Rainbow Electronics MAX2114 - Manual

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° 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’s 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).
Applications
Features
♦ Complete Low-Cost Solution for DBS Direct
Downconversion
♦ High Level of Integration Minimizes Component
Count
♦ 1MBaud to 45MBaud Operation
♦ Selectable LO Buffer
♦ +5V Single-Supply Operation
♦ 925MHz to 2175MHz Input Frequency Range
♦ On-Chip Quadrature Generator, Dual-Modulus
Prescaler (/32, /33)
♦ On-Chip Crystal Oscillator Amplifier
♦ PLL Phase Detector with Gain-Controlled Charge
Pump
♦ Input Levels: -25dBm to -68dBm per Carrier
♦ Over 50dB Gain Control Range
♦ Noise Figure = 10.6dB; IIP3 = +10.7dBm
(at 1550MHz)
♦ Automatic Baseband Offset Correction
MAX2114
DBS Direct Downconverter
________________________________________________________________ Maxim Integrated Products 1
19-1814; Rev 0; 11/00
Functional Diagram appears at end of data sheet.
Ordering Information Pin Configuration
44 QFN-EP*
PIN-PACKAGE TEMP. RANGE
0°C to +85°C MAX2114UGH
PART
PLLIN-
PLLIN+
MOD-
MOD+
IOUT+
IOUT-
V CC
QOUT+
QOUT-
RFBAND
FLCLK
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
44 43 42 41 40 39 38 37 36 35 34
33
32
31
30
29
28
27
26
25
24
23
IDC- IDC+
LOBUFSEL
RFOUT
CPG1
V CC
XTLOUT
CPG2
GC1 GC2
INSEL
CP FB GND V
CC
TANK+ VRLO TANK- LODIVSEL V
CC
LOBUF-/PSOUT- LOBUF+/PSOUT+
QFN-EP
MAX2114
TOP VIEW
U.S. DSS Set-Top Receivers
European DVB-Compliant
Systems
Cellular Base Stations
Wireless Local Loop Broadband Systems
LMDS
Professional Receivers
VSAT
Microwave Links
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
*Exposed paddle