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 IF DET SAMPLE COMP1 OPAMP COMP3 1 2 3 4 5 6 7 8 9 10 11 12 OPOUT OPINX OPIN DETOUT ICOMPIN ICOMPINX ICOMPOUT OSC DCOMPIN OSCB REG MULTI DCOMPINX OSCC COMP2 DCOMPOUT NC RSSI PSX NC LIMOUT QDIN RSSIOST RSSIOUT REGOUT1 VCC FCOMPIN FCOMPINX FCOMPOUT VREF CURREF GND RSSIOST MIXGND 39 40 43 MULTIOUT 44 41 NC 45 REF 46 LOIN 47 BUFPAS 48 MIXIN1 42 MIX 24 RSSIGND LIM 23 LIMP2 25 22 LIMIN 26 21 LIMP1 27 20 IFCNT 28 19 RSSIVcc 29 18 IFOUT 30 17 SAMPLE 31 16 IFP2 32 15 IFIN 33 14 IFP1 34 37 35 13 MIXIN2 36 38 MIXOUT MIXVCC Block Diagram and Pin Configuration —2— CXA1744AR Pin Description Pin No. Symbol Typical pin voltage 1 MIXGND 0V 2 PSX 0V Equivalent circuit Description VCC 32k 2 32k 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. GND 3 DCOMPOUT — Data slicer comparator output. VCC 3 GND 4 DCOMPINX — VCC 129 4 5 DCOMPIN 6 OPOUT 129 5 Data slicer comparator input. DCOMPINX is for out-of-phase input. DCOMPIN is for in-phase input. GND — Operational amplifier output. VCC 6 GND 7 OPINX — VCC 129 7 8 Operational amplifier input. OPINX is for out-of-phase input. OPIN is for in-phase input. 129 OPIN 8 GND 9 DETOUT 1.25V VCC 9 GND —3— Detector output. CXA1744AR Pin No. Symbol Typical pin voltage 10 ICOMPIN — Equivalent circuit Description VCC 129 10 11 ICOMPINX Sample-and-hold circuit input. ICOMPIN is for in-phase input. ICOMPINX is for out-of-phase input. 129 11 GND 12 ICOMPOUT — Sample-and-hold circuit output. VCC 12 GND 13 GND 0V 14 CURREF 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 VCC 1.9V Reference voltage. Leave this pin open normally. 15 1.25V GND 16 FCOMPOUT — VCC Comparator output for free-channel detection. 16 GND 17 FCOMPINX VCC — 129 17 18 FCOMPIN 129 18 GND —4— Comparator input for free-channel detection. FCOMPINX is for out-of-phase input. FCOMPIN is for in-phase input. CXA1744AR Pin No. Symbol Typical pin voltage 19 VCC 3.0V 20 REGOUT1 1.25V Equivalent circuit Description VCC 129 Power supply for circuits other than the MIX, OSC, MULTI, and RSSI circuits. Internal bias regulator output. A stabilized bias voltage can be obtained. 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 23 QDIN 1.9V 2.45V RSSIVCC Detector input. Connect a detection discriminator. 32k 23 129 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. Symbol Typical pin voltage 26 LIMP2 1.5V Equivalent circuit Description RSSIVCC 50k 28 27 460 LIMIN Limiter input. Input the signal from IF amplifier to LIMIN. Connect a decoupling capacitor to LIMP1 and LIMP2. 27 50k 26 28 LIMP1 GND 29 IFCNT 0.6V RSSIVCC 1.9V 129 29 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 VCC 2.45V + 30 1.25V Power supply for the IF amplifier, limiter and RSSI circuits. Connected to the regulator output internally. Connect a decoupling capacitor. GND 31 IFOUT 1.55V RSSIVCC IF amplifier output. 420 31 GND 32 SAMPLE VCC 3.0V Sample-and-hold circuit control input. Sample mode for open or High; hold mode for Low. 50k 10k 32 GND 33 IFP2 34 IFIN 1.55V RSSIVCC 50k 35 330 IF amplifier input. Input the signal from MIX to IFIN. Connect a decoupling capacitor to IFP1 and IFP2. 34 35 50k IFP1 33 GND 36 MIXVCC 3.0V Power supply for the MIX, OSC, and MULTI circuits. —6— CXA1744AR Pin No. Symbol Typical pin voltage 37 MIXOUT 1.4V Equivalent circuit Description Mixer output. MIXVCC 290 37 GND 38 MIXIN2 1.2V MIXVCC 1k 42 39 MIXIN1 1.5k 1.5k Mixer RF signal differential input and bias. Connect a decoupling capacitor to REF. 39 1.25V 38 42 REF GND 40 BUFPAS 1.75V MIXVCC 40 41 Mixer local signal input. Connect a decoupling capacitor to BUFPAS. Input the local signal to LOIN. 41 LOIN 2k 2k 1.75V GND 44 MULTIOUT — MIXVCC 44 Multiplier current output. Connect a tank circuit between this pin and power supply. GND 47 OSCC — MIXVCC 10k 10k 47 48 OSCB 2.75V 48 DET GND —7— The Colpitts-type oscillation circuit is composed by connecting a crystal oscillator. Input to the OSCC pin when using an external oscillator. CXA1744AR Electrical Characteristics (VCC=3.0V, Ta=25°C, refer to the Electrical Characteristics Measurement Circuit) Item Symbol Current consumption 1 ICC Current consumption 2 ICC SW set to ON Measurement conditions For operating VIN7=10MHz, 0dBm S1 For power saving VIN7=10MHz, 0dBm Min. Typ. Max. Unit I7 6.4 8.4 11.2 mA I7 — 0.2 0.5 mA V3 15.5 18 20.5 dB 240 330 420 Ω 31 33.5 36 dB VIN5=150.05MHz, -40dBm Mixer conversion gain VIN6=139.35MHz, -10dBm GVMIX RL=330Ω Mixer output resistance ROMIX S10 VIN4=10.7MHz, -60dBm V2 IF AMP voltage gain GIF IF AMP input resistance RIIF 240 330 420 Ω IF AMP output resistance ROIF 320 440 560 Ω Limiter voltage gain GLIM 64 66.5 69 dB Limiter input resistance RILIM 340 460 580 Ω Limiter output voltage amplitude VLIM 24pin 320 400 480 mVP-P RL=470Ω VIN3=10.7MHz, -80dBm VIN3=10.7MHz, -20dBm 24pin RSSI output current inclination (IF) VIN4=10.7MHz, -30~0dBm I8 0.32 0.4 0.54 µA/dB RSSI output current inclination (LIM) VIN3=10.7MHz, -45~-15dBm I8 0.32 0.4 0.54 µA/dB RSSI dynamic range DRSSI For MIXIN input 75 80 — dB RSSI relative precision — — ±3 dB RSSI output voltage range 0.2 — 1.3 V Detector output voltage VDET VIN3=10.7MHz, -20dBm V1 160 Detector total harmonic distortion THD FMOD=36kHz, fDEV=±25kHz V1 — — 3.0 % 1.2 — — VP-P VCC — — V — 0.5 V Detector maximum output voltage Detector output voltage High level 200 240 mVrms -1.1 Detector output voltage Low level — REG1 output voltage VREG1 S9 IL=300µA 20pin 1.07 1.17 1.27 V COMP1 output saturation voltage ISAT1 S2 VIN1=1.1V, Isink=5mA 3pin — V COMP1 output leak current ILEAK1 I1 — — 1.0 µA I2 -200 -70 — nA — 70 200 nsec — 40 200 nsec — 130 500 nsec — 160 500 nsec S3 Measured value/2 COMP1 input bias current IB1 COMP1 rise time tr1 VIN1=DC level 1.3V COMP1 fall time tf1 Rectangular wave of 100kHz, 0.5VP-P COMP1 rise propagation delay time tpdr1 COMP1 fall propagation delay time tpdf1 COMP1 input dynamic range S4 RL=1KΩ, CL=20PF For Vref=1.3V —8— 3pin 0.3 0.35 0.5 — VCC V CXA1744AR Item Symbol SW set to ON COMP2 output saturation voltage ISAT2 S6 COMP2 output leak current ILEAK2 S7 Measurement conditions VIN2=1.1V, Isink=1mA COMP2 input bias current IB2 COMP2 rise time tr2 VIN2=DC level 1.3V COMP2 fall time tf2 Rectangular wave of 100kHz, 0.5VP-P COMP2 rise propagation delay time tpdr2 COMP2 fall propagation delay time tpdf2 S8 RL=4.7kΩ, CL=20pF COMP2 input dynamic range OPAMP input bias range OPAMP in-phase input voltage range Measured value/2 Min. Typ. Max. 16pin — 0.2 0.4 V I5 — — 1.0 µA I6 -200 -70 — nA 16pin For Vref=1.3V IB Measured value/2 I3 VICM OPAMP output voltage range Sample-and-hold circuit High leak current Sample-and-hold circuit Low leak current ILEAKH ILEAKL S5 S11 For hold Sample-and-hold circuit nsec — 30 500 nsec — 200 500 nsec — 170 500 nsec 0 — VCC V -200 -70 — nA 0.4 — 0.4 — — — 100 nA -100 — — nA — — V X VCC Sample-and-hold circuit Sample→Hold OFF current time for High output (For S11 OFF→ON) S5 Sample→Hold (For S11 OFF→ON), VS=1.1V —9— VCC -1.1 VCC -1.1 V V 0.13 — — 12pin — 1.2 3.0 µsec 12pin — 1.2 3.0 µsec control voltage Low OFF current time for Low output 300 500 0.8 control voltage High Sample-and-hold circuit — I4 S11 Sample-and-hold circuit Unit X VCC V CXA1744AR Design Reference Values Item (VCC=3.0V, Ta=25°C) Symbol Min. Typ. Max. Unit — 200 — mVP-P — -8 — dBM fin=150.05MHz — 145 — Ω fin=150.05MHz — -380 — Ω SBB conversion — 11 — dB RL=470Ω, difference to Pin 29 open — 3 — dB RSSI rise time For input signal OFF/ON — 30 — µsec RSSI fall time For input signal ON/OFF — 50 — µsec RSSI rise time For burst operation — 40 — µsec RSSI fall time For burst operation — 40 — µsec Input sensitivity For MIXIN input (50Ω LC matching) (12 dB SINAD value) (50Ω LC matching) — 4.5 — µV Multiplier output amplitude VMLT 3rd order intercepting point IP3 RF input impedance S11 real component RF input impedance S11 imaginary component Mixer noise figure IF amplifier voltage gain difference (for adjustment) Conditions fin=27.87MHz, -10dBm —10— CXA1744AR IFOUT RSSIVCC IFCNT LIMP1 LIMIN RSSIGND 1000p 25 LIMOUT 24 SAMPLE MIXIN1 26 QDIN 23 27 RSSIOST 22 28 RSSIOUT 21 29 IFP2 1000p 30 LIMP2 31 MIXOUT MIXIN2 VIN3 62 1000p 32 IFIN 33k 1000p 0.1µ 1000p 1000p 33 IFP1 S11 1000p S10 470 VIN4 62 1000p 34 38 + 1000p 35 39 1000p 51 MIXVCC 0.1µ 1000p 37 V3 330 + 36 1000p V2 + 100µ Electrical Characteristics Measurement Circuit BUFPAS LOIN 1p 2k 220p 68k 36k I8 300µA 1000p REGOUT1 20 + 1000p 40 1000p 51 41 VIN5 ∗1 100k S9 REF 19 1000p 42 VIN6 VCC 1000p 0.1µ MULTIOUT FCOMPIN I7 1.5V 0.3V I6 17 S8 FCOMPINX 100µ VIN2 18 43 NC 44 CXA1744AR 1.3V NC FCOMPOUT 16 45 S7 DETOUT ICOMPIN ICOMPINX ICOMPOUT 6 7 8 9 10 11 12 I3 Audio Measurement Circuit VIN1 15 20p CURREF 120k GND 10k 1.3V 1.5V VS1 1.5V + 0.3V 1k I1 I2 14 OPIN 5 S4 I5 13 OPINX 4 S3 OPOUT 3 S2 DCOMPIN 2 S1 DCOMPINX PSX 1 20P MIXGND 100µ 0.3V OSCB VIN7 1.3V OSCC DCOMPOUT VREF 5mA + 1000p 47 51 48 46 S6 NC 1mA 4.7k I4 S5 V1 ∗1 303AC-1941NK (Toko) —11— 3.0V 1000p 1000p 1000p 100p C3 1.8µH 84nH 56p 1000p A A A C2 30p ∗1 30p ∗2 0.4φ, 4D, ×6T 160nH A A + 0.1µ 1 36 1000p MULTI MIX 35 34 4 IF 33 5 32 S2 0.1µ 29 7 8 DET LIM 28 50k (33k) RSSIOST 30 RSSI REG 31 + 1000p 1000p 27 25 COMP2 26 S1 Vcc 2 3 Vcc DATAOUT OSC 1k 10k COMP1 1.3V 10k 0.01µ 6 OPAMP 10k 11 DETOUT 10 360p 9 12 COMP3 SAMPLE ∗1 ∗2 ∗3 ∗4 ∗5 120k 0.1µ FREE-CH 10k Vcc RSSI R1 50k (36k) ∗5 MF X'tal 27.87MHz (Asahi) LQN1 84nH (Murata) SFE10.7MHYK (Murata) SFECA10.7MA5 (Murata) 303AC - 1941NK (Toko) Vcc 100µH 100k 2k AA 220p A 1000p 100k (68k) 1000p R2 R3 2k 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. RFIN + C1 7p + 0.1µ AA R4 1000p 41 100µH 1000p Vcc ∗4 1000p 42 43 44 45 46 47 48 Vcc ∗3 37 38 39 40 24 23 22 21 20 19 18 17 16 15 —12— 14 + 13 1p 1p Application Circuit CXA1744AR CXA1744AR Mixer input characteristics and 3rd order intercept point Mixer conversion gain frequency characteristics 20 Conversion gain (dB) Output level (dBm) 0 -20 10 0 -10 fLO = fRF -10.7MHz RF input level = -40dBm LO input level = -10dBm -40 10M 100M 1000M RF input frequency (Hz) -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 fRF = 150.05MHz -40dBm fLO = 139.35MHz 40 Voltage gain (dB) Mixer conversion gain (dB) 20 IF amplifier voltage gain frequency characteristics 0 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 Output level (dB) Voltage gain (dB) 0 40 –20 fLIM = 10.7MHz, -10dBm fDEV = ±25.4kHz 20 Limiter input level = -80dBm 1M 1k 10M 100M Limiter input frequency (Hz) —13— 10k Audio frequency (Hz) 100k CXA1744AR AAAA AAAA AAAA AAAAA AAAA AAAAA AAAAA AAAAA RSSI characteristics 1.4 RSSI output voltage (V) 1000p 33k 1.2 29 39 SG 68k 22 1.0 21 0.8 220p 160nH 36k fRF = 150.05MHz fLO :Built-in OSC used 0.6 +25°C –20°C +75°C 0.4 0.2 -140 -120 -100 -80 -60 -40 -20 0 RF input level (dBm) DET output characteristics AAAAAAAAA AAAAAAAAA AAAAAAAAA AAAAAAAAA 10 S+D+N Output level (dB) 0 -10 1000p -20 39 SG -30 D+N S+D+N 160nH -40 fRF = 150.05MHz fDEV = ±25.4kHz -50 fMOD = 36kHz fLO : Built-in OSC used 9 10 10k N 360p DETOUT -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 RF input level (dBm) Supply voltage vs. Current consumption Current consumption (mA) 10 8 For operating 6 4 2 For power saving 0 2 3 4 Supply voltage (V) —14— 5 6 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 47 0dBm 48 —15— 48 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 L C 24 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 Unit : mm 48PIN LQFP (PLASTIC) 9.0 ± 0.2 ∗ 7.0 ± 0.1 36 25 A 13 48 (0.22) 0.5 ± 0.2 (8.0) 24 37 12 1 + 0.05 0.127 – 0.02 0.5 ± 0.08 + 0.2 1.5 – 0.1 + 0.08 0.18 – 0.03 0.1 0.1 ± 0.1 0° to 10° 0.5 ± 0.2 Package Outline NOTE: “∗” Dimensions do not include mold protrusion. DETAIL A PACKAGE STRUCTURE PACKAGE MATERIAL EPOXY / PHENOL RESIN SOLDER/PALLADIUM PLATING SONY CODE LQFP-48P-L01 LEAD TREATMENT EIAJ CODE QFP048-P-0707 LEAD MATERIAL 42/COPPER ALLOY PACKAGE WEIGHT 0.2g JEDEC CODE —18—