MAX1240CCSA Maxim Integrated Products, MAX1240CCSA Datasheet

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MAX1240CCSA

Manufacturer Part Number
MAX1240CCSA
Description
+2.7V, low-power, 12-bit serial ADCs in 8-pin SO. INL (LSB) +1
Manufacturer
Maxim Integrated Products
Datasheet

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The MAX1240/MAX1241 are low-power, 12-bit analog-
to-digital converters (ADCs) available in 8-pin pack-
ages. The MAX1240 operates with a single +2.7V to
+3.6V supply, and the MAX1241 operates with a single
+2.7V to +5.25V supply. Both devices feature a 7.5µs
successive-approximation ADC, a fast track/hold
(1.5µs), an on-chip clock, and a high-speed, 3-wire ser-
ial interface.
Power consumption is only 37mW (V
73ksps maximum sampling speed. A 2µA shutdown
mode reduces power at slower throughput rates.
The MAX1240 has an internal 2.5V reference, while the
MAX1241 requires an external reference. The MAX1241
accepts signals from 0V to V
input range includes the positive supply rail. An exter-
nal clock accesses data from the 3-wire interface,
which connects directly to standard microcontroller I/O
ports. The interface is compatible with SPI™, QSPI™,
and MICROWIRE™.
Excellent AC characteristics and very low power com-
bined with ease of use and small package size make
these converters ideal for remote-sensor and data-
acquisition applications, or for other circuits with
demanding power consumption and space require-
ments. The MAX1240/MAX1241 are available in 8-pin
DIP and SO packages.
19-1155; Rev 2; 11/98
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
__________________General Description
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
TOP VIEW
Battery-Powered Systems
Portable Data Logging
Isolated Data Acquisition
Process Control
Instrumentation
SHDN
V
REF
AIN
DD
________________________________________________________________ Maxim Integrated Products
1
2
3
4
MAX1240
MAX1241
DIP/SO
Pin Configuration
REF
, and the reference
Applications
8
7
6
5
DD
SCLK
CS
DOUT
GND
= 3V) at the
12-Bit Serial ADCs in 8-Pin SO
Ordering Information continued at end of data sheet.
* Dice are specified at T
________________________________Features
MAX1240ACPA
MAX1240BCPA
MAX1240CCPA
MAX1240ACSA
MAX1240BCSA
MAX1240CCSA
SCLK
SHDN
MAX1240BC/D
REF
Single-Supply Operation:
12-Bit Resolution
Internal 2.5V Reference (MAX1240)
Small Footprint: 8-Pin DIP/SO Packages
Low Power: 3.7µW (73ksps, MAX1240)
Internal Track/Hold
SPI/QSPI/MICROWIRE 3-Wire Serial Interface
Internal Clock
AIN
CS
PART
+2.7V to +3.6V (MAX1240)
+2.7V to +5.25V (MAX1241)
3mW (73ksps, MAX1241)
66µW (1ksps, MAX1241)
5µW (power-down mode)
7
8
3
2
4
+2.7V, Low-Power,
(MAX1240 ONLY)
2.5V REFERENCE
CONTROL
LOGIC
T/H
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
A
= +25°C, DC parameters only.
Ordering Information
Functional Diagram
GND
5
V
12-BIT
DD
SAR
1
CLOCK
INT
8 Plastic DIP
8 Plastic DIP
8 Plastic DIP
8 SO
8 SO
8 SO
Dice*
PACKAGE
PIN-
MAX1240
MAX1241
REGISTER
OUTPUT
SHIFT
6
(LSB)
±
±
INL
±1
±1
±1
±1
±1
1
1
DOUT
/
/
2
2
1

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MAX1240CCSA Summary of contents

Page 1

... DD 66µW (1ksps, MAX1241) 5µW (power-down mode) Internal Track/Hold SPI/QSPI/MICROWIRE 3-Wire Serial Interface , and the reference Internal Clock PART MAX1240ACPA MAX1240BCPA MAX1240CCPA MAX1240ACSA MAX1240BCSA MAX1240CCSA MAX1240BC/D Applications Ordering Information continued at end of data sheet. * Dice are specified SCLK 3 SHDN SCLK 8 ...

Page 2

Low-Power, 12-Bit Serial ADCs in 8-Pin SO ABSOLUTE MAXIMUM RATINGS V to GND .............................................................-0.3V to +6V DD AIN to GND................................................-0. REF to GND ...............................................-0. Digital Inputs to GND...............................................-0.3V to +6V DOUT to GND............................................-0. ...

Page 3

ELECTRICAL CHARACTERISTICS (continued +2.7V to +3.6V (MAX1240 capacitor at REF pin, MAX1241—external reference; V PARAMETER SYMBOL INTERNAL REFERENCE (MAX1240 only) REF Output Voltage REF Short-Circuit Current REF Temperature Coefficient Load Regulation (Note 4) Capacitive Bypass ...

Page 4

Low-Power, 12-Bit Serial ADCs in 8-Pin SO ELECTRICAL CHARACTERISTICS (continued +2.7V to +3.6V (MAX1240 capacitor at REF pin, MAX1241—external reference; V PARAMETERS SYMBOL POWER REQUIREMENTS Supply Voltage V DD Supply Current I DD Supply ...

Page 5

DOUT 6k DGND a) High and Figure 1. Load Circuits for DOUT Enable Time DOUT 6k DGND High-Z OH Figure 2. Load Circuits for DOUT Disable Time __________________________________________Typical Operating ...

Page 6

Low-Power, 12-Bit Serial ADCs in 8-Pin SO ____________________________Typical Operating Characteristics (continued 3.0V 2.5V 2.1MHz REF SCLK SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 ...

Page 7

Operating Characteristics (continued 3.0V, REF = 2.5V 2.1MHz SCLK INTEGRAL NONLINEARITY vs. CODE 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 0 1024 2048 3072 CODE _______________________________________________________________________Pin Description PIN NAME 1 V Positive Supply ...

Page 8

Low-Power, 12-Bit Serial ADCs in 8-Pin SO +2.7V to +3.6V 4 SCLK DD 2 ANALOG INPUT MAX1240 AIN MAX1241 REF SHUTDOWN 3 SHDN DOUT INPUT 4 REF GND ...

Page 9

Higher source impedances can be used if a 0.01µF capacitor is connected to the analog input. Note that the input capacitor forms an RC filter with the input source impedance, limiting the ADC’s input signal bandwidth. The ADCs’ input tracking ...

Page 10

Low-Power, 12-Bit Serial ADCs in 8-Pin SO ed. After an internally timed conversion period, the end of conversion is signaled by DOUT pulling high. Data can then be shifted out serially with the external clock. SHDN to Reduce Supply ...

Page 11

CS t CS0 SCLK t DV DOUT t APR (TRACK/ACQUIRE) INTERNAL T/H Figure 9. Detailed Serial-Interface Timing End of conversion (EOC) is signaled by DOUT going high. DOUT’s rising edge can be used as a framing signal. SCLK shifts the ...

Page 12

Low-Power, 12-Bit Serial ADCs in 8-Pin SO 5) With CS = high, wait the minimum specified time, tCS, before initiating a new conversion by pulling CS low conversion is aborted by pulling CS high before the conversion’s ...

Page 13

SCLK CS t CONV D11 D10 DOUT* MSB EOC *WHEN CS IS HIGH, DOUT = HIGH -Z Figure 12. SPI/MICROWIRE Serial Interface Timing (CPOL = CPHA = 0) SCLK CS t CONV DOUT* EOC *WHEN CS IS HIGH, DOUT = ...

Page 14

Low-Power, 12-Bit Serial ADCs in 8-Pin SO __Ordering Information (continued) PART TEMP. RANGE PACKAGE MAX1240AEPA -40°C to +85°C 8 Plastic DIP MAX1240BEPA -40°C to +85°C 8 Plastic DIP MAX1240CEPA -40°C to +85°C 8 Plastic DIP MAX1240AESA -40°C to +85°C ...

Page 15

Information ______________________________________________________________________________________ +2.7V, Low-Power, 12-Bit Serial ADCs in 8-Pin SO 15 ...

Page 16

... 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. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products Printed USA ...

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