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MAX1290AEEI

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
General Description
The MAX1290/MAX1292 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. The devices
operate with a single +5V analog supply and feature a
V
LOGIC
pin that allows them to interface directly with a
+2.7V to +5.5V digital supply.
Power consumption is only 10mW (V
DD
= V
LOGIC
) at a
400ksps max sampling rate. Two software-selectable
power-down modes enable the MAX1290/MAX1292 to
be shut down between conversions; accessing the par-
allel 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 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, 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 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 pin-
compatible +3V, 12-bit versions, refer to the MAX1291/
MAX1293 data sheet.
Applications
Industrial Control Systems Data Logging
Energy Management Patient Monitoring
Data-Acquisition Systems Touchscreens
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)
MAX1290/MAX1292
400ksps, +5V, 8-/4-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
________________________________________________________________ Maxim Integrated Products 1
19-1531; Rev 3; 12/02
PART
MAX1290ACEI
0°C to +70°C
TEMP RANGE PIN-PACKAGE
28 QSOP
Ordering Information
Pin Configurations
±0.5
INL
(LSB)
MAX1290BCEI 0°C to +70°C ±128 QSOP
MAX1290BEEI
MAX1290AEEI
-40°C to +85°C ±1
-40°C to +85°C ±0.528 QSOP
28 QSOP
Ordering Information continued at end of data sheet.
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
V
LOGIC
V
DD
REF
REFADJ
GND
COM
CH0
CH1
CH2
CH3
CS
CLKWR
RD
INT
D0/D8
D1/D9
D2/D10
D3/D11
D4
D5
D6
D7
HBEN
QSOP
MAX1292
TOP VIEW
Pin Configurations continued at end of data sheet.
EVALUATION KIT
AVAILABLE
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.
MAX1290/MAX1292
400ksps, +5V, 8-/4-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= V
LOGIC
= +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.
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, V
IN
= 2.5V
P-P
(Note 4)
f
IN1
= 49kHz, f
IN2
= 52kHz
MAX129_B
No missing codes over temperature
CONDITIONS
ns25Aperture Delay
ns400t
ACQ
T/H Acquisition Time
µs
3.2 3.6 4
2.5 3.0 3.5
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
dB
-80
Total Harmonic Distortion
(including 5th-order harmonic)
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
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
, 400ksps, external f
CLK
= 7.6MHz, bipolar input mode)
CONVERSION RATE
V
DD
to GND..............................................................-0.3V to +6V
V
LOGIC
to GND.........................................................-0.3V to +6V
CH0–CH7, 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
LOGIC
+ 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
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
V
MAX1290/MAX1292
400ksps, +5V, 8-/4-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= V
LOGIC
= +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
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
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
±20 ppm/°CTC
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
Analog Input Voltage Range
Single Ended and Differential
(Note 6)
0V
REF
V
IN
CS = V
DD
I
SOURCE
= 1mA
I
SINK
= 1.6mA
V
IN
= 0 or V
DD
V
LOGIC
= 4.5V
µA
±0.1 ±1
I
LEAKAGE
Three-State Leakage Current
V
V
LOGIC
- 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
CS = V
DD
pF
15
C
OUT
Three-State Output Capacitance
Bipolar, V
COM
= V
REF
/ 2
-V
REF
/2 +V
REF
/2
V
LOGIC
= 2.7V
2.0
V
IH
Input Voltage High
V
REF
= 2.5V, f
SAMPLE
= 400ksps
200 300
Shutdown mode
µA
2
I
REF
Shutdown REF Input Current
ANALOG INPUTS
INTERNAL REFERENCE
EXTERNAL REFERENCE AT REF
DIGITAL INPUTS AND OUTPUTS
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

MAX1290AEEI

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IC ADC 12BIT 8CH 337KSPS 28-QSOP
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