MC13027 MC13122 MC13022A MC13025 MC13027DW MC13027P MC13122DW MC13122P - Datasheet Archive

 

MC13027 MC13122 Product Preview AMAX Stereo Chipset The MC13027 and MC13122 have been specifically designed for AM radio which

 

Order this document from Analog Marketing MC13027 MC13027 MC13122 MC13122 Product Preview AMAX Stereo Chipset The MC13027 MC13027 and MC13122 MC13122 have been specifically designed for AM radio which can meet the EIA/NAB AMAX requirements. They are essentially the same as the MC13022A MC13022A and MC13025 MC13025 with the addition of noise blanking circuitry. The noise blanker consists of a wide band amplifier with an RF switch for blanking ahead the IF amplifier and a stereo audio blanker with adjustable delay and blanking times. · Operating Voltage Range of 6.0 V to 10 V · · · · · · · · · · · · AMAX STEREO IC CHIPSET MC13027 MC13027 RF Blanker with Built­In Wide Band AGC Amplifier Audio Noise Blanker with Audio Track and Hold Mixer Third Order Intercept of 8.0 dBm (115 dBµV) 20 20 Wide Band AGC Detector for RF Amplifier 1 1 Local Oscillator VCO Divide­by­4 for Better Phase Noise P SUFFIX PLASTIC PACKAGE CASE 738 Buffered Local Oscillator Output at the Fundamental Frequency Fast Stereo Decoder Lock DW SUFFIX PLASTIC PACKAGE CASE 751D (SO­20L) Soft Stereo Blend Signal Quality Detector to Control Variable Q­Notch Filters for Adaptive Audio Bandwidth and Whistle Reduction Signal Quality Detector for AM Stereo MC13122 MC13122 Very Low Distortion Envelope and Synchronous Detectors Variable Bandwidth IF ORDERING INFORMATION Device P SUFFIX PLASTIC PACKAGE CASE 710 28 Operating Temperature Range 1 Package MC13027DW MC13027DW SO­20L MC13027P MC13027P Plastic DIP TA = ­40 ° to +85°C 40 85°C MC13122DW MC13122DW 28 SO­28L MC13122P MC13122P DW SUFFIX PLASTIC PACKAGE CASE 751F (SO­28L) 1 Plastic DIP Functional Block Diagram To Synthesizer Osc Tank AGC Input Oscillator Buffer Voltage Controlled Oscillator ÷4 Wide Band AGC RF Input 450 kHz IF AGC Output Pulse Length Timer AM Detector RF Input Automatic Gain Controlled RF Amplifier IF Amplifier Mixer RF Blanking Shunt Switch L IF Amplifier AGC Decoder Track & Hold R Fast AGC Control Post Detector Filter Left Audio Right Audio 450 kHz Blend cos Fast Lock Pilot Control Detector Q Pulse Detector Stereo Indicator Lamp Fast/ Slow Pulse Delay Timer Pulse Length Timer I Yes/No Signal Quality Detector Signal Level MC13027 MC13027 This device contains 428 active transistors. This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice. MOTOROLA ANALOG IC DEVICE DATA Audio Blanking Stop­Sense RF AGC Meter Drive MC13122 MC13122 This device contains 670 active transistors. © Motorola, Inc. 1996 Issue 1 1 MC13027 MC13027 MC13122 MC13122 MC13027 MC13027 MAXIMUM RATINGS Rating Symbol ­40 to +85 °C ­60 to +150 °C TJ Operating Junction Temperature NOTE: Vdc Tstg Storage Temperature Range 12 TA Ambient Operating Temperature Unit VCC Power Supply Input Voltage Value 150 °C ESD data available upon request. MC13027 MC13027 ELECTRICAL CHARACTERISTICS (TA = 25°C, 8.0 VCC Test Circuit as shown in Figure 1.) Characteristic Min Typ Max Unit Supply Voltage Range (Pin 8) ­ 6.0 to 10 ­ V Wideband (WB) AGC Threshold ­ 1.0 ­ mVrms IF Output DC Current ­ 1.0 ­ mAdc Mixer DC Current Output ­ 0.83 ­ mAdc Local Oscillator Output ­ 600 ­ mVpp Wideband AGC Pull­Down Current (Pin 20) ­ 1.0 ­ mAdc Power Supply Current ­ 16 ­ mAdc Mixer 3rd Order Intercept Point (Pin 6) ­ 8.0 ­ dBm Mixer Conversion Gain ­ 2.9 ­ mS IF Amplifier Input Impedance (Pin 14) ­ 2.2 ­ k IF Amplifier Transconductance ­ 2.8 ­ mS IF Amplifier Load Resistance (Pin 16) ­ 5.7 ­ k IF Amplifier Collector Current (Pin 16) ­ 990 ­ µA 2 MOTOROLA ANALOG IC DEVICE DATA MC13027 MC13027 MC13122 MC13122 Figure 1. MC13027 MC13027 Test Circuit VCC AGC On VCC + RL1 51 C5 RF RF In RM1 16.7 + Pulse On 1 R4 47 Q4 MMBT3904L MMBT3904L Mixer In Blanker In R200 560 k CM1 RM5 0.01 16.7 RL2 51 C10 0.01 R10 56 k 22 µF WB AGC RM2 16.7 C14 47 µF Feedback R1 100 k MC13027 MC13027 WB AGC In WB AGC Out 20 RF Module R11 47 Q1 MMBFJ309L MMBFJ309L VCC Gnd C87 0.1 Pulse In Mixer In R299 51 Mixer 4.0 V + 1 C26 1.0 µF 2 C9 47 µF 3 VCLO VCLO 4.0 V 4 C293 10 µF 5 5 7 + C6 0.1 7 9 R201 120 R18 2.35 k Audio Blank 17 Delay Time IF Out RF Gnd R2b 10 k 16 IF In 14 10 VCC Gnd2 VCO RF Blank LO Out Mixer Out C37 0.01 LO Out 13 Audio Blank Q3 (Note 1) Q2 (Note 1) VCC R16 3.3 k R1b 10 k RF Blank 15 Time 4.0 Filter WB AGC Out R19 500 k RT1 39 k R3b 10 k Murata SFG450E SFG450E R21 510 C16 120 VCC 5 8 6 8 4.0 V Reg 6 Mixer In Blanker RF In Tuning Voltage MOTOROLA ANALOG IC DEVICE DATA + 4 100 NOTE: Audio 18 Blank Pulse Feedback + C11 0.1 Tuning V Audio 19 Blank Time 3 C16 10 µF R20 47 k C90 0.1 2 Blanker AGC RF In R2 82 VCC C103 0.1 R17 500 k L2 1.0 mH IF Out R15 500 k R12 1.8 k 432 1 12 RF Blank Q1b (Note 1) 11 R5b 390 k 4.0 V Reg 1. General purpose NPN transistor 2N3904 2N3904 or equivalent. 3 MC13027 MC13027 MC13122 MC13122 MC13122 MC13122 MAXIMUM RATINGS Rating Symbol Value Unit VCC 12 Vdc ­ 30 mAdc TA ­40 to +85 °C Power Supply Input Voltage Stereo (Pilot) Indicator Lamp Current (Pin 21) Operating Ambient Temperature Tstg ­65 to +150 °C TJ(max) 150 °C PD 1.25 10 mW/C Storage Temperature Range Operating Junction Temperature Power Dissipation Derated above 25°C p NOTE: ESD data available upon request. MC13122 MC13122 ELECTRICAL CHARACTERISTICS (VCC = 8.0 V, TA = 25°C, Test Circuit of Figure 2.) Characteristic Min Typ Max Unit Power Supply Operating Range 6.0 8.0 10 V Supply Current Drain (Pin 25) 10 20 25 mA Minimum Input Signal Level, Unmodulated, for AGC Start ­ 5.0 ­ mV Audio Output Level, 50% Modulation, L Only or R Only 290 400 530 mVrms Audio Output Level, 50% Mono 140 200 265 mVrms Output THD, 50% Modulation ( p , (Monaural Stereo) ) ­ ­ 0.3 0.5 0.8 1.6 % Channel Separation, L Only or R Only, 50% Modulation 22 35 ­ dB IF Input Voltage Range ­ 1.0­1000 ­ mV IF Input Resistance Range ­ 10 to 50 ­ k IF Amplifier Transconductance ­ 9.6 ­ mS IF Detector Circuit Impedance ­ 8.3 ­ k Input AGC Threshold ­ 5.0 ­ mV Stop­Sense Output Range ­ 2.2 to 4.0 ­ V Audio Output Impedance at 1.0 kHz (Pins 7 and 14) ­ 300 ­ Stereo Indicator Lamp Leakage ­ ­ 1.0 µA Stereo Indicator Saturation Voltage @ 3.0 mA ­ ­ 200 mVdc Oscillator Capture Range ­ ±3.0 ­ kHz 4 MOTOROLA ANALOG IC DEVICE DATA MC13027 MC13027 MC13122 MC13122 Figure 2. MC13122 MC13122 Test Circuit Envelope Det Out I Detector Out Q Detector Out 8.0 V C1 1000 R10 13 k C2 120 L1 1.0 mH 1 2 C3 47 µF 3 C4 450 kHz IF In 10 µF 10 k 100 k 4 5 .01 R5 6 R6 7 U2 C6 1.0 µF Ch2 Out Ch2 Cont Ch2 In Ch1 In Ch1 Cont Ch1 Out 6 8 5 9 4 10 3 11 2 12 1 13 14 THB122 THB122 C28 1000 MC13122 MC13122 IC2 E Det I Det Det In L­R Det 3.0 V Reg AGC IF In SS L Out L Filt In L Filt Ctr L Mat Out R Mat Out R Filt Ctr R Filt In R Out Q Det C27 1000 C22 220 µF 28 27 2.2 k 26 C16 0.47 µF 1000 R26 25 VCC 24 Loop Filt 47 µF 23 C24 Blend 22 Gnd 1.0 k 21 Pilot Ind 3.6 MHz R20 20 Osc Out X1 19 Osc In 18 Pilot Det I 17 Pilot I 16 Pilot Q 15 Audio Blank 22 µF C23 D1 Stereo C A 3.9 k 51 C29 1000 C30 R12 C18 22 µF C31 1.0 µF C17 10 µF 1000 AF Blank SS Out Left Audio Out Right Audio Out C E MOTOROLA ANALOG IC DEVICE DATA 33 k B MPS6515 MPS6515 Q3 R11 Blend Disable 5 MC13027 MC13027 MC13122 MC13122 AMAX STEREO CHIPSET ignitions, using multiple spark coils, along with increased use of plastic in the auto body, have increased the noise energy at the radio. Also, the consumer has learned to expect higher quality audio due to advances in many other media. For the AM band to sustain interest to the consumer, a truly effective noise blanker is required. The block diagram below shows the Motorola AMAX stereo chipset. It offers a two­pronged approach to noise blanking which is believed to be the most effective yet offered in the consumer market. The initial blanking takes place in the output of the mixer, using a shunt circuit triggered by a carefully defined wideband receiver. For most noises, some residual audible disturbance is almost always still present after this process. The disturbance becomes stretched and delayed as it passes through the rest of the selectivity in the receiver. The stretching and delay are predictable, so the MC13027 MC13027 can provide a noise blanking pulse with the correct delay and stretch to the output stages of the MC13122 MC13122 decoder. The MC13122 MC13122 has a Track and Hold circuit which receives the blanking signal from the Front End and uses it to gently hold the audio wherever it is as the pulse arrives, and hold that value until the noise has passed. The combined effect is dramatic. A wide range of types of noise is successfully suppressed and the resulting audio seems almost clean until the noise is so intense that the blanking approaches full­time. The amount of extra circuitry to accomplish noise blanking is relatively small. The external components for this added capability are shown in Figure 3. In the MC13027 MC13027 Front end, the noise receiver/detector requires two capacitors. The presettings for blanking timing and blanking delay require three external fixed resistors. Finally the decoder requires two track and hold capacitors to store the "audio" voltage during the track and hold function. What is AMAX? In 1993, a joint proposal by the EIA (Electronic Industries Association) and the NAB (National Association of Broadcasters) was issued. It included a unified standard for pre­emphasis and distortion for broadcasters as well as a set of criteria for the certification of receivers. The purpose of this proposal was to restore quality and uniformity to the AM band and to make it possible for the consumer to receive high quality signals using the AM band. The FCC has been supportive of this initiative and has required all new broadcast licensees to meet AMAX standards. The NAB and EIA have continued to encourage receiver manufacturers by offering the AMAX certification logo to be displayed on all qualifying radios. This logo is shown below. or The Receiver Criteria An AMAX receiver must have wide bandwidth: 7.5kHz for home and auto, 6.5 kHz for portables. It must have some form of bandwidth control, either manual or automatic, including at least two bandwidth provisions, such as "narrow" and "wide". It must meet NRSC receiver standards for distortion and deemphasis. It must have provisions for an external antenna. It must be capable of tuning the expanded AM band (up to 1700 kHz). And finally, home and auto receivers must have effective noise blanking. All of these requirements, except the noise blanking, have been met by Motorola's previous AM radio products, such as MC13025 MC13025 Front End and the MC13022A MC13022A C­QUAM stereo decoder. It is the Noise Blanker requirement which is met by the two devices on this data sheet, the MC13027 MC13027 and MC13122 MC13122. Noise blanking, especially in AM auto radios, has become extremely important. The combination of higher energy Figure 3. AMAX Stereo Receiver with Noise Blanker MC13027 MC13027 RF In RF Amplifier Mixer MC13122 MC13122 IF Amplifier AGC'd IF Amplifier AM Stereo Decoder Left Track and Hold Variable Notch Filter Right Divide by 4 Pin Diode RF Attenuate 450 kHz Filter Audio Blank Wideband AGC RF Attenuator Switch VCO RF Blank Timer Reset 4.0 V Regulator AGC'd RF Amplifier AM Detector Audio Reject Filter Pulse Detector Delay Timer Audio Blank Timer Audio Blank Switch AGC 6 MOTOROLA ANALOG IC DEVICE DATA MC13027 MC13027 MC13122 MC13122 Figure 4. MC13027 MC13027 Internal Block Diagram WB AGC Out Audio Blank Time Audio Blank Pulse Audio Blank Delay Time IF Out RF Blank Time IF In Gnd2 RF Blank Mixer Out 20 19 18 17 16 15 14 13 12 11 IF Amp AF Time MV AF Del MV VCC Mixer RF Time MV X1 NB Amp ÷4 WB AGC Amp Reg X1 1 2 3 4 5 6 7 8 9 10 WB AGC In Blanker AGC Feedback 4.0 V Reg RF Gnd Mixer In Blanker RF In 4.0 Filter VCC VCO LO Out MC13027 MC13027 FUNCTIONAL DESCRIPTION The MC13027 MC13027 contains the mixer, wide band AGC system, local oscillator, IF pre­amplifier and noise blanker for an AM radio receiver. It is designed to be used with the MC13122 MC13122 to produce a complete AM stereo receiver. The VCO runs at 4 (Fin+FIF) and is divided internally by 4 for the mixer input and local oscillator buffered output. Dividing the VCO reduces the phase noise for AM stereo applications. The noise blanker input is connected in parallel with the mixer input at Pin 6. The noise blanker circuitry contains a high gain amplifier with its own AGC so it remains linear throughout the mixer's linear range. It can detect noise pulses as low as 120 µV and generates three pulses when the noise threshold is exceeded. The width and timing of the blanking pulses is set by the resistors connected to Pins 15, 17 and 19. The resistor on Pin 15 sets the length of the RF blanking pulse and determines the time the transistor on MOTOROLA ANALOG IC DEVICE DATA Pin 12 is "on". The audio blanking pulse delay is set by the resistor on Pin 17 and the width by the resistor on Pin 19. This is necessary because the IF filtering delays and stretches the noise as it arrives at the detector. The transistor on Pin 18 goes "on" to cause noise blanking in the track and hold circuit in the MC13122 MC13122 (Pin 15). Wideband AGC is used in auto receivers to prevent overload ­ it drives the base of a cascode transistor RF amplifier and also a pin diode at the antenna (See Figures 6 and 7). A low gain IF amplifier between Pins 14 and 16 is used as a buffer amplifier between the mixer output filter and IF filter. The input resistance of the IF amplifier is designed to match a ceramic IF filter. The gain of the IF amplifier is determined by the impedance of the load on Pin 16. 7 MC13027 MC13027 MC13122 MC13122 Figure 5. MC13122 MC13122 Internal Block Diagram I Det 28 L­R Det 27 Q Det 26 L­R Loop Filt 24 Audio Blank 15 Q I VCC 25 Blend 23 Gnd 22 Pilot Ind 21 Osc Out 20 Osc In 19 Pilot Det I 18 Pilot I 17 Pilot Q 16 330 VCC VCO 450