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PDF AD7292 Data sheet ( Hoja de datos )
| Número de pieza | AD7292 | |
| Descripción | 10-Bit Monitor and Control System | |
| Fabricantes | Analog Devices | |
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Data Sheet
10-Bit Monitor and Control System with ADC,
DACs, Temperature Sensor, and GPIOs
AD7292
FEATURES
10-bit SAR ADC
8 multiplexed analog input channels
Single-ended mode of operation
Differential mode of operation
5 V analog input range
VREF, 2 × VREF, or 4 × VREF input ranges
Input measured with respect to AGND or VDD
4 monotonic, 10-bit, 5 V DACs
2 µs settling time
Power-on reset to 0 V
10 mA sink and source capability
Internal temperature sensor
±1°C accuracy
12 general-purpose digital I/O pins
Internal 1.25 V reference
Built-in monitoring features
Minimum and maximum value register for each channel
Programmable alert thresholds
Programmable hysteresis
SPI interface
Temperature range: −40°C to +125°C
Package type: 36-lead LFCSP
APPLICATIONS
Base station power amplifier (PA) monitoring and control
RF control loops
Optical communication system control
General-purpose system monitoring and control
GENERAL DESCRIPTION
The AD7292 contains all the functionality required for general-
purpose monitoring of analog signals and control of external
devices, integrated into a single-chip solution. The AD7292
features an 8-channel, 10-bit SAR ADC, four 10-bit DACs, a
±1°C accurate internal temperature sensor, and 12 GPIOs to
aid system monitoring and control.
The 10-bit, high speed, low power successive approximation
register (SAR) ADC is designed to monitor a variety of single-
ended input signals. Differential operation is also available by
configuring VIN0 and VIN1 to operate as a differential pair.
The AD7292 offers a register programmable ADC sequencer,
which enables the selection of a programmable sequence of
channels for conversion.
FUNCTIONAL BLOCK DIAGRAM
REFOUT
REFIN DVDD AVDD VDRIVE
TEMPERATURE
SENSOR
VIN0
VIN1
VIN2
VIN3
VIN4
VIN5
VIN6
VIN7
MUX T/H
BUF
1.25V
REF
÷4
BUF
10-BIT
SAR ADC
CONTROL
LOGIC
ALERT AND LIMIT
REGISTERS
AD7292
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
VOUT0
VOUT1
VOUT2
VOUT3
DIGITAL I/Os
SPI
INTERFACE
Figure 1.
Four 10-bit digital-to-analog converters (DACs) provide outputs
from 0 V to 5 V. An internal, high accuracy, 1.25 V reference
provides a separately buffered reference source for both the ADC
and the DACs.
A high accuracy band gap temperature sensor is monitored and
digitized by the 10-bit ADC to give a resolution of 0.03125°C.
The AD7292 also features built-in limit and alarm functions.
The AD7292 is a highly integrated solution offered in a 36-lead
LFCSP package with an operating temperature range of −40°C
to +125°C.
Rev. A
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 ©2012–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD7292
Data Sheet
Parameter
EXTERNAL REFERENCE
Reference Input Voltage
Input Resistance
1 Specifications also apply to differential mode.
Min
4.75
Typ Max
AVDD
100
Unit Test Conditions/Comments
V Internal reference used to calibrate
temperature sensor
kΩ
DAC SPECIFICATIONS
AVDD = 4.75 V to 5.25 V, DVDD = 1.8 V to 5.25 V, VREF = 1.25 V internal, VDRIVE = 1.8 V to 5.25 V, AGND = 0 V, TA = −40°C to +125°C,
unless otherwise noted.
Table 2.
Parameter
DC ACCURACY
Resolution
Integral Nonlinearity (INL)
Differential Nonlinearity (DNL)
Zero-Scale Error
Full-Scale Error
Offset Error
Offset Error Drift
Gain Error
Gain Error Drift
DC Power Supply Rejection Ratio (PSRR)
DC Crosstalk
DAC OUTPUT CHARACTERISTICS
Output Voltage Range
Short-Circuit Current
Load Current
Resistive Load to AGND
Capacitive Load Stability
DC Output Impedance
AC CHARACTERISTICS1
Output Voltage Settling Time
Overshoot
Min
10
0
Slew Rate
Digital-to-Analog Glitch Impulse
Digital Feedthrough
DAC-to-DAC Crosstalk
Output Noise Spectral Density
Output Noise
Output Transient Response During
Power-Up
9
Typ
±0.2
±0.1
4.8
±0.1
±1.62
±4.4
±0.35
±2.6
−50
5
±30
±10
500
1
1
200
12
4
0.4
2
730
28
5
Max
±1
±0.3
±10
±0.5
±10
±0.5
4 × VREF
1
2
Unit
Bits
LSB
LSB
mV
% FS
mV
ppm/°C
% FS
ppm/°C
dB
μV
V
mA
mA
Ω
nF
Ω
µs
mV
V/µs
nV-sec
nV-sec
nV-sec
nV/√Hz
μV rms
mV
Test Conditions/Comments
Guaranteed monotonic
All 0s loaded to DAC register
All 1s loaded to DAC register
Measured in the linear region,
TA = −40°C to +125°C
Measured in the linear region, TA = 25°C
fRIPPLE up to 100 kHz
Sink/source current; within ±200 mV
of supply
¼ to ¾ scale step change within 1 LSB,
measured from last SCLK edge
¼ to ¾ scale step change within 1 LSB,
measured from last SCLK edge;
CL = 200 pF, RL = 25 kΩ
DAC code = midscale, 1 kHz
0.1 Hz to 10 Hz
AVDD ramp of 1 ms with 100 kΩ load
1 The DAC buffer output level is undefined until 30 µs after all supplies reach their minimum specified operating voltages.
Rev. A | Page 4 of 40
5 Page 
AD7292
TYPICAL PERFORMANCE CHARACTERISTICS
0
AVDD = 5V
–20
DVDD = 5V
VDRIVE = 3V
TA = 25°C
–40
fSAMPLE = 200kSPS
RANGE = 0V TO VREF
SINGLE-ENDED MODE
SNR = 61.6dB
–60 THD = –84.0dB
SINAD = 61.49dB
SFDR = 79.05dB
–80
–100
–120
0 10 20 30 40 50 60 70 80 90 100
INPUT FREQUENCY (kHz)
Figure 4. ADC FFT, 200 kSPS, fIN = 10 kHz, Single-Ended Mode
0.3
AVDD = DVDD = 5.25V
VDRIVE = 1.8V
CHANNEL 3
0.2 INTERNAL REFERENCE
TA = 25°C
WCP INL = 0.068LSB
WCN INL = –0.255LSB
0.1 SINGLE-ENDED MODE, 0V TO 4 × VREF RANGE
0
–0.1
–0.2
–0.3
0
128 256 384 512 640 768 896
ADC CODE
Figure 5. Typical ADC INL, Single-Ended Mode
1024
0.3
AVDD = DVDD = 5.25V TA = 25°C
VDRIVE = 1.8V
WCP DNL = 0.11LSB
0.2 CHANNEL 3
WCN DNL = –0.119LSB
INTERNAL REFERENCE
SINGLE-ENDED MODE, 0V TO 4 × VREF RANGE
0.1
0
–0.1
–0.2
–0.3
0
128 256 384 512 640 768 896
ADC CODE
Figure 6. Typical ADC DNL, Single-Ended Mode
1024
Data Sheet
0
AVDD = 5V
–20
DVDD = 5.25V
VDRIVE = 1.8V
TA = 25°C
–40
fSAMPLE = 200kSPS
RANGE = 0V TO 2 × VREF
DIFFERENTIAL MODE
SNR = 61.798dB
–60 THD = –86.602dB
SINAD = 61.784dB
SFDR = 86.142dB
–80
–100
–120
0 10 20 30 40 50 60 70 80 90 100
INPUT FREQUENCY (kHz)
Figure 7. ADC FFT, 200 kSPS, fIN = 10 kHz, Differential Mode
0.3
AVDD = 4.75V
TA = 25°C
DVDD = 5.25V
WCP INL = 0.091LSB
0.2
VDRIVE = 3.3V
WCN INL = –0.093LSB
CHANNEL 0 AND CHANNEL 1
INTERNAL REFERENCE
0.1 DIFFERENTIAL MODE, 0V TO VREF RANGE
0
–0.1
–0.2
–0.3
0
128 256 384 512 640 768 896
ADC CODE
Figure 8. Typical ADC INL, Differential Mode
1024
0.25
0.20
0.15
0.10
0.05
AVDD = 4.75V
TA = 25°C
DVDD = 5.25V
WCP INL = 0.067LSB
VDRIVE = 3.3V
WCN INL = –0.08LSB
CHANNEL 0 AND CHANNEL 1
INTERNAL REFERENCE
DIFFERENTIAL MODE, 0V TO VREF RANGE
0
–0.05
–0.10
–0.15
–0.20
–0.25
0
128 256 384 512 640 768 896
ADC CODE
Figure 9. Typical ADC DNL, Differential Mode
1024
Rev. A | Page 10 of 40
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AD7292.PDF ] | |
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