ML2259BCP Micro Linear, ML2259BCP Datasheet

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ML2259BCP

Manufacturer Part Number
ML2259BCP
Description
MuP compatible 8-bit A/D converters with 2 or 8 channel multiplexer
Manufacturer
Micro Linear
Datasheet

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GENERAL DESCRIPTION
The ML2252 and ML2259 combine an 8-bit A/D
converter, 2- or 8-channel analog multiplexer, and a
microprocessor compatible 8-bit parallel interface and
control logic in a single monolithic CMOS device.
Easy interface to microprocessors is provided by the
latched and decoded multiplexer address inputs and a
double buffered three-state data bus. These analog-to-
digital converters allow the microprocessor to operate
completely asynchronous to the converter clock.
The built in sample and hold function provides the ability
to digitize a 5V, 50kHz sinewave to 8-bit accuracy. The
differential comparator design provides low power supply
sensitivity to DC and AC variations. The voltage reference
can be externally set to any value between ground and
V
small span. All parameters are guaranteed over
temperature with a power supply voltage of 5V ±10%.
The device is suitable for a wide range of applications
from process and machine control to consumer,
automotive, and telecommunication applications.
ML2252 BLOCK DIAGRAM
CC
, thus allowing a full conversion over a relatively
CH0
CH1
MULTIPLEXER
2-CHANNEL
DECODER
V
ADDRESS
CC
LATCH
ALE
AND
A0
GND
SAMPLE-AND-HOLD FUNCTION
µP Compatible 8-Bit A/D Converters
8pF
8pF
+
A/D WITH
with 2- or 8-Channel Multiplexer
+
COMP
FEATURES
* This Part Is Obsolete
** This Part Is End of Life As Of August 1, 2000
CLOCK
Conversion time (f
Total unadjusted error; ±1/2LSB or ±1LSB
No missing codes
Sample and hold; 390ns acquisition
Capable of digitizing a 5V, 50kHz sinewave
2- or 8-channel 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; 25mA per input min
Continuous conversion mode
Low power dissipation; 15mW max
TTL and CMOS compatible digital inputs and outputs
APPROXIMATION
SUCCESSIVE
CONTROL
& TIMING
CONVERTER
REGISTER
+V
D/A
REF
ML2252*,
–V
REF
CLK
= 1.46MHz); 6.6µs
OUTPUT
BUFFER
THREE
STATE
OE
START
EOC
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
ML2259**
May 1997
1

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ML2259BCP Summary of contents

Page 1

GENERAL DESCRIPTION The ML2252 and ML2259 combine 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 CMOS device. Easy interface to microprocessors is provided by the ...

Page 2

ML2252, ML2259 ML2259 BLOCK DIAGRAM CH0 CH1 CH2 CH3 8-CHANNEL MULTIPLEXER CH4 CH5 CH6 CH7 ADDRESS LATCH AND DECODER ALE PIN CONFIGURATION ML2252 20-Pin DIP (P20) CH1 1 20 START 2 19 EOC 3 18 DB3 4 ...

Page 3

PIN DESCRIPTION Pin Number ML2252 ML2259 Name 1 CH3 2 CH4 3 CH5 4 CH6 5 CH7 2 6 START 3 7 EOC 4 8 DB3 CLK REF ...

Page 4

ML2252, ML2259 ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. Supply Voltage .............................................................. Logic Inputs ...

Page 5

ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER AC and Dynamic Performance Characteristics (Note 5) 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 Response ...

Page 6

ML2252, ML2259 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 0.25 0 0.001 90% OUTPUT 50% ENABLE ...

Page 7

TYPICAL PERFORMANCE CURVES 1 0.75 0.5 25°C 0. REF DC Figure 3. Linearity Error vs V 1.0 FUNCTIONAL DESCRIPTION 1.1 MULTIPLEXER ADDRESSING The ML2252 and ML2259 contain a single ended analog multiplexer. A ...

Page 8

ML2252, ML2259 Another advantage of the capacitor array approach used in the ML2252 and ML2259 is the inherent sample-and-hold function. This true S/H allows an accurate conversion to be done on the input even if the analog signal is not ...

Page 9

REFERENCE The voltage applied to the +V and –V REF defines the voltage span of the analog input (the difference between V and V INMAX INMIN 256 possible output codes apply. The devices can be used in either ratiometric ...

Page 10

ML2252, ML2259 Intermodulation Distortion With inputs consisting of sine waves at two frequencies, f and f , any active device with nonlinearities will A B create distortion products, of order (m + n), at sum and difference frequencies of mf ...

Page 11

PHYSICAL DIMENSIONS 20 PIN 0.060 MIN (1.52 MIN) (4 PLACES) 0.170 MAX (4.32 MAX) 0.125 MIN (3.18 MIN) 0.385 - 0.395 (9.78 - 10.03) 0.350 - 0.356 (8.89 - 9.04) 0.042 - 0.048 6 (1.07 - 1.22) ...

Page 12

ML2252, ML2259 PHYSICAL DIMENSIONS 28 PIN 0.070 MIN (1.77 MIN) (4 PLACES) 0.190 MAX (4.83 MAX) 0.125 MIN (3.18 MIN) 0.485 - 0.495 (12.32 - 12.57) 0.450 - 0.456 (11.43 - 11.58) 1 PIN 1 ID 0.042 ...

Page 13

... Two Analog Inputs, 20-Pin Package ML2252BCP (OBS) ML2252BCQ (OBS) ML2252CCP (OBS) ML2252CCQ (OBS) Eight Analog Inputs, 28-Pin Package ML2259BCP (EOL) ML2259BCQ (OBS) ML2259CCP (OBS) ML2259CCQ (OBS) © 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; 5,546,017; ...

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