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PDF MAX1007 Data sheet ( Hoja de datos )
| Número de pieza | MAX1007 | |
| Descripción | Mobile-Radio Analog Controller | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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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
SENSE
PSOUT
ADC
CH0
POWER SENSE CIRCUITRY
SDAC 7
XDAC 6
MAX1007
GDAC 6
KDAC 7
CS
SCLK
DIN
DOUT
SDG
VREF
PSBIAS
________________________________________________________________ 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.
1 page  
Mobile-Radio Analog Controller
ELECTRICAL CHARACTERISTICS (continued)
(AVDD = DVDD = +2.85V to +3.6V, fSCLK = 1.152MHz, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
ADCCTRL Low to RF input
t10
RF input on RSSI, RPS, FPS1, FPS2, or
PSBIAS, (Figure 4c)
200 ns
PSDWDW Low to BANT Valid
SCLK Duty Cycle
t11 CL = 20pF (Figure 4c)
100 ns
50 %
Note 1: All digital inputs at DVDD or DGND.
Note 2: All DACs use an internal reference voltage of 2.42V.
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
0
DIFFERENTIAL NONLINEARITY
50 100 150 200 250 300
CODES
SUPPLY CURRENT vs. TEMPERATURE
(Tx MODE)
1.55
1.50
VDD = 3.6V
1.45
1.40 VDD = 2.85V
1.35
1.30
1.25
-40
25
85
TEMPERATURE (°C)
SUPPLY CURRENT vs. TEMPERATURE
(Rx MODE)
2.40
2.30 VDD = 3.6V
2.20
VDD = 2.85V
2.10
2.00
1.90
1.80
-40 25 85
TEMPERATURE (°C)
REFERENCE VOLTAGE
vs. TEMPERATURE
1.025
1.024
VDD = 3.6V
1.023
1.022
1.021
VDD = 2.85V
1.020
1.019
-40
-5 25 55
TEMPERATURE (°C)
85
PS BIAS VOLTAGE vs. TEMPERATURE
1.86
VDD = 3.6V
1.84
VDD = 2.85V
1.82
1.80
1.78
1.76
-40
-5 25 55
TEMPERATURE (°C)
85
_______________________________________________________________________________________ 5
5 Page 
Mobile-Radio Analog Controller
ADCCTRL
RSSI
RPS
FPS1
FPS2
PSBIAS
PSDWDW
BANT
t10
OLD DATA
t11
VALID
Figure 4c. Power-Sense/Best-Antenna Detailed Interface
Table 2. Power Modes
RxEN,
TxEN
00
01
10
11
DESCRIPTION
Total shutdown
Transmit mode, all DACs enabled
Receive mode, SDAC and GDAC outputs disabled
Standby: REF, GDAC, and XDAC enabled. Rest of
IC is shut down.
WRITE CS
SCLK
DIN
READ
CS
SCLK
DIN
DOUT
START A2 A1 A0 RxEN TxEN SD LD D7 D6 D5 D4 D3 D2 D1 D0
COMMAND BYTE
START A2 A1 A0 RxEN TxEN SD LD
COMMAND BYTE
D7 D6 D5 D4 D3 D2 D1
D0
Figure 4d. Serial-Interface Timing
Applications Information
Precautions must be taken to minimize RF coupling
through the IC.
Shutdown Modes
At power-up, the device initializes in total shutdown
mode. The digital interface is always active. Table 2
describes the various power modes available.
When the PGA is not on (in shutdown, standby, or
receive mode, or when PKWDW is low), the PS input
pins (RPS, FPS1, FPS2) are pulled down to ground. To
minimize RF coupling, the unselected channels are
also pulled down to ground when the circuit is active.
The current source and the 1.87V PSBIAS voltage gen-
erator are turned on only when the device is performing
the transmit power-sense measurement.
Power-Supply Bypassing and
Ground Management
Optimum system performance is obtained with printed
circuit boards that use separate analog and digital
ground planes. Wire-wrap boards are not recommend-
ed. The two ground planes should be connected
together at the low-impedance power-supply source.
Bypass AVDD with a 0.1µF ceramic capacitor connect-
ed between AVDD and AGND. Mount it with short leads
close to the device. Similarly bypass DVDD with a 0.1µF
ceramic capacitor connected between DVDD and
DGND. Ferrite beads may also be used to further iso-
late the analog and digital power supplies.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX1007.PDF ] | |
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