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PDF MAX2510 Data sheet ( Hoja de datos )
| Número de pieza | MAX2510 | |
| Descripción | Low-Voltage IF Transceiver with Limiter/RSSI and Quadrature Modulator | |
| Fabricantes | Maxim Integrated | |
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19-1296; Rev 1; 1/98
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
Low-Voltage IF Transceiver with
Limiter/RSSI and Quadrature Modulator
________________General Description
The MAX2510 is a highly integrated IF transceiver for
digital wireless applications. It operates from a +2.7V to
+5.5V supply voltage and features four operating
modes for advanced system power management.
Supply current is reduced to 0.2µA in shutdown mode.
In a typical application, the receiver downconverts a
high IF/RF (up to 600MHz) to a low IF (up to 30MHz)
using a double-balanced mixer. Additional functions
included in the receiver section are an IF buffer that
can drive an off-chip filter, an on-chip limiting amplifier
offering 90dB of received-signal-strength indication
(RSSI), and a robust differential limiter output driver
designed to directly drive a CMOS input. The transmit-
ter section upconverts I and Q baseband signals to an
IF in the 100MHz to 600MHz range using a quadrature
modulator. The transmit output is easily matched to
drive a SAW filter with an adjustable output from 0dBm
to -40dBm and excellent linearity.
The MAX2511 has features similar to the MAX2510, but
upconverts a low IF with an image-reject mixer. The
MAX2511 downconverter also offers image rejection
with a limiter/RSSI stage similar to that of the MAX2510.
________________________Applications
PWT1900, Wireless Handsets, and Base Stations
PACS, PHS, DECT, and Other PCS Wireless
Handsets and Base Stations
400MHz ISM Transceivers
IF Transceivers
Wireless Data Links
Typical Operating Circuit appears on last page.
____________________________Features
o +2.7V to +5.5V Single-Supply Operation
o Complete Receive Path: 600MHz (max) 1st IF to
30MHz (max) 2nd IF
o Unique, Wide-Dynamic-Range Downconverter
Mixer Offers -8dBm IIP3, 11dB NF
o 90dB Dynamic-Range Limiter with High-Accuracy
RSSI Function
o Differential Limiter Output Directly Drives
CMOS Input
o 100MHz to 600MHz Transmit Quadrature
Modulator with 41dB Sideband Suppression
o 40dB Transmit Gain-Control Range; Up to +1dBm
Output Power
o Advanced Power Management (four modes)
o 0.2µA Shutdown Supply Current
_______________Ordering Information
PART
MAX2510EEI
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
28 QSOP
___________________Pin Configuration
TOP VIEW
LIMIN 1
CZ 2
CZ 3
RSSI 4
GC 5
LO 6
GND 7
VCC 8
LO 9
GND 10
TXEN 11
RXEN 12
LIMOUT 13
LIMOUT 14
MAX2510
QSOP
28 VREF
27 MIXOUT
26 GND
25 RXIN
24 TXOUT
23 TXOUT
22 RXIN
21 VCC
20 GND
19 VCC
18 Q
17 Q
16 I
15 I
________________________________________________________________ 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 1-800-835-8769.
1 page  
Low-Voltage IF Transceiver with
Limiter/RSSI and Quadrature Modulator
____________________________ Typical Operating Characteristics (continued)
(MAX2510 EV kit; VCC = +3.0V; 0.01µF across CZ and CZ; MIXOUT tied to VREF through 165Ω resistor; TXOUT and TXOUT loaded
with 100Ω differential; LO terminated with 50Ω; LO AC grounded; GC open; LIMOUT, LIMOUT open; 330pF at RSSI pin; 0.1µF con-
nected from VREF pin to GND; PRXIN, RXIN = -30dBm differentially driven (input matched); fRXIN, RXIN = 240MHz; bias voltage at I, I,
Q, Q = 1.4V; VI,Q = 500mVp-p; f I, Q = 200kHz; fLO, LO = 230MHz; PLO = -13dBm; TA = +25°C; unless otherwise noted.)
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
1.2
1.0
0.8
TA = +85°C
0.6 TA = -40°C
0.4
TA = +25°C
0.2
0
2.5
3.0 3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
5.5
DOWNCONVERTER MIXER CONVERSION
GAIN vs. SUPPLY VOLTAGE
AND TEMPERATURE
25
TA = -40°C
24
23
22 TA = +85°C
TA = +25°C
21
20
19
18
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VOLTAGE (V)
DOWNCONVERTER MIXER CONVERSION
GAIN vs. RXIN FREQUENCY
25
20
15
10
5
MISMATCH LOSS
COMPENSATED
0
0 100 200 300 400 500 600 700 800 900 1000
RF FREQUENCY (MHz)
RECEIVE MIXER INPUT 1dB
COMPRESSION POINT vs. SUPPLY VOLTAGE
-12
-13
-14 TA = +85°C
-15
-16
-17 TA = +25°C
-18
-19 TA = -40°C
-20
-21
-22
2.5
3.0 3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
5.5
500
450
400
350
300
250
200
150
100
50
0
30
RXIN INPUT IMPEDANCE
vs. FREQUENCY
SINGLE-ENDED
IMAGINARY
REAL
90 150 210 270 330 390 450 510
FREQENCY (MHz)
_______________________________________________________________________________________ 5
5 Page 
Low-Voltage IF Transceiver with
Limiter/RSSI and Quadrature Modulator
Table 2. RXIN or RXIN Input Impedance
FREQUENCY
(MHz)
SERIES IMPEDANCE
(Ω)
100 275 - j203
200 149 - j184
300 94 - j143
400 64 - j109
500 53 - j87
Receive IF Filter
The interstage filter, located between the MIXOUT pin
and the LIMIN pin, is typically a three-terminal, 330Ω,
10.7MHz bandpass filter. This filter prevents the limiter
from acting on any undesired signals that are present
at the mixer’s output, such as LO feedthrough, out-of-
band channel leakage, and spurious mixer products.
The filter connections are also set up to feed DC bias
from VREF into LIMIN and MIXOUT through two 330Ω
filter-termination resistors. (See the Typical Operating
Circuit for more information).
Transmit Output Matching
The transmit outputs, TXOUT and TXOUT, are open-
collector outputs and therefore present a high
impedance.
For differential drive, TXOUT and TXOUT are connected
to VCC via chokes, and each side is AC coupled to the
load. A terminating resistor between TXOUT and
TXOUT sets the output impedance. This resistor pro-
vides a stable means of matching to the load.
TXOUT and TXOUT are voltage-swing limited, and
therefore cannot drive the specified maximum power
across more than 150Ω load impedance. This load
impedance typically consists of a shunt-terminating
resistor in parallel with a filter load impedance. To drive
higher output load impedances, the gain must be
reduced (via the GC pin) to avoid saturating the TX out-
put stage.
For single-ended applications, connect the unused TX
output output pin directly to VCC.
400MHz ISM Applications
The MAX2510 can be used as a front-end IC in appli-
cations where the RF carrier frequency is in the
400MHz ISM band. In this case, Maxim recommends
preceding the MAX2510 receiver section with a low-
noise amplifier (LNA) that can operate over the same
supply voltage range. The MAX2630–MAX2633 family
of amplifiers meets this requirement. In many applica-
tions, the MAX2510’s transmit output power is sufficient
to eliminate the need for an external power amplifier.
______________________Layout Issues
A well-designed PC board is an essential part of an RF
circuit. Use the MAX2510 evaluation kit and the recom-
mendations below as guides to generate your own
layout.
Power-Supply Layout
A star topology, which has a heavily decoupled central
VCC node, is the ideal power-supply layout for minimiz-
ing coupling between different sections of the chip. The
VCC traces branch out from this node, each going to
one VCC connection in the MAX2510 typical operating
circuit. At the end of each of these traces is a bypass
capacitor that presents low impedance at the RF fre-
quency of interest. This method provides local decou-
pling at each VCC pin. At high frequencies, any signal
leaking out of a supply pin sees a relatively high imped-
ance (formed by the VCC trace impedance) to the cen-
tral VCC node, and an even higher impedance to any
other supply pin, minimizing Vcc supply-pin coupling.
A single ground plane suffices. Where possible, multi-
ple parallel vias aid in reducing inductance to the
ground plane.
Place the VREF decoupling capacitor (0.1µF typical) as
close to the MAX2510 as possible for best interstage fil-
ter performance. For best results, use a high-quality,
low-ESR capacitor.
Matching/biasing networks around the receive and
transmit pins should be symmetric and as close to the
chip as possible. A cutout in the ground plane under
the matching network components can be used to
reduce parasitic capacitance.
Decouple pins 19 and 21 (VCC) directly to pin 20 (Rx,
Tx ground), which should be directly connected the
ground plane. Similarly, decouple pin 8 directly to pin 7.
Refer to the Pin Description table for more information.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX2510.PDF ] | |
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