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MAX1294BCEI+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
General Description
The MAX1294/MAX1296 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 12-bit parallel interface. They operate with
a single +5V analog supply.
Power consumption is only 10mW at the maximum sam-
pling rate of 420ksps. Two software-selectable power-
down modes enable the MAX1294/MAX1296 to be shut
down between conversions; accessing the parallel
interface returns them to normal operation. Powering
down between conversions can reduce supply below
10µA at lower sampling rates.
Both devices offer software-configurable analog inputs for
unipolar/bipolar and single-ended/pseudo-differential
operation. In single-ended mode, the MAX1294 has six
input channels and the MAX1296 has two (three input
channels and one input channel, 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 MAX1294/MAX1296 tri-states INT when CS goes
high. Refer to MAX1266/MAX1268 if tri-stating INT is not
desired.
The MAX1294 is offered in a 28-pin QSOP package, while
the MAX1296 is available in a 24-pin QSOP. For pin-com-
patible +3V, 12-bit versions, see the MAX1295/MAX1297.
Applications
Industrial Control Systems Data Logging
Energy Management Patient Monitoring
Data-Acquisition Systems Touchscreens
Features
♦ 12-Bit Resolution, ±0.5 LSB Linearity
♦ Single +5V Operation
♦ Internal +2.5V Reference
♦ Software-Configurable Analog Input Multiplexer
6-Channel Single-Ended/
3-Channel Pseudo-Differential (MAX1294)
2-Channel Single-Ended/
1-Channel Pseudo-Differential (MAX1296)
♦ Software-Configurable Unipolar/Bipolar
Analog Inputs
♦ Low Current
2.8mA (420ksps)
1.0mA (100ksps)
400µA (10ksps)
2µA (Shutdown)
♦ Internal 6MHz Full-Power Bandwidth Track/Hold
♦ Parallel 12-Bit Interface
♦ Small Footprint
28-Pin QSOP (MAX1294)
24-Pin QSOP (MAX1296)
MAX1294/MAX1296
420ksps, +5V, 6-/2-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
________________________________________________________________ Maxim Integrated Products 1
19-1533; Rev 2; 12/02
PART
MAX1294ACEI
MAX1294BCEI 0°C to +70°C
0°C to +70°C
TEMP RANGE PIN-PACKAGE
28 QSOP
28 QSOP
Ordering Information
Pin Configurations
INL
(LSB)
±0.5
±1
Typical Operating Circuits appear at end of data sheet.
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
D10
D11
V
DD
REF
REFADJ
GND
COM
CH0
CH1
CS
CLK
WRRD
INT
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
QSOP
TOP VIEW
MAX1296
Pin Configurations continued at end of data sheet.
MAX1294AEEI -40°C to +85°C 28 QSOP ±0.5
MAX1294BEEI -40°C to +85°C 28 QSOP ±1
EVALUATION KIT
AVAILABLE
MAX1296ACEG
MAX1296BCEG
MAX1296AEEG -40°C to +85°C
0°C to +70°C
0°C to +70°C 24 QSOP
24 QSOP
24 QSOP ±0.5
MAX1296BEEG -40°C to +85°C 24 QSOP ±1
±0.5
±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.
MAX1294/MAX1296
420ksps, +5V, 6-/2-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= +5V ±10%, COM = GND, REFADJ = V
DD
, V
REF
= +2.5V, 4.7µF capacitor at REF pin, f
CLK
= 7.6MHz (50% duty cycle),
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°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.
V
DD
to GND..............................................................-0.3V to +6V
CH0–CH5, COM to GND............................-0.3V to (V
DD
+ 0.3V)
REF, REFADJ to GND.................................-0.3V to (V
DD
+ 0.3V)
Digital Inputs to GND ...............................................-0.3V to +6V
Digital Outputs (D0–D11, INT) to GND.......-0.3V to (V
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +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
MAX1294_C_ _/MAX1296_C_ _.........................0°C to +70°C
MAX1294_E_ _/MAX1296_E_ _ ......................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
External acquisition or external clock mode
Internal acquisition/internal clock mode
MAX129_A
External acquisition/internal clock mode
External clock mode
-3dB rolloff
SINAD > 68dB
f
IN
= 175kHz (Note 4)
f
IN1
= 49kHz, f
IN2
= 52kHz
MAX129_B
No missing codes over temperature
CONDITIONS
ns25Aperture Delay
ns400t
ACQ
T/H Acquisition Time
3.2 3.6 4
2.5 3.0 3.5
µs
2.1
t
CONV
Conversion Time (Note 5)
MHz
6
Full-Power Bandwidth
kHz
350
Full-Linear Bandwidth
dB
-78
Channel-to-Channel Crosstalk
dB
76
IMDIntermodulation Distortion
dB
-80
SFDRSpurious-Free Dynamic Range
Total Harmonic Distortion
(including 5th-order harmonic)
dB
-80
THD
±0.5
INLRelative Accuracy (Note 2)
Bits
12
RESResolution
dB
67 70
SINADSignal-to-Noise Plus Distortion
LSB
±0.2
Channel-to-Channel Offset
Matching
ppm/°C
±2.0
Gain Temperature Coefficient
LSB
±1
LSB
±1
DNLDifferential Nonlinearity
LSB
±4
Offset Error
LSB
±4
Gain Error (Note 3)
UNITSMIN TYP MAXSYMBOLPARAMETER
Internal acquisition/internal clock mode
External acquisition or external clock mode
<200
ps
<50
Aperture Jitter
MHz0.1 7.6f
CLK
External Clock Frequency
%30 70Duty Cycle
DC ACCURACY (Note 1)
DYNAMIC SPECIFICATIONS (f
IN(sine wave)
= 50kHz, V
IN
= 2.5V
P-P
, 420ksps, external f
CLK
= 7.6MHz, bipolar input mode)
CONVERSION RATE
I
DD
MAX1294/MAX1296
420ksps, +5V, 6-/2-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V ±10%, COM = GND, REFADJ = V
DD
, V
REF
= +2.5V, 4.7µF capacitor at REF pin, f
CLK
= 7.6MHz (50% duty cycle),
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER
Shutdown mode
V
REF
= 2.5V, f
SAMPLE
= 420ksps
0 to 0.5mA output load
To power down the internal reference
For small adjustments
On/off-leakage current, V
IN
= 0 or V
DD
Unipolar, V
COM
= 0
Bipolar, V
COM
= V
REF
/ 2
2
µA
200 300
I
REF
V
1.0
V
DD
+
50mV
V
REF
REF Input Voltage Range
µF
4.7 10
Capacitive Bypass at REF
µF
0.01 1
Capacitive Bypass at REFADJ
mV/mA
0.2
Load Regulation (Note 7)
V
V
DD
- 1
REFADJ High Threshold
mV
±100
REFADJ Input Range
ppm/°C
±20
TC
REF
REF Temperature Coefficient
mA
15
REF Short-Circuit Current
V
2.49 2.5 2.51
REF Output Voltage
pF
12
C
IN
Input Capacitance
µA
±0.01 ±1
Multiplexer Leakage Current
V
0 V
REF
V
IN
Analog Input Voltage Range
Single-Ended and Differential
(Note 6)
-V
REF
/2 +V
REF
/2
CS = V
DD
I
SOURCE
= 1mA
I
SINK
= 1.6mA
V
IN
= 0 or V
DD
µA
±0.1 ±1
I
LEAKAGE
Three-State Leakage Current
V
V
DD
- 0.5
V
OH
Output Voltage High
V
0.4
V
OL
Output Voltage Low
pF
15
C
IN
Input Capacitance
µA
±0.1 ±1
I
IN
Input Leakage Current
mV
200
V
HYS
Input Hysteresis
V
0.8
V
IL
Input Voltage Low
V
4.0
V
IH
Input Voltage High
CS = V
DD
V
4.5 5.5
V
DD
Analog Supply Voltage
pF
15
C
OUT
Three-State Output Capacitance
3.3 3.6
REF Input Current
µA
External reference
2.8 3.1
External reference
0.5 0.8
mA
Internal reference
1.0 1.2
Power-Supply Rejection PSR V
DD
= 5V ±10%, full-scale input
±0.3 ±0.9
mV
Positive Supply Current I
DD
Shutdown mode
210
µA
ANALOG INPUTS
INTERNAL REFERENCE
EXTERNAL REFERENCE AT REF
DIGITAL INPUTS AND OUTPUTS
POWER REQUIREMENTS
Internal reference
Operating mode,
f
SAMPLE
= 420ksps
Standby mode
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

MAX1294BCEI+T

Mfr. #:
Buy MAX1294BCEI+T
Manufacturer:
Maxim Integrated
Description:
Analog to Digital Converters - ADC 12-Bit 6Ch 420ksps 5.5V Precision ADC
Lifecycle:
New from this manufacturer.
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