MAX1007 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Mobile-Radio Analog Controller

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 con-
verts 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 on-
board 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.
________________________Applications
PWT1900
Wireless Communications:
Cellular Radios PMR/SMR
PCS Radios
WLL
____________________________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
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
RSSI
PKWDW
ADC CTRL
RPS
FPS1
FPS2
SDAC
XDAC
GDAC
KDAC
REF
CH1
POWER
ADC
SENSE
PSOUT
CH0
POWER SENSE CIRCUITRY
SDAC ⁷
XDAC ⁶
MAX1007
GDAC ⁶
KDAC ⁷
CS
SCLK
DIN
DOUT
SDG
VREF
PSBIAS
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