SL2150KG

SL2150F Front End Power Splitter with AGC Data Sheet Features • Single chip quadruple power splitter (primary channel, secondary channel, OOB channel and loop through) Wide dynamic range on all channels Independent AGC facility incorporated into all channel paths CSO, CTB, CXM all better than -62dBc for +3dBmV agc attack point Full ESD protection. (Normal ESD handling procedures should be observed) DS5535 Issue 2.1 April 2002 Ordering Information SL2150F/KG/LH2S (tubes) SL2150F/KG/LH2T (tape and reel) • • • • • Description The SL2150F is a wide dynamic range single chip power splitter for cable set top box multi-tuner applications. The device offers four buffered outputs from a single input. All signal paths contain an independently controllable AGC facility. Applications • • • Multi-tuner cable set top box and cable modem applications Data communications systems Terrestrial TV tuner loop though AGC1 AGC2 AGC3 AGC4 AGC Control RFOUT1 RFOUT1B AGC Control RFINPUT RFINPUTB Power Splitter AGC Control RFOUT2 RFOUT2B RFOUT3 RFOUT3B AGC Control RFOUT4 RFOUT4B Figure 1 - SL2150F Block Diagram SEMICMF.019 1 SL2150F FROUT1B RFOUT2B RFOUT1 RFOUT2 Data Sheet NC# NC# Vee Vee RFOUT4 RFOUT4B Vcc Vcc Vcc VEE (PACKAGE PADDLE) 1 Vcc Vcc AGC1 RF INPUT RF INPUT AGC2 Vee SL2150F NC# Vee Vee RFOUT3 RFOUT3B NC# AGC4 AGC3 LH28 # Pins marked NC should be connected to Vee Figure 2 - Pin Allocation 1.0 Quick Reference Data NB all data applies with differential termination and single ended source both of 75Ω. Characteristics RF input operating range Conversion gain, with external load as in Figure 12 maximum minimum Input NF, all signal paths at maximum conversion gain IPIP3, all paths IPIP2, all paths CTB* CSO* CXM* Input impedance Input VSWR Output impedance differential, all loops (requires external load for example as in Figure 12) Input to output isolation (all loops) Output to output isolation (all loops) Table 1 - Quick Reference Data *132 channel matrix at +15 dBmV per channel, 75 Ω source impedance, all paths, max gain. Units 50-860 5.5 -25 7 127 151 -66 -64 -66 75 8 440 30 25 MHz dB dB dB dBµV dBµV dBc dBc dBc Ω dB Ω dB dB 2 SEMICMF.019 Data Sheet 2.0 Functional Description SL2150F The SL2150F is a broadband wide dynamic range power splitter with AGC and is optimized for application in multi tuner cable set top box applications. It also has application in any system where a wide dynamic range broadband power splitter is required. The pin assignment is contained in Figure 2 and the block diagram in Figure 1. The port internal peripheral circuits are contained in Figure 15 - "Port Peripheral Circuitry". In normal application the RF input is interfaced to the device input. The input preamplifier is designed for low noise figure, within the operating region of 50 to 860 MHz and for high intermodulation distortion intercept so offering good signal to noise plus composite distortion spurious performance when loaded with a multi carrier system. The preamplifier when combined with the input network shown in Figure 3 - "RF Input Matching Network" provides an impedance match to a 75Ω source. The typical impedance is shown in Figure 4 - "Typical Single-Ended RF Input Impedance with Input Match". The input NF and input referred two-tone intermodulation test condition spectrum are shown in Figure 5 - "Input NF at 25 deg C" and Figure 6 - "Two Tone Intermodulation Test Condition Spectrum, Input Referred" respectively. The output of the preamplifier is then power split to four independently controlled AGC stages. Each AGC stage provides for a minimum of 30 dB of gain control across the input frequency range. The typical AGC characteristic and NF versus gain setting are contained in Figure 7 - "Typical AGC versus Control Voltage Characteristic" and Figure 8 - "Typical Variation in NF versus Gain Setting" respectively. The input referred third order intercept point is independent of gain setting. Finally, each of the AGC stages drive an output buffer of nominal differential output impedance of 440Ω, which provides a nominal 5.5 dB of conversion gain when terminated into a differential 75Ω load. In application it is important to avoid saturation of the output stage, therefore it is recommended that the output standing current be sunk to Vcc through an inductor. A resistive pull up can also be used as shown in Figure 14 "Example Application Driving 200 Ohm Load with Resistive Pull Up", however the resistor values should not exceed 38 ohm single ended. If an inductive current sink is used the maximum available gain from the device is circa 20 dB. This gain can be reduced by application of an external load between the differential output ports. The gain can be approximately calculated from the following formula: GAIN = 20*log ((Parallel combination of 440 ohm and external load between ports) / 44 ohm) + 2dB For example, when driving a 200 ohm load as in Figure 13 - "Example Application Driving 200 Ohm Load with Inductive Pull Up", the gain equals Gain = 20 *log ((440 * 200)/(440+200)/44) +2dB = 12dB. SEMICMF.019 3 SL2150F 1nF 3 Data Sheet RF INPUT SL2150F RFIN F TYPE 5.1nH 1nF 4 RF INPUTB MABAES0029 1:1 Figure 3 - RF Input Matching Network CH1 S11 1 U FS 4_: 133.23 Ω 16 Nov 2001 10:10:47 55.758 Ω 10.44 nH 850.000 000 MHz PRm Cor Avg 16 Smo Z0 75 1_: 169.02 -44.117 50 MHz Ω Ω Ω Ω Ω Ω Ω 2_: 49.916 -57.436 250 MHz 3_: 31.238 -5.5576 500 MHz 4 3 1 2 START 50.000 000 MHz STOP 850.000 000 MHz Figure 4 - Typical Single-Ended RF Input Impedance with Input Match 4 SEMICMF.019 Data Sheet Input NF vs Frequency at 25 deg C (with matching network) 10.0 9.0 8.0 7.0 6.0 NF(dB) 5.0 4.0 3.0 2.0 1.0 0.0 0 100 200 300 400 Frequency (MHz) 500 600 700 SL2150F 800 900 Figure 5 - Input NF at 25 deg C -15dBm INCIDENT POWER FROM 75Ω SOURCE IIM2 -57dBc IIM3 -66dBc -72 dBm -81 dBm df f2-f1 f1-df f1 f2 f2+df Figure 6 - Two Tone Intermodulation Test Condition Spectrum, Input Referred SEMICMF.019 5 SL2150F Typical Variation in Noise Figure vs. Gain Setting 0 0 0.5 1 1.5 2 2.5 3 Data Sheet -10 Back Off from Maximum Gain Setting (dB) -20 -30 -40 -50 -60 -70 AGC Input Voltage (V) Figure 7 - Typical AGC versus Control Voltage Characteristic Typical Variation in NF vs. Gain Setting (with Matching Network) 50.0 40.0 30.0 NF (dB) - 20.0 10.0 0.0 -40.0 -35.5 -30.0 -25.0 -20.0 -15.0 Gain (dB) -10.0 -5.0 0.0 5.0 10.0 Figure 8 - Typical Variation in NF versus Gain Setting 6 SEMICMF.019 Data Sheet SL2150F 132 channel matrix 75 Ohm source, all channels at +15dbmV. Input and output conditions as in Figure 3 - "RF Input Matching Network" and Figure 12 - "Example Application Driving 75 Ohm Load" -50 -55 -60 CSO (dBc) CSO, CTB (dBC) -65 CTB (dBc) -70 -75 --80 -20 -18 -16 -14 -12 -10 -8 -6 -4 -2 -0 Back off from maximum gain (dB) Figure 9 - Typical Variation in CSO and CTB versus Back Off from Maximum Gain Driven output stage C D Directional coupler A B 50 Ω Port 1 Monitored output stage C D Directional coupler phase relationship A C0 D 180 B 0 0 Directional coupler A B 50 Ω Network Analyzer Port 2 Figure 10 - Test Condition for Output Crosstalk SEMICMF.019 7 SL2150F Driven output stage C D Directional coupler A B Port 1 Data Sheet 50 Ω Monitored input stage Network Analyzer Port 2 Directional coupler phase relationship A B C0 0 D 180 0 Figure 11 - Test Condition for Output to Input Crosstalk Vcc 100nF 100pF SL2150F MABAES0029 1:1 1nF To 75Ω load FTYPE Figure 12 - Example Application Driving 75 Ohm Load Vcc 10µH 10µH 1nF SL2150F 200 Ω 1nF Figure 13 - Example Application Driving 200 Ohm Load with Inductive Pull Up 8 SEMICMF.019 Data Sheet Vcc 2x 38 Ω SL2150F 1nF SL2150F Note: External resistor values must not exceed 38Ω 200 Ω 1nF Figure 14 - Example Application Driving 200 O hm Load with Resistive Pull Up Vcc INPUT INPUT DECOUPLED 220 Ω 220 Ω Output 2.5V 1kΩ 270 Ω 3.9V 2.5V 1kΩ 16 mA 16 mA Output Ports 30 kΩ 1.6V 1.5k Ω AGC INPUT RF Input Port AGC Port Figure 15 - Port Peripheral Circuitry SEMICMF.019 9 SL2150F 3.0 Electrical Characteristics Test conditions (unless otherwise stated) T amb = -40o to 85o C, Vee=0V, Vcc=5V+-5%. Data Sheet These characteristics are guaranteed by either production test or design. They apply within the specified ambient temperature and supply voltage unless otherwise stated. Electrical Characteristics Characteristic Supply current Input frequency range Input impedance Input return loss Input Noise Figure 3, 4 50 75 8 8 pin min typ 190 max 228 860 units mA MHz Ω dB dB Tamb=270C, see Figure 8 All loops at maximum conversion gain See Figure 4 Power gain from 75 Ω single ended source to differential 75 Ω load. 4 5.5 -65 7 -25 dB dB dB Vagcip=3.0V Vagcip=0.5V Vagcip=Vee AGC monotonic from Vee to Vcc. Refer to Functional description section for information on calculating maximum gain with other load conditions Assuming ideal power match. See note 2 and Figure 6. Assuming ideal power match. See note 2 and Figure 6. See note 2 and Figure 6. See note 3 and Figure 6. See Figure 4 Conditions Variation in NF with gain adjust Gain -1 dB/dB maximum minimum minimum Input referred IP2 42 dBm Input referred IP3 18 dBm Input referred IM2 -57 -37 dBc dBc 10 SEMICMF.019 Data Sheet Electrical Characteristics (continued) Characteristic Input referred IM3 pin min typ max -66 -46 -62 -64 -64 +4.5 units dBc dBc dBc dBc dBc dBm SL2150F Conditions See note 2 and Figure 6. See note 3 and Figure 6. All gain settings See note 4 and Figure 9. See note 4. See note 4. All gain settings, with load as in Figure 12 - "Example Application Driving 75 Ohm Load" Channel bandwidth 8 MHz within operating frequency range, all loops, all gain settings Differential CSO CTB CXM Input P1dB Gain variation within channel 0.25 dB Output impedance 11,12, 15,16 20,21 24,25 11,12, 15,16 20,21 24,25 6,7 8,9 -150 440 Ω Output port DC standing current 25 mA Standing current that any external load has to sustain. AGC input leakage current Crosstalk between all loop outputs 150 -25 µA dB Vagcip =Vee to Vcc, all control inputs. All gain settings, measured differential output to differential output, driven ports in phase and monitored ports out of phase, see Figure 10 - "Test Condition for Output Crosstalk". All gain settings, measured differential output to single ended input, driven ports in phase, see Figure 11 - "Test Condition for Output to Input Crosstalk" Crosstalk between outputs and RF input -30 dB Note 1: Note 2: Note 3: Note 4: All power levels are referred to 75 Ω a nd 0 dBm = 109 dBµV. Any two tones within RF operating range at -15 dBm, from single-ended 75 ohm source into differential 75 Ω l oad as in Figure 12 - "Example Application Driving 75 Ohm Load", gain setting between maximum and -15dB backoff. Any two tones within RF operating range at -5 dBm, from single-ended 75 ohm source into differential 75 Ω load as in Figure 12 - "Example Application Driving 75 Ohm Load". Load as in Figure 12 - "Example Application Driving 75 Ohm Load" and Figure 13 - "Example Application Driving 200 Ohm Load with Inductive Pull Up", max gain, 132 channel matrix, 75 ohm source with all channels at +15 dBmV, assuming power match. SEMICMF.019 11 SL2150F Absolute Maximum Ratings All voltages are referred to Vee at 0V Characteristic Supply voltage RF input voltage All I/O port DC offsets Storage temperature Junction temperature Package thermal resistance, chip to ambient Power consumption at 5.25V ESD protection 1.5 -0.3 -55 min -0.3 max 6 8 Vcc+0.3 150 125 35 1200 o Data Sheet units V dBm V o o Conditions Differential C C Power applied Paddle to be soldered to ground plane C/W mW kV Mil-std 883B method 3015 cat1 12 SEMICMF.019 Data Sheet 4.0 SL2150F Demonstration Board SL2150F The SL2150F demonstration board is designed to allow testing of device functionality as a stand alone power splitter. It allows for testing of the AGC function and independent testing of all channels. The SL2150F is designed to interface differentially into a silicon tuner such as the SL2101 with simple inductive or resistive pull-ups. However, to facilitate testing the differential, output is converted to a single ended signal through a balun. The differential conversion is necessary for achieving second order performance. All outputs require a DC return path to Vcc to prevent output saturation. This can be provided by the balun, inductive pull up or resistive pull up. In the case of a resistive pull up, the maximum load value is 38 Ω. The balun also provides the DC bias to the outputs; all outputs have to be DC 'shorted' to Vcc to prevent saturation of the output stages. All input and output terminations are 75 Ω. The board schematic and layout are contained in Figure 19 - "Test Board Schematic" and Figure 20 - "Test Board Layout" respectively. Operation note The supply voltage must be connected and enabled before any AGC voltage is applied unless the AGC supplies are current limited to