MC-7845
MC-7846
MC-7847
NEC's 870 MHz GaAs CATV
POWER DOUBLER AMPLIFIER
FEATURES
OUTLINE DIMENSIONS (Units in mm)
• GaAs ACTIVE DEVICES
• LOW DISTORTION
PACKAGE OUTLINE H02
• HIGH LINEAR GAIN:
45.08 MAX
MC-7845 - GL = 18 dB MIN at f = 870 MHz
MC-7846 - GL = 22 dB MIN at f = 870 MHz
MC-7847 - GL = 25 dB MIN at f = 870 MHz
38.1±0.25
4.25 + 0.25
27.5 MAX
- 0.35
3.2 MAX
V
DD
14.85 MAX
5
• LOW RETURN LOSS
4.0±0.25
8.1 MAX
1
9
• LOW GAIN CHANGE OVER TEMPERATURE
19.05±0.38
In
Out
• SPECIFIED FOR 79, 110, and 132 CHANNELS
PERFORMANCE
6-32 unc 2B
21.5 MAX
25.4±0.25
2.54±0.25
2
3 7 8
Gnd
0.51±0.05
• HIGH RELIABILITY AND RUGGEDNESS:
Withstands environmental extremes as well as Silicon
devices (Surge, ESD, Etc.)
1
2
3
5
7 8 9
10.75 ±0.25
DESCRIPTION
2.54 ±0.38
4.19±0.13
A
NEC's MC-7845, MC-7846, and MC-7847 are GaAs Multi-
Chip Modules designed for use as output stages in CATV ap-
plications up to 870 MHz. The only difference between these
devices is gain, which is 18 dB, 22 dB, and 25 dB respec-
tively. Because these units are GaAs devices they have low
distortion, low noise figure, and low return loss across the entire
frequency band.
6.3
2.5
0.51±0.05
0.38.. A
±0.05
APPLICATIONS
• CATV HEADEND SYSTEMS
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 strin-
gent quality and process control procedures. These parts come
in industry compatible hybrid packages.
• CATV OPTICAL NODES
• CATV DISTRIBUTION AMPS
ELECTRICAL CHARACTERISTICS (TA = 30±5 °C, VDD = 24 V, ZS = ZL = 75 Ω)
PART NUMBER
CHARACTERISTICS
Frequency Range
Linear Gain
MC-7845
MC-7846
MC-7847
SYMBOLS
UNITS MIN TYP MAX MIN TYP MAX MIN TYP MAX TEST CONDITIONS
BW
GL
S
MHz
dB
50
18.0
0.2
–
–
–
870
50
–
–
870
50
–
–
870
19.0 22.0
23.0 25.0
26.0 f = 870 MHz
Gain Slope
dB
0.6 1.0
0.6 1.0
1.4
0.6
1.0
–
1.4
–
1.8
0.6
f = 40 to 870 MHz
Gf
Gain Flatness
dB
–
0.6
–
–
40 to 870 MHz;
Peak to Valley
NF
Noise Figure 1
Noise Figure 2
Input Return Loss
dB
dB
–
–
–
–
–
–
–
–
–
–
–
6.5
7.0
–
–
–
–
–
–
–
–
–
–
–
–
6.0
6.5
–
–
–
–
–
–
–
–
–
–
–
–
5.5
6.0
–
f = 50 MHz
–
–
–
f = 870 MHz
RLi
20.0
19.0
17.5
16.0
20.0
19.0
17.5
16.0
20.0
20.0
19.0
17.0
20.0
20.0
19.0
18.0
20.0
20.0
19.0
17.0
20.0
20.0
19.0
18.0
40 to 160MHz
160 to 320 MHz
320 to 640 MHz
640 to 870 MHz
40 to 160MHz
160 to 320 MHz
320 to 640 MHz
640 to 870 MHz
–
–
–
–
–
–
–
–
–
RLo
Output Return Loss
dB
–
–
–
–
–
–
–
–
–
–
–
–
continued on next page
California Eastern Laboratories