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INTEGRATED CIRCUITS
DATA SHEET
OM5610 Matchbox global FM tuner
Preliminary specification Supersedes data of 1997 Feb 07 File under Integrated Circuits, IC01 1997 Apr 25
Philips Semiconductors
Preliminary specification
Matchbox global FM tuner
FEATURES * Local/DX switching to improve large signal handling on FM when an outdoor antenna or cable network is connected * MPX-RDS signal available * The module meets the "FCC regulations" * Small size. GENERAL DESCRIPTION The OM5610 is a global FM-radio tuner (except Japan) which includes a brand new concept in tuning techniques. The new tuning concept combines the advantages of hand tuning together with electronic facilities and features. TOP VIEW ORDERING INFORMATION UNIT OM5610 FREQUENCY (MHz) 87.5 to 108
OM5610
BUS 3-wire bus
handbook, full pagewidth
RF ground
1 RF input 3 5 7 9 11
2 4 6 8 10 12
MBH887
Fig.1 OM5610 connectors.
1997 Apr 25
2
Philips Semiconductors
Preliminary specification
Matchbox global FM tuner
PINNING PIN 1 2 3 4 5 6 7 8 9 10 11 12 ground ground WREN CLCK STEREO DATA supply voltage (+5 V) supply voltage (+12 V) audio right output ground audio left output MPX-RDS DESCRIPTION PRESET OPERATION
OM5610
In preset mode, the microcontroller has to load information such as frequency band, frequency and mono/stereo. This information has to be sent via the bus to the tuner. The internal algorithm controls the tuning sequence as follows: 1. The information is loaded into a shift register, a last-station memory and the counter. 2. The Automatic Frequency Control (AFC) is switched-off. 3. The counter starts counting the frequency and the tuning voltage is varied until the real frequency roughly equals the desired frequency. 4. The AFC is then switched on and the real frequency is more precisely tuned to the actual IF frequency. 5. After the AFC has tuned the real frequency to the desired frequency an in-lock signal is generated; then the counter is switched off. In order to get a reliable in-lock signal, there are two parameters measured: the field strength and the S-curve. 6. The field strength indicates the strength of the station and by looking at the S-curve the system can detect an in-lock situation. In the event of fading or pulling the in-lock signal becomes logic 0 and the synthesizer will be switched on again (maintaining last station) and the algorithm will be repeated. SEARCH OPERATION During a search operation, the only action the microcontroller has to take is: sending the desired band plus the direction and the search sensitivity level to the tuner. The search operation is performed by the charge pump until an in-lock signal is generated (combination of measuring the field strength and the S-curve). By looking at the S-curve the system can distinguish false in-locks from real in-locks (false in-locks occur on the wrong slope of the S-curve). The AFC then fine tunes to the station. The frequency of the found station will be counted by the counter and written into the last-station memory and the shift register of the counter. At this time the frequency is available in the shift register and can be read by the microcontroller. The microcontroller decides whether the frequency is within the desired frequency band. If so, this frequency can be stored under a preset and if not, a new search action should be started.
FUNCTIONAL DESCRIPTION The OM5610 is an integrated FM stereo radio circuit including digital tuning and control functions. The radio The radio circuit incorporates a tuned RF stage, a double balanced mixer, a one-pin oscillator and is designed for distributed IF ceramic filters. The FM quadrature detector uses a ceramic resonator. The PLL stereo decoder incorporates a signal dependent stereo-blend circuit and a soft-mute circuit. Tuning The tuning-concept of Self Tuned Radio (STR) is based on FUZZY LOGIC: it mimics hand tuning (hand tuning is a combination of coarse and fine tuning to the qualitatively best frequency position). As a consequence the tuning system is very fast. The tuning algorithm, which is controlled by a sequential circuit, is completely integrated; so there are only a few external components needed. The bus and the microcontroller can be kept very simple. The bus only consists of three wires (CLCK, DATA and WREN). The microcontroller must basically give two instructions: * Preset operation * Search operation.
1997 Apr 25
3
Philips Semiconductors
Preliminary specification
Matchbox global FM tuner
Description of the bus The OM5610 radio has a bus which consists of three wires, as shown in Table 1. Table 1 Bus signals DESCRIPTION software driven clock input data input/output write/read-input PIN 4 6 3 Table 2 Bus-clock functions STEREO (PIN 5) LOW HIGH LOW HIGH
OM5610
CLCK LOW LOW HIGH HIGH
RESULT stereo mono tuned not tuned
SIGNAL CLCK DATA WREN
The OM5610 has a 25-bit shift register; see Table 3 for an explanation of the shift register bits. If in search mode no transmitter can be found, all frequency bits of the shift register are set to logic 0. The bus protocol is depicted in Figs 2 and 3 and 4.
These three signals, together with the mono/stereo pin (STEREO; pin 5), communicate with the microcontroller. The mono/stereo indicator has two functions, which are controlled by the CLCK, as shown in Table 2. Table 3 Explanation of the shift register bits BIT S.24 (MSB) D.23 M.22 B0.21 B1.20 P0.19 P1.18 S0.17 S1.16 15 F.14 to F.0 (LSB) dummy frequency 0 - DESCRIPTION search start/end search up/down mono/stereo band band local/DX not used search-level of station
LOGIC STATE 0 1 0 1 0 1 0 0 0 1 0 see Table 4
RESULT after a search when a station is found or after a preset during the search action indicates if the radio has to search down indicates if the radio has to search up stereo is allowed mono is required (radio switched to forced mono) selects FM band selects FM band local DX determines the locking field strength during a search operation buffer determine the tuning frequency of the radio; see Table 5 for the bit values
1997 Apr 25
4
Philips Semiconductors
Preliminary specification
Matchbox global FM tuner
Table 4 Truth table for bits 16 and 17 S1.16 0 0 1 1 Values for bits F.14 to F.0 BIT VALUE 214 213 212 211 210 29 28 27 26 25 24 23 22 21 20 FM VALUE(1) (kHz) - 102400 51200 25600 12800 6400 3200 1600 800 400 200 100 50 25 12.5 SEARCH LEVEL FM (V) >15 >35 >75 >300 READING DATA
OM5610
S0.17 0 1 0 1 Table 5 BIT F.14 F.13 F.12 F.11 F.10 F.9 F.8 F.7 F.6 F.5 F.4 F.3 F.2 F.1 F.0 Note
While WREN is LOW data can be read by the microcontroller. At a rising edge of the CLCK, data is shifted out of the register. This data is available from the point where the CLCK is HIGH until the next rising edge of the CLCK occurs (see Fig.2). To read the entire shift register 24 clock pulses are necessary. WRITING DATA While WREN is HIGH the microcontroller can transmit data to the OM5610 (hard mute is active). At a rising edge of the CLCK, the register shifts and accepts one bit into LSB. At CLCK LOW the microcontroller writes data (see Fig.3). To write the entire shift register 25 clock pulses are necessary.
1. FM value of the affected oscillators: a) FM VALUE = FM-RF + FM-IF.
1997 Apr 25
5
Philips Semiconductors
Preliminary specification
Matchbox global FM tuner
OM5610
handbook, full pagewidth
WREN
data read
CLCK
DATA data available data available after search ready MSB is LOW data shift
MBH888
Fig.2 Read data.
handbook, full pagewidth
WREN
CLCK
DATA
MBH889
data shift
data change
Fig.3 Write data.
1997 Apr 25
6
Philips Semiconductors
Preliminary specification
Matchbox global FM tuner
BUS TIMING
OM5610
handbook, full pagewidth
WREN
VIH CLCK VIL
DATA
MBH890
tHIGH
tLOW
tda
Fig.4 Bus timing.
Table 6
Digital inputs PARAMETER MIN. - 0.6 MAX. UNIT
SYMBOL Digital inputs VIH VIL Timing fclk tHIGH tLOW tda INTERFACE * Digital driving: 3-wire bus clock frequency clock HIGH time clock LOW time
HIGH level input voltage LOW level input voltage
1.4 - - 1.67 1.67 -
V V
300 - - 14
kHz s s s
shift register available after `search ready'
* Audio output: typical 160 mV RMS for f = 75 kHz (unloaded; Zo = 5 k) * Supply voltages: - Pin 7: 5 V 10% current 25 mA - Pin 8: 9 to 12 V, current 2 mA, ripple 1 V * MPX-RDS: DC coupled (load 39 k), amplitude typical 150 mV (f = 75 kHz) * RF input connector: 2-pin connector, to be driven from a 75 source * 12 pin connector.
1997 Apr 25
7
Philips Semiconductors
Preliminary specification
Matchbox global FM tuner
OM5610
LIMITING VALUES IEC publication 68-1; full specification; EMC behaviour: the module is designed to be FCC friendly (part 15). SYMBOL RH Tamb Tstg Ves(pc) Ves(RFc) PARAMETER relative humidity operating ambient temperature storage temperature electrostatic handling for pin connector electrostatic handling for RF connector note 1 note 2 note 3 note 4 functional operation CONDITIONS 25 -10 -20 - - - - MIN. 85 +60 +70 2 300 4 500 MAX. % C C kV V kV V UNIT
Notes 1. Class B: human body model (1.5 k, 100 pF). 2. Class B: charge device model (0 , 200 pF). 3. Class A: human body model (1.5 k, 100 pF). 4. Class A: charge device model (0 , 200 pF).
1997 Apr 25
8
Philips Semiconductors
Preliminary specification
Matchbox global FM tuner
OM5610
CHARACTERISTICS RF signal generator impedance = 50 ; dummy used (see Fig.5); RF levels are EMF/2; f = 75 kHz; fi = 98 MHz; fmod = 1 kHz; left and right audio output; audio filter = 22 Hz to 15 kHz; temperature range = 15 to 35 C. SYMBOL FM mono lim RF S/N fL 3 dB limiting sensitivity RF sensitivity signal-to-noise ratio lower audio frequency bandwidth limit upper audio frequency bandwidth limit AM suppression total harmonic distortion search sensitivity RF attenuation in local mode audio output voltage level VFMi = 1 mV; unloaded VFMi = 1 mV fAF = 1 kHz; VFMi = 1 mV fAF = 1 kHz; VFMi = 1 mV VFMi = 100 V search stop bits S0.17 and S1.16 = 0 V9, 11 = -3 dB; V9, 11 = 0 dB at VFMi > 100 V (S + N)/N = 26 dB VFMi = 1 mV measured lower limit (-3 dB); fref = 1 kHz; measured with pre-emphasis measured upper limit (-3 dB); fref = 1 kHz; measured with pre-emphasis AM modulation m = 30%; fAF = 1 kHz - - - - 5.5 3.5 68 40 7.5 5 - 70 V V dB Hz PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
fH
12.5
14
-
kHz
AM THD VFMi RF VFM FM stereo S/N cs IO THD
40 - - 15 -
50 1.5 15 20 160
- 3 - 30 - - - 3 - 3
dB % V dB mV
signal-to-noise ratio channel separation channel imbalance stereo blend function total harmonic distortion
60 22 - 5 -
63 28 0.5 10 -
dB dB dB dB %
handbook, full pagewidth
50
10
45 60
75 asymmetrical output to RF input
MBH930
RF generator
dummy
Fig.5 RF signal generator and dummy.
1997 Apr 25
9
Philips Semiconductors
Preliminary specification
Matchbox global FM tuner
INTERNAL CIRCUITRY PIN 1 2 3 6 DESCRIPTION ground ground WREN DATA DC VOLTAGE (V) 0 0 - -
6 470 pF 470 3 470 pF
MBH891
OM5610
EQUIVALENT CIRCUIT
470
4
CLCK
-
470 4 470 pF
MBH892
5
STEREO
-
5V 33 k 470 5 470 pF
MBH893
7
+5 V
5
7
330 220 nF
MBH894
8
+12 V
12
8
1 k 470 nF
MBH895
1997 Apr 25
10
Philips Semiconductors
Preliminary specification
Matchbox global FM tuner
OM5610
PIN 9 11
DESCRIPTION audio right output audio left output
DC VOLTAGE (V) 0 0
EQUIVALENT CIRCUIT
22 9, 11
2.2 F 12 nF
5 k
MBH896
10 12
ground MPX-RDS
0 0.7
12 25 k 330 pF 5 k
MBH897
1997 Apr 25
11
Philips Semiconductors
Preliminary specification
Matchbox global FM tuner
BOARD OUTLINE
OM5610
handbook, full pagewidth
34.5 29.86 1.9 2.54
2.54
1
2 2.54
5
13 24.5 20 11 12 20
3.3
3.1
7.7
SFE
7.5 max
8
3.3
3.1
MBH886
Dimensions in mm.
Fig.6 Board outline for OM5610.
1997 Apr 25
12
Philips Semiconductors
Preliminary specification
Matchbox global FM tuner
DEFINITIONS Data sheet status Objective specification Preliminary specification Product specification Limiting values
OM5610
This data sheet contains target or goal specifications for product development. This data sheet contains preliminary data; supplementary data may be published later. This data sheet contains final product specifications.
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale.
1997 Apr 25
13
Philips Semiconductors
Preliminary specification
Matchbox global FM tuner
NOTES
OM5610
1997 Apr 25
14
Philips Semiconductors
Preliminary specification
Matchbox global FM tuner
NOTES
OM5610
1997 Apr 25
15
Philips Semiconductors - a worldwide company
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For all other countries apply to: Philips Semiconductors, Marketing & Sales Communications, Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax. +31 40 27 24825 (c) Philips Electronics N.V. 1997
Internet: http://www.semiconductors.philips.com
SCA54
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.
Printed in The Netherlands
547027/1200/02/pp16
Date of release: 1997 Apr 25
Document order number:
9397 750 02167

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