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 OM5610 FEATURES ORDERING INFORMATION • Local/DX switching to improve large signal handling on FM when an outdoor antenna or cable network is connected UNIT FREQUENCY (MHz) BUS 87.5 to 108 3-wire bus OM5610 • 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 RF ground handbook, full pagewidth RF input 1 2 3 4 5 6 7 8 9 10 11 12 MBH887 Fig.1 OM5610 connectors. 1997 Apr 25 2 Philips Semiconductors Preliminary specification Matchbox global FM tuner OM5610 PINNING PRESET OPERATION PIN 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: DESCRIPTION 1 ground 2 ground 3 WREN 4 CLCK 5 STEREO 6 DATA 7 supply voltage (+5 V) 8 supply voltage (+12 V) 9 audio right output 10 ground 11 audio left output 12 MPX-RDS 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. FUNCTIONAL DESCRIPTION The OM5610 is an integrated FM stereo radio circuit including digital tuning and control functions. The radio 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. 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. 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. The PLL stereo decoder incorporates a signal dependent stereo-blend circuit and a soft-mute circuit. 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. 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 OM5610 Description of the bus Table 2 Bus-clock functions The OM5610 radio has a bus which consists of three wires, as shown in Table 1. CLCK STEREO (PIN 5) LOW LOW stereo Table 1 LOW HIGH mono HIGH LOW tuned HIGH HIGH not tuned Bus signals SIGNAL CLCK DESCRIPTION PIN software driven clock input 4 DATA data input/output 6 WREN write/read-input 3 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. 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 RESULT The bus protocol is depicted in Figs 2 and 3 and 4. Explanation of the shift register bits BIT S.24 (MSB) DESCRIPTION search start/end LOGIC STATE RESULT 0 after a search when a station is found or after a preset 1 during the search action indicates if the radio has to search down D.23 search up/down 0 1 indicates if the radio has to search up M.22 mono/stereo 0 stereo is allowed 1 mono is required (radio switched to forced mono) B0.21 band 0 selects FM band B1.20 band 0 selects FM band P0.19 local/DX 0 local 1 DX P1.18 not used S0.17 search-level of station 0 see Table 4 S1.16 determines the locking field strength during a search operation 15 dummy 0 buffer F.14 to F.0 (LSB) frequency − 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 OM5610 Truth table for bits 16 and 17 READING DATA S0.17 S1.16 SEARCH LEVEL FM (µV) 0 0 >15 1 0 >35 0 1 >75 1 1 >300 Table 5 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. Values for bits F.14 to F.0 WRITING DATA FM VALUE(1) (kHz) BIT BIT VALUE F.14 214 − F.13 213 102400 F.12 212 51200 F.11 211 25600 F.10 210 12800 F.9 29 6400 F.8 28 3200 F.7 27 1600 F.6 26 800 F.5 25 400 F.4 24 200 F.3 23 100 F.2 22 50 F.1 21 25 F.0 20 12.5 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. Note 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 OM5610 BUS TIMING handbook, full pagewidth WREN VIH CLCK VIL DATA MBH890 tHIGH tLOW tda Fig.4 Bus timing. Table 6 Digital inputs SYMBOL PARAMETER MIN. MAX. UNIT Digital inputs VIH HIGH level input voltage 1.4 − V VIL LOW level input voltage − 0.6 V fclk clock frequency − 300 kHz tHIGH clock HIGH time 1.67 − µs tLOW clock LOW time 1.67 − µs tda shift register available after ‘search ready’ − 14 µs Timing INTERFACE • Digital driving: 3-wire bus • Audio output: typical 160 mV RMS for ∆f = 75 kHz (unloaded; Zo = 5 kΩ) • 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 kΩ), amplitude typical 150 mV (∆f = 75 kHz) • RF input connector: 2-pin connector, to be driven from a 75 Ω 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 PARAMETER RH relative humidity Tamb operating ambient temperature Tstg storage temperature Ves(pc) electrostatic handling for pin connector electrostatic handling for RF connector Ves(RFc) CONDITIONS MAX. UNIT 25 85 % −10 +60 °C −20 +70 °C note 1 − 2 kV note 2 − 300 V note 3 − 4 kV note 4 − 500 V functional operation Notes 1. Class B: human body model (1.5 kΩ, 100 pF). 2. Class B: charge device model (0 Ω, 200 pF). 3. Class A: human body model (1.5 kΩ, 100 pF). 4. Class A: charge device model (0 Ω, 200 pF). 1997 Apr 25 MIN. 8 Philips Semiconductors Preliminary specification Matchbox global FM tuner OM5610 CHARACTERISTICS RF signal generator impedance = 50 Ω; 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 PARAMETER CONDITIONS MIN. TYP. MAX. UNIT FM mono Φlim 3 dB limiting sensitivity V9, 11 = −3 dB; V9, 11 = 0 dB at VFMi > 100 µV − 5.5 7.5 µV ΦRF RF sensitivity (S + N)/N = 26 dB − 3.5 5 µV S/N signal-to-noise ratio VFMi = 1 mV − 68 − dB fL lower audio frequency bandwidth limit measured lower limit (−3 dB); fref = 1 kHz; measured with pre-emphasis − 40 70 Hz fH upper audio frequency bandwidth limit measured upper limit (−3 dB); fref = 1 kHz; measured with pre-emphasis 12.5 14 − kHz αAM AM suppression AM modulation m = 30%; fAF = 1 kHz 40 50 − dB − 1.5 3 % search stop bits S0.17 and S1.16 = 0 − 15 − µV 15 20 30 dB THD total harmonic distortion VFMi search sensitivity αRF RF attenuation in local mode VFM audio output voltage level VFMi = 1 mV; unloaded − 160 − mV S/N signal-to-noise ratio VFMi = 1 mV 60 63 − dB αcs channel separation fAF = 1 kHz; VFMi = 1 mV 22 28 − dB FM stereo ∆IO channel imbalance fAF = 1 kHz; VFMi = 1 mV − 0.5 3 dB α stereo blend function VFMi = 100 µV 5 10 − dB THD total harmonic distortion − − 3 % handbook, full pagewidth 50 Ω 10 Ω 45 Ω 75 Ω asymmetrical output to RF input 60 Ω MBH930 RF generator dummy Fig.5 RF signal generator and dummy. 1997 Apr 25 9 Philips Semiconductors Preliminary specification Matchbox global FM tuner OM5610 INTERNAL CIRCUITRY PIN DESCRIPTION DC VOLTAGE (V) 1 ground 0 2 ground 0 3 WREN − 6 DATA − EQUIVALENT CIRCUIT 470 Ω 6 470 pF 470 Ω 3 470 pF MBH891 4 CLCK − 470 Ω 4 470 pF MBH892 5 STEREO − 5V 33 kΩ 470 Ω 5 470 pF MBH893 7 +5 V 5 330 Ω 7 220 nF MBH894 8 +12 V 12 1 kΩ 8 470 nF MBH895 1997 Apr 25 10 Philips Semiconductors Preliminary specification Matchbox global FM tuner PIN DESCRIPTION OM5610 DC VOLTAGE (V) 9 audio right output 0 11 audio left output 0 EQUIVALENT CIRCUIT 22 Ω 2.2 µF 9, 11 12 nF 5 kΩ MBH896 10 ground 12 MPX-RDS 0 0.7 12 25 kΩ 330 pF 5 kΩ MBH897 1997 Apr 25 11 Philips Semiconductors Preliminary specification Matchbox global FM tuner OM5610 BOARD OUTLINE handbook, full pagewidth 34.5 29.86 2.54 1.9 2.54 1 5 2 2.54 13 24.5 20 20 11 3.3 7.7 12 3.1 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 OM5610 DEFINITIONS Data sheet status Objective specification This data sheet contains target or goal specifications for product development. Preliminary specification This data sheet contains preliminary data; supplementary data may be published later. Product specification This data sheet contains final product specifications. Limiting values 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 OM5610 NOTES 1997 Apr 25 14 Philips Semiconductors Preliminary specification Matchbox global FM tuner OM5610 NOTES 1997 Apr 25 15 Philips Semiconductors – a worldwide company Argentina: see South America Australia: 34 Waterloo Road, NORTH RYDE, NSW 2113, Tel. +61 2 9805 4455, Fax. +61 2 9805 4466 Austria: Computerstr. 6, A-1101 WIEN, P.O. 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