AMC7891 Datasheet, PDF (1/41 Pages) Texas Instruments – Analog Monitor and Control Circuit with 10-Bit, Multi-Channel ADC and Four DACs, Temperature Sensor, and 12 GPIOs

AMC7891
www.ti.com
SBAS518A – AUGUST 2011 – REVISED DECEMBER 2011
Analog Monitor and Control Circuit
with 10-Bit, Multi-Channel ADC and Four DACs, Temperature
Sensor, and 12 GPIOs
Check for Samples: AMC7891
FEATURES
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•23 10-Bit, 500-kSPS SAR ADC:
– 8 External Analog Inputs
– V_REF, 2 × V_REF Input Ranges
• Four 10-Bit Monotonic DACs:
– 0 to 5-V Output Range
– Up to 10-mA Sink and Source Capability
– Power-On Reset to 0 V
• Internal 2.5-V Reference
• Internal Temperature Sensor:
– –40°C to +125°C Operation
– Accuracy of ±2.5°C
• 12 General-Purpose I/O Ports:
– 1.8-V to 5.5-V Operation
• Low-Power SPI™-Compatible Serial Interface:
– 4-Wire Mode, 1.8-V to 5.5-V Operation
– SCLK up to 30 MHz
• Temperature Range: –40°C to +105°C
• Low Power: 32.5 mW at 5 V, Full Operating
Conditions
• Space-Saving Package: 36-pin,
6-mm x 6-mm QFN
AMC7891
2.5-V Reference
DAC
MUX
ADC
DAC
TEMP
SENSOR
DAC
DAC
GPIO Control
APPLICATIONS
• Cellular Base Stations
• RF Communication Systems
• Optical Networks
• General-Purpose Monitor and Control
DESCRIPTION
The AMC7891 is a highly-integrated, low-power,
complete analog monitoring and control system in a
very small package.
For monitoring functions, the AMC7891 has 8
uncommitted inputs multiplexed into a 10-bit SAR
analog-to-digital converter (ADC) and an accurate
on-chip temperature sensor. Control signals are
generated through four, independent, 10-bit
digital-to-analog converters (DACs). Additional digital
signal monitoring and control is accomplished through
twelve configurable GPIOs. An internal reference can
be used to drive the ADC and DACs.
Communication to the device is performed through a
versatile, four-wire serial interface compatible with
industry-standard
microprocessors
and
microcontrollers. The serial interface can operate at
clock rates up to 30 MHz, allowing quick access to
critical system data.
The device is characterized for operation over the
temperature range of –40ºC to 105ºC and is available
in a very small, 36-pin, 6-mm x 6-mm QFN package.
The AMC7891’s low power, small size and
high-integration make it an ideal low-cost, bias control
circuit for modern RF transistor modules such as the
power amplifiers (PA) and low-noise amplifiers (LNA)
found in RF communication systems. The AMC7891
feature set is similarly beneficial in general purpose
monitor and control systems.
For applications that require a different channel
count, additional features, or converter resolutions,
Texas Instruments offers a complete family of Analog
Monitor and Control (AMC) Products. See
http://www.ti.com/amc.
12 GPIOs
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SPI is a trademark of Motorola, Inc.
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All other trademarks are the property of their respective owners.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011, Texas Instruments Incorporated