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PDF ( 数据手册 , 数据表 ) AD7293

零件编号 AD7293
描述 12-Bit Power Amplifier Current Controller
制造商 Analog Devices
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AD7293 数据手册, 描述, 功能
Data Sheet
12-Bit Power Amplifier Current Controller with
ADC, DACs, Temperature and Current Sensors
AD7293
FEATURES
4 closed-loop power amplifier (PA) drain current controllers
Built-in PA protection, sequencing, and alert features
Compatible with both depletion mode and enhancement mode
power amplifiers
Highly integrated
4 uncommitted 12-bit analog-to-digital converter (ADC) inputs
±0.5 LSB typical integral nonlinearity (INL)
Eight 12-bit voltage digital-to-analog converters (DACs)
1.3 μs maximum settling
4 high-side current sense amplifiers, ±0.1% gain error
2 external temperature sensor inputs, ±1.1°C accuracy
Internal temperature sensor, ±1.25°C accuracy
2.5 V on-chip reference
Flexible monitoring and control ranges
ADC input ranges: 0 V to 1.25 V, 0 V to 2.5 V, and 0 V to 5 V
Bipolar DAC ranges: 0 V to +5 V, −4 V to +1 V, and −5 V to 0 V
Bipolar DAC reset and clamping relative to VCLAMPx voltage
Unipolar DAC ranges: 0 V to 5 V, 2.5 V to 7.5 V, and 5 V to 10 V
Current sense gain: 6.25, 12.5, 25, 50, 100, and more
Adjustable closed-loop setpoint ramp time
High-side voltage current sensing
4 current sense inputs
4 V to AVSS + 60 V, ±200 mV input range
Small package and flexible interface
Serial port interface (SPI) with VDRIVE supporting 1.8 V, 3 V, and
5 V interfaces
56-lead LFCSP
Temperature range: −40°C to +125°C
APPLICATIONS
GaN and GaAs power amplifier monitoring and controls
Base station power amplifiers
General-purpose system monitoring and controls
GENERAL DESCRIPTION
The AD7293 is a PA drain current controller containing
functionality for general-purpose monitoring and control of
current, voltage, and temperature, integrated into a single chip
solution with an SPI-compatible interface.
The device features a 4-channel, 12-bit successive approximation
register (SAR) ADC, eight 12-bit DACs (four bipolar and four
unipolar with output ranges that can be configured to shut
down under external pin control), a ±1.25°C accurate internal
temperature sensor, and eight general-purpose input/output
(GPIO) pins.
Rev. A
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or 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.
SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM
PRECISION
2.5V
REFERENCE
×
1
2
1.25V
2.5V
BIPOLAR
DAC
PMOS
CONTROL
AD7293
+Σ
PAVDD
PA_ON
MUX
12-BIT
SAR ADC
ALERT
AND LIMIT
REGISTERS
0V TO +5V
–4V TO +1V
–5V TO 0V
UNIPOLAR
D0+ DAC
0V TO 5V
2.5V TO 7.5V
D0– 5V TO 10V
D1+
D1–
RESET
SPI
LOGIC INTERFACE
CONTROL
LOGIC
DIGITAL
LDAC AND
INPUT/OUTPUT CLAMP CONTROL
Figure 1.
The device also includes limit registers for alert functions and four
high-side current sense amplifiers to measure current across
external shunt resistors. These amplifiers can be optionally set to
operate as part of four independent closed-loop drain current
controllers.
A high accuracy 2.5 V internal reference is provided to drive the
DACs and the ADC. The 12-bit ADC monitors and digitizes the
internal temperature sensor, and two inputs are included for the
external diode temperature sensors.
Note that throughout this data sheet, multifunction pins, such
as GPIO4/ALERT1, are referred to either by the entire pin name
or by a single function of the pin, for example, ALERT1, when
only that function is relevant.
PRODUCT HIGHLIGHTS
1. Four independent closed-loop drain current controllers.
2. Built-in monitoring, sequencing, and alert features.
3. Compatible with both depletion mode and enhancement
mode power amplifiers.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com







AD7293 pdf, 数据表
Data Sheet
AD7293
Parameter
Unipolar DAC Short-Circuit Current
Bipolar DAC Short-Circuit Current
Load Current2
Capacitive Load Stability
DC Output Impedance
AC CHARACTERISTICS
Output Voltage Settling Time2
Slew Rate2
Digital Feedthrough2
DAC to DAC Crosstalk2, 3
Output Noise Spectral Density2, 3
Min
−10
Output Noise2, 3
CLAMP INPUTS
Clamp Output Voltage2
Gain Error
Input Referred Offset Error
VCLAMP0 and VCLAMP1 Input Current
Clamp Voltage Range
Output Current2
Clamp to Open-Loop Settling Time2
AVSS
−10
Typ
40
42
10
1
1.2
7.5
0.1
0.2
55
110
102
135
−3 ×
VCLAMP0,
VCLAMP1
0.2
5
±1
Max
+10
1.3
0
+10
5
Unit
mA
mA
mA
nF
Ω
Test Conditions/Comments
Shorted to AGND or DACVDD-UNI
Shorted to AVSS or DACVDD-BI
Source and/or sink within 300 mV of supply
RL = ∞
Midscale
µs
V/µs
nV-sec
nV-sec
nV/√Hz
nV/√Hz
µV p-p
µV p-p
V
¼ to ¾ change within ±1 LSB, measured from
the last SCLK rising edge, CL = 200 pF
fIN = 10 kHz, bipolar
fIN = 10 kHz, unipolar
Bipolar
Unipolar
Controlled by SLEEP0 and SLEEP1 digital pins
BI-VOUTx = −3 × VCLAMP0, VCLAMP1
% Within 200 mV of AVSS
mV
µA
V
mA Source and/or sink within 300 mV of supply
µs RL = ∞, CL = 200 pF, output voltage within 10%,
5 V transition
1 Specification tested with output unloaded. Linearity calculated using best fit line method and based on a reduced code range equivalent to 100 mV within either side
of supply or ground ± 82 codes.
2 Guaranteed by design and characterization; not production tested.
3 All unipolar DACs must be enabled with an output code set to a minimum code of 41 LSBs.
TEMPERATURE SENSOR
AVDD, DVDD, DACVDD-BI = 4.5 V to 5.5 V (connect AVDD and DACVDD-BI to the same potential), DACVDD-UNI = 5 V, AVSS = −5 V, PAVDD =
5 V, AGND = DGND = 0 V, VREFIN = 2.5 V internal or external; VDRIVE = 1.7 V to 5.5 V; TA = −40°C to +125°C, unless otherwise noted.
Table 3.
Parameter
Min Typ Max Unit Test Conditions/Comments
INTERNAL TEMPERATURE SENSOR1
Operating Range2
−40 +125 °C See Figure 30 for −55°C to +125°C operation
Accuracy
Resolution
±1.25 ±3 °C Internal temperature sensor, TA = −40°C to +125°C
±1.25
°C TA = 25°C
0.125
°C
EXTERNAL TEMPERATURE SENSOR1
External transistor = 2N3906; no capacitor between Dx−/Dx+ pins, and
no series resistor between transistor and Dx−/Dx+ pins
Operating Range
−55 +150 °C Limited by external transistor
Accuracy
Resolution
±1.1 ±3 °C TA = −40°C to +105°C
0.125
°C LSB size
1 Guaranteed by design and characterization; not production tested.
2 Guaranteed functional to −55°C by design but accuracy is not guaranteed.
Rev. A | Page 7 of 77







AD7293 equivalent, schematic
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
0
–20 fIN = 1.005kHz
–40
–60
–80
–100
NONCOHERENT SAMPLING
SEVEN-TERM BLACKMAN-HARRIS WINDOW USED
M = 131072 SAMPLES
fS = 131.072kHz
fIN = 1.005kHz
SNR = 72.6366dB
THD = –91.63dB
–120
–140
–160
–180
0
10 20 30 40 50 60
FREQUENCY (kHz)
Figure 8. Signal-to-Noise Ratio, Single-Ended Input, 2 × REFADC Range
0
–20
–40
–60
–80
–100
fIN = 1.005kHz
NONCOHERENT SAMPLING
SEVEN-TERM BLACKMAN-HARRIS WINDOW USED
M = 131072 SAMPLES
fS = 131.072kHz
fIN = 1.005kHz
SNR = 73.5961dB
THD = –90.23dB
–120
–140
–160
–180
0
10 20 30 40 50 60
FREQUENCY (kHz)
Figure 9. Signal-to-Noise Ratio, Differential Input, REFADC Range
1.0
M = 131072 SAMPLES
0.8 fS = 131.072kHz
fIN = 1.005kHz
0.6 RUNS = 20
EFFECTIVE SAMPLES = 2621440
0.4 HITS/CODE = 640
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
500 1000 1500 2000 2500 3000 3500
CODE
Figure 10. ADC DNL Single-Ended, REFADC Range
4000
AD7293
1.0
M = 131072 SAMPLES
0.8 fS = 131.072kHz
fIN = 1.005kHz
0.6 RUNS = 20
EFFECTIVE SAMPLES = 2621440
0.4 HITS/CODE = 640
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
500 1000 1500 2000 2500 3000 3500
CODE
Figure 11. ADC INL Single-Ended, REFADC Range
4000
2.5
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–2.5
–40 –20
0
20 40 60 80 100
TEMPERATURE (°C)
Figure 12. ADC Zero Code Error vs. Temperature
120
0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–4.5
–5.0
–5.5
–6.0
–6.5
–40 –20
0
20 40 60 80
TEMPERATURE (°C)
100 120
Figure 13. ADC Full-Scale Error vs. Temperature
140
Rev. A | Page 15 of 77










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