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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1261 Datasheet

12-Bit ADC

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19-2719; Rev 0; 04/03
250ksps, +3V, 8-/4-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
General Description
The MAX1261/MAX1263 low-power, 12-bit analog-to-
digital converters (ADCs) feature a successive-approxi-
mation ADC, automatic power-down, fast wake-up
(2µs), an on-chip clock, +2.5V internal reference, and a
high-speed, 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 MAX1261/
MAX1263 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-differen-
tial operation. In single-ended mode, the MAX1261 has
eight input channels and the MAX1263 has four input
channels (four and two input channels, respectively,
when in pseudo-differential mode).
Excellent dynamic performance and low power, com-
bined with ease of use and small package size, make
these converters ideal for battery-powered and data-
acquisition applications or for other circuits with demand-
ing power consumption and space requirements.
The MAX1261 is available in a 28-pin QSOP package,
while the MAX1263 is available in a 24-pin QSOP. For
pin-compatible +5V, 12-bit versions, refer to the
MAX1262/MAX1264 data sheet.
Industrial Control Systems
Energy Management
Data-Acquisition Systems
Applications
Data Logging
Patient Monitoring
Touch Screens
Ordering Information
PART
MAX1261ACEI
MAX1261BCEI
MAX1261AEEI
MAX1261BEEI
TEMP RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QSOP
28 QSOP
28 QSOP
28 QSOP
INL
(LSB)
±0.5
±1
±0.5
±1
Ordering Information continued at end of data sheet.
Features
o 12-Bit Resolution, ±0.5 LSB Linearity
o +3V Single Operation
o User-Adjustable Logic Level (+1.8V to +3.6V)
o Internal +2.5V Reference
o Software-Configurable, Analog Input Multiplexer
8-Channel Single Ended/
4-Channel Pseudo-Differential (MAX1261)
4-Channel Single Ended/
2-Channel Pseudo-Differential (MAX1263)
o Software-Configurable, Unipolar/Bipolar Inputs
o Low Power
1.9mA (250ksps)
1.0mA (100ksps)
400µA (10ksps)
2µA (Shutdown)
o Internal 3MHz Full-Power Bandwidth Track/Hold
o Byte-Wide Parallel (8 + 4) Interface
o Small Footprint
28-Pin QSOP (MAX1261)
24-Pin QSOP (MAX1263)
Pin Configurations
TOP VIEW
HBEN 1
D7 2
D6 3
D5 4
D4 5
D3/D11 6
D2/D10 7
D1/D9 8
D0/D8 9
INT 10
RD 11
WR 12
CLK 13
CS 14
MAX1261
28 VLOGIC
27 VDD
26 REF
25 REFADJ
24 GND
23 COM
22 CH0
21 CH1
20 CH2
19 CH3
18 CH4
17 CH5
16 CH6
15 CH7
QSOP
Pin Configurations continued at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1261 Datasheet

12-Bit ADC

No Preview Available !

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 8.0mW/°C above +70°C) ..........667mW
Operating Temperature Ranges
MAX1261_C_ _/MAX1263_C_ _ ..........................0°C to +70°C
MAX1261_E_ _/MAX1263_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
DC ACCURACY (Note 1)
Resolution
SYMBOL
RES
CONDITIONS
MIN TYP MAX UNITS
12 Bits
Relative Accuracy (Note 2)
Differential Nonlinearity
Offset Error
Gain Error
Gain Temperature Coefficient
INL
DNL
MAX126_A
MAX126_B
No missing codes overtemperature
(Note 3)
±2.0
±0.5
±1
±1
±4
±4
LSB
LSB
LSB
LSB
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
67 70
dB
Total Harmonic Distortion
(Including 5th-Order Harmonic)
THD
-78 dB
Spurious-Free Dynamic Range SFDR
80 dB
Intermodulation Distortion
Channel-to-Channel Crosstalk
Full-Linear Bandwidth
Full-Power Bandwidth
CONVERSION RATE
Conversion Time (Note 5)
Track/Hold Acquisition Time
Aperture Delay
Aperture Jitter
External Clock Frequency
Duty Cycle
IMD fIN1 = 49kHz, fIN2 = 52kHz
fIN = 125kHz, VIN = 2.5VP-P (Note 4)
SINAD > 68dB
-3dB rolloff
tCONV
tACQ
fCLK
External clock mode
External acquisition/internal clock mode
Internal acquisition/internal clock mode
External acquisition or external clock mode
External acquisition or external clock mode
Internal acquisition/internal clock mode
76 dB
-78 dB
250 kHz
3 MHz
3.3
2.5 3.0 3.5 µs
3.2 3.6 4.1
625 ns
50 ns
<50
<200
ps
0.1 4.8 MHz
30 70 %
2 _______________________________________________________________________________________


Part Number MAX1261
Description 12-Bit ADC
Maker Maxim Integrated
PDF Download

MAX1261 Datasheet PDF






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