NTE875 Просмотр технического описания (PDF) - NTE Electronics
Номер в каталоге
Компоненты Описание
производитель
NTE875 Datasheet PDF : 4 Pages
| |||
DC Electrical Characteristics: (TA = +25°C, VIF = νDET = 0, VPH = 4V, VCOMP = 4V, and all
switches in position 0 (open) unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
12V Supply Current
IF Regulator Voltage
IF Input Voltage
IF Decouple Offset
IF Peaker Voltage (Max Gain)
IF Output Current
IF Peaker Voltage (Min Gain)
Detector Input Voltage
Limiter Tank Voltage
AFC Tank Voltage
VCO Tank Voltage
AGC Sync Threshold
AGC Filter Leakage Current
AGC Filter Charge Current
AGC Filter Discharge Current
RF AGC Leakage Current
RF AGC Output Current
I1 + I2 VAGC = 6.7V, VCOMP = 6V
V5 VAGC = 6.7V, SW4 Position 1
V7, V8 VAGC = 2V, SW2, 3, 4 Position 1
V6 – V9 VAGC = 2V, SW2, 3, 4 Position 1
V3, V4 VAGC = 2V, SW2, 3, 4 Position 1
I1 VAGC = 9V, SW2, 3, 4 Position 1,
Measure V1, I1 = (12 – V1)/50
V3, V4 VAGC = 9V, SW2, 3, 4 Position 1
V28 VAGC = 6.7V, SW1, 4 Position 1
V24, V25 VAGC = 6.7V, SW1, 4 Position 1
V23, V26 VAGC = 6.7V, SW1, 4 Position 1
V19, V20 VAGC = 6.7V, SW1, 4 Position 1
V17 SW1, 2 Position 1, Adjust VCOMP for
I13 = 0
I13 SW1, 2, 4 Position 1
I13 SW1, 2 Position 1, VCOMP = 3.5V
I13 SW1, 2 Position 1, VCOMP = 4.5V
I11 VAGC = 2V, All Switches Position 1,
Measure V11, I11 = (12 – V11)/6000
I11 VAGC = 10V, All Switches Position 1,
Measure V11, I11 = (12 – V11)/6000
35 60 80 mA
5.8 6.4 7.0 V
3.2 3.7 4.1 V
–
0 ±30 mV
2.3 3.0 3.6 V
3.1 5.5 7.8 mA
5.5 6.2 – V
4.3 4.9 5.5 V
6.4 7.0 7.6 V
4.3 4.9 5.5 V
4.7 5.2 5.7 V
3.8 4.0 4.2 V
–
0 ±5 µA
1.6 2.2 2.8 mA
–0.45 –0.70 –0.90 mA
–
0 20 µA
1.5 1.8 – mA
Detector AC Set–Up Procedure: (SW1, 4 position 1, VAGC = 0V)
1. Apply νDET = 10mVrms, 45.75MHz CW at the detector input. Tune L1 for maximum AC signal
at Pin25, measured with a 10x FET probe or through a 1pF capacitor to prevent loading of
the limiter tank.
2. Increase νDET to 60mVrms. Adjust L3 until the PLL locks, as indicated by a DC voltage at
the video output Pin16.
3. With the detector locked, adjust L3 for 4V at Pin18.
4. Adjust VPH for maximum detector efficiency by monitoring Pin16 for a minimum DC voltage.
5. Adjust L2 for 3.0V at Pin27 (on sensitive slope of AFC curve).
AC Electrical Characteristics: (TA = +25°C, Detector set–up as above, f = 45.75MHz,
VAGC = 6.7V, VCOMP = 4V, and allswitches in position 0 (open)
unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
IF Amplifier Gain
νOUT/νIF VAGC = 2V, SW2, 3, 4 Position 1,
νIF = 500µVrms, Note 1
25 35 – dB
VAGC for 15dB Gain Reduction
SW2, 3, 4 Position 1, νIF = 2.8mVrms, 4.2 4.6 5.0 V
Adjust VAGC for Same νOUT as Gain
Test
VAGC for 45dB Gain Reduction
SW2, 3, 4 Position 1, νIF = 89mVrms, 5.1 5.5 6.1 V
Adjust VAGC for Same νOUT as Gain
Test
Share Link: 