D1703C

UPD1703C-011 NEC | Alldatasheet

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PHASE LOCKED LOOP FREQUENCY SYNTHESIZER FM/AM DIGITAL TUNING SYSTEM CONTROLLER CMOS LSI The uPD1703C-011 is a CMOS LSI designed for using as a PLL Frequency Synthesizer Digital Tuning System Controller. The ¢PD1703C 011 provides a set of fluorescent indicator panel (FIP) segment drivers, a clock generator and a power-on clear circuit. The {PD1703C-011 is packaged in a 28 pin slim dual in-line package (DIP).

FEATURES

© PLL, swallow counter and system controller are realized in a single chip. © Fluorescent indicator panel driver incorporated (segment outputs) © {nternal display decorder for 4.5 digit multiplexed display @ Very low stand-by current- --less than 10 pA © High speed and low power consumption due to CMOS © High reference frequency due to pulse swallowing (FM band: 25 kHz) It results in a high carrier-to-noise ratio. © Internal clock oscillator and divider circuit. @ Automatic power-on clear without any external components. © Preset memory address display (External latch/decorder is required.) © Display brightness contro! (DIMMER) - - - - - Duty ratio 1: 4 @ FM/AM tuner: - - - - U.S., Europe and Japan bands @ External programmable IF offset for FM band (10.650 MHz, 10.675 MHz, 10.700 MHz, 10.725 MHz) FUNCTION OF TUNER @ Automatic up or down search (SEEK) @ Manual up or down search @ Preset station memory call PACKAGE DIMENSIONS Unit: mm (inches) 21 1R004/ ae

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264(01 0.6(0 02) = 11 J le | S (04) ge 45° 3202013 NEC cannot assume any responsibility for any circuits shown or represent that they are free from patent =, . infringement Nippon Electric Co.Ltd. NEC reserves the right to make changes at any time without notice in order to improve design and supply

ABSOLUTE MAXIMUM RATINGS - Supply Voltage Vpp —0.3 to +6.0 v Input Voltage VI -0.3 to Vop v Output Voltage Vo —0.3 to Vpp Vv Output Breakdown Voltage * Veps —36 v Output Current 1oH —10 mA Storage Temperature Tstg —55 to +125 °c Operating Temperature Topt =35 to +75 °c * : Segment Output Terminals (P-ch open drain) ELECTRICAL CHARACTERISTICS (Ta=—35 to +75 °C, Vpp=4.5 to 5.5 V) CHARACTERISTIC [symeou| min. | TyP. | Max. | UNIT TEST CONDITIONS | Vin1 = |0.8Vpp VppD Vv SD terminal High Level Input Voltage Vin2 |0.7Vpp Vop | V CE terminal Vin3 |0.6Vpp Vop | Vv KO to K3 terminals v 0 0.3V v CE terminal Low Level Input Voltage 1b SOD)” — ViL2 0) 0.2Vpp| V SD, KO to K3 terminals VoH1 4.0 v EO, D, MUTE: IQH=~0.5 mA - High Level Output Voltage VoH2 | 3.0 v SEG: IoH=—0.5 mA Vou3 | 40 v PSC: IQH=—0.2 mA Low Level Output Voltage Ol Ol | VoL2 | 05 v D, MUTE, PSC: IQ, =0.2 mA High Level Input Current WH 5.0 | 25 | 100 | yA K: Vj=Vpp=5.0 V hint os | 25 | MHz | AM vE=tOVp, Db at Frequency Response sine wave fine | 05 88 | MHz | sauarewave OOS . Supply Voltage Rise Time | Tr | 0.5 s Vpp:074.5V Supply Current 'pp 10 uA CE: Low Level Output Off Leak Current torr | | 8.0 | WA | SEG: Vpg--30V

NEC's Digital Tuning System provides full electronic control of a vari-cap tuned FM/AM radio receiver and stereo. The block diagram of the system is shown in Fig. 1. This is a Phase Locked Loop Digital Tuning System which consists of two integ:ated circuits; controller plus PLL ina single chip, and two-modulus prescaler The controller chip (uP!)1703C-011) provides Phase Locked Loop capability with on-chip frequency division, a reference oscillator whose frequency is controlled by an external crystal of 4.5 MHz, and phase comparator circuitry. It accepts directly an AM local oscillator signal and an FM signal from two-modulus prescaler (uPB553AC), and outputs control signals for closed loop operation of these oscillators. The outputs drives filters for supplying analog voltages to the vari-cap tuners. The controller also provides the signals to drive the display. The frequency of the tuned station is displayed on a 4.5 digit multiplexed display. Six favorite stations on each band can be stored as well ¢s “‘last stations tuned” information. The two-modulus prescaler (uPB553AC) is suitable for pulse swallowing in this system. uPD1703C-011 wr MUTE D7 DIGIT TUNING a DRIVERS | ACTIVE EOI DS Ni *nLTER. | | TUNING} FictER Oo uPBS53AC DISPLAY (FIP) FM/AM FM Ose PRESCALER FM Psc SEG.A AM Osi c AM SEG.G STATION DETECTOR so x1 KO

4.5 MHz KEY and SWITCH

ie Ka | crysta MATRIX x2 K3| Fig. 1 BLOCK DIAGRAM

PIN CONNECTION (Top View) AM GND FM FO KI K2 K3 a b c d e f gq IN a a Tee ee oe ee ee ees £O1 £02 CE PSC xt x2 sO MUTE D1 D2 03 D4 65 Vop EXPLANATION OF INPUT AND OUTPUT TERMINALS €01 These three-state outputs are used (via active filters) to supply analog voltages to the tuner E02 vari-cap for controlling the local oscillators CE This input is used to designate the stand-by mode to the chip. It is low to designate the stand-by mode. (PLL: disable, display: off, clock generator: stop) PSC This output is used to control the division ratio of the FM two-modulus prescaler (uPB553AC). X1,X2 These inputs are for connection to a 4.5 MHz crystal. sD This input is used to control the station searching operation (AU/AD). It is high to indicate the presence of a station and the operation is terminated. MUTE This output line is high to mute the radio in the case of station change, band change, and so on. Di to D5 These outputs are used as digit drivers for the display. (Active low) Vop This is a 4.5 to 5.5 volt supply for the chip. . atog These outputs are p-ch open drain used as segment drivers for the display. They are also used as vertical drive for the control key and mode switch matrix. KO to K3 These inputs are from seven by four matrix. Various functions are entered through the matrix. See Fig. 2 for the matrix assignments. FM This is the FM band local oscillator input. The frequency is divided by 16/17 using a two- modulus prescaler (uPB553AC). GND System ground. AM This is the AM band local oscillator input.

CONTROL KEY AND MODE SWITCH MATRIX 18853x4

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(v") —() P< rt g 1 oe Te AM 1S$53x3 a D E d @ f a O momentary switch Z\\: diode switch {initial set) “ON” "OFF" Fig. 2 © Searching of the station UP,DOWN * AUTO/MANUAL switch: ON (SEEK) A momentary depression causes automatic up or down searching by the speed of 80 ms/ch until SD terminal is activated (active high) or any key is depressed. “ AUTO/MANUAL switch: OFF (Manual searching) A momentary depression will tune to next channel, and continuous depression more than 0.5 second allows traversing up or down the entire band by the speed of 80 ms until the key is released. © Preset of the station ME The tuning information is stored into internal RAM by depressing ME key and then desired memory key within 5 seconds from the time ME key was initially depressed. If any key is depressed in this period, the ME function is cancelled. M1 to M6 Six favorite stations can be recalled from internal RAM for ach band. When it is switched from one band to the other band, it will tune to “‘Last-tuned-to station’ on that band. Each time a station is changed, the controller ptovides a signal to mute the tuner.

a | © Selection of the radio band B0, B1 These switches are for selection of the district. AM/FM This switch is for selection of the radio band. B2 This switch is for selection of the receiving band and channel spacing of AM radio for U.S. band. Selected Band | District. | Receiving Frequency | Channel Spacing | \\F ott FM Japan 76.1 to 89.9 MHz 100 kHz tr 4 | on | AM Japan 522 to 1611 kHz 9 kHz 450 kHz | off | FM Europe | 87.5 to 108.0 MHz *2 | 50 kHz 4 [on | AMEurope | 522 to 1611 kHz 9 kHz 450 kHz x off FMU.S. | 87.9 to 107.9 MHz 200 kHz 4 off | on | on on | AMUS. 522 to 1611 kHz 9 kHz 450 kHz off on | AMUS. 530 to 1620kHz | 10 kHz 450 kHz X : Don’t care. Table 1. *1 FM band IF offset IFO, 1F1 These switches program the chip to accept 4 different intermediate frequencies for each band in 25 kHz steps. Intermediate Frequency (MHz) Japan US. | Europe off | on | 10.750 | 10.650 10.650 on | on | 10.725 10.675 10.675 off | off | 10.700 | 10.700 | 10.700 off | 10.675 10.725 10.725 Table 2 *2 108/104 This switch is for selection of receiving frequency of FM radio for Europe band. 108/104 | Receiving Frequency on 87.50 to 108.00 MHz off 87.50 to 104.00 MHz Table 3.

© Display interface The center frequency of tuned station is displayed on a 4.5 digit FIP. The uPD1703C-011 provides direct interface to the FIP. The yPD1703C-011 interfaces with all the devices requiring up to 30 V levels. The segment outputs go directly to the segments (anodes) of the multi-digit 7 segment FIP. The digit outputs go to PNP transistor ar-ay to drive the digits (grids) of the FIP. The LED display can be driven by using appropriate interface cir suits, a fp a a ane it a T | E100K8 -25V (MAX.) 47 ko 100 k2 ol | BE en a aa +5V “25 Fig. 3 © Display format © Segment Pattern soy a - - pf — — f Paguceonowan [le Peg Togo ff oo “LE Ie a © Display brightness control (DIMMER) DIM This switch is for selection of display brightness. © Protection from the miss key input LOCK This switch is for protection from miss key input. @ Protection of the key chattering

@ Preset memory address display In the case of memorizing the displayed frequency or recalling a preset memory, the chip provides the data to display preset memory addre:s corresponded to the disired memory key At the timing T2 of digit output D5, the data of memory address are provided segment output e, f and g. The data are binary coded deimal (BCD). wr 1 M1 18853 4 e -—|B a 2-4 m2 f ——C Qc 8 3h 2202 N3, of} >t lp a} c af ee Ma D5}+-{>0 7 cK ie} 5 wy MS 7 D 6 M6 100 k a i »PD4035C uPB74LS42C Fig. 4 o - TH D2 ial DS we, 1 T1: arround 600 ps 12: 33.3 us tae (— frequency and symbol display preset memory address display Fig. 5 * The segment output at the timing T1, T2 of digit output D5 is as follows. “Segment | a a | b c d e f | g Timing 7 | | T1 (AM) (1) (1) (FM/OP) blank T2 blank BCD output Table 4. * Segment output and preset memory address. 9 f e Address 0 0 1 [om 0 1 | m2 i} 1 M3 1 0 ja 0 1 | 1 o | Table 5.

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