NJM2592 JRC, NJM2592 Datasheet - Page 4

• Manufacturer Part Number: NJM2592
• Description: FM IF Demodulator IC / SSOP20
• Manufacturer: JRC

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NJM2592
- 4 -
TEST CIRCUIT
This test circuit allows the measurement of all parameters described in “ELECTRICAL CHARACTERISTICS”. This
test circuit includes some electrical switches that should be in the suitable position for the measurement of each
parameter.
CERAMIC DISCRIMINATOR (especially designed for NJM2592)
To optimize some important performance, the following ceramic discriminator CD is available. For more information
on this CD and 450kHz CD, please contact the CD supplier.
Circuit diagram
“Condition1” is the condition for the case of IF input :
Measurement condition
“Condition 2” is the condition for the case of Mixer Input :
C D
IF FILTER : Ceramic filter, CFWB455KEFA004 (Murata Manufacturing Co., Ltd., Japan)
CDBCB455KCAY71 (Murata Manufacturing Co., Ltd., Japan)
with the external capacitance of 33pF located between pin 9 and pin10.
IF SW
IF IN input signal : input frequency(fif) = 455kHz, input level(VinIF)= 60dBuVEMF,
IF SW
MIX IN input signal: input frequency(fmix)=430MHz, input level(VinMIX)=60dBuVEMF,
OSC(E)input signal: input frequency(fosc)=429.545MHz, input level(VinOSC)=105dBuVEMF
: Ceramic discriminator, CDBCB455KCAY66 (Murata Manufacturing Co., Ltd, Japan)
1000p
430MHz
20
1
51
OSC
429.545MHz
BUFFER
MIXER
19
2
: in the A position.
: in the B position
1000p
IF FILTER
modulation frequency(fmod)=600Hz, deviation fdev=±4kHz
modulation frequency(fmod)=600Hz, deviation fdev=±4kHz
10u
18
3
1000p
RSSI
OUT
V
17
+
4
RSSI COMP
+
10u
-
1000p
CARRIER
SENSE
IF SW
B
V
16
+
5
A
RSSI
0.1u
100k
V
+
FSK COMP
OUT
FSK
15
6
IF AMP
0.1u
+
51
-
100k
V
+
-
CHARGE
+
SWITCH
Hi
14
7
Lo
+
10u
455kHz
CHARGE
FILTER AMP
13
8
0.01u
+
-
12
9
22p
68k
68k
560p
(2)
3.3k
11
10
QUAD
68k
10u
DET
CD
3300p
V
+
Ver.2004-08-25