TEA6848HL/V3S,557 NXP Semiconductors, TEA6848HL/V3S,557 Datasheet - Page 10

• Manufacturer Part Number: TEA6848HL/V3S,557
• Description: IC TUNER CAR RADIO 80LQFP
• Manufacturer: NXP Semiconductors

Specifications of TEA6848HL/V3S,557

• Modulation Or Protocol: AM, FM, WB
• Applications: AM/FM Radio Receiver
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 5V, 8.5V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Frequency: -
• Sensitivity: -
• Memory Size: -
• Data Rate - Maximum: -
• Current - Receiving: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed
• Other names: 935288832557

NXP Semiconductors
TEA6848HL_4
Product data sheet
7.4.2 AM RF AGC
7.4.3 AM detector
7.4.4 AM noise blanker
7.5 FM and AM level detector
7.6 IF2 filter gain alignment
AM mixer 1 converts AM RF to IF1 of 10.7 MHz, while AM mixer 2 converts IF1 of
10.7 MHz to IF2 of 450 kHz:
The AM wideband AGC in front of the first AM mixer is realized first by a cascaded NPN
transistor, which controls the transconductance of the RF amplifier JFET with 10 dB of
AGC range. Second, an AM PIN diode stage with antenna type and frequency dependent
AGC range is available. The minimum JFET drain source voltage is controlled by a DC
feedback loop (pin VAMCASFB) in order to limit the cascode AGC range to 10 dB. If the
cascode AGC is not required, a simple RF AGC loop is possible by using only a PIN
diode. In this event pins VAMCASFB and VAMCAS have to be open-circuit. In FM mode,
the cascade switches off the JFET bias current to reduce total power consumption. The
PIN diode is biased by 1 mA in FM mode.
The AGC detection points for AM AGC are at the first AM mixer input (threshold
programmable via the I
The AM output provides either a detected AM AF or the corresponding AM IF2 signal. The
IF2 signal can be used for AM stereo decoder processing. Soft mute function is controlled
by the I
The detection point for the AM noise blanker is the output stage of AM mixer 1, while
blanking is realized at the output of the mixer 2.
Trigger sensitivity can be modified by adding an external resistor at pin AMNBHOLD.
FM and AM level detectors provide the temperature compensated output voltage. The
starting points and slopes of the level detector outputs are programmable via the I
The 4-bit filter gain alignment reduces the change in IF filter gain spread when the
bandwidth is changed in dynamic mode from 155 kHz (maximum) to 25 kHz (minimum).
A frequency has to be chosen in the middle of European/US FM band, Japan band or
OIRT band (for East Europe) and the IC has to be set into dynamic bandwidth mode (IF2
bandwidth is 155 kHz).
Setting and clearing the FMBW bit continuously allows the adjustment of the gain
alignment to minimum change in AM/FM DC level.
•
•
•
LW = 144 kHz to 288 kHz
MW = 530 kHz to 1 710 kHz (US AM band)
SW = 5.73 MHz to 9.99 MHz (including the 31 m, 41 m and 49 m bands)
2
C-bus in AM mono mode.
Rev. 04 — 29 January 2010
2
C-bus) and the IF2 AGC input (fixed threshold).
New in car entertainment car radio tuner IC (NICE-PACS)
TEA6848HL
© NXP B.V. 2010. All rights reserved.
2
C-bus.
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