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PDF MAX147 Data sheet ( Hoja de datos )
| Número de pieza | MAX147 | |
| Descripción | +2.7Low-Power / 8-Channel / Serial 12-Bit ADCs | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-0465; Rev 2; 10/01
EVAALVUAAILTAIOBNLEKIT
+2.7V, Low-Power, 8-Channel,
Serial 12-Bit ADCs
General Description
The MAX146/MAX147 12-bit data-acquisition systems
combine an 8-channel multiplexer, high-bandwidth
track/hold, and serial interface with high conversion
speed and low power consumption. The MAX146 oper-
ates from a single +2.7V to +3.6V supply; the MAX147
operates from a single +2.7V to +5.25V supply. Both
devices’ analog inputs are software configurable for
unipolar/bipolar and single-ended/differential operation.
The 4-wire serial interface connects directly to SPI™/
QSPI™ and MICROWIRE™ devices without external
logic. A serial strobe output allows direct connection to
TMS320-family digital signal processors. The
MAX146/MAX147 use either the internal clock or an exter-
nal serial-interface clock to perform successive-approxi-
mation analog-to-digital conversions.
The MAX146 has an internal 2.5V reference, while the
MAX147 requires an external reference. Both parts have
a reference-buffer amplifier with a ±1.5% voltage-
adjustment range.
These devices provide a hard-wired SHDN pin and a
software-selectable power-down, and can be pro-
grammed to automatically shut down at the end of a con-
version. Accessing the serial interface automatically
powers up the MAX146/MAX147, and the quick turn-on
time allows them to be shut down between all conver-
sions. This technique can cut supply current to under
60µA at reduced sampling rates.
The MAX146/MAX147 are available in 20-pin DIP and
SSOP packages.
For 4-channel versions of these devices, see the
MAX1246/MAX1247 data sheet.
________________________Applications
____________________________Features
o 8-Channel Single-Ended or 4-Channel
Differential Inputs
o Single-Supply Operation
+2.7V to +3.6V (MAX146)
+2.7V to +5.25V (MAX147)
o Internal 2.5V Reference (MAX146)
o Low Power
1.2mA (133ksps, 3V supply)
54µA (1ksps, 3V supply)
1µA (power-down mode)
o SPI/QSPI/MICROWIRE/TMS320-Compatible
4-Wire Serial Interface
o Software-Configurable Unipolar or Bipolar Inputs
o 20-Pin DIP/SSOP Packages
Ordering Information
PART
MAX146ACPP
MAX146BCPP
MAX146ACAP
MAX146BCAP
MAX146BC/D
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
20 Plastic DIP
20 Plastic DIP
20 SSOP
20 SSOP
Dice*
INL
(LSB)
±1/2
±1
±1/2
±1
±1
Ordering Information continued at end of data sheet.
*Dice are specified at TA = +25°C, DC parameters only.
Typical Operating Circuit
Portable Data Logging Data Acquisition
Medical Instruments Battery-Powered Instruments
Pen Digitizers
Process Control
Pin Configuration appears at end of data sheet.
SPI and QSPI are registered trademarks of Motorola, Inc.
MICROWIRE is a registered trademark of National Semiconductor
Corp.
0V TO
+2.5V
ANALOG
INPUTS
4.7µF
0.047µF
CH0 VDD
DGND
MAX146 AGND
CH7
VREF
REFADJ
COM
CS
SCLK
DIN
DOUT
SSTRB
SHDN
+3V
VDD
0.1µF
CPU
I/O
SCK (SK)
MOSI (SO)
MISO (SI)
VSS
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
+2.7V, Low-Power, 8-Channel,
Serial 12-Bit ADCs
TIMING CHARACTERISTICS
(VDD = +2.7V to +3.6V (MAX146); VDD = +2.7V to +5.25V (MAX147); TA = TMIN to TMAX; unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP
Acquisition Time
tACQ
1.5
DIN to SCLK Setup
tDS
100
DIN to SCLK Hold
tDH
0
SCLK Fall to Output Data Valid
tDO Figure 1
MAX14_ _C/E
FMigAuXr1e41_ _M
20
20
CS Fall to Output Enable
CS Rise to Output Disable
CS to SCLK Rise Setup
CS to SCLK Rise Hold
tDV
tTR
tCSS
tCSH
Figure 1
Figure 2
100
0
SCLK Pulse Width High
tCH
200
SCLK Pulse Width Low
tCL
200
SCLK Fall to SSTRB
CS Fall to SSTRB Output Enable
CS Rise to SSTRB Output Disable
tSSTRB
tSDV
tSTR
Figure 1
External clock mode only, Figure 1
External clock mode only, Figure 2
SSTRB Rise to SCLK Rise
tSCK Internal clock mode only (Note 9)
0
MAX
200
240
240
240
240
240
240
UNITS
µs
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note 1: Tested at VDD = 2.7V; COM = 0; unipolar single-ended input mode.
Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range has
been calibrated.
Note 3: MAX146—internal reference, offset nulled; MAX147—external reference (VREF = +2.5V), offset nulled.
Note 4: Ground “on” channel; sine wave applied to all “off” channels.
Note 5: Conversion time defined as the number of clock cycles multiplied by the clock period; clock has 50% duty cycle.
Note 6: The common-mode range for the analog inputs is from AGND to VDD.
Note 7: External load should not change during conversion for specified accuracy.
Note 8: ADC performance is limited by the converter’s noise floor, typically 300µVp-p.
Note 9: Guaranteed by design. Not subject to production testing.
| |Note 10: Measured as VFS(2.7V) - VFS(VDD, MAX) .
Typical Operating Characteristics
(VDD = 3.0V, VREF = 2.5V, fSCLK = 2.0MHz, CLOAD = 20pF, 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
INTEGRAL NONLINEARITY
vs. CODE
1024 2048 3072 4096
CODE
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
2.25
INTEGRAL NONLINEARITY
vs. SUPPLY VOLTAGE
MAX146
MAX147
2.75 3.25 3.75 4.25 4.75
VDD (V)
5.25
INTEGRAL NONLINEARITY
vs. TEMPERATURE
0.50
0.45 VDD = 2.7V
0.40
0.35
0.30 MAX146
0.25
0.20
0.15 MAX147
0.10
0.05
0
-60 -20 20 60 100
TEMPERATURE (°C)
140
_______________________________________________________________________________________ 5
5 Page 
+2.7V, Low-Power, 8-Channel,
Serial 12-Bit ADCs
Table 1. Control-Byte Format
BIT 7
(MSB)
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
(LSB)
START
SEL2
SEL1
SEL0
UNI/BIP
SGL/DIF
PD1
PD0
BIT
7(MSB)
6
5
4
NAME
START
SEL2
SEL1
SEL0
DESCRIPTION
The first logic “1” bit after CS goes low defines the beginning of the control byte.
These three bits select which of the eight channels are used for the conversion (Tables 2 and 3).
3
UNI/BIP
1 = unipolar, 0 = bipolar. Selects unipolar or bipolar conversion mode. In unipolar mode, an
analog input signal from 0V to VREF can be converted; in bipolar mode, the signal can range
from -VREF/2 to +VREF/2.
2
SGL/DIF
1 = single ended, 0 = differential. Selects single-ended or differential conversions. In single-
ended mode, input signal voltages are referred to COM. In differential mode, the voltage
difference between two channels is measured (Tables 2 and 3).
1
0(LSB)
PD1
PD0
Selects clock and power-down modes.
PD1 PD0 Mode
00
Full power-down
01
Fast power-down (MAX146 only)
10
Internal clock mode
11
External clock mode
Table 2. Channel Selection in Single-Ended Mode (SGL/DIF = 1)
SEL2
0
1
SEL1
0
0
SEL0
0
0
CH0
+
CH1
+
CH2
CH3
CH4
CH5
00 1
+
10 1
+
01 0
11 0
+
+
01 1
11 1
Table 3. Channel Selection in Differential Mode (SGL/DIF = 0)
CH6
+
CH7
+
COM
–
–
–
–
–
–
–
–
SEL2
0
0
0
0
1
1
1
1
SEL1
0
0
1
1
0
0
1
1
SEL0
0
1
0
1
0
1
0
1
CH0
+
–
CH1
–
+
CH2
+
–
CH3
–
+
CH4
+
–
CH5
–
+
CH6
CH7
+–
–+
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MAX147.PDF ] | |
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