Maxim MAX1109CUB, MAX1108EUB, MAX1108CUB, MAX1109EUB Datasheet

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General Description

The MAX1108/MAX1109 low-power, 8-bit, dual-channel, analog-to-digital converters (ADCs) feature an internal track/hold (T/H) voltage reference, clock, and serial interface. The MAX1108 is specified from +2.7V to +3.6V and consumes only 105µA. The MAX1109 is specified from +4.5V to +5.5V and consumes only 130µA. The analog inputs are software configurable, allowing unipolar/bipolar and single-ended/differential operation; battery monitoring capability is also included.

The full-scale analog input range is determined by the internal reference of +2.048V (MAX1108) or +4.096V (MAX1109), or by an externally applied reference ranging from 1V to VDD. The MAX1108/MAX1109 also feature a software power-down mode that reduces power consumption to 0.5µA when the device is not in use. The 4-wire serial interface directly connects to SPI™, QSPI™, and MICROWIRE™ devices without external logic. Conversions up to 50ksps are performed using either the internal clock or an external serial-interface clock.

The MAX1108 and MAX1109 are available in a 10-pin µMAX package with a footprint that is just 20% of an 8-pin plastic DIP.

Applications

Portable Data Logging Hand-Held Measurement Devices Medical Instruments System Diagnostics Solar-Powered Remote Systems 4–20mA-Powered Remote Systems Receive-Signal Strength Indicators

Features

♦ Single Supply: +2.7V to +3.6V (MAX1108)

+4.5V to +5.5V (MAX1109)

♦ Low Power: 105µA at +3V and 50ksps

0.5µA in Power-Down Mode

♦ Software-Configurable Unipolar or Bipolar Inputs ♦ Input Voltage Range: 0 to V

♦ Internal Track/Hold ♦ Internal Reference: +2.048V (MAX1108)

+4.096V (MAX1109)

♦ Reference Input Range: 1V to V

♦ SPI/QSPI/MICROWIRE-Compatible Serial Interface ♦ V

Monitoring Mode

♦ Small 10-Pin µMAX Package

MAX1108/MAX1109

Single-Supply, Low-Power,

2-Channel, Serial 8-Bit ADCs

________________________________________________________________

Maxim Integrated Products

1 2 3 4 5

9 8 7 6

SCLK DOUT DIN CSGND

CH1

CH0

MAX1108 MAX1109

µMAX

TOP VIEW

COMREF

Functional Diagram

19-1399; Rev 0; 10/98

Pin Configuration

Ordering Information

PART

MAX1108CUB

MAX1108EUB -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

10 µMAX

10 µMAX MAX1109CUB MAX1109EUB -40°C to +85°C

0°C to +70°C 10 µMAX

10 µMAX

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

SCLK

OUTPUT

SHIFT

DIN

INPUT SHIFT

DOUT

MAX1108 MAX1109

CONTROL

LOGIC

CH0 CH1

COM

REF

ANALOG

INPUT

MUX

REFERENCE

INTERNAL

OSCILLATOR

T/H

CHARGE

REDISTRIBUTION

DAC

SAR

GND

MAX1108/MAX1109

Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—MAX1108

(VDD= +2.7V to +3.6V; unipolar input mode; COM = GND, f

SCLK

= 500kHz, external clock mode (50% duty cycle); 10 clocks/conver-

sion cycle (50ksps); 1µF capacitor at REF, external +2.048V reference at REF; T

= T

MIN

to T

MAX

; unless otherwise noted. Typical

values are at T

= +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, COM, REF, DOUT to GND.......-0.3V to (V

+ 0.3V)

DIN, SCLK,

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

Continuous Power Dissipation (T

= +70°C)

10-pin µMAX (derate 5.6mW/°C above +70°C)............444mW

Operating Temperature Ranges

MAX110_CUB......................................................0°C to +70°C

MAX110_EUB ...................................................-40°C to +85°C

Storage Temperature Range.............................-65°C to +150°C

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

= 2.7V to 3.6V VDD= 5.5V (Note 2) No missing codes over temperature

CONDITIONS

±0.15 ±0.5

bits8Resolution

LSB

±0.2

INLRelative Accuracy (Note 1)

LSB±1DNLDifferential Nonlinearity

UNITSMIN TYP MAXSYMBOLPARAMETER

VDD= 5.5V (Note 2)

VDD= 2.7V to 3.6V

LSB

±0.5

Offset Error

±0.2 ±1

LSB±1Gain Error (Note 3)

ppm/°C±0.8Gain Temperature Coefficient

TA= T

MIN

to T

MAX

TA= +25°C

mV50V

/ 2 Sampling Accuracy

dB49SINADSignal-to-Noise Plus Distortion dB-70THD

Total Harmonic Distortion (up to the 5th harmonic)

LSB

±0.5

TUETotal Unadjusted Error

±1

LSB±0.1

Channel-to-Channel Offset Matching

-3dB rolloff

Unipolar input, V

COM

= 0

MHz0.8Full-Power Bandwidth

MHz1.5BW

-3dB

Small-Signal Bandwidth

0 V

REF

Input Voltage Range (Note 4)

dB68SFDRSpurious-Free Dynamic Range

Bipolar input, V

COM

or V

CH1

= V

REF

/ 2,

referenced to COM or CH1

±V

REF

/ 2

CH_

pF18C

Input Capacitance

On/off-leakage current, V

COM

or VCH= 0 or V

µA±0.01 ±1Multiplexer Leakage Current

DC ACCURACY

DYNAMIC PERFORMANCE (10kHz sine-wave input, 2.048Vp-p, 50ksps, 500kHz external clock)

ANALOG INPUTS

µA

MAX1108/MAX1109

Single-Supply, Low-Power,

2-Channel, Serial 8-Bit ADCs

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS—MAX1108 (continued)

(VDD= +2.7V to +3.6V; unipolar input mode; COM = GND, f

SCLK

= 500kHz, external clock mode (50% duty cycle); 10 clocks/conver-

sion cycle (50ksps); 1µF capacitor at REF, external +2.048V reference at REF; T

= T

MIN

to T

MAX

; unless otherwise noted. Typical

values are at T

= +25°C.)

CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER

External clock, 500kHz, 10 sclks/conv

Internal clock

External clock, 2MHz

µs

CONV

Conversion Time (Note 5)

µs1t

ACQ

Track/Hold Acquisition Time

ps<50Aperture Jitter

ns10Aperture Delay

kHz400Internal Clock Frequency

(Note 6)

0 to 0.5mA (Note 7)

ppm/°C±50REF Tempco

µA150I

REFSC

REF Short-Circuit Current

mV2.5Load Regulation

kHz50 500

V1.968 2.048 2.128V

REF

Output Voltage

+2.048V at REF, full scale, 500kHz external clock

µA1 20Input Current

V2.7 3 5.5V

Supply Voltage

Power down, VDD= 2.7V to 3.6V Full-scale input, VDD= 2.7V to 3.6V

0.5 2.5

mV±0.4 ±4PSRPower-Supply Rejection (Note 9)

VDD= 2.7V to 3.6V, C

= 10pF

VDD= 5.5V, C

= 10pF

105 250

130

µF1Capacitive Bypass at REF

V0.2V

HYST

Input Hysteresis

V0.8V

Threshold Voltage Low

µA±1I

Input Current High

VDD≤ 3.6V VDD> 3.6V

V2 V3

Threshold Voltage High

MHz2

External Clock Frequency Range

V1.0 VDD+ 0.05Input Voltage Range

µA±1I

Input Current Low

pF15C

Input Capacitance

For data transfer only

Internal reference External reference 70 Internal reference External reference 95

µASupply Current (Notes 2, 8)

TRACK/HOLD

INTERNAL REFERENCE

EXTERNAL REFERENCE

POWER REQUIREMENTS

DIGITAL INPUTS (DIN, SCLK, and CS)

Wake-Up Time

MAX1108/MAX1109

Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs

4 _______________________________________________________________________________________

CS = V

pF15C

OUT

Three-State Output Capacitance

µA±0.01 ±10I

Three-State Leakage Current

Figure 1, C

LOAD

= 100pF

Figure 1, C

LOAD

= 100pF

Figure 2, C

LOAD

= 100pF

ns240t

CS Fall to Output Enable

CONDITIONS

20 200t

SCLK Fall to Output Data Valid

ns240t

CS Rise to Output Disable

ns100t

DIN to SCLK Setup Time

µs1.0t

ACQ

Acquisition Time

ns0t

DIN to SCLK Hold Time

External reference Internal reference (Note 10)

µs20

ns200t

SCLK Pulse Width Low

ms12

WAKE

Wake-Up Time

ns0t

CSH

CS to SCLK Rise Hold

ns100t

CSS

CS to SCLK Rise Setup

ns200t

SCLK Pulse Width High

UNITSMIN TYP MAXSYMBOLPARAMETER

SINK

= 5mA

SOURCE

= 0.5mA

SINK

= 16mA

V0.4

VVDD- 0.5V

Output High Voltage

V0.8

Output Low Voltage

ELECTRICAL CHARACTERISTICS—MAX1108 (continued)

(VDD= +2.7V to +3.6V; unipolar input mode; COM = GND, f

SCLK

= 500kHz, external clock mode (50% duty cycle); 10 clocks/conver-

sion cycle (50ksps); 1µF capacitor at REF, external +2.048V reference at REF; T

= T

MIN

to T

MAX

; unless otherwise noted. Typical

values are at T

= +25°C.)

ELECTRICAL CHARACTERISTICS—MAX1109

(VDD= +4.5V to +5.5V; unipolar input mode; COM = GND, f

SCLK

= 500kHz, external clock (50% duty cycle); 10 clocks/conversion

cycle (50ksps); 1µF capacitor at REF, external +4.096V reference at REF; T

= T

MIN

to T

MAX

; unless otherwise noted. Typical values

are at T

= +25°C.)

VDD= 4.5V to 5.5V LSBOffset Error ±0.2 ±1

LSB±1

VDD= 4.5V to 5.5V No missing codes over temperature

Gain Error (Note 3)

ppm/°C±0.8

CONDITIONS

Gain Temperature Coefficient

TA= T

MIN

to T

MAX

TA= +25°C

mV50V

/ 2 Sampling Accuracy

LSB

±0.5

TUETotal Unadjusted Error

±1

LSB±0.1

Channel-to-Channel Offset Matching

±0.15 ±0.5

bits8Resolution LSBINLRelative Accuracy (Note 1) LSB±1DNLDifferential Nonlinearity

UNITSMIN TYP MAXSYMBOLPARAMETER

DIGITAL OUTPUT (DOUT)

TIMING CHARACTERISTICS (Figures 8, 9, and 10)

DC ACCURACY

MAX1108/MAX1109

Single-Supply, Low-Power,

2-Channel, Serial 8-Bit ADCs

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS—MAX1109 (continued)

(VDD= +4.5V to +5.5V; unipolar input mode; COM = GND, f

SCLK

= 500kHz, external clock (50% duty cycle); 10 clocks/conversion

cycle (50ksps); 1µF capacitor at REF, external +4.096V reference at REF; T

= T

MIN

to T

MAX

; unless otherwise noted. Typical values

are at T

= +25°C.)

ps<50Aperture Jitter

ns10Aperture Delay

kHz400Internal Clock Frequency

0 to 0.5mA (Note 7) ppm/°C±50REF Tempco

CONDITIONS

REFSC

REF Short-Circuit Current

mV2.5Load Regulation

kHz50 500

V3.936 4.096 4.256V

REF

Output Voltage

+4.096V at REF, full scale, 500kHz external clock

µA1 20Input Current

1.0 VDD+ 0.05Input Voltage Range

µF1Capacitive Bypass at REF

UNITSMIN TYP MAXSYMBOLPARAMETER

External clock, 2MHz

dBSINADSignal-to-Noise Plus Distortion 49

µs1t

ACQ

Track/Hold Acquisition Time

External clock, 500kHz, 10 sclks/conv

Internal clock

µs

CONV

Conversion Time (Note 5)

SFDRSpurious Free Dynamic Range dB

THD

Total Harmonic Distortion (up to the 5th harmonic)

-70

Full-Power Bandwidth MHz

Unipolar input, V

COM

= 0 0 V

REF

-3dB rolloff MHz

0.8

-3dB

Small-Signal Bandwidth 1.5

CH_

Input Voltage Range (Note 4) V

Multiplexer Leakage Current µA

On/off-leakage current, V

= 0 or V

±0.01 ±1

pFC

Input Capacitance 18

Bipolar input, V

COM

or V

CH1

= V

REF

/ 2,

referenced to COM or CH1

±V

REF

/ 2

MHz2

External Clock Frequency Range

DYNAMIC PERFORMANCE (10kHz sine-wave input, 4.096Vp-p, 50ksps, 500kHz external clock)

ANALOG INPUTS

TRACK/HOLD

EXTERNAL REFERENCE

INTERNAL REFERENCE

For data transfer only

µA

MAX1108/MAX1109

Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS—MAX1109 (continued)

(VDD= +4.5V to +5.5V; unipolar input mode; COM = GND, f

SCLK

= 500kHz, external clock (50% duty cycle); 10 clocks/conversion

cycle (50ksps); 1µF capacitor at REF, external +4.096V reference at REF; T

= T

MIN

to T

MAX

; unless otherwise noted. Typical values

are at T

= +25°C.)

CS = V

pF15C

OUT

Three-State Output Capacitance

µA±0.01 ±10I

Three-State Leakage Current

Figure 1, C

LOAD

= 100pF

Figure 1, C

LOAD

= 100pF

Figure 2, C

LOAD

= 100pF

ns240t

CS Fall to Output Enable

CONDITIONS

20 200t

SCLK Fall to Output Data Valid

ns240t

CS Rise to Output Disable

ns100t

DIN to SCLK Setup Time

µs1.0t

ACQ

Acquisition Time

ns0t

DIN to SCLK Hold Time

UNITSMIN TYP MAXSYMBOLPARAMETER

SINK

= 5mA

SINK

= 16mA

0.4

V4.5 5 5.5V

Supply Voltage

0.8

Output Low Voltage

VDD= 4.5V to 5.5V, C

= 10pF,

full-scale input

130 250

Power down, VDD= 4.5V to 5.5V 0.5 2.5

External reference = +4.096V, full-scale input, V

= 4.5V to 5.5V

mV±0.4 ±4PSRPower-Supply Rejection (Note 9)

V0.2V

HYST

Input Hysteresis

V0.8V

Threshold Voltage Low

V3V

Threshold Voltage High

µA±1I

Input Current High

pF15C

Input Capacitance

SOURCE

= 0.5mA VVDD- 0.5V

Output High Voltage

µA±1I

Input Current Low

µASupply Current (Notes 2, 8)

Internal reference External reference

POWER REQUIREMENTS

DIGITAL INPUTS (DIN, SCLK, and CS)

DIGITAL OUTPUT (DOUT)

TIMING CHARACTERISTICS (Figures 8, 9, and 10)

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