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PDF AD7294-2 Data sheet ( Hoja de datos )
| Número de pieza | AD7294-2 | |
| Descripción | 12-Bit Monitor and Control System | |
| Fabricantes | Analog Devices | |
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Data Sheet
12-Bit Monitor and Control System with Multichannel
ADC, DACs, Temperature Sensor, and Current Sense
AD7294-2
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
0.75% maximum 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 reset (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
Pin compatible with the AD7294
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 AD7294-2 contains all the functions that are required for
general-purpose monitoring and control of current, voltage,
and temperature, integrated into a single-chip solution. The part
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
conversion time. A high accuracy internal reference is provided
to drive both the digital-to-analog converters (DACs) and the
ADC. Four 12-bit DACs provide the outputs for voltage control.
The AD7294-2 also includes limit registers for alarm functions.
The part is designed for high voltage compliance: 59.4 V on the
current sense inputs and up to a 15 V DAC output voltage.
The AD7294-2 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. This functionality
is provided in a 64-lead TQFP, which operates over a temperature
range of −40°C to +105°C.
Rev. 0
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD7294-2
Data Sheet
SPECIFICATIONS
DAC SPECIFICATIONS
AVDD = 4.5 V to 5.5 V, AGND1 to AGND7 = DGND = 0 V, internal 2.5 V reference; VDRIVE = 2.7 V to 5.5 V; TA = −40°C to +105°C, unless
otherwise noted. DAC OUTV+ AB and DAC OUTV+ CD = 4.5 V to 16.5 V; OFFSET IN x is floating; therefore, the DAC output span = 0 V
to 5 V.
Table 1.
Parameter
ACCURACY1
Resolution
Relative Accuracy (INL)
Differential Nonlinearity (DNL)
Zero-Code Error
Full-Scale Error
Offset Error
Min
12
Offset Error Temperature
Coefficient
Gain Error
Gain Error Drift
DAC OUTPUT CHARACTERISTICS
Output Voltage Span
Output Voltage Offset
0
0
Offset Input Pin Range
DC Input Impedance2
Output Voltage Settling Time2
0
Slew Rate2
Short-Circuit Current2
Load Current2
Capacitive Load Stability2
DC Output Impedance2
REFERENCE
Reference Output Voltage
Reference Input Voltage Range
Input Current
Input Capacitance2
VREF Output Impedance2
10
2.49
0
Reference Temperature
Coefficient
Typ
±1
±0.3
2.5
±5
±0.025
±5
75
8
1.1
40
±10
1
2.5
400
20
5
10
Max Unit Test Conditions/Comments
±3
±1
6
10
±4
±2
±0.155
Bits
LSB
LSB
mV
mV
mV
mV
ppm/°C
Guaranteed monotonic
DAC OUTV+ = 5.5 V
Measured in the linear region, TA = −40°C to +105°C
Measured in the linear region, TA = 25°C
% FSR
ppm/°C
2 × VREF
10
V
V
5V
kΩ
µs
V/µs
mA
mA
nF
Ω
0 V to 5 V for a 2.5 V reference
The output voltage span can be positioned in the 0 V to 15 V
range; if the OFFSET IN x pin is left floating, the offset =
2/3 × VREF, giving an output of 0 V to 2 × VREF
VOUT = 3 × VOFFSET − 2 × VREF + VDAC
100 kΩ to VREF, and 200 kΩ to AGND; see Figure 45
1/4 to 3/4 change within 1/2 LSB, measured from last
SCL edge
Full-scale current shorted to ground
Source and/or sink within 200 mV of supply
RL = ∞
2.51
AVDD − 2
480
25
V
V
µA
pF
Ω
ppm/°C
±0.2% maximum at 25°C, AVDD = 5 V
VREF = 2.5 V
A buffer is required if the reference output is used to drive
external loads
1 Linearity calculated using a reduced code range: Code 10 to Code 4095.
2 Guaranteed by design and characterization; not production tested.
Rev. 0 | Page 4 of 44
5 Page 
AD7294-2
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Data Sheet
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
NC 1
RS2(–) 2
RS2(+) 3
NC 4
NC 5
AGND1 6
AGND2 7
NC 8
D2(–) 9
D2(+) 10
D1(+) 11
D1(–) 12
AGND3 13
FACTORY TEST 14
REFOUT/REFIN DAC 15
NC 16
PIN 1
INDICATOR
AD7294-2
TQFP
TOP VIEW
(Not to Scale)
48 DGND
47 DGND
46 ISENSE1 OVERRANGE
45 ISENSE2 OVERRANGE
44 RESET
43 DGND
42 VDRIVE
41 OPGND
40 SCL
39 SDA
38 AS0
37 AS1
36 AS2
35 ALERT/BUSY
34 AGND5
33 NC
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
NOTES
1. NC = NO INTERNAL CONNECTION.
Figure 4. Pin Configuration
Table 7. Pin Function Descriptions
Pin No. Mnemonic
Description
2, 61 RS2(−), RS1(−) Connection for External Shunt Resistor.
3, 60 RS2(+), RS1(+) Connection for External Shunt Resistor.
1, 4, 5, 8,
16, 17, 25,
32, 33, 57
59, 64
NC
This pin has no internal connection.
14
FACTORY TEST
Factory Test Pin. To maintain pin compatibility with the AD7294, this pin can tolerate being connected to
voltages of up to 5.5 V.
56 AVDD
Analog Supply Pin. The operating range is 4.5 V to 5.5 V. This pin provides the supply voltage for all the
analog circuitry on the AD7294-2. This supply should be decoupled to AGND with one 10 μF tantalum
capacitor and a 0.1 μF ceramic capacitor.
6, 7, 13,
24, 34,
55, 58
AGND1 to AGND7
Analog Ground. Ground reference point for all analog circuitry on the AD7294-2. Refer all analog input
signals and any external reference signal to this AGND voltage. Connect all seven of these AGND pins to
the AGND plane of the system. Note that AGND5 is a DAC ground reference point and should be used as
a star ground for circuitry being driven by the DAC outputs. Ideally, the AGND and DGND voltages should
be at the same potential and must not be more than 0.3 V apart, even on a transient basis.
9, 12 D2(−), D1(−)
Temperature Sensor Analog Inputs. These pins are connected to the external temperature sensing
transistor. See Figure 43 and Figure 44.
10, 11
D2(+), D1(+)
Temperature Sensor Analog Inputs. These pins are connected to the external temperature sensing
transistor. See Figure 43 and Figure 44.
15 REFOUT/REFIN DAC DAC Reference Output/Input Pin. The REFOUT/REFIN DAC pin is common to all four DAC channels. On
power-up, the default configuration of this pin is as an external reference (REFIN). Enable the internal
reference by writing to the power-down register; see Table 27. Decoupling capacitors (220 nF
recommended) are connected to this pin to decouple the reference buffer. If the output is buffered, the
on-chip reference can be taken from this pin and applied externally to the rest of a system. A maximum
external reference voltage of AVDD − 2 V can be supplied to the REFOUT portion of the REFOUT/REFIN DAC pin.
Rev. 0 | Page 10 of 44
11 Page | ||
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| PDF Descargar | [ Datasheet AD7294-2.PDF ] | |
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