TA2154AFNG
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA2154AFNG
1.5 V 1 Chip Tuner IC (for Digital Tuning System)
TA2154AFNG is developed for 1.5 V headphone stereos. It
incorporates all the functions of an FM/TV front end, AM/FM IF,
and FM multiplex.
The IC can be used for IF count digital tuning systems. Since
the IC divides the buffer output frequency by 16 while
suppressing the FM/TV local oscillation level, the IC can suppress
unnecessary emission, facilitating conformance to the new FCC
specifications (part 15).
Features
•
•
•
FM/TV local oscillator level is low (Built-in auto level control
circuit)
Weight: 0.17 g (typ.)
Suitable for combination with digital tuning system, which is included IF counter.
One terminal type AM/FM IF count output for IF counter of digital tuning system.
•
•
AM: 450 kHz
FM: 10.7 MHz
•
•
One terminal type FM/TV local oscillator.
Local oscillator buffer output terminal shared by AM, FM and TV
•
•
•
AM: 1/1
FM: 1/32
TV: 1/8
•
•
•
For adopting ceramic discriminator, it is not necessary to adjust the FM quad detector circuit.
Built-in FM MPX VCO circuit.
Low supply current (V
CC
= 1.2 V, Ta = 25°C)
I
ccq
(AM) = 5.0 mA (typ.)
I
ccq
(FM) = 13.0 mA (typ.)
I
ccq
(TV) = 13.5 mA (typ.)
•
•
Operating supply voltage: V
CC
= 1.0~2.2 V (Ta = 25°C)
Monaural operating supply voltage: V
CC
= 0.95~2.2 V (Ta = 25°C)
1
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TA2154AFNG
Block Diagram
OSC
OUT
MODE
SW2
MODE
SW1
IF
REQ
IF
OUT
V
T
L OUT
V
CC
FM RF OUT
TV RF OUT
RFV
CC
TV FM OSC
AM RF IN
AM BYPASS
OSC OUT
AM OSC
30
29
28
27
26
25
24
23
MODE2
22
MODE1
21
IF REQ
20
IF COUNT
19
LPF2B
18
LPF2A
17
L OUT
14
R OUT
16
AM
MIX
AM
OSC
1/2
FM
TV
OSC OSC
BUFF
FM/AM/TV
PW SW
SW
1/8 or
1/16
BUFF
BUFF
IF
BUFF
AM
DET
LEVEL
DET
TV
RF
FM
RM
FM
DET
FM/TV
MIX
FM RF IN
RF GND
AM MIX
FM MIX
AGC
FM IF IN
FM
IF
AM
IF
AF
FM MPX
AM IF IN
DET OUT
TV RF IN
MPX IN
QUAD
1
BPF
2
3
4
5
6
7
8
GND
AGC
9
10
11
12
13
MONO
STEREO
LPF1
V
CC
15
R OUT
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TA2154AFNG
Explanation of Terminals
Terminal voltage: Typical terminal voltage at no signal with the test circuit (V
CC
=
1.2 V, Ta
=
25°C)
Pin
No.
Terminal Voltage
AM
FM
TV
Name
Function
Internal Circuit
TV RF OUT
30
1
TV RF IN
Input of TV RF signal
100
Ω
1
RF GND 3
60 pF
0
0
0.1
FM RF OUT
29
2
FM RF IN
Input of FM RF signal
100
Ω
2
RF GND 3
60 pF
0
0.1
0
3
RF-GND
GND (GND for TV/FM stage)
⎯
0
0
0
7 V
CC
TV/FM MIX
⎯
4
3 RF GND
4
FM MIX
Output of TV/FM signal
220
Ω
0.5
0.5
V
CC
7
14 kΩ
5
AM MIX
Output of AM IF signal
14 kΩ
AM MIX
GND 9
3 kΩ
5
0.6
⎯
⎯
IF
6
AGC
AGC
•
AGC time constant is determined
by external capacitor
FM AM
0
0
0
6
7
V
CC
V
CC
(V
CC
for AM, FM IF, MPX stage)
⎯
1.2
1.2
1.2
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TA2154AFNG
Pin
No.
Name
Function
Internal Circuit
Terminal Voltage
AM
FM
TV
V
CC
7
8
FM IF IN
Input of FM IF signal
Input impedance: 330
Ω
(typ.)
8
330
Ω
GND 9
⎯
0.7
0.7
9
GND
GND
(GND for AM, FM IF, MPX stage)
⎯
0
0
0
V
CC
7
3 kΩ
3 kΩ
10
AM IF IN
Input of AM IF signal
Input impedance: 3 kΩ (typ.)
10
1.2
1.2
1.2
GND 9
11
11
QUAD
FM QUAD detector
1.2
1.1
1.1
1 kΩ
7 V
CC
9 GND
7 V
CC
Detector output
Output impedance
AM: 4 kΩ (typ.)
FM: 500
Ω
(typ.)
FM DET.
9
12
DET OUT
34 kΩ 3.5 kΩ 500
Ω
12
AM DET
0.6
0.8
0.8
7 V
CC
13
MPX IN
Input of MPX
13
41 kΩ
5 kΩ
58.5 kΩ
3.4 kΩ
0.1
0.1
0.1
9 GND
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TA2154AFNG
Pin
No.
Name
Function
Internal Circuit
Terminal Voltage
AM
FM
TV
LPF terminal for PLL phase
detection.
14
LPF1
Connecting this terminal to GND
sets the IC to forced Monaural
mode.
⎯
14
⎯
⎯
15
R OUT
V
CC
7
16
L OUT
9
V
CC
7
17
LPF2A
13
100 kΩ 39 kΩ
LPF terminals for synchronous
detector
100 kΩ 39 kΩ
⎯
⎯
⎯
18
LPF2B
GND 9
17
18
10 kΩ
Output of Stereo signal
15/16
0.5
0.5
0.5
⎯
⎯
⎯
2 kΩ
2 kΩ
V
CC
7
100
Ω
19
1.2
1.2
1.2
19
IF COUNT
Output of IF count signal
AM: 450 kHz
FM: 10.7 MHz
GND 9
Request sensitivity
controller
⎯
2.4 kΩ
500
Ω
⎯
⎯
20
IF REQ
IF request switch
20
9 GND
5
2006-04-11
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