SANYO LA7791T

Ordering number : ENA1144
Monolithic Linear IC
LA7791T
For CATV/Cable Modem
Variable Gain Controlled Amplifier
Overview
The LA7791T is variable gain controlled amplifier with upstream driver. It is ideally suited for use with QAM/QSPK
transmitter system.
Functions
• Differential input amplifier
• Attenuator amplifier
• Driver amplifier with differential output
• Power Save function (Power Save control pin)
• Shut Down function (Shut Down control pin)
• Serial bus interface
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum Supply Voltage
Symbol
VCC max
Conditions
Pin 2,19
Ratings
Unit
6.0
V
VCC
V
Maximum Voltages1
Vin max
Pin 8,9,10,12,18
Maximum Voltages2
Vout max
Pin 15,16
8.0
V
Ta<=+75°C
830
mW
Allowable Power Dissipation
Pdmax
Operating Temperature Range
Topr
-20 to +75
°C
Storage Temperature Range
Tstg
-55 to +150
°C
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.
31208 MS B8-8106 No.A1144-1/4
LA7791T
Recommended Operating Conditions at Ta = 25°C
Parameter
Symbol
Recommended Supply Voltage
VCC
Pin 2,19
5.0
V
VCC op
Pin 2,19
4.75 to 5.25
V
Operating Supply Voltage Range
Conditions
Ratings
Unit
Electrical Characteristics at Ta = 25°C, VCC = 5V, Vin = 29dBmV diff., f = 20MHz , Rin = 75Ω, Rout = 75Ω,
unless otherwise noted.
Parameter
Symbol
Pin No.
Ratings
Conditions
min
Quiescent Current 1
ICCO-1
2,15,16,19
0 to 15dB attenuation
Quiescent Current 2
ICCO-2
2,15,16,19
Quiescent Current 3
ICCO-ps
2,15,16,19
Quiescent Current 4
ICCO-swsd
Quiescent Current 5
typ
Unit
max
180
mA
16 to 63dB attenuation
90
mA
Power Save Mode (TXEN:V18=0V)
6.6
mA
2,15,16,19
Software Shut Down Mode (D7=0)
3.4
mA
ICCO-sd
2,15,16,19
Shut Down Mode (SD:V12=0V)
1.2
mA
Zin
5,6
Rfrq
5,6,15,16
Input Characteristics
Input Impedance
1.6
2
2.4
kΩ
Overall Characteristics
Gain Flatness
Vout=60dBmV Diff,
0.5
dB
f=5 to 42MHz, Ref at 20MHz
Gain Flatness
Rfrq
5,6,15,16
Vout=60dBmV Diff,
1.5
2.0
dB
36.2
dB
f=5 to 65MHz, Ref at 20MHz
Gain Control Range
Gcont
5,6,15,16
f=20MHz, Differential output
Maximum Gain
Gmax
5,6,15,16
f=20MHz, Differential output
63
Minimum Gain
Gmin
5,6,15,16
f=20MHz, Differential output
Gain Step
Gstep
5,6,15,16
f=20MHz, Differential output
0.7
1
IM2
IM2
5,6,15,16
40MHz and 40.2MHz
50
65
dBc
IM3
IM3
5,6,15,16
46
62
dBc
31.2
dB
33.7
-29.3
dB
1.3
dB
54dBmV/tone Diff.
40MHz and 40.2MHz
54dBmV/tone Diff.
Output Characteristics
Output Signal Level
Vo
5,6,15,16
Differential output
63
Output Noise Level
Vn
5,6,15,16
Differential output
187
300
nV√Hz
Vtran
5,6,15,16
Differential output
5
100
mV
Switching transients voltage
dBmV
Power Save Characteristics (Low active: Low---Power Save mode)
Power Save Attenuation
Setting Time
Att-ps
5,6,15,16, 18
Tset
15,16,18
Vin=29dBmV, 5 to 70MHz, Vin/Vout
59
TXEN(18pin) on/off
Power Save on Voltage
Vps-on
15,16,18
Low, TXEN off
Power Save off Voltage
Vps-off
15,16,18
High, TXEN on
85
dB
2
us
0.8
V
2.0
VCC
V
0.8
V
2.0
VCC
V
Shut Down Characteristics (Low active: Low---Shut Down mode)
Shut Down on Voltage
Vshut-on
12,15,16
Low, SD(12pin) on
Shut Down off Voltage
Vshut-off
12,15,16
High, SD(12pin) off
No.A1144-2/4
LA7791T
Serial Timing Characteristics
Parameter
Symbol
Pin No.
Ratings
Conditions
min
typ
Unit
max
CE to CL Rise Setup Time
tSENS
8,10
100
CE to CL Rise Hold Time
tSENH
8,10
100
ns
DI to CL Setup Time
tSDAS
9,10
100
ns
DI to CL Hold Time
tSDAH
9,10
100
ns
DI Pulse Width High
tDATAH
9
200
ns
DI Pulse Width Low
tDATAL
9
300
ns
CL Pulse Width High
tSCKH
10
200
ns
CL Pulse Width Low
tSCKL
10
300
ns
A
B
C
D
E F
ns
G
CE
CL
DI
D7
D6
D5
D4
D3
D2
D1
MSB
D0
LSB
A) tSENS
E) tSCKH
B) tSDATAH/tSDATAL
F) tSCKL
C) tSDAS
G) tSENH
D) tSDAH
Package Dimensions
unit : mm (typ)
3279
TOP VIEW
BOTTOM VIEW
6.5
20
0.5
6.4
4.4
11
10
1
0.65
0.15
0.22
Exposed Die-Pad
(1.0)
0.08
SIDE VIEW
1.2max
(0.33)
SANYO : TSSOP20J(225mil)
No.A1144-3/4
LA7791T
Block Diagram and Application Circuit Example
Signal
Output
VCC(5V)
VCC(5V)
TOKO
458PT-1087
4:1 impedance ratio
75Ω
20
19
18
0.1µF
0.1µF
GND2
SD
0.1µF
6800pF
TXEN
17
16
15
14
13
12
11
Shut Down
Control
Drive
Attenuator
Sirial Data
Interface
Input
3
4
5
VCC(5V)
GND1
6
7
8
9
10
CE
DI
CL
1000pF
2
1000pF
1
Signal
Input
Sirial Data
Input
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
export license from the authorities concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise,
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 March, 2008. Specifications and information herein are subject
to change without notice.
PS No.A1144-4/4