Maxim MAX2511EEI Datasheet

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_______________General Description

The MAX2511 is a complete, highly integrated IF trans­ceiver 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 sup­pression followed by an IF buffer that can drive an off­chip IF filter; an on-chip limiting amplifier offering 90dB
of monotonic received-signal-strength indication (RSSI);
and a robust limiter output driver. The transmit image­reject mixer generates a clean output spectrum to mini­mize 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.

________________________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

____________________________Features

♦ Single +2.7V to +5.5V Supply
♦ Complete Receive Path:

200MHz to 440MHz (first IF) to
8MHz to 13MHz (second IF)

♦ 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

MAX2511

Low-Voltage IF Transceiver

with Limiter and RSSI

________________________________________________________________

Maxim Integrated Products

1

28
27
26
25
24
23

21
20

19
18
17
16
15

1LIMIN VREF

MIXOUT
GND
RXIN
TXOUT
TXOUT

V

CC

V

CC

GND

TXEN
RXEN
TXIN
TXIN

CZ
CZ

RSSI

GC

TANK

TANK

GND

OSCOUT

LIMOUT
LIMOUT

V

CC

V

CC

2
3
4
5
6

8

9
10
11
12
13
14

QSOP

TOP VIEW

MAX2511

22 RXINGND 7

__________________Pin Configuration

PART

MAX2511EEI -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

28 QSOP

EVALUATION KIT

AVAILABLE

______________Ordering Information

Typical Operating Circuit appears at end of data sheet.

19-1209; Rev 0; 10/97

MAX2511

Low-Voltage IF Transceiver
with Limiter and RSSI

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +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

; TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°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.

VCCto GND .............................................................-0.3V to 8.0V

V

CC

to Any Other VCC........................................................±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 (VCC+ 0.3V)

RXEN, TXEN, GC Voltage...........................-0.3V to (V

CC

+ 0.3V)

RXEN, TXEN, GC Input Current............................................1mA

RSSI Voltage...............................................-0.3V to (VCC+ 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

Internally terminated to 1.35VGC Input Resistance 60 80 125

kΩ

LIMOUT, LIMOUT
Differential Output Impedance

2

kΩ

(Note 1)

RXEN, TXEN

RXEN, TXEN

CONDITIONSPARAMETER MIN TYP MAX UNITS

Digital Input Current Low -5 -1 µA

Digital Input Current High 23 32 µA

VREF Voltage

V

CC

/ 2 - V

CC

/ 2 V

CC

/ 2 +

100mV 100mV

V

Digital Input Voltage High

Operating Voltage Range 2.7 3.0 5.5 V

2.0 V

Digital Input Voltage Low 0.4 V

24

26

9.5

VCC= 3.0V
TA= +25°C

Typical Supply Current

0.1

mA

38.5

45

14.5

VCC= 2.7V to 5.5V,
TA= -40°C to +85°C

Worst-Case Supply Current

5

mA

µA

µA

Rx mode, RXEN = high,
TXEN = low

Tx mode, RXEN = low,
TXEN = high, VGC= 0.5V

Standby mode, RXEN = high,
TXEN = high

Shutdown mode, RXEN = low,
TXEN = low

Rx mode, RXEN = high,
TXEN = low

Tx mode, RXEN = low,
TXEN = high, VGC= 0.5V

Standby mode, RXEN = high,
TXEN = high

Shutdown mode, RXEN = low,
TXEN = low

MAX2511

Low-Voltage IF Transceiver

with Limiter and RSSI

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(MAX2511 test fixture, VCC= +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, TA= +25°C, unless otherwise noted.)

21.5 23.6 25.5

dBm-16

Downconverter Mixer Input 1dB
Compression Level

dBm-11Input Third-Order Intercept

dB25 34Image Rejection

UNITSMIN TYP MAXPARAMETER CONDITIONS

TA= +25°C

(Note 2)

Two tones at 424MHz and 425MHz,

-30dBm per tone
f

IMAGE

= fLO+ fIF= 446.4MHz

Vp-p2MIXOUT Maximum Voltage Swing

µs5Power-Up Time Standby to RX or TX (Note 3)

mVp-p

120 160

Limiter Output Level

VGC= 0.8V (Note 4)

475 625
950 1100

degrees3.6Phase Variation

-75dBm to 5dBm from 50Ω
dB80Minimum Linear RSSI Range

-75dBm to 5dBm from 50Ω
dB90Minimum Monotonic RSSI Range

-80dBm to 10dBm from 50Ω

mV/dB10.6RSSI Slope

-75dBm to 5dBm from 50Ω

dBm-82 -75RSSI Maximum Intercept (Note 5)

µs6.4RSSI Rise Time

Rise time to within 1dB accuracy; using a 100pF
capacitor from RSSI to GND

mV50 90 135Minimum-Scale RSSI Voltage At LIMIN input of -75dBm
mV850 940 1025Maximum-Scale RSSI Voltage At LIMIN input of 5dBm

dBm-65LO Leakage At RXIN port

-12 -9TA= +25°C (Note 8)

µs220Maximum Power-Up Time Shutdown to standby mode (Note 9)

dBc/Hz-88Phase Noise

MHz200 440Frequency Range

kHz±36Maximum LO Frequency Pulling

(Note 7)
At 10kHz offset
Standby mode to TX or RX mode

±1 ±2TA= +25°C

dB14Downconverter Mixer Noise Figure

dB

20 27

Downconverter Mixer Voltage Gain

TA= -40°C to +85°C (Note 1)

dB

±2.5

RSSI Relative Error

TA= -40°C to +85°C (Note 1)

dBm

-13

Oscillator Buffer Output Power

TA= -40°C to +85°C (Notes 1 and 8)

VGC= 2.0V (P

LIMIN

= +5dBm)

VGC= open

DOWNCONVERTER (RXEN = high)

LIMITING AMPLIFIER AND RSSI (RXEN = high)

OSCILLATOR (TXEN = RXEN = high)

MAX2511

Low-Voltage IF Transceiver
with Limiter and RSSI

4 _______________________________________________________________________________________

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

.

-44

Output Power

VGC= 0.5V, TA= +25°C

dBm

-19VGC= open, TA= +25°C

-5 -2VGC= 2.0V, TA= +25°C

-6VGC= 2.0V, TA= -40°C to +85°C (Note 1)

dBc40 30LO Rejection

dBm2Output 1dB Compression Point VGC= 2.0V

UNITSMIN TYP MAXPARAMETER CONDITIONS

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2511 test fixture, VCC= +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, TA= +25°C, unless otherwise noted.)

-40

Output IM3 Level

0.5V < VGC< 1.87V

-40dBm < P

OUT

< -10dBm (Note 10)

dBc

-35VGC= 2.0V

dBc34 25Image Rejection

TRANSMITTER (TXEN = high, V

TXIN

and V

TXIN

= 100mVp-p differential)

MAX2511

Low-Voltage IF Transceiver

with Limiter and RSSI

_______________________________________________________________________________________

5

40
35

Tx MODE

Rx MODE

STANDBY MODE

0

-40 85

SUPPLY CURRENT

vs. TEMPERATURE

10

5

30
25

MAX2511 TOC01

TEMPERATURE (°C)

I

CC

(mA)

25

20
15

40
35

0

2.7 3.0 5.5

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

10

5

30
25

MAX2511 TOC02

VCC (V)

I

CC

(mA)

4.0 4.5 5.03.5

20
15

STANDBY MODE

Tx MODE

Rx MODE

50

45

20

0 0.4

SUPPLY CURRENT

vs. GC VOLTAGE

40

30

35

MAX2511 TOC03

GC VOLTAGE (V)

I

CC

(mA)

1.6 2.0 2.4 2.8 3.21.20.8

25

Tx MODE

Rx MODE

2.5

0

2.7 3.0 5.5

SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE

0.5

2.0

1.5

MAX2511 TOC04

SUPPLY VOLTAGE (V)

I

CC

(µA)

4.0 4.5 5.03.5

1.0

TA = +85°C

TA = +25°C

TA = -40°C

25

24

23

21

20

22

19

MAX2511-TOC05

VCC (V)

2.7 3.0 3.5 4.0 4.5 5.0 5.5

DOWNCONVERTER MIXER CONVERSION

GAIN vs. SUPPLY VOLTAGE

GAIN (dB)

RXEN = HIGH
TXEN = LOW

TA = +85°C

TA = +25°C

TA = -40°C

22.0

23.0

22.5

23.5

24.5

24.0

RXEN = HIGH
TXEN = LOW

25.0

200 275 350 425

DOWNCONVERTER GAIN

vs. RXIN FREQUENCY

MAX2511/TOC07A

RXIN FREQUENCY (MHz)

VOLTAGE GAIN (dB)

__________________________________________Typical Operating Characteristics

(MAX2511 test fixture, VCC= +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, TA= +25°C, unless otherwise noted.)