Document
19-1180; Rev 0; 6/98
Mobile-Radio Analog Controller
________________General Description
The MAX1007 is a multifunctional integrated circuit designed for high-performance mobile radios. It includes one 8-bit analog-to-digital converter (ADC), and two 7-bit and two 6-bit digital-to-analog converters (DACs) for functions including radio-frequency (RF) power sensing and antenna-diversity selection. The ADC provides for power sense, receive-signal strength intensity (RSSI) measurements and system supervision. In the power-sense mode, the ADC converts the power-sensing circuitry signal (representing either the transmitted (Tx) or received (Rx) RF power) into a digital code, ensuring optimum Tx power setting and Rx signal analysis. An additional direct input to the ADC provides for system-supervision measurements, such as power-supply voltages, battery voltage, and temperature. Four DAC blocks typically control DC levels in radios. As part of the Maxim PWT1900 chip set, the two 7-bit DACs control the gain settings and the two 6-bit DACs control the varactor diodes to tune a TCXO and bias a GaAs amplifier. Each DAC register and output can be updated independently, providing maximum flexibility. For antenna diversity, a magnitude-comparison circuit captures and compares two peak signals. A latched logic-comparator output reveals which signal has the largest magnitude. The MAX1007 also includes an onboard voltage reference for the ADC and DACs. The MAX1007 offers a high level of signal integrity with minimal power dissipation. Single-supply operation ranges from +2.85V to +3.6V. To further save power, there are two shutdown modes: standby and total shutdown. Standby is a partial shutdown that keeps the bandgap reference and the 2.4V reference generator active. Total shutdown disables all circuit blocks except the serial interface, reducing supply current to less than 1µA. The MAX1007 is available in a 24-pin SSOP and is specified for commercial and extended temperature ranges.
____________________________Features
o Multi-Input 8-Bit ADC o Two 7-Bit DACs with Buffered Outputs o Two 6-Bit DACs: Buffered/Unbuffered o Power-Sense Conditioning Circuitry o RSSI Measurement o Antenna-Diversity Circuitry o Internal Reference o Serial-Logic Interface o +2.85V to +3.6V Single-Supply Operation o Two Shutdown Modes
MAX1007
Ordering Information
PART MAX1007CAG MAX1007EAG TEMP. RANGE 0°C to +70°C -40°C to +85°C PIN-PACKAGE 24 SSOP 24 SSOP
Pin Configuration appears at end of data sheet.
Functional Diagram
PSDWDW PSDCTRL
PREAMBLE-SWITCHED DIVERSITY DUAL T/H D FLIP-FLOP BANT
REF RSSI PKWDW ADC CTRL RPS FPS1 FPS2 CH1 PEAK DETECTOR POWER SENSE PSOUT ADC SERIAL INTERFACE CH0 CS SCLK DIN DOUT SDG
________________________Applications
PWT1900 Wireless Communications: Cellular Radios PCS Radios PMR/SMR WLL
SDAC XDAC GDAC
POWER SENSE CIRCUITRY SDAC XDAC GDAC 7 6 6
MAX1007
REFERENCE
VREF
KDAC
KDAC
7 PSBIAS
________________________________________________________________ Maxim Integrated Products
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Mobile-Radio Analog Controller MAX1007
ABSOLUTE MAXIMUM RATINGS
AVDD or DVDD to AGND or DGND...........................-0.3V to +6V Digital Inputs to DGND.............................................-0.3V to +6V Analog Inputs to AGND............................................-0.3V to +6V REF to AGND............................................................-0.3V to +6V AGND to DGND .................................................................± 0.3V AVDD to DVDD ....................................................................± 0.3V Maximum Current into Any Pin............................................50mA Continuous Power Dissipation (TA = +70°C) SSOP (derate 8.0mW/°C above +70°C) ......................640mW Operating Temperature Ranges MAX1007CAG.....................................................0°C to +70°C MAX1007EAG ..................................................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°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.
ELECTRICAL CHARACTERISTICS
(AVDD = DVDD = +2.85V to +3.6V, fSCLK = 1.152MHz, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER POWER-SUPPLY REQUIREMENTS Supply Voltages AVDD, DVDD RxEN = 0, TxEN = 1; AVDD = DVDD = 3V; PKWDW = ADCCTRL = DGND RxEN = 0, TxEN = 1; AVDD = DVDD = 3V; PKWDW and ADCCTRL as per state B on Figure 1 2.85 3.0 3.6 V SUPPLY CURRENTS [I(AVDD) + I(DV.