TA2022AFNG
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA2022AFNG
1.5V AM/FM IF
+
MPX
TA2022AFNG is the AM / FM IF + MPX system IC, which is
developed for headphone radio in 1.5V use.
This is included many functions and this can be used for digital
tuning system with IF counter.
Features
•
Suitable for combination with digital tuning system
which is included IF counter.
•
Built−in AM / FM IF count output for IF counter of
digital tuning system.
FM: 10.7MHz
AM: 450kHz
•
Adjustable for stop pulse sensitivity (in FM mode)
•
•
•
•
•
•
For adopting ceramic discriminator, it is not necessary to
adjust the FM QUAD detector circuit.
Built−in AM IF output for AM stereo
MPX input for main signal is independent of that for pilot signal.
(MPX input for pilot signal is shared with AM input)
MPX output is high−impedance in power off mode.
Built−in power switch
Low supply current (V
CC
= 1.2V, Ta = 25°C)
FM mode: I
CC2
= 5.5mA (typ.)
AM mode: I
CC3
= 3.7mA (typ.)
Operating supply voltage range (Ta = 25°C)
V
CC (opr)
= 0.95~2.2V
Stereo operating supply voltage range (Ta = 25°C)
V
CC (opr)
= 1.0~2.2V
Weight: 0.14 g (typ.)
•
•
1
2006-04-11
TA2022AFNG
Terminal Explanation
Terminal Voltage: Typical Terminal Voltage at no Signal with The Test Circuit 1
(V
CC
=
1.2V, Ta
=
25°C)
Terminal
No.
Name
Terminal
Voltage (V)
AM
FM
Function
Internal Circuit
1
V
REF
Referential voltage
Bypass terminal for AM RF
and FM IF amplifier
0.9
0.9
2
OSC
AM OSC
1.2
1.2
4
MIX
Output of AM MIX
1.2
1.2
3
FM IF in
Imput of FM IF signal
・Input
impedance
330Ω (typ.)
0.9
0.9
5
V
CC
―
―
1.2
1.2
6
AM IF IN
Imput of AM IF signal
・Input
impedance
3kΩ (typ.)
1.2
1.2
7
QUAD
FM QUAD detector
1.2
1.2
3
2006-04-11
TA2022AFNG
Terminal
No.
Name
Function
Internal Circuit
Terminal
Voltage (V)
AM
FM
8
AGC
・AM
mode
AGC time constant is
determined by external
capacitor.
・FM
mode
The sudden change of stop
pulse sensitivity is held in by
external capacitor.
―
―
9
GND
―
―
0
0
10
IF OUT
Output of IF count signal
In case of IF request mode, IF
count signal for IF counter is
taken from this terminal.
FM: V
IF (FM)
= 80mV
p−p
(typ.)
AM: V
IF (AM)
= 100mV
p−p
(typ.)
―
―
11
IF REQ
IF request switch
V
CC
: Receive mode
Open: IF request mode
FM stop pulse sensitivity can
be changed by connecting
R
SEN
in IF request mode.
R
SEN
should be smaller than
100kΩ
―
―
12
SP OUT
Output of stop pulse
VCO frequency can be
monitored, in case that this
terminal is connected with
GND through a resistor
(R
VCO
≒
100kΩ).
ON
: VCO monitor
OPEN : SP OUT
Stereo indicator terminal
・This
terminal shared with
output of modulated AM IF
signal.
・AM
IF output: 6mV
rms
(R
IF
= 3kΩ, typ.)
・R
IF
should be smaller than
3kΩ. In case that R
IF
> 3kΩ,
internal biasing circuit doesn't
operate normally in AM mode.
―
―
13
ST IND
―
―
4
2006-04-11
TA2022AFNG
Terminal
No.
14
Name
L
OUT
Function
Internal Circuit
Terminal
Voltage (V)
AM
FM
Output of stereo signal
These terminals are high−
impedance in power off
mode.
0.5
0.5
15
R
OUT
16
LPF
1
LPF terminar for phase detector
―
―
17
VCO
VCO
The temperature characteristic
of free running frequency is
+350ppm / °C.
Temperature coefficient: SH
―
1.2
18
LPF
2A
LPF terminal for synchronous
detector
―
―
19
LPF
2B
LPF terminal for synchronous
detector and AM / FM switch
V
CC
: AM mode
OPEN: FM mode
1.2
―
21
PILOT IN
Input of FM stereo pilot signal
and AM signal
0.1
0.1
5
2006-04-11
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