Datasheet

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

General Description

The MAX1178/MAX1188 16-bit, low-power, successive-

approximation analog-to-digital converters (ADCs) fea-

ture automatic power-down, a factory-trimmed internal

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

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

and feature a separate digital supply input for direct

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

The MAX1188 accepts a bipolar analog input voltage

range of ±10V, while the MAX1178 accepts a bipolar

analog input voltage range of ±5V. All devices consume

no more than 26.5mW at a sampling rate of 135ksps

when using an external reference, and 31mW when using

the internal +4.096V reference. AutoShutdown™ reduces

supply current to 0.4mA at 10ksps.

The MAX1178/MAX1188 are ideal for high-perfor-

mance, battery-powered, data-acquisition applications.

Excellent AC performance (THD = -100dB) and DC

accuracy (±2 LSB INL) make the MAX1178/MAX1188

ideal for industrial process control, instrumentation, and

medical applications.

The MAX1178/MAX1188 are available in a 20-pin

TSSOP package and are 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: ±10V, ±5V

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

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

♦ ±2 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

MAX1178/MAX1188

16-Bit, 135ksps, Single-Supply ADCs with

Bipolar Analog 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

0.1µF 0.1µF

MAX1178

MAX1188

Typical Operating Circuit

19-2755; Rev 1; 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

INPUT

VOLTAGE

RANGE (V)

MAX1178ACUP 0°C to +70°C 20 TSSOP ±5

MAX1178BCUP 0°C to +70°C 20 TSSOP ±5

MAX1178CCUP 0°C to +70°C 20 TSSOP ±5

MAX1178AEUP -40° C to +85°C 20 TSSOP ±5

MAX1178BEUP -40° C to +85°C 20 TSSOP ±5

MAX1178CEUP -40°C to +85°C 20 TSSOP ±5

Pin Configuration and Functional Diagram appear at end of

data sheet.

Ordering Information continued at end of data sheet.

Summary of content (14 pages)

PAGE 1
9-2755; Rev 1; 8/03 16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range The MAX1178/MAX1188 are ideal for high-performance, battery-powered, data-acquisition applications. Excellent AC performance (THD = -100dB) and DC accuracy (±2 LSB INL) make the MAX1178/MAX1188 ideal for industrial process control, instrumentation, and medical applications.
PAGE 2
MAX1178/MAX1188 16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog 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 ADCs with Bipolar Analog 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 Input Current SYMBOL IAIN Input Current Step at Power-Up Input Capacitance IPU CONDITIONS MIN TYP MAX MAX1178, -5V ≤ VAIN ≤ +5V Normal operation -1.8 +0.4 Shutdown mode -1.8 +1.8 MAX1188, -10V ≤ VAIN ≤ +10V Normal operation -1.8 +1.
PAGE 4
MAX1178/MAX1188 16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range ELECTRICAL CHARACTERISTICS (continued) (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 UNITS POWER SUPPLIES Analog Supply Voltage AVDD 4.75 5.25 V Digital Supply Voltage DVDD 2.70 5.
PAGE 5
16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range 1.5 1.0 1.0 0 0 -0.5 -1.0 -1.0 -1.5 -1.5 -2.0 -2.0 -2.5 SUPPLY CURRENT (AVDD + DVDD) vs. SAMPLE RATE SHUTDOWN CURRENT (AVDD + DVDD) vs. TEMPERATURE SHUTDOWN MODE 0.01 0.001 VAIN = 0V 0.0001 0.1 1 10 100 4.0 3.0 2.5 2.0 1.5 -0.10 20 40 TEMPERATURE (°C) 60 80 MAX1188 MAX1178 -4 -8 -40 -20 0 20 40 60 -40 80 -20 0 20 40 60 80 TEMPERATURE (°C) FFT AT 1kHz 4.136 4.126 4.116 4.106 4.096 4.086 4.
PAGE 6
Typical Operating Characteristics (continued) (Typical Operating Circuit, AVDD = DVDD = +5V, external reference = +4.096V, CREF = 10µF, CREFADJ = 0.1µF, VREFADJ = AVDD, CLOAD = 20pF. Typical values are at TA = +25°C, unless otherwise noted.) SFDR vs. FREQUENCY 90 80 THD vs. FREQUENCY 0 MAX1178/88 toc11 MAX1178/88 toc10 120 100 MAX1178/88 toc12 SINAD vs.
PAGE 7
16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range PIN NAME FUNCTION 13 HBEN 14 CS 15 DGND Digital Ground 16 DVDD Digital Supply Voltage. Bypass with a 0.1µF capacitor to DGND. 17 D0/D8 Tri-State Digital-Data Output. D0 is the LSB. 18 D1/D9 Tri-State Digital-Data Output 19 D2/D10 Tri-State Digital-Data Output 20 D3/D11 Tri-State Digital-Data Output High-Byte Enable Input. Used to multiplex the 16-bit conversion result. 1: MSB available on the data bus.
PAGE 8
MAX1178/MAX1188 16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range tCSH tCSL CS tACQ REF POWERDOWN CONTROL R/C tDH tDS tEOC tDV EOC tCONV tDO HBEN tBR tDO1 tDO HIGH-Z HIGH-Z D7/D15–D0/D8 HIGH/LOW BYTE VALID HIGH/LOW BYTE VALID Figure 2. MAX1178/MAX1188 Timing Diagram 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).
PAGE 9
16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range 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 MAX1178/MAX1188 to exit standby mode and begin acquisition. The reference and reference buffer remain active to allow quick turn-on time. Shutdown Mode In shutdown mode, the reference and reference buffer are shut down between conversions. Shutdown mode reduces supply current to 0.
PAGE 10
MAX1178/MAX1188 16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range OUTPUT CODE MAX1178 MAX1188 +5V 11 1111 1111 1111 MAX1178 INPUT RANGE = -5V TO +5V FULL-SCALE TRANSITION 11 1111 1111 1110 68kΩ 11 1111 1111 1101 100kΩ REFADJ 150kΩ 0.1µF 10 0000 0000 0001 10 0000 0000 0000 01 1111 1111 1111 FULL-SCALE RANGE (FSR) = +1V 00 0000 0000 0011 00 0000 0000 0010 Figure 7.
PAGE 11
16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range REF ANALOG INPUT MAX427 1.5 ANALOG INPUT CURRENT (mA) AIN MAX1178/MAX1188 MAX1178 MAX1188 MAX1178 ANALOG INPUT CURRENT vs. ANALOG INPUT VOLTAGE 1.0 0.5 SHUTDOWN MODE 0 -0.5 STANDBY MODE -1.0 -1.5 -5.0 -2.5 0 2.5 5.0 ANALOG INPUT VOLTAGE (V) Figure 10. MAX1178/MAX1188 Fast-Settling Input Buffer Figure 11. MAX1178 Analog Input Current change in input signal.
PAGE 12
MAX1178/MAX1188 16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range Definitions 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 MAX1178/MAX1188 are measured using the end-point method.
PAGE 13
16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range REFADJ HBEN AVDD AGND DVDD DGND 5kΩ REFERENCE OUTPUT REGISTERS 8 BITS 8 BITS D0–D7 OR D8–D15 REF AIN INPUT SCALER CAPACITIVE DAC MAX1178 MAX1188 AGND SUCCESSIVEAPPROXIMATION REGISTER AND CONTROL LOGIC CLOCK CS EOC R/C Pin Configuration TOP VIEW Ordering Information (continued) PART TEMP RANGE INPUT PINVOLTAGE PACKAGE RANGE (V) D4/D12 1 20 D3/D11 D5/D13 2 19 D2/D10 MAX1188ACUP 0°C to +70°C 20 TSSOP ±10 D6/D14 3
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.) TSSOP4.40mm.EPS MAX1178/MAX1188 16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.