MAX148/MAX149

+2.7V to +5.25V, Low-Power, 8-Channel,

Serial 10-Bit ADCs

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

= +2.7V to +5.25V; COM = 0V; f

SCLK

= 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps);

MAX149—4.7µF capacitor at VREF pin; MAX148—external reference, VREF = 2.500V applied to VREF pin; T

= T

MIN

to T

MAX

; unless

otherwise noted.)

3.0

DIN, SCLK, CS Input High Voltage

> 3.6V

mV±0.3PSRSupply Rejection (Note 12)

Full-scale input, external reference = 2.500V,

= 2.7V to 5.25V

pF15C

DIN, SCLK, CS Input Capacitance

µA±0.01 ±1I

DIN, SCLK, CS Input Leakage

V0.2V

HYST

DIN, SCLK, CS Input Hysteresis

V0.8V

DIN, SCLK, CS Input Low Voltage

2.0

µA±4.0I

SHDN Input Current

V0.4V

SHDN Input Low Voltage

- 0.4V

SHDN Input High Voltage

SHDN = 0V or V

nA±100

SHDN Maximum Allowed

Leakage, Mid Input

/ 2V

FLT

SHDN Voltage, Floating

SHDN = FLOAT

UNITSMIN TYP MAXSYMBOLPARAMETER

(Note 10)

= 0V or V

≤ 3.6V

CONDITIONS

µA±0.01 ±10I

Three-State Leakage Current

- 0.5V

Output Voltage High

0.8

Output Voltage Low

0.4

pF15C

OUT

Three-State Output Capacitance

CS = V

(Note 10)

CS = V

SOURCE

= 0.5mA

SINK

= 16mA

SINK

= 5mA

2.70 5.25

1.2 2.0

Operating mode,

full-scale input (Note 11)

3.5 15

Full power-down

1.2 10

1.6 3.0

V1.1 V

- 1.1V

SHDN Input Mid Voltage

Positive Supply Current

Positive Supply Voltage V

µA

30 70

DIGITAL INPUTS (DIN, SCLK, CS, SHDN)

DIGITAL OUTPUTS (DOUT, SSTRB)

POWER REQUIREMENTS

Fast power-down (MAX149)I

= 5.25V

= 3.6V

= 5.25V

= 3.6V

MAX148/MAX149

+2.7V to +5.25V, Low-Power, 8-Channel,

Serial 10-Bit ADCs

_______________________________________________________________________________________ 5

Figure 1

__________________________________________Typical Operating Characteristics

= 3.0V, VREF = 2.500V, f

SCLK

= 2.0MHz, C

LOAD

= 20pF, T

= +25°C, unless otherwise noted.)

0 256 512 768 1024

INTEGRAL NONLINEARITY

vs. CODE

0.10

0.05

-0.10

-0.05

MAX148/9-01

CODE

INL (LSB)

0.125

2.25 2.75 4.25

INTEGRAL NONLINEARITY

vs. SUPPLY VOLTAGE

0.100

0.075

0.050

0.025

SUPPLY VOLTAGE (V)

INL (LSB)

3.75 5.253.25 4.75

MAX148/9-02

MAX149

MAX148

0.025

0.050

0.075

0.100

0.125

-60 -20 20 60 100 140

INTEGRAL NONLINEARITY

vs. TEMPERATURE

TEMPERATURE

(°C)

INL (LSB)

MAX148/9-03

MAX148

MAX149

= 2.7V

TIMING CHARACTERISTICS

= +2.7V to +5.25V, T

= T

MIN

to T

MAX

, unless otherwise noted.)

Note 1: Tested at V

= 2.7V; COM = 0V; unipolar single-ended input mode.

Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range has

been calibrated.

Note 3: MAX149—internal reference, offset nulled; MAX148—external reference (VREF = +2.500V), offset nulled.

Note 4: Ground “on” channel; sine wave applied to all “off” channels.

Note 5: Conversion time defined as the number of clock cycles multiplied by the clock period; clock has 50% duty cycle.

Note 6: The common-mode range for the analog inputs is from AGND to V

Note 7: Sample tested to 0.1% AQL.

Note 8: External load should not change during conversion for specified accuracy.

Note 9: ADC performance is limited by the converter’s noise floor, typically 300µVp-p.

Note

10:

Guaranteed by design. Not subject to production testing.

Note

11:

The MAX148 typically draws 400µA less than the values shown.

Note

12:

Measured as

(2.7V) - V

(5.25V)

Internal clock mode only (Note 7)

External clock mode only, Figure 2

External clock mode only, Figure 1

DIN to SCLK Setup

Figure 1

Figure 2

Figure 1

MAX14_ _C/E

CONDITIONS

MAX14_ _M

20 240

Figure 1

CSH

ns240t

STR

CS Rise to SSTRB Output Disable

ns240t

SDV

CS Fall to SSTRB Output Enable

240t

SSTRB

SCLK Fall to SSTRB ns

200t

SCLK Pulse Width Low

ns200SCLK Pulse Width High

ns0

CS to SCLK Rise Hold

ns100t

CSS

CS to SCLK Rise Setup

ns240t

CS Rise to Output Disable

ns240t

CS Fall to Output Enable

20 200

SCLK Fall to Output Data Valid

ns0t

DIN to SCLK Hold

µs1.5t

ACQ

Acquisition Time

SCK

SSTRB Rise to SCLK Rise

ns100t

UNITSMIN TYP MAXSYMBOLPARAMETER

MAX148/MAX149

+2.7V to +5.25V, Low-Power, 8-Channel,

Serial 10-Bit ADCs

6 _______________________________________________________________________________________

2.00

0.50

2.25 2.75

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

1.75

1.25

1.50

1.00

0.75

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

3.75 5.253.25 4.25 4.75

MAX148/9-04

= ∞

CODE = 1010101000

LOAD

= 50pF

MAX148

MAX149

LOAD

= 20pF

2.25 2.75

SHUTDOWN SUPPLY CURRENT

vs. SUPPLY VOLTAGE

3.0

2.5

1.5

2.0

1.0

0.5

SUPPLY VOLTAGE

(V)

SHUTDOWN SUPPLY CURRENT (µA)

3.75 5.253.25 4.25 4.75

MAX148/9-05

FULL POWER-DOWN

2.5020

2.4990

2.25 2.75

MAX149

INTERNAL REFERENCE VOLTAGE

vs. SUPPLY VOLTAGE

2.5015

2.5005

2.5010

2.5000

2.4995

SUPPLY VOLTAGE

(V)

INTERNAL REFERENCE VOLTAGE (V)

3.75 5.253.25 4.25 4.75

MAX148/9-06

0.8

0.9

1.0

1.1

1.2

1.3

-60 -20 20 60 100 140

SUPPLY CURRENT vs. TEMPERATURE

TEMPERATURE

(°C)

SUPPLY CURRENT (mA)

MAX148/9-07

MAX148

MAX149

LOAD

= ∞

CODE = 1010101000

0.4

0.8

1.2

1.6

2.0

-60 -20 20 60 100 140

SHUTDOWN CURRENT

vs. TEMPERATURE

TEMPERATURE

(°C)

SHUTDOWN CURRENT (µA)

MAX148/9-08

2.494

2.495

2.496

2.497

2.498

2.499

2.500

2.501

-60 -20 20 60 100 140

MAX149

INTERNAL REFERENCE VOLTAGE

vs. TEMPERATURE

TEMPERATURE

(°C)

INTERNAL REFERENCE VOLTAGE (V)

MAX148/9-09

= 2.7V

= 3.6V

= 5.25V

____________________________Typical Operating Characteristics (continued)

= 3.0V, VREF = 2.500V, f

SCLK

= 2.0MHz, C

LOAD

= 20pF, T

= +25°C, unless otherwise noted.)

Part #	MAX149AEAP
Description	+2.7V TO +5.25V LOW-POWER 8-CHANNEL SERIAL 10-BIT ADCS - B
Category	CONVERTER
Availability	In Stock
Qty	63

Qty	Price
1 - 13	$12.41688
14 - 26	$9.87707
27 - 39	$9.31266
40 - 52	$8.65419
53 +	$7.71352

MAX149AEAP

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Technical Document