View TDA7361_441110.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

TDA7361
LOW VOLTAGE NBFM IF SYSTEM
. . . . .
OPERATION FROM 1.8V TO 9V LOW DRAIN CURRENT (4mA, Vs = 4V) HIGH SENSITIVITY (-3dB input limiting at 3V) 8V INPUT FOR 20dB S/N LOW EXTERNAL FAIR COUNT
DIP16 ORDERING NUMBER : TDA7361
DESCRIPTION The TDA7361 is a low-power narrow band FM IF demodulation system operable to less than 2 V supply voltage. The device includes Oscillator, Mixer, Limiting Amplifier, Quadrature Discriminator, Op. Amp. Squelch, Scan Control and Mute Switch. The TDA7361 is designed for use in NBFM dual conversion communication equipments using a 455 KHz ceramic filter like cordless telephones, walkie-talkies, scan receivers, etc. PIN CONNECTION
SO16 ORDERING NUMBER : TDA7361D
June1993
1/8
TDA7361
Pin FUNCTION
No 1-2 Name XTAL OSCILLATOR Function Connections for the Colpitts XTAL Oscillator. The XTAL may be replaced by an inductor (see Figure 5) if the application does not require high stability. The Mixer is double balanced to reduce spurious products. The output impedance is 1.8kW to match the input impedance of a 455kHz ceramic filter. Must be well decoupled with a 100nF ceramic capacitor. Input pin of the six stages amplifier with about 50V limiting sensitivity and 1.8k input impedance. The if output is connected to the external quadrature coil (Pin 8) via an internal 10pF capacitor. Good quality 100nF ceramic capacitors and a suitable layou are important. A quadrature detector is uded to demodulate the 455kHz FM signal. The Q of the quad coil has direct effect on output level and distorsion (see Figure 6). For proper operation the voltage should be 100mVRMS. The audio output signal is buffered by an internal emitter follower. Because of the low DC bias, the swing on the operational amplifier output is limited to 500mVRMS. This can be increased by adding a resistor from the operational amplifier input to ground. The squelch trigger circuit with a low bias on the input (Pin 12) will force Pin 13 high ; and Pin 14 low. Pulling Pin 12 above mute threshold (0.65V) will force Pin 13 to an impedance of about 60k to ground and Pin 14 will be an open circuit. An hysteresis of about 50mV at Pin 12 will effectively prevent jitter. Ground Connection Input of the Wide-band Mixer. Normally used as 10MHz/455kHz converter, it can be also used with input frequencies up to 60MHz.
3 4 5
MIXER OUT SUPPLY VOLTAGE IF LIMITER INPUT
6-7 8
DECOUPLING QUADRATURE COIL
9 10 11 12 13 14 15 16
AUDIO OUTPUT SIGNAL OPERATIONAL AMPLIFIER INPUT OPERATIONAL AMPLIFIER OUTPUT SQUELCH INPUT SCAN CONTROL MUTE GND 10.7MHz MIXER INPUT
BLOCK DIAGRAM
2/8
TDA7361
ABSOLUTE MAXIMUM RATINGS
Symbol VS VI V8 V14 Toper Tstg Supply Voltage RF Input Voltage (Pin 16) Detector Input Voltage Mute Function Voltage Operating Ambient Temperature Storage Temperature Parameter Value 9 1 1 - 0.5 to +5 0 to 70 - 65, + 150 Unit V VRMS VPP V
o o
C C
THERMAL DATA
Symbol Rth j-amb Parameter Junction-ambient Thermal Resistance Max. SO16 200 DIP16 100 Unit
o
C/W
ELECTRICAL CHARACTERISTICS T amb = 25oC, unless otherwise specified
Symbol VS IS VI VI VO V9 R9 GV V11 IB VT Rm V13 GC RI CI Supply Current Input Quieting Voltage Input Limiting Voltage Recovered Audio Output Detector Output Voltage Detector Output Impedance Dtectot Center Frequency Slope Operational Amplifier Gain Operational Amplifier Output Voltage Operational Amplifier Input Bias Current Trigger Hysteresis Mute Switching Impedance Scan Voltage Mixer Converter Gain Input Resistance Input Capacitance Low High Pin 12 High (2V) Pin 12 Low (0V) 3.0 Pin 10 f = 10kHz, GV = V11 /V10 40 Parameter Supply Voltage Range Squelch OFF Squelch ON S/N = 20dB - 3dB limiting VI = 10mV Test Conditions Min. 1.8 Typ. 4 3.8 4.7 8 3 150 1.5 400 150 55 1.5 20 50 50 10 0 3.4 30 3.3 2.2 0.5 Max. 9 Unit V mA mA V V mVRMS VDC mV/kHz dB VDC nA mV M VDC VDC dB k pF
3/8
TDA7361
Figure 2 : Test Circuit
Figure 3 : Supply Current versus Supply Voltage
Figure 4 : FM IF Characteristics
4/8
TDA7361
Figure 5 : Colpitts XTAL Oscillator Figure 6 : Effect of Quadrature Coil "Q" on Audio Level and Distortion
Figure 7 : Application Information (49MHz cordless receiver)
5/8
TDA7361
SO16 PACKAGE MECHANICAL DATA
DIM. MIN. A a1 a2 b b1 C c1 D E e e3 F L M S 3.8 0.4 9.8 5.8 1.27 8.89 4.0 1.27 0.62 8 (max.) 0.150 0.016 10 6.2 0.35 0.19 0.5 45 (typ.) 0.386 0.228 0.050 0.350 0.157 0.050 0.024 0.394 0.244 0.1 mm TYP. MAX. 1.75 0.25 1.6 0.46 0.25 0.014 0.007 0.020 0.004 MIN. inch TYP. MAX. 0.069 0.009 0.063 0.018 0.010
6/8
TDA7361
DIP16 PACKAGE MECHANICAL DATA
DIM. MIN. a1 B b b1 D E e e3 F I L Z 3.3 1.27 8.5 2.54 17.78 7.1 5.1 0.130 0.050 0.51 0.77 0.5 0.25 20 0.335 0.100 0.700 0.280 0.201 1.65 mm TYP. MAX. MIN. 0.020 0.030 0.020 0.010 0.787 0.065 inch TYP. MAX.
7/8
TDA7361
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A.
8/8

▲Up To Search▲

Price & Availability of TDA7361

	To Download TDA7361 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .