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PDF CXA1884N Data sheet ( Hoja de datos )
| Número de pieza | CXA1884N | |
| Descripción | Low-voltage FM IF Amplifier | |
| Fabricantes | Sony Corporation | |
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Low-voltage FM IF Amplifier
CXA1884N
Description
The CXA1884N is designed for FM communication
devices. They incorporate a paging system, mixer, IF
limiter, FM detector, operational amplifier, comparator,
and others.
20 pin SSOP (Plastic)
Features
• Low operating voltage
1.0 to 4.0V
• Low power consumption
2mA at 1.5V
• Built-in power source voltage monitor
Applications
IF Amplifier for Paging System Receiver
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings (Ta = 25°C)
• Supply voltage Vcc 7
• Operating temperature Topr –20 to +75
• Storage temperature Tstg –65 to +150
V
°C
°C
Recommended Operating Conditions
Supply voltage
Vcc 1.0 to 4.0
V
Block Diagram and Pin Configuration
20 19 18 17 16 15 14 13 12 11
MIXER
OSC
REG.
ERR.
AMP
A2
IF LIM.
QUAD
DET.
A1
1 2 3 4 5 6 7 8 9 10
Note)
DET. : DETECTOR
LIM. : LIMITER
REG. : REGURATOR
ERR. : ERROR CORRECTION
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–
E97Z05A8Y
1 page  
CXA1884N
Electrical Characteristics
(VCC = 1.5V, Ta = 25°C, fs = 21.7MHz, fMOD = 256Hz, fDIV = 2.3kHz, AMMOD = 30%)
Item Symbol
Power consumption (during operation) ICC
Power consumption
(during battery saving)
ICCS
Input for –3dB Limiting
VIN (LIM)
AM rejection ratio
AMRR
OP amplifier input bias current
IBIAS
OP amplifier open loop gain
AV
OP amplifier output voltage amplitude VO
Comparator hysteresis width
NRZ∗ output leak current
VTW
ILNRZ
NRZ∗ saturation voltage
VSATNRZ
VB output current
VB output voltage
Sense voltage
LVA threshold voltage
LVA hysteresis width
LVA output leak current
LVA saturation voltage
Recovered signal voltage
BSV high level
BSV low level
∗ NRZ: Non Return Zero
IOUT
VBOUT
VSEN
VPML
VPMTH
ILLVA
VSATLVA
VDET
VTHBSV
VTLBSV
Condition
Test circuit 1
Test circuit 1
VI = 0.3V
Test circuit 3
VIN = 60dBµ
Test circuit 3
Test circuit 2
Test ciTcuit 4
Test circuit 5
Test circuit 6
Test circuit 7
ISINK = 200µA
Test circuit 8
VB = 0.9V
Test circuit 9
Test circuit 2
Test circuit 10
VPMH – VPML
Test circuit 7
Test circuit 8
Test circuit 3
Min. Typ. Max. Unit
1.2 2.0 2.6 mA
— — 20 µA
— 7 — dBµ
25 — — dB
— 30 100 nA
45 60 — dB
0.25 —
— Vp-p
30 40 50 mV
— — 5.0 µA
— — 0.4 V
0.1 — — mA
0.95 —
—
V
85 100 115 mV
1.00 1.05 1.10
V
35 50 70 mV
— — 5.0 µA
— — 0.4 V
10 — — mVrms
0.95 —
—
V
—
— 0.35
V
–5–
5 Page 
CXA1884N
5) IF limiter
The IF limiter of this IC features a gain of about 100dB. To this effect, the following points should be
considered for the wiring connecting IF limiter input pin (Pin 5) and decoupling capacitor pins (Pins 6 and 7).
(a) Wiring to mixer output (Pin 3) and IF limiter input (Pin 5) should be as short and as far apart as possible
to avoid neutral interference.
(b) Connect a decoupling capacitor to IF limiter IF P1 (Pin 6) and IF P2 (Pin 7).
Here the decoupling capacitor should be positioned as close as possible to each pin and the wiring be as
short as can be.
(c) As IF limiter output shows at QD (Pin 8), keep the wiring connected to QD pin R, L, C and the ceramic
discriminator as short as possible. Interference to the mixer output, IF limiter input and others must be
kept to a minimum.
34 5678
VCC
Wiring as short and as far apart as possible As short as possible
Fig. 2
6) Detector
The detector is of the quadrature type. To phase shift, either R, L, C resonance circuit or the ceramic
discriminator is connected to Pin 8.
The phase capacitor of the quadrature detector is built-in. FM (FSK) signals demodulated by this detector have
their high frequency components dropped by the LPF formed inside from CRs, to be output at DET OUT (Pin 9).
DET OUT output impedance is about 3kΩ.
For the CXA1884N ceramic discriminator, CDB 455 C3 (Murata Production) is recommended.
78
9
78
9
Coil
VCC
(a) Coil
DET OUTPUT
Fig. 3
4.7k DET OUTPUT
Ceramic
discriminator
VCC CDB 455 C3
(b) Ceramic discriminator
– 11 –
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| PDF Descargar | [ Datasheet CXA1884N.PDF ] | |
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