19-1814; Rev 0; 11/00
DBS Direct Downconverter
General Description
The MAX2114 low-cost, direct-conversion tuner is
designed for use in digital direct-broadcast satellite
(DBS) television set-top box units. Its direct-conversion
architecture reduces system cost compared to devices
with IF-based architectures. The MAX2114 directly
tunes L-band signals to baseband using a broadband
I/Q downconverter. The operating frequency range
spans 925MHz to 2175MHz.
The MAX2114 includes a low-noise amplifier (LNA) with
gain control, I and Q downconverting mixers, lowpass
filters with gain and frequency control, a local oscillator
(LO) buffer with a 90掳 quadrature network, and a
charge-pump-based phase-locked loop (PLL) for fre-
quency control. The MAX2114 has an on-chip LO,
requiring only an external varactor-tuned LC tank for
operation. The LO鈥檚 output drives the internal quadra-
ture generator and has a buffer amplifier to drive off-
chip circuitry. The MAX2114 comes in a 44-pin QFN
package with exposed paddle (EP).
Features
o
Complete Low-Cost Solution for DBS Direct
Downconversion
o
High Level of Integration Minimizes Component
Count
o
1MBaud to 45MBaud Operation
o
Selectable LO Buffer
o
+5V Single-Supply Operation
o
925MHz to 2175MHz Input Frequency Range
o
On-Chip Quadrature Generator, Dual-Modulus
Prescaler (/32, /33)
o
On-Chip Crystal Oscillator Amplifier
o
PLL Phase Detector with Gain-Controlled Charge
Pump
o
Input Levels: -25dBm to -68dBm per Carrier
o
Over 50dB Gain Control Range
o
Noise Figure = 10.6dB; IIP3 = +10.7dBm
(at 1550MHz)
o
Automatic Baseband Offset Correction
MAX2114
Applications
U.S. DSS Set-Top Receivers
European DVB-Compliant
Systems
Cellular Base Stations
Wireless Local Loop
Broadband Systems
LMDS
Professional Receivers
VSAT
Microwave Links
Pin Configuration
TOP VIEW
LODIVSEL
V
CC
CP
FB
GND
V
CC
TANK+
VRLO
TANK-
LOBUF-/PSOUT-
LOBUF+/PSOUT+
Ordering Information
PART
MAX2114UGH
*Exposed
paddle
TEMP. RANGE
0掳C to +85掳C
PIN-PACKAGE
44 QFN-EP*
44
43
42
41
40
39
38
37
36
35
34
V
CC
CFLT
XTL-
XTL+
GND
V
CC
RFIN+
RFIN-
GND
QDC-
QDC+
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
33
32
31
30
29
28
27
26
25
24
23
PLLIN-
PLLIN+
MOD-
MOD+
IOUT+
IOUT-
V
CC
QOUT+
QOUT-
RFBAND
FLCLK
MAX2114
Functional Diagram appears at end of data sheet.
IDC-
IDC+
LOBUFSEL
RFOUT
CPG1
V
CC
XTLOUT
CPG2
GC1
GC2
INSEL
QFN-EP
________________________________________________________________
Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim鈥檚 website at www.maxim-ic.com.
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