19-1532; Rev 3; 12/02
KIT
ATION
EVALU
E
L
B
AVAILA
250ksps, +3V, 8-/4-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
Applications
Features
♦ 12-Bit Resolution, ±0.5 LSB Linearity
♦ +3V Single Operation
♦ User-Adjustable Logic Level (+1.8V to +3.6V)
♦ Internal +2.5V Reference
♦ Software-Configurable, Analog Input Multiplexer
8-Channel Single-Ended/
4-Channel Pseudo-Differential (MAX1291)
4-Channel Single-Ended/
2-Channel Pseudo-Differential (MAX1293)
♦ Software-Configurable, Unipolar/Bipolar Inputs
♦ Low Power: 1.9mA (250ksps)
1.0mA (100ksps)
400µA (10ksps)
2µA (Shutdown)
♦ Internal 3MHz Full-Power Bandwidth Track/Hold
♦ Byte-Wide Parallel (8 + 4) Interface
♦ Small Footprint: 28-Pin QSOP (MAX1291)
24-Pin QSOP (MAX1293)
Pin Configurations
TOP VIEW
28 VLOGIC
HBEN 1
D7 2
27 VDD
D6 3
26 REF
D5 4
25 REFADJ
D4 5
D3/D11 6
24 GND
MAX1291
23 COM
D2/D10 7
22 CH0
Industrial Control Systems
Data Logging
Energy Management
Patient Monitoring
D1/D9 8
21 CH1
Touch Screens
D0/D8 9
20 CH2
INT 10
19 CH3
Data-Acquisition Systems
Ordering Information
INL
(LSB)
TEMP RANGE
PIN-PACKAGE
MAX1291ACEI
0°C to +70°C
28 QSOP
±0.5
MAX1291BCEI
0°C to +70°C
28 QSOP
±1
MAX1291AEEI
-40°C to +85°C
28 QSOP
±0.5
MAX1291BEEI
-40°C to +85°C
28 QSOP
±1
PART
Ordering Information continued at end of data sheet.
RD 11
18 CH4
WR 12
17 CH5
CLK 13
16 CH6
CS 14
15 CH7
QSOP
Pin Configurations continued at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products
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
MAX1291/MAX1293
General Description
The MAX1291/MAX1293 low-power, 12-bit analog-to-digital converters (ADCs) feature a successive-approximation ADC, automatic power-down, fast wake-up (2µs), an
on-chip clock, +2.5V internal reference, and a highspeed, byte-wide parallel interface. They operate with a
single +3V analog supply and feature a VLOGIC pin that
allows them to interface directly with a +1.8V to +5.5V
digital supply.
Power consumption is only 5.7mW (VDD = VLOGIC) at the
maximum sampling rate of 250ksps. Two software-selectable power-down modes enable the MAX1291/
MAX1293 to be shut down between conversions;
accessing the parallel interface returns them to normal
operation. Powering down between conversions can cut
supply current to under 10µA at reduced sampling rates.
Both devices offer software-configurable analog inputs
for unipolar/bipolar and single-ended/pseudo-differential operation. In single-ended mode, the MAX1291 has
eight input channels and the MAX1293 has four input
channels (four and two input channels, respectively,
when in pseudo-differential mode).
Excellent dynamic performance and low power, combined with ease of use and small package size, make
these converters ideal for battery-powered and dataacquisition applications or for other circuits with demanding power consumption and space requirements.
The MAX1291/MAX1293 tri-states INT when CS goes
high. Refer to MAX1261/MAX1263 if tri-stating INT is not
desired.
The MAX1291 is available in a 28-pin QSOP package,
while the MAX1293 is available in a 24-pin QSOP. For
pin-compatible +5V, 12-bit versions, refer to the
MAX1290/MAX1292 data sheet.
MAX1291/MAX1293
250ksps, +3V, 8-/4-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
ABSOLUTE MAXIMUM RATINGS
VDD to GND ..............................................................-0.3V to +6V
VLOGIC to GND.........................................................-0.3V to +6V
CH0–CH7, COM to GND ............................-0.3V to (VDD + 0.3V)
REF, REFADJ to GND ................................-0.3V to (VDD + 0.3V)
Digital Inputs to GND ...............................................-0.3V to +6V
Digital Outputs (D0–D11, INT) to GND...-0.3V to (VLOGIC + 0.3V)
Continuous Power Dissipation (TA = +70°C)
24-Pin QSOP (derate 9.5mW/°C above +70°C) ...........762mW
28-Pin QSOP (derate 8.00mW/°C above +70°C) .........667mW
Operating Temperature Ranges
MAX1291_C_ _/MAX1293_C_ _ ..............................0°C to +70°C
MAX1291_E_ _/MAX1293_E_ _ ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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 = VLOGIC = +2.7V to +3.6V, COM = GND, REFADJ = VDD, VREF = +2.5V, 4.7µF capacitor at REF pin, fCLK = 4.8MHz (50% duty
cycle); TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC ACCURACY (Note 1)
Resolution
RES
Relative Accuracy (Note 2)
INL
Differential Nonlinearity
DNL
12
Bits
MAX129_A
±0.5
MAX129_B
±1
No missing codes over temperature
±1
LSB
Offset Error
±4
LSB
Gain Error (Note 3)
±4
LSB
LSB
Gain Temperature Coefficient
±2.0
ppm/°C
Channel-to-Channel Offset
Matching
±0.2
LSB
DYNAMIC SPECIFICATIONS (fIN(sine wave) = 50kHz, VIN = 2.5VP-P, 250ksps, external fCLK = 4.8MHz, bipolar input mode)
Signal-to-Noise Plus Distortion
SINAD
Total Harmonic Distortion
(including 5th-order harmonic)
THD
Spurious-Free Dynamic Range
SFDR
67
70
dB
-78
80
dB
dB
fIN1 = 49kHz, fIN2 = 52kHz
76
dB
Channel-to-Channel Crosstalk
fIN = 125kHz, VIN = 2.5VP-P (Note 4)
-78
dB
Full-Linear Bandwidth
SINAD > 68dB
250
kHz
Full-Power Bandwidth
-3dB rolloff
3
MHz
Intermodulation Distortion
IMD
CONVERSION RATE
Conversion Time (Note 5)
Track/Hold Acquisition Time
tCONV
External clock mode
3.3
External acquisition/internal clock mode
2.5
3.0
3.5
Internal acquisition/internal clock mode
3.2
3.6
4.1
tACQ
625
µs
ns
Aperture Delay
External acquisition or external clock mode
50
ns
Aperture Jitter
External acquisition or external clock mode
Internal acquisition/internal clock mode
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