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даташит MAX149 PDF ( Datasheet )

MAX149 Datasheet Download - Maxim

Номер произв MAX149
Описание +2.7V to +5.25V / Low-Power / 8-Channel / Serial 10-Bit ADCs
Производители Maxim
логотип Maxim логотип 



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MAX149 Даташит, Описание, Даташиты
19-0464; Rev 5; 1/12
+2.7V to +5.25V, Low-Power, 8-Channel,
Serial 10-Bit ADCs
General Description
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/
QSPIK and MICROWIREK 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 seri-
al-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 Q1.5% 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
conversion. 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
60FA at reduced sampling rates.
The MAX148/MAX149 are available in 20-pin PDIP and
20-pin SSOP packages.
For 4-channel versions of these devices, see the
MAX1248/MAX1249 data sheet.
Applications
Portable Data Logging
Data Acquisition
Medical Instruments
Battery-Powered Instruments
Pen Digitizers
Process Control
Pin Configuration appears at end of data sheet.
Features
S 8-Channel Single-Ended or 4-Channel Differential
Inputs
S Single-Supply Operation: +2.7V to +5.25V
S Internal 2.5V Reference (MAX149)
S Low Power: 1.2mA (133ksps, 3V Supply)
54µA (1ksps, 3V Supply)
1µA (Power-Down Mode)
S SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire
Serial Interface
S Software-Configurable Unipolar or Bipolar Inputs
S 20-Pin DIP/SSOP Packages
Ordering Information
PART
MAX148ACPP+
MAX148BCPP+
MAX148ACAP+
MAX148BCAP+
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-
PACKAGE
20 PDIP
20 PDIP
20 SSOP
20 SSOP
INL
(LSB)
±1/2
±1
±1/2
±1
Ordering Information continued at end of data sheet.
Contact factory for availability of alternate surface-mount
package.
+Denotes a lead(Pb)-free/RoHS-compliant package.
O TO
+2.5V
ANALOG
INPUTS
4.7FF
0.01FF
Typical Operating Circuit
+3V
CH0 VDD
VDD
0.1FF
DGND
MAX149
CH7 AGND
VREF COM
READJ
CS
SCLK
DIN
DOUT
SSTRB
SHDN
CPU
I/O
SCK (SK)
MOSI (SO)
MISO (SI)
VSS
QSPI is a trademark of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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MAX149 Даташит, Описание, Даташиты
+2.7V to +5.25V, Low-Power, 8-Channel,
Serial 10-Bit ADCs
ABSOLUTE MAXIMUM RATINGS
VDD to AGND, DGND...............................................-0.3V to +6V
AGND to DGND....................................................-0.3V to +0.3V
CH0–CH7, COM to AGND, DGND............ -0.3V to (VDD + 0.3V)
VREF, REFADJ to AGND............................-0.3V to (VDD + 0.3V)
Digital Inputs to DGND............................................-0.3V to +6V
Digital Outputs to DGND........................... -0.3V to (VDD + 0.3V)
Digital Output Sink Current.................................................25mA
Operating Temperature Ranges
MAX148_C_P/MAX149_C_P............................... 0NC to +70NC
MAX148_E_P/MAX149_E_P............................. -40NC to +85NC
MAX149BMAP................................................ -55NC to +125NC
Storage Temperature Range............................. -60NC to +150NC
Lead Temperature (soldering, 10s).................................+300NC
Soldering Temperature (reflow).......................................+260NC
Continuous Power Dissipation (TA = +70NC)
PDIP (derate 11.11mW/NC above +70NC)....................889mW
SSOP (derate 8.00mW/NC above +70NC).....................640mW
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
(VDD = +2.7V to +5.25V; COM = 0; fSCLK = 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps);
MAX149—4.7FF capacitor at VREF pin; MAX148—external reference, VREF = 2.500V applied to VREF pin; TA = TMIN to TMAX, unless
otherwise noted.)
PARAMETER
DC ACCURACY (Note 1)
Resolution
Relative Accuracy (Note 2)
Differential Nonlinearity
Offset Error
Gain Error (Note 3)
Gain Temperature Coefficient
SYMBOL
CONDITIONS
INL
DNL
MAX14_A
MAX14_B
No missing codes over temperature
MAX14_A
MAX14_B
MAX14_A
MAX14_B
MIN TYP MAX UNITS
10 Bits
±0.5
±1.0
LSB
±1 LSB
±0.15
±0.15
±1
±2
LSB
±1
±2
LSB
±0.25
ppm/°C
Channel-to-Channel Offset
Matching
±0.05
LSB
DYNAMIC SPECIFICATIONS (10kHz Sine-Wave Input, 0 to 2.500VP-P, 133ksps, 2.0MHz External Clock, Bipolar Input Mode)
Signal-to-Noise + Distortion
Noise
SINAD
66 dB
Total Harmonic Distortion
Spurious-Free Dynamic Range
Channel-to-Channel Crosstalk
Small-Signal Bandwidth
Full-Power Bandwidth
CONVERSION RATE
Conversion Time (Note 5)
THD
SFDR
Up to the 5th harmonic
65kHz, 2.500VP-P (Note 4)
-3dB rolloff
tCONV
Internal clock, SHDN = unconnected
Internal clock, SHDN = VDD
External clock = 2MHz, 12 clocks/
conversion
-70
70
-75
2.25
1.0
dB
dB
dB
MHz
MHz
5.5 7.5
35 65 μs
6
Track/Hold Acquisition Time
Aperture Delay
Aperture Jitter
tACQ
30
< 50
1.5
μs
ns
ps
2  







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MAX149 Даташит, Описание, Даташиты
+2.7V to +5.25V, Low-Power, 8-Channel,
Serial 10-Bit ADCs
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +5.25V; COM = 0; fSCLK = 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps);
MAX149—4.7FF capacitor at VREF pin; MAX148—external reference, VREF = 2.500V applied to VREF pin; TA = TMIN to TMAX, unless
otherwise noted.)
PARAMETER
SYMBOL
CONVERSION RATE (continued)
Internal Clock Frequency
CONDITIONS
SHDN = unconnected
SHDN = VDD
External Clock Frequency
Data transfer only
ANALOG/COM INPUTS
Input Voltage Range, Single-
Ended and Differential (Note 6)
Unipolar, COM = 0
Bipolar, VCOM = VREF/2
Multiplexer Leakage Current
On/off leakage current, VCH_ = 0 or VDD
Input Capacitance
INTERNAL REFERENCE (MAX149 Only, Reference Buffer Enabled)
VREF Output Voltage
VREF Short-Circuit Current
TA = +25°C (Note 7)
VREF Temperature Coefficient
Load Regulation (Note 8)
MAX149
0 to 0.2mA output load
Capacitive Bypass at VREF
Internal compensation mode
External compensation mode
Capacitive Bypass at REFADJ
REFADJ Adjustment Range
EXTERNAL REFERENCE AT VREF (Buffer Disabled)
VREF Input Voltage Range
(Note 9)
VREF Input Current
VREF Input Resistance
Shutdown VREF Input Current
VREF = 2.500V
REFADJ Buffer-Disable Threshold
EXTERNAL REFERENCE AT REFADJ
Capacitive Bypass at VREF
Reference Buffer Gain
REFADJ Input Current
Internal compensation mode
External compensation mode
MAX149
MAX148
MAX149
MAX148
MIN TYP MAX UNITS
1.8
0.225
0.1 2.0
1 2.0
MHz
MHz
0 to VREF
±VREF/2
±0.01 ±1
16
V
μA
pF
2.470
0
4.7
0.01
2.500
±30
0.35
±1.5
2.530
30
V
mA
ppm/°C
mV
μF
μF
%
1.0
18
VDD -
0.5
100
25
0.01
VDD +
50mV
150
10
V
μA
kΩ
µA
V
0
4.7
2.06
2.00
±50
±10
µF
V/V
µA
  3










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