EVALUATION KIT AVAILABLE
MAX11321–MAX11328
1Msps, 10-/12-Bit, 4-/8-/16-Channel ADCs with
Post-Mux External Signal Conditioning Access
General Description
Benefits and Features
The MAX11321–MAX11328 are 12-/10-bit with external
reference and 500kHz, full-linear-bandwidth, high-speed,
low-power, serial-output successive approximation reg-
ister (SAR) analog-to-digital converters (ADCs). The
MAX11321–MAX11328 provide external access to the
output of the integrated mux and ADC input, to simplify
conditioning. The MAX11321–MAX11328 include both
internal and external clock modes. These devices feature
scan mode in both internal and external clock modes. The
internal clock mode features internal averaging to increase
SNR. The external clock mode features the SampleSetK
technology, a user-programmable analog input channel
sequencer. The SampleSet approach provides greater
sequencing flexibility for multichannel applications while
alleviating significant microcontroller or DSP (controlling
unit) communication overhead.
S Highly Integrated Precision ADC Saves Space
While Retaining Flexibility
ꢀ±± ꢀSꢁ IꢂꢀL ±± ꢀSꢁ DꢂꢀL ꢂo ꢃissing Codes
ꢀ70dꢁ SIꢂAD at ±00kHz
ꢀ±ꢃsps Conversion Rate with ꢂo Pipeline Delay
S
Analog ꢃultiplexer with True Differential Track/Hold:
Any Combination of Single-EndedL Differential and
Pseudo-Differential Input Pin Pairs Allowed
ꢀ±6-/8-/4-Channel Single-Ended
ꢀ±2-/8-/4-Channel Fully-Differential Pairs
ꢀ±5-/8-/4-Channel Pseudo-Differential Relative to
a Common Input
S Two Software-Selectable ꢁipolar Input Ranges:
±ꢄ +/2L ±ꢄ
+
REF
REF
S External Differential Reference (±ꢄ to ꢄ
S 32-PinL 5mm x 5mm TQFꢂ Package
)
DD
External pins provide access to the output of the
multiplexer and ADC inputs to simplify multichannel sig-
nal conditioning. The internal clock mode features an inte-
grated FIFO allowing data to be sampled at high speeds
and then held for readout at any time or at a lower clock
rate. Internal averaging is also supported in internal clock
mode improving SNR for noisy input signals. The devices
feature analog input channels that can be configured to
be single-ended inputs, fully differential pairs, or pseudo-
differential inputs with respect to one common input. The
MAX11321–MAX11328 operate from a 2.35V to 3.6V sup-
ply and consume only 5.4mW at 1Msps.
S SampleSet™ Technology ꢁrings Extreme
Flexibility to Program Input Configurations Per
Channel and Sampling Sequence to Optimize
Interface to the ꢃicrocontroller
ꢀUser-Defined Channel Sequence with ꢃaximum
ꢀength of 256
ꢀScan ꢃodesL Internal AveragingL and Internal Clock
ꢀ±6-Entry First-In/First-Out (FIFO)
S Post-ꢃux Signal Access Allows for External
Signal Conditioning ꢁetween the ꢃux and the
ADC Even for Differential Signals
The MAX11321–MAX11328 include AutoShutdownK,
fast wake-up, and a high-speed 3-wire serial interface.
The devices feature full power-down mode for optimal
power management. The 48MHz, 3-wire serial interface
ꢀExternally Accessible ꢃultiplex Output and ADC Input
S ꢀow-Power Consumption Extends ꢁattery ꢀife for
Portable Applications
M
directly connects to SPI, QSPIK, and MICROWIRE
ꢀ±.5ꢄ to 3.6ꢄ Digital I/O Supply ꢄoltage
ꢀ2.35ꢄ to 3.6ꢄ Supply ꢄoltage
ꢀ5.4mW at ±ꢃsps with 3ꢄ Supplies
ꢀ2μA Full-Shutdown Current
devices without external logic.
Excellent dynamic performance, low voltage, low power,
ease of use, and small package size make these convert-
ers ideal for portable battery-powered data-acquisition
applications, and for other applications that demand low
power consumption and small space.
S Easy to Interface with ꢃost ꢃicrocontrollers
ꢀ±6ꢃHzL 3-Wire SPI-/QSPI-/ꢃICROWIRE-/DSP-
Compatible Serial Interface
The MAX11321–MAX11328 are available in 32-pin, 5mm
x 5mm, TQFN packages and operate over the -40NC to
+125NC temperature range.
Applications
High-Speed Data
Medical Instrumentation
Acquisition Systems
SampleSet and AutoShutdown are trademarks of Maxim
Integrated Products, Inc.
QSPI is a trademark of Motorola, Inc.
MICROWIRE is a registered trademark of National Semiconductor
Corp.
Battery-Powered
Instruments
High-Speed Closed-Loop
Systems
Portable Systems
Industrial Control Systems
Ordering Information appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-6467; Rev 1; 12/14
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