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Maxim Integrated Semiconductor Electronic Components Datasheet


MAX11040

Sigma-Delta ADC



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MAX11040 pdf
19-4302; Rev 0; 5/09
www.DataSheEeVtA4ALUVUA.AcILoTAImOBNLEKIT
24-Bit, 4-Channel, Simultaneous-Sampling,
Cascadable, Sigma-Delta ADC
General Description
The MAX11040 is a 24-bit, 4-channel, simultaneous-
sampling, sigma-delta analog-to-digital converter
(ADC). The device allows simultaneous sampling of as
many as 32 channels using a built-in cascade feature
to synchronize as many as eight devices. The serial
interface of the MAX11040 allows reading data from all
the cascaded devices using a single command. Four
modulators simultaneously convert each fully differen-
tial analog input with a programmable data output rate
ranging from 0.25ksps to 64ksps. The device achieves
106dB SNR at 16ksps and 117dB SNR at 1ksps. The
MAX11040 operates from a single +3V supply. The dif-
ferential analog input range is ±2.2V when using the
internal reference, an external reference is optional.
Each input is overvoltage protected up to ±6V without
damage. The device uses an internal crystal oscillator
or an external source for clock.
The MAX11040 is compatible with SPI™, QSPI™,
MICROWIRE™, and DSP-compatible 4-wire serial inter-
faces. An on-board interface logic allows one serial inter-
face (with a single chip select) to control up to eight
cascaded devices or 32 simultaneous sampling analog
input channels.
The MAX11040 is ideally suited for power-management
systems. Each channel includes an adjustable sam-
pling phase enabling internal compensation for phase
shift due to external dividers, transformers, or filters at
the inputs. The output data rate is adjustable with a
0.065% resolution (at 16ksps or below) to track the
varying frequency of a periodic input. A SYNC input
allows periodic alignment of the conversion timing of
multiple devices with a remote timing source.
The MAX11040 is available in a 38-pin TSSOP package
specified over the -40°C to +105°C industrial tempera-
ture range.
Applications
Power Protection Relay Equipment
Multiphase Power Systems
Industrial Data-Acquisition Systems
Medical Instrumentation
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX11040GUU+ -40°C to +105°C
38 TSSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
MICROWIRE is a trademark of National Semiconductor Corp.
SPI/QSPI are trademarks of Motorola Inc.
Features
Four Fully Differential Simultaneously Sampled
Channels
Cascadable for Up to 32 Channels of
Simultaneous Sampling
106dB SNR at 16ksps
117dB SNR at 1ksps
0.25% Error Over a 1000:1 Dynamic Range,
Processed Over 16.7ms
±2.2V Full-Scale Input Range
±6V Overvoltage Protected Inputs
Internal Crystal Oscillator
2.5V, 50ppm/°C Internal Reference or External
Reference
Programmable Output Data Rate
0.25ksps to 64ksps Range
0.065% Resolution
Programmable Sampling Phase
0 to 333µs Delay in 1.33µs Steps
SPI-/QSPI-/MICROWIRE-/DSP-Compatible 4-Wire
Serial Interface
Cascadable Interface Allows Control of Up to
Eight Devices with a Single CS Signal
3.0V to 3.6V Analog Supply Voltage
2.7V to VAVDD Digital Supply Voltage
38-Pin TSSOP Package
Functional Diagram
AIN0+
AIN0-
REF0
AIN1+
AIN1-
REF1
AIN2+
AIN2-
REF2
AIN3+
AIN3-
REF3
REFIO
24-BIT
ADC
24-BIT
ADC
24-BIT
ADC
24-BIT
ADC
OVRFLW FAULT
DIGITAL
FILTER
DIGITAL
FILTER
DIGITAL
FILTER
REGISTERS AND
DIGITAL
CONTROL
DIGITAL
FILTER
SERIAL
INTERFACE
SYNC
DRDYIN
DRDYOUT
CASCIN
CASCOUT
CS
SCLK
DIN
DOUT
AGND
2.5V
REFERENCE
CRYSTAL
OSCILLATOR
MAX11040
XIN XOUT CLKOUT
DGND
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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.



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24-Bit, 4-Channel, Simultaneous-Sampling,
Cascadable, Sigma-Delta ADC
ABSOLUTE MAXIMUM RATINGS
AVDD to AGND ........................................................-0.3V to +4V
DVDD to DGND ......................................-0.3V to (VAVDD + 0.3V)
AGND to DGND.....................................................-0.3V to +0.3V
DIN, SCLK, CS, XIN, SYNC, DRDYIN,
CASCIN to DGND..............................-0.3V to (VDVDD + 0.3V)
DOUT, DRDYOUT, CASCOUT, CLKOUT,
XOUT to DGND..................................-0.3V to (VDVDD + 0.3V)
FAULT, OVRFLW to DGND ...................................-0.3V to +4.0V
AIN_+ to AIN_- ......................................................-6.0V to +6.0V
AIN_ _to AGND (VAVDD 3V, VDVDD 2.7V, FAULTDIS = 0,
SHDN = 0, fXIN CLOCK 20MHz)....................-6.0V to +6.0V
AIN_ _ to AGND (VAVDD < 3V or VDVDD < 2.7V or
FAULTDIS = 1 or SHDN = 1 or
fXIN CLOCK < 20MHz)........................................-3.5V to +3.5V
REFIO, REF_ to AGND............................-0.3V to (VAVDD + 0.3V)
Maximum Current into Any Pin............................................50mA
Continuous Power Dissipation (TA = +70°C)
38-Pin TSSOP (derated 13.7mW/°C above +70°C) ...1096mW
Operating Temperature Range .........................-40°C to +105°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(VAVDD = +3.0V to +3.6V, VDVDD = +2.7V to VAVDD, fXIN CLOCK = 24.576MHz, fOUT = 16ksps, VREFIO = +2.5V (external), CREFIO =
CREF0 = CREF1 = CREF2 = CREF3 = 1µF to AGND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
DC ACCURACY (Note 2)
Resolution
24 Bits
Differential Nonlinearity
DNL 24-bit no missing code
0.1 LSB
Integral Nonlinearity (Note 3)
Offset Error
INL TA = +25°C and +105°C
TA = -40°C
0.001
0.004
0.006
% FS
-1 +1 mV
Gain Error
(Note 4)
-1 +1 % FS
Offset-Error Drift
(Note 5)
0.5 ppm/°C
Gain-Error Drift
(Note 5)
10 ppm/°C
Change in Gain Error vs. fOUT
fOUT = 0.25ksps to 64ksps
< 0.025
% FS
Channel-to-Channel Gain Matching
0.03 % FS
DYNAMIC SPECIFICATIONS (62.5Hz sine-wave input, 2.17VP-P)
Signal-to-Noise Ratio
SNR (Note 6)
103 106
dB
Total Harmonic Distortion
Signal-to-Noise Plus Distortion
THD
SINAD
TA = +25°C and +105°C
TA = -40°C
TA = +25°C and +105°C
TA = -40°C
-94
dB
-90
93 98
89
dB
Spurious-Free Dynamic Range
Relative Accuracy (Note 7)
SFDR
TA = +25°C and +105°C
TA = -40°C
0.1% FS input
6.0% FS input
94 100
89
dB
0.25
0.005
%
Bandwidth
-3dB
3.4 kHz
Latency
(Note 8)
405 µs
Passband Flatness
From DC to 1.4kHz
< 0.1
dB
Amplitude-Dependent Phase Error
FS vs. 0.1% FS
< 0.01 0.12
Deg
Channel-to-Channel Phase Matching
0.0001
Deg
Phase-Error Drift
0.001
Deg
2 _______________________________________________________________________________________



Part Number MAX11040
Description Sigma-Delta ADC
Maker Maxim Integrated Products - Maxim Integrated Products
Total Page 30 Pages
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