ST TDA7706 User Manual

TDA7706

Highly integrated tuner for AM/FM car-radio

Features

■FM, AM and weather band reception

■Fully integrated VCO for world tuning

■High performance PLL for fast RDS system

■Integrated AM-LNA and PIN diodes

■Automatic self alignment for FM front-end preselection filter and image rejection

■Integrated IF filters with high selectivity, dynamic range and adaptive bandwidth control

■Drift-free Digital-IF signal processing with high performance

■RDS demodulation with group and block synchronization

■High performance stereo decoder with noiseblanker

■Digital interface for HD Radio™ reception with digital audio blending

■Fully programmable DSP core

■I2C bus-controlled

■I2S input/output digital audio interfaces

■Single 5 V supply

■LQFP64 package

Description

The TDA7706 highly integrated tuner is a high/performance AM/FM tuner IC for car-radio applications, suitable for HD Radio™ reception.

Table 1. Device summary

Data brief −production data

'!0'03

LQFP64

It contains mixers and IF amplifiers for AM, FM and WX, fully integrated VCO and PLL synthesizer, IFprocessing including adaptive bandwidth control, stereo-decoder, RDS decoder, and digital interfaces for external HD Radio™ decoding on a single IC.

AM/FM IBOC or DRM base band filtering is available in parallel to standard analog reception.

The utilization of digital signal processing results in numerous advantages against today's tuners: very low number of external components, very small space occupation and easy application, very high selectivity due to digital filters, high customization possibility through software control, automatic alignment and a powerful DSP for custom processing.

Order code	Package	Packing
TDA7706CB	LQFP64 (10x10x1.4mm)	Tray

June 2012

Doc ID 022898 Rev 2

1/16

This is information on a product in full production. For further information contact your local STMicroelectronics sales	www.st.com
office.

Contents	TDA7706

Contents

1	Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 3
	1.1	Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
	1.2	Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4
2	Function description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		9
	2.1	FM - mixers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
	2.2	FM - AGC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
	2.3	AM - LNA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
	2.4	AM - AGC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
	2.5	AM - Mixers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
	2.6	IF A/D converters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
	2.7	Audio D/A converters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
	2.8	VCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
	2.9	PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10

2.9.1 Tuner PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.10 Crystal oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.11 DSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.12 HD Radio connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3	Application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		13
	3.1	Basic application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
4	Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		14
5	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		15

2/16	Doc ID 022898 Rev 2

TDA7706	Block diagram and pin description

1 Block diagram and pin description

1.1Block diagram

Figure 1. Functional block diagram

"LENDDCONTROL	FROM DECODER	2$3	- -AIN $30	#USTOM	$30	0,,32# )3	)NOUT $IGITAL AUDIO
"ASE)1"AND	DECODER)"/#TO	)"/#INTERF			-%-
		"LEND
			35
				)#
		.#/
		!$#		!$#		34%2%/ $!#	!UDIOO/UT
						/3#	-(Z
				6	&2%&	3UPPLY

		0,,
!'#	.	6#/
$!#	!'#

&- !-

'!0'03

Doc ID 022898 Rev 2

3/16

Block diagram and pin description	TDA7706

1.2Pin description

Figure 2. Pin connection (top view)

46$!#

4#&-

0,,TEST

'.0,,$

6##0,,

6##!$#?$!#

$!#OUT2

$!#OUT,

'.!$#?$!#$

6REFDEC

'.2%&$

/3#OUT

/3#IN

6##2%&

6$$)/6

6$$0,,6

&-0).$26

4EST

&-0).$DEC

6$$$#/2% 6

&--)8DEC

'.$. 6

&--)8 IN

'0)/

&--)8 IN

'0)/

'.$ 2&

'0)/

4#!-

'0)/

6## 2&

'0)/

#+?3%,

'0)/

'.$.6#/

'0)/

,&REF

'0)/

,&

'0)/

6###6#/

'.$. 6

4#!-

6$$$ 6

0).$DEC

) # 3#,

0).$IN

) # 3$!

'.,$.!

,.!IN

,.!DEC

,.!OUT

,.!IN

,.!OUT

,.!DEC

!--)8IN

!--)8IN

'.$SLINK

6DIG

6##REG 6

6REG 6

6REG 6

234.

2$3INT

'!0'03

Table 2.

Pin description

Pin

Pin name

I/O

Function

Description

Equivalent circuit

1

FMPINDRV

Out

FM PIN diode driver output

'!0'03

2

FMPINDdec

In

Integrated FM PINdiode

FM

decoupling

'!0'03

3

FMMIXdec

-

FM RF signal ground

4

FMMIXin2

In

FM mixer input 2

5

FMMIXin1

In

FM mixer input 1

'!0'03

6

GNDRF

-

-

RF power ground

-

4/16	Doc ID 022898 Rev 2

TDA7706

Block diagram and pin description

Table 2.

Pin description (continued)

Pin

Pin name

I/O

Function

Description

Equivalent circuit

7

TCAM

-

-

AM AGC time constant

'!0'03

8

VCCRF

In

-

RF 5V supply

-

9

CK_SEL

In

-

Master/Slave clock operation

select

'!0'03

10

GNDVCO

-

VCO ground

-

11

LFref

-

Loop filter reference

-

12

LF1

-

Loop filter output

-

13

VCCVCO

In

VCO

VCO 5V supply

-

14

TCAM2

-

AM AGC 2nd order time constant

'!0'03

15

PINDdec

-

AM AGC internal PIN diode

decoupling

AM pin diode

'!0'03

16

PINDin

-

AM AGC internal PIN diode input

'!0'03

17

GNDLNA

-

AM LNA ground

-

18

LNAin

In

AM LNA input

'!0'03

AM LNA

19

LNAdec

-

AM LNA decoupling

'!0'03

20

LNAout

Out

AM LNA output

-

21

LNAin2

-

AM LNA input 2nd stage

-

Doc ID 022898 Rev 2

5/16