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PDF AD8333 Data sheet ( Hoja de datos )
| Número de pieza | AD8333 | |
| Descripción | Dual I/Q Demodulator and Phase Shifter | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
DC to 50 MHz, Dual I/Q Demodulator and
Phase Shifter
AD8333
FEATURES
Dual integrated I/Q demodulator
16 phase select options on each output (22.5° per step)
Quadrature demodulation accuracy
Phase accuracy: ±0.1°
Amplitude balance: ±0.05 dB
Bandwidth
4 × LO: 10 kHz to 200 MHz
RF: dc to 50 MHz
Baseband: determined by external filtering
Output dynamic range: 159 dB/Hz
LO drive > 0 dBm (50 Ω); 4 × LO > 1 MHz
Supply: ±5 V
Power consumption: 190 mW/channel (380 mW total)
Power-down
APPLICATIONS
Medical imaging (CW ultrasound beamforming)
Phased array systems (radar and adaptive antennas)
Communication receivers
GENERAL DESCRIPTION
The AD83331 is a dual phase-shifter and I/Q demodulator that
enables coherent summing and phase alignment of multiple
analog data channels. It is the first solid-state device suitable for
beamformer circuits, such as those used in high performance
medical ultrasound equipment featuring CW Doppler. The RF
inputs interface directly with the outputs of the dual-channel,
low noise preamplifiers included in the AD8332.
A divide-by-4 circuit generates the internal 0° and 90° phases
of the local oscillator (LO) that drive the mixers of a pair of
matched I/Q demodulators.
The AD8333 can be applied as a major element in analog
beamformer circuits in medical ultrasound equipment.
The AD8333 features an asynchronous reset pin. When used
in arrays, the reset pin sets all the LO dividers in the same state.
Sixteen discrete phase rotations in 22.5° increments can be selected
independently for each channel. For example, if Channel 1 is used
as a reference and the RF signal applied to Channel 2 has an I/Q
phase lead of 45°, Channel 2 can be phase aligned with Channel 1
by choosing the correct code.
1 Protected by US Patent 7,760,833.
FUNCTIONAL BLOCK DIAGRAM
PH12
PH13
COMM
CH 1 ΦSEL
LOGIC
4LOP
4LON
BUF ÷4
PH23
PH22
CH 2 ΦSEL
LOGIC
0°
90°
90°
0°
BIAS
Φ
Φ
Φ
Φ
I1NO
I1PO
Q1PO
Q1NO
Q2NO
Q2PO
I2PO
I2NO
Figure 1.
Phase shift is defined by the output of one channel relative to
another. For example, if the code of Channel 1 is adjusted to
0000 and that of Channel 2 is adjusted to 0001 and the same
signal is applied to both RF inputs, the output of Channel 2
leads that of Channel 1 by 22.5°.
The I and Q outputs are provided as currents to facilitate sum-
mation. The summed current outputs are converted to voltages
by a high dynamic range, current-to-voltage (I-V) converter, such
as the AD8021, configured as a transimpedance amplifier. The
resultant signal is then applied to a high resolution ADC, such as
the AD7665 (16 bit/570 kSPS).
The two I/Q demodulators can be used independently in other
nonbeamforming applications. In that case, a transimpedance
amplifier is needed for each of the I and Q outputs, four in total
for the dual I/Q demodulator.
The dynamic range is 159 dB/Hz at the I and Q outputs, but the
following transimpedance amplifier is an important element in
maintaining the overall dynamic range, and attention needs to
be paid to optimal component selection and design.
The AD8333 is available in a 32-lead LFCSP (5 mm × 5 mm)
package for the industrial temperature range of −40°C to +85°C.
Rev. F
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 ©2005–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD8333
Data Sheet
SPECIFICATIONS
VS = ±5 V, TA = 25°C, f4LO = 20 MHz, fRF = 5.01 MHz, fBB = 10 kHz, PLO ≥ 0 dBm, single-ended, sine wave; per channel performance, dBm
(50 Ω), unless otherwise noted (see Figure 41).
Table 1.
Parameter
OPERATING CONDITIONS
LO Frequency Range
RF Frequency Range
Baseband Bandwidth
LO Input Level
VSUPPLY (VS)
Temperature Range
DEMODULATOR PERFORMANCE
RF Differential Input Impedance
LO Differential Input Capacitance
Transconductance
Dynamic Range
Maximum RF Input Swing
Peak Output Current (No Filtering)
Input P1dB
Third-Order Intermodulation (IM3)
Equal Input Levels
Unequal Input Levels
Third-Order Input Intercept (IP3)
LO Leakage
Conversion Gain
Input-Referred Noise
Output Current Noise
Noise Figure
Bias Current
LO Common-Mode Voltage Range
RF Common-Mode Voltage
Output Compliance Range
PHASE ROTATION PERFORMANCE
Phase Increment
Quadrature Phase Error
I/Q Amplitude Imbalance
Channel-to-Channel Matching
Test Conditions/Comments
Min Typ
Max Unit
4× internal LO at Pin 4LOP and Pin 4LON
Square wave
Sine wave, see Figure 22
Mixing
Limited by external filtering
See Figure 22
0.01
2
DC
DC
0
±4.5 ±5
−40
200 MHz
200 MHz
50 MHz
50 MHz
13 dBm
±6 V
+85 °C
Demodulated IOUT/VIN, each I or Q output after low-pass
filtering measured from RF inputs, all phases
IP1dB, input-referred noise (dBm)
Differential; inputs biased at 2.5 V; Pin RFxP and Pin RFxN
0° phase shift
45° phase shift
Reference = 50 Ω
Reference = 1 V rms
fRF1 = 5.010 MHz, fRF2 = 5.015 MHz, fLO = 5.023 MHz
Baseband tones: −7 dBm at 8 kHz and 13 kHz
Baseband tones: −1 dBm at 8 kHz and −31 dBm at 13 kHz
fRF1 = 5.010 MHz, fRF2 = 5.015 MHz, fLO = 5.023 MHz
Measured at RF inputs, worst phase, measured into 50 Ω
(limited by measurement)
Measured at baseband outputs, worst phase, AD8021 disabled,
measured into 50 Ω
All codes
Output noise/conversion gain
Output noise ÷ 787 Ω
With AD8332 LNA
RS = 50 Ω, RFB = ∞
RS = 50 Ω, RFB = 1.1 kΩ
RS = 50 Ω, RFB = 274 Ω
Pin 4LOP and Pin 4LON
Pin RFxP and Pin RFxN
Pin 4LOP and Pin 4LON (each pin)
For maximum differential swing; Pin RFxP and Pin RFxN
(dc-coupled to AD8332 LNA output)
Pin IxPO and Pin QxPO
One channel is reference; the other channel is stepped
16 phase steps per channel
I1xO to Q1xO and I2xO to Q2xO, 1σ
I1xO to Q1xO and I2xO to Q2xO, 1σ
Phase match I1xO/I2xO and Q1xO/Q2xO; −40°C < TA < 85°C
Amplitude match I1xO/I2xO and Q1xO/Q2xO; −40°C < TA < 85°C
0.2
−1.5
−2
6.7||6.5
0.6
2.17
159
2.8
±4.7
±6.6
14.5
1.5
−75
−77
30
<−97
−60
4.7
10
22
7.8
9.0
11.0
−3
−70
3.8
2.5
+0.7
22.5
±0.1
±0.05
±1
±0.25
+2
kΩ||pF
pF
mS
dB/Hz
V p-p
mA
mA
dBm
dBV
dBc
dBc
dBm
dBm
dBm
dB
nV/√Hz
pA/√Hz
dB
dB
dB
µA
µA
V
V
V
Degrees
Degrees
dB
Degrees
dB
Rev. F | Page 4 of 32
5 Page 
AD8333
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
1M
10M
RF FREQUENCY (Hz)
100M
Figure 14. Representative Range of Quadrature Phase Errors vs.
RF Frequency, Channel 1 or Channel 2, All Codes
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
100
1k 10k
BASEBAND FREQUENCY (Hz)
100k
Figure 15. Representative Range of Quadrature Phase Error vs. Baseband
Frequency, Channel 1 and Channel 2 (see Figure 43)
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
1M
10M 50M
RF FREQUENCY (Hz)
Figure 16. Representative Range of I/Q Amplitude Imbalance vs.
RF Frequency, Channel 1 or Channel 2, All Codes
Data Sheet
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
100
1k 10k
BASEBAND FREQUENCY (Hz)
100k
Figure 17. Representative Range of I/Q Amplitude Imbalance vs.
Baseband Frequency, Channel 1 and Channel 2 (see Figure 43)
2.0
CODE 0000
–40°C
1.5 +25°C
+85°C
1.0 CODE 0001
–40°C
+25°C
0.5 +85°C
fBB = 10kHz
I2/I1 DISPLAYED
0
CODE 0010
–0.5 –40°C
+25°C
+85°C
–1.0
CODE 0011
–40°C
–1.5 +25°C
+85°C
–2.0
1M
10M 50M
RF FREQUENCY (Hz)
Figure 18. Typical I2xO/I1xO or Q2xO/Q1xO Amplitude Match vs. RF Frequency,
First Quadrant, at Three Temperatures
8
CODE 0000
–40°C
6
+25°C
+85°C
CODE 0001
4
–40°C
+25°C
+85°C
CODE 0010
–40°C
+25°C
+85°C
CODE 0011
–40°C
+25°C
+85°C
2
0
–2
fBB = 10kHz
I2/I1 DISPLAYED
–4
1M
10M
50M
RF FREQUENCY (Hz)
Figure 19. I2xO/I1xO or Q2xO/Q1xO Phase Error vs. RF Frequency,
Baseband Frequency = 10 kHz, at Three Temperatures
Rev. F | Page 10 of 32
11 Page | ||
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| PDF Descargar | [ Datasheet AD8333.PDF ] | |
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