Micro Linear Corporation ML2264CCS, ML2264CCP, ML2264CCR Datasheet

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 VCC.

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

■ 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

BLOCK DIAGRAM

VCC+V

A IN 1
A IN 2
A IN 3
A IN 4

4-CH
MUX

ADDRESS

LATCH

DECODE

A0 A1

SAMPLE

&

HOLD

PIN CONNECTIONS

–V

REF

SH/TH

+V

REF

4-BIT

FLASH

A/D

(MSB)

–V

REF

+V

REF

4-BIT

–V

–

+

Σ

–V

D/A

REF

+V

REF

16

4-BIT

FLASH

A/D

REF

(LSB)

16

TIMING

CONTROL

INT CS WR/RDY RD SH/TH MODE

REF

&

GND

DECODE

LOGIC,

LATCH

THREE

OUTPUT

BUFFER

&

STATE

DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0

A IN 4
A IN 3
A IN 2
A IN 1

MODE

DB0
DB1
DB2
DB3

RD

INT

GND

24-Pin DIP 24-Pin SOIC

24-Pin SSOP

1

2

3

4

5

6

7

8

9

10

11

12

TOP VIEW

24

23

22

21

20

19

18

17

16

15

14

13

V

CC

A IN 4

SH/TH

A IN 3

A0

A IN 2

A1

A IN 1

DB7

MODE

DB6
DB5
DB4
CS
WR/RDY
+V

REF

–V

REF

GND

DB0
DB1
DB2
DB3

RD

INT

1

2

3

4

5

6

7

8

9

10

11

12

TOP VIEW

*This Part Is End Of Life As Of August 1, 2000

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

1

ML2264

PIN DESCRIPTION

PIN# NAME FUNCTION PIN# NAME FUNCTION

1 A IN 4 Analog input 4.
2 A IN 3 Analog input 3.
3 A IN 2 Analog input 2.
4 A IN 1 Analog input 1.
5 MODE Mode select input.

MODE = GND: RD mode

MODE = VCC: WR-RD mode
Pin has internal current source
pulldown to GND.

6 DB0 Data output — bit 0 (LSB).
7 DB1 Data output — bit 1.
8 DB2 Data output — bit 2.
8 DB3 Data output — bit 3.

10 RD Read input. In RD mode, this pin

initiates a conversion. In WR-RD
mode, this pin latches data into output
latches. See Digital Interface section.

11 INT Interrupt output. This output signals

the end of a conversion and indicates
that data is valid on the data outputs.
See Digital Interface section.

12 GND Ground.
13 –V

REF

Negative reference voltage for
A/D converter.

15 WR/RDY Write input or ready output. In WR-RD

mode, this pin is WR input. In RD
mode, this pin is RDY open drain
output. See Digital Interface section.

16 CS Chip select input. This pin must be

held low for the device to perform a

conversion.
17 DB4 Data output — bit 4.
18 DB5 Data output — bit 5.
19 DB6 Data output — bit 6.
20 DB7 Data output — bit 7 (MSB).
21 A1 Digital address input 1 that selects

analog input channel. See multiplexer

addressing section.
22 A0 Digital address input 0 that selects

analog input channel. See multiplexer

addressing section.
23 SH/TH S/H, T/H mode select. When SH/TH =

VCC, the device is in sample and hold

mode. When SH/TH = GND, the

device is in track and hold mode. Pin

has internal pulldown current source

to GND.
24 V

CC

Positive supply. +5 volts ± 5%.

14 +V

REF

Positive reference voltage for
A/D converter.

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, VCC................................................. 6.5V

Voltage

Logic Inputs ................................. –0.3V to VCC + 0.3V

Analog Inputs .............................. –0.3V to VCC + 0.3V

Input Current per Pin (Note 2) .............................. ±25mA

Storage Temperature .............................. –65°C to +150°C

Package Dissipation

at TA = 25°C (Board Mount) .............................875mW

Lead Temperature (Soldering 10 sec.)

Dual-In-Line Package (Plastic)............................ 260°C

Dual-In-Line Package (Ceramic)......................... 300°C

SOIC

Vapor Phase (60 sec.) ..................................... 215°C

Infrared (15 sec.) ............................................ 220°C

OPERATING CONDITIONS

Supply Voltage, VCC............................ 4.5VDC to 6.0V

Temperature Range (Note 3) ................. T

ML2264CCS
ML2264CCP

ML2264CCR ........................................... 0°C to +70°C

MIN

- TA - T

DC

MAX

2

ML2264

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, TA = T

PARAMETER NOTES CONDITIONS MIN (NOTE 3) MAX UNITS
Converter

Total Unadjusted Error

ML2264CXX 4, 6 ±1 LSB

Integral Linearity Error

ML2264CXX 4, 6 ±1 LSB

Differential Linearity Error

ML2264CXX 4 ±1 LSB

Full Scale Error

ML2264CXX 4 ±1 LSB

Zero Scale Error

ML2264CXX 4 ±1 LSB
Channel to Channel Mismatch 4 ±1/4 LSB
+V

Voltage Range 5 –V

REF

–V

Voltage Range 5 GND–0.1 +V

REF

Reference Input Resistance 4 1 2.5 4 k ý
Analog Input Range 4, 7 GND–0.1 VCC+0.1 V
Power Supply Sensitivity 4 DC ±1/32 ±1/4 LSB

Analog Input Leakage Current, 4 ON Channel = V
OFF Channel OFF Channel = 0V

Analog Input Leakage Current, 4 ON Channel = 0V –1 µA
ON Channel OFF Channel = V

Analog Input Capacitance During Acquisition Period 45 pF

Digital and DC

V

, Logical “1” Input Voltage 4 WR, RD, CS, A0, A1 2.0 V

IN(1)

V

, Logical “0” Input Voltage 4 WR, RD, CS, A0, A1 0.8 V

IN(0)

I

, Logical “1” Input Current 4 VIH = V

IN(1)

I

, Logical “0” Input Current 4 VIL = GND WR, RD, CS –1 µA

IN(0)

MIN

to T

, VCC = +V

MAX

= 5V ± 5%, and –V

REF

= GND (Note 1)

REF

ML2264XCX

TYP

VCC+0.1 V

V

=5V ± 5%, V

CC

REF

REF

= 4.50V

100mVp-p ±1/16 LSB
100kHz sine on VCC, VIN = 0

CC

–1 µA

ON Channel = 0V 1 µA
OFF Channel = V

ON Channel = V

CC

CC

CC

OFF Channel = 0V

MODE, SH/TH VCC–0.5 V

MODE, SH/TH 0.5 V

CC

WR, RD, CS, A0, A1 1 µA
MODE, SH/TH 15 50 150 µA

MODE, SH/TH –20 µA

REF

V

1µA

3

ML2264

ELECTRICAL CHARACTERISTICS (Continued)

Unless otherwise specified, TA = T
CL = 100pF. (Note 1)

PARAMETER NOTES CONDITIONS MIN (NOTE 3) MAX UNITS
Digital and DC (Continued)

V
Output Voltage

V
Output Voltage

I
Current

C
Capacitance

C
Capacitance

I

AC and Dynamic Performance (Note 9)

t
Read Mode

t
Write-Read Mode Edge to INT,

SNR, Signal to Noise Ratio VIN = 5V, 250kHz 48 dB

HD, Harmonic Distortion V

IMD, Intermodulation Distortion fa = 2.5V, 250kHz –60 dB

FR, Frequency Response V

SR, Slew Rate Tracking 5 SH/TH = V

t
Setup Time (Track & Hold Operation)

, Logical “1” 4 I

OUT(1)

, Logical “0” 4 I

OUT(0)

, Three-State Output 4 V

OUT

, Logic Output 5pF

OUT

, Logic Input 5pF

IN

, Supply Current 4 CS = WR = RD = “1”, 18 mA

CC

, Conversion Time, 4 RD to INT, MODE = 0V 1020 ns

CRD

, Conversion Time, 4, 8 WR Falling SH/TH = V

CWR-RD

, Multiplexer Address 4 SH/TH = GND, Figure 1 0 ns

AS

MIN

to T

, VCC = +V

MAX

= 5V ± 5%, and –V

REF

= GND, and timing measured at 1.4V,

REF

ML2264XCX

TYP

= –2mA 4.0 V

OUT

= 2mA 0.4 V

OUT

= 0V –1 µA

OUT

= V

V

OUT

CC

No Output Load

CC

< t

t

RD

MODE = V

, SH/TH = GND 830 ns

INT

CC

Noise is sum of all nonfundamental
components from 0–500kHz.
SH/TH = V
f

SAMPLING

= 5V, 250kHz –63 dB

IN

, MODE = V

CC

= 1.0 MHz

CC

THD is sum of 2–5th harmonics relative to
fundamental.
SH/TH = V
f

SAMPLING

, MODE = V

CC

= 1.0 MHz

CC

fb = 2.5V, 248kHz
IMB is (fa + fb), (fa – fb), (2fa + fb), (2fa – fb),
(fa + 2fb), or (fa – 2fb) relative to fundamental.
SH/TH = V
f

SAMPLING

= 5V, 0–250kHz Relative to 1kHz ±0.1 dB

IN

SH/TH = V
f

SAMPLING

, MODE = V

CC

= 1.0 MHz

, MODE = V

CC

= 1.0 MHz

CC

CC

CC

SH/TH = GND 0.25 V/µs

1µA

700 ns

4.0 V/µs

4

ML2264

ELECTRICAL CHARACTERISTICS (Continued)

Unless otherwise specified, TA = T
CL = 100pF. (Note 1)

PARAMETER NOTES CONDITIONS MIN (NOTE 3) MAX UNITS
AC and Dynamic Performance (Note 9) (Continued)

t

, Multiplexer Address 4 SH/TH = GND, Figure 1 60 ns

AH

Hold Time (Track & Hold Operation)
t

, Multiplexer Address 4 SH/TH = VCC, Figure 2 225 ns

AS

Setup Time (Sample & Hold Operation)
t

, Multiplexer Address 4 SH/TH = VCC, Figure 2 60 ns

AH

Hold Time (Sample & Hold Operation)

AC Performance Read Mode (Pin 5 = 0V), Figure 4

t

, CS to RDY Delay 4 0 60 ns

RDY

t

, RD Low to RDY Delay 4, 9 Figure 3 1020 ns

RDD

t

, CS to RD, WR Setup Time 4 0 ns

CSS

t

, CS to RD, WR Hold Time 4 0 ns

CSH

t

, Conversion Time — 4, 9 1020 ns

CRD

RD Low to INT low
t

, Data Access Time 4 t

ACC0

RD to Data Valid
t

, RD Pulse Width 4 t

RDPW

t

, RD to INT Delay 4, 9 0 65 ns

INTH

t

, Data Hold Time — 5, 9 Figure 3 0 50 ns

DH

RD Rising Edge to Data
High Impedance State

t

, Delay Time Between 4, 9 Sample & Hold Mode, 300 ns

P

Conversions — INT Low SH/TH = V
to RD Low

AC Performance Write-Read Mode (Pin 5 = 5V), Figures 5 and 6

t

, CS to RD, WR Setup Time 4 0 ns

CSS

t

, CS to RD, WR Hold Time 4 0 ns

CSH

tWR, WR Pulse Width 4 SH/TH = V

t

, Read Time — WR 4tRD < t

RD

High to RD Low Delay
tRI, RD to INT Delay 4, 9 tRD < t
t

, Data Access Time 4 tRD < t

ACC1

— RD Low to Data Valid
t

— WR Falling Edge to INT Low

, Conversion Time 4, 8, 9 tRD < t

CWR-RD

MIN

to T

, VCC = +V

MAX

= 5V ± 5%, and –V

REF

= GND, and timing measured at 1.4V,

REF

ML2264XCX

TYP

CC

–10 t

CRD

+30 ns

CRD

+20 ns

CRD

Track & Hold Mode, 240 ns
SH/TH = GND

CC

190 50K ns

5 SH/TH = GND 320 50K ns

275 ns

0 235 ns
0 240 ns

700 ns

5, 8, 9 t

RD

INTL

INTL

INTL

, SH/TH = V

INTL

< t

, SH/TH = GND 830 ns

INTL

CC

5

ML2264

ELECTRICAL CHARACTERISTICS (Continued)

Unless otherwise specified, TA = T
CL = 100pF. (Note 1)

PARAMETER NOTES CONDITIONS MIN (NOTE 3) MAX UNITS
AC Performance Write-Read Mode (Pin 5 = 5V) Figures 5 and 6 (Continued)

t

, Internal Comparison 4, 9 tRD > t

INTL

Time — WR Rising Edge
to INT Low

, Data Access Time 4 tRD > t

t

ACC2

— RD to Data Valid

, Data Hold Time — 5, 9 Figure 3 0 50 ns

t

DH

RD Rising Edge to Data
High Impedance State

t

, RD to INT Delay 4, 9 0 65 ns

INTH

t

, Delay Time Between 4, 9 Sample & Hold Mode, 300 ns

P

Conversions — INT Low SH/TH = V
to WR Low

t

, WR to INT Delay 4, 9 Standalone Mode 0 90 ns

IHWR

tID, INTØ to Data Valid Delay 4, 9 Standalone Mode 0 20 ns

MIN

to T

, VCC = +V

MAX

= 5V ± 5%, and –V

REF

= GND, and timing measured at 1.4V,

REF

ML2264XCX

TYP

INTL

INTL

CC

050ns

Track & Hold Mode, 240 ns
SH/TH = GND

620 ns

Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions.
Note 2: When the voltage at any pin exceeds the power supply rails (V
Note 3: Typicals are parametric norm at 25°C.
Note 4: Parameter guaranteed and 100% production tested.
Note 5: Parameter guaranteed. Parameters not 100% tested are not in outgoing quality level calculation.
Note 6: Total unadjusted error includes offset, full scale, linearity, sample and hold, and multiplexer errors. Total unadjusted error is tested at the minimum specified times

for WR, RD, t
(cycle time of 1000ns).

Note 7: For –V

diode drop below ground or one diode drop greater than the V
cause this input diode to conduct — especially at elevated temperatures, and cause errors for analog inputs near full scale. The spec allows 100mV forward bias of
either diode. This means that as long as the analog V
an absolute 0V

loading.
Note 8: Conversion time, write-read mode = t
Note 9: Defined from the time an output crosses 0.8V or 2.4V.

, and tP. For example, for the ML2264XCX in the sample and hold mode, WR/RD mode: tWR = 190ns, tRD = 275ns with a frequency of 1.000MHz

R1

• VIN the digital output code will be 0000 0000. Two on-chip diodes are tied to the analog input which will forward conduct for analog input voltages one

REF

to 5VDC input voltage range will therefore require a minimum supply voltage of 4.900VDC over temperature variations, initial tolerance and

DC

+ tRD + tRI.

WR

IN

< GND or VIN > VCC) the absolute value of current at that pin should be limited to 25mA or less.

IN

supply. Be careful, during testing at low VCC levels (4.5V), as high level analog inputs (5V) can

CC

or V

does not exceed the supply voltage by more than 100mV, the output code will be correct. To achieve

REF

6