Ordering number : ENA1145A
Monolithic Linear IC
LA7796T
For Digital CATV/Cable Modem Receiver
AGC Amplifier
Overview
LA7796T is an AGC amplifier. It is ideally suited for use with Digital CATV, Cable modem receiver and IP Telephony
receiver.
Functions
• IF AGC control
• IF AGC amplifier
• IF Step Gain Controlled Amplifier
• Driver amplifier
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum Supply Voltage
VCC max
Pin 1
7.0
Circuit Voltages
V max
Pin 4 , Pin 5
V
VCC op
V
Circuit Current
I6
Pin 6 sink current
I7
Pin 7 sink current
Allowable Power Dissipation
Pd max
Ta ≤ 85°C
Operating Temperature Range
Topr
-20 to 85
°C
Storage Temperature Range
Tstg
-55 to 150
°C
2
mA
2
mA
220
mW
Specified board: 20.0mm × 10.0mm ¯ 0.8mm, glass epoxy board.
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer' s products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer' s products or
equipment.
91008 MS PC/31208 MS 20070626-S00009 No.A1145-1/8
LA7796T
Recommended Operating Conditions at Ta = 25°C
Parameter
Symbol
Recommended Supply Voltage
Operating Supply Voltage Range
Conditions
Ratings
Unit
VCC
Pin 1
5.0
V
VCC op
Pin 1
4.5 to 5.5
V
Electrical Characteristics at Ta = 25°C, VCC = 5V
Parameter
Symbol
Pin
Conditions
No.
Circuit Current
Itotal
1
No Signal
IF Input Frequency Range
f(in)
2,3
fc : -3dB
Noise Figure
NF
6,7
V4 = 3.0V,
Ratings
Test
circuit
min
Unit
typ
1
25
1
30
max
30
35
mA
100
MHz
Pin5: VCC
2
3
dB
Pin5: GND
2
4
dB
Pin5: OPEN
2
5
dB
f = 45MHz
V4 = 3.0V,
f = 45MHz
V4 = 3.0V,
f = 45MHz
Intermodulation
IM3
6/2,3
V4 = 3.0V,
7/2,3
f1 = 44MHz, f2 = 45MHz,
1
50
6/2,3
V4 = 3.0V,
7/2,3
f = 45MHz
dB
Pin5: VCC
1
45.5
48
50.5
dB
Pin5: GND
1
40.5
43
45.5
dB
Pin5: OPEN
1
37.5
40
42.5
dB
1
40
Output = 104dBμ each
Total Amplifier Gain
G(AGC1)
G(AGC2)
G(AGC3)
AGC Range
GR
IF Output Level
6/2,3
V4 = 3.0V,
7/2,3
f = 45MHz
6/2,3
V4 = 3.0V,
7/2,3
f = 45MHz
6/2,3
IF Output Level < ±1dB
7/2,3
f = 45MHz
dB
VO(IF)1
6,7
Output Level, f = 45MHz
1
AGC Control Max. Voltage
V4H
4
Gain Max.
1
2.5
1.0
3
V
AGC Control Min. Voltage
V4L
4
Gain Min.
1
0
0.5
V
Input Impedance
Zin
2,3
V4 = 0V, f = 45MHz
3
1//6.5
Vp-p
kΩ//pF
Package Dimensions
unit : mm (typ)
3245B
3.0
0.5
3.0
4.9
8
2
0.65
0.125
1.1MAX
(0.85)
0.25
0.08
1
(0.53)
SANYO : MSOP8(150mil)
No.A1145-2/8
LA7796T
Block Diagram
VCC 1
8 GND
7 Driver output1
IF input1 2
6 Driver output2
IF input2 3
AGC
5 Gain control switch
AGC control 4
(Caution) Be sure to connect pin 5 to either VCC or GND or keep it open.
Test Circuit1
1
VCC
8
1000pF
1000pF
TOKO
617DB-1010 B4F
2
7
3
6
200Ω
Spectrum Analyzer
1000pF
Vin
1000pF
Zo=50Ω
1000pF
AGC
5
4
AGC Voltage
200Ω 51Ω
VCC
1000pF
1000pF
SW
Output Voltage is divided by 50Ω / (200+50)Ω
Test Circuit2
1
VCC
Noise Figure
Analyzer: Source
8
1000pF
TOKO
617DB-1010 B4F
2
7
3
6
1000pF
200Ω
1000pF
200Ω 51Ω
1000pF
1000pF
Noise Figure
Analyzer: Sence
AGC
5
4
AGC Voltage
1000pF
VCC
1000pF
VCC
1000pF
SW
Test Circuit3
1
Network Analyzer
8
2
7
3
6
1000pF
200Ω 51Ω
1000pF
200Ω 51Ω
1000pF
51Ω
1000pF
AGC
4
AGC Voltage
1000pF
5
VCC
1000pF
SW
No.A1145-3/8
LA7796T
Pin Function
Pin No.
Function
1
VCC
2
IF input.
3
Equivalent circuit
VCC
Bias
2
3
4
AGC control.
VCC
10kΩ
4
5
Gain control Switch.
VCC
35kΩ
10kΩ
5
35kΩ
6
Driver output.
7
VCC
20Ω
6
20Ω
7
8.0mA
8
8.0mA
GND
No.A1145-4/8
LA7796T
Gain -- Vagc Characteristic
60
VCC = 5.0V
f = 45MHz
Circuit 1
50
Pin5 : VCC
Pin5 : GND
VCC = 5.0V, f = 45MHz
Circuit 2
30
Pin5 : OPEN
20
10
0
20
15
CC
:G
40
N
PE
– 40
ND
:O
35
5
– 30
:V
10
– 20
n5
Pi
– 10
25
n5
Pi
Noise Figure – dB
30
n5
Pi
Voltage Gain – dB
40
Noise Figure -- Gain Characteristic
35
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
Vagc – V
60
15
20
25
30
45
50
55
Voltage Gain – dB
Gain -- Frequency Characteristic
VCC = 5.0V, Vagc = 2.5V
Circuit 1
Pin5 : VCC
50
Voltage Gain – dB
Pin5 : GND
40
Pin5 : OPEN
30
20
10
0
10
20
30
40
50
60
70
80
90
100
Frequency – MHz
– 30
– 10
2.4
– 20
2.1
Va
g
– 40
2.7
1.8
c
– 50
1.5
– 60
1.2
IM3
– 70
0.9
– 80
0.6
– 90
0.3
– 100
0
– 70 – 65 – 60 – 55 – 50 – 45 – 40 – 35 – 30 – 25 – 20 – 15
Output/Tone – dBm
– 20
– 30
VCC = 5.0V, Pin5 : VCC
f = 44MHz, 45MHz, Circuit 1
Vagc
t
tpu
Ou
Output
– 50
1.8
– 60
– 70
2.7
2.1
Vag
c
1.5
1.2
IM3
0.9
– 80
0.6
– 90
0.3
– 100
10
2.1
Va
g
1.8
c
1.5
1.2
– 60
IM3
0.9
– 80
0.6
– 90
0.3
3
2.4
– 40
2.4
– 50
– 70
2.7
Input/Tone – dBm
Intermodulation Characteristic
Vagc – V
0
– 40
Output
3
– 100
0
– 70 – 65 – 60 – 55 – 50 – 45 – 40 – 35 – 30 – 25 – 20 – 15
Input/Tone – dBm
– 10
– 30
Intermodulation Characteristic
VCC = 5.0V, Pin5 : GND
f = 44MHz, 45MHz, Circuit 1
Vagc
t
tpu
Ou
Vagc – V
Output/Tone – dBm
– 20
Output
0
3
Output/Tone – dBm
– 10
Intermodulation Characteristic
VCC = 5.0V, Pin5 : OPEN
f = 44MHz, 45MHz, Circuit 1
Vagc
put
Out
Vagc – V
0
The vertical axis (Output/Tone) on this graph shows
the values displayed by the spectrum analyzer for
circuit 1.
The actual output power for the corresponding pins is
given by the following formula.
{output power [dBm]} =
{displayed value [dBm]} + 10 ⋅ log (250Ω/50Ω)
0
– 65 – 60 – 55 – 50 – 45 – 40 – 35 – 30 – 25 – 20 – 15
Input/Tone – dBm
No.A1145-5/8
LA7796T
Gain -- Vagc Characteristic
50
40
25
°C
20
10
C
0
– 10
30
20
25
°C
Voltage Gain – dB
30
85
°
10
0
– 10
C
– 20
0°
-2
C
– 20
0°
Voltage Gain – dB
40
VCC = 5.0V
Pin5 : GND, f = 45MHz
Circuit 1
C
50
Gain -- Vagc Characteristic
60
VCC = 5.0V
Pin5 : OPEN, f = 45MHz
Circuit 1
85
°
60
– 30
-2
– 30
– 40
– 40
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0.5
0
1.0
1.5
Vagc – V
2.5
3.0
3.5
4.0
Gain -- Vagc Characteristic
60
VCC = 5.0V
Pin5 : VCC, f = 45MHz
Circuit 1
50
40
25
°C
30
20
°C
10
85
0
– 10
0°
C
Voltage Gain – dB
2.0
Vagc – V
-2
– 20
– 30
– 40
0.5
0
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Vagc – V
Noise Figure -- Gain Characteristic
35
30
Noise Figure – dB
Noise Figure – dB
25
°C
20
15
10
0
10
15
20
25
30
35
40
45
50
55
Voltage Gain – dB
Noise Figure – dB
0°
C
25
20
°C
15
10
0
10
15
20
25
30
35
40
45
50
55
Voltage Gain – dB
Noise Figure -- Gain Characteristic
35
25
-2
5
5
30
25
°C
0°
C
VCC = 5.0V
Pin5 : GND, f = 45MHz
Circuit 2
85
-2
Noise Figure -- Gain Characteristic
30
°C
85
25
35
VCC = 5.0V
Pin5 : OPEN, f = 45MHz
Circuit 2
VCC = 5.0V
Pin5 : VCC, f = 45MHz
Circuit 2
85
°C
-2
25
°C
0°
C
20
15
10
5
0
10
15
20
25
30
35
40
45
50
55
Voltage Gain – dB
No.A1145-6/8
LA7796T
Voltage Gain – dB
50
Gain -- Frequency Characteristic
VCC = 5.0V
Pin5 : OPEN
Vagc = 2.5V
Circuit 1
60
50
25°C
-20°C
85°C
40
Voltage Gain – dB
60
30
20
Gain -- Frequency Characteristic
VCC = 5.0V
Pin5 : GND
Vagc = 2.5V
Circuit 1
25°C
-20°C
85°C
40
30
20
10
10
0
10
20
30
40
50
60
70
80
90
0
10
100
20
30
Frequency – MHz
40
50
60
70
80
90
100
Frequency – MHz
Gain -- Frequency Characteristic
60
25°C
-20°C
85°C
Voltage Gain – dB
50
40
30
20
10
VCC = 5.0V
Pin5 : VCC
Vagc = 2.5V
Circuit 1
0
10
20
30
40
50
60
70
80
90
100
Frequency – MHz
– 10
– 20
Output/Tone – dBm
C
°C
25°
-20
– 40
°C
-20
C
5
8 °
– 50
°
25
– 60
C
°C
– 30
85
Output/Tone – dBm
– 20
– 70
IM3
– 80
– 15
Input/Tone – dBm
– 70
IM3
– 100
– 70 – 65 – 60 – 55 – 50 – 45 – 40 – 35 – 30 – 25 – 20 – 15
Input/Tone – dBm
VCC = 5.5V, Pin5 : VCC
f = 44MHz, 45MHz, Circuit 1
°C
-20
C
25°
C
85°
Output
– 40
– 50
°C
25
– 60
– 70
– 80
°C
25
– 60
Intermodulation Characteristic
-20
°C
°C
– 30
– 50
The vertical axis (Output/Tone) on this graph shows
the values displayed by the spectrum analyzer for
circuit 1.
The actual output power for the corresponding pins is
given by the following formula.
85
Output/Tone – dBm
– 20
C
25°
– 90
– 90
0
°C
-20
C
85°
– 40
– 80
– 100
– 70 – 65 – 60 – 55 – 50 – 45 – 40 – 35 – 30 – 25 – 20
– 10
– 30
Output
-20
Output
Intermodulation Characteristic
VCC = 5.0V, Pin5 : GND
f = 44MHz, 45MHz, Circuit 1
°C
0
°C
– 10
Intermodulation Characteristic
VCC = 5.0V, Pin5 : OPEN
f = 44MHz, 45MHz, Circuit 1
85
0
{output power [dBm]} =
{displayed value [dBm]} + 10 ⋅ log (250Ω/50Ω)
IM3
– 90
– 100
– 70 – 65 – 60 – 55 – 50 – 45 – 40 – 35 – 30 – 25 – 20 – 15
Input/Tone – dBm
No.A1145-7/8
LA7796T
SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using
products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd.
products described or contained herein.
SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all
semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or
malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise
to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt
safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not
limited to protective circuits and error prevention circuits for safe design, redundant design, and structural
design.
In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are
controlled under any of applicable local export control laws and regulations, such products may require the
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without the prior written consent of SANYO Semiconductor Co.,Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the
SANYO Semiconductor Co.,Ltd. product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed
for volume production.
Upon using the technical information or products described herein, neither warranty nor license shall be granted
with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third
party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's
intellctual property rights which has resulted from the use of the technical information and products mentioned
above.
This catalog provides information as of September, 2008. Specifications and information herein are subject
to change without notice.
PS No.A1145-8/8