19-1209; Rev 0; 10/97
Lo w -Vo lt a g e IF Tra n s c e ive r
w it h Lim it e r a n d RS S I
MAX251
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
The MAX2511 is a complete, highly integrated IF trans-
ceiver for applications employing a dual-conversion
architecture. Alternatively, the MAX2511 can be used
as a single-conversion transceiver if the RF operating
frequency ranges from 200MHz to 440MHz.
♦ Single +2.7V to +5.5V Supply
♦ Complete Receive Path:
200MHz to 440MHz (first IF) to
8MHz to 13MHz (second IF)
In a typical application, the receiver downconverts a
high IF/RF (200MHz to 440MHz) to a 10.7MHz low IF
us ing a n ima g e -re je c t mixe r. Func tions inc lud e a n
image-reject downconverter with 34dB of image sup-
pression followed by an IF buffer that can drive an off-
chip IF filter; an on-chip limiting amplifier offering 90dB
of monotonic received-signal-strength indication (RSSI);
and a robust limiter output driver. The transmit image-
reject mixer generates a clean output spectrum to mini-
mize filte r re q uire me nts . It is followe d b y a 40d B
variable-gain amplifier that maintains IM3 levels below
-35dBc. Maximum output power is 2dBm. A VCO and
oscillator buffer for driving an external prescaler are
also included.
♦ Limiter with Differential Outputs (adjustable level)
♦ RSSI Function with 90dB Monotonic Dynamic
Range
♦ Complete Transmit Path:
8MHz to 13MHz (second IF) to
200MHz to 440MHz (first IF)
♦ On-Chip Oscillator with Voltage Regulator
and Buffer
♦ Advanced System Power Management
(four modes)
♦ 0.1µA Shutdown Supply Current
The MAX2511 operates from a 2.7V to 5.5V supply and
includes flexible power-management control. Supply
current is reduced to 0.1µA in shutdown mode.
______________Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
PIN-PACKAGE
For applications using in-phase (I) and quadrature (Q)
baseband architecture for the transmitter, Maxim offers
a corresponding transceiver product: the MAX2510.
The MAX2510 ha s fe a ture s s imila r to thos e of the
MAX2511, but upconverts I/Q baseband signals using
a quadrature upconverter.
MAX2511EEI
-40°C to +85°C
28 QSOP
__________________P in Co n fig u ra t io n
TOP VIEW
________________________Ap p lic a t io n s
LIMIN
CZ
1
2
28 VREF
27 MIXOUT
26 GND
PWT1900 Wireless Handsets and
Base Stations
CZ
3
PACS, PHS, DECT and Other PCS
Wireless Handsets and Base Stations
RSSI
GC
4
25 RXIN
24 TXOUT
23 TXOUT
22 RXIN
5
MAX2511
400MHz ISM Transceivers
IF Transceivers
TANK
GND
6
7
Wireless Data Links
21
V
V
CC
8
CC
TANK
GND
9
20 GND
V
CC
19
10
11
V
CC
18 TXEN
17 RXEN
16 TXIN
15 TXIN
OSCOUT 12
LIMOUT 13
LIMOUT 14
Typical Operating Circuit appears at end of data sheet.
QSOP
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
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