MAX1202BEAP-T Maxim Integrated, MAX1202BEAP-T Datasheet

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MAX1202BEAP-T

Manufacturer Part Number
MAX1202BEAP-T
Description
Analog to Digital Converters - ADC
Manufacturer
Maxim Integrated
Datasheet

Specifications of MAX1202BEAP-T

Number Of Channels
8/4
Architecture
SAR
Conversion Rate
133 KSPs
Resolution
12 bit
Input Type
Single-Ended/Differential
Snr
70 dB
Interface Type
4-Wire (SPI, Microwire, TMS320)
Operating Supply Voltage
4.75 V to 5.25 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
4.096 V
The MAX1202/MAX1203 are 12-bit data-acquisition
systems specifically designed for use in applications
with mixed +5V (analog) and +3V (digital) supply volt-
ages. They operate with a single +5V analog supply or
dual ±5V analog supplies, and combine an 8-channel
multiplexer, high-bandwidth track/hold, and serial inter-
face with high conversion speed and low power con-
sumption.
A 4-wire serial interface connects directly to
SPI™/MICROWIRE™ devices without external logic,
and a serial strobe output allows direct connection to
TMS320-family digital signal processors. The
MAX1202/MAX1203 use either the internal clock or an
external serial-interface clock to perform successive-
approximation analog-to-digital conversions. The serial
interface operates at up to 2MHz.
The MAX1202 features an internal 4.096V reference,
while the MAX1203 requires an external reference. Both
parts have a reference-buffer amplifier that simplifies
gain trim. They also have a VL pin that is the power
supply for the digital outputs. Output logic levels (3V,
3.3V, or 5V) are determined by the value of the voltage
applied to this pin.
These devices provide a hard-wired SHDN pin and two
software-selectable power-down modes. Accessing the
serial interface automatically powers up the devices. A
quick turn-on time enables the MAX1202/MAX1203 to
be shut down between conversions, allowing the user
to optimize supply currents. By customizing power-
down between conversions, supply current can drop
below 10µA at reduced sampling rates.
The MAX1202/MAX1203 are available in 20-pin SSOP
and DIP packages, and are specified for the commer-
cial, extended, and military temperature ranges.
19-1173; Rev 2; 5/98
SPI is a registered trademark of Motorola, Inc.
MICROWIRE is a registered trademark of National
Semiconductor Corp.
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.
Typical Operating Circuit appears at end of data sheet.
5V/3V Mixed-Supply Systems
Data Acquisition
High-Accuracy Process Control
Battery-Powered Instruments
Medical Instruments
________________________________________________________________ Maxim Integrated Products
General Description
5V, 8-Channel, Serial, 12-Bit ADCs
Applications
with 3V Digital Interface
Ordering Information continued at end of data sheet.
* Dice are specified at T
MAX1202ACPP
MAX1202BCPP
MAX1202ACAP
MAX1202BCAP
MAX1202BC/D
8-Channel Single-Ended or 4-Channel
Differential Inputs
Operates from Single +5V or Dual ±5V Supplies
User-Adjustable Output Logic Levels
(2.7V to 5.25V)
Low Power: 1.5mA (operating mode)
Internal Track/Hold, 133kHz Sampling Rate
Internal 4.096V Reference (MAX1202)
SPI/MICROWIRE/TMS320-Compatible
4-Wire Serial Interface
Software-Configurable Unipolar/Bipolar Inputs
20-Pin DIP/SSOP
PART
TOP VIEW
SHDN
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
TEMP. RANGE
V
2µA (power-down mode)
SS
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
10
1
2
3
4
5
6
7
8
9
A
= +25°C, DC parameters only.
Ordering Information
DIP/SSOP
MAX1202
MAX1203
Pin Configuration
20 Plastic DIP
20 Plastic DIP
20 SSOP
20 SSOP
Dice*
PIN-PACKAGE
20
19
18
17
16
15
14
13
12
11
V
SCLK
CS
DIN
SSTRB
DOUT
VL
GND
REFADJ
REF
DD
Features
(LSB)
±1/2
±1/2
INL
±1
±1
±1
1

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MAX1202BEAP-T Summary of contents

Page 1

... Typical Operating Circuit appears at end of data sheet. SPI is a registered trademark of Motorola, Inc. MICROWIRE is a registered trademark of National Semiconductor Corp. ________________________________________________________________ Maxim Integrated Products 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. with 3V Digital Interface ...

Page 2

Serial, 12-Bit ADCs with 3V Digital Interface ABSOLUTE MAXIMUM RATINGS V to GND ................................................................-0. ...............................................................-0. GND .................................................................0. ................................................................-0.3V to 12V DD SS CH0–CH7 to ...

Page 3

ELECTRICAL CHARACTERISTICS (continued +5V ±5 2.7V to 3.6V cycle (133ksps); MAX1202—4.7µF capacitor at REF pin; MAX1203—external reference unless otherwise noted.) A MIN MAX PARAMETER SYMBOL CONVERSION RATE ...

Page 4

Serial, 12-Bit ADCs with 3V Digital Interface ELECTRICAL CHARACTERISTICS (continued +5V ±5 2.7V to 3.6V cycle (133ksps); MAX1202—4.7µF capacitor at REF pin; MAX1203—external reference ...

Page 5

ELECTRICAL CHARACTERISTICS (continued +5V ±5 2.7V to 3.6V cycle (133ksps); MAX1202—4.7µF capacitor at REF pin; MAX1203—external reference unless otherwise noted.) MIN to A MAX PARAMETER SYMBOL C C ...

Page 6

Serial, 12-Bit ADCs with 3V Digital Interface TIMING CHARACTERISTICS (V = +5V ±5 2.7V to 3.6V PARAMETER SYMBOL Acquisition Time t ACQ DIN to SCLK Setup DIN to SCLK Hold SCLK Fall to ...

Page 7

Operating Characteristics ( ±5 2.7V to 3.6V (133ksps); MAX1202—4.7µF capacitor at REF pin; MAX1203—external reference, V unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE 2.0 1.8 1.6 MAX1202 1.4 1.2 MAX1203 1.0 4.5 ...

Page 8

Serial, 12-Bit ADCs with 3V Digital Interface ____________________________Typical Operating Characteristics (continued ±5 2.7V to 3.6V (133ksps); MAX1202—4.7µF capacitor at REF pin; MAX1203—external reference, V unless otherwise noted.) INTEGRAL NONLINEARITY vs. ...

Page 9

DOUT DOUT 3k C LOAD GND a. High and High Figure 1. Load Circuits for Enable Time DOUT 3k C LOAD GND High-Z OH Figure 2. ...

Page 10

Serial, 12-Bit ADCs with 3V Digital Interface The T/H enters tracking mode on the falling clock edge after the fifth bit of the 8-bit control word is shifted in. The T/H enters hold mode on the falling clock ...

Page 11

Table 1a. Unipolar Full Scale and Zero Scale ZERO REFERENCE SCALE Internal 0V at REFADJ 0V External at REF 1.68 for the MAX1202, 1.64 for the MAX1203. The ADC’s input tracking circuitry has a 4.5MHz small-signal ...

Page 12

Serial, 12-Bit ADCs with 3V Digital Interface Table 2. Control-Byte Format Bit 7 Bit 6 (MSB) START SEL 2 Bit Name The first logic 1 bit after CS goes low defines the beginning of the control byte. 7 ...

Page 13

Simple Software Interface Make sure the CPU’s serial interface runs in master mode so the CPU generates the serial clock. Choose a clock frequency from 100kHz to 2MHz. 1) Set up the control byte for external clock mode and call ...

Page 14

Serial, 12-Bit ADCs with 3V Digital Interface CS t CSS t CSH SCLK DIN t DV DOUT Figure 7. Detailed Serial-Interface Timing CS t SDV SSTRB SCLK Figure 8. External Clock Mode SSTRB Detailed ...

Page 15

CS SCLK UNI/ DIN SEL2 SEL1 SEL0 BIP START SSTRB DOUT ADC STATE IDLE Figure 9. Internal Clock Mode Timing CS t CSH SSTRB SCLK PD0 CLOCK IN Figure 10. Internal Clock Mode SSTRB Detailed ...

Page 16

Serial, 12-Bit ADCs with 3V Digital Interface Figure 11a shows the serial-interface timing necessary to perform a conversion every 15 SCLK cycles in exter- nal clock mode low and SCLK is continuous, guarantee a start ...

Page 17

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 Hardware Power-Down The SHDN pin places ...

Page 18

Serial, 12-Bit ADCs with 3V Digital Interface CLOCK INTERNAL MODE SHDN SETS EXTERNAL CLOCK MODE DIN DOUT DATA VALID (12 DATA BITS) MODE POWERED UP Figure 12a. Timing Diagram for ...

Page 19

CLOCK MODE SETS INTERNAL CLOCK MODE DIN DOUT CONVERSION SSTRB MODE Figure 12b. Timing Diagram for Power-Down Modes, Internal Clock 2.55V ...

Page 20

Serial, 12-Bit ADCs with 3V Digital Interface FULL POWER-DOWN 1000 2ms FASTPD WAIT 400kHz EXTERNAL CLOCK INTERNAL COMPENSATION 100 100 150 200 250 300 CONVERSIONS PER CHANNEL PER SECOND Figure 14a. MAX1202 Supply Current ...

Page 21

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

Page 22

Serial, 12-Bit ADCs with 3V Digital Interface TMS320CL3x to MAX1202/ MAX1203 Interface Figure 19 shows an application circuit to interface the MAX1202/MAX1203 to the TMS320 in external clock mode. Figure 20 shows the timing diagram for this interface ...

Page 23

... TEMP. RANGE PIN-PACKAGE MAX1202AEPP -40°C to +85°C 20 Plastic DIP MAX1202BEPP -40°C to +85°C 20 Plastic DIP MAX1202AEAP -40°C to +85°C 20 SSOP MAX1202BEAP -40°C to +85°C 20 SSOP MAX1202BMJP -55°C to +125°C 20 CERDIP** MAX1203ACPP 0°C to +70°C 20 Plastic DIP MAX1203BCPP 0°C to +70°C 20 Plastic DIP MAX1203ACAP 0° ...

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

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