TEA5777HN-T NXP Semiconductors, TEA5777HN-T Datasheet - Page 14

• Manufacturer Part Number: TEA5777HN-T
• Description: Tuners AM/FM STEREO
• Manufacturer: NXP Semiconductors

Specifications of TEA5777HN-T

• Bus Type: I2C, 3-Wire
• Maximum Frequency: 2.047 MHz, 409.55 MHz
• Minimum Frequency: 0.512 MHz, 51.2 MHz
• Modulation Technique: AM, FM
• Mounting Style: SMD/SMT
• Package / Case: HVQFN-48
• Function: Radio
• Operating Supply Voltage: 3 V
• Supply Voltage (min): 2.7 V
• Supply Voltage (max): 7 V
• Minimum Operating Temperature: - 10 C
• Maximum Operating Temperature: + 65 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: TEA5777HN/N2,518

Philips Semiconductors
TEA5777_1
Product data sheet
8.4.1 Reference frequency generation
8.4.2 Crystal oscillator
8.4.3 IF counter
8.4.4 Automatic search operation
The internally required reference frequency can be obtained from the integrated crystal
oscillator or from an externally applied reference signal of 13 MHz. Selection of the
reference signal (internal or external) takes place via the bus control.
The reference frequency signals are used for:
The symmetrical crystal oscillator can operate with a 4 MHz clock crystal. An amplitude
control function is implemented in order to minimize the higher harmonic component
signal levels.
An IF counter has been added for search-stop detection (optional, i.e. can be enabled or
disabled via bit IFCE). The IF counter result is a 1-bit output and in-window yes or no and
available via bus control. In order to minimize the interference, the IF counter can be
disabled via the bus control bit IFCE. In both AM and FM modes, two IF window settings
can be chosen by bit IFW.
When Dbus mode is activated and bit IFCE = 1, the IF counter result is available at pin
DATA (see
DATA. Disabling bit IFCE, while Dbus mode is active, puts the mono or stereo indication
information on pin DATA. In this case no bus actions are required to read the status of the
IF counter (silent readout).
Remark: For updating the IF counter information a short pulse on pin WRITE_READ
should be generated.
The IC can be programmed to an autonomous search mode operation. In this mode, the
IC will search for a new station without the need of communication to the microcontroller.
To enable this mode, bit SEARCH has to be set. Under control of bit UPDWN, search stop
level bits SLEV[1:0] and search step control bits STEP[1:0], various search modes can be
selected (see
Before this mode can be activated, first the upper and lower band limits have to be
programmed. Bit PROGBLIM = 1 and bit UPDWN = 1 programs the upper band limit,
while bit PROGBLIM = 1 and bit UPDWN = 0 programs the lower band limit. Bit SFOUND
signals whether a new station is found. Bit BLIM signals whether a band limit is reached.
In AM mode, bit AMDELAY selects either a 40 ms or 80 ms delay time. The best value to
be selected depends on the realized AM IF AGC response (see
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Reference frequency divider for the PLL synthesizer
Center frequency adjustment of the IF filters
Free running frequency adjustment of the stereo decoder VCO
Clocking the stereo decoder state machine
Timing of the IF counter
Sampling the RF level for the level ADC
Table
Section
8). In this mode, the IF counter ready flag (bit IFCRDY) is put on pin
9).
Rev. 01 — 11 April 2006
Low-power AM/FM stereo radio for handheld applications
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Section
TEA5777
8.1.6).
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