MAX1293BEEG+ Maxim Integrated Products, MAX1293BEEG+ Datasheet

IC ADC 12BIT 250KSPS 24-QSOP

MAX1293BEEG+

Manufacturer Part Number
MAX1293BEEG+
Description
IC ADC 12BIT 250KSPS 24-QSOP
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX1293BEEG+

Number Of Bits
12
Sampling Rate (per Second)
250k
Data Interface
Parallel
Number Of Converters
1
Power Dissipation (max)
762mW
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-QSOP
Number Of Adc Inputs
4
Architecture
SAR
Conversion Rate
250 KSPs
Resolution
12 bit
Voltage Reference
Internal 2.5 V or External
Supply Voltage (max)
3.3 V
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX1291/MAX1293 low-power, 12-bit analog-to-dig-
ital converters (ADCs) feature a successive-approxima-
tion 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
allows them to interface directly with a +1.8V to +5.5V
digital supply.
Power consumption is only 5.7mW (V
maximum sampling rate of 250ksps. Two software-selec-
table power-down modes enable the MAX1291/
MAX1293 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 MAX1291 has
eight input channels and the MAX1293 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 MAX1291/MAX1293 tri-states INT when CS goes
high. Refer to MAX1261/MAX1263 if tri-stating INT is not
desired.
The MAX1291 is available in a 28-pin QSOP package,
while the MAX1293 is available in a 24-pin QSOP. For
pin-compatible +5V, 12-bit versions, refer to the
MAX1290/MAX1292 data sheet.
19-1532; Rev 3; 12/02
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.
MAX1291ACEI
MAX1291BCEI
MAX1291AEEI
MAX1291BEEI
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
LOGIC
pin that
) at the
(LSB)
±0.5
±1
±0.5
±1
INL
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: 1.9mA (250ksps)
o Internal 3MHz Full-Power Bandwidth Track/Hold
o Byte-Wide Parallel (8 + 4) Interface
o Small Footprint: 28-Pin QSOP (MAX1291)
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 (MAX1291)
4-Channel Single-Ended/
2-Channel Pseudo-Differential (MAX1293)
TOP VIEW
D3/D11
D2/D10
D1/D9
D0/D8
HBEN
CLK
INT
WR
1.0mA (100ksps)
400µA (10ksps)
2µA (Shutdown)
RD
CS
D7
D6
D5
D4
10
11
12
13
14
1
2
3
4
5
6
7
8
9
24-Pin QSOP (MAX1293)
MAX1291
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 MAX1293BEEG+

MAX1293BEEG+ Summary of contents

Page 1

... QSOP -40°C to +85°C MAX1291BEEI 28 QSOP Ordering Information continued at end of data sheet. ________________________________________________________________ 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. 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 ...

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 MAX1291 MAX1293 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 MAX1291/MAX1293 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 CH2 R IN 800Ω CH3 C SWITCH HOLD CH4 TRACK AT THE SAMPLING INSTANT, CH5 ...

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" HIGH-Z INT RD HBEN HIGH-Z DOUT Figure 4. Conversion Timing Using Internal Acquisition ...

Page 13

ADCs with +2.5V Reference and Parallel Interface Selecting Clock Mode The MAX1291/MAX1293 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 results of ...

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 MAX1291 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 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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