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ICs for FM/AM Tuner
AN7208SA
TV/FM front-end IC for 1.5 V headphone stereo
s Overview
The AN7208SA is a TV/ FM front-end IC developed for use in the headphone stereo. It incorporates two systems of FM and VHF band front-end. A pre-amp. between IF amp. is not necessary by combination with the AN7233SH.
Unit : mm
6.50.3 20 11
s Features
* Built-in two system of FM and VHF band front-end * Pre-amp. between IF amp. is not necessary (combination with the AN7233SH) * Built-in standby /IF gain control/local oscillator buffer circuits
1 10
4.30.3 6.30.3
(0.50)
0.650.10 1.50.2 0.650.10 0.10.1
(0.33)
0.65
0.250.10
Seating plane
0.15 - 0.05
+0.10
Seating plane
s Applications
* 1.5 V headphone stereo (VCC 1.0 V to 2.0 V)
SSOP020-P-0225A
s Block Diagram
20 19 18 17 16 15 14 13 12 11 Power 10
1
FM mix.
FM OSC
OSC buffer
TV OSC
FM RF 1 2
TV RF 3
TV mix. 4
1st IF amp. 5 6
2nd IF amp. 7 8 9
AN7208SA
s Pin Descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 Description FM RF input TV RF input GND 1 N.C. IF out 1 Mode SW IF in IF gain control IF out 2 GND 2 Pin No. 11 12 13 14 15 16 17 18 19 20 VCC2 STDBY TV OSC 1 TV OSC 2 OSC buff. FM OSC 1 FM OSC 2 TV RF FM RF VCC1
ICs for FM/AM Tuner
Description
s Absolute Maximum Ratings
Parameter Supply voltage Supply current Power dissipation Operating ambient temperature Storage temperature
*1 *1
Symbol VCC ICC PD Topr Tstg
Rating 2.5 12 30 -20 to +75 -55 to +125
Unit V mA mW C C
Note) *1 : All items are at Ta = 25C, except for the operating ambient temperature and storage temperature.
s Recommended Operating Range
Parameter Supply voltage Symbol VCC Range 1.0 to 2.0 Unit V
s Electrical Characteristics at VCC = 1.2 V, Ta = 25C
Parameter TV fIN = 221.75 MHz Conversion gain *1 Oscillation voltage S/N
*2
Symbol
Conditions
Min
Typ
Max
Unit
GCONV(TV) fOUT = 10.6 MHz VOSC(TV) S/N(TV) ITOT(TV) VBUF(TV) VCC = 0.95 V VCC = 0.95 V Input level = 60 dB 1 kHz 30% Mod.
30 15 41 39
38 27 44 8.8 62
46 12
dB mV[rms] dB mA mV[rms]
Quiescent current Oscillation buffer output
Note) Tuning is taken the peak point at 10.6 MHz output level ( VIN = 30 dB, non-modulation) *1 : Conversion gain = 20 Log( V (V) / 31.6) V is the output difference at VIN = 30 dB and at VIN = 36 dB *2 : Measurement is done at the detection output of the AN7233 Measure the ratio of output at fDIV = 22.5 kHz to that at fDIV = 0 Hz (modulation freq. 1 kHz)
2
ICs for FM/AM Tuner
s Electrical Characteristics at VCC = 1.2 V, Ta = 25C (continued)
Parameter TV fIN = 221.75 MHz (continued) Burst noise *3 FM fIN = 107.88 MHz Conversion gain *1 Oscillation voltage S/N
*2
AN7208SA
Symbol
Conditions Input level = 60 dB Non-modulation
Min -1.8
Typ
Max
Unit
VNO(TV)
1.8
mV[p-0]
GCONV(FM) fOUT = 10.6 MHz VOSC(FM) S/N(FM) ITOT(FM) VBUF(FM) VNO(FM) VCC = 0.95 V Input level = 60 dB Non-modulation VCC = 0.95 V Input level = 60 dB 1 kHz 30% mod.
30 40 48 66 -1.8
38 63 51 7.7 132
46 10 1.8
dB mV[rms] dB mA mV[rms] mV[p-0]
Quiescent current Oscillation buffer output Burst noise
*3
Note) Tuning is taken the peak point at 10.6 MHz output level ( VIN = 30 dB, non-modulation) *1 : Conversion gain = 20 Log( V (V) / 31.6) V is the output difference at VIN = 30 dB and at VIN = 36 dB *2 : Measurement is done at the detection output of the AN7233 Measure the ratio of output at fDIV = 22.5 kHz to that at fDIV = 0 Hz (modulation freq. 1 kHz) *3 : Measurement is done at the detection output of the AN7233 Measures a peak voltage of the measurement time = within 500 ms (OK to 10 times)
s Terminal Equivalent Circuits
Pin No. 1
19
Equivalent circuit
Description FM RF input
To mix.
Input resistance or pin voltage Approx. VCC - 0.7 V
RF signal input in FM band (Common base type)
1
2
18
TV RF input
To mix.
Approx. VCC - 0.7 V
RF signal input in TV band (Common base type)
2
3
AN7208SA
s Terminal Equivalent Circuits (continued)
Pin No. 3 Equivalent circuit GND 1 GND pin (RF, mix. block) 4 5 N.C. IF out 1 Outputs IF signal of TV/FM Description
ICs for FM/AM Tuner
Input resistance or pin voltage
Approx. 330 Approx. VCC - 0.7 V
5
6
VCC
Mode SW Switch of band switching VCC : TV mode Open/GND : FM mode
6
7
IF in IF amp. block input
Approx. 5 k
7
4
ICs for FM/AM Tuner
s Terminal Equivalent Circuits (continued)
Pin No. 8 Equivalent circuit Description IF gain control
AN7208SA
Input resistance or pin voltage Approx. 700 Approx. 0.7 V
IF amp. block gain can be decreased
8
by inserting a resistance to GND.
9
IF out 2 IF amp. block output
Approx. 330 Approx. VCC - 0.7 V
9
10
GND GND pin (IF, OSC block)
11
VCC2 Power supply pin (IF, OSC block)
12
STDBY Standby switch VCC /open : IC off GND : IC operates
12
5
AN7208SA
s Terminal Equivalent Circuits (continued)
Pin No. 13 Equivalent circuit Description TV OSC 1
ICs for FM/AM Tuner
Input resistance or pin voltage Approx. 10 k Approx. VCC
Connects a local oscillator coil of
13 14
TV band
VCC
14
TV OSC 2 Connects a local oscillator coil of
13 14
Approx. 10 k Approx. VCC
TV band
VCC
15
OSC buff. Oscillator buffer output pin
15
Approx. 150 Approx. VCC - 0.2 V
16
FM OSC 1 Connects a local oscillator coil of
16 17
Approx. 10 k Approx. VCC
FM band
VCC
6
ICs for FM/AM Tuner
s Terminal Equivalent Circuits (continued)
Pin No. 17 Equivalent circuit Description FM OSC 2 Connects a local oscillator coil of
16 17
AN7208SA
Input resistance or pin voltage Approx. 10 k Approx. VCC
VCC
FM band
18
18
TV RF
To mix.
Connects an RF tuning coil of TV band
2
19
19
FM RF
To mix.
Connects an RF tuning coil of FM band
1
20
VCC1 Power supply pin (RF, mix.block)
7
AN7208SA
s Application Circuit Example
VCC1(1.2 V/0.98 V)
0.047 F 0.047 F 0.022 F 15
ICs for FM/AM Tuner
AN7233SH
ET IF req. 14
50
VCC2(1.5 V)
16 AM D
IF out 13 12 11 X1 220 0.01 F 100 F
Out
17 18 5.1 k 15 V 1 F 1 F 0.022 F
AM AF in GND Det. out Quad
19 MPX in 20 21 R-ch. L-ch. Band PLL 1
VCC 10 SD 9 ST. Mute FMIF in 8 7 6 5 4 3 2 S/N Measurement Others CF2 22 F 330 51 k
50
100 F 100 F
10 k 0.1 F 1 k 680 pF 0.1 F 10 k
22 23 24 25 26
VOSC(TV)
1 000 pF 1 000 pF 100 4.7 k 50 2SC3935 3 pF
15 k
PLL 2 AMIF in VCO AM AGC LPF 1 VCC
330 pF
1 F
27 28
LPF 2 AM mix.
1 AM OSC AM in
56 pF
470 k 470 k 0.001 pF
VOSC(FM)
1 000 pF 100 4.7 k 1 000 pF 2SC3935 5 pF L4
D4
470 k 56 pF 470 k 470k L3 470 k 390 pF L2 47 pF 20 pF 470 k D2 10 0.001 F
0.022 pF
1 000 pF
390 pF D3
100 4.7 k
2SC3935 1 000 pF
AN7208SA
11 V 12 13 14 TV OSC 15
CC2
GND 2 10 IF out 9 0.001 F 0.01 F TV FM 56 k CF1
STDBY
IF gain 8 IF in 7 6 5
OSC buff. TV/FM IF out FM OSC TV RF FM RF VCC1
470 k 16 L1 270 pF 0.001 F 20 pF 470 k D1 17 18 19 10 470 k 20
N.C. 4 GND1 TV in FM in 3 2 1
RCRBTC002-D
1 2 3 4 5 6 50
1 000 pF 50 RF SG. 50
0.001 F 33 F 1 k 10 0.001 F
Parts in use L1 LQNIH54NK04 L2 LQNIA17NK04 L3 LQNIHR21J04 L4 LQNIA33NK04 Vari-cap. CF1, CF2 X1
(Murata) (Murata) (Murata) (Murata)
VFTU
RVDSVC203ATX (Sanyo) RLFGFCWN04AL (Murata) RLFDGC01AL (Murata)
8
VBUF

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