ML2258BIP Micro Linear, ML2258BIP Datasheet

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ML2258BIP

Manufacturer Part Number
ML2258BIP
Description
MuP compatible 8-bit A/D converter with 8 channel multiplexer
Manufacturer
Micro Linear
Datasheet

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GENERAL DESCRIPTION
The ML2258 combines an 8-bit A/D converter, 8-channel
analog multiplexer, and a microprocessor compatible 8-
bit parallel interface and control logic in a single
monolithic device.
Easy interface to microprocessors is provided by the
latched and decoded multiplexer address inputs and
latched three-state outputs.
The device is suitable for a wide range of applications
from process and machine control to consumer,
automotive, and telecommunication applications.
The ML2258 is an enhanced, pin-compatible, second
source for the industry standard ADC0808/ADC0809. The
ML2258 enhancements are faster conversion time, true
sample and hold function, superior power supply
rejection, wider reference range, and a double buffered
data bus as well as faster digital timing. All parameters
are guaranteed over temperature with a power supply
voltage of 5V ±10%.
BLOCK DIAGRAM
LATCH ENABLE
ADDRESS
ADDR0
ADDR1
ADDR2
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
MULTIPLEXER
8-CHANNEL
DECODER
ADDRESS
LATCH
AND
V
CC
µP Compatible 8-Bit A/D Converter
SAMPLE HOLD
COMPARATOR
GND
A/D WITH
+V
REF
CONTROL & TIMING
with 8-Channel Multiplexer
START
SWITCH TREE
FEATURES
* Some Packages Are End Of Life As Of August 1, 2000
CAPACITOR/
RESISTOR
Conversion time
Total unadjusted error
No missing codes
Sample and hold
Capable of digitizing a 5V, 50kHz sine wave
8-input multiplexer
0V to 5V analog input range with single 5V
power supply
Operates ratiometrically or with up to 5V
voltage reference
No zero-or full-scale adjust required
Analog input protection
Low power dissipation
TTL and CMOS compatible digital inputs and outputs
Standard 28-pin DIP or surface mount PCC
Superior pin compatible replacement for ADC0808 and
ADC0809
S.A.R.
ARRAY
CLOCK
–V
REF
OUTPUT
OUTPUT
BUFFER
ENABLE
LATCH
THREE
STATE
END OF CONVERSION
(INTERRUPT)
6.6µs
±1/2LSB or ±1LSB
390ns acquisition
25mA per input min
3mA max
ML2258*
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
May 1997
1

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ML2258BIP Summary of contents

Page 1

GENERAL DESCRIPTION The ML2258 combines an 8-bit A/D converter, 8-channel analog multiplexer, and a microprocessor compatible 8- bit parallel interface and control logic in a single monolithic device. Easy interface to microprocessors is provided by the latched and decoded multiplexer ...

Page 2

ML2258 PIN CONFIGURATION ML2258 28-Pin DIP (P28) IN3 1 IN4 2 IN5 3 IN6 4 IN7 5 START 6 EOC 7 DB3 CLK REF GND 13 DB1 14 TOP VIEW PIN ...

Page 3

... CC Molded Chip Carrier Package 6.5V Vapor Phase (60 sec.) ..................................... 215°C Infrared (15 sec.) ............................................ 220°C +0.3V CC +0.3V CC OPERATING CONDITIONS Supply Voltage, V Temperature Range (Note 3) ................. T ML2258BIP, ML2258BIQ, ML2258CIP, ML2258CIQ ........................................ –40°C to +85° ±10%, –V MAX CC REF ML2258B TYP MIN (NOTE 4) ...

Page 4

ML2258 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER AC and Dynamic Performance Characteristics (Note 10) t Sample and Hold Acquisition ACQ f Clock Frequency CLK t Conversion Time C SNR Signal to Noise Ratio THD Total Harmonic Distortion IMD Intermodulation Distortion FR Frequency ...

Page 5

H1 DATA OUTPUT 10K 10K DATA OUTPUT C L Figure 1. High Impedance Test Circuits and Waveforms TYPICAL PERFORMANCE CURVES 1.0 0.75 0.5 0. ...

Page 6

ML2258 TYPICAL PERFORMANCE CURVES 1 0.75 0.5 0. 1.5 1 0.5 0 Figure 4. Unadjusted Offset Error (Continued) 125 C – REF DC Figure 3. Linearity Error ...

Page 7

FUNCTIONAL DESCRIPTION 1.1 MULTIPLEXER ADDRESSING The ML2258 contains an 8-channel single ended analog multiplexer. A particular input channel is selected by using the address decoder. The relationship between the address inputs, ADDR0–ADDR2, and the analog input selected is shown ...

Page 8

ML2258 valid on DB0–DB7 until the next conversion updates the data word on the next rising edge of EOC. A conversion can be interrupted and restarted at any time by a new START pulse. 1.3 ANALOG INPUTS AND SAMPLE/HOLD The ...

Page 9

POWER SUPPLY AND REFERENCE DECOUPLING A 10µF electrolytic capacitor is recommended to bypass V to GND, using as short a lead length as possible addition, with clock frequencies above 1MHz, a 0.1µF ceramic disc capacitor should be ...

Page 10

ML2258 2.0 TYPICAL APPLICATIONS 15V DC + 600 ANALOG IN – ML2258 –15V DC GND Figure 7. Protecting the Input from Overvoltage XDR XDR ZERO + ADJ 10 F Figure 8. Operating with ...

Page 11

PHYSICAL DIMENSIONS 28 PIN 0.180 MAX (4.57 MAX) 0.125 - 0.135 (3.18 - 3.43) 0.485 - 0.495 (12.32 - 12.57) 0.450 - 0.456 (11.43 - 11.58) 1 PIN 1 ID 0.042 - 0.048 (1.07 - 1.22) 8 ...

Page 12

... ML2258 ORDERING INFORMATION ALTERNATE PART NUMBER PART NUMBER ML2258BIP (EOL) ADC0808CCN ML2258BIQ ADC0808CCV ML2258CIP (EOL) ADC0809CCN ML2258CIQ ADC0809CCV © Micro Linear 1997 is a registered trademark of Micro Linear Corporation Products described in this document may be covered by one or more of the following patents, U.S.: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; ...

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