1. Measured per US standard methods and procedures (using selective level meter).
NEC's MC-7847-KC is a GaAs Multi-Chip Modules designed
for use as output stages in CATV applications up to 870 MH
This is a high gain device offering 25 dB minimum gain at
870 MHz. Because this unit is a GaAs device it has low dis-
tortion, low noise figure, and low return loss across the entire
frequency band.
The MC-7847-KC is similar to NEC's standard push-pull
devices, but the higher current allows for better distortion
performance, especially X-mod.
Like the previous generation of products, these devices sur-
vive such hazards as surge and ESD as well as their silicon
competitors, but deliver superior performance with low DC
current required. All devices are assembled and tested using
fully automated equipment to maximize consistency in part to
part performance, and reliability is assured by NEC's stringent
quality and process control procedures. These parts come in
industry compatible hybrid packages.
DESCRIPTION
FEATURES
• GaAs ACTIVE DEVICES
• LOW DISTORTION
• HIGH LINEAR GAIN:
• LOW RETURN LOSS
• LOW GAIN CHANGE OVER TEMPERATURE
• SPECIFIED FOR 79, 110, and 132 CHANNELS
• HIGH RELIABILITY AND RUGGEDNESS:
Date Published January 2007
ELECTRICAL CHARACTERISTICS
SYMBOLS
MC-7847-KC - GL = 25 dB MIN at f = 870 MHz
PERFORMANCE
Withstands environmental extremes as well as Silicon
devices (Surge, ESD, Etc.)
XMod
CSO
RL
CTB
BW
RLi
I
NF
G
Gf
DD
S
L
O
Frequency Range
Linear Gain
Gain Slope
Gain Flatness
Noise Figure 1
Noise Figure 2
Input Return Loss
Output Return Loss
Operating Current
Composite Triple Beat
Cross Modulation
Composite Second Order
25 dB POWER DOUBLER AMPLIFIER
CHARACTERISTICS
PART NUMBER
1
NEC's 870 MHz GaAs CATV
(T
A
= 30±5 °C, V
UNITS
z
MHz
dBc
dBc
dBc
mA
mA
dB
dB
dB
dB
dB
.
DD
= 24 V, Z
25.0
20.0
20.0
19.5
17.0
20.0
MIN
350
1.0
50
OUTLINE DIMENSIONS
APPLICATIONS
• CATV HEADEND SYSTEMS
• CATV OPTICAL NODES
• CATV DISTRIBUTION AMPS
–
–
–
–
–
–
14.85 MAX
MC-7847-KC
4.19±0.13
3.2 MAX
S
8.1 MAX
TYP
= Z
1.4
–
–
–
–
–
–
–
–
–
–
–
–
–
–
L
MC-7847-KC
A
= 75 Ω)
0.38.. A
19.05±0.38
2.54±0.25
1 2 3 5
MAX
26.0
870
420
1.8
0.6
5.5
6.0
-60
-55
-63
–
–
–
–
–
27.5 MAX
PACKAGE OUTLINE H02
45.08 MAX
38.1±0.25
25.4±0.25
7 8 9
0.51±0.05
f = 870 MHz
f = 40 to 870 MHz
40 to 870 MHz; Peak to Valley
f = 50 MHz
f = 870 MHz
40 to 160MHz
160 to 320 MHz
320 to 640 MHz
640 to 870 MHz
40 to 160MHz
RF OFF
110 Channels
V
tilted across the band
OUT
= 50 dBmV at 745.25 MHz, 10 dB
21.5 MAX
6-32 unc 2B
TEST CONDITIONS
4.0±0.25
4.25
6.3
(Units in mm)
±0.05
2.5
+ 0.25
- 0.35
In
0.51±0.05
1
2.54 ±0.38
2 3 7 8
V
DD
5
Gnd
Out
9