SGS Thomson Microelectronics TDA7515 Datasheet
RF-FRONTEND FOR AM/FM-DSP- CARRADIOS
■
RF AGC generation by RF and IF detection
■
I/Q Mixer for FM IF 10.7MHz with image
rejection and programmable IF tank adjust for
FM and AM
■
Preamplifier and mixer for IF 10.7MHz AM
upconversion
■
VCO and programmable divider for “world
receiver”
■
Programmable controlled IF-gain stage
Additional features:
■
High performance fast PLL for RDS-system
■
Electronic alignment for the preselection stages
■
All functions bus-controlled
DESCRIPTION
The frontend is a high performance tuner circuit for
TDA7515
WITH IF SAMPLING
PRODUCT PREVIEW
TQFP44
ORDERING NUMBER: TDA7515
AM/FM - DSP carradios with 10.7MHz - IF sampling.
It contains mixer and IF amplifiers for AM and FM,
VCO and PLL synthesizer on a single chip.
Use of BICMOS technology allows the implementa-
tion of several tuning function s and a minimum of external components.
1 BLOCK DIAGRAM
FM
PM
AM
PM
AGC ADJ
2
I
AGC
2
DIV
1/6
1/10
:1/:2/:3
VCO
1/4
1/8
2
Q
TV1 TV2
PLL
LPOUT LPAM LPFM LPHC
optional
2
Interface
AGC
Bus
Supply
REFDIV
Fref
18/100kHz
2
IF 10.7MHz
DAGC
2
00AT0037
July 2002
This is preliminary information on a new product now in development. Details are subject to change without notice.
1/5
TDA7515
2 PIN CONNECTION
IFAGCTC
VCCIF
IFOUT1
IFOUT2
IFGND
DAGC
Vref
Fref+
Fref-
IFAMAGCTC
SDA
00AT0036
33 32 31 30 29 28 27 26
VCC SCL
IFINAM
GND
IFIN1
IFIN2
MIXOUT1
MIXOUT2
AMAGCTC
FMIFAGCin
AMIN2
AMIN1
34
35
36
37
38
39
40
41
42
43
1 234567
FMPINDR
AMPINDR
AMRFAGCin
AMRFAGCout
FMIN1
RFGND
25 24 23
8910 11
TV1
FMIN2
FMAGCTC
22
21
20
19
18
17
16
15
14
13
1244
TV2
VCCVCO
3 PIN DESCRIPTION
Pin No. Pin Name Function
1 AMRFAGCin AM AGC Input for RF detection
2 AMRFAGCout AM AGC output for RF AGC
3 AMPINDR AM AGC PIN-diode driver
4 FMPINDR FM AGC Pindiode driver
5 FMIN1 FM Mixer Input 1
6 RFGND RF Ground
7 FMIN2 FM Mixer Input 2
8 FMAGCTC FM AGC time constant
9 TV1 Tuning voltage 1 output
10 TV2 Tuning voltage 2 output
11 VCCVCO Supply Voltage VCO
12 GNDVCO VCO Ground
13 VCOB Base VCO
14 VCOE Emitter VCO
15 VPLL PLL Supply Voltage
16 LPAM/SW OP AMP Input to PLL Loop Filter AM / switch output (optional)
17 LPOUT OPAMP output to PLL Loop Filter
18 LPREF Voltage Reference for PLL
19 LPFM OP AMP Input to PLL Loop Filter FM
20 LPHC High Current PLL Loop Filter
GNDPLL
LPHC
LPFM
LPREF
LPOUT
LPAM/SW
VPLL
VCOE
VCOB
GNDVCO
2/5
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