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参数资料
| 型号： | TEA5760UK/N1/S21,0 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA25 |
| 封装： | 3 X 2.80 MM, 0.60 MM HEIGHT, WLCSP-25 |
| 文件页数： | 34/37页 |
| 文件大小： | 209K |
| 代理商： | TEA5760UK/N1/S21,0 |
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TEA5760UK_1
NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 01 — 14 December 2006
5 of 36
NXP Semiconductors
TEA5760UK
Single chip FM stereo radio
6.
Functional description
6.1 Low noise RF amplier
The Low Noise Amplier (LNA) input impedance together with the LC RF input circuit
denes an FM band lter. The gain of the LNA is controlled by the RF AGC circuit to
prevent overdrive of the subsequent circuits.
6.2 FM mixer
The FM quadrature mixer converts the received RF (76 MHz to 108 MHz) to an IF of
225 kHz. Downconversion is achieved by multiplying the RF with the Local Oscillator (LO)
frequency. Image frequency suppression is achieved by using quadrature signal
processing.
6.3 VCO
The LC tuned VCO provides the LO signal for the FM quadrature mixer. The VCO
frequency range is 150 MHz to 217 MHz. No external varactor is required.
6.4 Reference frequency
An external 32.768 kHz reference frequency is used as the system clock. The reference
frequency specications are given in Section 10.
The reference frequency is used for:
Synthesizer PLL reference frequency
Timing for the IF counter
Adjustment of the frequency of the stereo decoder VCO
Auto alignment of the selectivity as well as the demodulator lters
6.5 PLL tuning system
The PLL synthesizer tuning system is designed to operate with a 32.768 kHz reference
frequency. A 14-bit word is used to tune the radio (see Table 11 and Table 12). Calculation
of this 14-bit word is as follows.
Formula for high-side injection:
Formula for low-side injection:
MPXOUT
E4
multiplex signal (MPX) output pin
VAFL
E5
left audio output
VAFR
E6
right audio output
Table 2.
Pin description …continued
Symbol
Pin
Description
N
DEC
4f
RF
f
IF
+
()
×
[]
f
ref
-------------------------------------------
=
N
DEC
4f
RF
f
IF
–
()
×
[]
f
ref
-------------------------------------------
=
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