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TEF6862 Datasheet(PDF) 7 Page - NXP Semiconductors |
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TEF6862 Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 65 page  TEF6862_1 © Koninklijke Philips Electronics N.V. 2006. All rights reserved. Product data sheet Rev. 01 — 14 September 2006 7 of 65 Philips Semiconductors TEF6862 Car Radio Enhanced Selectivity Tuner (CREST) 7. Functional description 7.1 FM mixer 1 The FM quadrature mixer converts FM RF (65 MHz to 108 MHz and 162.4 MHz to 162.55 MHz) to an IF of 10.7 MHz. The FM mixer provides inherent image rejection and a large dynamic range. The image rejection can be switched from low injection LO to high injection LO via the I2C-bus independently of the band selection. The gain can be increased by 6 dB via the I2C-bus. 7.2 FM RF AGC AGC detection at the FM front-end mixer input with programmable threshold. When the threshold is exceeded, the PIN diode drive circuit sources a current to an external PIN diode circuit, keeping the mixer input signal level constant. Keyed AGC function is selectable via the I2C-bus and uses the in-band level information derived from the limiter level detector. The AGC PIN diode drive circuit can be forced via the I2C-bus to deliver a fixed current as a local function for search tuning. In AM mode, the AGC PIN diode drive circuit can also be forced via the I2C-bus to deliver the maximum source current into the external FM PIN diode circuitry. AGC information is available via the I2C-bus. 7.3 FM mixer 2 The FM quadrature mixer converts 10.7 MHz FM IF1 to 450 kHz FM IF2 and includes inherent image rejection. The gain can be selected via I2C-bus to compensate for different ceramic filter insertion loss. AFSAMPLE 51 AF sample flag output AFHOLD 52 AF hold flag output and input MPXAM 53 not muted FM or AM demodulator output and IF output for AM stereo MUTIN 54 input of tuning mute circuit MUTMPXAM 55 FM MPX output or AM output from tuning mute LEVEL 56 level voltage output for AM and FM SWPORT2 57 software port output 2 DGND 58 digital ground SDA 59 I2C-bus data line input and output SCL 60 I2C-bus clock line input ADDR 61 address select i.c. 62 internally connected XTAL2 63 crystal oscillator 2 XTAL1 64 crystal oscillator 1 Table 3. Pin description …continued Symbol Pin Description |
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Similar Description - TEF6862_15 |
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