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PDF TDA7706 Data sheet ( Hoja de datos )
| Número de pieza | TDA7706 | |
| Descripción | Highly integrated tuner | |
| Fabricantes | STMicroelectronics | |
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TDA7706
Highly integrated tuner for AM/FM car-radio
Data brief production data
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 pre-
selection 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 noise-
blanker
■ 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.
'!0'03
LQFP64
It contains mixers and IF amplifiers for AM, FM
and WX, fully integrated VCO and PLL
synthesizer, IF- processing 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.
Table 1.
Device summary
Order code
TDA7706CB
Package
LQFP64 (10x10x1.4mm)
Packing
Tray
September 2013
Doc ID 022898 Rev 3
This is information on a product in full production. For further information contact your local STMicroelectronics sales
office.
1/16
www.st.com
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1 page  
TDA7706
Table 2. Pin description (continued)
Pin Pin name
I/O Function
Block diagram and pin description
Description
Equivalent circuit
7 TCAM
8 VCCRF
9 CK_SEL
10 GNDVCO
11 LFref
12 LF1
13 VCCVCO
14 TCAM2
--
In -
In -
-
-
-
In
VCO
-
AM AGC time constant
RF 5V supply
Master/Slave clock operation
select
VCO ground
Loop filter reference
Loop filter output
VCO 5V supply
AM AGC 2nd order time constant
15 PINDdec
16 PINDin
17 GNDLNA
18 LNAin
19 LNAdec
20 LNAout
21 LNAin2
-
AM AGC internal PIN diode
decoupling
AM pin diode
- AM AGC internal PIN diode input
- AM LNA ground
In AM LNA input
AM LNA
-
AM LNA decoupling
Out AM LNA output
- AM LNA input 2nd stage
'!0'03
-
'!0'03
-
-
-
-
'!0'03
'!0'03
'!0'03
-
'!0'03
'!0'03
-
-
Doc ID 022898 Rev 3
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5 Page 
TDA7706
Figure 3. Crystal oscillator block diagram
!,#
Function description
#LOCK
BUFFER
P
8)
2BIAS
P
8/
INTERNA L
EXTERNA L
'!0'03
2.11
DSP
The TDA7706 embeds two DSP cores for high computational power and achievable
customization. The first DSP and its hardware accelerators take care of all the tuner digital
signal processing. The main program is fixed in ROM. Control parameters are copied to
RAM and they are accessible and modifiable there, thus allowing a parametric performance
optimization. The first DSP core performs:
● digital down-conversion of IF
● bandwidth selection with variable controlled bandwidth
● FM and AM noise blanking
● FM/AM demodulation with soft-mute, high-cut, weak signal processing and quality
detection
● FM stereo decoding with stereo-blend
● RDS demodulation including error correction and block synchronization with generation
of an RDS interrupt for the main µP
● Autonomous control of RDS-AF tests
● Self-alignment of pre-selection tuning
The second DSP is totally free for custom processing implementation. The second
(customizable DSP) can interact with the main DSP by tapping the signal at the access
points as shown in the Figure 4 below.
Doc ID 022898 Rev 3
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