Current Sense. AD7294 Datasheet

AD7294 Sense. Datasheet pdf. Equivalent


Part AD7294
Description DAC/ADC Temperature Sensor and Current Sense
Feature www.DataSheet4U.com 12-Bit, Multichannel, DAC/ADC Temperature Sensor and Current Sense for Monitor .
Manufacture Analog Devices
Datasheet
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AD7294
Data Sheet
12-Bit Monitor and Control System with Multichannel
ADC, DACs, Temperature Sensor, and Current Sense
AD7294
FEATURES
12-bit SAR ADC with 3 μs conversion time
4 uncommitted analog inputs
Differential/single-ended
VREF, 2 × VREF input ranges
2 high-side current sense inputs
5 V to 59.4 V operating range
0.5% max gain error
±200 mV input range
2 external diode temperature sensor inputs
−55°C to +150°C measurement range
±2°C accuracy
Series resistance cancellation
1 internal temperature sensor
±2°C accuracy
Built-in monitoring features
Minimum/maximum recorder for each channel
Programmable alert thresholds
Programmable hysteresis
Four 12-bit monotonic 15 V DACs
5 V span, 0 V to 10 V offset
8 μs settling time
10 mA sink and source capability
Power-on resets (POR) to 0 V
Internal 2.5 V reference
2-wire fast mode I2C interface
Temperature range: −40°C to +105°C
Package type: 64-lead TQFP or 56-lead LFCSP
APPLICATIONS
Cellular base stations
GSM, EDGE, UMTS, CDMA, TD-SCDMA, W-CDMA, WiMAX
Point-to-multipoint and other RF transmission systems
12 V, 24 V, 48 V automotive applications
Industrial controls
GENERAL DESCRIPTION
The AD7294 contains all the functions required for general-
purpose monitoring and control of current, voltage, and
temperature integrated into a single-chip solution. The device
includes low voltage (±200 mV) analog input sense amplifiers
for current monitoring across shunt resistors, temperature sense
inputs, and four uncommitted analog input channels multiplexed
into a SAR analog-to-digital converter (ADC) with a 3 μs conver-
sion time. A high accuracy internal reference is provided to drive
both the digital-to-analog converter (DAC) and ADC. Four 12-bit
DACs provide the outputs for voltage control. The AD7294 also
includes limit registers for alarm functions. The device is designed
on Analog Devices, Inc., high voltage DMOS process for high
voltage compliance, 59.4 V on the current sense inputs, and up
to a 15 V DAC output voltage.
The AD7294 is a highly integrated solution that offers all the
functionality necessary for precise control of the power amplifier
in cellular base station applications. In these types of applications,
the DACs provide 12-bit resolution to control the bias currents
of the power transistors. Thermal diode-based temperature sensors
are incorporated to compensate for temperature effects. The ADC
monitors the high-side current and temperature. All this function-
ality is provided in a 64-lead TQFP or a 56-lead LFCSP operating
over a temperature range of −40°C to +105°C.
Rev. I
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AD7294
AD7294
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 3
Functional Block Diagram .............................................................. 4
Specifications..................................................................................... 5
DAC Specifications....................................................................... 5
ADC Specifications ...................................................................... 6
General Specifications ................................................................. 8
Timing Characteristics ................................................................ 9
Absolute Maximum Ratings.......................................................... 10
Thermal Resistance .................................................................... 10
ESD Caution................................................................................ 10
Pin Configurations and Function Descriptions ......................... 11
Typical Performance Characteristics ........................................... 14
Terminology .................................................................................... 19
DAC Terminology ...................................................................... 19
ADC Terminology...................................................................... 19
Theory of Operation ...................................................................... 20
ADC Overview ........................................................................... 20
ADC Transfer Functions ........................................................... 20
Analog Inputs.............................................................................. 20
Current Sensor............................................................................ 22
Analog Comparator Loop ......................................................... 23
Temperature Sensor ................................................................... 24
DAC Operation........................................................................... 25
ADC and DAC Reference.......................................................... 25
VDRIVE Feature .............................................................................. 26
Register Setting ............................................................................... 27
Address Pointer Register ........................................................... 27
Command Register (0x00) ........................................................ 28
Result Register (0x01) ................................................................ 28
Data Sheet
TSENSE1, TSENSE2 Result Registers (0x02 and 0x03)........ 29
TSENSEINT Result Register (0x04) ........................................ 29
DACA,DACB, DACC, DACD, Registers (0x01 to 0x04)............... 30
Alert Status Register A (0x05), Register B (0x06), and
Register C (0x07)........................................................................ 30
Channel Sequence Register (0x08) .......................................... 30
Configuration Register (0x09).................................................. 31
Power-Down Register (0x0A)................................................... 32
DATAHIGH/DATALOW Registers: 0x0B, 0x0C (VIN0); 0x0E, 0x0F
(VIN1); 0x11, 0x12 (VIN2); 0x14, 0x15 (VIN3) .............................. 32
Hysteresis Registers: 0x0D (VIN0), 0x10 (VIN1), 0x13
(VIN2), 0x16 (VIN3) ................................................................. 32
TSENSE Offset Registers (0x26 and 0x27)................................... 33
I2C Interface .................................................................................... 34
General I2C Timing.................................................................... 34
Serial Bus Address Byte ............................................................. 35
Interface Protocol ....................................................................... 35
Modes of Operation ....................................................................... 39
Command Mode ........................................................................ 39
Autocycle Mode.......................................................................... 40
Alerts and Limits Theory .............................................................. 41
Alert_Flag Bit.............................................................................. 41
Alert Status Registers ................................................................. 41
DataHIGH and DataLOW Monitoring Features............................ 41
Hysteresis..................................................................................... 42
Applications Information .............................................................. 43
Base Station Power Amplifier Monitor and Control ............. 43
Gain Control of Power Amplifier............................................. 44
Layout and Configuration............................................................. 45
Power Supply Bypassing and Grounding................................ 45
Outline Dimensions ....................................................................... 46
Ordering Guide .......................................................................... 46
Rev. I | Page 2 of 47







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