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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=25C) * 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=25C, 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=330
V3
15.5
18
20.5
dB dB dB mVP-P A/dB A/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=470 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 A
nA
VREG1 ISAT1 ILEAK1 IB1 tr1 tf1 tpdr1 tpdf1
S9 S2
IL=300A 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=1K, 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 A 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=4.7k, 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 SampleHold (For S11 OFFON) SampleHold (For S11 OFFON), 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
sec
12pin
--
1.2
3.0
sec
--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=470, difference to Pin 29 open For input signal OFF/ON For input signal ON/OFF For burst operation For burst operation For MIXIN input (50 LC matching) (50 LC matching) Conditions fin=27.87MHz, -10dBm Min. -- -- -- -- -- -- -- -- -- -- --
(VCC=3.0V, Ta=25C) Typ. 200 -8 145 -380 11 3 30 50 40 40 4.5 Max. -- -- -- -- -- -- -- -- -- -- -- Unit mVP-P dBM dB dB sec sec sec sec V
--10--
CXA1744AR
Electrical Characteristics Measurement Circuit
100
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 100
39
22
23
1000p
MIXOUT MIXIN2 MIXIN1 BUFPAS
RSSIGND
1000p
1000p 0.1
1000p
1000p
1000p
1000p
1000p
S11
1000p
1000p
0.1
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 300A 100k
REGOUT1
S9 1000p 0.1 100
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
0.1
1000p
1000p
0.1
+ +
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
100H
0.1
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
0.4, 4D, x6T 1000p
1000p
100k 1000p 100H
42
19
+
Vcc
44
MULTI
17
84nH 1.8H
45
16
46
47
14
C3 1 30p 100p
COMP1
OPAMP
COMP3
120k
48
1
S1 Vcc
2 3
4
5
6
0.01
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
0.1 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
+25C -20C +75C
-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 x5 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 . The IF amplifier output impedance and limiter amplifier input impedance are approximately 460 . 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

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