MAX11040K, MAX11060* 24-/16-Bit, 4-Channel, Simultaneous-Sampling, Cascadable, Sigma-Delta ADCs 0 pages

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 reading
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 protected
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 interfaces.
An on-board interface logic allows one serial interface
(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 sampling
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 specified
over the -40°C to +105°C industrial temperature range.
Applications
Power-Protection Relay Equipment
Multiphase Power Systems
Industrial Data-Acquisition Systems
Medical Instrumentation
Features
Four Fully Differential Simultaneously Sampled
Channels
Cascadable for Up to 32 Channels of
Simultaneous Sampling
106dB (MAX11040K) SNR at 16ksps
117dB (MAX11040K) SNR at 1ksps
0.25% Error Over a 1000:1 Dynamic Range,
Processed Over 16.7ms (MAX11040K)
±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 333ìs Delay in 1.33ìs 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
MAX11040K/MAX11060
24-/16-Bit, 4-Channel, Simultaneous-Sampling,
Cascadable, Sigma-Delta ADCs
________________________________________________________________ Maxim Integrated Products 1
19-5741; Rev 0; 2/11
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.
EVALUATION KIT
AVAILABLE
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Future product—contact factory for availability.
PART TEMP RANGE PIN-PACKAGE
MAX11040KGUU+ -40°C to +105°C 38 TSSOP
MAX11060GUU+* -40°C to +105°C 38 TSSOP
MICROWIRE is a trademark of National Semiconductor Corp.
SPI/QSPI are trademarks of Motorola, Inc.
MAX11040K
MAX11060
24-/16-BIT
ADC
DIGITAL
FILTER
2.5V
REFERENCE
CRYSTAL
REFIO OSCILLATOR
AIN3+
AIN3-
REF3
24-/16-BIT
ADC
DIGITAL
FILTER
AIN2+
AIN2-
REF2
24-/16-BIT
ADC
DIGITAL
FILTER
AIN1+
AIN1-
REF1
24-/16-BIT
ADC
DIGITAL
FILTER
AIN0+
AIN0-
REF0
REGISTERS AND
DIGITAL
CONTROL
SERIAL
INTERFACE
DOUT
DIN
SCLK
CS
CASCOUT
CASCIN
DRDYOUT
DRDYIN
SYNC
OVRFLW FAULT
AGND XIN XOUT CLKOUT DGND
Functional Diagram