TDA7427A
AM-FM RADIO FREQUENCY SYNTHESIZER
AND IF COUNTER
ON-CHIP REFERENCE OSCILLATOR AND
PROGRAMMABLE IF COUNTER
VHF INPUT AND PRECOUNTER FOR FRE-
QUENCIES UP TO 290MHz (SUITABLE FOR
DAB APPLICATION)
HF INPUT FOR FREQUENCIES UP TO
64MHz (SHORT WAVE BAND)
IN-LOCK DETECTOR FOR SEARCH/STOP
STATION FUNCTION
STAND-BY MODE FOR LOW POWER CON-
SUMPTION
HIGH CURRENT SOURCE FOR 0.5ms
LOCK-IN TIME
DIGITAL PORT EXTENSION WITH SIX OUT-
PUTS FOR FLEXIBILITY IN APPLICATION
FULLY PROGRAMMABLE BY I
2
C BUS
DESCRIPTION
The TDA7427A is a PLL frequency synthesizer
with an additional IF counting system that per-
forms all the functions needed in a complete PLL
radio tuning system for conventional and high
speed RDS tuners. The device has dedicated out-
puts for IN-LOCK detection and Search/Stop sta-
tion.
September 2002
SWITCH
AM/FM
PRECOUNTER
:32/33
5 BIT PROG.
COUNTER
11-21 BIT PROG COUNTER
SWITCH
SWM/DIR
11 BIT PROG
COUNTER
INLOCK
DETECTOR
PHASE
COMP
REF
OSCILLATOR
CHARGE
PUMP
-
+
SWITCH
LP1/LP2
14 BIT PROG
COUNTER
TIMER
CONTROL
I2C BUS
INTERFACE
TEST
LOGIC
PORT EXTENSION
FM_IN
AM_IN
OSCIN
ADDR
SCL
SDA
IF_AM
IF_FM
DOUT2
DOUT3
DOUT4
DOUT5
DOUT6
VDD2
GNDAN
VREF
LP_OUT
VDD1
LP_FM
LP_AM
D95AU372D
SWITCH
SWM/DIR
16 BIT PROG
COUNTER
VDD1
OSCOUT
SSTOP
GNDDIG
LP_HC
DOUT1/INLOCK
24
25
9
10
20
12
13
27
21
22
14
15
16
18
5
6
7
8
26
4
28
1
3
2
17
HFREF
19
SUPPLY
&
POWER-ON
RESET
SWITCH
AM/FM
SWITCH
OUT
BLOCK DIAGRAM
ORDERING NUMBERS: TDA7427AD (TSSOP28)
TDA7427AD1 (SO28)
TSSOP28
SO28
1/21
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
DD1
Supply Voltage
- 0.3 to + 7
V
V
DD2
Supply Voltage
- 0.3 to + 11
V
P
tot
Total Power Dissipation
300
mW
T
stg
Storage Temperature
- 55 to + 150
o
C
T
amb
Ambient Temperature
-40 to + 85
o
C
THERMAL DATA
Symbol
Parameter
TSSOP28
SO 28
Unit
R
th j-amb
Thermal Resistance Junction-Ambient
160
65
o
C/W
LP_FM
LP_HC
LP_AM
VREF
DOUT3
DOUT5
DOUT4
DOUT6
OSCIN
ADDR
VDD1
GND-DIG
FM_IN
N.C.
AM_IN
GND-AN
VDD2
LPOUT
1
3
2
4
5
6
7
8
9
26
25
24
23
22
20
21
19
27
10
28
OSCOUT
HFREF
D95AU374C
N.C.
SCL
SDA
SSTOP
DOUT1/INLOCK
DOUT2
11
12
13
18
16
17
15
14
IF_AM
IF_FM
PIN CONNECTION
TDA7427A
2/21
PIN DESCRIPTION
PIN
SYMBOL
DESCRIPTION
1
LP_FM
Filter OPAMP input, charge pump output (FM mode)
2
LP_HC
Filter OPAMP input, charge pump output (high current mode)
3
LP_AM
Filter OPAMP input, charge pump output (AM mode)
4
VREF
OPAMP reference voltage
5
DOUT3
Digital Output 3 (open collector)
6
DOUT4
Digital Output 4 (open collector)
7
DOUT5
Digital Output 5 (open collector)
8
DOUT6
Digital Output 6 (open collector)
9
OSCIN
Reference Oscillator Input
10
OSCOUT
Reference Oscillator Output
11
N.C.
Not connected
12
SCL
I
2
C bus clock input
13
SDA
I
2
C bus data I/O
14
IF_AM
IF counter HF input
15
IF_FM
IF counter VHF input
16
SSTOP
IF counter result output
17*
DOUT1
Digital output 1 (push-pull)
17*
INLOCK
Inlock detector output
18
DOUT2
Digital Output 2 (open collector)
19
HF-REF
HF reference pin
20
ADDR
I
2
C bus address pin
21
VDD1
Supply Voltage
22
GND-DIG
Digital ground
23
N.C.
Not connected
24
FM_IN
High frequency input FM
25
AM_IN
High frequency input AM
26
GND-AN
Analog ground
27
VDD2
Supply Voltage
28
LP_OUT
Filter OPAMP output
* Pin function is selectable by software (see software specification)
TDA7427A
3/21
ELECTRICAL CHARACTERISTICS (T
amb
= 25
C; V
DD1
= 5V; V
DD2
= 10V; f
OSC
= 4MHz; unless other-
wise specified).
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
DD1
Supply Voltage
4.5
5.0
5.5
V
V
DD2
Supply Voltage
9.0
11.0
V
I
DD1
Supply Current
no output load
2
4
6
mA
I
DD2
Supply Current
PLL locked
1
2
3
mA
I
DD1 STB
Supply Current
Standby mode
1
A
RF INPUT (AM_IN, FM_IN)
f
iAM
Input Frequency AM
Vi = 100mV
rms
sinusoidal
0.5
64
MHz
f
iFM
Input Frequency FM
Vi = 100mV
rms
sinusoidal
30
200
MHz
V
iMIN
Min Input Voltage AM
0.5 to 16MHz range sinusoidal
30
mVrms
V
iMAX
Max Input Voltage AM
0.6 to 16MHz range sinusoidal
600
mVrms
V
iMIN
Min Input Voltage FM
70 to 120MHz range sinusoidal
30
mVrms
V
iMAX
Max Input Voltage FM
70 to 120MHz range sinusoidal
600
mVrms
Z
in
Input Impedance FM input
3
4
5
K
Z
in
Input Impedance AM input
3
4
5
K
IF COUNTER (IF_AM, IF_FM)
f
iAM
Input Frequency range AM
Vi = 100mV
rms
0.400
11
MHz
f
iAM
Input Frequency range FM
Vi = 100mV
rms
10
11
MHz
V
iMIN
Min Input Voltage AM IF pin
f
in
= 455kHz
30
mVrms
V
iMIN
Min Input Voltage FM IF pin
f
in
= 10.7MHz
30
mVrms
V
iMAX
Max Input Voltage AM IF pin
f
in
= 455kHz
600
mVrms
V
iMAX
Max Input Voltage FM IF pin
f
in
= 10.7MHz
600
mVrms
Z
in
Input Inpedance FM IF pin
3
4
5
K
Z
in
Input Inpedance AM IF pin
3
4
5
K
BUS INTERFACE
T
j
Noise Suppression Time
Constant on SCL, SDA Input
50
ns
f
SCL
SCL Clock Frequency
400
kHz
t
AA
SCL Low to SDA Data Valid
300
ns
t
buf
Time the bus must be free for
the new transmission
4.7
s
t
HD-START
START Condition hold time
4.0
s
t
LOW
Clock Low Period
4.7
s
t
HIGH
Clock High Period
4.0
s
t
SU-SDA
Start Condition Setup Time
4.7
s
t
HD-DATA
Data Input Hold Time
1
s
t
SU-DATA
Data Input Setup Time
250
ns
t
R
SDA & SCL Rise Time
1
s
t
F
SDA & SCL Full Time
0.3
s
t
SU-STOP
Stop Condition Setup Time
4.7
s
t
DH
DATA OUT Time
300
ns
TDA7427A
4/21
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
IL
Input Low Voltage
1
V
V
IH
Input High Voltage
3
V
I
IN
Input Current
-5
+5
A
V
OUT
Output Voltage SDA
acknowledge
I
O
= 1.6mA
0.15
0.4
V
OSCILLATOR
t
bu
Build Up Time
f
out
= 4MHz
100
ms
C
in
Internal Capacitance
20
pF
C
OUT
Internal Capacitance
f
osc
= 4MHz
20
pF
Z
in
Input Impedance
f
osc
= 4MHz
100
K
V
in
Input Voltage (for Slave Mode)
f
IN
= 4 to 13MHz (Sinus)
capacitance coupling
300
V
DD
mV
pp
f
in
Max Input frequency (for Slave
Mode)
V
IN
= 600mV
PP
(Sinus)
30
MHz
LOOP FILTER (LP_FM, LP_AM, LP_HC, LP_OUT)
I
IN
Input Leakage Current (*)
V
IN
= GND; PD
out
= Tristate (1)
-1
0.1
1
A
I
IN
Input Leakage Current (*)
V
IN
= V
DD1
; PD
out
= Tristate (1)
-1
0.1
1
A
V
OL
Output Voltage Low
I
IN
= -0.2mA
0
0.5
V
V
OH
Output Voltage High
I
OUT
= 0.2mA
9.5
10
V
I
OUT
Output Current Sink
10
30
mA
I
OUT
Output Current Source
Vout = 0.5 to 9.5V
10
30
mA
DOUT1/SSTOP (push-pull outputs)
V
OL
Output Voltage Low
I
OUT
= -0.1mA
0.1
0.2
V
V
OH
Output Voltage High
I
OUT
= 0.1mA
V
DD1
*0.2
4.9
V
DOUT2 to 6 (open collector outputs)
I
OUT
Output leakage Current
V
OUT
= 10V
-1
0.1
1
mA
V
OL
Output Voltage Low
I
OUT
= -1mA
0.2
0.5
V
I
OUT
Output Current Sink
Vout = 0.5 to 9.5V
3
5
mA
1) PD = Phase Detector
(*) LP_FM and LP_HC pins only
TDA7427A
5/21
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