MAX1112EAP-T Maxim Integrated, MAX1112EAP-T Datasheet

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MAX1112EAP-T

Manufacturer Part Number
MAX1112EAP-T
Description
Analog to Digital Converters - ADC
Manufacturer
Maxim Integrated
Datasheet

Specifications of MAX1112EAP-T

Number Of Channels
8/4
Architecture
SAR
Conversion Rate
50 KSPs
Resolution
8 bit
Input Type
Single-Ended/Differential
Snr
Yes
Interface Type
4-Wire (SPI, Microwire), QSPI
Operating Supply Voltage
4.5 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SSOP-20
Maximum Power Dissipation
640 mW
Minimum Operating Temperature
- 40 C
Number Of Converters
1
Voltage Reference
Internal 4.096 V or External
The MAX1112/MAX1113 low-power, 8-bit, 8-channel
analog-to-digital converters (ADCs) feature an internal
track/hold, voltage reference, clock, and serial inter-
face. They operate from a single 4.5V to 5.5V supply
and consume only 135µA while sampling at rates up to
50ksps. The MAX1112’s 8 analog inputs and the
MAX1113’s 4 analog inputs are software-configurable,
allowing unipolar/bipolar and single-ended/differential
operation.
Successive-approximation conversions are performed
using either the internal clock or an external serial-inter-
face clock. The full-scale analog input range is deter-
mined by the 4.096V internal reference, or by an
externally applied reference ranging from 1V to V
The 4-wire serial interface is compatible with the SPI™,
QSPI™, and MICROWIRE™ serial-interface standards.
A serial-strobe output provides the end-of-conversion
signal for interrupt-driven processors.
The MAX1112/MAX1113 have a software-program-
mable, 2µA automatic power-down mode to minimize
power consumption. Using power-down, the supply
current is reduced to 13µA at 1ksps, and only 82µA at
10ksps. Power-down can also be controlled using the
SHDN input pin. Accessing the serial interface automat-
ically powers up the device.
The MAX1112 is available in a 20-pin SSOP package.
The MAX1113 is available in a small 16-pin QSOP
package.
Pin Configurations appear at end of data sheet.
________________________Applications
19-1231; Rev 2; 4/11
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Portable Data Logging
Hand-Held Measurement Devices
Medical Instruments
System Diagnostics
Solar-Powered Remote Systems
4mA to 20mA-Powered Remote
Data-Acquisition Systems
________________________________________________________________ Maxim Integrated Products
General Description
+5V, Low-Power, Multi-Channel,
DD
.
♦ 4.5V to 5.5V Single Supply
♦ Low Power: 135µA at 50ksps
♦ 8-Channel Single-Ended or 4-Channel Differential
♦ 4-Channel Single-Ended or 2-Channel Differential
♦ Internal Track/Hold; 50kHz Sampling Rate
♦ Internal 4.096V Reference
♦ SPI/QSPI/MICROWIRE-Compatible Serial Interface
♦ Software-Configurable Unipolar or Bipolar Inputs
♦ Total Unadjusted Error: ±1 LSB (max)
Ordering Information continued at end of data sheet.
____________________________Features
REFOUT
SHDN
REFIN
SCLK
CH4*
CH5*
CH6*
CH7*
COM
*MAX1112 ONLY
Inputs (MAX1112)
Inputs (MAX1113)
CH0
CH1
CH2
CH3
DIN
CS
REGISTER
ANALOG
INPUT
SHIFT
INPUT
MUX
Serial 8-Bit ADCs
13µA at 1ksps
REFERENCE
+4.096V
CONTROL
T/H
LOGIC
Functional Diagram
±0.3 LSB (typ)
IN
CLOCK
SAR ADC
CLOCK
8-BIT
INT
REF
OUT
MAX1112
MAX1113
REGISTER
OUTPUT
SHIFT
DOUT
SSTRB
V
DGND
AGND
DD
1

Related parts for MAX1112EAP-T

MAX1112EAP-T Summary of contents

Page 1

... Pin Configurations appear at end of data sheet. SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. +5V, Low-Power, Multi-Channel, ...

Page 2

... Harmonic) Spurious-Free Dynamic Range Channel-to-Channel Crosstalk Small-Signal Bandwidth Full-Power Bandwidth 2 _______________________________________________________________________________________ Operating Temperature Ranges MAX1112CAP/MAX1113CEE...............................0°C to +70°C MAX1112EAP/MAX1113EEE ............................-40°C to +85°C + 0.3V) Storage Temperature Range .............................-65°C to +150°C DD Lead Temperature (soldering, 10s) .................................+300°C + 0.3V) Soldering Temperature (reflow) .......................................+260° 0V 500kHz, external clock (50% duty cycle) ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 4.5V to 5.5V; unipolar input mode (50ksps); 1µF capacitor at REFOUT PARAMETER SYMBOL CONVERSION RATE Conversion Time (Note 4) Track/Hold Acquisition Time Aperture Delay Aperture Jitter Internal Clock Frequency External Clock-Frequency ...

Page 4

Low-Power, Multi-Channel, Serial 8-Bit ADCs ELECTRICAL CHARACTERISTICS (continued 4.5V to 5.5V; unipolar input mode (50ksps); 1µF capacitor at REFOUT PARAMETER SYMBOL DIGITAL INPUTS (DIN, SCLK, CS) DIN, SCLK, CS Input High Voltage DIN, ...

Page 5

TIMING CHARACTERISTICS (Figures 8 and 4.5V to 5.5V unless otherwise noted MIN MAX PARAMETER SYMBOL Track/Hold Acquisition Time DIN to SCLK Setup DIN to SCLK Hold SCLK Fall to ...

Page 6

Low-Power, Multi-Channel, Serial 8-Bit ADCs __________________________________________Typical Operating Characteristics (V = 5.0V 500kHz; external clock (50% duty cycle SCLK SUPPLY CURRENT vs. TEMPERATURE 180 OUTPUT CODE = FULL SCALE C = 10pF LOAD 160 V = ...

Page 7

PIN NAME MAX1112 MAX1113 1–4 1–4 CH0–CH3 5–8 — CH4–CH7 9 5 COM SHDN REFIN 12 8 REFOUT 13 9 AGND 14 10 DGND 15 11 DOUT 16 12 SSTRB 17 13 DIN ...

Page 8

Low-Power, Multi-Channel, Serial 8-Bit ADCs _______________Detailed Description The MAX1112/MAX1113 analog-to-digital converters (ADCs) use a successive-approximation conversion technique and input track/hold (T/H) circuitry to convert an analog signal to an 8-bit digital output. A flexible seri- al interface provides easy ...

Page 9

Table 1a. MAX1112 Channel Selection in Single-Ended Mode (SGL/DIF = 1) SEL2 SEL1 SEL0 CH0 ...

Page 10

Low-Power, Multi-Channel, Serial 8-Bit ADCs The time required for the T/H to acquire an input signal is a function of how quickly its input capacitance is charged. If the input signal’s source impedance is high, the acquisition time lengthens, ...

Page 11

Table 4. Full-Scale and Zero-Scale Voltages UNIPOLAR MODE Full Scale Zero Scale V + COM COM REFIN in control bytes of $FF (hex), which trigger single- ended, unipolar conversions on CH7 (MAX1112) or CH3 (MAX1113) in external clock mode without ...

Page 12

Low-Power, Multi-Channel, Serial 8-Bit ADCs I/O SCK MISO + SPI CS SCK MISO + QSPI I MICROWIRE Figure 6. Common Serial-Interface Connections to the MAX1112/MAX1113 SCLK SEL2 SEL1 SEL0 ...

Page 13

In unipolar input mode, the output is straight binary (Figure 15). For bipolar inputs, the output is two’s-com- plement (Figure 16). Data is clocked out at SCLK’s falling edge in MSB-first format. The MAX1112/MAX1113 can use either an external ser- ...

Page 14

Low-Power, Multi-Channel, Serial 8-Bit ADCs SCLK SEL2 SEL1 SEL0 UNI/ BIP DIN START SSTRB DOUT A/D STATE IDLE Figure 10. Internal Clock Mode Timing CS t CSH SSTRB SCLK PD0 CLOCK IN Figure ...

Page 15

CS 1 SCLK DIN S CONTROL BYTE 0 DOUT SSTRB Figure 12a. Continuous Conversions, External Clock Mode, 10 Clocks/Conversion Timing CS SCLK S CONTROL BYTE 0 DIN DOUT Figure 12b. Continuous Conversions, External Clock Mode, 16 Clocks/Conversion Timing The falling ...

Page 16

Low-Power, Multi-Channel, Serial 8-Bit ADCs __________Applications Information When power is first applied, and if SHDN is not pulled low, internal power-on reset circuitry activates the MAX1112/MAX1113 in internal clock mode. SSTRB is high on power-up and ...

Page 17

CLOCK INTERNAL MODE SHDN SETS EXTERNAL CLOCK MODE DIN DATA VALID DOUT MODE POWERED UP Figure 14a. Power-Down Modes, External Clock Timing Diagram SETS INTERNAL CLOCK MODE ...

Page 18

Low-Power, Multi-Channel, Serial 8-Bit ADCs OUTPUT CODE FULL-SCALE TRANSITION 11111111 11111110 11111101 00000011 00000010 00000001 00000000 (COM) INPUT VOLTAGE (LSB) Figure 15. Unipolar Transfer Function OUTPUT CODE V REFIN + COM 2 01111111 ...

Page 19

... SHDN 10 SSOP Ordering Information PART TEMP RANGE MAX1112CAP+ 0°C to +70°C MAX1112C/D 0°C to +70°C MAX1112EAP+ -40°C to +85°C MAX1113CEE+ 0°C to +70°C MAX1113EEE+ 40°C to +85°C +Denotes a lead(Pb)-free/RoHS-compliant package. *Dice are specified +25°C, DC parameters only. A ______________________________________________________________________________________ +5V, Low-Power, Multi-Channel, ...

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 © 2011 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, inc ...

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