MAX11040K Datasheet, PDF (1/35 Pages) Maxim Integrated Products – 24-/16-Bit, 4-Channel, Simultaneous-Sampling, Cascadable, Sigma-Delta ADCs

19-5741; Rev 1; 4/11
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24-/16-Bit, 4-Channel, Simultaneous-Sampling,
Cascadable, Sigma-Delta ADCs
General Description
The MAX11040K/MAX11060 are 24-/16-bit, 4-channel,
simultaneous-sampling, sigma-delta analog-to-digital
converters (ADCs). The devices allow 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 devices allows read-
ing data from all the cascaded devices using a single
command. Four modulators simultaneously convert
each fully differential analog input with a programmable
data output rate ranging from 0.25ksps to 64ksps. The
devices achieve 106dB SNR at 16ksps and 117dB SNR
at 1ksps (MAX11040K). The devices operate from a
single +3V supply. The differential analog input range is
±2.2V when using the internal reference; an external
reference is optional. Each input is overvoltage protect-
ed up to ±6V without damage. The devices use an
internal crystal oscillator or an external source for clock.
The devices are 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 devices are 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 devices are available in a 38-pin TSSOP package speci-
fied over the -40°C to +105°C industrial temperature range.
Applications
Power-Protection Relay Equipment
Multiphase Power Systems
Industrial Data-Acquisition Systems
Medical Instrumentation
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX11040KGUU+ -40°C to +105°C 38 TSSOP
MAX11060GUU+ -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
o Four Fully Differential Simultaneously Sampled
Channels
o Cascadable for Up to 32 Channels of
Simultaneous Sampling
o 106dB (MAX11040K) SNR at 16ksps
o 117dB (MAX11040K) SNR at 1ksps
o 0.25% Error Over a 1000:1 Dynamic Range,
Processed Over 16.7ms (MAX11040K)
o ±2.2V Full-Scale Input Range
o ±6V Overvoltage Protected Inputs
o Internal Crystal Oscillator
o 2.5V, 50ppm/°C Internal Reference or External
Reference
o Programmable Output Data Rate
0.25ksps to 64ksps Range
0.065% Resolution
o Programmable Sampling Phase
0 to 333µs Delay in 1.33µs Steps
o SPI-/QSPI-/MICROWIRE-/DSP-Compatible 4-Wire
Serial Interface
o Cascadable Interface Allows Control of Up to
Eight Devices with a Single CS Signal
o 3.0V to 3.6V Analog Supply Voltage
o 2.7V to V_AVDD Digital Supply Voltage
o 38-Pin TSSOP Package
Functional Diagram
AIN0+
AIN0-
REF0
AIN1+
AIN1-
REF1
AIN2+
AIN2-
REF2
AIN3+
AIN3-
REF3
REFIO
OVRFLW FAULT
24-/16-BIT
ADC
DIGITAL
FILTER
24-/16-BIT
ADC
24-/16-BIT
ADC
DIGITAL
FILTER
DIGITAL
FILTER
REGISTERS AND
DIGITAL
CONTROL
24-/16-BIT
ADC
DIGITAL
FILTER
SERIAL
INTERFACE
SYNC
DRDYIN
DRDYOUT
CASCIN
CASCOUT
CS
SCLK
DIN
DOUT
AGND
2.5V
REFERENCE
CRYSTAL
OSCILLATOR
MAX11040K
MAX11060
XIN XOUT CLKOUT
DGND
________________________________________________________________ Maxim Integrated Products 1
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