QN8075 查看數據表（PDF） - Unspecified

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QN8075

Single Chip Low Power FM Receiver for Portable Devices

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3 Functional Description

The QN8075 is a high performance, low power, single chip FM receiver IC that supports worldwide FM broadcast band (60

to 108MHz).

Figure 3 QN8075 Functional Blocks

The QN8075 integrates FM receive functions, including

RF front-end circuits (LNA, Mixer and channel

selective filter etc), a fully digitized FM demodulator,

MPX decoder, de-emphasis and audio processing (SM,

HCC, and SNC). Advanced digital architecture enables

superior receiver sensitivity and crystal clear audio. The

QN8075's Auto Seek function enables automatically

selecting the channel of better sound quality.

The QN8075 supports a small footprint, high level of

integration and multiple crystal clock frequencies.

These features make it easy to be integrated into a

variety of small form-factor, low-power portable

applications. Low phase noise digital synthesizers and

extensive on-chip auto calibration ensures robust and

consistent performance over temperature and process

variations. An integrated voltage regulator enables

direct connection to a Li-ion battery and provides high

PSRR for superior noise suppression. A low-power

IDLE and Standby mode extends battery life.

3.1 FM Receiver

The QN8075 receiver uses a highly digitized low-IF

architecture, allowing for the elimination of external

components and factory adjustments.

The received RF signal is first amplified by an integrated

LNA and then down converted to an intermediate

frequency (IF) via a quadrature mixer. To improve image

rejection (IMR), the quadrature mixer can be

programmed to be at high-side or low-side injection. An

integrated IF channel filter rejects out-of-channel

interference signals. AGC is also performed

simultaneously to optimize the signal to noise ratio as

well as linearity and interference rejection. The filtered

signal is digitized and further processed with a digital

FM demodulator and MPX decoder. Audio processing is

then performed based on received signal quality and

channel condition. Two high-quality audio DACs are

integrated on chip to drive the audio output.

A receive signal strength indicator (RSSI) is provided

and can be read from RSSIDB [7:0]. Figure 4 shows the

curve of RSSI vs. different RF input levels. Auto seek

utilizes RSSI to search for available channels.

Rev 0.2c (09/02)

Copyright ©2011 by Quintic Corporation

Page 9

Confidential A

Confidential Information contained herein is covered under Non-Disclosure Agreement (NDA).

Advance Technical Information. This is a product under development. Characteristics and specifications are subject to change without notice.

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