MAX1295ACEI+ Maxim Integrated Products, MAX1295ACEI+ Datasheet

IC ADC 12BIT 265KSPS 28-QSOP

MAX1295ACEI+

Manufacturer Part Number
MAX1295ACEI+
Description
IC ADC 12BIT 265KSPS 28-QSOP
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1297BEEG.pdf (19 pages)

Specifications of MAX1295ACEI+

Number Of Bits
12
Sampling Rate (per Second)
265k
Data Interface
Parallel
Number Of Converters
1
Power Dissipation (max)
762mW
Voltage Supply Source
Single Supply
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
28-QSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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.
19-1530; Rev 3; 12/02
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.
MAX1295ACEI
MAX1295BCEI
MAX1295AEEI
MAX1295BEEI
MAX1297ACEG
MAX1297BCEG
MAX1297AEEG -40°C to +85°C
MAX1297BEEG -40°C to +85°C
Industrial Control Systems
Energy Management
Data-Acquisition Systems
PART
with +2.5V Reference and Parallel Interface
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
________________________________________________________________ Maxim Integrated Products
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
Ordering Information
265ksps, +3V, 6-/2-Channel, 12-Bit ADCs
General Description
PIN-PACKAGE
Data Logging
Patient Monitoring
Touchscreens
28 QSOP
28 QSOP
28 QSOP
28 QSOP
24 QSOP
24 QSOP
24 QSOP
24 QSOP
Applications
(LSB)
±0.5
±1
±0.5
±1
±0.5
±1
±0.5
±1
INL
♦ 12-Bit Resolution, ±0.5 LSB Linearity
♦ +3V Single-Supply Operation
♦ Internal +2.5V Reference
♦ Software-Configurable Analog Input Multiplexer
♦ Software-Configurable Unipolar/Bipolar
♦ Low Current
♦ Internal 3MHz Full-Power Bandwidth Track/Hold
♦ Parallel 12-Bit Interface
♦ Small Footprint
Typical Operating Circuits appear at end of data sheet.
Pin Configurations continued at end of data sheet.
Analog Inputs
TOP VIEW
6-Channel Single-Ended/
3-Channel Pseudo-Differential (MAX1295)
2-Channel Single-Ended/
1-Channel Pseudo-Differential (MAX1297)
1.9mA (265ksps)
1.0mA (100ksps)
400µA (10ksps)
2µA (Shutdown)
28-Pin QSOP (MAX1295)
24-Pin QSOP (MAX1297)
CLK
INT
WR
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
RD
10
11
12
13
14
1
2
3
4
5
6
7
8
9
MAX1295
QSOP
Pin Configurations
28
27
26
25
24
23
22
21
20
19
18
17
16
15
D10
D11
V
REF
REFADJ
GND
COM
CH0
CH1
CH2
CH3
CH4
CH5
CS
DD
Features
1

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MAX1295ACEI+ Summary of contents

Page 1

... MAX1297BCEG 0°C to +70°C MAX1297AEEG -40°C to +85°C MAX1297BEEG -40°C to +85°C ________________________________________________________________ Maxim Integrated Products 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. ♦ 12-Bit Resolution, ±0.5 LSB Linearity ♦ +3V Single-Supply Operation ♦ ...

Page 2

ADCs with +2.5V Reference and Parallel Interface ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V DD CH0–CH5, COM to GND ............................-0. REF, REFADJ to GND.................................-0. Digital Inputs to GND ...............................................-0.3V to ...

Page 3

ADCs with +2.5V Reference and Parallel Interface ELECTRICAL CHARACTERISTICS (continued +2.7V to +3.6V, COM = GND, REFADJ = unless otherwise noted. Typical values are at T ...

Page 4

ADCs with +2.5V Reference and Parallel Interface TIMING CHARACTERISTICS (V = +2.7V to +3.6V, COM = GND, REFADJ = unless otherwise noted. Typical values are ...

Page 5

ADCs with +2.5V Reference and Parallel Interface (V = +3V +2.500V 4.8MHz REF CLK INTEGRAL NONLINEARITY vs. DIGITAL OUTPUT CODE 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 ...

Page 6

ADCs with +2.5V Reference and Parallel Interface (V = +3V +2.500V 4.8MHz REF CLK INTERNAL REFERENCE VOLTAGE vs. SUPPLY VOLTAGE 2.53 2.52 2.51 2.50 2.49 2.48 3.0 3.3 2.7 3.6 ...

Page 7

ADCs with +2.5V Reference and Parallel Interface PIN NAME MAX1295 MAX1297 ...

Page 8

ADCs with +2.5V Reference and Parallel Interface PIN NAME MAX1295 MAX1297 25 21 REF D11 28 24 D10 (CH5) (CH4) ANALOG INPUT (CH3) MULTIPLEXER (CH2) CH1 CH0 COM CLK CLOCK ...

Page 9

ADCs with +2.5V Reference and Parallel Interface the analog inputs. This configuration is pseudo-differ- ential in that only the signal at IN+ is sampled. The return side (IN-) must remain stable within ±0.5 LSB (±0.1 LSB ...

Page 10

ADCs with +2.5V Reference and Parallel Interface Table 2. Channel Selection for Single-Ended Operation *Channels ...

Page 11

ADCs with +2.5V Reference and Parallel Interface CSWS CONTROL D7–D0 BYTE ACQMOD = "0" HIGH-Z INT RD HIGH-Z DOUT Figure 4. Conversion Timing Using Internal Acquisition Mode ...

Page 12

ADCs with +2.5V Reference and Parallel Interface CSWS CONTROL D7–D0 BYTE ACQMOD = "1" HIGH-Z INT RD HIGH-Z DOUT Figure 5. Conversion Timing Using External Acquisition Mode ...

Page 13

ADCs with +2.5V Reference and Parallel Interface CLK t CWS WR ACQMOD = "0" t ACQUISITION STARTS CWH CLK WR ACQMOD = "0" WR Timing (Internal Acquisition Mode) Figure 6a. External Clock and ACQUISITION STARTS CLK ...

Page 14

ADCs with +2.5V Reference and Parallel Interface Table 4. Control-Byte Format D7 D6 (MSB) PD1 PD0 ACQMOD V = +3V DD 50kΩ 330kΩ 50kΩ GND 0.01µF 4.7µF GND Figure 7. Reference Adjustment with External Potentiometer the ...

Page 15

ADCs with +2.5V Reference and Parallel Interface Table 5. Full-Scale and Zero-Scale for Unipolar and Bipolar Operation UNIPOLAR MODE Zero Scale Full Scale OUTPUT CODE FULL-SCALE TRANSITION FS = REF + COM 111 . . . ...

Page 16

ADCs with +2.5V Reference and Parallel Interface ; ; ; ; CLK WR RD CONTROL D11– D7–D0 WORD D0 STATE ACQUISITION SAMPLING INSTANT Figure 10. Timing Diagram for Fastest Conversion SUPPLIES ...

Page 17

ADCs with +2.5V Reference and Parallel Interface Integral Nonlinearity Integral nonlinearity (INL) is the deviation of the values on an actual transfer function from a straight line. This straight line can be either a best-straight-line fit ...

Page 18

ADCs with +2.5V Reference and Parallel Interface CLK MAX1295 REF µP WR REFADJ CONTROL INPUTS RD INT D11 D10 CH5 D6 CH4 D5 CH3 D4 CH2 D3 CH1 D2 CH0 ...

Page 19

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________19 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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