ta7678 ETC-unknow, ta7678 Datasheet - Page 3

• Manufacturer Part Number: ta7678
• Description: Linear Integrated Circuit
• Manufacturer: ETC-unknow

CONTEK
TA7678
SIF STAGE
Note:
1.
2.
3.
4.
5.
6.
7.
8.
SIF Output Voltage
Input limiting voltage
AM Rejection Ratio
Recovered Output Voltage
Total Harmonic distortion
Maximun Audi Output Voltage
SIF Input Impedance
Audio Output Impedance
V
Pin 12 with high impedance probe will be 0.8Vp-p and measure the input Level.
V
VIF input : f=45.75MHz CW 15mVrms. Measure the DC level of Pin12.
VIF Input : f=45.75MHz APL 100%.87.5% AM Modulation. Pin 14 Open
4.1. Adjust VIF inpt level 50mVp-p and measure the detected output level Vo(p-p)
4.2. Then increase the input level so that the detected output level will be 1.1* Vo(p-p) and measure the input
V
V
6.1. Setting output of SG1 s o that the DC level of Pin12 will be
6.2. Setting output of SG1(45.65MHz so that the AC level of Pin12 will be 0.5Vp-p.
6.3. Decreasing frequency of SG2 until the AC level of Pin 12 will be 0.35vp-p(-3dB of 0.5Vp-p) then read
SG1:45.75MHz, 1kHz 80% AM Modulation 100mVrms. SG2 ,SG3:OFF. Setting VAGC so that the output AC
level of Pin12 will be 2.7Vp-p. Measure CL of Pin12 after setting to 0% AM of SG1.
Measure 2
AGC
AGC
AGC
AGC
=11.5V,VIF Input : 45.5MHz,1kHz,30 AM Modulation. Adjust VIF input Vi level so that the detected output of
=4V. Measure VIF input level vi is same as note 1 DA=20log(Vi /Vi)(dB)
=8V. VIF input : f=45.75MHz+-10MHz variable or sweep 15mVrms measure DC level of Pin12.
=8V. SG1:45.75MHz CW. SG2:45.65~27MHz variable.
PARAMETER
level.
F
SG2
=F, f
nd
(Ta=25 C,Vcc=12V,fo=45.75MHz,unless otherwise specified)
of Pin12 same as note 9.
BW
=45.75-F MHZ
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:[e-mail]
LINEAR INTEGRATED CIRCUIT
CIRCUIT
TEST
3
8
8
8
8
8
7
9
SYMBOL
RIN(SIF)
CIN(SIF)
RO(AF)
Vi(lim)
AMR
VOD
VOM
VSO
THD
Note 15
Note 16
Note 17
Note 18
Note 18
Noet 19
Note 20
TEST CONDITIONS
MIN. TYP. MAX. UNIT
200
200
0.5
4.0
40
10
10
0.75
400
400
1.0
45
20
15
3
600
2.0
30
10
20
mVrms
mVrms
Vrms
Vp-p
dB
kW
kW
pF
%
3