MAX1261ACEI Maxim Integrated, MAX1261ACEI Datasheet

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MAX1261ACEI

Manufacturer Part Number
MAX1261ACEI
Description
Analog to Digital Converters - ADC
Manufacturer
Maxim Integrated
Datasheet

Specifications of MAX1261ACEI

Number Of Channels
8/4
Architecture
SAR
Conversion Rate
250 KSPs
Resolution
12 bit
Input Type
Single-Ended/Pseudo-Differential
Snr
70 dB
Interface Type
Parallel
Operating Supply Voltage
2.7 V to 3.6 V
Maximum Operating Temperature
+ 70 C
Package / Case
QSOP-28
Maximum Power Dissipation
667 mW
Minimum Operating Temperature
0 C
Number Of Converters
1
Voltage Reference
2.5 V
The MAX1261/MAX1263 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. They operate
with a single +3V analog supply and feature a V
pin that allows them to interface directly with a +1.8V to
+5.5V digital supply.
Power consumption is only 5.7mW (V
the maximum sampling rate of 250ksps. Two software-
selectable power-down modes enable the MAX1261/
MAX1263 to be shut down between conversions;
accessing the parallel 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 MAX1261 has
eight input channels and the MAX1263 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 MAX1261 is available in a 28-pin QSOP package,
while the MAX1263 is available in a 24-pin QSOP. For
pin-compatible +5V, 12-bit versions, refer to the
MAX1262/MAX1264 data sheet.
19-2719; Rev 0; 04/03
Ordering Information 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.
MAX1261ACEI
MAX1261BCEI
MAX1261AEEI
MAX1261BEEI
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
250ksps, +3V, 8-/4-Channel, 12-Bit ADCs
Ordering Information
General Description
PIN-PACKAGE
28 QSOP
28 QSOP
28 QSOP
28 QSOP
Data Logging
Patient Monitoring
Touch Screens
Applications
DD
= V
LOGIC
(LSB)
LOGIC
±0.5
±0.5
INL
±1
±1
) at
o 12-Bit Resolution, ±0.5 LSB Linearity
o +3V Single Operation
o User-Adjustable Logic Level (+1.8V to +3.6V)
o Internal +2.5V Reference
o Software-Configurable, Analog Input Multiplexer
o Software-Configurable, Unipolar/Bipolar Inputs
o Low Power
o Internal 3MHz Full-Power Bandwidth Track/Hold
o Byte-Wide Parallel (8 + 4) Interface
o Small Footprint
Typical Operating Circuits appear at end of data sheet.
Pin Configurations continued at end of data sheet.
8-Channel Single Ended/
4-Channel Pseudo-Differential (MAX1261)
4-Channel Single Ended/
2-Channel Pseudo-Differential (MAX1263)
1.9mA (250ksps)
1.0mA (100ksps)
400µA (10ksps)
2µA (Shutdown)
28-Pin QSOP (MAX1261)
24-Pin QSOP (MAX1263)
TOP VIEW
D3/D11
D2/D10
D1/D9
D0/D8
HBEN
CLK
INT
WR
RD
CS
D7
D6
D5
D4
10
11
12
13
14
1
2
3
4
5
6
7
8
9
MAX1261
QSOP
Pin Configurations
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
V
REF
REFADJ
GND
COM
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
LOGIC
DD
Features
1

Related parts for MAX1261ACEI

MAX1261ACEI Summary of contents

Page 1

... MAX1262/MAX1264 data sheet. Industrial Control Systems Energy Management Data-Acquisition Systems Ordering Information PART TEMP RANGE PIN-PACKAGE 0°C to +70°C MAX1261ACEI 28 QSOP 0°C to +70°C MAX1261BCEI 28 QSOP -40°C to +85°C MAX1261AEEI 28 QSOP -40°C to +85°C MAX1261BEEI 28 QSOP Ordering Information continued at end of data sheet ...

Page 2

ADCs with +2.5V Reference and Parallel Interface ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0. GND.........................................................-0.3V to +6V LOGIC CH0–CH7, COM to GND ............................-0. REF, REFADJ 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 = V DD LOGIC cycle unless otherwise noted. Typical values ...

Page 4

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

Page 5

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

Page 6

ADCs with +2.5V Reference and Parallel Interface ( +3V +2.500V LOGIC REF 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 -0.5 ...

Page 7

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

Page 8

ADCs with +2.5V Reference and Parallel Interface PIN NAME MAX1261 MAX1263 1 1 HBEN D3/D11 7 7 D2/D10 8 8 D1/D9 9 ...

Page 9

ADCs with +2.5V Reference and Parallel Interface Detailed Description Converter Operation The MAX1261/MAX1263 ADCs use a successive- approximation (SAR) conversion technique and an input track/hold (T/H) stage to convert an analog input signal to a 12-bit ...

Page 10

ADCs with +2.5V Reference and Parallel Interface 12-BIT CAPACITIVE DAC REF INPUT C HOLD MUX ZERO – + CH0 CH1 12pF R CH2 IN 800Ω CH3 C SWITCH HOLD CH4 TRACK CH5 AT THE SAMPLING INSTANT, ...

Page 11

ADCs with +2.5V Reference and Parallel Interface conversion. The sampling interval occurs at the end of the acquisition interval. The ACQMOD (acquisition mode) bit in the input control byte (Table 1) offers two options for acquiring ...

Page 12

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

Page 13

ADCs with +2.5V Reference and Parallel Interface Selecting Clock Mode The MAX1261/MAX1263 operate with either an internal or an external clock. Control bits D6 and D7 select either internal or external clock mode. The parts retain ...

Page 14

ADCs with +2.5V Reference and Parallel Interface ACQUISITION STARTS CLK ACQMOD = 1 ACQUISITION STARTS CLK ACQMOD = 1 Figure 6b. External Clock and WR Timing (External Acquisition Mode) Table ...

Page 15

ADCs with +2.5V Reference and Parallel Interface Table 4. Channel Selection for Pseudo-Differential Operation (SGL/DIF = ...

Page 16

ADCs with +2.5V Reference and Parallel Interface When applying an external reference to REF, disable the internal reference buffer by connecting REFADJ The DC input resistance at REF is 25kΩ. DD Therefore, an ...

Page 17

ADCs with +2.5V Reference and Parallel Interface Table 6. Full Scale and Zero Scale for Unipolar and Bipolar Operation UNIPOLAR MODE Full scale Zero scale — sion cycles, and 2 read cycles. This assumes that the ...

Page 18

ADCs with +2.5V Reference and Parallel Interface CLK WR RD HBEN CONTROL D7–D0 D11–D8 D7–D0 BYTE HIGH LOW BYTE BYTE STATE ACQUISITION SAMPLING INSTANT Figure 10. Timing Diagram for Fastest Conversion ...

Page 19

ADCs with +2.5V Reference and Parallel Interface CLK V LOGIC MAX1261 REF µP WR REFADJ CONTROL INPUTS RD HBEN INT CH7 D7 CH6 CH5 D6 CH4 D5 CH3 D4 CH2 D3/D11 CH1 D2/D10 ...

Page 20

... 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. 20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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