19-1296; Rev 2; 1/01
ANUAL
N KIT M EET
ATIO
SH
EVALU
S DATA
OLLOW
F
Low-Voltage IF Transceiver with
Limiter/RSSI and Quadrature Modulator
____________________________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
________________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.
MAX2510
_______________Ordering Information
PART
MAX2510EEI
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
28 QSOP
________________________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
___________________Pin Configuration
TOP VIEW
LIMIN 1
CZ 2
CZ 3
RSSI 4
GC 5
LO 6
GND 7
28 VREF
27 MIXOUT
26 GND
25 RXIN
24 TXOUT
MAX2510
23 TXOUT
22 RXIN
21 V
CC
20 GND
19 V
CC
18 Q
17 Q
16 I
15 I
Typical Operating Circuit appears on last page.
V
CC
8
LO 9
GND 10
TXEN 11
RXEN 12
LIMOUT 13
LIMOUT 14
QSOP
________________________________________________________________
Maxim Integrated Products
1
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.
Low-Voltage IF Transceiver with
Limiter/RSSI and Quadrature Modulator
MAX2510
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND .............................................................-0.3V to 8.0V
V
CC
to Any Other V
CC
........................................................±0.3V
I,
I,
Q,
Q
to GND .........................................-0.3V to (V
CC
+ 0.3V)
I to
I,
Q to
Q
Differential Voltage ............................................±2V
RXIN to
RXIN
Differential Voltage ..........................................±2V
LOIN to
LOIN
Differential Voltage..........................................±2V
LIMIN Voltage .............................(VREF - 1.3V) to (VREF + 1.3V)
RXEN, TXEN, GC Voltage...........................-0.3V to (V
CC
+ 0.3V)
RXEN, TXEN, GC Input Current ............................................1mA
RSSI Voltage...............................................-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
QSOP (derate 10mW/°C above +70°C) ........................650mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7V to +5.5V; 0.01µF across CZ and
CZ;
LO,
LO
open; MIXOUT tied to VREF through a 165Ω resistor; GC = 0.5V; RXIN,
RXIN
open; LIMIN tied through 50Ω to VREF; LIMOUT,
LIMOUT
= open; RXEN, TXEN = high; bias voltage at I,
I,
Q,
Q
= 1.4V;
T
A
= -40°C to +85°C; unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Operating Voltage Range
Digital Input Voltage High
Digital Input Voltage Low
Digital Input Current High
Digital Input Current Low
RXEN, TXEN
RXEN, TXEN
RXEN, TXEN = 2.0V
RXEN, TXEN = 0.4V
Receive mode, RXEN = high, TXEN = low
Supply Current
Transmit mode, RXEN = low, TXEN = high
Standby mode, RXEN = high, TXEN = high
Shutdown mode, RXEN = low, TXEN = low
VREF Voltage
GC Input Resistance
(Note 1)
V
CC
/ 2 -
100mV
50
-5
6
0.1
14
17
0.5
0.2
V
CC
/ 2
85
20
25
1
5
V
CC
/ 2 +
100mV
µA
V
kΩ
mA
CONDITIONS
MIN
2.7
2.0
0.4
30
TYP
3.0
MAX
5.5
UNITS
V
V
V
µA
µA
AC ELECTRICAL CHARACTERISTICS
(MAX2510 test fixture; V
CC
= +3.0V; RXEN = TXEN = low; 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
are AC
coupled to 250Ω load; 330pF at RSSI pin; 0.1µF connected from VREF pin to GND; P
RXIN,
RXIN
= -30dBm differentially driven (input
matched); f
RXIN,
RXIN
= 240MHz; bias voltage at I,
I,
Q,
Q
= 1.4V; V
I,Q
= 500mVp-p; f
I,Q
= 200kHz; f
LO,
LO
= 230MHz; P
LO
= -13dBm;
T
A
= +25°C; unless otherwise noted.)
PARAMETER
DOWNCONVERTER
(RXEN = high)
Input Frequency Range
Conversion Gain
Noise Figure
Input 1dB Compression Point
Input Third-Order Intercept
LO to RXIN Isolation
Power-Up Time
2
Standby to RX or TX (Note 5)
(Note 2)
T
A
= +25°C
T
A
= -40°C to +85°C (Note 3)
Single sideband
(Note 4)
Two tones at 240MHz and 240.2MHz,
-30dBm per tone
100
20.5
19.9
11
-18.5
-8
49
5
22.5
600
25
25.5
MHz
dB
dB
dBm
dBm
dBc
µs
CONDITIONS
MIN
TYP
MAX
UNITS
_______________________________________________________________________________________
Low-Voltage IF Transceiver with
Limiter/RSSI and Quadrature Modulator
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2510 test fixture; V
CC
= +3.0V; RXEN = TXEN = low; 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
are AC
coupled to 250Ω load; 330pF at RSSI pin; 0.1µF connected from VREF pin to GND; P
RXIN,
RXIN
= -30dBm differentially driven (input
matched); f
RXIN,
RXIN
= 240MHz; bias voltage at I,
I,
Q,
Q
= 1.4V; V
I,Q
= 500mVp-p; f
I,Q
= 200kHz; f
LO,
LO
= 230MHz; P
LO
= -13dBm;
T
A
= +25°C; unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
MAX2510
LIMITING AMPLIFIER AND RSSI
(RXEN = high, f
LIMIN
= 10MHz, P
LIMIN
= -30dBm from 50Ω source, unless otherwise noted)
Limiter Output Voltage Swing
Phase Variation
Minimum Linear RSSI Range
Minimum Monotonic RSSI Range
RSSI Slope
LIMOUT,
LIMOUT
-75dBm to 5dBm
-75dBm to 5dBm
-85dBm to 5dBm
-75dBm to 5dBm from 50Ω
T
A
= +25°C
T
A
= -40°C to +85°C (Note 3)
At LIMIN input of -75dBm
At LIMIN input of +5dBm
0.25
1.8
±270
±300
±4.5
80
90
20
-86
±0.5
±2.0
±3.0
±350
mV
degrees
dB
dB
mV/dB
dBm
dB
V
V
RSSI Maximum Zero-Scale Intercept (Note 6)
RSSI Relative Error (Notes 6, 7)
Minimum-Scale RSSI Voltage
Maximum-Scale RSSI Voltage
TRANSMITTER
(TXEN = high)
Frequency Range
I,
I,
Q,
Q
Allowable Common-Mode
Voltage Range
(Note 8)
I,
I,
Q,
Q
inputs are 250mVp-p centered
around
this voltage, GC = 2.0V (Note 9)
I, Q are 500mVp-p while
I, Q
are
held
at this DC
voltage (Note 9)
GC = 0.5V
Output Power
GC = open
GC = 2.0V (Note 9)
I,
I,
Q,
Q
1dB Bandwidth
Unwanted Sideband Suppression
LO Rejection
Output IM3 Level
Output IM5 Level
(Note 3)
90° phase difference between I and Q inputs;
GC = 2V
90° phase difference between I and Q inputs;
measured to fundamental tone; GC = 2V
GC = 0.5V (Note 11)
GC = 2V (Note 11)
GC = 2V (Note 11)
T
A
= +25°C
T
A
= -40°C to +85°C
-2.5
-3
70
30
30
100
1.3
1.4
600
V
CC
-
1.2
MHz
V
V
CC
-
1.3
-41
-16
1
80
40
44
-49
-33
-51
dBm
MHz
dBc
dBc
dBc
dBc
Note 1:
This pin is internally terminated to approximately 1.35V through the specified resistance.
Note 2:
Downconverter gain is typically greater than 20dB. Operation outside this frequency range is possible but has not been
characterized.
Note 3:
Guaranteed by design and characterization.
_______________________________________________________________________________________
3
Low-Voltage IF Transceiver with
Limiter/RSSI and Quadrature Modulator
Note 4:
Driving RXIN or
RXIN
with a power level greater than the 1dB compression level forces the input stage out of its linear
range, causing harmonic and intermodulation distortion. The RSSI output increases monotonically with increasing input
levels beyond the mixer’s 1dB compression level. Input 1dB compression point is limited by MIXOUT voltage swing, which
is approximately 2Vp-p into a 165Ω load.
Note 5:
Assuming the supply voltage has been applied, this includes limiter offset-correction settling and Rx or Tx bias stabilization
time. Guaranteed by design and characterization.
Note 6:
The RSSI maximum zero-scale intercept is the maximum (over a statistical sample of parts) input power at which the RSSI
output would be 0V. This point is extrapolated from the linear portion of the RSSI Output Voltage vs. Limiter Input Power
graph in the
Typical Operating Characteristics.
This specification and the RSSI slope define the RSSI function’s ideal
behavior (the slope and intercept of a straight line), while the RSSI relative error specification defines the deviations from
this line. See the
Typical Operating Characteristics
for the RSSI Output Voltage vs. Limiter Input Power graph.
Note 7:
The RSSI relative error is the deviation from the best-fitting straight line of the RSSI output voltage versus the limiter input
power. This number represents the worst-case deviation at any point along this line. A 0dB relative error is exactly on the
ideal RSSI transfer function. The limiter input power range for this test is -75dBm to 5dBm from 50Ω. See the
Typical
Operating Characteristics
for the RSSI Relative Error graph.
Note 8:
Transmit sideband suppression is typically better than 35dB. Operation outside this frequency range is possible but has
not been characterized.
Note 9:
Output IM3 level is typically better than -29dBc.
Note 10:
The output power can be increased by raising GC above 2V. Refer to the Transmitter Output Power vs. GC Voltage and
Frequency graph in the
Typical Operating Characteristics.
Note 11:
Using two tones at 400kHz and 500kHz, 250mVp-p differential per tone at I,
I,
Q,
Q.
MAX2510
__________________________________________Typical Operating Characteristics
(MAX2510 EV kit; V
CC
= +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; P
RXIN,
RXIN
= -30dBm differentially driven (input matched); f
RXIN,
RXIN
= 240MHz; bias voltage at I,
I,
Q,
Q
= 1.4V; V
I,Q
= 500mVp-p; f
I, Q
= 200kHz; f
LO,
LO
= 230MHz; P
LO
= -13dBm; T
A
= +25°C; unless otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE
MAX2510toc01
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
Tx
18
16
SUPPLY CURRENT (mA)
14
12
10
8
6
4
Tx
Rx
MAX2510toc02
TRANSMITTER SUPPLY CURRENT
vs. GC VOLTAGE
30
SUPPLY CURRENT (mA)
25
20
15
10
5
MAX2510toc03
25
20
35
20
SUPPLY CURRENT (mA)
Rx
15
10
5
STANDBY
0
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
2
0
2.5
3.0
3.5
4.0
4.5
STANDBY
0
5.0
5.5
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
GC VOLTAGE (V)
SUPPLY VOLTAGE (V)
4
_______________________________________________________________________________________
Low-Voltage IF Transceiver with
Limiter/RSSI and Quadrature Modulator
MAX2510
____________________________ Typical Operating Characteristics (continued)
(MAX2510 EV kit; V
CC
= +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; P
RXIN,
RXIN
= -30dBm differentially driven (input matched); f
RXIN,
RXIN
= 240MHz; bias voltage at I,
I,
Q,
Q
= 1.4V; V
I,Q
= 500mVp-p; f
I, Q
= 200kHz; f
LO,
LO
= 230MHz; P
LO
= -13dBm; T
A
= +25°C; unless otherwise noted.)
DOWNCONVERTER MIXER CONVERSION
GAIN vs. SUPPLY VOLTAGE
AND TEMPERATURE
MAX2510toc04
MAX2510toc05
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
1.2
SHUTDOWN SUPPLY CURRENT (µA)
1.0
0.8
GAIN (dB)
T
A
= +85°C
0.6
0.4
0.2
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
T
A
= +25°C
19
18
T
A
= -40°C
25
DOWNCONVERTER MIXER CONVERSION
GAIN vs. RXIN FREQUENCY
MAX2510toc06
25
T
A
= -40°C
24
23
22
T
A
= +25°C
21
20
T
A
= +85°C
20
GAIN (dB)
15
10
5
MISMATCH LOSS
COMPENSATED
0
2.5
3.0
3.5
4.0
VOLTAGE (V)
4.5
5.0
5.5
0 100 200 300 400 500 600 700 800 900 1000
RF FREQUENCY (MHz)
RECEIVE MIXER INPUT 1dB
COMPRESSION POINT vs. SUPPLY VOLTAGE
MAX2510toc07
RXIN INPUT IMPEDANCE
vs. FREQUENCY
450
400
REAL IMPEDANCE (Ω)
350
300
250
200
150
100
50
0
REAL
IMAGINARY
SINGLE-ENDED
MAX2510toc08
-12
-13
INPUT 1dB COMPRESSION (dBm)
-14
-15
-16
-17
-18
-19
-20
-21
-22
2.5
3.0
3.5
4.0
4.5
5.0
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
500
5.5
30
90
150 210 270 330 390 450 510
FREQENCY (MHz)
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
5
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