MC13155D

ML13155 LANSDALE | Alldatasheet

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Technical content

extended Receive Signal Strength Indicator (RSSI) range.

• 12 MHz Video/Baseband Demodulator
• Ideal for Wideband Data and Analog FM Systems
• Limiter Output for Cascade Operation
• Low Drain Current: 7.0 mA
• Low Supply V oltage: 3.0 to 6.0 V
• Operates to 300 Mhz
• Operating Temperature Range TA = –40 to +85°C SO–16 = -5P PLASTIC PACKAGE CASE 751B (SO–16) CROSS REFERENCE/ORDERING INFORMATION MOTOROLA SO 16 MC13155D ML13155-5P LANSDALEPACKAGE Note: Lansdale lead free ( Pb) product, as it becomes available, will be identified by a part number prefix change from ML to MLE. PIN CONNECTIONS (Top View) Input Decouple VCC1 Output Output VCC2 Limiter Out Quad Coil Input Decouple VEE1 RSSI Buffer RSSI VEE2 Limiter Out Quad Coil SEMICONDUCTOR TECHNICAL DATA MAXIMUM RATINGS Rating Pin Symbol Value Unit Power Supply Voltage 11, 14 VEE (max) 6.5 Vdc Input Voltage 1, 16 Vin 1.0 Vrms Junction Temperature – TJ +150 °C Storage Temperature Range – Tstg – 65 to +150 °C NOTE: Devices should not be operated at or outside these values. The “Recommended Operating Conditions” provide for actual device operation.

Figure 1. Representative Block Diagram NOTE: This device requires careful layout and decoupling to ensure stable operation.

www.lansdale.comPage 2 of 16 Issue A ML13155 LANSDALE Semiconductor, Inc. RECOMMENDED OPERATING CONDITIONS Rating Pin Symbol Value Unit Power Supply Voltage (TA= 25°C) 11, 14 VEE – 3.0 to – 6.0 Vdc –4 0 C TA 85°C 3, 6 VCC Grounded Maximum Input Frequency 1, 16 fin 300 MHz Ambient Temperature Range – TJ – 40 to + 85 °C DC ELECTRICAL CHARACTERISTICS (TA = 25°C, no input signal.) Characteristic Pin Symbol Min Ty p Max Unit Drain Current 11 I11 2.0 2.8 4.0 mA (VEE = – 5.0 Vdc) 14 I14 3.0 4.3 6.0 (VEE = – 5.0 Vdc) 14 I14 3.0 4.3 6.0 Drain Current Total (see Figure 3) 11, 14 ITo t a l 5.0 7.1 10 mA AC ELECTRICAL CHARACTERISTICS (TA = 25°C, fIF = 70 MHz, VEE = – 5.0 Vdc Figure 2, unless otherwise noted.) Characteristic Pin Min Ty p Max Unit Input for – 3 dB Limiting Sensitivity 1, 16 – 1.0 2.0 mVrms Differential Detector Output Voltage (Vin = 10 mVrms) 4, 5 mVp–p (fdev = ± 3.0 MHz) (V EE = – 6.0 Vdc) 470 590 700 (VEE = – 5.0 Vdc) 450 570 680 (VEE = – 3.0 Vdc) 380 500 620 Detector DC Offset Voltage 4, 5 – 250 – 250 mVdc RSSI Slope 13 1.4 2.1 2.8 µA/dB RSSI Dynamic Range 13 31 35 39 dB RSSI Output 12 µA (Vin = 100 µVrms) – 2.1 – (Vin = 1.0 mVrms) – 2.4 – (Vin = 10 mVrms) 16 24 36 (Vin = 100 mVrms) – 65 – (Vin = 500 mVrms) – 75 – RSSI Buffer Maximum Output Current (Vin = 10 mVrms) 13 – 2.3 – mAdc Differential Limiter Output mVrms (Vin = 1.0 mVrms) 7, 10 100 140 – (Vin = 10 mVrms) – 180 – Demodulator Video 3.0 dB Bandwidth 4, 5 – 12 – MHz Input Impedance (Figure 14) 1, 16 @ 70 MHz Rp (V EE = – 5.0 Vdc) – 450 – Ω @ 70 MHz Cp (C2=C15 = 100 p) – 4.8 – pF Differential IF Power Gain 1, 7, 10, 16 – 46 – dB NOTE: Positive currents are out of the pins of the device.

ML13155 LANSDALE Semiconductor, Inc. mately 35 dB range of input level. Figure 2. Test Circuit be discussed and referenced in this section. feedback network at Pins 2 and 15. operating range with the proper decoupling of Pins 2 and 15. significant effect on the wideband response and stability. and at VEE of –3.0 and –5.0 V DC.

ML13155 LANSDALE Semiconductor, Inc. Figure 14. S–Parameter Test Circuit (see Figure 14. S–Parameter Test Circuit).

www.lansdale.comPage 7 of 16 Issue A ML13155 LANSDALE Semiconductor, Inc. S–Parameters (VEE = – 5.0 Vdc, TA = 25°C, C2 and C15 = 0 pF) Frequency Input S11 Forward S21 Rev S12 Output S22 K MAG MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB S–Parameters (VEE = – 5.0 Vdc, TA = 25°C, C2 and C15 = 100 pF) Frequency Input S11 Forward S21 Rev S12 Output S22 K MAG MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB

www.lansdale.comPage 8 of 16 Issue A ML13155 LANSDALE Semiconductor, Inc. S–Parameters (VEE = – 5.0 Vdc, TA = 25°C, C2 and C15 = 680 pF) Frequency Input S11 Forward S21 Rev S12 Output S22 K MAG MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB S–Parameters (VEE = – 3.0 Vdc, TA = 25°C, C2 and C15 = 0 pF) Frequency Input S11 Forward S21 Rev S12 Output S22 K MAG MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB

www.lansdale.comPage 9 of 16 Issue A ML13155 LANSDALE Semiconductor, Inc. S–Parameters (VEE = – 3.0 Vdc, TA = 25°C, C2 and C15 = 100 pF) Frequency Input S11 Forward S21 Rev S12 Output S22 K MAG MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB S–Parameters (VEE = – 3.0 Vdc, TA = 25°C, C2 and C15 = 680 pF) Frequency Input S11 Forward S21 Rev S12 Output S22 K MAG MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB

www.lansdale.comPage 10 of 16 Issue A ML13155 LANSDALE Semiconductor, Inc. Block Diagram of 70 MHz Video Receiver Application Circuit Input – 45 dBm – 70 dBm – 72 dBm – 32 dBm – 47 dBm Minimum Input to Acquire Level: 1.26 mVrms 71 µVrms 57 µVrms 57 µVrms 1.0 mVrms Limiting in ML13155 ML13155 ML13155 40 dB Gain–15 dB (Attenuator) 40 dB Gain 1:4 Transformer 2.0 dB (Insertion Loss) – 25 dB (Insertion Loss) Saw Filter IF Input DC BIASING CONSIDERATIONS The DC biasing scheme utilizes two VCC connections (Pins 3 and 6) and two VEE connections (Pins 14 and 11). VEE1 (Pin 14) is connected internally to the IF and RSSI circuits’ negative supply bus while the VEE2 (Pin 11) is connected internally to the quadrature detector’ s negative bus. Under positive ground operation, this unique configuration offers the ability to bias the RSSI and IF sepa- rately from the quadrature detector. When two ICs are cascaded as shown in the 70 MHz application circuit and provided by the PCB (see Figures 17 and 18), the first ML13155 is used without biasing its quadrature detector, thereby saving approximately 3.0 mA. A total current of 7.0 mA is used to fully bias each IC, thus the total current in the application circuit is approximately 11 mA. Both VCC pins are biased by the same supply. VCC1 (Pin 3) is connected inter- nally to the positive bus of the first half of the IF limiting amplifier, while VCC2 is internally connected to the positive bus of the RSSI, the quadrature detector circuit, and the second half of the IF limiting amplifier (see Figure 15). This distribution of the VCC enhances the stability of the IC. RSSI CIRCUITRY The RSSI circuitry provides typically 35 dB of linear dynamic range and its output voltage swing is adjusted by selection of the resistor from Pin 12 to VEE. The RSSI slope is typically 2.1 µA/dB; thus, for a dynamic range of 35 dB, the current output is approximately 74 µA. A 47 k resistor will yield an RSSI output voltage swing of 3.5 Vdc. The RSSI buffer output at Pin 13 is an emitter–follower and needs an external emitter resistor of 10 k to VEE. In a cascaded configuration (see circuit application in Figure 16), only one of the RSSI Buffer outputs (Pin 13) is used; the RSSI out- puts (Pin 12 of each IC) are tied together and the one closest to the VEE supply trace is decoupled to VCC ground. The two pins are connected to VEE through a 47 k resistor. This resistor sources a RSSI current which is proportional to the signal level at the IF input; typically 1.0 mVms (–47 dBm) is required to place the ML13155 into limiting. The measured RSSI output voltage response of the application circuit is shown in Figure 12. Since the RSSI current output is dependent upon the input signal level at the IF input, a careful accounting of filter losses, matching and other losses and gains must be made in the entire receiver system. In the block dia- gram of the application circuit shown below, an accounting of the signal levels at points throughout the system shows how the RSSI response in Figure 12 is justified. CASCADING STAGES The limiting IF output is pinned–out differentially, cascading is easi- ly achieved by AC coupling stage to stage. In the evaluation PCB, AC coupling is shown, however interstage filtering may be desirable in some application. In which case, the S–parameters provide a means to implement a low loss interstage match and better receiver sensitivity. Where a linear response of the RSSI output is desired when cascad- ing the ICs, it is necessary to provide at least 10 dB of interstage loss. Figure 12 shows the RSSI response with and without interstage loss. A 15 dB resistive attenuator is an inexpensive way to linearize the RSSI response. This has its drawbacks since it is a wideband noise source that is dependent upon the source and load impedance and the amount of attenuation that it provides. A better, although more costly, solution would be a bandpass filter designed to the desired center frequency and bandpass response while carefully selecting the insertion loss. A network topology shown below may be used to provide a bandpass response with the desired insertion loss. 1.0n 0.22µ 1.0n Network Topology

www.lansdale.comPage 11 of 16 Issue A ML13155 LANSDALE Semiconductor, Inc. QUADRATURE DETECTOR The quadrature detector is coupled to the IF with internal 2.0 pF . capacitors between Pins 7 and 8 and Pins 9 and 10. For wideband data applications, such as FM video and satellite receivers, the drive to the the detector can be increased with additional external capacitors between these pins, thus, the recovered video signal level output is increased for a given bandwidth (see Figure 11A and Figure 11B). The wideband performance of the detector is controlled by the loaded Q of the LC tank circuit. The following equation defines the components which set the detector circuit's band- width: Q=RT/XL (1) where: RT is the equivalent shunt resistance across the LC Tank and XL is the reactance of the quadrature inductor at the IF frequency (XL = 2πfL). The inductor and capacitor are chosen to form a resonant LC Tank with the PCB and parasitic device capacitance at the desired IF center frequency as predicted by: fc = (2π √(LCp))–1 (2) where: L is the parallel tank inductor and Cp is the equivalent parallel capacitance of the parallel resonant tank circuit. The following is a design example for a wideband detector at 70 MHz and a loaded Q of 5. The loaded Q of the quadrature detector is chosen somewhat less than the Q of the IF band- pass. For an IF frequency of 70 MHz and an IF bandpass of 10.9 MHz, the IF bandpass Q is approximately 6.4. Example: Let thE external Cext = 20 pF . (The minimum value here should be greater than 15 pF making it greater than the inter- nal device and PCB parasitic capacitance. Cint ≈ 3.0 pF). Cp = Cint + Cext = 23 pF Rewrite Equation 2 and solve for L: L = 198 nH, thus, a standard value is chosen. L = 0.22 µH (tunable shielded inductor). The value of the total damping resistor to obtain the required loaded Q of 5 can be calculated by rearranging Equation 1: RT = Q(2πfl) The internal resistance, Rint between the quadrature tank Pins 8 and 9 is approximately 3200 Ω and is considered in deter- mining the external resistance, Rext which is calculated from: Rext = ((RT)(Rint))/(Rint–RT) Rext = 570, thus, choose the standard value Rext = 560 Ω SA W FILTER In wideband video data applications, the IF occupied band- width may be several MHz wide. A good rule of thumb is to choose the IF frequency about 10 or more times greater than the IF occupied bandwidth. The IF bandpass filter is a SAW filter in video data applications where a very selective response is needed (i.e., very sharp bandpass response). The evaluation PCB is laid out to accommodate two SAW filter package types: 1) A five–leaded plastic SIP package. Recommended part numbers are Siemens X6950M which operates at 70 MHz; 10.4 Mhz 3 dB passband, X6951M (X252.8) which operates at 70 Mhz; 9.2 MHz 3 dB passband; and X6958M which operates at 70 MHz, 6.3 MHz 3 dB pass- band, and 2) A four–leaded TO–39 metal can package. T ypical insertion loss in a wide bandpass SAW filter is 25 dB. The above SAW filters require source and load impedances of 50 Ω to assure stable operation. On the PC board layout, space is provided to add a matching network, such as a 1:4 surface mount transformer between the SAW filter output and the input to the ML13155. A 1:4 transformer, made by Coilcraft and Mini Circuits, provides a suitable interface (see Figures 16, 17 and 18). In the circuit and layout, the SAW fil- ter and the ML13155 are differentially configured with inter- connect traces which are equal in length and symmetrical. This balanced feed enhances RF stability, phase linearity, and noise performance.

ML13155 LANSDALE Semiconductor, Inc. Figure 16. 70 MHz Video Receiver Application Circuit

www.lansdale.comPage 16 of 16 Issue A ML13155 LANSDALE Semiconductor, Inc. OUTLINE DIMENSIONS SO–16 = -5P PLASTIC PACKAGE (ML13155-5P) CASE 751B (SO–16) MIN MIN MAX MAX MILLIMETERS INCHES DIM A B C D F G J K M P R 9.80 3.80 1.35 0.35 0.40 0.19 0.10 5.80 0.25 10.00 4.00 1.75 0.49 1.25 0.25 0.25 6.20 0.50 0.386 0.150 0.054 0.014 0.016 0.008 0.004 0.229 0.010 0.393 0.157 0.068 0.019 0.049 0.009 0.009 0.244 0.019 1.27 BSC 0.050 BSC NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. 751B–03 IS OBSOLETE, NEW STANDARD 751B–04. 1 8 916 P

16 PLD

– K C G M R X 45 F J 8 PL SEATING PLANE 0.25 (0.010) T B AM S S 0.25 (0.010) BM M Lansdale Semiconductor reserves the right to make changes without further notice to any products herein to improve reliabili- ty, function or design. Lansdale does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. “Typical” parameters which may be provided in Lansdale data sheets and/or specifications can vary in different applications, and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by the customer’s technical experts. Lansdale Semiconductor is a registered trademark of Lansdale Semiconductor, Inc.