參數(shù)資料
型號(hào)： TEF6701HL
廠商： NXP SEMICONDUCTORS
元件分類： 接收器
英文描述： Car radio tuner front-end for digital IF
中文描述： AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
封裝： 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-314-2, LQFP-64
文件頁(yè)數(shù)： 10/55頁(yè)
文件大?。?/td> 318K
代理商： TEF6701HL
9397 750 13471
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet
Rev. 01 — 16 November 2004
10 of 55
Philips Semiconductors
TEF6701HL
Car radio tuner front-end for digital IF
AM mixer 1 converts AM RF to an IF1 of 10.7 MHz, while AM mixer 2 converts IF1 of
10.7 MHz to an IF2 of 450 kHz:
LW from 144 kHz to 288 kHz
MW from 522 kHz to 1710 kHz (US AM band)
SW from 5.73 MHz to 9.99 MHz (including the 31 m, 41 m and 49 m bands).
7.11 AM RFAGC
The AM wideband AGC in front of the AM mixer 1 is realized first by a cascoded NPN
transistor, which controls the transconductance of the RF amplifier JFET with 10 dB of
AGC range. An AM PIN diode stage with 30 dB of AGC range is also 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 RFAGC loop is possible by using only a PIN diode. In some conditions,
noise behavior will increase. In this case pins VAMCAS and VAMCASFB have to be left
open-circuit. In FM mode, the cascode switches off the JFET bias current to reduce the
total power consumption. The PIN diode is biased by 1 mA in FM mode.
The AGC detection points for AM RFAGC are at the AM mixer 1 input (threshold
programmable via the I
2
C-bus) and the IF2 AGC input (fixed threshold).
7.12 AM noise blanker
The detection point for the AM noise blanker is the output stage of AM mixer 1, while
blanking is realized at the output of mixer 2.
7.13 AM IF2 AGC
This is a linear AM IF2 AGC amplifier. The gain controlled AM IF2 is output via the
multiplexed FM IF/AM IF2 buffer to a car IF DSP IC (e.g. SAA7724H).
7.14 FM IF and AM IF2 buffer
This buffers and multiplexes AM IF2 and FM IF to pin IFOUT.
7.15 FM and AM level detector
The 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
2
C-bus.
7.16 FM/AM RFAGC buffer
The output (open-collector) sinks a current which in AM mode is proportional to the
voltage at pin TRFAMAGC and in FM mode proportional to the RF level detector voltage
(pin TFMAGC) inside the FM AGC.
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TEF6721HL 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Car radio tuner front-end for digital IF
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TEF6721HL/V1,518 功能描述:調(diào)諧器 DIGITAL IF TUNER IC RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度:
TEF6721HL/V1,557 功能描述:調(diào)諧器 DIGITAL IF TUNER IC RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度:
TEF6721HL/V1S,518 功能描述:調(diào)諧器 CAR RADIO TUNER FRNT END FOR DIGITAL IF RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度:
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