Philips TDA1576T, Datasheet

Page: 6 / 16

1998 Nov 18 6
Philips Semiconductors Product specification
FM/IF amplifier/demodulator circuit TDA1576T
CHARACTERISTICS
V
P
= 8.5 V; f
IF
= 10.7 MHz; R
S
= 60
Ω
; f
m
= 400 Hz with
∆
f =
±
22.5 kHz; 50
µ
s de-emphasis (C
8-9
= 6.8 nF);
T
amb
= 25
°
C and measurements taken in Fig.1; unless otherwise specified. The demodulator circuit is adjusted at
minimum second harmonic distortion for V
iIF
= 1 mV and a deviation
∆
f =
±
75 kHz.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
P
supply voltage (pin 1) 7.5 8.5 15 V
I
P
supply current V
5
= V
9
= V
13
= 0 10 16 23 mA
Reference voltage
V
ref
reference voltage (pin 14) I
14
=
−
1 mA
−
4.9
−
V
∆
V
ref
reference voltage dependence on
temperature
−
0.3
−
%/K
I
14
maximum output current short-circuit current 4 6 7.5 mA
R
14
output resistor
I
14
< 1.2 mA
−
60 150
Ω
IF amplifier
V
iIF(rms)
input sensitivity (RMS value; pin 17)
−
3 dB before limiting 14 22 35
µ
V
R
17-18
input resistance V
iIF
= 200 mV (RMS) 10
− −
k
Ω
C
17-18
input capacitance V
iIF
= 200 mV (RMS)
−
5
−
pF
V
oIF(p-p)
output voltage at pins 3 and 7
(peak-to-peak value) Z
3, 7
= 10 pF parallel to
1 M
Ω
610 680 750 mV
R
3-7
output resistance 200 250 300
Ω
Demodulator
R
4-6
input resistance 20 30 40 k
Ω
C
4-6
input capacitance
−
1 2.5 pF
R
8, 9
output resistance 2.9 3.7 4.5 k
Ω
V
8, 9
DC offset voltage on output pins at
V
4-6
= 0
V
5
> 3 V or V
3-7
= 0 or
V
13
< 0.3 V
−
0
±
100 mV
demodulator efficiency
−
40
−
mV/
°
demodulator efficiency dependent on
supply voltage
−
6.2
−
mV/
°
V/V DC voltage ratio 0.653 0.667 0.680 V/V
dependence on temperature
−
10
−
5
−
1/K
V
14
∆
V
14
T
∆ ×
----------------------
V
14
∆
I
14
∆
------------
V
∆
ϕ ∆
-------
V
8-9
∆
ϕ ∆
--------------
V
8-9
ϕ ∆
V
P
3V
BE
–
( )
-----------------------------------------
V
8
V
9
+
2V
2
-------------------
V
∆
T
∆
-------
V
8
V
9
+
2V
2
-------------------
∆
T
∆
-----------------------