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VHF/UHF Prescaler. NTE851 Datasheet

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VHF/UHF Prescaler. NTE851 Datasheet
















NTE851 Prescaler. Datasheet pdf. Equivalent













Part

NTE851

Description

Integrated Circuit VHF/UHF Prescaler



Feature


NTE851 Integrated Circuit VHF/UHF Presca ler Description: The NTE851 is an integ rated circuit prescaler in a 14–Lead DIP type package intended for use in TV frequency synthesis tuning systems ove r an input frequency range of 90 to 100 0MHz. It performs division by 256 in he UHF mode and division by 64 in the VHF mode. The mode of operation can be sel ected by means of th.
Manufacture

NTE Electronics

Datasheet
Download NTE851 Datasheet


NTE Electronics NTE851

NTE851; e bandswitch and the separate UHF and VH F input pins provided. The output is a complementary emitter–coupled stage w ith controlled slew rate for harmonic s uppression. All input pins should be AC coupled to the appropriate input signa l source. Because of high sensitivity, unbuffered coupling from the local osci llator is possible in most cases. In th e UHF mode, which is.


NTE Electronics NTE851

activated by applying a high level to t he bandswitch input pin, all eight divi der stages are operative, resulting in division by 256. In the VHF mode, activ ated by a low level at the VHF input pi n, two divider stages are bypassed, res ulting in division by 64. As a result, approximately the same range of output frequencies are generated fo both the U HF and VHF TV band.


NTE Electronics NTE851

s. An internal amplifier/multiplexer pro vides this control while isolating both inputs and amplifying the VHF signal. In addition, hrmonic output is reduced above 40MHz by limiting output signal r ise and fall times and maintaining a ba lanced load. Features: D Broadband Oper ation: 90 to 1000MHz D High Sensitivity D Standard 5V Power Supply D Dual Mode Operation: VHF/UH.





Part

NTE851

Description

Integrated Circuit VHF/UHF Prescaler



Feature


NTE851 Integrated Circuit VHF/UHF Presca ler Description: The NTE851 is an integ rated circuit prescaler in a 14–Lead DIP type package intended for use in TV frequency synthesis tuning systems ove r an input frequency range of 90 to 100 0MHz. It performs division by 256 in he UHF mode and division by 64 in the VHF mode. The mode of operation can be sel ected by means of th.
Manufacture

NTE Electronics

Datasheet
Download NTE851 Datasheet




 NTE851
NTE851
Integrated Circuit
VHF/UHF Prescaler
Description:
The NTE851 is an integrated circuit prescaler in a 14–Lead DIP type package intended for use in TV
frequency synthesis tuning systems over an input frequency range of 90 to 1000MHz. It performs
division by 256 in he UHF mode and division by 64 in the VHF mode.
The mode of operation can be selected by means of the bandswitch and the separate UHF and VHF
input pins provided. The output is a complementary emitter–coupled stage with controlled slew rate
for harmonic suppression.
All input pins should be AC coupled to the appropriate input signal source. Because of high sensitivity,
unbuffered coupling from the local oscillator is possible in most cases. In the UHF mode, which is
activated by applying a high level to the bandswitch input pin, all eight divider stages are operative,
resulting in division by 256. In the VHF mode, activated by a low level at the VHF input pin, two divider
stages are bypassed, resulting in division by 64. As a result, approximately the same range of output
frequencies are generated fo both the UHF and VHF TV bands. An internal amplifier/multiplexer pro-
vides this control while isolating both inputs and amplifying the VHF signal. In addition, hrmonic output
is reduced above 40MHz by limiting output signal rise and fall times and maintaining a balanced load.
Features:
D Broadband Operation: 90 to 1000MHz
D High Sensitivity
D Standard 5V Power Supply
D Dual Mode Operation: VHF/UHF
D Complementary ECL Outputs
D Independent VHF & UHF Input Pins
Absolute Maximum Ratings:
DC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V
DC bandswitch Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
RMS Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mV
Device Dissipation (TA +70°C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600mW
Derate Linearly Above 70°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5mW/°C
Operating Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C
Lead Temperature (During Soldering, 1/16” from case, 10sec max) . . . . . . . . . . . . . . . . . . . . +265°C




 NTE851
Electrical Characteristics: (TA = +25°C, V+ = 5V, V= 0 unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Supply Current
I+ Pin1 and Pin2
30 60 90 mA
UHF Bandswitch Input Voltage
VHF Bandswitch Input Voltage
UHF Bandswitch Input Current
VHF Bandswitch Input Current
UHF Sensitivity Level Input Voltage
VHF Sensitivity Level Input Voltage
Output Voltage
Output Voltage Rise and Fall Time
VBH
VBL
IBH
IBL
VIN(U)
VIN(V)
VO
tr, tf
High Level
2.4
Low Level
VBH = 20V
VBL = 0
fIN = 450 to 950MHz, fOUT = fIN/256
fIN = 90 to 275MHz, fOUT = fIN/64
Pin4 or Pin5
0.65
1.0
70
V
0.8 V
0.5 mA
1 mA
80 mVrms
mVrms
VPP
ns
Pin Connection Diagram
V(+) 1 1
V(+) 2 2
Bandswitch Input 3
Output 4
Output 5
N.C. 6
V() 1 7
14 VHF Input
13 VHF Input
12 N.C.
11 N.C.
10 UHF Output
9 UHF Output
8 V() 2
14 8
17
.785 (19.95)
Max
.200 (5.08)
Max
.300
(7.62)
.100 (2.45)
.600 (15.24)
.099 (2.5) Min








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