19-1531; Rev 3; 12/02
KIT
ATION
EVALU
E
L
B
A
AVAIL
400ksps, +5V, 8-/4-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
The MAX1290/MAX1292 tri-states INT when CS goes
high. Refer to MAX1262/MAX1264 if tri-stating INT is not
desired.
The MAX1290 is available in a 28-pin QSOP package,
while the MAX1292 comes in a 24-pin QSOP. For pincompatible +3V, 12-bit versions, refer to the MAX1291/
MAX1293 data sheet.
Applications
Industrial Control Systems
Energy Management
Data-Acquisition Systems
Data Logging
Patient Monitoring
Touchscreens
Ordering Information
PART
MAX1290ACEI
TEMP RANGE
PIN-PACKAGE
INL
(LSB)
0°C to +70°C
28 QSOP
±0.5
MAX1290BCEI
0°C to +70°C
28 QSOP
±1
MAX1290AEEI
-40°C to +85°C
28 QSOP
±0.5
MAX1290BEEI
-40°C to +85°C
28 QSOP
±1
Ordering Information continued at end of data sheet.
Features
♦ 12-Bit Resolution, ±0.5 LSB Linearity
♦ +5V Single-Supply Operation
♦ User-Adjustable Logic Level (+2.7V to +5.5V)
♦ Internal +2.5V Reference
♦ Software-Configurable Analog Input Multiplexer
8-Channel Single-Ended/
4-Channel Pseudo-Differential (MAX1290)
4-Channel Single-Ended/
2-Channel Pseudo-Differential (MAX1292)
♦ Software-Configurable Unipolar/Bipolar Analog
Inputs
♦ Low Current: 2.5mA (400ksps)
1.0mA (100ksps)
400µA (10ksps)
2µA (Shutdown)
♦ Internal 6MHz Full-Power Bandwidth Track/Hold
♦ Byte-Wide Parallel (8 + 4) Interface
♦ Small Footprint: 28-Pin QSOP (MAX1290)
24-Pin QSOP (MAX1292)
Pin Configurations
TOP VIEW
HBEN 1
24 VLOGIC
D7 2
23 VDD
D6 3
22 REF
D5 4
21 REFADJ
D4 5
D3/D11 6
20 GND
MAX1292
19 COM
D2/D10 7
18 CH0
D1/D9 8
17 CH1
D0/D8 9
16 CH2
INT 10
15 CH3
RD 11
14 CS
WR 12
13 CLK
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
MAX1290/MAX1292
General Description
The MAX1290/MAX1292 low-power, 12-bit analog-todigital converters (ADCs) feature a successive-approximation ADC, automatic power-down, fast wake-up
(2µs), an on-chip clock, +2.5V internal reference, and
a high-speed, byte-wide parallel interface. The devices
operate with a single +5V analog supply and feature a
VLOGIC pin that allows them to interface directly with a
+2.7V to +5.5V digital supply.
Power consumption is only 10mW (VDD = VLOGIC) at a
400ksps max sampling rate. Two software-selectable
power-down modes enable the MAX1290/MAX1292 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 MAX1290 has
eight input channels and the MAX1292 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.
MAX1290/MAX1292
400ksps, +5V, 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
MAX1290_C_ _/MAX1292_C_ _ ....................... 0°C to +70°C
MAX1290_E_ _/MAX1292_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 = +5V ±10%, COM = GND, REFADJ = VDD, VREF = +2.5V, 4.7µF capacitor at REF pin, fCLK = 7.6MHz (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
12
RES
Bits
MAX129_A
±0.5
MAX129_B
±1
No missing codes over temperature
±1
LSB
Offset Error
±4
LSB
Gain Error (Note 3)
±4
Relative Accuracy (Note 2)
INL
Differential Nonlinearity
DNL
Gain Temperature Coefficient
Channel-to-Channel Offset
Matching
LSB
LSB
±2
ppm/°C
±0.2
LSB
DYNAMIC SPECIFICATIONS (fIN(sine wave) = 50kHz, VIN = 2.5VP-P, 400ksps, external fCLK = 7.6MHz, 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
-80
80
dB
dB
fIN1 = 49kHz, fIN2 = 52kHz
76
dB
Channel-to-Channel Crosstalk
fIN = 175kHz, VIN = 2.5VP-P (Note 4)
-78
dB
Full-Linear Bandwidth
SINAD > 68dB
350
kHz
Full-Power Bandwidth
-3dB rolloff
6
MHz
Intermodulation Distortion
IMD
CONVERSION RATE
Conversion Time (Note 5)
T/H Acquisition Time
tCONV
Aperture Jitter
Duty Cycle
2
2.1
External acquisition/internal clock mode
2.5
3.0
3.5
Internal acquisition/internal clock mode
3.2
3.6
4
tACQ
Aperture Delay
External Clock Frequency
External clock mode
fCLK
400
External acquisition or external clock mode
25
External acquisition or external clock mode
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