CXA1744AR

CXA1744AR IF Amplifier for Digital Cordless Telephone For the availability of this product, please contact the sales office. Description The CXA1744AR is an IF amplifier IC designed for digital cordless telephone of Europe, CT-2. Features • Mixer, RSSI, detector, and various other functions required of a digital cordless phone IF amplifier. • Local oscillator and multiplier for the mixer. • Low power consumption (8.4mA at 3.0V) • Small package (48-pin LQFP). Absolute Maximum Ratings (Ta=25°C) • Supply voltage VCC 14 V • Operating temperature Topr –20 to +75 °C • Storage temperature Tstg –65 to +150 °C • Allowable power dissipation PD 500 mW Recommended Operating Condition • Supply voltage VCC 2.7 to 5.5 48 pin LQFP (Plastic) Structure Bipolar silicon monolithic IC Applications Digital cordless telephone of Europe (CT-2) V 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— E93Z33-TE CXA1744AR Block Diagram and Pin Configuration SAMPLE RSSIVcc MIXVCC IFOUT IFCNT LIMP1 IFP1 36 35 34 33 32 31 30 29 28 27 26 LIMP2 LIMIN IFP2 IFIN 25 37 RSSIGND MIXOUT MIXIN2 MIXIN1 BUFPAS LOIN REF NC MULTIOUT NC NC OSCC OSCB 24 23 22 21 20 19 18 17 16 15 14 13 COMP3 12 SAMPLE COMP1 OPAMP 10 11 COMP2 LIMOUT QDIN RSSIOST RSSIOUT REGOUT1 VCC FCOMPIN FCOMPINX FCOMPOUT VREF CURREF GND 38 LIM IF MIX RSSIOST 40 39 RSSI 43 42 41 44 MULTI REG DET 48 47 46 45 OSC 1 MIXGND 2 PSX 3 DCOMPOUT 4 DCOMPINX 5 DCOMPIN 6 OPOUT 7 OPINX 8 OPIN 9 DETOUT —2— ICOMPOUT ICOMPIN ICOMPINX CXA1744AR Pin Description Pin No. 1 2 Symbol MIXGND PSX Typical pin voltage 0V 0V Equivalent circuit Description GND for the MIX, OSC, and MULTI circuits. Power save control. Power save mode for Low; power save function executes on all circuits except the OSC circuit and a part of the REG circuit. VCC 2 32k 32k GND 3 DCOMPOUT — VCC Data slicer comparator output. 3 GND 4 DCOMPINX — 129 VCC 4 5 DCOMPIN 5 129 Data slicer comparator input. DCOMPINX is for out-of-phase input. DCOMPIN is for in-phase input. GND 6 OPOUT — VCC Operational amplifier output. 6 GND 7 OPINX — 129 VCC 7 Operational amplifier input. OPINX is for out-of-phase input. OPIN is for in-phase input. 8 OPIN 129 8 GND 9 DETOUT 1.25V VCC Detector output. 9 GND —3— CXA1744AR Pin No. 10 Symbol ICOMPIN Typical pin voltage — Equivalent circuit VCC Description Sample-and-hold circuit input. ICOMPIN is for in-phase input. ICOMPINX is for out-of-phase input. 129 10 11 ICOMPINX 11 129 GND 12 ICOMPOUT — VCC Sample-and-hold circuit output. 12 GND 13 14 GND CURREF 0V 1.25V VCC GND for circuits other than the MIX, OSC, MULTI, and RSSI circuits. Adjustment for RSSI output current. Connects a resistor between this pin and GND. 129 14 1.25V GND 15 VREF 1.9V 15 VCC Reference voltage. Leave this pin open normally. 1.25V GND 16 FCOMPOUT — VCC Comparator output for free-channel detection. 16 GND 17 FCOMPINX — 129 17 VCC 18 FCOMPIN 129 18 Comparator input for free-channel detection. FCOMPINX is for out-of-phase input. FCOMPIN is for in-phase input. GND —4— CXA1744AR Pin No. 19 20 Symbol VCC REGOUT1 Typical pin voltage 3.0V 1.25V Equivalent circuit Description Power supply for circuits other than the MIX, OSC, MULTI, and RSSI circuits. Internal bias regulator output. A stabilized bias voltage can be obtained. VCC 129 20 1.25V GND 21 RSSIOUT — RSSIVCC 129 21 RSSI current output. A voltage output is obtained when a resistor is connected between this pin and GND. GND 22 RSSIOST 1.25V RSSIVCC RSSI offset adjustment. The offset amount of RSSI output current can be adjusted by connecting a resistor between this pin and GND. 129 22 1.9V 23 QDIN 2.45V 32k 23 129 RSSIVCC Detector input. Connect a detection discriminator. GND 24 LIMOUT 1.55V RSSIVCC Limiter output. 24 GND 25 RSSIGND 0V GND for the IF amplifier, limiter and RSSI circuits. —5— CXA1744AR Pin No. 26 Symbol LIMP2 Typical pin voltage 1.5V 28 Equivalent circuit RSSIVCC 50k Description Limiter input. Input the signal from IF amplifier to LIMIN. Connect a decoupling capacitor to LIMP1 and LIMP2. 27 LIMIN 27 26 460 50k 28 29 LIMP1 GND IFCNT 0.6V RSSIVCC 129 29 1.9V IF amplifier gain adjustment. Connect a resistor between this pin and GND to compensate for the interstage filter insertion loss between the IF amplifier and limiter. GND 30 RSSIVCC 2.45V + 30 VCC 1.25V GND Power supply for the IF amplifier, limiter and RSSI circuits. Connected to the regulator output internally. Connect a decoupling capacitor. IF amplifier output. 31 IFOUT 1.55V 420 31 RSSIVCC GND 32 SAMPLE 3.0V 50k VCC Sample-and-hold circuit control input. Sample mode for open or High; hold mode for Low. 10k 32 GND 33 34 IFP2 IFIN 1.55V 35 330 34 RSSIVCC 50k IF amplifier input. Input the signal from MIX to IFIN. Connect a decoupling capacitor to IFP1 and IFP2. 35 IFP1 50k 33 GND 36 MIXVCC 3.0V Power supply for the MIX, OSC, and MULTI circuits. —6— CXA1744AR Pin No. 37 Symbol MIXOUT Typical pin voltage 1.4V Equivalent circuit MIXVCC Description Mixer output. 290 37 GND 38 MIXIN2 1.2V 1k 42 MIXVCC 39 MIXIN1 39 38 1.5k 1.5k Mixer RF signal differential input and bias. Connect a decoupling capacitor to REF. 1.25V 42 REF GND 40 BUFPAS 1.75V MIXVCC 40 Mixer local signal input. Connect a decoupling capacitor to BUFPAS. Input the local signal to LOIN. 41 LOIN 41 2k 2k 1.75V GND 44 MULTIOUT — 44 MIXVCC Multiplier current output. Connect a tank circuit between this pin and power supply. GND 47 OSCC — MIXVCC 10k 47 10k 48 OSCB 2.75V 48 DET The Colpitts-type oscillation circuit is composed by connecting a crystal oscillator. Input to the OSCC pin when using an external oscillator. GND —7— CXA1744AR Electrical Characteristics Item (VCC=3.0V, Ta=25°C, refer to the Electrical Characteristics Measurement Circuit) Symbol SW set to ON Measurement conditions For operating VIN7=10MHz, 0dBm S1 For power saving VIN7=10MHz, 0dBm VIN5=150.05MHz, -40dBm Min. Typ. Max. Unit Current consumption 1 ICC I7 6.4 8.4 11.2 mA Current consumption 2 ICC I7 — 0.2 0.5 mA Mixer conversion gain GVMIX VIN6=139.35MHz, -10dBm RL=330Ω V3 15.5 18 20.5 dB Ω dB Ω Ω dB Ω mVP-P µA/dB µA/dB dB dB V mVrms % VP-P V Mixer output resistance IF AMP voltage gain IF AMP input resistance IF AMP output resistance Limiter voltage gain Limiter input resistance Limiter output voltage amplitude RSSI output current inclination (IF) RSSI output current inclination (LIM) RSSI dynamic range RSSI relative precision RSSI output voltage range Detector output voltage Detector total harmonic distortion Detector maximum output voltage Detector output voltage High level Detector output voltage Low level REG1 output voltage COMP1 output saturation voltage COMP1 output leak current COMP1 input bias current COMP1 rise time COMP1 fall time COMP1 rise propagation delay time COMP1 fall propagation delay time COMP1 input dynamic range ROMIX GIF RIIF ROIF GLIM RILIM VLIM VIN3=10.7MHz, -20dBm VIN4=10.7MHz, -30~0dBm VIN3=10.7MHz, -45~-15dBm DRSSI For MIXIN input VIN3=10.7MHz, -80dBm 24pin S10 VIN4=10.7MHz, -60dBm RL=470Ω V2 240 31 240 320 64 340 24pin 320 I8 I8 0.32 0.32 75 — 0.2 330 420 33.5 36 330 420 440 560 66.5 69 460 580 400 480 0.4 0.54 0.4 0.54 80 — — — ±3 1.3 VDET THD VIN3=10.7MHz, -20dBm FMOD=36kHz, fDEV=±25kHz V1 V1 160 — 1.2 VCC -1.1 — 200 240 — — — 3.0 — — — 0.5 V V V µA nA VREG1 ISAT1 ILEAK1 IB1 tr1 tf1 tpdr1 tpdf1 S9 S2 IL=300µA VIN1=1.1V, Isink=5mA 20pin 1.07 1.17 1.27 3pin I1 — — -200 — 3pin — — — 0.35 0.5 — -70 70 40 1.0 — 200 200 S3 S4 Measured value/2 I2 VIN1=DC level 1.3V Rectangular wave of 100kHz, 0.5VP-P RL=1KΩ, CL=20PF nsec nsec nsec nsec V 130 500 160 500 — VCC For Vref=1.3V 0.3 —8— CXA1744AR Item COMP2 output saturation voltage COMP2 output leak current COMP2 input bias current COMP2 rise time COMP2 fall time COMP2 rise propagation delay time COMP2 fall propagation delay time COMP2 input dynamic range OPAMP input bias range OPAMP in-phase input voltage range Symbol ISAT2 ILEAK2 IB2 tr2 tf2 tpdr2 tpdf2 SW set to ON S6 Measurement conditions VIN2=1.1V, Isink=1mA 16pin I5 Min. Typ. Max. — — -200 — 16pin — — — 0.2 — -70 0.4 1.0 — Unit V µA nA nsec nsec nsec nsec V nA V S7 S8 Measured value/2 VIN2=DC level 1.3V Rectangular wave of 100kHz, 0.5VP-P RL=4.7kΩ, CL=20pF I6 300 500 30 500 200 500 170 500 — -70 — VCC — VCC -1.1 VCC -1.1 100 For Vref=1.3V IB VICM Measured value/2 I3 0 -200 0.4 OPAMP output voltage range Sample-and-hold circuit High leak current Sample-and-hold circuit Low leak current Sample-and-hold circuit control voltage High Sample-and-hold circuit control voltage Low Sample-and-hold circuit OFF current time for High output Sample-and-hold circuit OFF current time for Low output S5 Sample→Hold (For S11 OFF→ON) Sample→Hold (For S11 OFF→ON), VS=1.1V 12pin S5 S11 S11 For hold I4 0.4 — V ILEAKH — — nA ILEAKL -100 0.8 X VCC — — — nA — — 0.13 X VCC 3.0 V — V — 1.2 µsec 12pin — 1.2 3.0 µsec —9— CXA1744AR Design Reference Values Item Multiplier output amplitude 3rd order intercepting point RF input impedance S11 real component RF input impedance S11 imaginary component Mixer noise figure IF amplifier voltage gain difference (for adjustment) RSSI rise time RSSI fall time RSSI rise time RSSI fall time Input sensitivity (12 dB SINAD value) Symbol VMLT IP3 fin=150.05MHz fin=150.05MHz SBB conversion RL=470Ω, difference to Pin 29 open For input signal OFF/ON For input signal ON/OFF For burst operation For burst operation For MIXIN input (50Ω LC matching) (50Ω LC matching) Conditions fin=27.87MHz, -10dBm Min. — — — — — — — — — — — (VCC=3.0V, Ta=25°C) Typ. 200 -8 145 -380 11 3 30 50 40 40 4.5 Max. — — — — — — — — — — — Unit mVP-P dBM Ω Ω dB dB µsec µsec µsec µsec µV —10— CXA1744AR Electrical Characteristics Measurement Circuit 100µ VIN4 470 S10 V3 LIMP1 IFOUT SAMPLE RSSIVCC IFCNT LIMP2 IFP1 IFIN IFP2 LIMIN 37 24 1000p 330 MIXVCC 36 35 34 33 32 31 30 29 28 27 26 25 ∗1 1p LIMOUT QDIN 38 51 1000p + VIN5 51 1000p + VIN6 51 1000p + VIN7 100µ 39 22 23 1000p MIXOUT MIXIN2 MIXIN1 BUFPAS RSSIGND 1000p 1000p 0.1µ 1000p 1000p 1000p 1000p 1000p S11 1000p 1000p 0.1µ 33k 40 RSSIOUT 21 1000p 41 LOIN REF 20 42 VCC 19 1000p CXA1744AR 43 NC MULTIOUT 18 44 FCOMPINX 17 45 NC NC DCOMPOUT DCOMPINX DCOMPIN 16 46 VREF ICOMPOUT ICOMPINX DETOUT ICOMPIN 15 47 OPOUT OSCC OSCB PSX OPINX 14 OPIN 48 MIXGND 1 S1 2 S2 3 S3 4 S4 5 6 7 8 9 VS1 10 1.5V 11 1.3V 12 10k 1.5V I3 Audio Measurement Circuit V1 1.3V I2 + 0.3V I4 S5 5mA 20P 1k VIN1 0.3V I1 ∗1 303AC-1941NK (Toko) —11— 13 + V2 VIN3 62 62 + RSSIOST 68k I8 1000p 2k 220p 36k 300µA 100k REGOUT1 S9 1000p 0.1µ 100µ VIN2 1.5V S8 I6 0.3V 1.3V S7 1mA I5 20p I7 3.0V FCOMPIN FCOMPOUT 4.7k S6 CURREF 120k GND Application Circuit ∗3 ∗4 Vcc Vcc R4 1000p 0.1µ 1000p 1000p 0.1µ + + 1000p 36 R3 2k 35 34 33 32 31 30 29 28 27 26 25 37 24 1p 1p S2 2k 50k (33k) 1000p + 1000p 100µH 0.1µ ∗5 C1 7p 38 RFIN + 39 22 1000p MIX IF RSSIOST 23 LIM 21 R2 220p 100k (68k) 1000p R1 50k (36k) RSSI 40 160nH 1000p RSSI 41 20 0.4φ , 4D, ×6T 1000p 1000p 100k 1000p 100µH 42 19 + Vcc 44 MULTI 17 84nH 1.8µH 45 16 46 47 14 C3 ∗ 1 30p 100p COMP1 OPAMP COMP3 120k 48 1 S1 Vcc 2 3 4 5 6 0.01µ 7 8 9 10 11 12 10k 10k 1k 10k 1.3V 360p ∗1 ∗2 ∗3 ∗4 ∗5 MF X'tal 27.87MHz (Asahi) LQN1 84nH (Murata) SFE10.7MHYK (Murata) SFECA10.7MA5 (Murata) 303AC - 1941NK (Toko) Vcc DATAOUT DETOUT CXA1744AR 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. 13 OSC 15 —12— 43 C2 30p 56p 18 COMP2 0.1µ Vcc REG DET ∗2 10k FREE-CH SAMPLE CXA1744AR Mixer input characteristics and 3rd order intercept point Mixer conversion gain frequency characteristics 20 Conversion gain (dB) 0 10 Output level (dBm) -20 0 fLO = fRF -10.7MHz RF input level = -40dBm LO input level = -10dBm -10 -40 10M 100M RF input frequency (Hz) 1000M -60 fLD = 139.35MHz, -10dBm fRF1 = 150.05MHz fRF2 = 150.15 MHz -60 -40 -20 0 RF input level (dBm) Local input level vs. Mixer conversion gain IF amplifier voltage gain frequency characteristics 20 fRF = 150.05MHz -40dBm fLO = 139.35MHz 40 Mixer conversion gain (dB) 0 Voltage gain (dB) 20 IF amplifier input level = -60dBm -20 0 1M -60 -40 -20 0 10M 100M IF amplifier input frequency (Hz) Local input level (dBm) Limiter voltage gain frequency characteristics Detector output frequency characteristics 60 0 Voltage gain (dB) 40 Output level (dB) –20 fLIM = 10.7MHz, -10dBm fDEV = ±25.4kHz 20 Limiter input level = -80dBm 1M 10M 100M Limiter input frequency (Hz) 1k 10k Audio frequency (Hz) 100k —13— CXA1744AR RSSI characteristics 1.4 1.2 33k 29 68k 22 SG 160nH 1000p 39 RSSI output voltage (V) 1.0 21 0.8 0.6 0.4 0.2 -140 220p 36k fRF = 150.05MHz fLO :Built-in OSC used +25°C –20°C +75°C -120 -100 -80 -60 -40 -20 0 RF input level (dBm) DET output characteristics 10 S+D+N 0 Output level (dB) -10 1000p -20 SG 39 160nH -30 -40 fRF = 150.05MHz fDEV = ±25.4kHz -50 fMOD = 36kHz fLO : Built-in OSC used 9 10k 360p DETOUT 10 D+N S+D+N N -50 -40 -30 -20 -10 -120 -110 -100 -90 -80 -70 -60 RF input level (dBm) Supply voltage vs. Current consumption 10 Current consumption (mA) 8 For operating 6 4 2 For power saving 0 2 3 4 Supply voltage (V) 5 6 —14— CXA1744AR Description of Operation • The signals which have been input from Pins 38 and 39 are mixed with the local oscillation signal from the oscillator and multiplier at the mixer, and the frequency-converted signal is output from Pin 37. The oscillator can be self-oscillated by composing the Colpitts-type crystal oscillation circuit between Pins 47 and 48. Also, the external local oscillation signal can be directly input to Pin 47. • After the bandwidth is limited by filter, the mixer output signal is amplified by the IF amplifier and output from Pin 31. The IF amplifier output signal is limited its bandwidth again, and the amplitude is limited by the limiter amplifier and output from Pin 24. The limiter amplifier output signal is phase-shifted by LC resonance circuit and the signal is output from Pin 9 after being quadrature-detected. • The RSSI output is the currents corresponding to the input level at the IF amplifier and limiter amplifier. The current signal can be converted into a voltage signal by connecting a proper I-V conversion circuit to Pin 21. Notes of Operation Take care of the followings because the CXA1744AR has the IF amplifier voltage gain of approximately 34 dB and limiter amplifier voltage gain of approximately 67 dB and uses high frequency. 1. Use as wide pattern as possible for the power supply line and GND, and insert a by-pass capacitor as close to them as possible. 2. Separate the input line from the output line as far as possible and make the wiring short. 3. Ground the decoupling capacitors of mixer (Pins 38, 40 and 42), IF amplifier (Pins 33 and 35) and limiter amplifier (Pins 26 and 28) as close to each pin as possible. Notes on Application 1) Power supply This IC has a built-in voltage regulator so that the supply voltage range is wide (2.7 to 5.5 V) and stable. There are three power supply pins and GND pins (Pins 19, 13 and 36, 1 and 30, 25). Ground a decoupling capacitor as close to each power supply pin as possible. 2) Oscillator The oscillator in this IC varies its current consumption according to the oscillation level. The figures below show how to use the CXA1744AR oscillator. (a) Configuring a Colpitts oscillation circuit. (b) Inputting a local oscillation signal from an external circuit. Input a signal of approximately 0 dBm to stabilize the oscillator operation and reduce the current consumption. (a) (b) VCC VCC 47 48 0dBm 47 48 —15— CXA1744AR 3) Multiplier The ×5 multiplier is provided in this IC for mixer local signal. The fifth-order component of the input signal is extracted by the resonance circuit connected to Pin 44 externally. Wire the resonance circuit as close to Pin 44 as possible. 4) Mixer The CXA1744AR mixer is of double balanced type. Its input is at Pins 38 and 39; when input from Pin 39, Pin 38 should be grounded with a capacitor. 5) 10.7 MHz filter The mixer output impedance and IF amplifier input impedance are approximately 330 Ω. The IF amplifier output impedance and limiter amplifier input impedance are approximately 460 Ω. Use the 10.7 MHz filter with matching. 6) Detector For quadrature FM detection, the phase of the limiter output (Pin 24) is shifted 90° by the RLC parallel resonance circuit or discriminator as the output is input to pin 23. The phase shifter by RLC parallel resonance circuit is shown below. In this case, values of L and C are determined so that the center frequency of the second IF signal and the parallel resonance frequency are equal. As the value of R sets the detector output level, select this value so as to obtain the required output level. With regards to the detector input, the center frequency of the second IF signal and the frequency for the minimum value of the detector distortion does not match because the internal delay is more than the external one. Add the delay circuit as shown below to match the center frequency of the second IF signal and the frequency for the minimum value of the detector distortion. Delay circuit QDIN LIMOUT 23 24 L C R RSSIVCC —16— CXA1744AR 7) RSSI RSSI detects the input signal level, and the current is output in this IC. If the voltage output is necessary, IV conversion should be made by use of a resistor, etc. This IC can compensate for the unevenness of the filter connected between the IF amplifier and limiter amplifier. Pin 29 is used to perform the adjustment so that the line of the RSSI output characteristics is as straight as possible. Also, RSSI offset adjustment pin (Pin 22) is provided in this IC. For example, the RSSI offset amount is adjusted to match the dynamic range used in the next-stage IC. 8) Comparator This IC has three comparators and they are designed according to the following applications. COMP1 performs the waveform shaping of the demodulated audio signal and outputs the resulting signal as a rectangular wave. COMP2 is used to detect the free channel or the signal strength after the RSSI output voltage is input. COMP3 is the current output-type comparator. The COMP3 output can be turned ON/OFF by setting Pin 32 High/Low and this comparator can form a part of a sample-and-hold circuit. The rise time of the demodulated signal during burst operating can be shortened. 9) PSX This is the power save control pin (Pin 2). The power save function is performed by setting this pin Low; the functional blocks except OSC are in the power save mode. —17— CXA1744AR Package Outline Unit : mm 48PIN LQFP (PLASTIC) 9.0 ± 0.2 ∗ 36 37 7.0 ± 0.1 25 24 (8.0) A 48 1 0.5 ± 0.08 + 0.08 0.18 – 0.03 0.1 ± 0.1 + 0.2 1.5 – 0.1 12 13 (0.22) + 0.05 0.127 – 0.02 0.1 0° to 10° 0.5 ± 0.2 NOTE: “∗” Dimensions do not include mold protrusion. DETAIL A PACKAGE STRUCTURE PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE LQFP-48P-L01 QFP048-P-0707 LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY / PHENOL RESIN SOLDER/PALLADIUM PLATING 42/COPPER ALLOY 0.2g —18— 0.5 ± 0.2