NEC's 870 MHz GaAs CATV MC-7845
MC-7846
POWER DOUBLER AMPLIFIER MC-7847
FEATURES
• GaAs ACTIVE DEVICES
• LOW DISTORTION
• HIGH LINEAR GAIN:
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
•
LOW RETURN LOSS
•
LOW GAIN CHANGE OVER TEMPERATURE
•
SPECIFIED FOR 79, 110, and 132 CHANNELS
PERFORMANCE
•
HIGH RELIABILITY AND RUGGEDNESS:
Withstands environmental extremes as well as Silicon
devices (Surge, ESD, Etc.)
OUTLINE DIMENSIONS
(Units in mm)
PACKAGE OUTLINE H02
45.08 MAX
38.1±0.25
3.2 MAX
27.5 MAX
4.25
+ 0.25
- 0.35
14.85 MAX
4.0±0.25
8.1 MAX
19.05±0.38
1
In
6-32 unc 2B
V
DD
5
9
Out
25.4±0.25
2.54±0.25
2 3 7 8
0.51±0.05
21.5 MAX
12.9 MAX
Gnd
1 2 3 5
7 8 9
2.62±0.35
10.75
±0.25
DESCRIPTION
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 MH
z
. 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.
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.
4.19±0.13
A
0.38.. A
0.51±0.05
2.54
±0.38
6.3
2.5
±0.05
APPLICATIONS
• CATV HEADEND SYSTEMS
• CATV OPTICAL NODES
• CATV DISTRIBUTION AMPS
ELECTRICAL CHARACTERISTICS
(T
A
= 30±5
°C,
V
DD
= 24 V, Z
S
= Z
L
= 75
Ω)
SYMBOLS
BW
G
L
S
Gf
NF
RLi
PART NUMBER
CHARACTERISTICS
Frequency Range
Linear Gain
Gain Slope
Gain Flatness
Noise Figure 1
Noise Figure 2
Input Return Loss
UNITS
MHz
dB
dB
dB
dB
dB
MC-7845
MIN TYP MAX
50
–
870
18.0
–
19.0
0.2
0.6 1.0
–
–
0.6
–
–
20.0
19.0
17.5
16.0
20.0
19.0
17.5
16.0
–
–
–
–
–
–
–
–
–
–
6.5
7.0
–
–
–
–
–
–
–
–
MIN
50
22.0
0.6
–
–
–
20.0
20.0
19.0
17.0
20.0
20.0
19.0
18.0
MC-7846
TYP MAX
–
870
–
23.0
1.0
1.4
–
0.6
–
–
–
–
–
–
–
–
–
–
6.0
6.5
–
–
–
–
–
–
–
–
MC-7847
MIN TYP MAX
50
–
870
25.0
–
26.0
1.0
1.4
1.8
–
–
0.6
–
–
20.0
20.0
19.0
17.0
20.0
20.0
19.0
18.0
–
–
–
–
–
–
–
–
–
–
5.5
6.0
–
–
–
–
–
–
–
–
TEST CONDITIONS
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
160 to 320 MHz
320 to 640 MHz
640 to 870 MHz
continued on next page
RLo
Output Return Loss
dB
California Eastern Laboratories
MC-7845, 7846, 7847
ELECTRICAL CHARACTERISTICS,
cont.
(T
A
= 30±5
°C,
V
DD
= 24 V, Z
S
= Z
L
= 75
Ω)
SYMBOLS
IDD
CTB
XMod
CSO
PART NUMBER
CHARACTERISTICS
Operating Current
Composite Triple Beat
Cross Modulation
1
Composite Second Order
UNITS
mA
dBc
dBc
dBc
MC-7845
MIN TYP MAX
275
–
375
–
-63 -60
–
-59 -55
–
-68 -63
MC-7846
MIN TYP MAX
275
–
375
–
-63
-60
–
-60
-55
–
-67
-63
MC-7847
MIN TYP MAX
275
–
375
–
-65
-60
–
-62
-55
–
-67
-63
TEST CONDITIONS
RF OFF
110 Channels,
V
OUT
= 50 dBmV at
745.25 MHz, 10 dB tilted
across the band
1. Measured per US standard methods and procedures (using selective level meter).
ABSOLUTE
MAXIMUM RATINGS
1
(T
CASE
= 30
°C)
SYMBOLS
V
DD
V
I
T
C
T
STG
PARAMETERS
Supply Voltage
Input Voltage (Single Tone)
2
Operating Case Temperature
Storage Temperature
UNITS
V
dBmV
°C
°C
RATINGS
30
65
-30 to +100
-40 to +100
RECOMMENDED
OPERATING CONDITIONS
(Z
s
= Z
L
= 75Ω)
SYMBOLS
V
DD
V
i
PARAMETERS
Supply VoltageV
Input Voltage
1
, MC-7845
MC-7846
MC-7847
Operating Case
Temperature
UNITS MIN
23.5
dBmV
24.0
–
–
–
-30
TYP MAX
24.5
36.0
32.0
29.0
+25
39.0
35.0
32.0
+85
T
C
°C
Note:
1. Operation in excess of any one of these parameters may result
in permanent damage.
2. Maximum single channel power applied to the input for 1 minute
with no measurable degradation in performance.
Note:
1. Test Conditions: 110 Channels, 10 dB tilted across the band.
ORDERING INFORMATION
PART NUMBER
MC-7845
MC-7846
MC-7847
PACKAGE
7-pin special with heatsink
7-pin special with heatsink
7-pin special with heatsink
QUANTITY
50pcs max/ Tray
50pcs max/ Tray
50pcs max/ Tray
NOTES ON CORRECT USE
1. The space between PC board and root of the lead should be
kept more than 1 mm to prevent undesired stress on the lead and
also should be kept less than 4 mm to prevent undesired parasitic
inductance.
Recommended space is 2.0 to 3.0 mm typical.
2. Recommended torque strength of the screw is 59 to 78 Ncm.
3. Form the ground pattern as wide as possible to minimize ground
impedance. (to prevent undesired oscillation)
All the ground pins must be connected together with wide ground
pattern to decrease impedance difference.
RECOMMENDED SOLDERING CONDITIONS
This product should be soldered in the following recommended
conditions. Other soldering methods and conditions than the
recommended conditions are to be consulted with our sales
representatives.
Soldering
Method
Pin Part Heating
Soldering
Conditions
Pin area temperature: less
than 260°C
1
Hour: Within 2 sec./pin
Condition
Symbol
–
Note.
1. The point of pin part heating must be kept at a distance of more
than 1.2 mm from the root of lead.
Life Support Applications
These NEC products are not intended for use in life support devices, appliances, or systems where the malfunction of these products can reasonably
be expected to result in personal injury. The customers of CEL using or selling these products for use in such applications do so at their own risk and
agree to fully indemnify CEL for all damages resulting from such improper use or sale.
07/08/2003
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