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Features
* * * * * * * * * * * * * * * * * * * * * * *
World Tuner Application Due to Integrated VCO Dividers RF Input for Weather Band Applications AM Reception 100 kHz Up to 30 MHz AM Up/Down Conversion Depending on Reception Frequency VCO Slave Mode for Phase Diversity Applications FM Image Rejection Mixer Selectable High-side/Low-side Injection for FM Mode Selectable FM Mixer Output RF-AGC Wideband Threshold Programmable for AM and FM RF-AGC Inband Threshold Programmable Cascode Control Voltage for AM FET Pre-stage Integrated Pin-diode Drivers for AM and FM Three Selectable IF Amplifier Inputs Fractional PLL with Fast Lock Time Small Frequency Steps for AM Excellent SNR for DRM Applications Differential Reference Frequency Input for PLL Down to 9 kHz or Integrated XCO Driver Available Two Wire Interface (TWI) with Two Selectable Bus Addresses Digital Electronic Alignment of Up to Two External Filter Stages Flexible and Economic IF Filter Concept Control Inputs for IF Gain, Reception Frequency and Keyed AGC Integrated State-machine for Optional Control of Alternative Frequency Check Only One Power Supply Voltage Necessary
Broadcast Radio Front-end IC for AM/FM/DRM/HD Radio ATR4262M1 Summary Preliminary
1. Description
The ATR4262M1 is a single-chip AM/FM and weather band tuner dedicated for digital IF solutions in car-radio applications. ATR4262M1 is produced using Atmel (R) 's advanced BICMOS2S technology and fulfills the automotive requirements. This part is suitable for HD RadioTM reception as well as for DRM solutions. The high flexibility allows to design high performance and cost optimized tuner solutions.
NOTE: This is a summary document. The complete document is available under NDA. For more information, please contact your local Atmel sales office.
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2. Pin Configuration
Figure 2-1. Pinning QFN48
AMOUT1 AMOUT2 AMAGCTC1 FMOUT1 FMOUT2 VST IFIN1 IFREF IFIN2 VRT IFIN3 AMAGCT2 AMIN1 AMIN2 AMCVC AMPIND SW1 FMPIND FMIN1 FMIN12 FMIN2 DAC1 DAC2 SW2 48 47 46 45 44 43 42 41 40 39 38 37 36 1 35 2 34 3 33 4 32 5 31 6 ATR4262M1 30 7 29 8 28 9 27 10 26 11 25 12 13 14 15 16 17 18 19 20 21 22 23 24 FMAGCTC KAGC IFGCL IFGCM ENABLE SDA SCL AFCC VRVCO VCOB VCOE GNDVCO SW3 IFOUT1 IFOUT2 VSPLL REF1 REF2 VRPLL AMLF FMLF VTUNE GNDPLL VCOBUF
Table 2-1.
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
Pin Description
Symbol AMIN1 AMIN2 AMCVC AMPIND SW1 FMPIND FMIN1 FMIN12 FMIN2 DAC1 DAC2 SW2 FMAGCTC KAGC IFGCL IFGCM ENABLE SDA SCL Function AM mixer input AM mixer input AM cascode voltage output AM pin diode output SW1 switching output FM pin diode output FM mixer input 1 FM mixer input 12 FM mixer input 2 DAC tuning voltage output 1 DAC tuning voltage output 2 SW2 switching output/external tuning voltage input RF AGC FM time constant Keyed AGC input/SW7/lock detect/AFSAMPLE IF gain control LSB/SW4 IF gain control MSB/SW5 Control bus ENABLE/address select Two-wire control bus SDA Two-wire control bus SCL
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ATR4262M1 [Preliminary]
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ATR4262M1 [Preliminary]
Table 2-1.
Pin 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Die pad
Pin Description
Symbol AFCC VRVCO VCOB VCOE GNDVCO VCOBUF GNDPLL VTUNE FMLF AMLF VRPLL REF2 REF1 VSPLL IFOUT2 IFOUT1 SW3 AMAGCTC2 IFIN3 VRT IFIN2 IFREF IFIN1 VST FMOUT2 FMOUT1 AMAGCTC1 AMOUT2 AMOUT1 GNDT_PAD Function AFC control input/SW6 switching output/lock detect/AFHOLD Reference voltage VCO VCO resonator (base) VCO resonator (emitter) VCO ground VCO buffer output/input PLL ground Tuning voltage output PLL loopfilter FM PLL loopfilter AM Reference voltage digital RefClockInput2/crystal oscillator RefClockInput1/crystal oscillator Supply voltage digital input IF output 2 IF output 1 SW3 switching output/lock detect/AFSAMPLE RF AGC AM time constant 2 IF amplifier input Reference voltage tuner IF amplifier input IF reference voltage IF amplifier input Supply voltage tuner FM mixer output FM mixer output RF AGC AM time constant 1 AM mixer output/FM Mixer Output 4 AM mixer output/FM Mixer Output 3 Tuner RF and IF Ground
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3. Absolute Maximum Ratings
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Pin Group Digital Supply Voltage references Voltage SW1, SW3 SW2 SW4, SW5, SW6, SW7 Mixer outputs Analog Current Ambient temperature Storage temperature Junction temperature Power dissipation ESD HBM ESD MM Switches Tamb Tstg Tj Ptot All pins All pins -2 -200 Min. -0.5 -0.5 -0.5 -0.5 -0.5 -0.5 -0.5 -0.5 0 -40 -40 Max. +5.5 +12 +6.4 +12 VS + 0.5 + 5.5 +16 VS + 0.5 2.7 +100 +100 +150 1.4 +2 +200 Unit V V V V V V V V mA C C C W kV V
4. Thermal Resistance
Parameters Thermal resistance junction-ambient Test Condition Soldered to PCB Symbol RthJA Value 30 Unit K/W
5. Operating Range
Parameters Supply voltage Supply voltage for operation of control bus (data preservation in bus registers is guaranteed) Ambient temperature Symbol VS VS Tamb Value 8 to 10 7 to 10 -40 to +90 Unit V V C
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ATR4262M1 [Preliminary]
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ATR4262M1 [Preliminary]
6. Functional Description
The ATR4262M1 front end is designed for world-tuner applications. Due to its flexible divider arrangement, the tuner can be used for reception from 100 kHz to 163 MHz. The field of use covers all the common radio broadcast services from AM-LW to AM-SW (up to 30 MHz) and from FM-OIRT to US weatherband. The tuner application can be easily adapted to the requirements of DRM and HD-radio (IBOC). * FM section The ATR4262M1 contains a high performance FM image rejection mixer, which helps to reduce the demands and the cost of the front end application. The FM mixer output can be switched to an alternative pair of pins to allow different IF filter concepts for FM mode. Two selectable inputs can be used for independent FM front end sections. * AM section The AM section contains a dedicated AM prescaler for the LO signal. Very small tuning steps are possible using this divider, while at the same time a high PLL comparison frequency guarantees excellent phasenoise behavior. * RF-AGC Both AM and FM signal paths have their own RFAGCs with a wideband and a inband detector with individual thresholds. The thresholds for AM and FM can be programmed in 2 dB steps. An optional keyed AGC function reduces the wideband AGC threshold up to 6 dB in order to avoid desensitization of the tuner. Pin diode drivers for AM and FM are integrated to reduce cost for external components. In addition to the pin diode control, a cascode control voltage for the external LNA is provided by the AM-AGC block. * IF stage The IF amplifier has three selectable inputs, which can be matched to any common IF filter impedance by external components. With these inputs, the tuner application can be easily adapted to different broadcast standards, while conventional standards are still possible. Gain can be set via pins or by setting bits, which makes the ATR4262M1 very versatile and easy to adapt to different baseband architectures. * Fractional PLL The ATR4262M1 contains a complete fractional PLL, which guarantees fast lock time, low phase noise and small tuning steps. A reference clock frequency from 9 kHz up to 21 MHz provided by, for example, baseband can be used. Alternatively the integrated XCO with standard crystals from 10 MHz to 21 MHz can be used as the reference for the PLL. * Double tuner concept Like phase diversity or background tuning, double-tuner applications are also possible. For phase diversity applications, the tuner can also operate in slave mode with a master tuner providing the VCO frequency for both tuners. * Digital electronic alignment Two independent gain and offset programmable DACs are available to tune the FM front end section. The PLL's tuning voltage is used as input for the DACs to ensure proper tracking to the reception frequency. In slave mode, the tuning voltage of a master tuner must be applied to a dedicated input pin.
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* Alternative frequency check An optional state machine can control the alternative frequency check sequence for some common basebands. This feature reduces the CPU load of the main controller because the statemachine outputs the signals with the correct timing for quality check and muting of the baseband. * Switching outputs Up to seven general-purposes open-drain switches are available to simplify the customer application. * Two-wire control interface The ATR4262 can be programmed via a fast-mode TWI bus interface. Two different IC addresses can be selected to allow two tuners at the same bus segment. Various programming bits allow unique flexibility of operation modes. A tuner status byte provides information about the receiving conditions and the PLL status. * Package and power supply The ATR4262 comes in a small outline QFN48 package to allow small and cost-effective tuner applications. A single 8V to 10V supply voltage is sufficient to operate the ATR4262 and to reduce the complexity of the customer application.
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ATR4262M1 [Preliminary]
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ATR4262M1 [Preliminary]
7. VCO and AM Prescaler Settings
Table 7-1 gives an example of the VCO divider and AM Prescaler settings and the reception frequencies.
Table 7-1.
Typical VCO Divider, AM Prescaler Settings, and Reception Frequencies
VCOdivider (DFM) 2 3 1 3 3 N-div. Prescaler (DPLL) 2 3 2 3 3 2 2 2 2 2 2 2 Min. Reception Frequency [MHz] 87.5 76 162.4 65.8 65.8 0.15 0.15 2.3 5.95 7.1 9.5 21.45 Max. Reception Frequency [MHz] 108 90 162.55 74 74 1.605 1.605 2.5 6.2 7.35 9.9 21.85 Min. VCO Frequency 196.4 195.9 173.1 229.5 165.3 217 195.3 208 199.8 213.6 202 192.9 Max. VCO Frequency 237.4 237.9 173.25 254.1 189.9 246.1 221.49 211.2 202.8 216.6 206 195.3 AMPrescaler (DAM) 10 9 8 6 6 5 3
Band FM JPN WB OIRT OIRT LW/MW LW/MW 120m ... 49m 41m 31m ... 15m
IF [MHz] +10.7 -10.7 +10.7 +10.7 -10.7 +10.7 +10.7 +10.7 +10.7 +10.7 +10.7 +10.7
A small VCO frequency range of e.g., 195.3 MHz to 237.9 MHz allows reception of the most important bands like FM, JPN, LW, MW, 49m, 41m, and 31m.
8. Power Supply
There is only one power supply voltage (8V to 10V) necessary for operation of the ATR4262M1.
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9. IF Filter Stage Concept
There are several different IF filter concepts possible depending on the broadcast standard and the targeted quality range of the tuner. For that purpose a programmable switch for the FM mixer output as well as three programmable inputs for the IF amplifier is available.
Table 9-1.
IF Filter Stage Configuration
FMOUT Not used or connected to AMFMOUT Mixer tank Ceramic filter (BW 180 kHz) Not used or connected to AMFMOUT Mixer tank Ceramic filter (BW 180 kHz) Mixer tank Ceramic filter (BW 400 kHz) Not used or connected to AMFMOUT Mixer tank Ceramic filter (BW 400 kHz) AMFMOUT Mixer tank Ceramic filter (BW 180 kHz) Mixer tank Ceramic filter (20 kHz) Mixer tank Ceramic filter (BW 180 kHz) Crystal filter (BW 7 kHz) Mixer tank Crystal filter (BW 7 kHz) Mixer tank Ceramic filter (BW 180 kHz) Mixer tank Ceramic filter (BW 400 kHz) Mixer tank Ceramic filter (BW 180 kHz) Ceramic filter (BW 30 kHz) Number of Mixer Output Tanks 1 2 Number of IF Filters 1 2
Configuration AM low cost AM ceramic filter (compatible to DRM) AM crystal filter AM crystal filter, separate tank HD Radio HD Radio low cost
1
2
2 2 1
2 2 1
HD Radio with AM filter
2
3
Figure 9-1.
Example of Simple IF Filter Stage Concept
RS2 180 +VS RF12 x RS1 1k8 RF1out y RKF2out 330 KF1 KF2 x + y = 300
F2
RKF1out 1k8 C
CF2in
CIF2in IFINFM
CIF1in IFINAM IFREF
MXFMOUT
Rin(IF2)
Rin(IF1)
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ATR4262M1 [Preliminary]
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ATR4262M1 [Preliminary]
10. Double Tuner Application
Figure 10-1. Double Tuner Operation
IFOUT1 IFOUT2 270 pF* REF CLK1 REF CLK2 IFOUT1 IFOUT2 270 pF*
1 H* 10 nF* 35 IFOUT1 ATR4262M1 REF2 31 100 pF VCOBUF 25 25 VCOBUF 31 34 IFOUT2 REF1 32 32 10 nF* 35
1 H* 34
IFOUT1 IFOUT2 REF1 ATR4262M1 REF2
VTUNE or DAC SDA Master ENABLE 17 10 nF SCL
27 or 10,11 18
12
SW2
18
SDA Slave ENABLE 17 5V (high)
19
19
SCL
ENABLE1
SDA
SCL
ENABLE2
*) optional
10.1
Two-Wire Interface-Bus Address Modes
To allow programming of both ICs (e.g., double tuner), SCL and SDA can be connected to both ICs. There are two different modes for ENABLE. For example, the ENABLE pin of the master IC is not connected (open mode). Only a capacitor to ground is required to avoid oscillations of the ENABLE pin. To program the master IC for open mode, the address byte C2h must be used. The ENABLE pin of the other IC (slave) has to be set to high. The applied voltage for high mode should be in the range of 2.5V to 5.3V. Address byte C0h is used as the slave in this case. Another possibility is the use of separate ENABLE lines which can be controlled by a microcontroller.
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11. Ordering Information
Extended Type Number ATR4262M1-PLQW Package QFN48 - 7 x 7 Remarks Taped and reeled
12. Package Information
Package: QFN 48 - 7 x 7 Exposed pad 4.5 x 4.5 (acc. JEDEC OUTLINE No. MO-220) Dimensions in mm Not indicated tolerances 0.05 1 max. 0.05-0.05 37 36
+0
7 5.5 4.5 48 1
48 1
technical drawings according to DIN specifications
0.23
12
25 0.40.1 24 13 0.5 nom.
12
Drawing-No.: 6.543-5089.01-4 Issue: 2; 24.01.03
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ATR4262M1 [Preliminary]
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ATR4262M1 [Preliminary]
13. Revision History
Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. Revision No. History * all pages: Part Number changed in ATR4262M1 * all pages: IBOC changed in HD Radio * Page 1: Features changed * Page 4: Table Absolute Maximum Ratings changed * Page 5: narrowband replaced by inband * Page 7: Last row changed * Page 9: Heading 22.1 changed * Page 10: Ordering Information changed
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