250 MHz QAM IF DOWNCONVERTER
FEATURES
• RF/LO FREQUENCY RANGE: 30-250 MHz
• ON CHIP VCO
• LOW DISTORTION AGC AMPLIFIER:
-9 dBm IIP
3
@ MIN Gain
• ON CHIP VIDEO AMP:
3.0 Vp-p (V
CC
= 5 V)
• SMALL 20 PIN SSOP PACKAGE
• AVAILABLE ON TAPE AND REEL
UPC2798GR
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
(T
A
= 25°C, RF = 45 MHz, L
O
= 55 MHz, P
LO
= -10 dBm, unless otherwise specified)
PART NUMBER
PACKAGE OUTLINE
SYMBOLS
I
CC
CG
MAX1
CG
MAX2
CG
MIN1
CG
MIN2
IIP
3
IIP
3
I
CC
CG
MAX1
CG
MAX2
CG
MIN1
CG
MIN2
IIP
3
PARAMETERS AND CONDITIONS
Circuit Current (no input signal)
Maximum Conversion Gain, V
AGC
= 4.0 V, pins G1A - G1B shorted
Maximum Conversion Gain, V
AGC
= 4.0 V, pins G1A - G1B open
Minimum Conversion Gain, V
AGC
= 1.0 V, pins G1A - G1B shorted
Minimum Conversion Gain, V
AGC
= 1.0 V, pins G1A - G1B open
Input Intercept Point, V
AGC
= 1.0 V, pins G1A - G1B shorted
Input Intercept Point, V
AGC
= 1.0 V, pins G1A - G1B open
Circuit Current (no input signal)
Maximum Conversion Gain, V
AGC
= 4.0 V, pins G1A - G1B shorted
Maximum Conversion Gain, V
AGC
= 4.0 V, pins G1A - G1B open
Minimum Conversion Gain, V
AGC
= 1.0 V, pins G1A - G1B shorted
Minimum Conversion Gain, V
AGC
= 1.0 V, pins G1A - G1B open
Input Intercept Point, V
AGC
= 1.0 V, pins G1A - G1B open
UNITS
mA
dB
dB
dB
dB
dBm
dBm
mA
dB
dB
dB
dB
dBm
mA
MHz
MHz
MHz
dB
dB
dB
dB
V
V
dBm
-9
4.0
1.0
26
15.0
30
30
DC
25
-7
32
9
32.0
72.0
32.0
MIN
24.0
68.0
Total Block (V
CC1
= 5 V, V
CC2
= 5 V, R
L
= 1 kΩ)
35.5
74.0
58.0
39.0
22.0
-14.0
-8.0
47.0
78.5
59.0
43.5
22.5
-7.5
23.0
28.0
250
250
150
60.0
81.0
43.0
45.0
76.0
UPC2798GR
S20
TYP
MAX
Total Block (V
CC1
= 5 V, V
CC2
= 9 V, R
L
= 1 kΩ)
AGC Amplifier and Mixer Block (V
CC1
= 5 V)
I
CC
Circuit Current (no input signal)
f
RF
f
OSC
f
IF
CG
MAX
CG
MIN
GCR
NF
V
AGC (H)
V
AGC (L)
AGC IIP
3
RF Input Frequency Range
OSC Frequency Range
IF Output Frequency Range
Maximum Conversion Gain, V
AGC
= 4.0 V
Minimum Conversion Gain, V
AGC
= 1.0 V
AGC Dynamic Range, V
AGC
= 1.0 to 4.0 V
Noise Figure, SSB, V
AGC
= 4.0 V (MAX Gain)
AGC Voltage High, at MAX Gain
AGC Voltage Low, at MIN Gain
AGC Input Intercept Point, at MIN Gain
California Eastern Laboratories
CEL [ CALIFORNIA EASTERN LABS ]
