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CXA3176N
IF Amplifier for FM Receiver (AFC Supported)
Description The CXA3176N is a low current consumption FM IF amplifier which employs the newest bipolar process. It is suitable for FM receiver using AFC. Features * Low current consumption : 0.95 mA (typ. at VCC1=1.4 V) 0.15 mA (typ. at VCC2=3.0 V) * Small package 24-pin SSOP * Second mixer and oscillator * Needless of IF decoupling capacitor * Reference power supply for operational amplifier * RSSI function (dynamic range of 70 dB) * IF input, VCC standard * AFC function * Maximum input frequency : 30 MHz Applications * FM receiver supporting AFC * Double conversion FM receiver Structure Bipolar silicon monolithic IC Block Diagram and Pin Configuration
REG CONT REG OUT CHARGE AMP_OUT LVA OUT MIX IN AUDIO
24 pin SSOP (Plastic)
Absolute Maximum Ratings * Supply voltage VCC * Operating temperature Topr * Storage temperature Tstg * Allowable power dissipation PD Operating Condition Supply voltage
7.0 -20 to +75 -65 to +150 417
V C C mW
VCC1 VCC2
1.1 to 4.0 2.5 to 4.0
V V
VCC2
B.S.
24
23
22
21
20
19
18
17
16
15 22dB
14
13
GND REG MIX OSC
LVA RSSI AFC IF_LIM QUAD_DET FILTER
x4
1
OSC IN
2
OSC OUT
3
MIX OUT
4
VCC1
5
IF IN
6
AFC
7
AFC_C
8
QUAD
9
C1
10
11
12
C2
C3
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--
RSSI_C
RSSI
GND
NC
E96X14A8Z
CXA3176N
Pin Description Pin No. 1 Symbol Pin voltage 1.4 V
1
72 15k
Equivalent circuit
VCC 300
Description
OSC IN
15k
2
2
OSC OUT
0.7 V
GND VCC 1.5k
Connects the external parts of crystal oscillator circuit. A capacitor and crystal oscillator are connected to these pins and VCC.
3
3
MIX OUT
1.3 V
Mixer output. Connect a 450 kHz ceramic filter between this pin and IF IN.
GND
4
VCC1
1.5k 20k 20k VCC 1.5k
Power supply 1.
5
IF IN
1.4 V
5
IF limiter amplifier input.
GND
6
AFC
--
VCC
AFC output.
6 7
GND
7
AFC_C
--
Connects the capacitor that becomes the AFC time constant.
--2--
CXA3176N
Pin No.
Symbol
Pin voltage
Equivalent circuit
VCC 20k 22k
Description
8
QUAD
1.4 V
8
20p GND VCC
Connects the phase shifter of FM detector circuit.
9 10 11
C1 C2 C3
0.2 V
9
35k 10 11 GND
Connects the capacitor that determines the LPF cut-off.
12
RSSI_C
0.1 V
VCC
Connects the capacitor that determines the RSSI rising characteristics.
12 13
GND
13
RSSI
0.1 V
RSSI circuit output.
VCC
14
AMP OUT
VCC2/2
14
Output for the detector output amplification circuit.
GND
15
NC
--
VCC
Not connected.
16
AUDIO
0.2 V
16
Input for the detector output amplification circuit and AFC circuit. The filter circuit output is connected.
GND
--3--
CXA3176N
Pin No.
Symbol
Pin voltage
17
Equivalent circuit
Description
72 20k
17
B.S.
--
140k GND
Controls the battery saving. Setting this pin low suspends the operation of IC. (Applied voltage range : -0.5 V to +7.0 V)
20k 18
18
CHARGE
--
100k
GND
Controls the time constant of the AFC circuit. Set this pin high to make the short time constant. (Applied voltage range: -0.5 V to +7.0 V) Power supply 2.
19
VCC2
--
20 72
20
LVA OUT
--
GND VCC
LVA comparator output. It is open collectors. (Applied voltage range: -0.5 V to +7.0 V)
21
REG CONT
72
--
21
Output for internal constant-voltage source amplifier. Connect the base of PNP transistor. (Current capacity : 100 A)
GND VCC
22
REG OUT
1.0 V
78k 22 1k 22k GND
Constant-voltage source output. Controlled to maintain 1.0 V.
23
GND
--
VCC 2k 4.16k 4.16k
Ground
24
MIX IN
1.4 V
24
Mixer input.
GND
--4--
CXA3176N
Electrical Characteristics (VCC1=1.4 V, VCC2=3 V, Ta=25 C, FS=21.7 MHz, FMOD=4 kHz, FDEV=4.5 kHz, AMMOD=30 %) Item Current consumption1 Current consumption2 Current consumption AM rejection ratio VB output current VB output saturation voltage REG OUT voltage LVA operating voltage LVA output leak current LVA output saturation voltage Logic input voltage high level Logic input voltage low level Limiting sensitivity RSSI output offset Mixer input resistance Mixer output resistance IF limiter input resistance AMP OUT Symbol ICC1 ICC2 ICCS AMRR IOUT VSATVB VREG VLVA ILLVA VSATLVA VTHBSV VTLBSV VIN (LIM) VORSSI RINLIM ROUTMIX RINLIM VAMP Conditions Measurement circuit 1, Measurement circuit 1, Measurement circuit 1, Measurement circuit 2, Measurement circuit 3 Measurement circuit 3 Output current 0 A Measurement circuit 4, V1=1.4 to 1.0 V Measurement circuit 4, Measurement circuit 5 -- -- Measurement circuit 2, Data filter fc=6.2 kHz Measurement circuit 6 -- -- -- Measurement circuit 2 V2=1.0 V V2=1.0 V V2=0 V 30 k LPF Min. 0.5 -- -- 25 100 -- 0.92 1.00 V1=1.0 V -- -- 0.9 -- -- -- 1.6 1.2 1.2 500 Typ. 0.95 0.15 6 -- -- -- 0.97 1.05 -- -- -- -- -108 150 2.0 1.5 1.5 630 Max 1.35 0.25 10 -- -- 0.4 1.02 1.10 2.0 0.4 -- 0.35 -- 300 2.4 1.8 1.8 800 Unit mA mA A dB A V V V A V V V dBm mV k k k
mVrms
--5--
CXA3176N
Electrical Characteristics Measurement Circuit
Vin V3 3.0V 10p to 120p V2 18 17 16 15 14 13 1000p 24 23 22 21 20 19 18 17 16 15 14 13
1.8
A
24 23 22 21 20 19
V3 3.0V
V2 1.0V
V
1
2
3
VCC
4
5
6
7
8
9
10
11
12
1 A
V1 1.4V
2
22p
3
4
5
6
7
8
9
10
11
12
V
V4 15p VCC V1 1.4V 1 5.6k
1200p 1200p
14 11
1200p
Measurement circuit 1
Measurement circuit 2
100A V3 0.5V V3 3V
GND
A V
V2 1.0V 24 23
V
100k 22 21 20 19
V3 3V
V2 1.0V
24
23
22
21
20
19
18
17
16
15
14
13
18
17
16
15
13
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
12
VCC GND
V1 1.4V
VCC
V1 1.4 to 1.0V
Measurement circuit 3
Measurement circuit 4
50A
V
V3 3V
V2 1.0V 24 23 22 21 20 19
V3 3V
V2 1.0V
V
15 14 13
18
17
16
24
23
22
21
20
19
18
17
16
15
14
13
1 1 2 3 4 5 6 7 8 9
10 11 12
2
3
4
5
6
7
8
9
10
11
12
VCC VCC V1 1.4V
V1 1.4V
100p
Measurement circuit 5 --6--
Measurement circuit 6
Application Circuit
VCC2 AMP_OUT RSSI
13 22dB 12
REG
LVA
GND
P7
P6
P5
C9
10
C2 GND GND
PNP
C6
L1
10
R4
1.8H C3
1000P
GND GND
100k
RF SMA
10P to 120P
0.01
C10
GND 24 VB_REG BS 23 22 21 20 19 18 17 16 15
S2
S1
AUDIO
C5
R5 1
15P
5.6K
XTAL
DISK
C4
C11
470P
CERAFIL
GND GND
C12 470P
C13 470P
GND
VCC
P1
C7
10
0.01
C8
CXA3176N
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.
AFC
GND
P2
C14 100P
GND
C15
--7--
GND REG MIX OSC IF_LIM AFC LVA x4
QUAD_DET FILTER
1
22P
2
3
4
5
6
7
8
9
10
P4
14
RSSI
11
P3
CXA3176N
Application Notes 1) Power Supply The CXA3176N, with built-in regulator, is designed to permit stable operation at a wide range of supply voltage of VCC1=1.1 to 4.0 V and VCC2=2.5 to 4.0 V. Decouple the wiring to VCC (Pins 4 and 19) as close to the pin as possible. 2) Oscillator Input Oscillator input method a) Using Pins 1 and 2, input a self-excited oscillation signal through the composition of a Colpitts type crystal oscillator circuit. b) Directly input a local oscillation signal to Pin 1.
1 1
VCC
2
3
Ceramic filter
2
3
Ceramic filter From local signal
Fig. 1 3) Mixer The mixer is of double-balance type. Pin 24 is the input pin. Input though a suitable matching circuit. The input impedance is 2.0 k. Pin 3 serves as the output pin for the mixer, and a load resistance of 1.5 k is incorporated. 4) IF Filter The filter to be connected between this mixer output and the IF limiter amplifier input should have the following specifications. I/O impedance : 1.5 k 10 % Band width : Changes according to applications. 5) IF Limiter Amplifier The gain of this IF limiter amplifier is approximately 100 dB. Take notice of the following points in making connection to the IF limiter amplifier input pin (Pin 5). a) Wiring to the IF limiter amplifier input (Pin 5) should be as short as possible. b) As the IF limiter amplifier output appears at QUAD (Pin 8), wiring to the ceramic discriminator connected to QUAD should be as short as possible to reduce the interference with the mixer output and IF limiter amplifier input.
3 4 5 6 7 8 9
VCC
Wire as short and apart as possible
As short as possible
Fig. 2 --8--
CXA3176N
6) Quick Charge In order to hasten the rise time of Pin 7 from when power is turned on, the CXA3176N features a quick charge circuit. The capacitance value connected to Pin 7 should be chosen such that the voltage does not vary much due to discharge during battery saving. Connect a signal for controlling the quick charge circuit to Pin 18. Setting this pin high enables the quick charge mode, and setting this pin low enables the steady-state reception mode. Quick charge is used when the power supply is turned on. The battery saving must be set high at the time. Connect Pin 18 to GND when quick charge is not being used.
Timing Power supply (Pin 4) Quick charge (Pin 18) Battery saving (Pin 17) H L H L active battery saving 5ms 1ms 1ms
Fig. 3
7) Detector The detector is of quadrature type. To perform phase shift, connect a ceramic discriminator to Pin 8. The phase shifting capacitor for the quadrature detector is incorporated. The FM signal demodulated with the detector will be output to AMP_OUT (Pin 14) through the internal LPF. The CDBC450CX50 (MURATA MFG. CO., LTD.) ceramic discriminator is recommended for the CXA3176N.
7
8
9
5.6k Ceramic discriminator CDBC450CX50 VCC
Fig. 4
--9--
CXA3176N
8) REG CONT Controls the base bias of the external transistors. 9) LVA OUT This pin goes high (open) when the supply voltage becomes lower. Since the output is an open collector, it can be used to directly drive the CMOS device. The setting voltage of the LVA is 1.05 V (typ.), and it possesses a hysteresis with respect to the supply voltage. The hysteresis width is 50 mV (typ.). 10) B.S. Operation of the CXA3176N can be halted by setting this pin low. This pin can be connected directly to the CMOS device. The current consumption for battery saving is 10 A or less (at 1.4 V).
B.S. 17
Fig. 5 11) Control Pins The function controls are as shown below. Pin No. 17 Symbol B.S. Battery saving Function mode control Input high IC operation Input low Sleep
18 CHARGE Pin 7 charge speed control Quick charge Slow charge
Note) When each function is not controlled externally, set it to the state with an asterisk (). 12) LPF Constant The composition of the data filter is ternary. The first-stage cut-off fC1 is fC1 = 1 2C12R
The second-stage cut-off fC2 is fC2 = 1 2RC13 C14 , Q= C13 C14
C12, C13, C14 : R:
External capacitance shown in the Application Circuit IC internal resistance
The Butterworse characteristic is for C12=C13=C14. R is approximately 55 k 20 %. --10--
CXA3176N
13) AFC The AFC is of the current output type which outputs the frequency deviation in the form of the current and converts it to the voltage. The output current range is approximately 0.4 A for the slow mode and 70 A for the fast mode.
External parts Vin (S curve voltage) LPF Vref C Vref Vout (AFC voltage) RF
BUF
V=it/C
1st OSC for 1st MIX for FM receiver FM receiver x4
7
6
VCO
To CXA3176N
Vref
CXA3176N AFC Principle Diagram The Pin 7 voltage V continues to change till the Vin value reaches the Vref value. When these values are equal, the Pin 7 output current becomes "0" and the voltage is determined by the charge and time. The Pin 7 voltage V is output to Pin 6 through the amplifier. Vout=Vref+4 (V-Vref) The Vout operating range is 0.4 V to 4 (VCC-0.2) V so that AFC should be set within this range. Also, the voltage for Pin 7 is undefined with the IC itself. The AFC voltage varies, for example, as shown below by the VCO characteristics. The AFC voltage follows the VCO characteristics because this voltage is independent of the slope of the S curve. In other words, the CXA3176N operates according to the VCO characteristics when the VCO characteristics have the linearity with respect to the voltage and the VCO characteristics can be controlled within the range shown in the graph below.
4 (VCC-0.2)V
A B
Pin 6 voltage
C 0.4V fo Input frequency
--11--
CXA3176N
14) Sensitivity Adjustment Method The constants shown in the Application Circuit are for the standard external parts. However, adjustment may be necessary depending on the conditions of use, characteristics of external parts, and the RF system circuit and decoder connected to the IF IC, etc. Adjust the sensitivity according to the following procedures. a) MIX IN matching When using a matching circuit between the RF system circuit and MIX IN of the CXA3176N, adjust the trimmer to obtain the optimal sensitivity while monitoring the AUDIO output. b) Local input level The mixer circuit gain is dependent on the local signal input level to OSC IN. The input level to OSC IN should be set as high as possible within the range of -6 to +2 dBm as shown in the graph of "Local input level vs. Mixer gain characteristics". However, care should be taken as raising the input level above +2 dBm will cause the sensitivity to drop. When creating the local signal using the internal oscillator circuit, the oscillation level varies according to the external capacitances attached to Pins 1 and 2 and the characteristics of the used crystal. Therefore, be sure to adjust the external capacitance values attached to Pins 1 and 2 according to the crystal characteristics.
OSC
1
C1 VCC
2
C2
C1 and C2 have the following range in the figure above. C1 C2 C1 = C2 to C1 =5C2 As for the ratio of C1 to C2, the oscillation stabilizes as C1 approaches equality with C2. The oscillation level decreases as the C1 and C2 values become larger, and increases as the C1 and C2 values become smaller. Use a FET probe to confirm the local input level. c) LPF constant (when the CXA3176N is used for the pager) The data filter cut-off may need to be changed depending on the characteristics of the connected decoder. Adjust the capacitance values of Pins 9 to 12 while checking the incoming sensitivity including the decoder. If the capacitance values are too large, the detector output waveform will deviate at high data rates, causing the sensitivity to drop. Conversely, if the capacitance values are too small, the LPF will be easily affected by noise, causing the sensitivity to drop. Adjust capacitance values of Pins 9 to 12 so that the capacitance value described in "12) LPF Constant" becomes smaller. --12--
CXA3176N
d) AFC The CXA3176N uses the AFC to correct the IF frequency deviation. WHen the IF frequency deviation amount is large, correction takes time and may lower the sensitivity. Adjust the oscillator frequency of the local oscillator so that the center frequency of the signal input to Pin 5 (IF IN) is as close to 450 kHz as possible.
15) CXA3176N Standard Board Description * Outline This board contains the external parts shown in the Application Circuit in order to evaluate the CXA3176N operation * Features The following CXA3176N basic operations can be checked. 1) Battery saving and other mode switching 2) AFC pin 3) The RSSI pin output is the low impedance because it is output via the buffer. * Method of use 1) Input the CXA3176N supply voltage VCC1=1.4 V and VCC2=3 V. This IC operates with a single power supply. 2) The CXA3176N uses a 21.245 MHz crystal. Input the RF signal from the RF pin and use this IC in the condition where IF=450 kHz. 3) The AFC pin voltage is undefined with the IC itself because the current output circuit is employed for the AFC. For the evaluation, be sure to apply the bias externally to the AFC pin or to make the AFC loop. 4) Set the mode switches. * Mode switch setting Mode switches S1 and S2 are provided in two locations in the board. Each basic operation can be confirmed by switching these mode switches while referring to the board layout. See the table in "11) Control Pins" for the mode switching. * Device specification See these specifications for the IC specifications. The ICs for this evaluation board are ES specification. * Circuit diagram The circuit diagram is the same as the Application Circuit in these Specifications.
--13--
CXA3176N
15) -1. [Board Layout]
VCC
GND
VCC2 GND
ON
ON
PNP
RF
S2
24 XTAL
13
OFF
S1
OFF DISK
1
12
GND
3176 EVALUATION BOARD
15) -2. [Mode Switch Pattern]
ON Low
CERAFIL
Slow
ON Low
Sleep
S2
High OFF < CHARGE >
Quick
S1
High OFF < B.S. >
Active
--14--
CXA3176N
15) -3. List of Standard Board Parts Value Part # Remarks (Manufacture) Note
Resistor 5.6 k 100 k Capacitor 6.8 P to 45 P 15 P 22 P 100 P 470 P 1000 P 0.01 C2 C5 C4 C15 C12 C13 C14 C3 C8 C10 C11 C6 C7 C9 TZ03P450FR169 (MURATA PRODUCTS) DD100 series temperature characteristics type B (MURATA PRODUCTS) TRIMMER CAPACITOR R5 R4 (RIVER) E12 series 1/8W
CERAMIC CAPACITOR E12 series (high dielectric constant type)
1
10
RPE131F103Z50 (MURATA PRODUCTS) 25 V 1 (SHIN-EI TUSHIN KOGYO CO., LTD.) 25 V 10 (SHIN-EI TUSHIN KOGYO CO., LTD.)
MONOLITHIC CERAMIC CAPACITOR RPE series
ELECTROLYTIC CAPACITOR E6 series
Inductor 1.8 H L1 EL0405 (TDK Products) E12 series 2.5 mm pitch (Lead Pitch)
Active Component PNP 2SA1015 (TOSHIBA CORPORATION) Vceo Ic Pc Hfe fc -50 V -150 m 400 m 70 to 400 80 M
Crystal 21.245 MHz XTAL NR-18BN (NIHON DEMPA KOGYO CO., LTD.)
Ceramic Filter CERAFIL CFWS450D (MURATA PRODUCTS) 450 kHz 1.5 k
Ceramic Discriminator DISC CDBC450CX50 --15-- (MURATA PRODUCTS) 450 kHz
CXA3176N
Switch S1 S2 ATE1D-2M3-10 (FUJISOKU CORPORATION) AC/DC AC/DC ON-ON (1 poles) 48 V 50 mA 20 mA 1 A Max. Min.
Connector RF HRM300-25 (HIROSE ELECTRIC CO., LTD.) SMA CONNECTOR
Pin x5 x6 Mac 8 test pin ST-1-3 (Mac eight) Mac 8 test pin LC-2-G (Mac eight) L=10 mm 0.8
--16--
CXA3176N
Example of Representative Characteristics
Current consumption characteristics 1.2 ICC2 (at VCC1 1.4V)
1.1 ICC1 (at VCC2 3.0V) 1.0 0.13
0.9 0.12 0.8 0 1.0 2.0 3.0 4.0
Supply voltage (V) Mixer input audio response and RSSI characteristics 0 10 S VCC2 3.0V RF 21.7MHz VCC1 1.4V fDEV 4.5kHz fMOD 4kHz
ICC2 (Pin 19) current (mA)
ICC1 (Pin 4) current (mA)
Audio response (dB)
20 10P to 120P 1000P 24 1.8 S/N
Lo 21.25MHz 0dBm 0dB=630mVrms T=25C
1000
30
40
RSSI 500
50
60 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 0
RF input level (dBm) Local input level vs. Mixer gain characteristics 10 VCC1 1.4V VCC2 3.0V
Mixer gain (dB)
RF 21.7MHz -60dBm 0 Lo 21.25MHz With IF filter load -10 Mixer gain is the level difference between Pin 3 and Pin 24
-20
-10 Local input level (dBm)
0
--17--
RSSI output voltage (mV)
CXA3176N
Mixer input frequency vs. Gain characteristics
1.0
Mixer gain (dB)
0 VCC2 3.0V VCC1 1.4V RF -60dBm Lo (RF -0.45) MHz 0dBm -10 1M 10M Pin 24 input frequency (Hz) Mixer I/O characteristics and 3rd-order intercept point 0 VCC1 1.4V VCC2 3.0V fo 21.7MHz f1 21.725MHz f2 21.75MHz fo Lo 21.25MHz -40 with IF filter load 0dBm 100M
-20
Pin 3 output level (dBm)
f1 + f2 -60
-80
-60
-40
-20
0
Pin 24 input level (dBm) Cut-off characteristics of audio filter 0 VCC1 1.4V VCC2 3.0V -10
Response (dB)
-20
-30
-40
-50
-60 100 1k Input frequency (Hz) 10k
--18--
CXA3176N
S curve characteristics
Pin 16 voltage (mV)
300 VCC1
4.7k
8
VCC1 1.4V VCC2 3V IF -40dBm
CDBC 450 CX50 (MURATA MFG. CO., LTD) 200
5
50
100 440 445 450 Pin 5 input frequency (kHz) RSSI output voltage temperature chatacteristics 1000 ... 75C ... 25C ... -20C 25C 455 460
Pin 13 voltage (mV)
10P to 120P 1000P 24 500 1.8 75C VCC1 1.4V RF 21.7MHz
-20C
VCC2 3.0V fDEV 4.5kHz fMOD 4kHz
Lo 21.25MHz 0dB -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20
RF input level (dBm) AFC output current characteristics 0.6
Fast mode
VCC1 1.4V VCC2 3.0V Pin 7 215mV fixed (external power supply)
50
0.4
Slow (Pin 7) current (A)
0.2
0
0
-0.2
Slow mode
-0.4 -50 -0.6 80 120 160 200 240 280 Pin 16 voltage (mV) 320 360 400
--19--
Fast (Pin 7) current (A)
CXA3176N
AFC amplifier characteristics 3 VCC2 3.0V VCC1 1.4V
2
Pin 6 voltage (V)
1
0
500 Pin 7 voltage (mV) LVA characteristics
1000
VCC2 3.0V
LVA comparator output voltage
High
Low
1050
1060
1070
1080
1090
1100
1110
Pin 4 voltage (mV)
--20--
CXA3176N
Package Outline
Unit : mm
24PIN SSOP(PLASTIC)
+ 0.2 1.25 - 0.1 7.8 0.1 0.1 13
24
A
1 b
12
0.13 M B 0.65
5.6 0.1
+ 0.05 0.15 - 0.02
0.5 0.2
DETAIL B : SOLDER 0 to 10
(0.15)
0.1 0.1
(0.22)
b=0.22 0.03
DETAIL B : PALLADIUM
NOTE: Dimension "" does not include mold protrusion. DETAIL A
PACKAGE STRUCTURE
PACKAGE MATERIAL EPOXY RESIN SOLDER/PALLADIUM PLATING 42/COPPER ALLOY 0.1g LEAD TREATMENT LEAD MATERIAL PACKAGE MASS
SONY CODE EIAJ CODE JEDEC CODE
SSOP-24P-L01 SSOP024-P-0056
NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).
--21--
+ 0.03 0.15 - 0.01
+ 0.1 b=0.22 - 0.05
7.6 0.2

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