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TELEFUNKEN Semiconductors
U 4270 B
FM IF limiter amplifier and detector
Description
The U 4270 B is an integrated bipolar FM-IF amplifier circuit with field strength indicator, stop signal generator, multipath detector and controllable mute function. It is designed for car radios and home receiver applications.
Features
D 7 stage limiter amplifier D Multipath signal detector D Stop signal generator with controllable threshold D Signal strength output D Controllable mute function D High signal/noise ratio and low signal distortion
Block Diagram
R3
1 14 (15) 9 (10) 10 (11)
Mute depth control
3 (4) 4 (5) 8 (9)
18(20) (19) 17
(8) 7
16 (18)
5 (6)
6
(7)
11 (12)
15 (16) 13 (14)
12 (13)
2
( ) SSO 20
94 8876
Rev. A1: 07.10.1994
Preliminary Information
1
U 4270 B
Pin description
DIP 18 1 2 - 3 4 5 6 7 8 9 10 SSO 20 1 2 3 4 5 6 7 8 9 10 11 Symbol GND MUTE IN NC MUTE DE AF STOP SEN Function Ground Mute input N.C. Mute depth AF output Search tuning stop sensitivity STOP SIG Search stop signal output AFC AFC output RVOLT Reference voltage output DEMOD Demodulator circuit DEMOD Demodulator circuit DIP 18 11 12 13 14 15 - 16 17 18 SSO 20 12 13 14 15 16 17 18 19 20
TELEFUNKEN Semiconductors
Symbol FS MPOUT RTC VS MPIN NC BFB BFB IF
Function Field strength Multipath identification output Rectifier time constant Supply voltage Multipath identification input N.C. Bias feedback Bias feedback IF input
GND MUTE IN MUTE DE AF STOP SEN STOP SIG AFC RVOLT DEMOD
1 2 3 4 5 6 7 8 9
94 8949
18 17 16 15 14 13
IF BFB BFB MPIN VS RTC
GND MUTE IN NC MUTE DE AF STOP SEN STOP SIG AFC RVOLT DEMOD
1 2 3 4 5 6 7 8 9 10
94 8948
20 IF 19 BFB 18 BFB 17 NC 16 MPIN 15 VS 14 RTC 13 MPOUT 12 FS 11 DEMOD
12 MPOUT 11 FS 10 DEMOD
2
Preliminary Information
Rev. A1: 07.10.1994
TELEFUNKEN Semiconductors
U 4270 B
Absolute Maximum Ratings
Reference point Pin 1, unless otherwise specified Parameters Supply voltage Junction temperature Storage temperature range Ambient temperature range Symbol VS Tj Tstg Tamb Value 18 150 - 40 to + 150 - 25 to + 85 Unit V C C C
Pin 14
Thermal Resistance
Parameters Junction ambient Symbol RthJA Maximum 100 Unit K/W
Electrical Characteristics
VS = 8.5 V, reference point Pin 1, fi = 10.7 MHz, adjusted at I7 = 0, Vi = 10 mV, FM-deviation Q0 = 20, Tamb = 25 _C, unless otherwise specified Parameters Supply voltage Supply current Field strength output Output voltage Test Conditions / Pin Pin 14 Pin 14 Pin 11 Vi = 200 mV Vi = 50 mV Vi = 1 mV Vi = 0 mV Pin 4 Symbol VS IS VOUT Min 7.5 19 4.4 4.2 2.5 0.01 290 0.48 77 62 6.7 34 0.9 Typ
" 75 kHz, f
Max 15 23 4.9 4.6 2.8 0.42 330 0.88 81 66 9 39 1.1
mod
= 1 kHz,
Unit V mA V
Audio output signal Output voltage Distortion (S+N)/N ratio AM-rejection Mute depth Maximum sink current Stop signal output Input frequency window Output voltage HIGH LOW Input voltage threshold
deviation 75 kHz m = 30 % V2 = 0 V, R3 = V2 = 0 V, R3 = 0
"
VAF THD S+N/N amute I4 Pin 6
R
7 36
mV % dB dB dB mA kHz V
R7-8 = 22 kW
fwin V6
" 23
7 0.1 25 0.6
" 28
0.2 45 1.3
I6 < 0.5 mA V6 = 0.5 V, Pin 5 open V6 = 0.5 V, V5 = V8
Vi
mV
mV
Rev. A1: 07.10.1994
Preliminary Information
3
U 4270 B
Parameters AFC output Output current Input frequency offset Reference voltage output Output voltage Maximum load current Multipath detection Detector threshold Output leakage current Charge current Discharge current Mute function Mute "off " voltage IF-Input signal Limiting threshold Test Conditions / Pin Pin 7 deviation 50 kHz IAFC = 0 Pin 8 I8 = 0.5 mA Symbol
TELEFUNKEN Semiconductors
Min 90 2 3.9 3 5.4 1.5 3 -7 3.6 - 10 Typ 110 Max 140 12 4.2 5 7 Unit
"
"I "f
AFC off
mA
kHz V mA mV
V8 I8 Pin 12, 13, 15 V12 < 1 V, fV15 = 20 kHz V15 V12 = VS I12 Pin 15 connected to ground I13 Pin 15 open circuit I13 V13 1 V Pin 2 Vout - 2 dB Voff Pin 18 Vout - 3 dB Vi
mA mA
V
mA
v
0.22 25
0.33 33
dBmV = 1 kHz,
VS = 8.5 V, reference point Pin 1, fi = 10.7 MHz, adjusted at I7 = 0, Vi = 10 mV, FM-deviation Q0 = 20, Tamb = - 40 to + 85 _C, unless otherwise specified Parameters Supply voltage Supply current Field strength output Output voltage Test Conditions / Pin Pin 14 Pin 14 Pin 11 Vi = 200 mV Vi = 50 mV Vi = 1 mV Vi = 0 mV Pin 4 Symbol VS IS VOUT Min 7.5 17 4.0 3.6 2.25 0.01 250 0.48 70 60 6 34 0.9 Typ
" 75 kHz, f
Max 15 25 5.0 4.7 2.95 0.42 370 0.88 81 70 10 40 1.1
mod
Unit V mA V
Audio output signal Output voltage Distortion (S+N)/N ratio AM-rejection Mute depth Maximum sink current Stop signal output Input frequency window Output voltage HIGH LOW Input voltage threshold
deviation 75 kHz m = 30 % V2 = 0 V, R3 = V2 = 0 V, R3 = 0
"
VAF THD S+N/N amute I4 Pin 6
R
7 36
mV % dB dB dB mA kHz V
R7-8 = 22 kW
fwin V6
" 23
7 14 0.6 0.1 20
" 39
0.5 54 2.0
I6 < 0.5 mA V6 = 0.5 V, Pin 5 open V6 = 0.5 V, V5 = V8
Vi
mV
mV
4
Preliminary Information
Rev. A1: 07.10.1994
TELEFUNKEN Semiconductors
Parameters AFC output Output current Input frequency offset Reference voltage output Output voltage Maximum load current Multipath detection Detector threshold Output leakage current Charge current Discharge current Mute function Mute "off voltage IF-Input signal Limiting threshold Test Conditions / Pin Pin 7 deviation 50 kHz IAFC = 0 Pin 8 I8 = 0.5 mA Symbol Min 60 Typ 110 8
U 4270 B
Max 140 15 4.2 5 7 1.5 2.1 -6 4.0 - 10 Unit
"
"I "f
AFC off
mA
kHz V mA mV
V8 I8 Pin 12, 13, 15 V12 < 1 V, fV15 = 20 kHz V15 V12 = VS I12 Pin 15 connected to ground I13 Pin 15 open circuit I13 V13 1 V Pin 2 Vout - 2 dB Voff Pin 8 Vout - 3 dB Vi
3.7 3 5.0
mA
mA
v
mA
0.22 25
0.33 33
V dBmV
Test circuit:
Vi Multipath input Q0
signal VAF
voltage
Rev. A1: 07.10.1994
Preliminary Information
5
U 4270 B
Ordering and package information
Extended type number U 4270 B-CFS U 4270 B-CFSG3 U 4270 B-C Package SSO 20 plastic SSO 20 plastic DIP 18
TELEFUNKEN Semiconductors
Remarks Taping according to IEC-286-3
Dimensions in mm
Package DIP 18
Package SSO 20
6
Preliminary Information
Rev. A1: 07.10.1994
TELEFUNKEN Semiconductors
U 4270 B
OZONE DEPLETING SUBSTANCES POLICY STATEMENT
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. meet all present and future national and international statutory requirements and 2. regularly and continuously improve the performance of our products, processes, distribution and operating systems. With respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. Of particular concern is the control or elimination of releases into the atmosphere of substances who are known as ozone depleting substances ( ODS's). The Montreal Protocol ( 1987) and its London Amendments ( 1990) will severely restrict the consumption of ODS's and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuos improvements to eliminate the use of any ODS's listed in the following documents that all refer to the same substances: (1) (2) (3) Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency ( EPA) in the USA and Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively.
TEMIC can certify, that our semiconductors are not manufactured with and do not contain ozone depleting substances.
We reserve the right to make changes without further notice to improve technical design. Parameters can vary in different applications. All operating parameters must be validated for each customer application by customer. Should Buyer use TEMIC products for any unintended or unauthorized application, Buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2831, Fax Number: 49 (0)7131 67 2423
Rev. A1: 07.10.1994
Preliminary Information
7

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