MAX1268BCEG-T Maxim Integrated, MAX1268BCEG-T Datasheet

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MAX1268BCEG-T

Manufacturer Part Number
MAX1268BCEG-T
Description
Analog to Digital Converters - ADC
Manufacturer
Maxim Integrated
Datasheet
1.MAX1266AEEI.pdf (19 pages)

Specifications of MAX1268BCEG-T

Number Of Channels
2/1
Architecture
SAR
Conversion Rate
420 KSPs
Resolution
12 bit
Input Type
Single-Ended/Pseudo-Differential
Snr
70 dB
Interface Type
Parallel
Operating Supply Voltage
4.5 V to 5.5 V
Maximum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
Package / Case
QSOP-24
Maximum Power Dissipation
762 mW
Minimum Operating Temperature
0 C
Number Of Converters
1
Voltage Reference
2.5 V
The MAX1266/MAX1268 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 MAX1266/MAX1268 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 MAX1266 has six
input channels and the MAX1268 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
MAX1266 is offered in a 28-pin QSOP package, while the
MAX1268 is available in a 24-pin QSOP. For pin-compati-
ble +3V, 12-bit versions, see the MAX1265/MAX1267.
19-2722; Rev 0; 04/03
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.
MAX1266ACEI
MAX1266BCEI
MAX1266AEEI
MAX1266BEEI
MAX1268ACEG
MAX1268BCEG
MAX1268AEEG -40°C to +85°C
MAX1268BEEG -40°C to +85°C
Industrial Control Systems
Energy Management
Data-Acquisition Systems
PART
-40°C to +85°C
-40°C to +85°C
with +2.5V Reference and Parallel Interface
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
General Description
420ksps, +5V, 6-/2-Channel, 12-Bit ADCs
PIN-PACKAGE
28 QSOP
28 QSOP
28 QSOP
28 QSOP
24 QSOP
24 QSOP
24 QSOP
24 QSOP
Data Logging
Patient Monitoring
Touch Screens
Applications
(LSB)
±0.5
±0.5
±0.5
±0.5
INL
±1
±1
±1
±1
o 12-Bit Resolution, ±0.5 LSB Linearity
o Single +5V Operation
o Internal +2.5V Reference
o Software-Configurable Analog Input Multiplexer
o Software-Configurable Unipolar/Bipolar
o Low Current
o Internal 6MHz Full-Power Bandwidth Track/Hold
o Parallel 12-Bit Interface
o 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 (MAX1266)
2-Channel Single Ended/
1-Channel Pseudo-Differential (MAX1268)
2.8mA (420ksps)
1.0mA (100ksps)
400µA (10ksps)
2µA (Shutdown)
28-Pin QSOP (MAX1266)
24-Pin QSOP (MAX1268)
INT
RD
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
10
11
12
1
2
3
4
5
6
7
8
9
MAX1268
QSOP
Pin Configurations
24
23
22
21
20
19
18
17
16
15
14
13
D10
D11
V
REF
REFADJ
GND
COM
CH0
CH1
CS
CLK
WR
DD
Features
1

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MAX1268BCEG-T Summary of contents

Page 1

... QSOP MAX1266BEEI -40°C to +85°C 28 QSOP MAX1268ACEG 0°C to +70°C 24 QSOP MAX1268BCEG 0°C to +70°C 24 QSOP MAX1268AEEG -40°C to +85°C 24 QSOP MAX1268BEEG -40°C to +85°C 24 QSOP ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’ ...

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 +5V ±10%, COM = GND, REFADJ = unless otherwise noted. Typical values are ...

Page 4

ADCs with +2.5V Reference and Parallel Interface TIMING CHARACTERISTICS (V = +5V ±10%, COM = GND, REFADJ = unless otherwise noted. Typical values are MIN ...

Page 5

ADCs with +2.5V Reference and Parallel Interface (V = +5V +2.500V 7.6MHz 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 = +5V +2.500V 7.6MHz REF CLK INTERNAL REFERENCE VOLTAGE vs. SUPPLY VOLTAGE 2.53 2.52 2.51 2.50 2.49 2.48 4.50 4.75 5.00 5.25 ...

Page 7

ADCs with +2.5V Reference and Parallel Interface PIN NAME MAX1266 MAX1268 ...

Page 8

ADCs with +2.5V Reference and Parallel Interface PIN NAME MAX1266 MAX1268 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 Single-Ended and Pseudo-Differential Operation The sampling architecture of the ADC’s analog com- parator is illustrated in the equivalent input circuits of Figure 3. In single-ended mode, IN+ is internally ...

Page 10

ADCs with +2.5V Reference and Parallel Interface Table 2. Channel Selection for Single-Ended Operation (SGL/DIF = ...

Page 11

ADCs with +2.5V Reference and Parallel Interface the acquisition time lengthens and more time must be allowed between conversions. The acquisition time the maximum time the device takes to acquire ACQ the signal, ...

Page 12

ADCs with +2.5V Reference and Parallel Interface CSWS CONTROL D11–D0 BYTE ACQMOD = 0 INT RD HIGH-Z DOUT Figure 4. Conversion Timing Using Internal Acquisition Mode t ...

Page 13

ADCs with +2.5V Reference and Parallel Interface External Clock Mode To select external clock mode, bits D6 and D7 of the control byte must be set to 1. Figure 6 shows the clock and WR timing ...

Page 14

ADCs with +2.5V Reference and Parallel Interface Table 4. Control-Byte Format (MSB) PD1 PD0 ACQMOD The control bit sequence is latched into the device on pins D7–D0 during a write command. Table 4 ...

Page 15

ADCs with +2.5V Reference and Parallel Interface Table 5. Full Scale and Zero Scale for Unipolar and Bipolar Operation UNIPOLAR MODE Full scale Zero 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 ACQUISITION STATE SAMPLING INSTANT Figure 10. Timing Diagram for Fastest Conversion tion or conversion can cause ...

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 MAX1266 REF µP CONTROL WR REFADJ 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 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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