UPC2798GR
250 MHz QAM IF DOWNCONVERTER
FEATURES
DESCRIPTION
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•
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RF/LO FREQUENCY RANGE: 30-250 MHz
ON CHIP VCO
NEC's UPC2798GR is a Silicon MMIC Downconverter manu-
factured with the NESAT™III silicon bipolar process. This
product consists of an input AGC amplifier, mixer, local oscil-
lator, and video amplifier. It is housed in a small 20 pin SSOP
package.ThedeviceisdesignedforuseasanIFdownconverter
for digital CATV settops and cable modems utilizing QAM
modulation.
LOW DISTORTION AGC AMPLIFIER:
-9 dBm IIP3 @ MIN Gain
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•
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ON CHIP VIDEO AMP: 3.0 Vp-p (VCC = 5 V)
SMALL 20 PIN SSOP PACKAGE
NEC's stringent quality assurance and test procedures ensure
the highest reliability and performance.
AVAILABLE ON TAPE AND REEL
ELECTRICAL CHARACTERISTICS (TA = 25°C, RF = 45 MHz, LO = 55 MHz, PLO = -10 dBm, unless otherwise specified)
PART NUMBER
PACKAGE OUTLINE
UPC2798GR
S20
SYMBOLS
PARAMETERS AND CONDITIONS
UNITS
MIN
TYP
MAX
Total Block (VCC1 = 5 V, VCC2 = 5 V, RL = 1 kΩ)
ICC
Circuit Current (no input signal)
mA
dB
24.0
68.0
35.5
74.0
58.0
39.0
22.0
-14.0
-8.0
45.0
76.0
CGMAX1
CGMAX2
CGMIN1
CGMIN2
IIP3
Maximum Conversion Gain, VAGC = 4.0 V, pins G1A - G1B shorted
Maximum Conversion Gain, VAGC = 4.0 V, pins G1A - G1B open
Minimum Conversion Gain, VAGC = 1.0 V, pins G1A - G1B shorted
Minimum Conversion Gain, VAGC = 1.0 V, pins G1A - G1B open
Input Intercept Point, VAGC = 1.0 V, pins G1A - G1B shorted
Input Intercept Point, VAGC = 1.0 V, pins G1A - G1B open
dB
dB
32.0
43.0
dB
dBm
dBm
IIP3
Total Block (VCC1 = 5 V, VCC2 = 9 V, RL = 1 kΩ)
ICC
Circuit Current (no input signal)
mA
dB
32.0
72.0
47.0
78.5
59.0
43.5
22.5
-7.5
60.0
81.0
CGMAX1
CGMAX2
CGMIN1
CGMIN2
IIP3
Maximum Conversion Gain, VAGC = 4.0 V, pins G1A - G1B shorted
Maximum Conversion Gain, VAGC = 4.0 V, pins G1A - G1B open
Minimum Conversion Gain, VAGC = 1.0 V, pins G1A - G1B shorted
Minimum Conversion Gain, VAGC = 1.0 V, pins G1A - G1B open
Input Intercept Point, VAGC = 1.0 V, pins G1A - G1B open
dB
dB
dB
dBm
AGC Amplifier and Mixer Block (VCC1 = 5 V)
ICC
Circuit Current (no input signal)
mA
15.0
23.0
28.0
fRF
fOSC
fIF
RF Input Frequency Range
OSC Frequency Range
MHz
MHz
MHz
dB
30
30
250
250
150
IF Output Frequency Range
Maximum Conversion Gain, VAGC = 4.0 V
DC
CGMAX
25
-7
32
9
CGMIN
GCR
Minimum Conversion Gain, VAGC = 1.0 V
AGC Dynamic Range, VAGC = 1.0 to 4.0 V
Noise Figure, SSB, VAGC = 4.0 V (MAX Gain)
AGC Voltage High, at MAX Gain
dB
dB
dB
V
26
NF
VAGC (H)
VAGC (L)
AGC IIP3
4.0
AGC Voltage Low, at MIN Gain
V
1.0
AGC Input Intercept Point, at MIN Gain
dBm
-9
California Eastern Laboratories