NJM2590V-TE1 NJR, NJM2590V-TE1 Datasheet - Page 11

• Manufacturer Part Number: NJM2590V-TE1
• Description: IC FM-IF DEMOD 455KHZ 14-SSOP
• Manufacturer: NJR

Specifications of NJM2590V-TE1

• Function: Demodulator
• Rf Frequency: 455kHz
• Voltage - Supply: 1.6 V ~ 5.5 V
• Package / Case: 14-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Supply: -
• Gain: -
• Noise Figure: -
• P1db: -
• Lo Frequency: -
• Other names: NJM2590V-TE1; NJM2590V-TE1TR

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Ver.2004-08-25
Carrier sense
The result of comparator is output to pin13 by comparing the output voltage of pin11 with external reference voltage
of pin 12. Because pin13 is an open-collector terminal, an external resistor can be connected to another power
supply within the limit of absolute maximum ratings.
RSSI circuit (RSSI)
A DC voltage corresponding to the input level of pin1 is output to pin11. The internal resistance of pin11 is around 48
kΩ. The RSSI characteristics can be changed by adding an external resistor,. In such a case, note that the
temperature characteristics of pin 11 may alter due to a disparity between the temperature coefficient of the external
resistor and the internal resistor of pin 11.
Low pass filter (LPF)
This is a 3rd-order multiple feedback filter.
The cut-off frequency Fc is obtained by ;
Each of pin7(LPF IN) and pin8(LPF OUT) has a built-in ESD protective resistor 300 Ω .
Fc
6
68kΩ
2π
Ra
3
RaRbRcCaCb
11
3300 pF
1000pF
68kΩ
Ca
1
Rb
500Ω
48kΩ
300Ω
V+
0.01 uF
Cc
68kΩ
Cc
Rc
[
12
Hz
11
]
SENSE
LEVEL
7
+
560pF
-
Cb
300Ω
1000 pF
where Ra=Rb=Rc or Ca=Cb=Cc
+
-
Rext
13
100kΩ
300Ω
V+
8
NJM2590/97
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