U2510B TEMIC | Alldatasheet
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Technical content
Features
/C0068Superior FM strong signal behavior by using RF AGC /C0068Soft mute and HCC for decreasing interstation noise in FM mode /C0068Excellent AFC performance (level controlled, both polarities available) /C0068Level indicator (LED drive) for AM and FM /C0068DC mode control: AM, FM and tape /C0068Wide supply-voltage range and low quiescent current /C0068High AF output power: 1 W /C0068Electronic volume control /C0068Electronic AF bandwidth control (treble and high cut) /C0068Output stage for headphone and speaker drive Block Diagram FM front end AM front end FM AGC 13912 V oltage stab. and mode control AM/FM AFC control AM IF amp. and detect. AM AGC Level indic. FM IF amp. FM discr. Power amp. AF preamp. V olume Mute HCC 87 6 AFC 14 16 FM osc. tank FM RF tank IF BPE 22 6 (Replaceable) FM RF BPE AM ant. AM osc. tank AGC FM ant. 21 13 20 19 1 22 18 V S Treble Vo lV S LED AFC mode Tape AM FM V S IF AGC IF RF AGC V Ref Figure 1. Block diagram
Figure 2. Pinning
1 Mute Mute voltage output, time constant (C23),
2 FM-discr FM discriminator filter connection, ceramic
4 V ol ctrl inInput for volume control voltage
5 AMOsc AM oscillator tank circuit input, recommended
6 FM–AFC AFC diode connection, coupling capacitor
7 FMOsc FM oscillator tank circuit input, recommended
9 FMtank FM RF tank circuit connection, recommended
10 AMtank AM RF tank circuit connection, recommended
11 FM-AGC FM AGC voltage output, time constant (C20).
12 FMin FM RF input (common-base preamplifier
13 FE-GND FM front-end ground
14 AM/FM
15 Mode ctrl
17 FM-IFin FM IF input, input impedance = 330 /C0087
18 V Treble in Treble control voltage input
19 LED drive Level indicator output
20 IF-GND IF ground
21 AFC switch AFC function control input:
22 VAGC/AFC AGC/AFC voltage, time constant adjust (C10),
23 AM/FM
24 AFin Audio amplifier input, input resistance
26 V S Supply voltage input
27 AFout Audio amplifier output
28 AF-GND Ground of the audio power stage
Rev. A1, 06-Apr-98 3 (15) Terminal Voltages Test circuit: Vin = 0 V oltage/V Pin Symbol V S = 3 V V S = 6 V AM FM TAPE AM FM TAPE 1 Mute voltage (R3 = 0) V 1 – 1.6 – – 1.6 – 2 FM discriminator V 2 – 1.0 – – 1.0 – 5 AM oscillator V 5 2.4 – – 2.4 – – 6 FM AFC V 6 – 1.9 – – 1.9 – 7 FM oscillator V 7 – 2.4 – – 2.4 – 9 FM RF tank V 9 – 2.4 2.4 – 2.4 – 10 AM input V 10 2.4 – – – 2.4 –
11 FM AGC V 11 – 0 – – 0 –
12 FM input V 12 1.4 – – 1.4 –
13 Front end ground V 13 – – – – – –
14 AM/FM IF output V 14 2.9 2.7 – 5.9 5.7 – 15 Mode control switch V 15 0 – 2.9 0 – 5.7
16 AM IF input V 16 0 – – 0 – –
17 FM IF input V 17 – 0.7 – – 0.7 –
19 LED V 19
20 IF ground V 20 0 0 0 0 0 0
22 AGC (AM)/AFC (FM) V 22 1.5 1.2 – 1.5 1.2 – 23 Detector output V 23 1.5 1.2 – 1.5 1.2 –
28 AF ground V 28 0 0 0 0 0 0
Rev. A1, 06-Apr-98 4 (15) Absolute Maximum Ratings Parameters Symbol Value Unit Supply voltage V S 13 V Power dissipation Ptot 900 mW Ambient temperature range Tamb –20 to +75 °C
Electrical Characteristics
V S = 6 V , Tamb = 25°C, test circuit (figure 16), unless otherwise specified Parameters Test Conditions / PinsSymbol Min. Typ. Max. Unit Supply voltage range V S 2.5 9 * V Oscillator stop voltage V S 2.2 V Operating temperature range T –20 +75 °C Supply quiescent current V i1 = Vi2 = V4 = 0; AM (S 2 = AM) FM (S 2 = FM) TAPE (S 2 = Tape) IS IS IS 4.0 6.5 2.2 mA mA mA Regulated voltage Pin 8 V Ref 2.4 V Audio amplifier V i3 (Pin 24), test point: Vo (Pin 27) f = 1 kHz AF measuring range: 30 Hz to 20 kHz, S2 = Tape, S4 = A, S5 = A Input resistance Pin 24 R j 100 k/C0087 Closed loop voltage gain GV af1 = 20 log (Vo/Vi3) V i3 = 10 mV GV af1 40 dB Output voltage V i3 = 100 mV , S4 = B Vo 0.7 3 mV High–end cut-off frequency fc (–3 dB) S5 = B fc fc 0.8 kHz kHz Supply-voltage rejection ratioSVRR = 20 log (Vhum /Vo) V hum = 200 mV , fhum = 200 Hz, S4 = B SVRR 32 dB Noise voltage S4 = B, Vi3 = 0 V n 300 1000 /C0109V AF output power THD = 10 %, RL = 8 /C0087 V S = 4.5 V V S = 6.0 V V S = 9.0 V Po Po Po 400 225 420 1000 mW mW mW Distortion Po = 50 mW, RL = 8 /C0087 d 0.6 % FM section, Vi2 = 60 dB/C0109V, fi2 = 98 MHz, fm = 1 kHz, dev. = /C0034 22.5 kHz, fiIF = 10.7 MHz, AF measuring range: 300 Hz to 20 kHz, S2 = FM, S1 = A, S6 = B, test point: VD (Pin 23) FM front-end voltage gain GV FM = 20 log (ViIF / Vi2) S1 = B, Vi2 = 40 db/C0109V GV FM 30 dB Recovered audio voltage Pin 23 VD af 85 mV Detector output resistance Pin 23 R Do 7.5 k/C0087 Detector output distortion dev. = /C0034 75 kHz V i2 = 60 dB/C0109V V i2 = 105 dB/C0109V THD THD 0.5 0.8 * U2510B-M__T: max. 6 V
Rev. A1, 06-Apr-98 5 (15) Electrical Characteristics (continued) V S = 6 V , Tamb = 25°C, test circuit (figure 16), unless otherwise specified Parameters Test Conditions / PinsSymbol Min. Typ. Max. Unit AM rejection ratio m = 30% AM RR 25 dB RF sensitivity (S+N)/N = 26 dB (S+N)/N = 46 dB V i2 V i2 dB /C0109V dB /C0109V Limiting threshold (-3 dB) V i2 3 dB /C0109V Mute voltage Test point: Mute V i2 = 0 V i2 = 60 dB/C0109V V mute V mute 1.8 0.4 V V Mute depth Referred to V0 at Vi2 = 0 S6 = A S6 = C MD MD dB dB AFC holding range fOSC > fin, S3 = A, S6 = A V i2 /C0120 10 dB/C0109V V i2 = 20 dB/C0109V V i2 = 80 dB/C0109V FHR FHR FHR no AFC /C0034 180 /C0034 220 kHz kHz LED current ILED 5.5 mA Oscillator voltage eZload = 2.5 k/C0087 Pin 7V OSC 180 mV AM section V i1 = 60 dB/C0109V, fi1 = 1.6 MHz, fm = 1 kHz, m = 30%, fiIF = 455 kHz, AF measuring range: 300 Hz to 20 kHz, (S2 = AM, S1 = B, test point: VD ) AM front end voltage gain GV AM = 20 log (ViIF/Vi1) V i1 = 20 dB/C0109V, S1 = A GV AM 25 dB Recovered audio voltage V D af1 70 mV Detector output resistance Pin 23 R Do 7.5 k/C0087 Detector output distortion V i1 = 60 dB/C0109V V i1 = 105 dB/C0109V THD THD RF sensitivity (S+N)/N= 10 dB (S+N)/N= 26 dB (S+N)/N= 46 dB V i1 V i1 V i1 dB /C0109V dB /C0109V dB /C0109V AGC figure of merit referred to VD af V i1 = 105 dB/C0109V , voltage drop (VD af) = –10 dB FOM 100 dB IF input resistance Pin 16 Zi 3.1 k/C0087 LED current ILED 5.5 mA Oscillator voltage Pin 5 V OSC 160 mV
10.7 MHz
Figure 16. Test circuit customer’s requirements with the same IC.
- Shorter development time through less technical
- Higher reproductivity and low reject level in the set
which can also reduce the set’s total cost.
Rev. A1, 06-Apr-98 10 (15) Circuit Example Figure 17 shows a circuit diagram for low end AM/AF radios using the U2510B. Figure 18 shows a circuit diagram of AM/AF radio for higher class designs using all possible options of the U2510B. The layout of the PC board, shown in figure 19, is suitable for both the circuit example shown in figure 17 and the circuit example shown in figure 18. The associated coil, varicon and filter specifications are listed in the table: COIL DATA and SPECIAL COMPONENT PARTS. The circuit diagram (figure 18), has the following options compared to the circuit diagram (figure 17) (the additional parts, which have to be provided, are listed in parentheses): a) Soft mute and high cut control in FM mode (1 cap.) b) Electronic treble control in AM, FM and TAPE mode (1 pot.) c) On-chip mode control for TAPE application d) RF AGC in FM mode (1 capacitor) e) AFC, adjustable to the correct polarity and slope (1 cap.) f) Tuning indication using LED as an indicator (1 LED, 1 cap.) Option a) reduces the interstation noise by the two functions: soft mute and HCC. Both are controlled by the mute voltage (Pin 1). The soft mute reduces the loudness only, while the HCC reduces the high-end audio cut-off frequency of the audio preamplifier, when the signal level falls below a given threshold. This signal level threshold as well as the mute depth can be reduced by adding a resistor (R 3) or by increasing the FM front–end gain. Option b) allows the treble control for all operating modes without the need of an additional capacitor. This concept leads to a smooth and correct treble control behavior which is an improvement compared to the controlled RC network normally used. Option c) is very useful for application in radio cassette-recorders, for instance. In TAPE mode, the AM/FM receiver blocks are completely switched off and the signal from the tape recorder can be fed to the audio amplifier’s input directly. This saves quiescent current and makes the TAPE switching easy. However, to minimize switching noise by the mode switch, the following switch sequence should be chosen: AM, FM, TAPE. Option d) improves the strong signal behavior by protecting the FM mixer against overload. This is provided by the integrated broad-band-width RF AGC. If necessary, the AGC threshold can be decreased by a resistor, loading Pin 11 to GND (not shown). Option e) improves the tuning behavior substantially. The special design of the on-chip AFC function means that common disadvantages such as asymmetrical slope, (chip-) temperature effects and unlimited holding range are avoided. As mentioned in the “Pinning Description Table”, the AFC slope has to be inverted when the local oscillator (LO) frequency has to be below the receiving frequency. This can be achieved by connecting Pin 21 to the potential of Pin 8. In addition to the options described above, the following proposals are implemented in the circuit diagram (figure 18), too: /C0068An FM IFT is applied. This improves the channel selectivity and minimizes substantially the spurious responses caused by the FM ceramic filter (CF 2). With the choice of the winding ratio of this IFT, the FM front end gain can be matched to other values if neces- sary. /C0068In the FM RF input section, the low cost antenna filter 5, C15) is replaced by a special band pass filter (PFWE8). Such a BPF protects the FM front end against the out-off-band interference signals (TV channels, etc.) which could disturb the FM reception. Design Hints The value of the power supply blocking capacitor C13 should not be below 470 /C0109F. In addition, this capacitor should be placed near Pin 26. This will help to avoid unacceptable noise generated by noise-radiation from the audio amplifier via the bar-antenna. In designs, where the supply voltage goes below 2.5 V , the value of the blocking capacitor (C 7) should be chosen as 47 /C0109F or even higher. To achieve a high rejection of short wave reception in medium wave operation, the LO amplitude at Pin 5 should not exceed approximately 200 mV . This LO amplitude depends on the LO transformer’s Q and its turns ratio. For the LO transformer type described in the “Coil Data Table”, a resistor R 4 (2.2 k/C0087 for example) in parallel to the secondary side of the AM LO transformer T 2 is recommended. To minimize feedback effects in the RF/IF part in FM mode, the capacitor C6 should be placed as near to Pins 8 and 20 as possible. As shown in the application circuit diagrams (figures 17 and 18), in FM mode ceramic filter devices are used for channel selection (CF 2) while for FM, demodulation in LC-discriminator circuit (T4, C24, C25) is used instead of a ceramic discriminator device. Such an LC discriminator circuit can be easily matched to the FM IF selectivity block by its alignment. The zero- crossing of the discriminator can be detected at the demodulator output (Pin 23). The zero-crossing voltage is equal to half of the regulated voltage at Pin 8.
– using a low signal level for alignment. Figure 17. Application circuit (low cost)
Figure 18. Application circuit (upgraded) R2 only if VS > 8 V Figure 19. PC-board
Rev. A1, 06-Apr-98 13 (15) Coil Data and Special Component Part Part Stage L or C0 between Q 0 between Wire diameter/mm Terminal No. Number of turns Type Manufacturer T1 AM IFT 180 pF 1 to 3 1 to 3 0.07 1 to 2 111 0.07 2 to 3 0.07 4 to 6 7MC-7789N Toko 21K7-H5 Mitsumi T2 AM OSC 270 /C0109H 1 to 3 125 1 to 3 0.06 1 to 3 107 0.06 4 to 6 7TRS-8441 Toko L-5K7-H5 Mitsumi T3 FM IFT (optional) 100 pF 1 to 3 0.09 1 to 2 0.09 2 to 3 0.09 4 to 6 mat.: 7P A119 AC Toko T4 FM discrimi- nator 100 pF 1 to 3 0.09 1 to 3 mat.: 7P A119 AC Toko L1 FM RF air coil 4 mm diam. 0.62 3.75 L2 FM OSC air coil 4 mm diam. 0.62 3.75 L4 FM antenna air coil 4 mm diam. 0.62 4.75 L3 AM bar antenna L: 630 /C0109H total turns : 96 tap: 19 BPF1 (optional) PFWE8 (88 to 108 MHz) Soshin Electric Co. CF 1 SFU-455B BFCFL-455 Murata Toko CF 2 SFE10.7MA5 CFSK 107M1 Murata Toko CF 3 (optional) CDA10.7MC1 Murata C 1 Variable capacitor HD22124 AM/FM Toko 4 mm Pin 10C 1 Pin 8 18 mm 3 mm 80 mm Coil, bottom view Air coil AM bar antenna 13931 Figure 20.
Rev. A1, 06-Apr-98 14 (15)
Package Information
0.53 0.43 4.8 4.2 0.35 0.25 10.26 10.06 13044 1.778 3.3 0.9 8.7 8.5 12.2 11.0 Dimensions in mm 27.5 27.1 23.114 technical drawings according to DIN specifications
Rev. A1, 06-Apr-98 15 (15) Ozone Depleting Substances Policy Statement It is the policy of TEMIC Semiconductor 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 Semiconductor 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 Semiconductor GmbH 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 Semiconductor GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2831, Fax number: 49 (0)7131 67 2423