MAX1295 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – 265ksps, +3V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface

19-1530; Rev 0; 9/99
EVAALVUAAILTAIOBNLEKIT _{265ksps, +3V, 6-/2-Channel, 12-Bit ADCs}
with +2.5V Reference and Parallel Interface
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), on-chip clock, +2.5V internal reference, and
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 is
offered in a 28-pin QSOP package, while the MAX1297
comes in a 24-pin QSOP. For pin-compatible +5V, 12-bit
versions, refer to the MAX1294/MAX1296 data sheet.
Industrial Control Systems
Energy Management
Data-Acquisition Systems
Applications
Data Logging
Patient Monitoring
Touchscreens
Ordering Information
PART
TEMP. RANGE
MAX1295ACEI 0°C to +70°C
MAX1295BCEI 0°C to +70°C
MAX1295AEEI -40°C to +85°C
MAX1295BEEI -40°C to +85°C
MAX1297ACEG 0°C to +70°C
MAX1297BCEG 0°C to +70°C
MAX1297AEEG -40°C to +85°C
MAX1297BEEG -40°C to +85°C
PIN-PACKAGE
28 QSOP
28 QSOP
28 QSOP
28 QSOP
24 QSOP
24 QSOP
24 QSOP
24 QSOP
INL
(LSB)
±0.5
±1
±0.5
±1
±0.5
±1
±0.5
±1
Features
o 12-Bit Resolution, ±0.5LSB Linearity
o +3V Single-Supply Operation
o Internal +2.5V Reference
o Software-Configurable Analog Input Multiplexer
6-Channel Single-Ended/
3-Channel Pseudo-Differential (MAX1295)
2-Channel Single-Ended/
1-Channel Pseudo-Differential (MAX1297)
o Software-Configurable Unipolar/Bipolar
Analog Inputs
o Low Current
1.8mA (265ksps)
1.0mA (100ksps)
400µA (10ksps)
2µA (shutdown)
o Internal 3MHz Full-Power Bandwidth Track/Hold
o Parallel 12-Bit Interface
o Small Footprint
28-Pin QSOP (MAX1295)
24-Pin QSOP (MAX1297)
Pin Configurations
TOP VIEW
D9 1
D8 2
D7 3
D6 4
D5 5
D4 6
D3 7
D2 8
D1 9
D0 10
INT 11
RD 12
WR 13
CLK 14
MAX1295
28 D10
27 D11
26 V_DD
25 REF
24 REFADJ
23 GND
22 COM
21 CH0
20 CH1
19 CH2
18 CH3
17 CH4
16 CH5
15 CS
QSOP
Pin Configurations continued at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
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