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Número de pieza | LA7795T | |
Descripción | AGC Amplifier | |
Fabricantes | Sanyo Semiconductor | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de LA7795T (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
No Preview Available ! Ordering number : ENN8268
LA7795T Monolithic Linear IC
AGC Amplifier with Step Gain Control
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The LA7795T bipolar monolithic IC is an AGC amplifier with driver amplifier for analog-to-digital converters. It is ideally
suited for use with receiver systems that receive QPSK and/or QAM data transmissions.
Functions
• IF AGC control
• IF AGC amplifier
• IF step gain controlled amplifier
• Driver amplifier
Applications
• Digital CATV
• Cable modem receivers
• IP Telephony receivers
Specitications
Absolute Maximum Ratings at Ta = 25 °C
Parameter
Symbol
Conditions
Maximum Supply Voltage
Circuit Voltages
VCC max
V max
Pin 1
Pin 4, Pin 5
Circuit Current
Allowable Power Dissipation
I6
I7
Pd max
Pin 6 sink current
Pin 7 sink current
Ta ≤ 85°C
Operating Temperature
Topr
Storage Temperature
Tstg
*Mounted on PCB (paper phenol 20.0 × 10.0 × 0.8 t mm)
Recommended Operating Conditions at Ta = 25 °C
Parameter
Recommended Supply Voltage
Operating Supply Voltage Range
Symbol
VCC
VCC op
Pin 1
Pin 1
Conditions
Ratings
7.0
VCC op
2
2
190*
-20 to +85
-55 to +150
Unit
V
V
mA
mW
°C
°C
Ratings
5.0
4.5 to 5. 5
Unit
V
V
33005 TN PC No.8268-1/8
1 page LA7795T
Gain - Vagc Characteristic
70
VCC = 5.0 V
60 Frequency = 45 MHz
PIN5:VCC
50 Circuit1
PIN5:GND
40 PIN5:OPEN
30
20
10
0
Noise Figure - Gain Characteristic
40
VCC = 5.0 V
Frequency = 45 MHz
35
Circuit2
30
25
20
15
-10
-20
-30
-40
-0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
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Vagc - V
Gain - Frequency Characteristic
70
VCC = 5.0 V, Vagc = 2.5 V
Circuit2
60
PIN5:VCC
10
5
0
10 15 20 25 30 35 40 45 50 55 60 65 70
Voltage Gain - dB
50 PIN5:GND
40
PIN5:OPEN
30
20
10
0
10 20 30 40 50 60 70 80 90 100
Frequency - MHz
Intermodulation Characteristic
0 VCC = 5.0 V, PIN5 : OPEN
-10 Frequency = 44 MHz, 45 MHz, Circuit4
Vagc
-20 Output
-30
Output
3.0
2.7
2.4
2.1
-40 Vagc 1.8
-50 1.5
-60 1.2
-70
IM3
0.9
-80 0.6
-90 0.3
-100
0
-70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15
Input / Tone - dBm
Intermodulation Characteristic
0 VCC = 5.0 V, PIN5 : VCC
-10 Frequency = 44 MHz, 45 MHz, Circuit4
3.0
2.7
-20
Output
2.4
-30 2.1
-40 1.8
-50
Vagc
-60
-70 IM3
1.5
1.2
0.9
-80 0.6
-90 0.3
-100
0
-70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15
Input / Tone - dBm
Intermodulation Characteristic
0 VCC = 5.0 V, PIN5 : GND
-10 Frequency = 44 MHz, 45 MHz, Circuit4
Vagc
-20 Output
-30
Output
3.0
2.7
2.4
2.1
-40 1.8
-50
Vagc
1.5
-60 1.2
-70 IM3 0.9
-80 0.6
-90 0.3
-100
0
-70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15
Input / Tone - dBm
The vertical axis (Output/Tone) on this graph shows
the values displayed by the spectrum analyzer for
circuit 4.
The actual output power for the corresponding pins
is given by the following formula.
{output power [dBm]}=
{displayed value [dBm]}+10 ⋅ log (250 Ω/50 Ω)
No.8268-5/8
5 Page |
Páginas | Total 8 Páginas | |
PDF Descargar | [ Datasheet LA7795T.PDF ] |
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