ML2731CT Micro Linear, ML2731CT Datasheet

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ML2731CT

Manufacturer Part Number
ML2731CT
Description
PA Bias Controller
Manufacturer
Micro Linear
Datasheet
The ML2731 is a power amplifier (PA) bias controller with
support circuits for a typical radio transceiver. The IC
integrates a PA bias controller, a PA DC switch, a crystal
oscillator circuit, a negative voltage generator and two
voltage regulators. It can be used with GaAs FETs and
silicon bipolar devices.
Micro Linear’s ML2731, along with the ML2712 and the
ML2713, form a complete transceiver solution for the 2.4
GHz IEEE802.11 communication standard, as well as
other wireless ISM communication products.
In addition to supporting Micro Linear’s transceiver chip
set, the ML2731 can stand alone as:
GENERAL DESCRIPTION
SIMPLIFIED BLOCK DIAGRAM
A compact bias voltage controller
A compact negative voltage generator
A compact crystal oscillator
PRELIMINARY DATASHEET
ML2731 PA Bias Controller
GaAs FET Power Amplifier
VNEG
VPA
VBIAS
C1
C2
and current sense
PA on/off switch
Negative voltage
Bias Control
Regulator
generator
Voltage
REGO
n
n
n
n
n
n
n
n
n
n
n
n
January, 2000
FEATURES
APPLICATIONS
SINO
Sets PA current and power output using a bias control
loop
Integrates a PA DC supply switch
Prevents PA power-on if negative voltage is not present
Integrates all circuits needed for supporting a crystal
oscillator with 10MHz to 40MHz frequency range
Incorporates a fast starting, high switching frequency,
negative voltage generator requiring only small
ceramic capacitors
Contains voltage regulators for an oscillator, a negative
voltage generator and a 50mA 3.0V LDO output
Requires less than 1mA of current when powered down
Supply voltage ranges from 3.3V to 5.5V
Cellular and Cordless Radios
WLAN Radios
Radios with GaAs FET Power Amplifiers
Fixed and Mobile radio transceivers
ML2712
ML2713
Sine & square
Radio
ML2731
wave drivers
Oscillator
Crystal
CLKO
XIN
Baseband Controller
XOUT
PAEN
ICON
NEGEN
PDN
(e.g. MSM7730B)
Crystal
PRELIMINARY

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ML2731CT Summary of contents

Page 1

... It can be used with GaAs FETs and silicon bipolar devices. Micro Linear’s ML2731, along with the ML2712 and the ML2713, form a complete transceiver solution for the 2.4 GHz IEEE802.11 communication standard, as well as other wireless ISM communication products. ...

Page 2

... Micro Linear products are not designed for use in medical, life saving, or life sustaining applications. © 2000. Micro Linear is a registered trademark of Micro Linear Corporation. All other trademarks are the property of their respective owners. Products described herein may be covered by one or more of the following U.S. patents: 4,897,611; 4,964,026; 5,027,116; ...

Page 3

BLOCK DIAGRAM XIN 15 XOUT 16 PAEN 6 NEGEN 7 PDN 14 REGO 3 PRELIMINARY SINO CLKO 1 8 BUFFER AND DRIVERS NEGATIVE OSCILLATOR VOLTAGE AND GENERATOR DIVIDER REFERENCE BIAS GENERATOR CONTROL AND LOGIC SWITCH AND CURRENT SENSE REGULATOR January, ...

Page 4

PIN CONFIGURATION PIN DESCRIPTIONS Pin # Signal Name 1 SINO O (ANLG) 2 VCC O (ANLG) 3 REGO O (ANLG) 4 VBIAS O (ANLG) 5 ICON 6 PAEN 7 NEGEN 8 CLKO 9 GND 10 VNEG O (ANLG ...

Page 5

PIN DESCRIPTIONS (continued) Pin # Signal Name (ANLG) 13 VPA O (ANLG) 14 PDN I (ANLG) 15 XIN I (ANLG) 16 XOUT I (ANLG) PRELIMINARY I/O Noise Shunt. Negative voltage generator bypass capacitor connection. Typically a 100nF ...

Page 6

FUNCTIONAL DESCRIPTION INTRODUCTION EXTERNAL INTERFACES The ML2731 has 3 logic inputs: PAEN, NEGEN and PDN. These control lines are used to select the mode of operation to be either SLEEP, STANDBY, PRETX or TRANSMIT. (See Table ...

Page 7

FUNCTIONAL DESCRIPTION CRYSTAL OSCILLATOR The crystal oscillator circuit is powered chip regulator and generates a square wave signal and a sine wave signal. The sine wave is intended for radio PLL circuits, and the square wave clock ...

Page 8

FUNCTIONAL DESCRIPTION PA SUPPLY DC SWITCH The ML2731 includes a DC switch for connecting the supply voltage to an external PA. PAEN activates the DC switch during TRANSMIT mode. To ensure the external PA devices power up correctly, the chip ...

Page 9

FUNCTIONAL DESCRIPTION Baseband IC DAC Reference current for PA control REXT OR VCC VREF R1 R2 GND 600 500 400 300 200 100 0 0 0.5 1 Figure 10: PA Current Control Loop Operation With REXT At PRELIMINARY VCC Supply ...

Page 10

FUNCTIONAL DESCRIPTION RECOMMENDED PA BIAS OPERATION An example of how the PA bias operates is shown in Figure 11. A three-step reference voltage ramp is generated using an external baseband circuit and is applied to the ICON pin via an ...

Page 11

ELECTRICAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. VCC ......................................................................... 6.0V All Other Inputs .................... ...

Page 12

... PHYSICAL DIMENSIONS 0.192 - 0.202 (4.88 - 5.13) 16 PIN 0.026 BSC (0.65 BSC) 0.008 - 0.012 0.033 - 0.037 (0.20 - 0.30) (0.84 - 0.94) ORDERING INFORMATION PART NUMBER ML2731CT ML2731ET 12 PRELIMINARY DATASHEET PRELIMINARY Package: T16 16-Pin TSSOP 0.169 - 0.177 0.246 - 0.258 (4.29 - 4.50) (6.25 - 6.55) 0.043 MAX (1.10 MAX) 0º - 8º 0.020 - 0.028 0.002 - 0.006 SEATING PLANE (0 ...

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