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參數(shù)資料
| 型號： | MAX149 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | +2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs |
| 中文描述： | +2.7V至+5.25V、低功耗、8通道、串行10位ADC |
| 文件頁數(shù)： | 1/24頁 |
| 文件大?。?/td> | 221K |
| 代理商： | MAX149 |
General Desc ription
The MAX148/MAX149 10-bit data-acquisition systems
combine an 8-channel multiplexer, high-bandwidth
track/hold, and serial interface with high conversion
speed and low power consumption. They operate from a
single +2.7V to +5.25V supply, and sample to 133ksps.
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 MAX148/
MAX149 use either the internal clock or an external serial-
interface clock to perform successive-approximation
analog-to-digital conversions.
The MAX149 has an internal 2.5V reference, while the
MAX148 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 MAX148/MAX149, 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 MAX148/MAX149 are available in a 20-pin DIP and a
20-pin SSOP.
For 4-channel versions of these devices, see the
MAX1248/MAX1249 data sheet.
________________________Applic ations
Portable Data Logging
Data Acquisition
Medical Instruments
Battery-Powered Instruments
Pen Digitizers
Process Control
____________________________Features
o
8-Channel Single-Ended or 4-Channel
Differential Inputs
o
Single-Supply Operation: +2.7V to +5.25V
o
Internal 2.5V Reference (MAX149)
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
M
+2.7V to +5.25V, Low-Power, 8-Channel,
S erial 10-Bit ADCs
________________________________________________________________ Maxim Integrated Products
1
V
DD
I/O
SCK (SK)
MOSI (SO)
MISO(SI)
V
SS
SHDN
SSTRB
DOUT
DIN
SCLK
CS
COM
AGND
DGND
V
DD
CH7
4.7
μ
F
0.1
μ
F
CH0
0V TO
+2.5V
ANALOG
INPUTS
MAX149
CPU
+3V
VREF
0.01
μ
F
REFADJ
__________Typic al Operating Circ uit
19-0464; Rev 2; 5/98
EVALUATION KIT
AVAILABLE
PART
MAX148
ACPP
MAX148BCPP
MAX148ACAP
MAX148BCAP
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE
PIN-PACKAGE
20 Plastic DIP
20 Plastic DIP
20 SSOP
20 SSOP
Ordering Information
Ordering Information continued at end of data sheet.
Contact factory for availability of alternate surface-mount
packages.
INL
(LSB)
±1/2
±1
±1/2
±1
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
Pin Configuration appears at end of data sheet.
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.
相關(guān)PDF資料 |
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| MAX149BCAP | +2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs |
| MAX149BEAP | +2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs |
| MAX149BEPP | +2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs |
| MAX148ACAP | +2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs |
| MAX148AEPP | +2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs |
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