” on page 4. It allows independent gain adjustment, providing high cur-
rent for high-speed tuning and low current for stable tuning.
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameters Pins Symbol Value Unit
Supply voltage 1 VDD -0.3 to +6 V
Input voltage 2, 3, 4, 6, 8, 14,
15 VI-0.3 to VDD +0.3 V
Output current 3, 5 IO-1 to +5 mA
Output drain voltage 5 VOD 15 V
Analog supply voltage with 220 serial
resistance 2 minutes(1) 13 VA
VA
6 to 15
24
V
V
Output current 9, 12 IAO -1 to +20 mA
Ambient temperature range Tamb -30 to +85 °C
Storage temperature range Tstg -40 to +125 °C
Junction temperature Tj125 °C
Electrostatic handling
(modified MIL STD 883 D method 3015.7: all
supply pins connected together)
±VESD 1000 V
Note: 1. Corresponding to the application circuit (Figure 8 on page 8)
Thermal Resistance
Parameters Symbol Value Unit
Junction ambient RthJA 160 K/W
41m
4U4289BM
4757A–AUDR–10/03
Electrical Characteristics
VDD = 5 V, VA = 10 V, Tamb = 25°C, unless otherwise specified
Parameters Test Conditions Pins Symbol Min. Typ. Max. Unit
Supply voltage 1 VDD 4.5 5.0 5.5 V
Quiescent supply current AM mode/FM mode 1 IDD 4.0 7.0 mA
FM input sensitivity,
RG = 50 , FMOSC
fi = 70 to 120 MHz 6 VSFM 40 mVrms
fi = 160 MHz 6 VSFM 150 mVrms
AM input sensitivity,
RG = 50 , AMOSC fi = 0.6 to 35 MHz 8 VSAM 40 mVrms
Oscillator input sensitivity,
RG = 50 , OSCIN fi = 0.1 to 15 MHz 14 VSOSC 100 mVrms
Phase Detector PDFM
Output current 1 10 ±IPDFM 1600 2000 2400 µA
Output current 2 10 ±IPDFM 400 500 600 µA
Leakage current 10 ±IPDFML 20 nA
Phase Detector PDAM
Output current 1 11 ±IPDAM 160 200 240 µA
Output current 2 11 ±IPDAM 40 50 60 µA
Leakage current 11 ±IPDAML 20 µA
Analog Output PDFMO, PDAMO
Saturation voltage LOW I = 15 mA 9, 12 VsatL 200 400 mW
Saturation voltage HIGH I = 15 mA 9, 12 VsatH 9.5 9.95 V
Bus SCL, SDA, AS
Input voltage HIGH 2, 3, 4 ViBUS 3.0 VDD V
Input voltage LOW 2, 3, 4 ViBUS 01.5V
Output voltage acknowledge LOW ISDA = 3 mA 3 VO0.4 V
Clock frequency 2 fSCL 100 kHz
Rise time SDA, SCL 2, 3 trs
Fall time SDA, SCL 2, 3 tf300 ns
Period of SCL HIGH 2 tH4.0 µs
Period of SCL LOW 2 tL4.7 µs
41m
5
U4289BM
4757A–AUDR–10/03
Note: 1. This is a period of time where the bus must be free from data transmission before a new transmission can be started.
Figure 3. FM Input Sensitivity, Tamb = +85°C
Figure 4. FM Input Sensitivity, Tamb = -30°C
Set-up Time
Start condition tsSTA 4.7 µs
Data tsDAT 250 µs
Stop condition tsSTOP 4.7 µs
Time space(1) twSTA 4.7 µs
Hold Time
Start condition thSTA 4.0 µs
DATA thDAT s
Electrical Characteristics (Continued)
VDD = 5 V, VA = 10 V, Tamb = 25°C, unless otherwise specified
Parameters Test Conditions Pins Symbol Min. Typ. Max. Unit
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
20.0 60.0 100.0
fiFM (MHz)
V
SFM
(mA)
T = 85°C
VDD =
5.5 V
5.0 V
4.5 V
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
20.0 60.0 100.0
fiFM (MHz)
V
SFM
(mA)
T = -30°C
VDD =
5.5 V
5.0 V
4.5 V
41m
6U4289BM
4757A–AUDR–10/03
Figure 5. AM Input Sensitivity, Tamb = +85°C
Figure 6. AM Input Sensitivity, Tamb = -30°C
Figure 7. Bus Timing
1.0
10.0
100.0
0 1 10 100
VDD (V)
f
SYSCLK
(kHz)
T = 85°C
VDD =
5.5 V
5.0 V
4.5 V
1.0
10.0
100.0
0110100
VDD (V)
f
SYSCLK
(kHz)
T = -30°C
VDD =
5.5 V
5.0 V
4.5 V
twSTA
PS
thSTA tL
tr
SDA
SCL
thDAT P
thSTA
tf
tHtsSTA tsSTOP
P = Stop,
S = Start
thDAT
41m
7
U4289BM
4757A–AUDR–10/03
Bit Organization
Table 1. Function Mode
Transmission Protocol
Note: S = Start, P = Stop, A = Acknowledge
MSB LSB
Module address 1 1 0 0 1 0 0/1 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
Data byte 0 (Status) SWO1 AM/FM PD - ANA PD - POL PD - CUR
D7 D6 D5 D4 D3 D2 D1 D0
Data byte 1 215 R-divider 28
Data byte 2 27R-divider 20
Data byte 3 215 N-divider 28
Data byte 4 27N-divider 20
Bit Description Mode LOW HIGH
D3 AM/FM FM operation AM operation
D2 PD - ANA PD analog TEST
D1 PD - POL Negative polarity Positive polarity
D0 PD - CUR Output current 2 Output current 1
MSB LSB
SAddress ASubaddress AData 0 AData 1 AData 2 A P
A0 A7 R-divider
MSB LSB
S Address A Subaddress A Data 3 A Data 4 A P
A0 A7 N-divider
2/[393 // "T"? |J|J[J/[J[J[J[J
8U4289BM
4757A–AUDR–10/03
Figure 8. Application Circuit
Recommendations
for Applications
•C
3 = 100 nF should be very close to pin 1 (VDD) and pin 16 (GND 1)
GND2 (pin 7, analog ground) and GND1 (pin 16, digital around) must be connected
according to Figure 8
4 MHz crystal must be very close to pin 14 and pin 15
Components of the charge pump (C1/R1 for AM and C2/R2 for FM) should be very
close to pin 11 with respect to pin 10.
Figure 9. PCB Layout
16
1234
U4289BM
5678
15 14 13 12 11 10 9
4 MHz
27 pF 27 pF
AMOSC
FMOSC
12k12k
5V
100 nF
6 to 15 V 110 110
100 µF
16 V
C1*) C5*)
R1*)
R2*)
C2*)
3 kC6*)
C3
100 µF
6.3 V
27
C4
2.2 nF
100 nF
1 nF
*) Values depend on the step
frequency and used varicaps
16
12345678
15 14 13 12 11 10 9
C1
C3
C4
VDD
GND C2
A1—lnEL
9
U4289BM
4757A–AUDR–10/03
Package Information
Ordering Information
Extended Type Number Package Remarks
U4289BM-MFP SO16 plastic
U4289BM-MFPG3 SO16 plastic Taping according to IEC-286-3
technical drawings
according to DIN
specifications
Package SO16
Dimensions in mm 10.0
9.85
8.89
0.4
1.27
1.4
0.25
0.10
5.2
4.8
3.7
3.8
6.15
5.85
0.2
16 9
18
.11_mEL®
Printed on recycled paper.
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