U2860BB TEMIC | Alldatasheet

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Technical content

Features

/C0068Two alignment-free PLL FM demodulators, automatic lock in on the received sound carrier frequency /C0068Mono and dual channel application /C0068Sound IF inputs provided for ceramic filters /C0068Automatic mute for 2nd sound channel (squelch) /C0068Mute function for both sound channels /C00685 V supply voltage, low power consumption /C0068Few external components Loop filter 1 VCO 1 Mute 13 11 12 Supply 94 8139 e C stab VCO offset

10 VCO offset

Squelch (second carrier) Squelch V in1 V in2 Mute VAF1 VAF26 R ref (optional) Figure 1. Block diagram

Rev. A1, 17-Jun-96 Preliminary Information 2 (11) Circuit Description The U2860B includes two identical sound IF channels. Each consists of a limiter amplifier, PLL FM demodulator and AF amplifier. Additionally, this circuit contains a squelch function, mute switch and internal voltage regulation. Limiter Amplifiers The intercarrier signals are fed through external ceramic bandpass filters to a 7-stage limiter amplifier. This guarantees high input sensitivity and excellent AM suppression. PLL FM Demodulators The alignment-free “Phase Locked Loop” (PLL) demo- dulator covers a wide frequency range of 4.5 MHz up to 6.5 MHz with low noise performance. The linear voltage to frequency characteristic results in low harmonic distortion. The free-running frequency of the internal VCO circuit is about 5.5 MHz. For this frequency, the input sensitivity and VCO locking is optimal. An addi- tional external resistor at Pin 10 allows a frequency shift of ±1 MHz via an internal offset current. With this option, it is possible to shift the optimum conditions to the upper frequency (6.5 MHz) or to the lower frequency (4.5 MHz). The offset current acts simultaneously on both VCO circuits. If no resistor is connected, the offset current is disabled. Audio Amplifiers The demodulated signals are amplified to 500 mVrms with low output impedance at the audio outputs (Pin 6 and Pin 7). AC decoupling at Pin 8 and Pin 9 of the audio am- plifiers leads to high common mode rejection. Squelch Function For channel 2 the audio output amplifier and VCO2 is muted automatically (squelch) when the second sound carrier is not present. This avoids a wrong identification for stereo and dual sound in the stereo decoder. Therefore, with mono sound, there is no output signal at Pin 6. The automatic squelch function can be disabled by switching Pin 4 to ground. Mute Switch Simultaneously muting of both circuits is possible by switching Pin 3 to ground. Internal Voltage Stabilizer The internal bandgap reference ensures constant performance independent of supply voltage and temperature.

Ordering Information

Extended Type Number Package Remarks U2860B-B DIP14 U2860B-BFP SO14 taped

Figure 2. Connection diagram

1 V in1 Intercarrier input of sound

2 NC Not connected

3 V mute Mute for sound channel 1+2

4 V sque Automatic mute for 2nd sound

5 NC Not connected

6 VAF2 Audio output AF2 of sound

7 VAF1 Audio output AF1 of sound

8 C 8 Decoupling capacitor for sound

9 C 9 Decoupling capacitor for sound

10 R ref VCO offset of the free-running

11 C stab Internal supply voltage

12 GND Ground

13 V S Supply voltage

14 V in2 Intercarrier input of sound

Rev. A1, 17-Jun-96 Preliminary Information 4 (11) Operating Range Parameters Symbol Value Unit Supply voltage range Pin 13 V S 4.5 to 9.0 V Ambient temperature Tamb 0 to +85 °C Thermal Resistance Parameters Symbol Value Unit Junction ambient when soldered to PCB R thJA 90 K/W

Electrical Characteristics

V S = 5 V , Tamb = 25/C0095C, reference point Pin 12, unless otherwise specified Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit DC-supply Pin 13 Supply voltage range V S 4.5 5.0 9.0 V Supply current IS 27 33 mA Intercarrier input 1 Pin 1 DC input voltage V DC 1.75 V Input resistance See note 1 R in 680 750 /C0087 Input limiting voltage Input signal vin: f = 5.5 MHz output signal AF1: v AF1 ⇒ –3 dB vlim 150 /C0109V Intercarrier input 2 Pin 14 DC input voltage V DC 1.75 V Input resistance See note 1 R in 680 750 /C0087 Input limiting voltage Input signal vin: f = 5.74 MHz output signal AF2: v AF2 ⇒ –3 dB vlim 150 /C0109V Input signal for automatic second sound carrier “mute off” (squelch) Audio output AF2 active vin > 0.7 1.0 < 1.5 mV FM demodulators, internal VCO’s Pin 10 Free-running frequency fVCO 5.5 MHz Oscillator drift (free-running) as function of temperature ΔT = 55°C ΔfVCO 500 kHz Oscillator shift (free-running) as function of supply voltage 4.5 V < VS < 5.5 V ΔfVCO 200 kHz Adjustment range of free-running frequencies By external resistor Rref at Pin 10 Δfadj ±1 MHz Adjustment resistance for free-running frequencies R ref 15 22 30 k/C0087

Rev. A1, 17-Jun-96 5 (11) UnitMax.Typ.Min.SymbolTest Conditions / PinsParameters FM demodulators, internal VCO’s Pin 10 Steepness of free-running frequency adjustment Resistor Rref at Pin 10 S 200 kHz/k/C0087 Capture range of PLL’s Δfcap ±1.4 ±1.9 MHz Holding range of PLL’s Δfhold ±2.0 ±3.0 MHz Audio outputs, AF1 (Pin 7) and AF2 (Pin 6) DC output voltage V DC 2.2 V DC output current IDC 1.0 –1.3 mA Output resistance See note 1 R out 150 /C0087 AC output peak current iAC ±1.0 mA AF output voltage, RMS value vin = 10 mV , f = 5.5 MHz, FM-dev. = 27 kHz, f mod = 1 kHz vAF 500 mV Difference between the output signals ΔvAF ±1 dB Total harmonic distortionvin = 10 mV , f = 5.5 MHz, FM-dev. = 27 kHz, f mod = 1 kHz THD 0.1 0.5 % AM suppression vin = 10 mV , f = 5.5 MHz, f mod = 1 kHz, reference signal: FM-dev. = 50 kHz test signal: m = 30% /C0097AM 46 66 dB Crosstalk attenuation between the AF outputs f = 50 Hz to 12.5 kHz /C0097att 70 dB Supply voltage ripple rejection V RR < 200 mV , f = 70 Hz RR 24 dB Mute switch Pin 3 Control voltage - muteoff - mute on AF outputs active AF outputs not active V mute 2.0 V S 0.8 V V Control current Imute 150 /C0109A Squelch function Pin 4 Control voltage for automatic mute-2nd carrier “off” automatic mute-2nd carrier “on” V sque 0 2.0 0.8 V S V V Control current Isque 150 /C0109A Notes 1.) This parameter is given as an application information and not measured during final testing.

Rev. A1, 17-Jun-96 Preliminary Information 10 (11) Dimensions in mm 94 9445 94 9301

Rev. A1, 17-Jun-96 11 (11) Ozone Depleting Substances Policy Statement It is the policy of TEMIC TELEFUNKEN microelectronic 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 TELEFUNKEN microelectronic 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 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 TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2831, Fax number: 49 (0)7131 67 2423