Maxim MAX159BMJA, MAX157BEUA, MAX157BEPA, MAX157AMJA, MAX157AEUA Datasheet

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General Description

The MAX157/MAX159 low-power, 10-bit analog-to-digi­tal converters (ADCs) are available in 8-pin µMAX and
DIP packages. Both devices operate with a single
+2.7V to +5.25V supply and feature a 7.4µs succes­sive-approximation ADC, automatic power-down, fast
wake-up (2.5µs), an on-chip clock, and a high-speed,
3-wire serial interface.

Power consumption is only 3.2mW (VDD= +3.6V) at the
maximum sampling rate of 108ksps. At slower through­put rates, the 0.2µA automatic shutdown further
reduces power consumption.

The MAX157 provides 2-channel, single-ended opera­tion and accepts input signals from 0 to V

REF

. The
MAX159 accepts pseudo-differential inputs ranging
from 0 to V

REF

. An external clock accesses data
through the 3-wire serial interface, which is SPI™,
QSPI™, and MICROWIRE™ compatible.

Excellent dynamic performance and low power, com­bined with ease of use and a small package size, make
these converters ideal for battery-powered and data
acquisition applications, or for other circuits with
demanding power-consumption and space require­ments. For pin-compatible 12-bit upgrades, see the
MAX144/MAX145 data sheet.

Applications

Battery-Powered Systems Instrumentation
Portable Data Logging Test Equipment
Isolated Data Acquisition Medical Instruments
Process-Control Monitoring System Supervision

Features

♦ Single-Supply Operation (+2.7V to +5.25V)
♦ Two Single-Ended Channels (MAX157)

Single Pseudo-Differential Channel (MAX159)

♦ Low Power

0.9mA (at 108ksps, +3V)
100µA (at 10ksps, +3V)
10µA (at 1ksps, +3V)
<0.2µA (power-down mode)

♦ Internal Track/Hold
♦ 108ksps Sampling Rate
♦ SPI/QSPI/MICROWIRE-Compatible 3-Wire

Serial Interface

♦ Space-Saving 8-Pin µMAX Package
♦ Pin-Compatible 12-Bit Upgrades Available

MAX157/MAX159

+2.7V, Low-Power, 2-Channel,

108ksps, Serial 10-Bit ADCs in 8-Pin µMAX

________________________________________________________________

Maxim Integrated Products

1

CS/SHDN

REFGND

1
2

87SCLK

DOUT

( ) ARE FOR MAX159 ONLY.

CH0 (CH+)

CH1 (CH-)

V

DD

µMAX/DIP

TOP VIEW

3

4

6

5

MAX157
MAX159

19-1388; Rev 0; 11/98

Pin Configuration

Ordering Information

SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.

*

Contact factory for availability.

±18 CERDIP*-55°C to +125°CMAX159BMJA

±0.58 CERDIP*-55°C to +125°CMAX159AMJA

±18 Plastic DIP-40°C to +85°CMAX159BEPA

±0.58 Plastic DIP-40°C to +85°CMAX159AEPA

±18 µMAX-40°C to +85°CMAX159BEUA

±1

±0.5

±1

±0.5

±1

±0.5

±1

±0.5

±1

±0.5

±0.5

±1

±0.5

±1

±0.5

INL

(LSB)

8 CERDIP*

8 CERDIP*

8 Plastic DIP-40°C to +85°C

-55°C to +125°C

-55°C to +125°CMAX157BMJA

MAX157AMJA

MAX157BEPA

8 Plastic DIP

8 µMAX-40°C to +85°C

-40°C to +85°CMAX157AEPA

MAX157BEUA

8 µMAX

8 Plastic DIP0°C to +70°C

-40°C to +85°CMAX159AEUA

MAX159BCPA

8 Plastic DIP

8 µMAX

8 µMAX0°C to +70°C
0°C to +70°C
0°C to +70°CMAX159ACPA

MAX159BCUA

MAX159ACUA

8 µMAX

8 Plastic DIP0°C to +70°C

-40°C to +85°CMAX157AEUA

MAX157BCPA

8 Plastic DIP

8 µMAX

8 µMAX

PIN-

PACKAGE

TEMP.

RANGE

0°C to +70°C
0°C to +70°C
0°C to +70°CMAX157ACPA

MAX157BCUA

MAX157ACUA

PART

MAX157/MAX159

+2.7V, Low-Power, 2-Channel,
108ksps, Serial 10-Bit ADCs in 8-Pin µMAX

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= +2.7V to +5.25V, V

REF

= 2.5V, 0.1µF capacitor at REF, f

SCLK

= 2.17MHz, 16 clocks/conversion cycle (108ksps),

CH- = GND for MAX159, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

VDDto GND..............................................................-0.3V to +6V

CH0, CH1 (CH+, CH-) to GND...................-0.3V to (VDD+ 0.3V)

REF to GND................................................-0.3V to (VDD+ 0.3V)

Digital Inputs to GND ...............................................-0.3V to +6V

DOUT to GND.............................................-0.3V to (VDD+ 0.3V)

DOUT Sink Current ............................................................ 25mA

Continuous Power Dissipation (TA= +70°C)

µMAX (derate 4.1mW/°C above +70°C) ......................330mW

Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW

CERDIP (derate 8.00mW/°C above +70°C).................640mW

Operating Temperature Ranges

MAX157/MAX159_C_A .......................................0°C to +70°C

MAX157/MAX159_E_A ....................................-40°C to +85°C

MAX157/MAX159_MJA................................. -55°C to +125°C

Storage Temperature Range.............................-60°C to +150°C

Lead Temperature (soldering, 10sec).............................+300°C

DC ACCURACY (Note 1)

DYNAMIC SPECIFICATIONS (f

IN

(sine wave) = 10kHz, VIN= 2.5Vp-p, 108ksps, external f

SCLK

= 2.17MHz, CH- = GND for MAX159)

PARAMETER SYMBOL MIN TYP MAX UNITS

Gain Error (Note 3)

±2

LSB

Offset Error

±2

LSB

Differential Nonlinearity DNL

±0.5

LSB

±1

Gain Temperature Coefficient

±0.8

ppm/°C

Channel-to-Channel Offset
Matching

±0.02

LSB

Channel-to-Channel Gain
Matching

±0.02

LSB

Resolution RES

10

Bits

Relative Accuracy (Note 2) INL

±0.5

LSB

Signal-to-Noise Ratio plus
Distortion

SINAD

66

dB

Total Harmonic Distortion
(including 5th-order harmonic)

THD

-70

dB

Spurious-Free Dynamic Range SFDR

70

dB

Channel-to-Channel Crosstalk

-75

dB

Small-Signal Bandwidth

2.25

MHz

Full-Power Bandwidth

1.0

MHz

CONDITIONS

No missing codes over temperature

MAX15_B

External reference, V

REF

= 2.5V

fIN= 65kHz, VIN= 2.5Vp-p (Note 4)

-3dB rolloff

MAX15_A

MHz

+2.7V, Low-Power, 2-Channel,

108ksps, Serial 10-Bit ADCs in 8-Pin µMAX

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +2.7V to +5.25V, V

REF

= 2.5V, 0.1µF capacitor at REF, f

SCLK

= 2.17MHz, 16 clocks/conversion cycle (108ksps),

CH- = GND for MAX159, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

CONVERSION RATE

0.5

I

SINK

= 16mA

Three-State Output Capacitance

15

pFC

OUT

CS/SHDN = VDD(Note 8)

Output High Voltage

VDD- 0.5

VV

OH

Output Low Voltage

0.4
VV

OL

I

SINK

= 5mA

I

SOURCE

= 0.5mA

Input Capacitance

15

pFC

IN

Input Leakage Current

±1

µAI

IN

VIN= 0 or V

DD

(Note 8)

Input Hysteresis

0.2

VV

HYS

V

V

3.0

VDD> 3.6V

Input Low Voltage

0.8

V

IL

Input High Voltage

2.0

V

IH

VDD≤ 3.6V

Shutdown REF Input Current

0.01 10

µA

Input Resistance

18 25

kΩ

Input Current

100 140

µAV

REF

= 2.5V

Input Voltage Range (Note 7)

0 V

DD

+ 50mV

VV

REF

Analog Input Voltage Range
(Note 6)

0V

REF

VV

IN

Input Capacitance

16

µAC

IN

Multiplexer Leakage Current

±0.01 ±1

µAOn/off-leakage current, VIN= 0 to V

DD

Aperture Delay

25

ns

Aperture Jitter

<50

ps

Serial Clock Frequency

0.1 2.17

f

SCLK

05

MHz

External clock mode
Internal clock mode, for data transfer only

PARAMETER SYMBOL MIN TYP MAX UNITS

7.4
µsConversion Time (Note 5) t

CONV

5 7

T/H Acquisition Time t

ACQ

2.5

µs

CONDITIONS

External clock, f

SCLK

= 2.17MHz, 16 clock

cycles per conversion
Internal clock

Three-State Output Leakage
Current

±10

µA

CS/SHDN = V

DD

CONVERSION RATE

ANALOG INPUTS

EXTERNAL REFERENCE

DIGITAL INPUTS (CS/SHDN, SCLK) AND DIGITAL OUTPUT (DOUT)

MAX157/MAX159

MAX157/MAX159

+2.7V, Low-Power, 2-Channel,
108ksps, Serial 10-Bit ADCs in 8-Pin µMAX

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +2.7V to +5.25V, V

REF

= 2.5V, 0.1µF capacitor at REF, f

SCLK

= 2.17MHz, 16 clocks/conversion cycle (108ksps),

CH- = GND for MAX159, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

TIMING CHARACTERISTICS (Figure 7)

(VDD= +2.7V to +5.25V, V

REF

= 2.5V, 0.1µF capacitor at REF, f

SCLK

= 2.17MHz, 16 clocks/conversion cycle (108ksps),

CH- = GND for MAX159, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

Note 1: Tested at V

DD

= +2.7V.

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

calibrated.

Note 3: Offset nulled.
Note 4: The on channel is grounded; the sine wave is applied to off channel (MAX157 only).
Note 5: Conversion time is defined as the number of clock cycles times the clock period; clock has 50% duty cycle.
Note 6: The common-mode range for the analog inputs is from GND to V

DD

(MAX159 only).

Note 7: ADC performance is limited by the converter’s noise floor, typically 300µVp-p.
Note 8: Guaranteed by design. Not subject to production testing.
Note 9: Measured as V

FS

(2.7V) - VFS(5.25V).

PARAMETER SYMBOL MIN TYP MAX UNITS

05

SCLK Clock Frequency f

SCLK

0.1 2.17

MHz

SCLK Fall to Output Data Valid t

DO

20 120

ns

215

CS/SHDN Fall to Output Enable

Wake-Up Time t

WAKE

2.5

µs

t

DV

120

ns

CS/SHDN Rise to Output
Disable

t

TR

120

ns

SCLK Pulse Width High t

CH

50

ns

CONDITIONS

Internal clock, SCLK for data transfer only
(Note 8)

Internal clock, SCLK for data transfer only

External clock

CL= 100pF

External clock

CL= 100pF (Figure 1)
CL = 100pF (Figure 1)

ns

SCLK to CS/SHDN Setup

t

SCLKS

60

CS/SHDN Pulse Width

t

CS

60

ns

215

SCLK Pulse Width Low t

CL

50

ns

Internal clock, SCLK for data transfer only
(Note 8)

External clock

POWER REQUIREMENTS

Power-Supply Rejection
(Note 9)

PSR

±0.15

mVVDD= 2.7V to 5.25V, full-scale input

PARAMETER SYMBOL MIN TYP MAX UNITS

Positive Supply Voltage V

DD

+2.7 +5.25

V

CONDITIONS

Positive Supply Current I

DD

0.9 2.0

mAOperating mode

Positive Supply Current I

DD

0.2 5

µA

Shutdown, CS/SHDN = GND

POWER REQUIREMENTS

MAX157/MAX159

+2.7V, Low-Power, 2-Channel,

108ksps, Serial 10-Bit ADCs in 8-Pin µMAX

_______________________________________________________________________________________

5

500

700

900

1100

1300

1500

2.5 3.0 3.5 4.0 4.5 5.0 5.5

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX157/159 toc01

V

DD

(V)

SUPPLY CURRENT (µA)

V

REF

= V

DD

RL = ∞
C

L

= 50pF

CODE = 1010101000

500

750

1000

1250

1500

-60 -20 0-40 20 40 60 80 100 120 140

SUPPLY CURRENT

vs. TEMPERATURE

MAX157/159 toc02

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

V

REF

= V

DD

RL = ∞
C

L

= 50pF

CODE = 1010101000

10,000

0.1

0.1 1 100 1k

10k

10 100k

SUPPLY CURRENT

vs. SAMPLING RATE

1

MAX157/159 toc03

SAMPLING RATE (sps)

SUPPLY CURRENT (µA)

100

10

1000

V

REF

= VDD
CODE = 1010101000
C

L

= 50pF

0

400

200

600

800

1000

2.5 3.0 3.5 4.0 4.5 5.0 5.5

SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE

MAX157/159 toc04

V

DD

(V)

SHUTDOWN CURRENT (nA)

V

REF

= V

DD

0

0.05

0.10

0.15

0.20

-60 -10 40 90-35 15 65 140115

OFFSET ERROR vs. TEMPERATURE

MAX157/159 toc07

TEMPERATURE (°C)

OFFSET ERROR (LSB)

0

200

400

600

800

1000

-60 20 40-20 0-40 60 80 100 120 140

SHUTDOWN CURRENT

vs. TEMPERATURE

MAX157/159 toc05

TEMPERATURE (°C)

SHUTDOWN CURRENT (nA)

V

REF

= V

DD

0

0.05

0.10

0.15

0.20

2.5 3.0 3.5 4.0 4.5 5.0 5.5

OFFSET ERROR vs. SUPPLY VOLTAGE

MAX157/159 toc06

V

DD

(V)

OFFSET ERROR (LSB)

Typical Operating Characteristics

(VDD= +3.0V, V

REF

= 2.5V, 0.1µF capacitor at REF, f

SCLK

= 2.17MHz, 16 clocks/conversion cycle (108ksps); CH- = GND for

MAX159; TA = +25°C, unless otherwise noted.)