CXA3304N IF IC for ETC Description The CXA3304N is an IF signal processing IC for the ETC car-mounted system which employs the newest bipolar process. Features • Low current consumption 7.8 mA (typ. at VCC=3.0 V) • Small package 16-pin SSOP • 40 MHz IF amplifier • RSSI function • RSSI buffer • Peak hold circuit for carrier detection • Comparator for carrier detection • Comparator for data output waveform shaping • Sleep mode supported Application ETC car-mounted system 16 pin SSOP (Plastic) Absolute Maximum Ratings (Ta=25 °C) • Supply voltage VCC 14.0 V • Operating temperature Topr –30 to +100 °C • Storage temperature Tstg –65 to +150 °C • Allowable power dissipation 300 mW PD Operating Condition Supply voltage VCC 2.5 to 5.5 V Structure Bipolar silicon monolithic IC Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits. —1— E98X40-TE 8 7 6 5 DATA OUT 4 REF IN 3 COMP IN 2 BUFFER OUT 1 RSSI OUT XIF IN IF IN LIM RSSI REF 15 HOLD CAP 16 GND —2— RSSI BIAS 14 POWER SAVE 13 PEAK HOLD COMP1 12 RSSI PEAK 11 VREF PEAK HOLD 10 CARRIER SENSE COMP2 9 VCC Block Diagram and Pin Configuration CXA3304N CXA3304N Pin Description Pin No. Symbol Pin voltage Equivalent circuit Description VCC 1 RSSI OUT — 124 1 2 2 BUFFER OUT 124 — GND RSSI output and RSSI buffer input. The current output is converted to the voltage and it undergoes the waveform shaping by the external resistor and capacitor. The input/output voltage range is between 0.2 V to 1.4 V. Buffer output which outputs the RSSI voltage. VCC 3 COMP IN — 124 3 Comparator input. 124 4 4 REF IN — GND Comparator reference voltage input. VCC 62 5 10 DATA OUT CARRIER SENSE — 5 Comparator output. Open collector. 10 GND VCC Connects the resistor which determines the output current characteristics for the RSSI circuit. 124 6 RSSI REF 0.2 V 6 124 GND —3— CXA3304N Pin No. Symbol Pin voltage Equivalent circuit Description VCC Connects the external capacitor which determines the peak hold time constant. The bias current of the internal buffer circuit flows even in hold mode. 124 7 HOLD CAP — 7 GND 8 9 GND VCC — — Ground. VCC. VCC 11 VREF Input of voltage which is the threshold value of the carrier sense comparator. — 124 11 124 12 12 RSSI PEAK — GND RSSI peak voltage output. This is also connected to the input pin for the carrier sense comparator. VCC 13 PEAK HOLD Peak hold circuit control. Peak hold for low; reset operation for high. — 13 14 14 POWER SAVE 20k (28k) Power saving control. Sleep mode for low; IC operation for high. 80k (120k) — GND VCC IF signal input. It is input with DC coupled. Input the IF signal via a matching circuit. 15 15 16 XIF IN IF IN 0V 1.5k 16 1.5k GND —4— CXA3304N Electrical Characteristics Item Current consumption Current consumption Logic input voltage high level Logic input voltage low level IF limiter input resistance Comparator 1 output saturation voltage Comparator 1 output leak current Comparator 1 output current Comparator 2 output saturation voltage Comparator 2 output leak current Comparator 2 output current RSSI output voltage 1 RSSI output voltage 2 RSSI output voltage 3 RSSI buffer output current + RSSI buffer output current – Peak hold leak current Peak hold charge current Peak hold discharge current Pin 11 input current Pin 13 input current Pin 14 input current (VCC=3 V, Ta=25 °C) Symbol Condition ICC Vin=0 V, Pin 9 current ICCS V14=0 V, Pin 9 current Min. 5.5 — Typ. 7.8 33 Max. 10 100 Unit mA µA Vth — 1 — VCC V Vtl — 0 — 0.35 V Rif DC voltage 1.2 1.5 1.8 kΩ Vst1 I5=640 µA, V3=0.16 V, V4=0.2 V — 0.15 0.4 V Icl1 V5=3 V, V3=0.24 V, V4=0.2 V — 0 5 µA Io1 V5=0.4 V, V3=0.16 V, V4=0.2 V 640 — — µA Vst2 I10=300 µA, V11=0.2 V, V7=0.24 V — 0.1 0.4 V Icl2 V10=3 V, V11=0.2 V, V7=0.16 V — 0 5 µA Io2 V10=0.4 V, V11=0.2 V, V7=0.24 V 300 — — µA Vr1 Vr2 Vr3 Vin=–67 dBm, 40 MHz Vin=–47 dBm, 40 MHz Vin=–17 dBm, 40 MHz 0.2 0.61 1.1 0.35 0.81 1.35 0.5 1.01 1.655 V V V Irs + V1=1.4 V, V2=0.2 V 100 — — µA Irs – V1=0 V, V2=1.4 V 100 130 — µA — 0.05 5 µA 100 220 — µA 100 180 — µA — — — 0.5 17 11 50 50 50 µA µA µA Ipl Ipc Ipd I11 I13 I14 V13=0 V, V1=0.2 V, V7=1.4 V Pin 7 current V13=0 V, V7=0.2 V, V1=1.4 V Pin 7 current V7=1.4 V Pin 7 current V11=0, V7=1.4 V — V14= 1 V Unless otherwise specified, V14=3 V, V13=3 V and V11=3 V. Pin condition Example) V13 : Pin 13 voltage, I5 : Pin 5 current The external constant is the value shown in the Application Circuit. —5— CXA3304N Electrical Characteristics Measurement Circuit VCC 10µ 8 9 0.01µ CARRIER SENSE 470p 7 10 10k PEAK HOLD COMP2 VCC V11 COMP1 RSSI PEAK DATA OUT 5 12 4.7k 100p 4 13 Vhold VCC 6 11 1k 22k 22k RSSI 3 BIAS 14 Vsave 2 15 1000p LIM 5p 1 16 Vin 1000p —6— 2.2k RSSI OUT CXA3304N ICC Application Circuit 10 VCC GND 8 GND GND RSSI REF VCC C9 C8 5 CXA3304N 4 13 R3 S6 C4 1000p 2 15 C3 5p 2.2k C2 820nH L1 1 16 1000p R1 RSSI OUT IF IN C1 C15 GND 0.01µ XIF IN BUFFER OUT 3 14 22k ACTIVE 0.01µ C5 R2 RESET S5 SLEEP 22k C6 PEAK HOLD R4 100p 4.5 to 20pF S1 12 C7 4.7k PEAK HOLD DATA OUT HOLD CAP 7 6 0.01µ POWER SAVE GND OPEN 9 10 11 OPEN BIAS VCC R6 VREF 100k GND 10 OPEN S3 R7 S4 R5 0.01µ 10µ 10k C11 CARRIER SENSE C12 10µ R8 0.01µ C13 C10 1k 10µ RSSI PEAK 470p VCC 0.01µ C14 ICC S2 R9 IF_IN (50Ω) 1 Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. —7— CXA3304N Description of Operation 1) Power supply This IC has a built-in regulator and is designed for stable operation over a wide range of supply voltages from 2.5 to 5.5 V. Wiring to the power supply pin should be decoupled as close to the pin as possible. In addition, the Pin 9 power supply line and the power supply line connected to the comparator output pull-up resistor should be separated as necessary. The IC can also be set to sleep mode to reduce power consumption by controlling Pin 14. Pin 14 voltage Function HI IC operation mode LOW Sleep mode 2) Limiter amplifier This is a differential input type limiter amplifier. The input impedance is approximately 700 Ω. Input the IF signal via a matching circuit. 3) RSSI circuit This circuit outputs a current corresponding to the amplitude of the IF signal input to the limiter amplifier. If the IF signal is the ASK signal, demodulated output is obtained. Connect a resistor to Pin 1 to convert the voltage. Adjusting this resistance value also changes the RSSI output voltage, but the value should be set so that the output voltage is smaller than the supply voltage –1.1 V. The output current includes a component twice the IF signal frequency. Adjust the value of the Pin 1 external capacitor as necessary. Connect a resistor to Pin 6 for determining the temperature characteristics of the RSSI circuit output current. Pin 2 is the RSSI circuit buffer output. The output range is from approximately 0.2 V to the supply voltage 1.1 V. 4) COMP1 circuit This is the comparator circuit for shaping the ASK demodulation signal waveform. The output is an open collector. Connect this circuit to the power supply, etc., via a pull-up resistor. Set the connected power supply to the Pin 9 potential or lower. —8— CXA3304N 5) Peak hold circuit This circuit holds the Pin 1 RSSI output voltage peak. Peak hold operation and reset operation are switched with Pin 13. Peak hold operation The input RSSI voltage is held by the Pin 7 capacitor. The held voltage passes through the buffer circuit and is output to Pin 12. The response characteristics during peak hold operation are determined by the peak hold charge and leak currents, which are determined inside the IC, and the Pin 7 capacitance value. The held voltage fluctuates according to the peak hold leak current. This fluctuation becomes larger as the capacitor value is set smaller. Adjust the reset operation interval and the capacitor value as necessary. In addition, the hold time can also be shortened by connecting a resistor between Pin 7 and GND. Reset operation The charge held by the Pin 7 capacitor is discharged according to the peak hold discharge current which is determined inside the IC. The discharge time changes according to the capacitor value. Pin 13 voltage Function HI Reset LOW Peak hold 6) COMP2 circuit This is the carrier sense comparator circuit. The input pin is connected internally to the RSSI PEAK output (Pin 12). Apply the voltage to be used as the threshold value to Pin 11. The comparator output is an open collector output, and should be connected to the power supply, etc., via a pull-up resistor. Set the connected power supply to the Pin 9 potential or lower. —9— CXA3304N Example Representative Characteristics Active mode current consumption (P9) Active mode current consumption (P9) [mA] VCC (P9)=3V, POW_SAVE (P14)=1V 8.1 8.0 7.9 7.8 7.7 7.6 2.5 3.0 3.5 4.0 4.5 5.0 5.5 Supply voltage [V] Power saving mode current consumption (P9) Power saving mode current consumption (P9) [µA] VCC (P9)=3V, POW_SAVE (P14)=0.35V 80 60 40 20 0 2.5 3.0 3.5 4.0 4.5 Supply voltage [V] —10— 5.0 5.5 CXA3304N RSSI output characteristics VCC (P9)=3V, IF=40MHz CW 1.6 1.4 RSSI_OUT (P1) voltage [V] 1.2 1.0 0.8 0.6 0.4 0.2 0 –80 –70 –60 –50 –40 –30 –20 –10 0 IF input power [dBm] RSSI output temperature characteristics VCC (P9)=3V, IF=40MHz CW 1.6 1.4 RSSI_OUT (P1) voltage [V] 1.2 1.0 0.8 0.6 0.4 : –30°C : 25°C : 100°C 0.2 0 –80 –70 –60 –50 –40 –30 IF input power [dBm] —11— –20 –10 0 10 CXA3304N Package Outline Unit : mm 16PIN SSOP (PLASTIC) + 0.2 1.25 – 0.1 ∗5.0 ± 0.1 0.1 16 9 1 6.4 ± 0.2 ∗4.4 ± 0.1 A 8 + 0.05 0.15 – 0.02 0.65 + 0.1 0.22 – 0.05 0.13 M 0.5 ± 0.2 0.1 ± 0.1 0° to 10° DETAIL A NOTE: Dimension “∗” does not include mold protrusion. PACKAGE STRUCTURE PACKAGE MATERIAL EPOXY RESIN SONY CODE SSOP-16P-L01 LEAD TREATMENT SOLDER / PALLADIUM PLATING EIAJ CODE SSOP016-P-0044 LEAD MATERIAL 42/COPPER ALLOY PACKAGE MASS 0.1g JEDEC CODE NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). —12—