MAX188CEPP+ Maxim Integrated Products, MAX188CEPP+ Datasheet

IC ADC 12BIT SERIAL 20-DIP

MAX188CEPP+

Manufacturer Part Number
MAX188CEPP+
Description
IC ADC 12BIT SERIAL 20-DIP
Manufacturer
Maxim Integrated Products
Type
Data Acquisition System (DAS)r
Datasheet

Specifications of MAX188CEPP+

Resolution (bits)
12 b
Sampling Rate (per Second)
133k
Data Interface
Serial
Voltage Supply Source
Dual ±
Voltage - Supply
±5V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Through Hole
Package / Case
20-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX186/MAX188 are 12-bit data-acquisition sys-
tems that combine an 8-channel multiplexer, high-band-
width track/hold, and serial interface together with high
conversion speed and ultra-low power consumption.
The devices operate with a single +5V supply or dual
±5V supplies. The analog inputs are software config-
urable for unipolar/bipolar and single-ended/differential
operation.
The 4-wire serial interface directly connects to SPI™,
QSPI™ and Microwire™ devices without external logic. A
serial strobe output allows direct connection to TMS320
family digital signal processors. The MAX186/MAX188
use either the internal clock or an external serial-interface
clock to perform successive-approximation A/D conver-
sions. The serial interface can operate beyond 4MHz
when the internal clock is used.
The MAX186 has an internal 4.096V reference while the
MAX188 requires an external reference. Both parts
have a reference-buffer amplifier that simplifies gain
trim .
The MAX186/MAX188 provide a hard-wired SHDN pin
and two software-selectable power-down modes.
Accessing the serial interface automatically powers up
the devices, and the quick turn-on time allows the
MAX186/MAX188 to be shut down between every
conversion. Using this technique of powering down
between conversions, supply current can be cut to
under 10µA at reduced sampling rates.
The MAX186/MAX188 are available in 20-pin DIP and
SO packages, and in a shrink small-outline package
(SSOP), that occupies 30% less area than an 8-pin DIP.
For applications that call for a parallel interface, see the
MAX180/MAX181 data sheet. For anti-aliasing filters,
consult the MAX274/MAX275 data sheet.
________________________Applications
19-0123; Rev. 4; 8/96
SPI and QSPI are registered trademarks of Motorola.
Microwire is a registered trademark of National Semiconductor.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
_______________General Description
Portable Data Logging
Data-Acquisition
High-Accuracy Process Control
Automatic Testing
Robotics
Battery-Powered Instruments
Medical Instruments
________________________________________________________________ Maxim Integrated Products
Ordering Information continued on last page.
† NOTE: Parts are offered in grades A, B, C and D (grades defined
in Electrical Characteristics). When ordering, please specify grade.
Contact factory for availability of A-grade in SSOP package.
* Dice are specified at +25°C, DC parameters only.
* * Contact factory for availability and processing to MIL-STD-883.
____________________________Features
____________________Pin Configuration
Low-Power, 8-Channel,
______________Ordering Information
MAX186_CPP
MAX186_CWP
MAX186_CAP
MAX186DC/D
MAX186_EPP
MAX186_EWP
MAX186_EAP
MAX186_MJP
8-Channel Single-Ended or 4-Channel
Differential Inputs
Single +5V or ±5V Operation
Low Power: 1.5mA (operating mode)
Internal Track/Hold, 133kHz Sampling Rate
Internal 4.096V Reference (MAX186)
SPI-, QSPI-, Microwire-, TMS320-Compatible
4-Wire Serial Interface
Software-Configurable Unipolar or Bipolar Inputs
20-Pin DIP, SO, SSOP Packages
Evaluation Kit Available
TOP VIEW
PART
Serial 12-Bit ADCs
SHDN
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
V
SS
2µA (power-down mode)
10
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
1
2
3
4
5
6
7
8
9
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
DIP/SO/SSOP
MAX186
MAX188
20
19
18
17
16
15
14
13
12
11
PIN-PACKAGE
20 Plastic DIP
20 SO
20 SSOP
Dice*
20 Plastic DIP
20 SO
20 SSOP
20 CERDIP**
DIN
REFADJ
VREF
V
SCLK
CS
SSTRB
DOUT
DGND
AGND
DD
1

Related parts for MAX188CEPP+

MAX188CEPP+ Summary of contents

Page 1

... Robotics Battery-Powered Instruments Medical Instruments SPI and QSPI are registered trademarks of Motorola. Microwire is a registered trademark of National Semiconductor. ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 Low-Power, 8-Channel, Serial 12-Bit ADCs ____________________________Features 8-Channel Single-Ended or 4-Channel Differential Inputs Single +5V or ± ...

Page 2

Low-Power, 8-Channel, Serial 12-Bit ADCs ABSOLUTE MAXIMUM RATINGS V to AGND............................................................-0. AGND ............................................................+0. ..............................................................-0.3V to +12V DD SS AGND to DGND.....................................................-0.3V to +0.3V CH0–CH7 to AGND, DGND .............(V SS ...

Page 3

ELECTRICAL CHARACTERISTICS (continued ±5 -5V CLK 4.7µF capacitor at VREF pin; MAX188—external reference, VREF = 4.096V applied to VREF pin; T noted.) PARAMETER SYMBOL Small-Signal Bandwidth Full-Power Bandwidth CONVERSION RATE ...

Page 4

Low-Power, 8-Channel, Serial 12-Bit ADCs ELECTRICAL CHARACTERISTICS (continued ±5 -5V 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps); MAX186— CLK 4.7µF capacitor at VREF pin; MAX188—external reference, ...

Page 5

ELECTRICAL CHARACTERISTICS (continued ±5 -5V CLK 4.7µF capacitor at VREF pin; MAX188—external reference, VREF = 4.096V applied to VREF pin; T noted.) PARAMETER SYMBOL Positive Supply Rejection (Note 8) Negative ...

Page 6

Low-Power, 8-Channel, Serial 12-Bit ADCs __________________________________________Typical Operating Characteristics POWER-SUPPLY REJECTION vs. TEMPERATURE 0. +5V ± -5V SS 0.20 0.15 0.10 0.05 0.00 -0.05 -60 -40 - 100 ...

Page 7

Description (continued) PIN NAME Input to the Reference-Buffer Amplifier. To disable the reference-buffer amplifier, tie REFADJ to 12 REFADJ AGND Analog Ground. Also IN- Input for single-ended conversions. 14 DGND Digital Ground Serial Data Output. ...

Page 8

Low-Power, 8-Channel, Serial 12-Bit ADCs _______________Detailed Description The MAX186/MAX188 use a successive-approximation conversion technique and input track/hold (T/H) circuit convert an analog signal to a 12-bit digital output. A flexible serial interface provides easy interface to microprocessors. No ...

Page 9

MAX186 0V TO MAX188 4.096V CH7 ANALOG 0.01µF INPUT +5V D1 1N4148 REFADJ VREF C2 C1 0.01µF 4.7µF +2.5V +2.5V REFERENCE * FULL-SCALE ANALOG INPUT, CONVERSION RESULT = $FFF (HEX) **REQUIRED FOR MAX188 ONLY. A POTENTIOMETER MAY BE USED IN ...

Page 10

Low-Power, 8-Channel, Serial 12-Bit ADCs single-ended unipolar conversions on CH7 in external clock mode without powering down between conver- sions. In external clock mode, the SSTRB output pulses high for one clock period before the most significant bit of the ...

Page 11

Table 3. Channel Selection in Single-Ended Mode (SGL/ SEL2 SEL1 SEL0 CH0 Table 4. Channel ...

Page 12

Low-Power, 8-Channel, Serial 12-Bit ADCs CS t ACQ SCLK 1 4 START SEL2 SEL1 SEL0 UNI/ SCL/ DIN DIFF PD1 PD0 BIP SSTRB RB1 DOUT ACQUISITION IDLE A/D STATE 1.5µs (CLK = 2MHz) Figure 6. 24-Bit External Clock Mode Conversion ...

Page 13

CS t SDV SSTRB SCLK Figure 8. External Clock Mode SSTRB Detailed Timing CS SCLK START SEL2 SEL1 SEL0 UNI/ DIN DIP SSTRB DOUT IDLE A/D STATE Figure 9. Internal Clock Mode Timing In internal clock ...

Page 14

Low-Power, 8-Channel, Serial 12-Bit ADCs CS t CSH SSTRB SCLK PD0 CLOCK IN Figure 10. Internal Clock Mode SSTRB Detailed Timing The falling edge of CS does not start a conversion on the MAX186/MAX188. The first logic high clocked into ...

Page 15

CS 1 SCLK DIN S CONTROL BYTE 0 DOUT SSTRB Figure 11a. External Clock Mode, 15 Clocks/Conversion Timing CS SCLK S CONTROL BYTE 0 DIN DOUT Figure 11b. External Clock Mode, 16 Clocks/Conversion Timing Choosing Power-Down Mode You can save ...

Page 16

Low-Power, 8-Channel, Serial 12-Bit ADCs CLOCK INTERNAL MODE SHDN SETS EXTERNAL CLOCK MODE DIN DOUT DATA VALID (12 DATA BITS) POWERED UP MODE Figure 12a. Timing Diagram Power-Down Modes, External Clock Table ...

Page 17

CLOCK MODE SETS INTERNAL CLOCK MODE DIN DOUT SSTRB CONVERSION MODE Figure 12b. Timing Diagram Power-Down Modes, Internal Clock Hardware Power-Down The SHDN pin places the converter into the full power-down mode. ...

Page 18

Low-Power, 8-Channel, Serial 12-Bit ADCs MAX186 FULL POWER-DOWN 1000 2ms FASTPD WAIT 400kHz EXTERNAL CLOCK INTERNAL COMPENSATION 100 100 150 200 250 300 350 CONVERSIONS PER CHANNEL PER SECOND Figure 14a. MAX186 Supply Current vs. Sample ...

Page 19

OUTPUT CODE FULL-SCALE TRANSITION 111 110 101 011 010 001 000 0 ...

Page 20

Low-Power, 8-Channel, Serial 12-Bit ADCs SUPPLIES +5V - AGND V DGND DD SS MAX186/MAX188 * OPTIONAL Figure 18. Power-Supply Grounding Connection 1 CH0 2 CH1 3 CH2 ANALOG 4 CH3 MAX186 INPUTS 5 CH4 6 CH5 ...

Page 21

... This is a shell program for using a stand-alone 68HC16 without any external memory. The internal 1K RAM * is put into bank $0F to maintain 68HC11 code compatibility. This program was written with software * provided in the Motorola 68HC16 Evaluation Kit Roger J.A. Chen, Applications Engineer * MAXIM Integrated Products * November 20, 1992 * ****************************************************************************************************************************************************** INCLUDE ‘EQUATES.ASM’ ;Equates for common reg addrs INCLUDE ‘ ...

Page 22

Low-Power, 8-Channel, Serial 12-Bit ADCs ;set delay between transfers LDD #$0800 STD SPCR2 ;set ENDQP to $8 for 9 transfers ***** Initialize QSPI Command RAM ***** LDAA #$80 ;CONT=1,BITSE=0,DT=0,DSCK=0,PCS0=ACTIVE STAA $FD40 ;store first byte in COMMAND RAM LDAA #$C0 ;CONT=1,BITSE=1,DT=0,DSCK=0,PCS0=ACTIVE ...

Page 23

Figure 21. QSPI Assembly-Code Timing TMS320C3x to MAX186 Interface Figure 22 shows an application circuit to interface the MAX186/MAX188 to the TMS320 in external clock mode. The timing diagram for this interface circuit is shown in Figure 23. Use the ...

Page 24

... 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. 24 ____________________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1996 Maxim Integrated Products ...

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