LA7784 Datasheet PDF - ON Semiconductor

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LA7784
ON Semiconductor

Part Number LA7784
Description Downconverter IC
Page 7 Pages


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Ordering number : ENN8386
LA7784
Monolithic Linear IC
Downconverter IC
for Digital CATV
http://onsemi.com
Overview
The LA7784 is a downconverter IC for digital CATV. It accepts RF input frequencies from 50 to 150MHz and supports
the DOCSIS (USA) and Euro-DOCSIS (Europe) standards.
Features
RF Mixer.
Attenuation control for RF Mixer.
Driver for SAW filter.
IF AGC amplifier.
IF Driver amplifier for ADC.
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Circuit voltages
Circuit current
Allowable power dissipation
Operating temperature range
Storage temperature range
* On the board (114.3×76.1×1.6mm)
Symbol
VCC max
V max
I12, 13
Pd max
Topr
Tstg
Conditions
Pin 8, 14, 19, 20, 21, 22, 26, 27
Pin 9
Pin 12, 13 sink current
Ta70°C
Ratings
6.0
VCC
2
900*
-20 to +70
-55 to +150
Unit
V
V
V
mA
mW
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Operating Conditions at Ta = 25°C
Parameter
Recommended supply voltage
Operating supply voltage range
Symbol
VCC
VCC op
Conditions
Pin 8, 14, 19, 20, 21, 22, 26, 27
Pin 8, 14, 19, 20, 21, 22, 26, 27
Ratings
5.0
4.5 to 5.5
Unit
V
V
Semiconductor Components Industries, LLC, 2013
July, 2013
92706 / O2505 MS OT B8-6337 No.8386-1/7



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AC Characteristics at Ta = 25°C, VCC = 3.3V
LA7784
Parameter
Circuit current
RF input frequency range
RF AGC range
Mixer conversion gain
Mixer inter modulation 1
IF input frequency range
IF amplifier gain
IF inter modulation 2
Range
IF AGC output level
IF output level
Symbol
Itotal
f(RF)
GR1
CG1
IM3 1
f(IF)
G(AGC)
IM3 2
GR2
Vo(IF) 1
Vo(IF) 2
Pin No.
Conditions
8, 14, 19, 20, 21, 22, 26, 27
23, 24
26, 27
26/23, 24
27/23, 24
26/23, 24
27/23, 24
4, 5
12/4, 5
13/4, 5
12/4, 5
13/4, 5
12, 13
12
13
No Signal
fc:-3dB
V9 = 2.5 to 0V
V9 = 2.5V
Input = 75dBμ
V9 = 2.5V
fc:-3dB
V9 = 2.5V
Output = 110dBμ
IF Output Level < ±1dB
Single output
Single output
Package Dimensions
unit: mm
3222A
min
80
50
45
19
Ratings
typ
105
53
22
max
130
150
25
Unit
mA
MHz
dB
dB
40 50
dB
30 100 MHz
51 55 59 dB
40 50
dB
35
1.0
1.0
dB
Vp-p
Vp-p
No. 8386-2/7



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Pin Assignment
NC 1
NC 2
IF AGC AMP GND 3
IF AGC AMP INPUT 4
IF AGC AMP INPUT 5
NC 6
IF AGC AMP GND 7
GND
IF AGC AMP VCC 8
AGC CONTROL 9
NC 10
IF DRIVER AMP GND 11
IF DRIVER AMP OUTPUT 12
IF DRIVER AMP OUTPUT 13
IF DRIVER AMP VCC 14
Block Diagram
LA7784
28 DRIVER GND
27 DRIVER OUTPUT
26 DRIVER OUTPUT
25 RF ATT GND
24 RF ATT INPUT
23 RF ATT INPUT
22 RF ATT VCC
GND
21 LNA VCC
20 DRIVER VCC
19 MIXER/LO VCC
18 NC
17 LO INPUT
16 LO INPUT
15 MIXER/LO GND
No. 8386-3/7



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Pin Description
Pin Number
1
Description
No Connection
2 No Connection
3 AGC Amp GND
4 AGC Amp Input
5
LA7784
Equivalent circuit
(unit: Ω)
6 No Connection
7 AGC Amp GND
8 AGC Amp VCC
9 AGC Control
10 No Connection
11 Post Amp GND
Continued on next page.
No. 8386-4/7



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