Rainbow Electronics MAX1338 User Manual

General Description

The MAX1338 14-bit, analog-to-digital converter (ADC) offers four simultaneously sampled, fully differential input channels, with independent track-and-hold (T/H) circuitry for each channel. The input channels are individually software programmable for input ranges of ±10V, ±5V, ±2.5V, and ±1.25V. The input channels feature fault tolerance to ±17V. The internal T/H circuits have a 16ns aperture delay and 100ps aperture-delay matching.

A 14-bit parallel bus provides the conversion result with a maximum per-channel output rate of 150ksps (600ksps for all four channels). The MAX1338 has an on-board oscillator and 2.5V internal reference. An external clock and/or reference can also be used.

The MAX1338 operates from a +5V supply for analog inputs and digital core. The device operates from a +2.7V to +5.25V supply for the digital I/O lines. The MAX1338 features two power-saving modes: standby mode and shutdown mode. Standby mode allows rapid wake-up and reduces quiescent current to 4mA (typ), and shutdown mode reduces sleep current to less than 10µA (typ).

The MAX1338 is available in an 8mm x 8mm x 0.8mm, 56-pin, thin QFN package. The device operates over the extended -40°C to +85°C temperature range.

Applications

Multiple-Channel Data Recorders Vibration Analysis Motor Control: 3-Phase Voltage, Current, and

Power Measurement Optical Communication Equipment

Features

♦ 150ksps Sample Rate per Channel

♦ All Four Input Channels Simultaneously Sampled

16ns Aperture Delay 100ps Aperture-Delay Matching

♦ Channel-Independent Software-Selectable Input

Range: ±10V, ±5V, ±2.5V, ±1.25V

♦ ±17V Fault-Tolerant Inputs

♦ Dynamic Performance at 10kHz Input

SNR: 77dB SINAD: 76dB SFDR: 98dBc THD: -83dBc

♦ DC Performance

INL: ±2 LSB DNL: ±1 LSB Offset Error: ±4 LSB Gain Error: ±0.1% FSR

♦ 14-Bit Parallel Interface

♦ Internal Clock and Reference Voltage

♦ +5V Analog and Digital Supplies

♦ +2.7V to +5.25V Digital I/O Supply

♦ 56-Pin Thin QFN Package (8mm x 8mm x 0.8mm)

MAX1338

14-Bit, 4-Channel, Software-Programmable,

Multiranging, Simultaneous-Sampling ADC

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3151; Rev 0; 4/04

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.

PART TEMP RANGE PIN-PACKAGE

MAX1338ETN -40°C to +85°C 56 Thin QFN-EP*

*EP = Exposed pad.

Pin Configuration appears at end of data sheet.

MAX1338

14-Bit, 4-Channel, Software-Programmable, Multiranging, Simultaneous-Sampling ADC

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

AVDDto AGND .........................................................-0.3V to +6V

to DGND.........................................................-0.3V to +6V

DRV

to DRGND....................................................-0.3V to +6V

to DVDD.......................................................-0.3V to +0.3V

DGND to DRGND..................................................-0.3V to +0.3V

AGND to DGND.....................................................-0.3V to +0.3V

AGND to DRGND ..................................................-0.3V to +0.3V

AIN0+, AIN0-, AIN1+, AIN1-, AIN2+, AIN2-, AIN3+,

AIN3- to AGND.....................................................-17V to +17V

D0–D13 to DRGND................................-0.3V to (DRV

+ 0.3V)

REFADC, REFP1, REFP2, REFN1, REFN2, COM1, COM2 to

AGND....................................................-0.3V to (AV

+ 0.3V)

INTCLK/

EXTCLK to AGND.......................-0.3V to (AVDD+ 0.3V)

CS, RD, WR, CONVST, to DRGND........-0.3V to (DRV

+ 0.3V)

SHDN, STANDBY, CLK, EOC,

EOLC to DRGND................................-0.3V to (DRV

+ 0.3V)

Maximum Current into Any Pin .........................................±50mA

Continuous Power Dissipation (T

= +70°C)

56-Pin Thin QFN (derate 31.3mW /°C above +70°C)....2500mW

Operating Temperature Range ...........................-40°C to +85°C

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

Maximum Junction Temperature .....................................+150°C

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

Junction to Ambient Thermal Resistance θ

..................32°C/W

Junction to Case Thermal Resistance θ

.........................2°C/W

ELECTRICAL CHARACTERISTICS

(AVDD= DVDD= +5.0V, DRVDD= +3.0V, AGND = DGND = DRGND = 0, INTCLK/EXTCLK = AGND, f

CLK

= 5MHz, input range =

±10V, REFP2 = REFP1, REFN2 = REFN1, COM1 = COM2, 1.0nF from REFADC to AGND, 1.0µF and 0.1µF from COM1 to AGND,

0.1µF from REFP1 to AGND, 0.1µF from REFN1 to AGND, 1.0µF from REFP1 to REFN1. Typical values are at T

= +25°C. TA= T

MIN

to T

MAX

, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

STATIC PERFORMANCE

Resolution N 14 Bits Integral Nonlinearity INL (Note 1) ±1 ±3 LSB Differential Nonlinearity DNL No missing codes (Note 1)

±1 LSB

Offset Error (Note 1) ±4 ±16 LSB Offset-Error Temperature

Coefficient

ppm/°C

Offset-Error Matching

LSB

Gain Error Offset nulled (Notes 1, 2)

%FSR

Channel Gain-Error Matching Offset nulled

LSB

Gain-Error Temperature Coefficient

Offset nulled 10

ppm/°C

DYNAMIC PERFORMANCE (at fIN = 10kHz, AIN = -0.2dBFS) Sampling Rate Per Channel Simultaneous on all channels 150

ksps

Signal-to-Noise Ratio SNR (Note 1) 75 77 dB Signal-to-Noise Plus Distortion SINAD (Note 1) 74 76 dB Total Harmonic Distortion THD (Note 1) -83 -80 dBc Spurious-Free Dynamic Range SFDR Range 0 (Note 1) 85 dBc Channel-to-Channel Isolation (Note 1) 80 dB ANALOG INPUTS (AIN_)

Range set bits = (0,0) -10 Range set bits = (0,1) -5 +5 Range set bits = (1,0)

Input Differential Voltage Range

Range set bits = (1,1)

±0.25

±10

±0.1 ±0.35

±20

-2.5 +2.5

-1.25 +1.25

+10

MAX1338

14-Bit, 4-Channel, Software-Programmable,

Multiranging, Simultaneous-Sampling ADC

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(AVDD= DVDD= +5.0V, DRVDD= +3.0V, AGND = DGND = DRGND = 0, INTCLK/EXTCLK = AGND, f

CLK

= 5MHz, input range =

±10V, REFP2 = REFP1, REFN2 = REFN1, COM1 = COM2, 1.0nF from REFADC to AGND, 1.0µF and 0.1µF from COM1 to AGND,

0.1µF from REFP1 to AGND, 0.1µF from REFN1 to AGND, 1.0µF from REFP1 to REFN1. Typical values are at T

= +25°C. TA= T

MIN

to T

MAX

, unless otherwise noted.)

PARAMETER

CONDITIONS

UNITS

Range set bits = (0,0) -5 +5 Range set bits = (0,1) Range set bits = (1,0)

Input Common-Mode Range

Range set bits = (1,1)

Input Resistance All settings

kΩ

Input Capacitance 15 pF Small-Signal Bandwidth SSBW (Note 1) 1

MHz

Full-Power Bandwidth FPBW (Note 1) 75 kHz INTERNAL REFERENCE (REFADC) Output Voltage

2.5

Differential Reference Voltage

REFP–

REFN

2.5 V

Output-Voltage Temperature Coefficient

ppm/°C

Load Regulation 5

V/mA

EXTERNAL REFERENCE

REFADC Voltage Input Range 2.0 2.5 3.0 V REFADC Input Current (Note 3)

µA

REFADC Input Resistance R

REF

5kΩ

REFADC Input Capacitance 15 pF

TRACK/HOLD (T/H)

Aperture Delay t

(Note 1) 16 ns

Aperture-Delay Matching

Aperture Jitter t

(Note 1) 50

RMS

CLOCK-SELECT INPUT (INTCLK/EXTCLK)

Input-Voltage High V

0.7 x V

Input-Voltage Low V

0.3 x V

DIGITAL INTERFACE AND CONTROL INPUTS (CS, RD, WR, CONVST, SHDN, CLK, STANDBY)

Input-Voltage High V

0.7 x V

Input-Voltage Low V

0.3 x V

Input Hysteresis 50 mV Input Capacitance C

15 pF

SYMBOL

MIN TYP MAX

-2.5 +2.5

-1.25 +1.25

-0.625 +0.625

2.475

-250 +250

DRV

6.25

100

2.525

DRV

MAX1338

14-Bit, 4-Channel, Software-Programmable, Multiranging, Simultaneous-Sampling ADC

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(AVDD= DVDD= +5.0V, DRVDD= +3.0V, AGND = DGND = DRGND = 0, INTCLK/EXTCLK = AGND, f

CLK

= 5MHz, input range =

±10V, REFP2 = REFP1, REFN2 = REFN1, COM1 = COM2, 1.0nF from REFADC to AGND, 1.0µF and 0.1µF from COM1 to AGND,

0.1µF from REFP1 to AGND, 0.1µF from REFN1 to AGND, 1.0µF from REFP1 to REFN1. Typical values are at T

= +25°C. TA= T

MIN

to T

MAX

, unless otherwise noted.)

PARAMETER

CONDITIONS

UNITS

Input Current I

VIN = 0 or DRV

±1 µA

DIGITAL INTERFACE AND CONTROL OUTPUTS (EOC, EOLC)

Output-Voltage High V

Sourcing 0.8mA

DRV

Output-Voltage Low V

Sinking 1.6mA 0.4 V

PARALLEL DIGITAL I/O (D0–D7)

Output-Voltage High V

Sourcing 0.8mA

DRV

0.6

Output-Voltage Low V

Sinking 1.6mA 0.4 V Leakage Current 1µA Tristate Output Capacitance RD = 1 or CS = 1 15 pF

Input-Voltage High V

0.7 x V

Input-Voltage Low V

0.3 x V

Input Hysteresis 50 mV Input Capacitance C

15 pF

Input Current I

VIN = 0 or DRV

±1 µA

PARALLEL DIGITAL OUTPUTS (D8–D13)

Output-Voltage High V

Sourcing 0.8mA

DRV

0.6

Output-Voltage Low V

Sinking 1.6mA 0.4 V Leakage Current 1µA Tristate Output Capacitance 15 pF

POWER SUPPLIES

Analog Supply Voltage AV

Digital Supply Voltage DV

Parallel Digital I/O Supply Voltage

DRV

41 60

SHDN = 1

0.1Analog Supply Current AI

STANDBY = 1, SHDN = 0 4.2 5

SHDN = 1

Digital Supply Current DI

STANDBY = 1, SHDN = 0

SHDN = 1 0

Digital Driver Supply Current DRI

STANDBY = 1, SHDN = 0 0

Analog Power-Supply Rejection

4.75V to 5.25V (Note 1) 75 dB

SYMBOL

MIN TYP MAX

- 0.6

DRV

4.75

2.70 5.25

0.005

0.001 0.05

DRV

5.25

0.05

MAX1338

14-Bit, 4-Channel, Software-Programmable,

Multiranging, Simultaneous-Sampling ADC

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

(AVDD= DVDD= +5.0V, DRVDD= +3.0V, AGND = DGND = DRGND = 0, INTCLK/EXTCLK = AGND, f

CLK

= 5MHz, input range =

±10V, REFP2 = REFP1, REFN2 = REFN1, COM1 = COM2, 1.0nF from REFADC to AGND, 1.0µF and 0.1µF from COM1 to AGND,

0.1µF from REFP1 to AGND, 0.1µF from REFN1 to AGND, 1.0µF from REFP1 to REFN1. Typical values are at T

= +25°C. TA= T

MIN

to T

MAX

, unless otherwise noted.)

PARAMETER

CONDITIONS

UNITS

TIMING CHARACTERISTICS (Figures 4, 5, and 6)

Internal clock 2.9 3.2 3.5 µs Time to First Conversion Result t

EOC1

External clock 16

CLK

Cycles

Internal clock 600 ns

Time to Subsequent Conversions

External clock 3

CLK

Cycles

CONVST Pulse-Width Low

0.1 µs

CS Pulse Width t

30 ns

RD Pulse-Width Low t

RDL

30 ns

RD Pulse-Width High t

RDH

30 ns

WR Pulse-Width Low t

WRL

30 ns

CS to WR Setup Time t

CTW

0ns

WR to CS Hold Time t

WTC

0ns

CS to RD Setup Time t

CTR

0ns

RD to CS Hold Time t

RTC

0ns

Data Access Time (RD Low to Valid Data)

ACC

Figure 1 30 ns

Bus Relinquish Time (RD High to D_ High-Z)

REQ

Figure 1 5 30 ns

CLK Rise to End-of-Conversion (EOC) Rise/Fall Delay

EOCD

20 ns

CLK Rise to End-of-LastConversion (EOLC) Fall Delay

EOLCD

20 ns

CONVST Rise to EOLC Fall Delay

20 ns

Internal clock

200 ns

EOC Pulse-Width Low t

EOC

External clock 1

CLK

Cycle

Wake-Up Time From Standby 7µs Wake-Up Time From Shutdown All bypass capacitors discharged 5 ns

SYMBOL

CONVST

MIN TYP MAX

CVEOLCD

180

MAX1338

14-Bit, 4-Channel, Software-Programmable, Multiranging, Simultaneous-Sampling ADC

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(AVDD= DVDD= +5.0V, DRVDD= +3.0V, AGND = DGND = DRGND = 0, INTCLK/EXTCLK = AGND, f

CLK

= 5MHz, input range =

±10V, REFP2 = REFP1, REFN2 = REFN1, COM1 = COM2, 1.0nF from REFADC to AGND, 1.0µF and 0.1µF from COM1 to AGND,

0.1µF from REFP1 to AGND, 0.1µF from REFN1 to AGND, 1.0µF from REFP1 to REFN1. Typical values are at T

= +25°C. TA= T

MIN

to T

MAX

, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

EOC Fall to RD Fall Setup Time

0ns 0ns

Input Data Setup Time t

DTW

10 ns

Input Data Hold Time t

WTD

10 ns

External CLK Period t

CLK

200 ns

External CLK High Period t

CLKH

Logic sensitive to rising edges 60 ns

External CLK Low Period t

CLKL

Logic sensitive to rising edges 60 ns

External Clock Frequency f

CLK

(Note 4) 1 6

MHz

Internal Clock Frequency f

INT

5.0

5.5

MHz

CONVST High to CLK Edge t

CNTC

30 ns

Quiet Time t

QUIET

Note 1: See definition for this parameter in the Definitions section. Note 2: Differential reference voltage (REFP–REFN) error nulled. Note 3: This is the load the MAX1338 presents to an external reference at REFADC. Note 4: Minimum CLK frequency is limited only by the internal T/H droop rate. Limit the time between the rising edge of CONVST to

the falling edge of EOLC to a maximum of 0.25ms.

1.6V

1.6mA

0.8mA

50pF

TO OUTPUT PIN

Figure 1. Load Circuit for Data Access Time and BusRelinquish Time

EOCRD

EOLC Fall to RD Fall Setup Time t

EOLCRD

166

5.25

600

MAX1338

14-Bit, 4-Channel, Software-Programmable,

Multiranging, Simultaneous-Sampling ADC

_______________________________________________________________________________________ 7

-0.8

-0.6

-0.4

-0.2

0.2

0.4

0.6

0.8

-8192 -4096 0 4096 8192

INTEGRAL NONLINEARITY

vs. OUTPUT CODE

MAX1338 toc01

OUTPUT CODE (DECIMAL)

INL (LSB)

-0.6

-0.2

-0.4

0.2

0.4

0.6

-8192 0-4096 4096 8192

DIFFERENTIAL NONLINEARITY

vs. OUTPUT CODE

MAX1338 toc02

OUTPUT CODE (DECIMAL)

DNL (LSB)

-6

-4

-5

-2

-3

-1

4.75 4.954.85 5.05 5.15 5.25

OFFSET ERROR

vs. SUPPLY VOLTAGE

MAX1338 toc03

AVDD (V)

OFFSET ERROR (LSB)

CHANNEL 0

CHANNEL 2

CHANNEL 1

CHANNEL 3

-15

-5

-10

-40 10-15 35 60 85

OFFSET ERROR

vs. TEMPERATURE

MAX1338 toc04

TEMPERATURE (°C)

OFFSET (LSB)

GAIN ERROR

vs. SUPPLY VOLTAGE

MAX1338 toc05

SUPPLY VOLTAGE (V)

GAIN ERROR (%FS)

5.155.054.85 4.95

-0.20

-0.19

-0.18

-0.17

-0.16

-0.15

-0.14

-0.13

-0.21

4.75 5.25

CH1

CH2

CH3

CH0

REFERENCE ERROR NULLED

-0.15

-0.05

-0.10

0.05

0.10

0.15

-40 10-15 35 60 85

GAIN ERROR

vs. TEMPERATURE

MAX1338 toc06

TEMPERATURE (°C)

GAIN ERROR (%FS)

2000

1000

4000

3000

5000

6000

-2 0-1 1 2

OUTPUT HISTOGRAM

(DC INPUT)

MAX1338 toc07

DIGITAL OUTPUT CODE

COUNTS

1646.25

4584.25

1802.75

97.25

OFFSET NORMALIZED

-0.8

-0.6

-0.5

-0.4

-0.3

-0.2

-0.1

0.1

050100 150 200

ANALOG INPUT BANDWIDTH

MAX1338 toc08

fIN (kHz)

ATTENUATION (dB)

-0.7

Typical Operating Characteristics

(AVDD= DVDD= +5.0V, DRVDD= +3.0V, AGND = DGND = DRGND = 0, INTCLK/EXTCLK = AGND, f

CLK

= 5MHz, input range =

±10V, REFP2 = REFP1, REFN2 = REFN1, COM1 = COM2, 1.0nF from REFADC to AGND, 1.0µF and 0.1µF from COM1 to AGND,

0.1µF from REFP1 to AGND, 0.1µF from REFN1 to AGND, 1.0µF from REFP1 to REFN1.)

MAX1338

14-Bit, 4-Channel, Software-Programmable, Multiranging, Simultaneous-Sampling ADC

8 _______________________________________________________________________________________

-125

-100

-50

-75

-25

03015 45 60 75

FFT AT f

SAMPLE

= 150ksps, fIN = 10kHz

MAX1338 toc10

FREQUENCY (kHz)

AMPLITUDE (dB)

72 71

74 73

76 75

79 78

1 3452 678910

SIGNAL-TO-NOISE RATIO

vs. CLOCK FREQUENCY

MAX1338 toc11

CLK

(MHz)

SNR (dB)

72 71

74 73

76 75

79 78

1 3452 678910

SIGNAL-TO-NOISE PLUS DISTORTION

vs. CLOCK FREQUENCY

MAX1338 toc12

CLK

(MHz)

SNR (dB)

-110

-106

-108

-102

-104

-98

-100

-96

-92

-94

-90

1 3452 678910

TOTAL HARMONIC DISTORTION

vs. CLOCK FREQUENCY

MAX1338 toc13

CLK

(MHz)

THD (dB)

100

105

110

13245678910

SPURIOUS-FREE DYNAMIC RANGE

vs. CLOCK FREQUENCY

MAX1338 toc14

CLK

(MHz)

SFDR (dB)

73 72 71

2.0 2.42.2 2.6 2.8 3.0

SIGNAL-TO-NOISE RATIO

vs. REFERENCE VOLTAGE

MAX1338 toc15

REFADC

(V)

SNR (dB)

73 72 71

2.0 2.42.2 2.6 2.8 3.0

SIGNAL-TO-NOISE PLUS DISTORTION

vs. REFERENCE VOLTAGE

MAX1338 toc16

REFADC

(V)

SINAD (dB)

-105

-99

-101

-103

-97

-95

-93

-91

-89

-87

-85

2.0 2.42.2 2.6 2.8 3.0

TOTAL HARMONIC DISTORTION

vs. REFERENCE VOLTAGE

MAX1338 toc17

REFADC

(V)

THD (dB)

100

105

110

2.0 2.42.2 2.6 2.8 3.0

SPURIOUS-FREE DYNAMIC RANGE

vs. REFERENCE VOLTAGE

MAX1338 toc18

REFADC

(V)

SFDR (dB)

Typical Operating Characteristics (continued)

(AVDD= DVDD= +5.0V, DRVDD= +3.0V, AGND = DGND = DRGND = 0, INTCLK/EXTCLK = AGND, f

CLK

= 5MHz, input range =

±10V, REFP2 = REFP1, REFN2 = REFN1, COM1 = COM2, 1.0nF from REFADC to AGND, 1.0µF and 0.1µF from COM1 to AGND,

0.1µF from REFP1 to AGND, 0.1µF from REFN1 to AGND, 1.0µF from REFP1 to REFN1.)

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