May 1997
ML2264*
4-Channel High-Speed 8-Bit
A/D Converter with T/H (S/H)
GENERAL DESCRIPTION
The ML2264 is a high-speed, µP compatible, 4-channel
8-bit A/D converter with a conversion time of 680ns over
the operating temperature range and supply voltage
tolerance. The ML2264 operates from a single 5V supply
and has an analog input range from GND to V
CC
.
The ML2264 has two different pin selectable modes. The
T/H mode has an internal track and hold. The S/H mode
has a true internal sample and hold and can digitize 0 to
5V sinusoidal signals as high as 500kHz.
The ML2264 digital interface has been designed so that
the device appears as a memory location or I/O port to a
µP. Analog input channels are selected by the latched and
decoded multiplexer address inputs.
The ML2264 is an enhanced, pin compatible second
source for the industry standard AD7824. The ML2264
enhancements are faster conversion time, parameters
guaranteed over the supply tolerance and temperature
range, improved digital interface timing, superior power
supply rejection, and better latchup immunity on analog
inputs.
FEATURES
s
Conversion time, WR-RD mode over temperature and
supply voltage tolerance
Track & Hold Mode ................................. 830ns max
Sample & Hold Mode .............................. 700ns max
Total unadjusted error ..................... ±1/2 LSB or ±1 LSB
Capable of digitizing a 5V, 250kHz sine wave
4-analog input channels
No missing codes
0V to 5V analog input range with single 5V power
supply
No zero or full scale adjust required
Analog input protection ............................... 25mA min
Operates ratiometrically or with up to 5V voltage
reference
No external clock required
Power-on reset circuitry
Low power ....................................................... 100mW
Narrow 24-pin DIP, SOIC, or SSOP
Superior pin compatible replacement for AD7824
s
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s
s
s
s
s
s
s
s
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BLOCK DIAGRAM
V
CC
+V
REF
SH/TH
+V
REF
4-BIT
FLASH
A/D
(MSB)
DECODE
LOGIC,
LATCH
&
THREE
STATE
OUTPUT
BUFFER
–V
REF
GND
PIN CONNECTIONS
24-Pin DIP
A IN 4
A IN 3
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
24-Pin SOIC
24-Pin SSOP
V
CC
A IN 4
SH/TH
IN 3
A
A0
A IN 2
A1
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
SH/TH
A0
A1
DB7
DB6
DB5
DB4
CS
WR/RDY
+V
REF
–V
REF
–V
REF
A IN 1
A IN 2
A IN 3
A IN 4
4-CH
MUX
SAMPLE
&
HOLD
–
+
+V
REF
–V
REF
+V
REF
16
A IN 2
A IN 1
MODE
DB0
DB1
DB2
DB3
RD
INT
GND
A IN 1
DB7
MODE
DB6
DB5
DB4
CS
4-BIT
D/A
DB0
DB1
DB2
Σ
–V
REF
16
4-BIT
FLASH
A/D
(LSB)
TIMING
&
CONTROL
INT
DB3
WR/RDY
RD
+V
REF
INT
–V
REF
GND
ADDRESS
LATCH
DECODE
A0
A1
TOP VIEW
TOP VIEW
CS WR/RDY RD SH/TH MODE
*This Part Is End Of Life As Of August 1, 2000
1
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
