19-1209; Rev 0; 10/97
KIT
ATION
EVALU
BLE
AVAILA
Low-Voltage IF Transceiver
with Limiter and RSSI
____________________________Features
o
Single +2.7V to +5.5V Supply
o
Complete Receive Path:
200MHz to 440MHz (first IF) to
8MHz to 13MHz (second IF)
o
Limiter with Differential Outputs (adjustable level)
o
RSSI Function with 90dB Monotonic Dynamic
Range
o
Complete Transmit Path:
8MHz to 13MHz (second IF) to
200MHz to 440MHz (first IF)
o
On-Chip Oscillator with Voltage Regulator
and Buffer
o
Advanced System Power Management
(four modes)
o
0.1µA Shutdown Supply Current
_______________General Description
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.
In a typical application, the receiver downconverts a
high IF/RF (200MHz to 440MHz) to a 10.7MHz low IF
using an image-reject mixer. Functions include an
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 filter requirements. It is followed by a 40dB
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.
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.
For applications using in-phase (I) and quadrature (Q)
baseband architecture for the transmitter, Maxim offers
a corresponding transceiver product: the MAX2510.
The MAX2510 has features similar to those of the
MAX2511, but upconverts I/Q baseband signals using
a quadrature upconverter.
MAX2511
______________Ordering Information
PART
MAX2511EEI
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
28 QSOP
__________________Pin Configuration
TOP VIEW
________________________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
LIMIN
CZ
CZ
RSSI
GC
TANK
GND
V
CC
TANK
1
2
3
4
5
6
7
8
9
28 VREF
27 MIXOUT
26 GND
25
RXIN
TXOUT
TXOUT
MAX2511
24
23
22 RXIN
21 V
CC
20 GND
19
18
17
16
15
V
CC
TXEN
RXEN
TXIN
TXIN
GND 10
V
CC
11
OSCOUT 12
LIMOUT 13
Typical Operating Circuit appears at end of data sheet.
LIMOUT 14
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.
Low-Voltage IF Transceiver
with Limiter and RSSI
MAX2511
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND .............................................................-0.3V to 8.0V
V
CC
to Any Other V
CC
........................................................±0.3V
TXIN,
TXIN
Input Voltage............................-0.3V to (V
CC
+ 0.3V)
TXIN to
TXIN
Differential Voltage ....................................±300mV
RXIN,
RXIN
Input Voltage ........................................-0.3V to 1.6V
TANK,
TANK
Voltage ...............................................-0.3V to 2.0V
LIMIN Voltage .............................(VREF - 1.3V) to (VREF + 1.3V)
LIMOUT,
LIMOUT
Voltage ..............(V
CC
- 1.6V) to (V
CC
+ 0.3V)
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 11mW/°C above 70°C) ...........................909mW
Operating Temperature Range
MAX2511EEI ......................................................-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;
TANK =
TANK;
MIXOUT tied to VREF through a 165Ω resistor; GC open, RXIN =
RXIN;
TXOUT =
TXOUT
= V
CC
; 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
Rx mode, RXEN = high,
TXEN = low
V
CC
= 3.0V
T
A
= +25°C
Tx mode, RXEN = low,
TXEN = high, V
GC
= 0.5V
Standby mode, RXEN = high,
TXEN = high
Shutdown mode, RXEN = low,
TXEN = low
Rx mode, RXEN = high,
TXEN = low
V
CC
= 2.7V to 5.5V,
T
A
= -40°C to +85°C
Tx mode, RXEN = low,
TXEN = high, V
GC
= 0.5V
Standby mode, RXEN = high,
TXEN = high
Shutdown mode, RXEN = low,
TXEN = low
VREF Voltage
LIMOUT,
LIMOUT
Differential Output Impedance
GC Input Resistance
Internally terminated to 1.35V
60
(Note 1)
-5
RXEN, TXEN
RXEN, TXEN
23
-1
24
26
9.5
0.1
38.5
45
14.5
5
V
CC
/ 2 - V
CC
/ 2 V
CC
/ 2 +
100mV
100mV
2
80
125
µA
V
kΩ
kΩ
mA
µA
mA
CONDITIONS
MIN
2.7
2.0
0.4
32
TYP
3.0
MAX
5.5
UNITS
V
V
V
µA
µA
Typical Supply Current
Worst-Case Supply Current
2
_______________________________________________________________________________________
Low-Voltage IF Transceiver
with Limiter and RSSI
MAX2511
AC ELECTRICAL CHARACTERISTICS
(MAX2511 test fixture, V
CC
= +3.0V, RXEN = TXEN = low, 0.01µF across CZ and
CZ,
MIXOUT tied to VREF through 165Ω resistor,
TXIN,
TXIN
tied to VREF through 50Ω resistor, TXOUT and
TXOUT
loaded with 100Ω differential, GC open, LIMOUT,
LIMOUT
loaded
with 2kΩ differential, TANK and
TANK
driven with -2.5dBm from a 100Ω source; OSCOUT AC-terminated with 50Ω, 330pF at RSSI
pin, 0.1µF at VREF pin, Rx inputs and Tx outputs differentially coupled, P
RXIN,
RXIN
= -28dBm (200Ω system), f
RXIN,
RXIN
= 425MHz,
f
LO
= 435.7MHz, f
TXIN,
TXIN
= 10.7MHz, T
A
= +25°C, unless otherwise noted.)
PARAMETER
DOWNCONVERTER
(RXEN = high)
Downconverter Mixer Voltage Gain
Downconverter Mixer Noise Figure
Downconverter Mixer Input 1dB
Compression Level
Input Third-Order Intercept
Image Rejection
MIXOUT Maximum Voltage Swing
Power-Up Time
Standby to RX or TX (Note 3)
120
475
950
1100
3.6
80
90
10.6
-82
±1
-75
±2
±2.5
6.4
50
850
200
-88
±36
-65
-12
-13
220
-9
90
940
135
1025
440
degrees
dB
dB
mV/dB
dBm
dB
µs
mV
mV
MHz
dBc/Hz
kHz
dBm
dBm
µs
LIMITING AMPLIFIER AND RSSI
(RXEN = high)
V
GC
= 0.8V (Note 4)
Limiter Output Level
Phase Variation
Minimum Linear RSSI Range
Minimum Monotonic RSSI Range
RSSI Slope
RSSI Maximum Intercept
RSSI Relative Error
RSSI Rise Time
Minimum-Scale RSSI Voltage
Maximum-Scale RSSI Voltage
OSCILLATOR
(TXEN = RXEN = high)
Frequency Range
Phase Noise
Maximum LO Frequency Pulling
LO Leakage
Oscillator Buffer Output Power
Maximum Power-Up Time
V
GC
= open
V
GC
= 2.0V (P
LIMIN
= +5dBm)
-75dBm to 5dBm from 50Ω
-75dBm to 5dBm from 50Ω
-80dBm to 10dBm from 50Ω
-75dBm to 5dBm from 50Ω
(Note 5)
T
A
= +25°C
T
A
= -40°C to +85°C (Note 1)
Rise time to within 1dB accuracy; using a 100pF
capacitor from RSSI to GND
At LIMIN input of -75dBm
At LIMIN input of 5dBm
(Note 7)
At 10kHz offset
Standby mode to TX or RX mode
At RXIN port
T
A
= +25°C (Note 8)
T
A
= -40°C to +85°C (Notes 1 and 8)
Shutdown to standby mode (Note 9)
(Note 2)
Two tones at 424MHz and 425MHz,
-30dBm per tone
f
IMAGE
= f
LO
+ f
IF
= 446.4MHz
25
T
A
= +25°C
T
A
= -40°C to +85°C (Note 1)
21.5
20
14
-16
-11
34
2
5
160
625
mVp-p
23.6
25.5
27
dB
dB
dBm
dBm
dB
Vp-p
µs
CONDITIONS
MIN
TYP
MAX
UNITS
_______________________________________________________________________________________
3
Low-Voltage IF Transceiver
with Limiter and RSSI
MAX2511
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2511 test fixture, V
CC
= +3.0V, RXEN = TXEN = low, 0.01µF across CZ and
CZ,
MIXOUT tied to VREF through 165Ω resistor,
TXIN,
TXIN
tied to VREF through 50Ω resistor, TXOUT and
TXOUT
loaded with 100Ω differential, GC open, LIMOUT,
LIMOUT
loaded
with 2kΩ differential, TANK and
TANK
driven with -2.5dBm from a 100Ω source; OSCOUT AC-terminated with 50Ω, 330pF at RSSI
pin, 0.1µF at VREF pin, Rx inputs and Tx outputs differentially coupled, P
RXIN,
RXIN
= -28dBm (200Ω system), f
RXIN,
RXIN
= 425MHz,
f
LO
= 435.7MHz, f
TXIN,
TXIN
= 10.7MHz, T
A
= +25°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
-44
-19
-5
-6
34
40
V
GC
= 2.0V
0.5V < V
GC
< 1.87V
-40dBm < P
OUT
< -10dBm (Note 10)
V
GC
= 2.0V
2
-40
-35
25
30
dBc
dBc
dBm
dBc
-2
dBm
MAX
UNITS
TRANSMITTER
(TXEN = high, V
TXIN
and V
TXIN
= 100mVp-p differential)
V
GC
= 0.5V, T
A
= +25°C
Output Power
V
GC
= open, T
A
= +25°C
V
GC
= 2.0V, T
A
= +25°C
V
GC
= 2.0V, T
A
= -40°C to +85°C (Note 1)
Image Rejection
LO Rejection
Output 1dB Compression Point
Output IM3 Level
Note 1:
Guaranteed by design and characterization.
Note 2:
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.
Note 3:
Assuming the supply voltage has been applied, this includes settling of the limiter offset correction and the Rx or Tx bias
stabilization time. Guaranteed by design.
Note 4:
LIMOUT,
LIMOUT
loaded with 2kΩ differential. With no load, the output swing is approximately twice as large.
Note 5:
The RSSI maximum intercept is the maximum input power (over a statistical sample of parts) at which the RSSI output is 0V.
This point is extrapolated from the linear portion of the RSSI voltage versus limiter input power. This specification and the
RSSI slope define the ideal behavior of the RSSI function (the slope and intercept of a straight line), while the RSSI relative
error specification defines the deviations from this line. See the RSSI Output Voltage vs. Limiter Input Power graph in the
Typical Operating Characteristics.
Note 6:
The RSSI relative error is the deviation from the best-fitting straight line of RSSI output voltage versus limiter input power.
A 0dB relative error is exactly on this line. The limiter input power range for this test is -75dBm to +5dBm from 50Ω. See the
RSSI Relative Error graph in the
Typical Operating Characteristics
.
Note 7:
Operation outside this frequency range is possible but has not been characterized. At lower frequencies, it might be
necessary to overdrive the oscillator with an external signal source.
Note 8:
If a larger output level is required, a higher value of load resistance (up to 100Ω) may be used.
Note 9:
This assumes that the supply voltage has been applied, and includes the settling time of V
REF
, using the
Typical
Operating Circuit.
Note 10:
Using two tones at 10.7MHz and 10.8MHz, 50mVp-p per tone at TXIN,
TXIN.
See
Typical Operating Characteristics.
4
_______________________________________________________________________________________
Low-Voltage IF Transceiver
with Limiter and RSSI
__________________________________________Typical Operating Characteristics
(MAX2511 test fixture, V
CC
= +3.0V, 0.01µF across CZ and
CZ,
MIXOUT tied to VREF through 165Ω resistor, TXIN,
TXIN
tied to VREF
through 50Ω resistor, TXOUT and
TXOUT
loaded with 100Ω differential, GC open, LIMOUT,
LIMOUT
loaded with 2kΩ differential,
TANK and
TANK
driven with -2.5dBm from a 100Ω source; OSCOUT AC-terminated with 50Ω, 100pF at RSSI pin, 0.1µF at VREF pin,
Rx inputs and Tx outputs differentially coupled, P
RXIN,
RXIN
= -28dBm (200Ω system), f
RXIN,
RXIN
= 425MHz, f
LO
= 435.7MHz, f
TXIN,
TXIN
= 10.7MHz, T
A
= +25°C, unless otherwise noted.)
MAX2511
SUPPLY CURRENT
vs. TEMPERATURE
MAX2511 TOC01
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX2511 TOC02
SUPPLY CURRENT
vs. GC VOLTAGE
MAX2511 TOC03
40
35
Tx MODE
30
40
35
30
I
CC
(mA)
50
45
40
I
CC
(mA)
Tx MODE
Tx MODE
I
CC
(mA)
25
Rx MODE
20
15
10
STANDBY MODE
5
0
-40
25
TEMPERATURE (°C)
85
25
20
15
10
STANDBY MODE
5
0
2.7 3.0
3.5
Rx MODE
35
30
25
20
Rx MODE
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
4.0
V
CC
(V)
4.5
5.0
5.5
GC VOLTAGE (V)
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
MAX2511 TOC04
2.0
T
A
= +85°C
24
23
GAIN (dB)
24.5
VOLTAGE GAIN (dB)
24.0
23.5
23.0
22.5
RXEN = HIGH
TXEN = LOW
T
A
= -40°C
I
CC
(µA)
1.5
T
A
= +25°C
22
T
A
= +85°C
21
1.0
T
A
= +25°C
0.5
T
A
= -40°C
0
2.7 3.0
3.5
4.0
4.5
20
19
2.7 3.0
3.5
4.0
4.5
V
CC
(V)
RXEN = HIGH
TXEN = LOW
5.0
5.5
22.0
200
275
350
425
RXIN FREQUENCY (MHz)
5.0
5.5
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
MAX2511/TOC07A
MAX2511-TOC05
2.5
DOWNCONVERTER MIXER CONVERSION
GAIN vs. SUPPLY VOLTAGE
25
DOWNCONVERTER GAIN
vs. RXIN FREQUENCY
25.0
5
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