Datasheet

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MAX1157/MAX1159/MAX1175

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

Bipolar Analog Input Range

________________________________________________________________ Maxim Integrated Products 1

19-2653; Rev 1; 1/03

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.

General Description

The MAX1157/MAX1159/MAX1175 14-bit, low-power,

successive-approximation analog-to-digital converters

(ADCs) feature automatic power-down, a factory-trimmed

internal clock, and a 14-bit 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 +2.7V to +5.25V digital logic.

The MAX1157 accepts an analog input voltage range

from 0 to +10V while the MAX1159 accepts a bipolar

analog input voltage range of ±10V. The MAX1175

accepts a bipolar analog input voltage range of ±5V.

All devices consume only 23mW at a sampling rate

of 135ksps when using an external reference and

29mW when using the internal +4.096V reference.

AutoShutdown™ reduces supply current to 0.4mA at

10ksps. The MAX1157/MAX1159/MAX1175 are ideal for

high-performance, battery-powered data-acquisition

applications. Excellent AC performance (THD = -100dB)

and DC accuracy (±1LSB INL) make the MAX1157/

MAX1159/MAX1175 ideal for industrial process control,

instrumentation, and medical applications.

The MAX1157/MAX1159/MAX1175 are available in a

28-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

♦ Analog Input Voltage Range ±10V, ±5V, or 0 to 10V

♦ 14-Bit Wide Parallel Interface

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

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

♦ ±1LSB INL (max)

♦ ±1LSB DNL (max)

♦ Low Supply Current (MAX1159)

5.3mA (External Reference)

6.2mA (Internal Reference)

5µA AutoShutdown Mode

♦ Small Footprint

28-Pin TSSOP Package

Ordering Information

PART TEMP RANGE PIN-PACKAGE

INPUT VOLTAGE

RANGE

INL (LSB)

MAX1157ACUI 0°C to +70°C 28 TSSOP 0 to +10V ±1

MAX1157BCUI 0°C to +70°C 28 TSSOP 0 to +10V ±2

REFADJ

N.C.

DGND

RESET

REF

AGND

AIN

AGND

EOC

R/C

D13

D12

D11

D10

TSSOP

TOP VIEW

MAX1157

MAX1159

MAX1175

Pin Configuration

AutoShutdown is a trademark of Maxim Integrated Products, Inc.

Ordering Information continued at end of data sheet.

Summary of content (15 pages)

PAGE 1
9-2653; Rev 1; 1/03 14-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range Features ♦ Analog Input Voltage Range ±10V, ±5V, or 0 to 10V ♦ 14-Bit Wide Parallel Interface ♦ Single +4.75V to +5.25V Analog Supply Voltage ♦ Interfaces with +2.7V to +5.25V Digital Logic ♦ ±1LSB INL (max) ♦ ±1LSB DNL (max) ♦ Low Supply Current (MAX1159) 5.3mA (External Reference) 6.
PAGE 2
MAX1157/MAX1159/MAX1175 14-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
14-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 CONDITIONS Input Capacitance IPU TYP MAX MAX1157, 0 ≤ VAIN ≤ +10V Normal/shutdown mode -0.1 +2.0 MAX1159, -10V ≤ VAIN ≤ +10V Normal operation -1.8 +1.2 Shutdown mode -1.8 +1.8 Normal operation -1.8 +0.
PAGE 4
MAX1157/MAX1159/MAX1175 14-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 4.75 5.25 V 2.70 5.
PAGE 5
14-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range 0.8 0.6 0 -0.5 -0.2 -1.0 -0.4 -1.5 -0.6 -2.0 -0.8 -2.5 4096 8192 12288 0.001 VAIN = 0V 0.0001 0.1 1 10 100 4.0 3.5 3.0 2.5 2.0 1.5 -20 0 20 40 60 -0.10 -4 80 -40 MAX1157 toc08 4.126 MAGNITUDE (dB) 4.106 4.096 4.086 4.076 -100 -120 -140 -160 40 60 80 fSAMPLE = 135ksps -80 -180 20 80 60 -60 4.056 0 40 -40 4.116 -0.20 TEMPERATURE (°C) 20 -20 4.066 -20 0 FFT AT 1kHz 0 -0.
PAGE 6
Typical Operating Characteristics (AVDD = DVDD = +5V, external reference = +4.096V, CREF = 10µF, CREFADJ = 0.1µF, VREFADJ = AVDD, CLOAD = 20pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Typical Application Circuit) SPURIOUS-FREE DYNAMIC RANGE vs. FREQUENCY 90 80 100 70 0 MAX1157 toc11 120 MAX1157 toc10 100 TOTAL HARMONIC DISTORTION vs. FREQUENCY -10 -20 -30 80 50 40 -40 THD (dB) SFDR (dB) 60 60 -50 -60 -70 40 30 MAX1157 toc12 SINAD vs.
PAGE 7
14-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range PIN NAME FUNCTION 15 REFADJ 16 REF 17 RESET 18 CS 19 DGND Digital Ground 20 DVDD Digital Supply Voltage. Bypass with a 0.1µF capacitor to DGND. 21, 22 N.C. No Connection. Make no connection to these pins.
PAGE 8
MAX1157/MAX1159/MAX1175 14-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range tCSL tCSH CS tACQ REF POWERDOWN CONTROL tDS R/C tDH tEOC tDV EOC tCONV HIGH-Z D0–D13 tBR tDO HIGH-Z DATA VALID Figure 2. MAX1157/MAX1159/MAX1175 Timing Diagram +5V ANALOG 0.1µF Select standby mode or shutdown mode with R/C during the second falling edge of CS (see Selecting Standby or Shutdown Mode section).
PAGE 9
14-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range MAX1157/MAX1159/MAX1175 REF MAX1157 R2 161Ω MAX1159/MAX1175 3.4kΩ 3.4kΩ AIN TRACK S1 CHOLD 30pF 161Ω AIN HOLD R3 S2 S1, S2 = T/H SWITCH S3 = POWER-DOWN (MAX1159/MAX1175 ONLY) TRACK S1 T/H OUT HOLD TRACK R3 R2 S3 POWERDOWN CHOLD 30pF HOLD TRACK T/H OUT HOLD S2 R2 = 7.85kΩ (MAX1159) OR 3.92kΩ (MAX1157/MAX1175) R3 = 5.45kΩ (MAX1159) OR 17.79kΩ (MAX1157/MAX1175) Figure 4.
PAGE 10
MAX1157/MAX1159/MAX1175 14-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range ACQUISITION CONVERSION DATA OUT CS R/C EOC REF AND BUFFER POWER Figure 6. Selecting Shutdown Mode MAX1157 MAX1159 MAX1175 +5V 100kΩ 68kΩ REFADJ 0.1µF 150kΩ Figure 7. MAX1157/MAX1159/MAX1175 Reference Adjust Circuit Shutdown Mode In shutdown mode, the reference and reference buffer shut down between conversions. Shutdown mode reduces supply current to 0.5µA (typ) immediately after the conversion.
PAGE 11
14-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range OUTPUT CODE FULL-SCALE TRANSITION 11 . . . 111 11 . . . 110 11 . . . 101 11 . . . 1111 11 . . . 1110 11 . . . 1101 FULL-SCALE RANGE (FSR) = +10V 1LSB = 00 . . . 011 FSR x VREF 16384 x 4.096 00 . . . 010 00 . . . 001 00 . . . 000 0 1 2 16382 16384 16383 3 Figure 8. MAX1157 Transfer Function INPUT RANGE = -5V TO +5V 10 . . . 0001 10 . . . 0000 01 . . . 1111 FULL-SCALE RANGE (FSR) = +10V 1LSB = 00 . . . 0011 00 . . . 0010 00 .
PAGE 12
Definitions Integral Nonlinearity REF MAX1157 MAX1159 MAX1175 ** MAX427 AIN ANALOG INPUT * 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 MAX1157/MAX1159/ MAX1175 are measured using the endpoint method.
PAGE 13
14-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range Total Harmonic Distortion Total harmonic distortion (THD) is the ratio of the RMS sum of the first five harmonics of the input signal to the fundamental itself.
PAGE 14
-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range MAX1157/MAX1159/MAX1175 Functional Diagram REFADJ AVDD AGND DVDD DGND 5kΩ REFERENCE OUTPUT REGISTERS 14 BITS 14 BITS D0–D13 REF AIN INPUT SCALER MAX1157 MAX1159 MAX1175 CAPACITIVE DAC AGND RESET CLOCK CS SUCCESSIVEAPPROXIMATION REGISTER AND CONTROL LOGIC EOC R/C 14 ______________________________________________________________________________________
PAGE 15
14-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog 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.