NJRC NJM2592V

NJM2592
Under Development
470MHz INPUT 455kHz FM IF DEMODULATOR
GENERAL DESCRIPTION
PACKAGE OUTLINE
The NJM2592 is a low-voltage, low-current FM IFdemodulator IC
with 455kHz(standard) IF frequency. It includes an oscillator, mixer,
limiting amplifier, quadrature detector,active filter, and FSK comparator.
The NJM2592 also has a RSSI circuit and RSSI comparator for
carrier sense.
NJM2592V
FEATURES
Low Operating Voltage
1.8V to 5.5V
Low Operating Current
3.5mA at V+ =2.0V
Operating Frequency
up to 470MHz (reference value)
IF Input Frequency
455kHz (standard)
Ceramic Discriminator or LC resonant Circuit
FSK Comparator with Open-collector Output
Quick Charge /Discharge Circuit for FSK Reference Voltage
Bipolar Technology
Package Outline
SSOP20
BLOCK DIAGRAM
MIX
IN
SENSE RSSI CARRIER FSK CHARGE LPF
SW
OUT
GND LEVEL OUT SENSE OUT
20
19
18
17
16
15
14
13
LPF
IN
AF
OUT
12
11
MIXER
RSSI COMP FSK COMP
BUFFER
RSSI
OSC
Ver.2003-05-15
FILTER AMP
CHARGE
QUAD
DET
IFAMP
IF
AMP
1
2
3
4
5
6
7
8
9
10
OSC
(B)
OSC
(E)
MIX
OUT
V+
IF
IN
DEC
FSK
REF
NC
IF
OUT
QUAD
IN
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NJM2592
ABSOLUTE MAXIMUM RATINGS
PARAMETER
(Ta=25°C)
SYMBOL
RATINGS
UNIT
Supply Voltage
V+
7.0
V
Power Dissipation
PD
300
mW
Operating Temperature
Topr
- 40 to +85
°C
Storage Temperature
Tstg
- 40 to +125
°C
RECOMMENDED OPERATIONAL CONDITION
PARAMETER
Supply Voltage
SYMBOL
TEST CONDITIONS
V+
(Ta=25°C)
MIN.
TYP.
MAX.
UNIT
1.8
2.0
5.5
V
ELECTRICAL CHARACTERISTICS
(Ta=25°C, V+=2V, fmix=470MHz, fif=455KHz, fmod=600Hz, fdev=±4KHz, unless otherwise noted)
PARAMETER
Current Consumption
SYMBOL
Iccq
Mixer Conversion Gain1
Gmix1
Mixer Conversion Gain2
Gmix2
Mixer 3rd Order Intercept
IP
TEST CONDITIONS
No Signal
Pin3 is terminated with
2kΩ.
Pin3 is terminated with
2kΩ.
MIN.
TYP.
MAX.
UNIT
-
3.5
-
mA
-
20
-
dB
-
TBD
-
dB
-
95
-
dBuV
Mixer Input Resistance
RinM
fmix=470MHz
-
50
-
Ω
Mixer Input Capacitance
CinM
fmix=470MHz
-
TBD
-
pF
Mixer Output Resistance
R oM
-
2
-
kΩ
Signal to Noise Ratio 1
S/N1
-
60
-
dB
Signal to Noise Ratio 2
S/N2
-
60
-
dB
Signal to Noise Ratio 3
S/N3
-
30
-
dB
-3dB limiting Sensitivity
VIn(lim)
IF input
-
22
-
dBuVEMF
IF input, AM=30%
Vi=60dBuVEMF
-
50
-
dB
-
2
-
0.9
-
V
-
60
-
mVrms
AM Rejection Raito
AMR
IF Amplifier Input Resistance
RinIF
RSSI Output Voltage
Vrssi
Demodulated Output Level
Vod
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Mixer input
Vin=60dBuVEMF
Mixer input
Vin=60dBuVEMF
Mixer input
Vin=25dBuVEMF
IF input
Vi=40dBuVEMF
IF input
Vi=60dBuVEMF
kΩ
Ver.2003-05-15
NJM2592
Oscillator Circuit
Crystal and LC resonant Element
CARRIER FSK
RSSI SENCE OUT
V+
BPF
V
CHARGE
Switch
+
LNA
RF
20 IN 19
18
17
16
15
14
13
12
11
MIXER
RSSI COMP FSK COMP
BUFFER
RSSI
OSC
1
FILTER AMP
CHARGE
QUAD
DET
IFAMP
IF AMP
2
3
4
5
V
+
OverTone
X'tal
6
7
CDEC
8
9
10
+
CREF
DET
TANK
V+
IF
Filter
PLL Frequency Synthesizer IC
MIXER
BUFFER
OSC
1
2
3
4
5
V
PLL Synthesizer
Ver.2003-05-15
+
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
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