u4255bm ATMEL Corporation, u4255bm Datasheet

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u4255bm

Manufacturer Part Number
u4255bm
Description
Am/fm Receiver
Manufacturer
ATMEL Corporation
Datasheet

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AM/FM Receiver IC
Description
The U4255BM is an integrated AM/FM front end circuit
in BICMOS technology. It contains a double conversion
system for FM and an up/down conversion circuit
for AM (IF1 = 10.7 MHz, IF2 = 450 kHz). A complete
automatically aligned high performance AM/FM tuner
Features
D FM-double conversion system
D Integrated second IF filter with software controlled
D Completely integrated FM demodulator
D Soft mute and multipath noise cancellation
D Receiving condition analyzer
Block Diagram
Ordering Information
Rev. A1, 26-Jun-00
MX1AMA
MX1AMB
AMVREG
MX1FMB
MX1FMA
GNDOSC
OSCOUT
AMAGC
GNDMX
bandwidth
OSCB
OSCE
Extended Type Number
U4255BM-AFNG3
41
3
4
2
1
16
15
14
13
U4255BM-AFN
7
6
AMPLPF
OSC
FM
AGC
8
MX1OA
EN
Divider
17 18 19
CLK
AM
Bus
43
MX1OB
DATA
44
IF1FMI
FMAGC
AGC
38
5
IF1REF
V57
39
FM
V3
Bandgap
12 25 42 9
IF1AMI
AM
GND
33
VS
IF1OUT
METER
V3
30 29
V3
Figure 1. Block diagram
MX2IN
Package
SSO44
SSO44
26
MX2OB
MX2LO
23
22
MX2OA
24
Adj.
chan.
can be built together with the PLL U4256BM. This ICs
are designed for high performance car radio applications.
Electrostatic sensitive device.
Observe precautions for handling.
D AM up/down conversion system
D AM preamplifier with AGC and stereo capability
D 3-wire bus controlled
D Stop signal generation for AM and FM
D Automatic alignment possible
ADJAC
IF2IN
10
28
Stop
V3P
27
INT
INT
Tube
Taped and reeled
21
Multi–
path
MULTIP
40
AGC
IF2OUT
FM
dem.
20
Remarks
AM
dem.
Soft
mute
U4255BM
SMUTE
Automatic
adjustment
34
Dev.
ana.
DEV
31
32
35
36
37
11
OPLPF
IFAGCL
IFAGCCH
FMADJ
MPX
1 (12)

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u4255bm Summary of contents

Page 1

... AM/FM Receiver IC Description The U4255BM is an integrated AM/FM front end circuit in BICMOS technology. It contains a double conversion system for FM and an up/down conversion circuit for AM (IF1 = 10.7 MHz, IF2 = 450 kHz). A complete automatically aligned high performance AM/FM tuner Features D FM-double conversion system D Integrated second IF filter with software controlled ...

Page 2

... U4255BM Pin Description MX1FMA 1 MX1FMB 2 MX1AMB 3 GNDMX 4 FMAGC 5 AMVREG 6 AMAGC 7 AMPLPF 8 METER 9 ADJAC 10 MPX 11 V57 12 OSCB 13 OSCE 14 GNDOSC 15 OSCOUT CLK 18 DATA 19 20 IF2OUT INT 21 MX2LO 22 14856 Figure 2. Pinning 2 (12) Pin Symbol 1 MX1FMA 1st mixer FM input A 2 MX1FMB 1st mixer FM input B ...

Page 3

... V Pin Pins 43 and 44 vo IP3 Pin 41 Pin 330 W Pins Pins 23 and IP3 R U4255BM Value Unit 10 800 mW 150 –40 to +85 –50 to +150 Value Unit 80 K/W Min. Typ. Max. 7.5 8.5 10 –40 +85 = 450 kHz, reference point Pin 4 IF Min ...

Page 4

... U4255BM Electrical Characteristics (continued) Test conditions (unless otherwise specified 100 MHz For AC parameters Parameters 2nd IF Amplifier (450 kHz) Input resistance IF preamplifier gain Preamplifier control range Oscillator (Pin 15, GND, connected to external oscillator components) Rg (Pin 13) = 220 W, Oscillator range Q of Losc = 70, ...

Page 5

... B87 B86 B85 B84 B83 B82 B81 BYTE 2 LSB Tk-fmzf FM AGC AM-AGC FM BW IF2 B66 B65 B64 B63 B62 B61 B60 U4255BM LSB BYTE 3 MSB IPD3 IPD1 OSCB 0 0 P–2 P–2 P–2 IPD4 IPD2 Status 0 Addr. MSB BYTE 1 Field BWmpx ...

Page 6

... U4255BM Bus Timing t R Enable Data Clock Bus Control The operating mode is set by the Bits 92 and 93 AM/FM/Weather Channel Bit 93 Standby Weather band 1 The Bits control gain of the FM IF amplifier Gain FM-IF Bit ...

Page 7

... Bit 80 Bit 67 sets the maximum reduction of the MPX signal level Max Value of Soft Mute 0 1 Temperature coefficient setting amplifier Temperature Coefficient Bit 79 (TC) of the IF amplifier 0 1 U4255BM Bit 78 Bit 77 Bit 76 Bit 75 Bit 74 Bit ...

Page 8

... U4255BM Level Control of the FM AGC threshold FM AGC Threshold Bit 65 103 dBmV 0 97 dBmV 1 92 dBmV 0 85 dBmV 1 Level Control of the AM AGC threshold AM AGC Threshold Bit 63 102 dBmV 0 105 dBmV 1 107 dBmV 0 108 dBmV 1 Bits 60 and 61 control the bandwidth of the 2nd mixer ...

Page 9

... VS V Bus V Rev. A1, 26-Jun-00 Test point 14906 Figure 5. Test circuit U4255BM 50 50 Pin Pin (12) ...

Page 10

... U4255BM Application Board Schematic 10 (12) Figure 6. Application board schematic Rev. A1, 26-Jun-00 ...

Page 11

... Package Information Package SSO44 Dimensions in mm 18.05 17.80 0.3 0.8 16 Rev. A1, 26-Jun-00 U4255BM 9.15 8.65 7.50 7.30 2.35 0.25 0.10 10.50 10.20 23 technical drawings according to DIN specifications 22 0.25 13040 11 (12) ...

Page 12

... U4255BM Ozone Depleting Substances Policy Statement It is the policy of TEMIC Semiconductor GmbH to 1. Meet all present and future national and international statutory requirements. 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 ...

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