DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUIT
µ
PC2798GR
IF DOWN CONVERTOR IC FOR DIGITAL CATV
DESCRIPTION
The
µ
PC2798GR is a Silicon monolithic IC designed for use as QAM IF down convertor for digital CATV. This IC
consists of AGC amplifier, mixer, oscillator, and video amplifier.
The package is 20 pins SSOP suitable for high-density surface mount.
FEATURES
•
•
•
•
•
Low distortion AGC amplifier
On chip IF convertor
On chip video amplifier
Supply voltage: 5 V
Packaged in 20 pins SSOP suitable for high-density surface mount.
IIP
3
=
−9
dBm
fin = 30 to 250 MHz
Vout = 3.0 V
P-P
(differential, @ R
L
= 1kΩ)
ORDERING INFORMATION
PART NUMBER
PACKAGE
20 pins plastic SSOP (225 mil)
PACKAGE STYLE
Embossed tape 12 mm wide. 2.5 k/REEL.
Pin 1 indicates pull-out direction of tape
µ
PC2798GR-E1
*:
For evaluation sample order, please contact your local NEC office.
(Part number for sample order:
µ
PC2798GR)
Please refer to “Quality grade on NEC Semiconductor Devices” (Document number C11531E) published by NEC
Corporation to know the specification of quality grade on the devices and its recommended applications.
Caution electro-static sensitive device
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. P11998EJ3V0DS00 (3rd edition)
Date Published October 1999 N CP(K)
Printed in Japan
The mark
shows major revised points.
©
1996, 1999
µ
PC2798GR
INTERNAL BLOCK DIAGRAM AND PIN CONFIGURATION (Top View)
AGC Amp MIXER
AGC IN1
AGC IN2
V
AGC
V
CC
1
OSC OUT
GND
OSC B2
OSC C1
OSC C2
OSC B1
1
2
3
4
5
6
7
8
9
10
VIDEO
Amp
OSC
OSC OUT
Buffer Amp
20
19
18
17
16
15
14
13
12
11
GND
MIX OUT2
MIX OUT1
G1A
G1B
INA
INB
V
CC
2
OUT1
OUT2
OSC Buffer
Amp
2
Data Sheet P11998EJ3V0DS00
µ
PC2798GR
PIN EXPLANATIONS
Pin Voltage
(V, TYP.)
1.5
Pin No.
1
Symbol
AGC IN1
Explanation
Input pin of IF signal.
1pin is same phase and 2pin is opposite
phase at balance input.
In case of single input, 1pin or 2pin should
be grounded through capacitor.
Equivalent Circuit
4
AGC
control
2
AGC IN2
1.5
Reg
1
2
4
3
AGC
control
3
V
AGC
0 to 5
Automatic gain control pin.
This pin’s bias govern the AGC output level.
Minimum gain at V
AGC
= 0 V
Maximum gain at V
AGC
= 5 V
Recommend to use by deviding AGC voltage
with externally resistor (ex. 100 kΩ).
4
Vcc1
5.0
Power supply pin of IF down convertor block.
Must be connected bypass capacitor to
minimize ground impedance.
Output pin of Oscillator frequency.
Connected to PLL symthesizer IC’s input pin.
4
5
OSC
OUT
4.0
5
Reg
6
GND
0.0
Ground pin.
Must be connected to the system ground
with minimum inductance.
Ground pattern on the board should be
formed as wide as possible.
Internal oscillator consist in balance amplifier.
7 and 8pins, 9 and 10 pins should be
externally connected to oscillate with active
feedback loop.
Connected LC resonator between 7pin and
10pin.
7
OSC B2
2.4
7
8
4
9
10
8
OSC C1
4.6
9
OSC C2
4.6
Reg
Reg
10
OSC B1
2.4
Data Sheet P11998EJ3V0DS00
3
µ
PC2798GR
PIN EXPLANATIONS
Pin Voltage
(V, TYP.)
( ) is
value at
Vcc2 = 9 V.
2.5
(4.7)
Pin No.
Symbol
Explanation
Equivalent Circuit
11
OUT2
Output pin of video amplifier.
In case of R
L
= 1 kΩ, differential output
voltage equal 3 V
P-P
.
OUT1 and INA are same phase.
OUT2 and INB are same phase.
13
12
11
11
OUT1
2.5
(4.7)
REG
13
Vcc2
5 to 9
Power supply pin of video amplifier.
Must be connected bypass capacitor to
minimize ground impedance.
Signal input pin of video amplifier.
This pin is high impedance.
17
15
13
14
16
14
INB
2.5
(4.1)
15
INA
2.5
(4.1)
16
G1B
1.7
(3.3)
Gain control pin of video amplifier.
Maximum gain at G1A-GIB = short.
Minimum gain at G1A-G1B = open.
Gain is able to adjust by inserting arbitrary
resistor between 16pin and 17pin.
REG
17
G1A
1.7
(3.3)
18
MIX
OUT1
3.7
Output pin of mixer.
This output pin features low-impedance
because of its emitter-follower output port.
4
18
19
MIX
OUT2
3.7
19
REG
20
GND
0.0
Ground pin.
Must be connected to the system ground
with minimum inductance.
Ground pattern on the board should be
formed as wide as possible.
4
Data Sheet P11998EJ3V0DS00
µ
PC2798GR
ABSOLUTE MAXIMUM RATINGS (T
A
= 25
°
C unless otherwise specified)
PARAMETER
Supply Voltage 1
Supply Voltage 2
Power Dissipation
Operating Ambient Temperature
Storage Temperature
SYMBOL
Vcc1
Vcc2
P
D
T
A
T
stg
RATING
6.0
6.0
430
−40
to +85
−55
to +150
UNIT
V
V
mW
°C
°C
TEST CONDITIONS
Mixer block
Video Amp block
T
A
= 85
°C
*1
PARAMETER
Supply Voltage 1
Supply Voltage 2
Power Dissipation
Operating Ambient Temperature
Storage Temperature
SYMBOL
Vcc1
Vcc2
P
D
T
A
T
stg
RATING
6.0
11.0
500
−40
to +75
−55
to +150
UNIT
V
V
mW
°C
°C
TEST CONDITIONS
Mixer block
Video Amp block
T
A
= 75
°C
*1
*1.
Mounted on 50
×
50
×
1.6 mm double copper epoxy glass board.
RECOMMENDED OPERATING RANGE
PARAMETER
Supply Voltage 1
Supply Voltage 2
Operating Ambient Temperature 1
Operating Ambient Temperature 2
*2
SYMBOL MIN.
Vcc1
Vcc2
T
A
1
T
A
2
4.5
4.5
−40
−40
TYP.
5.0
5.0
+25
+25
MAX.
5.5
10.0
+85
+75
UNIT
V
V
°C
°C
*3
*2.
@Vcc1 = Vcc2 = 4.5 to 5.5 V
*3.
@Vcc1 = 4.5 to 5.5 V, Vcc2 = 4.5 to 10.0 V
ELECTRICAL CHARACTERISTICS (T
A
= 25
°
C)
PARAMETER
SYMBOL
MIN.
TYP.
MAX.
UNIT
TEST CONDITIONS
Total Block (R
L
= 1 kΩ, by measurement circuit 5)
Circuit Current 1
Maximum Conversion Gain 1
Maximum Conversion Gain 2
Minimum Conversion Gain 1
Minimum Conversion Gain 2
Circuit Current 2
Maximum Conversion Gain 3
Maximum Conversion Gain 4
Minimum Conversion Gain 3
Minimum Conversion Gain 4
Icc1
CG
MAX
1
CG
MAX
2
CG
MIN
1
CG
MIN
2
Icc1
CG
MAX
3
CG
MAX
4
CG
MIN
3
CG
MIN
4
24.0
68.0
32.0
32.0
72.0
35.5
74.0
58.0
39.0
22.0
47.0
78.5
59.0
43.5
22.5
45.0
76.0
43.0
60.0
81.0
mA
dB
dB
dB
dB
mA
dB
dB
dB
dB
no input signal, Vcc1 = Vcc2 = 5 V
V
AGC
= 4.0 V, G1A-G1B pins: short
V
AGC
= 4.0 V, G1A-G1B pins: open
*4
*4
V
AGC
= 1.0 V, G1A-G1B pins: short
V
AGC
= 1.0 V, G1A-G1B pins: open
*4
*4
no input signal, Vcc1 = 5 V, Vcc2 = 9 V
V
AGC
= 4.0 V, G1A-G1B pins: short
V
AGC
= 4.0 V, G1A-G1B pins: open
*4
*4
V
AGC
= 1.0 V, G1A-G1B pins: short
V
AGC
= 1.0 V, G1A-G1B pins: open
*4
*4
Data Sheet P11998EJ3V0DS00
5
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