UPC2798GR Datasheet, PDF (1/15 Pages) NEC – IF DOWN CONVERTOR IC FOR DIGITAL CATV

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