Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - AD converter (ADC) External , Internal TSSOP 20

General Description

The MAX1177 is a 16-bit, low-power, successive-

approximation analog-to-digital converter (ADC) featur-

ing automatic power-down, a factory-trimmed internal

clock, and a byte-wide parallel interface. The device

operates from a single +4.75V to +5.25V analog supply

and features a separate digital supply input for direct

interface with +2.7V to +5.25V digital logic.

The MAX1177 accepts an analog input voltage range

from 0 to +10V. It consumes no more than 26.5mW at a

sampling rate of 135ksps when using an external refer-

ence, and 31mW when using the internal +4.096V refer-

ence. AutoShutdown™ reduces supply current to

0.4mA at 10ksps.

The MAX1177 is ideal for high-performance, battery-

powered, data-acquisition applications. Excellent AC

performance (THD = -100dB) and DC accuracy (±3

LSB INL) make this device ideal for industrial process

control, instrumentation, and medical applications.

The MAX1177 is available in a 20-pin TSSOP package

and is fully specified over the -40°C to +85°C extended

temperature range and the 0°C to +70°C commercial

temperature range.

Applications

Temperature Sensing and Monitoring

Industrial Process Control

I/O Modules

Data-Acquisition Systems

Precision Instrumentation

Features

♦ Byte-Wide Parallel Interface

♦ Analog Input Voltage Range: 0 to +10V

♦ Single +4.75V to +5.25V Analog Supply Voltage

♦ Interfaces with +2.7V to +5.25V Digital Logic

♦ ±3 LSB INL

♦ ±1 LSB DNL

♦ Low Supply Current (max)

2.9mA (External Reference)

3.8mA (Internal Reference)

5µA AutoShutdown Mode

♦ Small Footprint

♦ 20-Pin TSSOP Package

MAX1177

16-Bit, 135ksps, Single-Supply ADC

with 0 to 10V Input Range

________________________________________________________________ Maxim Integrated Products 1

D0–D7

D8–D15

µP DATA

BUS

AGND DGND

+5V ANALOG +5V DIGITAL

ANALOG INPUT AIN

HBEN

EOC

R/C

REF

REFADJ

HIGH

BYTE

LOW

BYTE

10µF0.1µF

0.1µF0.1µF

MAX1177

Typical Operating Circuit

19-2597; Rev 0; 8/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

AutoShutdown is a trademark of Maxim Integrated Products, Inc.

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX1177ACUP 0°C to +70°C 20 TSSOP

MAX1177BCUP 0°C to +70°C 20 TSSOP

MAX1177CCUP 0°C to +70°C 20 TSSOP

MAX1177AEUP -40°C to +85°C 20 TSSOP

MAX1177BEUP -40°C to +85°C 20 TSSOP

MAX1177CEUP -40°C to +85°C 20 TSSOP

Pin Configuration and Functional Diagram appear at end of

data sheet.

Summary of content (13 pages)

PAGE 1
9-2597; Rev 0; 8/03 16-Bit, 135ksps, Single-Supply ADC with 0 to 10V Input Range The MAX1177 is available in a 20-pin TSSOP package and is fully specified over the -40°C to +85°C extended temperature range and the 0°C to +70°C commercial temperature range. Features ♦ Byte-Wide Parallel Interface ♦ Analog Input Voltage Range: 0 to +10V ♦ Single +4.75V to +5.25V Analog Supply Voltage ♦ Interfaces with +2.7V to +5.25V Digital Logic ♦ ±3 LSB INL ♦ ±1 LSB DNL ♦ Low Supply Current (max) 2.
PAGE 2
MAX1177 16-Bit, 135ksps, Single-Supply ADC with to 10V Input Range ABSOLUTE MAXIMUM RATINGS AVDD to AGND .........................................................-0.3V to +6V DVDD to DGND.........................................................-0.3V to +6V AGND to DGND.....................................................-0.3V to +0.3V AIN to AGND .....................................................-16.5V to +16.5V REF, REFADJ to AGND............................-0.3V to (AVDD + 0.
PAGE 3
16-Bit, 135ksps, Single-Supply ADC with 0 to 10V Input Range (AVDD = DVDD = +5V ±5%, external reference = +4.096V, CREF = 10µF, CREFADJ = 0.1µF, VREFADJ = AVDD, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX 4.056 4.096 4.
PAGE 4
TIMING CHARACTERISTICS (Figures 1 and 2) (AVDD = +4.75V to +5.25V, DVDD = +2.7V to AVDD, external reference = +4.096V, CREF = 10µF, CREFADJ = 0.1µF, VREFADJ = AVDD, CLOAD = 20pF, TA = TMIN to TMAX.
PAGE 5
16-Bit, 135ksps, Single-Supply ADC with 0 to 10V Input Range SHUTDOWN CURRENT (AVDD + DVDD) vs. TEMPERATURE 0.001 3.5 3.0 2.5 2.0 1.5 1 10 100 -40 20 40 60 -0.05 0 20 40 60 4.086 -60 -80 -100 -120 -160 -180 -40 -20 0 20 40 60 80 0 TEMPERATURE (°C) SINAD vs. FREQUENCY 80 100 20 30 40 50 60 THD vs. FREQUENCY 0 MAX1177 toc11 MAX1177 toc10 120 10 FREQUENCY (kHz) SFDR vs. FREQUENCY 90 80 -140 TEMPERATURE (°C) 100 60 fSAMPLE = 131ksps -20 4.076 80 40 -40 4.
PAGE 6
16-Bit, 135ksps, Single-Supply ADC with to 10V Input Range MAX1177 Pin Description PIN NAME 1 D4/D12 Tri-State Digital-Data Output 2 D5/D13 Tri-State Digital-Data Output 3 D6/D14 Tri-State Digital-Data Output 4 D7/D15 Tri-State Digital-Data Output. D15 is the MSB. R/C Read/Convert Input. Power up and put the device in acquisition mode by holding R/C low during the first falling edge of CS.
PAGE 7
16-Bit, 135ksps, Single-Supply ADC with 0 to 10V Input Range Converter Operation The MAX1177 uses a successive-approximation (SAR) conversion technique with an inherent track-and-hold (T/H) stage to convert an analog input into a 16-bit digital output. Parallel outputs provide a high-speed interface to microprocessors (µPs). The Functional Diagram shows a simplified internal architecture of the MAX1177. Figure 3 shows a typical operating circuit for the MAX1177.
PAGE 8
MAX1177 16-Bit, 135ksps, Single-Supply ADC with to 10V Input Range Power-Down Modes Select standby mode or shutdown mode with the R/C bit during the second falling edge of CS (see the Selecting Standby or Shutdown Mode section). The MAX1177 automatically enters either standby mode (reference and buffer on) or shutdown (reference and buffer off) after each conversion, depending on the status of R/C during the second falling edge of CS. +5V ANALOG 0.1µF 0.
PAGE 9
16-Bit, 135ksps, Single-Supply ADC with 0 to 10V Input Range CONVERSION DATA OUT ACQUISITION CS CS R/C R/C EOC EOC REF AND BUFFER POWER REF AND BUFFER POWER MAX1177 ACQUISITION DATA OUT CONVERSION Figure 6. Selecting Shutdown Mode Figure 5. Selecting Standby Mode Standby Mode While in standby mode, the supply current is less than 3.7mA (typ). The next falling edge of CS with R/C low causes the MAX1177 to exit standby mode and begin acquisition.
PAGE 10
MAX1177 16-Bit, 135ksps, Single-Supply ADC with to 10V Input Range INPUT RANGE = 0V TO +10V OUTPUT CODE FULL-SCALE TRANSITION 1111 1111 1111 1111 1111 1111 1111 1110 1111 1111 1111 1101 MAX1177 AIN ANALOG INPUT FULL-SCALE RANGE (FSR) = +10V 0000 0000 0000 0011 1 LSB = 0000 0000 0000 0010 MAX427 FSR x VREF 65536 x 4.096 0000 0000 0000 0001 0000 0000 0000 0000 0 1 2 3 65,535 65,534 65,536 INPUT VOLTAGE (LSB) Figure 8. MAX1177 Transfer Function Figure 9.
PAGE 11
16-Bit, 135ksps, Single-Supply ADC with 0 to 10V Input Range Integral Nonlinearity Integral nonlinearity (INL) is the deviation of the values on an actual transfer function from a straight line. This straight line can be either a best-straight-line fit or a line drawn between the end points of the transfer function, once offset and gain errors have been nullified. The static linearity parameters for the MAX1177 are measured using the end-point method.
PAGE 12
16-Bit, 135ksps, Single-Supply ADC with to 10V Input Range MAX1177 Functional Diagram REFADJ HBEN AVDD AGND DVDD DGND 5kΩ REFERENCE OUTPUT REGISTERS 8 BITS D0–D7 OR D8–D15 REF AIN INPUT SCALER 8 BITS CAPACITIVE DAC AGND MAX1177 SUCCESSIVEAPPROXIMATION REGISTER AND CONTROL LOGIC CLOCK CS EOC R/C Pin Configuration Chip Information TRANSISTOR COUNT: 15,383 PROCESS: BiCMOS TOP VIEW D4/D12 1 20 D3/D11 D5/D13 2 19 D2/D10 D6/D14 3 18 D1/D9 D7/D15 4 17 D0/D8 R/C 5 MAX1177 EOC 6 16 DVD
PAGE 13
16-Bit, 135ksps, Single-Supply ADC with 0 to 10V Input Range TSSOP4.40mm.EPS Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.