AM/FM Receiver T4258N Electrostatic sensitive device. Observe pre

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AM/FM Receiver T4258N Electrostatic sensitive device. Observe pre

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Double-conversion System Integrated Second Filter with Software-controlled Bandwidth Completely Integrated Demodulator Soft Mute Multipath Noise Cancellation Receiving Condition Analyzer Up/Down-conversion System Preamplifier with Stereo Capability 3-wire Controlled Search Stop Signal Generation Automatic Alignment Possible Compatible with U4255BM World Tuner, Weatherboard, J-band
AM/FM Receiver T4258N
Electrostatic sensitive device. Observe precautions handling.
Description
T4258N highly integrated AM/FM front-end circuit manufactured using Atmel's advanced BICMOS technology. represents complete, automatically adjustable AM/FM front end, containing double-conversion system up/down-conversion receiver with 10.7 kHz. front suitable digital analog AF-signal processing. Together with U4256BM, automatically aligned high-performance AM/FM tuner built. These dedicated highly sophisticated radio applications.
Rev. 4566B-AUDR-02/04
Figure Block Diagram
IF1FMI MX1OA MX1OB IF1REF Dem. MX1AMA MX1AMB AMAGC AMVREG AMPLPF Noiseblanker MX1FMA MX1FMB GNDMX OSCOUT Divider GNDOSC OSCE OSCB Divider 2.10 Offset Adj. Chan. Stop Dem. Soft Mute Automatic FILADJ Adjustment IFAGCL IFAGCH IF2OUT OPLPF IF1AMI MX2OB IF1OUT MX2IN MX2OA IF2IN
MultiMULTIP path
Bandgap METER MX2LO ADJAC SMUTE Dev. Ana.
DATA FMAGC
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T4258N
Configuration
Figure Pinning SSO44
MX1FMA MX1FMB MX1AMB GNDMX FMAGC AMVREG AMAGC AMPLPF METER
MX1OB MX1OA MX1AMA MULTIP IF1REF IF1FMI FILADJ IFAGCL IFAGCH SMUTE IF1AMI OPLPF IF1OUT IF2IN MX2IN MX2OA MX2OB
ADJAC OSCB OSCE GNDOSC OSCOUT DATA IF2OUT MX2LO
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Description
Symbol MX1FMA MX1FMB MX1AMB GNDMX FMAGC AMVREG AMAGC AMPLPF METER ADJAC OSCB OSCE GNDOSC OSCOUT DATA IF2OUT MX2LO MX2OB MX2OA MX2IN IF2IN IF1OUT OPLPF IF1AMI SMUTE IFAGCH IFAGCL FILADJ IF1FMI IF1REF MULTIP Function mixer input mixer input mixer input Ground mixer, preamplifier preamplifier control voltage preamplifier filter Field strength output Adjacent channel detection output Multiplex signal reference voltage Oscillator basis Oscillator emitter Oscillator ground Oscillator output 3-wire enable 3-wire clock 3-wire data amplifier output Interrupt, stop signal 10.25 input mixer mixer output mixer output Ground mixer input reference AMPIN, AMIFAGC, Control, IF2IN amplifier input reference IF1OUT, MX2IN amplifier output Deviation detect output, test output Operating point amplifier input Soft MUTE control input filter high time filter time constant Filter adjust amplifier input MX1OUT reference, MX1AM MX1AM Multipath detection output
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Description (Continued)
Symbol MX1AMA MX1OA MX1OB Function mixer input Supply voltage mixer output mixer output
Functional Description
T4258N implements up/down-conversion reception path from input signal AM-demodulated audio frequency output signal, FM/WB reception double-conversion reception path from input signal FM-demodulated multiplex signal (MPX). prescaler integrated generate frequency mixer. Automatic gain control (AGC) circuits implemented control preamplifier stages reception path. improved performance, integrated filter with adjustable bandwidth, softmute feature automatic multipath noise cancellation (MNC) circuit fully integrated. powerful sensors provided receiving condition analysis stop signal generation. Several register bits (bit used control circuit operation adapt certain circuit parameters specific application. control bits organized 8-bit three 24-bit registers that programmed 3-wire protocol. protocol bit-to-register mapping described section "3-wire Description" page meaning control bits mentioned following sections. integrated high frequency range. Additionally special divider which allows connection with VCO) reception analog world bands.
Reception Mode
operated four different modes. Mode Standby selected means according Table page Additionally operating modes, signal paths separately. selects first mixer AGC, selects amplifier stage. recommended settings included Table page mode mixer, RF-AGC amplifier activated. input amplifier connected output amplifier demodulator. output demodulator available output mode mixer, RF-AGC amplifier activated. bandwidth output tank increased input amplifier switched between output amplifier integrated band filter demodulator. output demodulator available output mode similar mode, reduce bandwidth amplifier with filter (bit used. mode range integrated filter bandwidth control shifted lower bandwidth gain demodulator increased. standby mode mixers, amplifiers circuits deactivated reduce current consumption.
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Table Operating Mode
AM/FM/Weather Channel Standby Weather band
Test Mode
special test mode implemented final production test only. This mode activated setting This mode intended used customer applications. normal operation, deactivated normal operation mode. Table Test Mode
Mode Normal operation Test mode
VCO/Local Oscillator Prescaler
oscillator circuit implemented build proposed application schematic. frequency used generate frequency mixer stages. control voltage usually generated circuit U4256BM. frequency range allow reception analog world bands. main element implemented oscillator circuit bipolar transistor. internally biased base connected emitter circuit (bit activated increase emitter current until appropriate oscillation level reached. fundamental emitter current changed Table Local Oscillator
Local Oscillator (VCO) (default)
Table Local Oscillator Gain
Local Oscillator (VCO) Gain High Gain
addition prescaler) special prescaler implemented modes (AM, FM). divider factor prescaler buffer provides signal buffered output prescaler provides signal mixer stage prescaler. Examples prescaler settings described section "Application Information" page divider factor buffer prescaler selected according Table page
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Table Local Oscillator Prescaler (VCO/Buffer Divider)
Prescaler Note: Prescaler Buffer
U4256 FMOSCIN (pin input frequency limited MHz.
RF-AGC
RF-AGC circuit includes wide-band level detector input mixer in-band level detector output amplifier (pin 30). outputs these level detectors used control current into diode (see Figure order limit signal level mixer input following stages. maximum diode current determined R115 time constant control loop adjusted changing value C111. threshold level input mixer adjusted according Table in-band threshold refers mixer input (pin depends gain amplifier adjusted Table FM-AGC Threshold
FM-AGC Threshold dBµV dBµV dBµV dBµV
Figure RF-AGC
C111 R115
Diode
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RF-AGC
RF-AGC controls current into diodes (pin source drain voltage MOSFET preamplifier stage (pin limit level mixer input (pin 41). This threshold level level mixer input exceeds selected threshold, current into diodes increased. this step sufficient, source drain voltage MOSFET decreased. time constant control loop adjusted changing value capacitor Table AM-AGC Threshold
AM-AGC Threshold dBµV dBµV dBµV dBµV
Mixer Mixer
mixer stage, reception frequency down converted frequency. frequency used frequency mixer. mixer used up-conversion reception frequency frequency. Therefore, prescaler implemented generate necessary frequency from frequency. divide factor prescaler selected according Table (The prescaler only active mode). Table Divide Factor Prescaler
Divider Prescaler) Divide Divide Divide Divide Divide Divide Divide Divide Divide
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Amplifier
programmable gain amplifier used (and mode between compensate loss external ceramic band filters. gain this amplifier adjusted input output resistance fits external ceramic filters. different temperature coefficients amplifier selected Table Gain Amplifier
Gain
Table Temperature Coefficient Setting Amplifier
Temperature Coefficient (TC) Amplifier TKmin TKmax
Amplifier Mixer
mode, gain amplifier controlled IF-AGC extend control range IF-AGC.
mixer used mode. mixer input input resistance connected directly external ceramic filter. mode, high output resistance second mixer reduced increase bandwidth tank mixer output. output resistance selected mode should Table Mixer Output Resistance Mode
Output Resistance (Bit 0.63 0.47 0.29 Output Resistance (Bit 0.78 0.55 0.32
frequency mixer (10.25 MHz) applied This signal usually generated circuit U4256BM.
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Table Bandwidth Mixer
Note: Bandwidth Mixer
bandwidth also dependant values application circuit.
Amplifier
mode, input second amplifier externally connected mixer tank through ceramic filter achieve channel selectivity. During normal operation (bit input second amplifier connected mixer output (pin integrated band filter used channel selectivity only. possible additional external filter between mixer tank mode setting Table Filter Mode
Filter Internal filter External internal filter
IF-AGC
IF-AGC controls level signal that passed demodulator input integrated band filter output, different time constants IF-AGC selected capacitors (IFAGCH) (IFAGCL). short time constant (IFAGCL) used FM/WB mode search mode. long time constant (IFAGCH) used reception. Table IF-AGC Time Constant
Mode FM/WB reception search Time Constant IFAGCL (fast) IFAGCH (slow) IFAGCL (fast)
FM/WB mode, output signal demodulator applied series resistor about This low-pass filtered output signal demodulator used demodulator fine adjustment, muting reference deviation sensor.
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Output
after gain-controlled amplifier available (bit mode, this signal used external stereo decoder. Alternatively, signal corresponding logarithmic field strength after integrated band filter, which used multipath detection, switched setting Table Output Setting
output
Multipath field strength
Automatic Center Frequency Adjustment
Integrated active filters used band filter, demodulator adjacent channel sensor. center frequency these filters automatically adjusted second frequency kHz. frequency 10.25 used reference this alignment. Figure Automatic Center Frequency Adjustment
10.25
Automatic frequency adjustment
Center frequency Center frequency 14.17
FM-Demod
56.59
FMband filter
fine tuning, center frequency these integrated active filters (band filter demodulator) shifted steps 6.25 means Additionally, center frequency band filter adjusted separately means
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Table Center Frequency
Center 450.00 456.25 462.50 468.75 475.00 481.25 487.50 493.75 450.00 443.75 437.50 431.25 425.00 418.75 412.50 406.25
Table Band Filter Center Frequency Correction
Correction -6.25 -12.50 -18.75 -25.00 -31.25 -37.50 -43.75 (default) +6.25 +12.50 +18.75 +25.00 +31.25 +37.50 +43.75
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Integrated Band Filter reception band filter with variable bandwidth integrated front
demodulator provide channel selectivity bandwidth this filter adjusted (see Table suitable present receiving condition. mode, bandwidth integrated filter shifted lower bandwidth values, while necessary channel selectivity achieved external ceramic filter. center frequency integrated band filter adjusted means field strength after integrated band filter that available (bit used this purpose. Table Bandwidth Integrated Band Filter
Bandwidth Bandwidth
Demodulator
weather band reception, gain demodulator increased adjusted means order increase output voltage compensate frequency deviation weather band. integrated demodulator fine adjustment allows automatic fine tuning demodulator center frequency average frequency received signal. This feature implemented weather band mode activated setting Figure Demodulator Automatic Fine Tuning
Demod
(Pin IFAGCH (Pin (Pin
Center freq.
Automatic frequency adjustment
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center frequency demodulator adjusted means center frequency, voltage output equal offset voltage that measured while mute active (bit This adjustment will affect center frequency integrated filters mentioned before. Table Demodulator Gain Weather Band Mode
Demodulator Gain Weather Band Mode Relative Mode
Table Demodulator Fine Adjustment
Demodulator Fine Adjustment Fine tuning Fine tuning
Soft Mute
soft mute functionality implemented reduce output level demodulator input signal levels limit noise output this case. input level falls below adjustable threshold continuously, output demodulator continuously muted with decreasing input level until maximum mute value reached. threshold start soft mute maximum mute adjusted. signal level mute means maximum value soft mute selected steepness time constant soft mute adjusted resistor capacitor between field strength signal available used soft mute. Therefore, soft mute threshold that referred input mixer depends gain from mixer input field strength sensor setting field strength offset (bit 21). Table Soft Mute Threshold
Relative Soft Mute Threshold Soft mute
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Table Maximum Soft Mute
Maximum Value Soft Mute
Figure Soft Mute
(Pin9) Gain FM-Demodulator 68.70
Output
output demodulator mode) output demodulator (FM/WB mode) available output (pin 11). output signal muted setting bandwidth low-pass filter output means kHz. Table Output Mute
Output out, normal operation Mute
Table Output Bandwidth
Bandwidth Low-pass Filter
Receiving Condition Analyzer
T4258N implements several sensors that provide information about receiving condition selected station.
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Field Strength Sensor
field strength sensor provides voltage which represents logarithmic field strength signal reception band. field strength information retrieved either from level detector input mixer (pin from IF-AGC depending setting bandwidth field strength detection smaller than using level detector because additional selectivity between mixer amplifier particularly field strength detection limited range. Usually field strength from level detector used FM/WB mode field strength used mode. field strength output adjusted bits steps. This offset also influence soft mute levels. Table Field Strength Offset
Offset Field Strength
Field Strength Selection
allows switches between narrow-band field strength wide-band field strength information. Table Field Strength (Combined)
Field Strength (Pin Narrow-band/Wide-band field strength (wide band) Multipath field strength field strength (wide band) field strength (narrow band) Multipath field strength field strength (narrow band)
Search Stop Detector
search stop detector available FM/WB mode. STOP condition signaled (with level frequency signal within window around center frequency kHz. width this search stop window range kHz. frequency signal measured counting number periods signal during measurement time which determined inverted STOP signal available according Table page frequency 10.25 used time reference. Table Search Stop Detector Measurement Time
Time Window Stop Signal 3.1969 3.1969
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Table Search Stop Window
Search Stop Window ±0.5 ±1.1 ±2.3 ±4.8
Table Signals Available Digital Output
Note: (AM) (FM/WB) (AM) (FM/WB) (Pin MPINT STOP (STOP MPINT)
MPINT Multipath interrupt, Stop MPINT signal active
(IFAGCH) carried along with (IFAGCL) avoid crackles during change search stop mode reception mode.
Deviation Sensor
deviation sensor active FM/WB mode measures modulation signal. implemented peak detector low-pass-filtered signal (see Figure output voltage proportional frequency deviation FM/WB modulation depth respectively. Figure Deviation Sensor
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Adjacent Channel Sensor
adjacent channel sensor active mode only measures field strength outside reception band. Figure Adjacent Channel Sensor
SMeter
(Meter)
(ADJAC)
MPINT ADJAC Reset allows resets multipath sensor adjacent channel sensor connecting internally ground external capacitors discharged very quickly. Table Multipath Adjacent Channel Reset
MPINT Adjacent Channel (Pin Normal mode Connection ground
Multipath Sensor
multipath sensor active mode only measures disturbance multipath reception. multipath sensor detects drops field strength after integrated band filter calculating difference between averaged maximum field strength current field strength. maximum depth these drops represented voltage peak detector (MULTIP). level this voltage represents degree disturbance received signal. Figure Multipath Sensor
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Multipath Noise Canceller (MNC) implemented reduce disturbance received signal multipath reception conditions. difference between momentary averaged field strength falls below threshold adjustable (see Table 32), signal muted this situation (MPINT) signalized (INT) according Table page Muting signal during multipath disturbances activated setting Table Multipath Noise Canceller
Multipath Noise Canceller Active active
Table Sensitivity
Sensitivity (Threshold) (-33 Normal (-14 High Note: Valid mode (bit
Multipath interupt also switched on/off Table Multipath Interrupt (MPINT)
MPINT (Pin (MPINT active)
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Noise Blanker
Noise Blanker T4258N activated noise peak detected field strength first disturbance exceeds level defined bits signal muted second Table Noise Blanker Activation
Noise Blanker
Table Sensitivity Noise Blanker
Noise Blanker Sensitivity Normal High
3-wire Description
register settings T4258N programmed 3-wire protocol. protocol consists separate commands. defined number bits transmitted sequentially during each command. command used program bits register. different registers available (see Table page addressed length command (number transmitted bits) three address bits that unique each register given length. 8-bit registers programmed 8-bit commands 24-bit registers programmed 24-bit commands. Each command starts with rising edge enable line (EN) ends with falling edge kept HIGH during command. sequence transmitted bits during command starts with first byte ends with last byte register addressed. DATA evaluated rising edges CLK. number HIGH transitions during HIGH period used determine length command. protocol register addressing T4258N compatible addressing used U4256BM. That means both T4258N U4256BM operated same 3-wire shown application circuit (Figure page 36).
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Figure Pulse Diagram
8-bit command
DATA
BYTE
24-bit command
DATA
BYTE BYTE BYTE
Figure Timing
Enable Data tHDA Clock tHEN
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Data Transfer
Table Control Registers
A24_100
ADDR. BYTE Demodulator AM/FM/WB Gain amplifier Search Width window BYTE divider/multipath sensitivity Field strength MPX/ LPF/ BYTE Time window stop signal
A24_101
BYTE BYTE ampl. Mixer BYTE
ADDR.
WBDemod-gain
Start soft mute threshhold
Soft mute depth
Tk-FM
threshold AM/FM
mixer
Int. reference shift
IFOUT IF2IN Dem. Contr.
Gain local
A24_111
ADDR. BYTE Local BYTE Offset field strength (Pin Band-path filter BYTE
change (test mode bits)
Fieldst. Local (Pin prescaler (VCO-Buffer)
A8_100 ADDR. BYTE Test mode Mute (Pin Reset NoiseMP/ blanker
A8_101 ADDR. BYTE Band-path filter Band width
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Absolute Maximum Ratings
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. This stress rating only functional operation device these other conditions beyond those indicated operational sections this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability. voltages referred (pin
Parameters Symbol Value Unit
Supply voltage, Power dissipation Junction temperature Ambient temperature range Storage temperature range
Ptot Tamb Tstg
1000 +150
Thermal Resistance
Parameters Symbol Value Unit
Junction ambient, soldered
RthJA
Operating Range
voltages referred (pin
Parameters Symbol Min. Typ. Max. Unit
Supply voltage range Ambient temperature
Tamb
Electrical Characteristics
Test conditions (unless otherwise specified): Tamb 25°C
Parameters Power Supply Test Conditions Symbol Min. Typ. Max. Unit Type*
Supply voltage Supply current Supply current Standby mode (bit Other operation modes
IStby
(Bit
Frequency range bias voltage Buffer output voltage Buffer output resistance fosc
fVCO
mVrms
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
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Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): Tamb 25°C
Parameters Test Conditions Symbol Min. Typ. Max. Unit Type*
Buffer output voltage
RF-AGC
Saturation voltage Saturation voltage Threshold level Maximum threshold level input signal input signal In-band signal Out-of-band signal (110 MHz),
dBµV dBµV
RF-AGC, Mode (Bit
Saturation voltage Saturation voltage Output voltage minimum gain Output voltage minimum gain Maximum control voltage Maximum control voltage Minimum control voltage Maximum threshold level
input signal input signal signal signal active Bits
dBµV
Mixer, Mode (Bit
Supply current Conversion conductance 3rd-order input intercept point Noise figure (SSB) Input bias voltage Input resistance Input capacitance Maximum output voltage Output resistance
current pins
dBµV
AC-grounded Generator resistance (pin Single-ended, AC-grounded
IP3AMmix NFAMmix 2.45
Differential
Mixer Mode (Bit
Supply current
current pins
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
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Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): Tamb 25°C
Parameters Test Conditions Symbol Min. Typ. Max. Unit Type*
Conversion conductance 3rd-order intercept point Noise figure (DSB) Input resistance Input capacitance Maximum differential output vltage Output resistance
Generator resistance AC-grounded Bits AC-grounded AC-grounded TKmin TKmax IP3FMmix NFFMmix
dBµV
Amplifier, Mode (Bit
Minimum voltage gain Temperature coefficient gain Temperature coefficient gain Input resistance Input capacitance Output resistance
0.039 0.044
dB/K dB/K
Amplifier, Mode (Bit
Maximum voltage gain Gain control range Noise figure Input resistance Input capacitance Output resistance
load
Generator resistance AC-grounded Generator resistance (pin
NFIFAM
NFMix2 IP3Mix2
Mixer
supply current AM/WB supply current Conversion conductance Noise figure (SSB) 3rd-order input intercept point AM/WB output resistance
dBµV
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
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Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): Tamb 25°C
Parameters Test Conditions Symbol Min. Typ. Max. Unit Type*
Maximum differential output voltage AM/WB Maximum differential output voltage Input resistance input voltage input resistance input bias voltage
9.10 9.11 9.12
AC-grounded AM/WB mode (Bit mVrms AM/WB mode (Bit Unmodulated signal, dBµV active) Small signal Deviation kHz, fmod Deviation kHz, fmod (reference: kHz) Deviation kHz, fmod Dev. ±22.5 kHz, fmod kHz, de-emphase, signal input (pin (pin Modulation depth 30%, fmod
mVpp
Amplifier (Bit
10.1 10.2
Input resistance Voltage gain
10.3 10.4
Gain control range output voltage
10.5
output voltage
mVrms
10.6
Output impedance
Demodulator Integrated Band-filter, Mode (Bit Setting Filter
11.1
output voltage
mVrms
11.2
Stereo roll-off Total harmonic distortion Maximum signal-tonoise ratio
-2.0
11.3
THDFM
11.4
(S/N)FM
Soft Mute, Mode (Bit
12.1 12.2
Mute gain Mute gain
Demodulator, Mode (Bit
13.1
output voltage
mVrms
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
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T4258N
Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): Tamb 25°C
Parameters Test Conditions Symbol Min. Typ. Max. Unit Type*
13.2
Total harmonic distortion Maximum signal-to-noise ratio
Output
Modulation depth 80%, fmod V(pin const. Modulation depth 30%, fmod dBµV dev. kHz, fmod Small signal
THDAM
13.3
(S/N)AM
14.1 14.2 14.3
output voltage Mute gain Output resistance saturation voltage output resistance HIGH saturation voltage HIGH output resistance
Search Stop Detector, Output
15.1 15.2 15.3 15.4
5.25
Deviation Sensor, Mode (Bit
16.1
Offset voltage
dev. demodulator adjusted dev. kHz, fmod dBµV Unmodulated signal dBµV
16.2
Output voltage
Field Strength Sensor, Mode (Bit
17.1 17.2
Output voltage Output voltage
Field Strength Sensor, Mode (Bit
17.3 17.4
Output voltage field strength Output voltage HIGH field strength
dBµV dBµV
Multipath Sensor, Mode (Bit
18.1
Offset voltage
Unmodulated signal, dBµV modulation depth 60%, fmod kHz, dBµV
18.2
Output voltage
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
4566B-AUDR-02/04
Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): Tamb 25°C
Parameters Test Conditions Symbol Min. Typ. Max. Unit Type* Adjacent Channel Sensor, Mode (Bit (Default Setting)
19.1 19.2
Offset voltage
Unmodulated signal mod. fmod mod. fmod
Output voltage 19.3
3-wire
20.1 20.2 20.3 20.4 20.5
Input voltage Input voltage HIGH Leakage current Clock frequency Period HIGH Rise time DATA, Fall time DATA, Set-up time Hold time Hold time DATA
Internally Generated Reference Voltages
20.6 20.7 20.8 20.9 20.10
tHEN tHDA
21.1 21.2 21.3 21.4
Output voltage Output voltage Output voltage Output voltage
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
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Application Information
Prescaler (Divider) Settings
mixer used conversion reception frequency frequency. Therefore prescaler implemented generate necessary from frequency. reception band different prescaler (divider) settings possible. Table gives example prescaler (divider) settings reception frequencies. e.g., fVCO 98.2 10.7
Prescaler
Table Prescaler (Divider) Settings Reception Frequencies
Divider Prescaler) Minimum Reception Frequency Maximum Reception Frequency [MHz] [MHz]
divide divide divide divide divide divide divide divide divide Note:
38.4 20.033 13.85 8.94 5.667 3.329 1.575 0.211
51.3 30.633 20.3 14.1 9.967 7.014 3.078
Prescaler Divider this example.
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Local Oscillator Prescaler Settings
Table gives example prescaler divider prescaler divider settings reception frequencies. e.g., fVCO 195.9 237.9 +10.7 -10.7 fVCO (frec fIF) Prescaler Prescaler
Table Prescaler (Divider) Settings Reception Frequencies
Band Prescaler [MHz] Minimum Reception Maximum Reception Frequency [MHz] Frequency [MHz] Minimum Frequency Maximum Frequency Prescaler
LW/MW 120m
+10.7 -10.7 -10.7 +10.7 +10.7 +10.7
87.5 162.4 0.15 17.5
162.55 1.605 17.9
196.4 227.55 195.9 195.3 225.6
237.4 227.775 237.9 221.49 228.8 211.2
U4256 R-divider Calculation
Mode
fVCO -VCO-divider Prescaler step fVCO VCO-divider Prescaler
FM/WB Mode
-VCO-divider step fVCO VCO-divider
Modes
step
fref reference oscillator frequency (e.g. 10.25 MHz) fVCO frequency frec reception frequency fstep step frequency PLL)
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Diagrams
following data measured with application board (see Figure 20). measurement setup, generator terminated connected antenna input series resistor achieve termination antenna input. generator level specified output voltage this generator load. application board replaced resistor, voltage this resistor below specified voltage level generator. Figure Demodulator Integrated band-filter setting: (bits modulation frequency; de-emphasis (THD)
+85°C
Output Voltage [Vrms]
-40°C -40°C
+85°C
Frequency Deviation [kHz]
Figure Multipath Sensor modulation frequency kHz; generator level dBµV
Sensor Output Voltage
+85°C
-40°C
Modulation Depth
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Figure Multipath Sensor Frequency Response Generator level dBµV
Sensor Output Voltage
1000 10000 100000
85°C 25°C -40°C 25°C -40°C
Modulation Frequency [Hz]
Figure Deviation Sensor modulation frequency: kHz; setting filter kHz; demodulator fine tuning (bit
Deviation Sensor Output Voltage
+85°C
-40°C
10000
30000
50000
70000
90000
Frequency Deviation [Hz]
center frequency integrated band filter adjusted (e.g., center frequency 462.50 kHz).
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Figure Deviation Sensor Frequency Response frequency deviation: 22.5
Sensor Output Voltage
1000 10000 100000
Modulation Frequency (Hz)
Figure Input Level Sweep Soft mute threshold bits soft mute gain gain amplifier
Input Level [dBµV]
Fieldstrength Sensor Output Voltage
Output [dB]
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Figure Selectivity Integrated bandfilter setting: Desired signal level adjusted without undesired signal Undesired signal level adjusted
Pdes/Pundes
Adjacent
Pdes/Pundes [dB]
-300 -250 -200
-150 -100
Frequency Offset [kHz]
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Adjacent Channel Output Voltage
T4258N
Figure Test Circuit
Test Point Quarzoscillator 10.25 100n 100n 100n 100n
T4258N
200k 100n
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Figure Application Circuit
R407 C308 100n KR202 X301 KF302 R305 F201 C307 C206 220n C310 C205 T4258 R313 C133 R102 F131 F102 C107 BB804 R121 D131 R131 C134 U4256BM F101 BB804 R122 D101 C102 S391D D103 C103 C159 C158 C157 ADJAC C115 100n C116 100n Application Board Schematic METER C151 R151 C152 330p DAC3 SWO1 SWO3 SWO2 SWO4 T101 BFR93A C104 BB804 R104 R112 C106 L102 C155 100n C153 Q151 C154 10.25 D102 C110 470p C156 C108 C109 220n C203 C114 C131 C132 IF2OUT DATA 220n C207 220n C312 R152 C208 C309 F302 C204 470n C111 100p R303 R106 C201 100n KR201 R304 MULTIP (+8.5 10.5 F201 C209 C112 C113 100n R111 200k C202
T4258N
L302
C319
100uH
C306
R311
L303
R105
R115
T102 BC858
T302
BC848
C316
R308 T301
220n
858C
R306 470k
T111 J109
R307
C315
C302
220n
C117
L301
D301
S391D
D302 S391D
C311
100n
R103
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T4258N
Ordering Information
Extended Type Number Package Remarks
T4258N-ILS T4258N-ILQ
SSO44 SSO44
Tube Taped reeled
Package Information
Package SSO44
Dimensions
18.05 17.80 9.15 8.65 7.50 7.30
2.35 16.8 0.25 0.10
0.25 10.50 10.20
technical drawings according specifications
4566B-AUDR-02/04
Atmel Corporation
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4566B-AUDR-02/04

AM/FM Receiver T4258N Electrostatic sensitive device. Observe pre

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