Datasheet

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General Description

The MAX1117/MAX1118/MAX1119 low-power, 8-bit,

dual-channel, analog-to-digital converters (ADCs) fea-

ture an internal track/hold (T/H) voltage reference

(MAX1117/MAX1119), clock, and serial interface. The

MAX1118 is specified from +2.7V to +5.5V and con-

sumes only 135µA at 100ksps. The MAX1117 is speci-

fied from +2.7V to +3.6V, and the MAX1119 is specified

from +4.5V to +5.5V, each consumes only 175µA at

100ksps.

The full-scale analog input range is determined by the

internal reference of +2.048V (MAX1117) or +4.096V

(MAX1119), or by an externally applied reference rang-

ing from +1V to V

(MAX1118). All devices feature an

automatic shutdown mode that reduces supply current

to <1µA when the device is not in use. The 3-wire serial

interface directly connects to SPI™, QSPI™, and

MICROWIRE™ devices without external logic.

Conversions up to 100ksps are performed using an

internal clock.

The MAX1117/MAX1118/MAX1119 are available in an

8-pin SOT23 package with a footprint that is only 11%

of an 8-pin plastic DIP.

________________________Applications

Low-Power, Handheld Portable Devices

System Diagnostics

Battery-Powered Test Equipment

Solar-Powered Remote Systems

Receive Signal Strength Indicators

4mA to 20mA Powered Remote Data Acquisition

Systems

Features

♦ Single Supply

+2.7V to +3.6V (MAX1117)

+2.7V to +5.5V (MAX1118)

+4.5V to +5.5V (MAX1119)

♦ Internal Track/Hold: 100kHz Sampling Rate

♦ Internal Reference

+2.048V (MAX1117)

+4.096V (MAX1119)

♦ Reference Input Range: 0 to V

(MAX1118)

♦ SPI/QSPI/MICROWIRE-Compatible Serial Interface

♦ Small 8-Pin SOT23 Package

♦ Automatic Power-Down

♦ Analog Input Range: 0 to V

REF

♦ Low Power

175µA at 100ksps (typ) (MAX1117/MAX1119)

135µA at 100ksps (typ) (MAX1118)

18µA at 10ksps (typ)

1µA (typ) in Power-Down Mode

MAX1117/MAX1118/MAX1119

Single-Supply, Low-Power,

2-Channel, Serial 8-Bit ADCs

________________________________________________________________ Maxim Integrated Products 1

SCLK

DOUT

CNVST

GND

( ) ARE FOR MAX1118 ONLY

CH1

CHO

MAX1117

MAX1118

MAX1119

SOT23

TOP VIEW

(REF) I.C

Pin Configuration

19-1857; Rev 0; 11/00

EVALUATION KIT

AVAILABLE

Ordering Information

PART

TEMP. RANGE

PIN-

PA CK A G E

TO P

M A RK

M A X1 1 1 7 EKA

-40°C to +85°C

8 SOT23

AADW

M A X1 1 1 8 E K A

-40°C to +85°C

8 SOT23 AADX

M A X1 1 1 9 E K A

-40°C to +85°C

8 SOT23 AADY

SPI/QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor, Corp.

Functional Diagram appears at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim's website at www.maxim-ic.com.

Summary of content (14 pages)

PAGE 1
9-1857; Rev 0; 11/00 KIT ATION EVALU LE B A IL A AV Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs The MAX1117/MAX1118/MAX1119 low-power, 8-bit, dual-channel, analog-to-digital converters (ADCs) feature an internal track/hold (T/H) voltage reference (MAX1117/MAX1119), clock, and serial interface. The MAX1118 is specified from +2.7V to +5.5V and consumes only 135µA at 100ksps. The MAX1117 is specified from +2.7V to +3.6V, and the MAX1119 is specified from +4.5V to +5.
PAGE 2
MAX1117/MAX1118/MAX1119 Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs ABSOLUTE MAXIMUM RATINGS VDD to GND ...........................................................-0.3V to +6.0V CH0,CH1, REF to GND...............................-0.3V to (VDD + 0.3V) Digital Output to GND ................................-0.3V to (VDD + 0.3V) Digital Input to GND ..............................................-0.3V to +6.0V Maximum Current into Any Pin .........................................
PAGE 3
Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs (VDD = +2.7V to +3.6V (MAX1117), VDD = +4.5V to +5.5V (MAX1119), VDD = REF = +2.7V to +5.5V (MAX1118),TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS VDD 20 V 10 µA MAX1117 2.7 2.7 5.5 5.5 V MAX1119 4.5 5.5 EXTERNAL REFERENCE (MAX1118 ONLY) Input Voltage Range 1.0 Input Current Ave, VDD = REF = +5.
PAGE 4
ELECTRICAL CHARACTERISTICS (continued) (VDD = +2.7V to +3.6V (MAX1117), VDD = +4.5V to +5.5V (MAX1119), VDD = REF = +2.7V to +5.5V (MAX1118),TA = TMIN to TMAX, unless otherwise noted.
PAGE 5
Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs MAX1117/MAX1119 SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX1117 VDD = +3V 10 3.5 4.5 CONVERSION (ksps) SUPPLY VOLTAGE (V) CONVERSION TIME vs. SUPPLY VOLTAGE CONVERSION TIME vs. TEMPERATURE 5.2 5.5 4.5 MAX1117/18/19 toc09 85 VDD = +3V 5.3 5.2 40k 50k -40 -60 -80 VDD = +5V -100 5.5 -120 -40 -15 10 35 60 0 85 10k 20k 30k TEMPERATURE (°C) ANALOG INPUT FREQUENCY (Hz) MAX1118 GAIN ERROR vs. SUPPLY VOLTAGE MAX1118 GAIN ERROR vs.
PAGE 6
Typical Operating Characteristics (continued) (VDD = +3V (MAX1117), VDD = +5V (MAX1119), VDD = VREF = +3V (MAX1118), fSCLK = 5MHz, fSAMPLE = 100ksps, CLOAD = 100pF, TA = +25°C, unless otherwise noted.) -0.1 -0.2 0.1 0 -0.1 -0.2 0.2 0.1 0 -0.1 -0.2 -0.3 -0.3 -0.3 -0.4 -0.4 -0.4 -0.5 -0.5 3.0 3.5 4.0 4.5 5.0 -15 10 35 60 85 SUPPLY VOLTAGE (V) TEMPERATURE (°C) MAX1117/MAX1119 GAIN ERROR vs. SUPPLY VOLTAGE MAX1117/MAX1119 GAIN ERROR vs. TEMPERATURE 1.
PAGE 7
Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs REFERENCE VOLTAGE vs. NUMBER OF PIECES REFERENCE VOLTAGE vs. NUMBER OF PIECES 17.5% 21.0% 17.5% 14.0% 14.0% 10.5% 10.5% 7.0% 7.0% 3.5% 3.5% 0 3.980 4.020 4.060 4.100 4.140 4.180 MAX1117/18/19 toc26 MAX1115 toc25 21.0% 0 1.982 2.008 2.034 2.060 2.086 2.
PAGE 8
MAX1117/MAX1118/MAX1119 Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs VDD VDD 3kΩ DOUT DOUT 3kΩ GND GND VDD 1μF GND CPU MAX1117 MAX1118 MAX1119 REF* CAPACITIVE DAC VDD VDD ANALOG INPUTS b) VOL TO HIGH-Z Figure 2. Load Circuits for Disable Time Figure 1. Load Circuits for Enable Time 0.1μF GND a) VOH TO HIGH-Z b) HIGH-Z to VOL AND VOH to VOL CH0 CLOAD CLOAD GND GND a) VOL TO VOH DOUT 3kΩ CLOAD CLOAD CH1 3kΩ DOUT CH0 CHOLD 16pF COMPARATOR CH1 CNVST SCLK RIN 6.
PAGE 9
Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs Input Voltage Range Internal protection diodes that clamp the analog input to VDD and GND allow the input pins (CH0, CH1) to swing from (GND - 0.3V) to (VDD + 0.3V) without damage. However, for accurate conversions, the inputs must not exceed (VDD + 50mV) or be less than (GND 50mV). be brought high for at least 50ns, then brought low to initiate a conversion.
PAGE 10
MAX1117/MAX1118/MAX1119 Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs ACTIVE POWER-DOWN MODE tcsh CH0 CNVST CH0 tconv tch tcp tccs IDLE LOW SCLK IDLE LOW tcd tcsd DOUT D7 (MSB) tcl D6 D5 D4 tchz D3 D2 D1 D0 Figure 6a. Conversion and Interface Timing, Conversion on CH0 with SCLK Idle Low ACTIVE POWER-DOWN MODE tcsh CH0 CNVST CH0 tconv tch tcp tccs SCLK IDLE HIGH IDLE HIGH tcsd DOUT tcd D7 (MSB) tcl D6 D5 D4 tchz D3 D2 D1 D0 Figure 6b.
PAGE 11
Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs MAX1117/MAX1118/MAX1119 ACTIVE POWER-DOWN MODE tcsl tcsh CH0 CH1 CH0 CH1 CNVST tch tconv tcp tccs IDLE LOW SCLK IDLE LOW tcd tcsd DOUT D7 (MSB) tcl D6 D5 D4 tchz D3 D2 D1 D0 Figure 6c.
PAGE 12
MAX1117/MAX1118/MAX1119 Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs OUTPUT CODE FULL-SCALE TRANSITION SYSTEM POWER SUPPLIES 11111111 11111110 GND +3V/+5V 11111101 FS = VREF 1LSB = VREF 256 1μF 10Ω* 0.1μF 00000011 GND 00000010 00000001 MAX1117 MAX1118 MAX1119 00000000 0 1 2 3 FS INPUT VOLTAGE (LSB) FS - 1 1/2 LSB Figure 7.
PAGE 13
Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs SCLK CNVST VDD CONTROL LOGIC AND INTERNAL OCSILLATOR GND CH0 INPUT MULTIPLEXER CH1 INPUT TRACK AND HOLD INTERNAL REFERENCE +2.096V OR +4.096V 8-BIT SAR ADC OUTPUT SHIFT REGISTER OUT MAX1117 MAX1119 should be low impedance and as short as possible for noise-free operation. High-frequency noise in the VDD power supply may affect the comparator in the ADC. Bypass the supply to the star ground with a 0.
PAGE 14
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) SOT23, 8L.EPS MAX1117/MAX1118/MAX1119 Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs MARKING 0 0 PACKAGE OUTLINE, SOT-23, 8L BODY 21-0078 G 1 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.