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AMC7891 Datasheet Preview

AMC7891 Datasheet

Analog Monitor/Controller

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AMC7834
SLAS972B – NOVEMBER 2014 – REVISED MARCH 2016
AMC7834 12-Bit Integrated Power-Amplifier Monitor and Control System with
Temperature, Current and Voltage Supervision Capabilities
1 Features
1 Eight Monotonic 12-bit DACs With Programmable
Ranges
– Four Bipolar DACs:
–4 to 1 V, –5 to 0 V, and 0 to 5 V
– Four Unipolar DACs:
0 to 5 V, and 2.5 to 7.5 V
– High Current Drive Capability: up to ±10 mA
– Selectable Clamp Voltage
• Multi-Channel 12-bit SAR ADC
– Four External Analog Inputs: 0 to 2.5 V Range
– Four Internal Inputs for Bipolar DAC Monitoring
– Programmable Out-of-Range Alarms
• Four High-Side Current-Sense Amplifiers
– Common Mode Voltages: 4 to 60 V
– Optional Closed-Loop Drain-Current Controller
Operation
• Temperature Sensing Capabilities
– Internal Temperature Sensor
– Two Remote Temperature-Diode Drivers
• Internal 2.5 V Reference
• Four General-Purpose I/O Ports (GPIOs)
• Low-Power SPI-Compatible Serial Interface
– 4-Wire Mode, 1.7 to 3.6 V Operation
• Operating Temperature Range: –40°C to +125°C
• Available in a 56-Pin VQFN Package
2 Applications
• Communications Infrastructure:
– Cellular Base Stations
– Microwave Backhaul
– Optical Networks
• General-Purpose Monitor and Control
• Data Acquisition Systems
3 Description
The AMC7834 device is a highly-integrated, low-
power, analog monitoring and control solution for
power-amplifier (PA) biasing capable of temperature,
current and voltage supervision.
The device integrates a multi-channel, 12-bit analog-
to-digital converter (ADC); eight, 12-bit digital-to-
analog converters (DAC); four high-side current-
sense amplifiers that can be optionally set to operate
as part of four independent closed-loop drain-current
controllers; an accurate on-chip temperature sensor
and two remote temperature-sensor diode drivers;
four configurable general-purpose I/O ports (GPIOs);
and an accurate internal reference. The high level of
integration significantly reduces component count and
simplifies PA-biasing system designs.
The function integration and wide operating-
temperature range of the device make it suitable as
an all-in-one, low-cost, bias control-circuit for PAs
found in multi-channel RF communication systems.
The flexible DAC output ranges and wide common
mode voltage current sensors allow the device to be
used as a biasing solution for a large variety of
transistor technologies such as LDMOS, GaAs, and
GaN. The AMC7834 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. For more
information, go to www.ti.com/amc.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
AMC7834
VQFN (56)
8.00 mm × 8.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
AMC7834
Remote
Sensor
Driver
Temperature
Sensor
2.5-V Reference
ADC
DAC
DAC
AUXDAC
GPIO Control
AUXDAC
4 GPIOs
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




etcTI

AMC7891 Datasheet Preview

AMC7891 Datasheet

Analog Monitor/Controller

No Preview Available !

AMC7834
SLAS972B – NOVEMBER 2014 – REVISED MARCH 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 4
6 Specifications......................................................... 7
6.1 Absolute Maximum Ratings ...................................... 7
6.2 ESD Ratings.............................................................. 7
6.3 Recommended Operating Conditions....................... 8
6.4 Thermal Information .................................................. 8
6.5 Electrical Characteristics—DAC Specifications ........ 9
6.6 Electrical Characteristics—ADC, Current and
Temperature Sensor Specifications......................... 11
6.7 Electrical Characteristics—General Specifications . 12
6.8 Serial Interface Timing Requirements..................... 13
6.9 Switching Characteristics—DAC Specifications...... 14
6.10 Switching Characteristics—ADC, Current and
Temperature Sensor Specifications......................... 14
6.11 Switching Characteristics—General
Specifications ........................................................... 15
6.12 Typical Characteristics .......................................... 16
7 Detailed Description ............................................ 24
7.1 Overview ................................................................. 24
7.2 Functional Block Diagram ....................................... 25
7.3 Feature Description................................................. 26
7.4 Device Functional Modes ....................................... 47
7.5 Programming........................................................... 51
7.6 Register Maps ......................................................... 52
8 Application and Implementation ........................ 77
8.1 Application Information............................................ 77
8.2 Typical Application ................................................. 78
8.3 Initialization Set Up ................................................. 82
9 Power Supply Recommendations...................... 82
10 Layout................................................................... 82
10.1 Layout Guidelines ................................................. 82
10.2 Layout Example .................................................... 83
11 Device and Documentation Support ................. 85
11.1 Documentation Support ........................................ 85
11.2 Community Resources.......................................... 85
11.3 Trademarks ........................................................... 85
11.4 Electrostatic Discharge Caution ............................ 85
11.5 Glossary ................................................................ 85
12 Mechanical, Packaging, and Orderable
Information ........................................................... 85
4 Revision History
Changes from Revision A (April 2015) to Revision B
Page
• deleted text from the Description of pin 1 in the Pin Functions table " If unused the pin requires a 10 kΩ pullup
resistor to the IOVDD pin." ....................................................................................................................................................... 5
• Added: Bipolar DACs in AVSS clamp mode To the Clamp Output Mode section of Electrical Characteristics—DAC
Specifications ....................................................................................................................................................................... 10
• Deleted text from the Accuracy Test Conditions: "32 Samples Average" in Electrical Characteristics—ADC, Current
and Temperature Sensor Specifications ............................................................................................................................. 11
• Added: AVDD alarm threshold to Electrical Characteristics—General Specifications .......................................................... 12
• Changed the IIOVDD (Power-Mode 10) TYP value From: 1 µA To 1.75 µA in Electrical Characteristics—General
Specifications ....................................................................................................................................................................... 13
• Changed the IIOVDD (Power-Mode 00) TYP value From: 0.2 µA To 1.75 µA in Electrical Characteristics—General
Specifications........................................................................................................................................................................ 13
• Added Figure 29 .................................................................................................................................................................. 19
• Changed Figure 45............................................................................................................................................................... 27
• Added text to the itemized list in DAC Clamp Operation: "If the output buffer is inactive the clamp voltage is fixed to
AVSS.".................................................................................................................................................................................... 29
• Added text to the end of DAC Clamp Operation: "Additionally, in the unique case..."......................................................... 29
• Changed text in paragraph 1 of ADC Sequencing From: "The AMC7834 supports autonomous ADC conversion" To:
The AMC7834 supports autonomous and direct-mode conversions..." ............................................................................... 31
• Change the paragraph: "Once the conversion cycle starts..." in ADC Sequencing ............................................................. 31
• Deleted text from paragraph 3 of ADC Sequencing: "The first conversion sequence is reserved for calibration and
the corresponding ADC results should be ignored."............................................................................................................. 31
• Added text to the last paragraph of ADC Sequencing: "In direct-mode conversion the DAV/ADC_RDY pin ... for
each channel group. "........................................................................................................................................................... 33
• Added text to paragraph 3 of Drain Switch Control: The PA_ON signal state is also triggered by the AVDD
monitoring circuit................................................................................................................................................................... 39
2 Submit Documentation Feedback
Product Folder Links: AMC7834
Copyright © 2014–2016, Texas Instruments Incorporated


Part Number AMC7891
Description Analog Monitor/Controller
Maker etcTI
Total Page 30 Pages
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