1998 Nov 18 6
Philips Semiconductors Product specification
FM/IF amplifier/demodulator circuit TDA1576TCHARACTERISTICS
VP= 8.5 V; fIF= 10.7 MHz; RS=60Ω; fm=400 Hz with ∆f=±22.5kHz; 50 µs de-emphasis (C8-9 = 6.8 nF);
Tamb =25°C and measurements taken in Fig.1; unless otherwise specified. The demodulator circuit is adjusted at
minimum second harmonic distortion for ViIF = 1 mV and a deviation ∆f=±75 kHz.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
VPsupply voltage (pin 1) 7.5 8.5 15 V
IPsupply current V5=V
9=V
13 = 0 10 16 23 mA
Reference voltage
Vref reference voltage (pin 14) I14 =−1mA −4.9 −V
∆Vref reference voltage dependence on
temperature
−0.3 −%/K
I14 maximum output current short-circuit current 4 6 7.5 mA
R14 output resistor I14< 1.2 mA −60 150 Ω
IF amplifier
ViIF(rms) input sensitivity (RMS value; pin 17) −3dB before limiting 14 22 35 µV
R17-18 input resistance ViIF = 200 mV (RMS) 10 −−kΩ
C
17-18 input capacitance ViIF = 200 mV (RMS) −5−pF
VoIF(p-p) output voltage at pins 3 and 7
(peak-to-peak value) Z3,7 = 10 pF parallel to
1MΩ610 680 750 mV
R3-7 output resistance 200 250 300 Ω
Demodulator
R4-6 input resistance 20 30 40 kΩ
C4-6 input capacitance −1 2.5 pF
R8,9 output resistance 2.9 3.7 4.5 kΩ
V8,9 DC offset voltage on output pins at
V4-6 =0 V
5> 3 V or V3-7 = 0 or
V13 < 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
V14
∆
V14 T∆×
----------------------
V14
∆
I14
∆
------------
V∆ϕ∆
------- V8-9
∆
ϕ∆
--------------
V8-9
ϕ∆ VP3VBE
–()
-----------------------------------------
V8V9
+
2V2
-------------------
V∆T∆
------- V8V9
+
2V2
-------------------
∆
T∆
-----------------------