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MAX1295BCEI

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
General Description
The MAX1295/MAX1297 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 +2.7V to +3.6V analog supply.
Power consumption is only 5.4mW at the maximum
sampling rate of 265ksps. Two software-selectable
power-down modes enable the MAX1295/MAX1297 to
be shut down between conversions; accessing the par-
allel interface returns them to normal operation.
Powering down between conversions can reduce sup-
ply current below 10µA at lower sampling rates.
Both devices offer software-configurable analog inputs
for unipolar/bipolar and single-ended/pseudo-differen-
tial operation. In single-ended mode, the MAX1295 has
six input channels and the MAX1297 has two (three
input channels and one input channel, respectively,
when in pseudo-differential mode).
Excellent dynamic performance and low power, combined
with ease of use and small package size, make these con-
verters ideal for battery-powered and data-acquisition
applications or for other circuits with demanding power-
consumption and space requirements.
The MAX1295/MAX1297 tri-states INT when CS goes high.
Refer to MAX1265/MAX1267 if tri-stating INT is not desired.
The MAX1295 is offered in a 28-pin QSOP package, while
the MAX1297 comes in a 24-pin QSOP. For pin-compati-
ble +5V, 12-bit versions, refer to the MAX1294/MAX1296
data sheet.
Applications
Industrial Control Systems Data Logging
Energy Management Patient Monitoring
Data-Acquisition Systems Touchscreens
Features
♦ 12-Bit Resolution, ±0.5 LSB Linearity
♦ +3V Single-Supply Operation
♦ Internal +2.5V Reference
♦ Software-Configurable Analog Input Multiplexer
6-Channel Single-Ended/
3-Channel Pseudo-Differential (MAX1295)
2-Channel Single-Ended/
1-Channel Pseudo-Differential (MAX1297)
♦ Software-Configurable Unipolar/Bipolar
Analog Inputs
♦ Low Current
1.9mA (265ksps)
1.0mA (100ksps)
400µA (10ksps)
2µA (Shutdown)
♦ Internal 3MHz Full-Power Bandwidth Track/Hold
♦ Parallel 12-Bit Interface
♦ Small Footprint
28-Pin QSOP (MAX1295)
24-Pin QSOP (MAX1297)
MAX1295/MAX1297
265ksps, +3V, 6-/2-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
________________________________________________________________ Maxim Integrated Products 1
19-1530; Rev 3; 12/02
EVALUATION KIT
AVAILABLE
Ordering Information
Pin Configurations
Typical Operating Circuits appear at end of data sheet.
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
D10
D11
V
DD
REF
REFADJ
GND
CS
COM
CH0
CH1
CH2
CH3
CH4
CH5
CLK
WR
RD
INT
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
QSOP
TOP VIEW
MAX1295
Pin Configurations continued at end of data sheet.
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.
PART
TEMP RANGE
PIN-PACKAGE
INL
(LSB)
MAX1295ACEI
0°C to +70°C
28 QSOP ±0.5
MAX1295BCEI
0°C to +70°C
28 QSOP ±1
MAX1295AEEI
-40°C to +85°C
28 QSOP ±0.5
MAX1295BEEI
-40°C to +85°C
28 QSOP ±1
MAX1297ACEG
0°C to +70°C
24 QSOP ±0.5
MAX1297BCEG
0°C to +70°C
24 QSOP ±1
MAX1297AEEG
-40°C to +85°C
24 QSOP ±0.5
MAX1297BEEG
-40°C to +85°C
24 QSOP ±1
MAX1295/MAX1297
265ksps, +3V, 6-/2-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V to +3.6V, COM = GND, REFADJ = V
DD
, V
REF
= +2.5V, 4.7µF capacitor at REF pin, f
CLK
= 4.8MHz (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
MAX1295_C_ _ /MAX1297_C_ _ ........................0°C to +70°C
MAX1295_E_ _ /MAX1297_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
= 125kHz (Note 4)
f
IN1
= 49kHz, f
IN2
= 52kHz
MAX129_B
No missing codes over temperature
CONDITIONS
ns50Aperture Delay
ns625t
ACQ
Track/Hold Acquisition Time
3.2 3.6 4.1
2.5 3.0 3.5
µs
3.3
t
CONV
Conversion Time (Note 5)
MHz
3
Full-Power Bandwidth
kHz
250
Full-Linear Bandwidth
dB
-78
Channel-to-Channel Crosstalk
dB
76
IMDIntermodulation Distortion
dB
80
SFDRSpurious-Free Dynamic Range
dB
Total Harmonic Distortion
(including 5th-order harmonic)
-78
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 4.8f
CLK
External Clock Frequency
%30 70Duty Cycle
DC ACCURACY (Note 1)
DYNAMIC SPECIFICATIONS (f
IN(sine-wave)
= 50kHz, V
IN
= 2.5V
P-P
, 265ksps, external f
CLK
= 4.8MHz, bipolar input mode)
CONVERSION RATE
MAX1295/MAX1297
265ksps, +3V, 6-/2-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +3.6V, COM = GND, REFADJ = V
DD
, V
REF
= +2.5V, 4.7µF capacitor at REF pin, f
CLK
= 4.8MHz (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
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
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
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
Analog Input Voltage Range
Single-Ended and Differential
(Note 6)
0 V
REF
-V
REF
/2 +V
REF
/2
V
IN
CS = V
DD
I
SOURCE
= 1mA
I
SINK
= 1.6mA
V
IN
= 0 or V
DD
V
REF
= 2.5V, f
SAMPLE
= 265ksps
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
2.0
V
IH
Input Voltage High
µA
200 300
I
REF
REF Input Current
CS = V
DD
V
2.7 3.6
V
DD
Analog Supply Voltage
pF
15
C
OUT
Three-State Output Capacitance
Internal reference
2.5 2.8
ppm/°C
±20
TC
REF
REF Temperature Coefficient
Shutdown mode
2
External reference
1.9 2.3
0.9 1.2
Positive Supply Current
Shutdown mode
210
µA
Power-Supply Rejection PSR V
DD
= 2.7V to 3.6V, full-scale input
±0.4 ±0.9
mV
I
DD
0.5 0.8
mA
Operating mode,
f
SAMPLE
= 265ksps
Internal reference
External reference
Standby mode
CONVERSION RATE (continued)
ANALOG INPUTS
INTERNAL REFERENCE
EXTERNAL REFERENCE AT REF
DIGITAL INPUTS AND OUTPUTS
POWER REQUIREMENTS
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

MAX1295BCEI

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IC ADC 12-BIT 265KSPS 28-QSOP
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