AD8331ARQ ,Single VGA with Ultralow Noise Preamplifier and Programmable RINapplications. Excellent bandwidth uniformity is maintained across the entire range. The gain contro ..
AD8332 ,Dual VGA with Ultralow Noise Preamplifier and Programmable RINapplications. Excellent bandwidth uniformity is overload to a subsequent ADC. An external resistor ..
AD8332ARU ,Dual VGA with Ultralow Noise Preamplifier and Programmable RINGENERAL DESCRIPTION 0.4V100.2VThe AD8331/AD8332 are single- and dual-channel ultralow 0noise, linea ..
AD8334ACPZ ,Quad VGA with Ultralow Noise Preamplifier and Programmable RINapplications.− the operating level of the detec-+tor. Then an example applica-ERRORtion revolving a ..
AD8335ACPZ ,Quad Low Noise, Low Cost Variable Gain Amplifierapplications, the PrAs can be powered down, significantly of ×8 (18.06 dB) and accepts input signal ..
AD8335ACPZ-REEL7 ,Quad Low Noise, Low Cost Variable Gain AmplifierFEATURES Low noise preamplifier (PrA) Voltage noise = 1.3 nV/√Hz typical 61 60 59 58 53 55 52 51 49 ..
ADP3300ARTZ-5REEL7 ,High Accuracy anyCAP® 50 mA Low Dropout Linear RegulatorSpecifications subject to change without notice.–2– REV. BADP3300ABSOLUTE MAXIMUM RATINGS* PIN FUNC ..
ADP3300ARTZ-5-REEL7 ,High Accuracy anyCAP® 50 mA Low Dropout Linear Regulator®High Accuracy anyCAPa50 mA Low Dropout Linear RegulatorADP3300
ADP3301 ,Variable Resolution Resolver-to-Digital ConverterSpecifications subject to change without notice.REV. 0–2–ADP3301ABSOLUTE MAXIMUM RATINGS* PIN FUNCT ..
ADP3301AR-3 ,High Accuracy anyCAP⑩ 100 mA Low Dropout Linear RegulatorGENERAL DESCRIPTIONcurrent levels from 50 mA to 300 mA:The ADP3301 is a member of the ADP330x famil ..
ADP3301AR-3 ,High Accuracy anyCAP⑩ 100 mA Low Dropout Linear RegulatorSpecifications subject to change without notice.REV. 0–2–ADP3301ABSOLUTE MAXIMUM RATINGS* PIN FUNCT ..
ADP3301AR-3.2 ,High Accuracy anyCAP® 100 mA Low Dropout Linear RegulatorFEATURESFUNCTIONAL BLOCK DIAGRAMHigh Accuracy (Over Line and Load Regulationsat +258C): 60.8%ADP330 ..
AD8331ARQ-AD8332ARU
Single VGA with Ultralow Noise Preamplifier and Programmable RIN
Ultralow Noise VGAs with
Preamplifier and Programmable RIN
Rev. C
FEATURES
Ultralow noise preamplifier
Voltage noise = 0.74 nV/√Hz
Current noise = 2.5 pA/√Hz
3 dB bandwidth: 120 MHz
Low power: 125 mW/channel
Wide gain range with programmable postamp
–4.5 dB to +43.5 dB
+7.5 dB to +55.5 dB
Low output-referred noise: 48 nV/√Hz typical
Active input impedance matching
Optimized for 10-/12-bit ADCs
Selectable output clamping level
Single 5 V supply operation
Available in space-saving chip scale package
APPLICATIONS
Ultrasound and sonar time-gain control
High performance AGC systems
I/Q signal processing
High speed dual ADC driver
GENERAL DESCRIPTION The AD8331/AD8332 are single- and dual-channel ultralow
noise, linear-in-dB, variable gain amplifiers. Although optimized
for ultrasound systems, they are usable as low noise variable
gain elements at frequencies up to 120 MHz.
Each channel consists of an ultralow noise preamplifier (LNA),
an X-AMP® VGA with 48 dB of gain range, and a selectable gain
postamplifier with adjustable output limiting. The LNA gain is
19 dB with a single-ended input and differential outputs capable
of accurate, programmable active input impedance matching by
selecting an external feedback resistor. Active impedance
control optimizes noise performance for applications that
benefit from input matching.
The 48 dB gain range of the VGA makes these devices suitable
for a variety of applications. Excellent bandwidth uniformity is
maintained across the entire range. The gain control interface
provides precise linear-in-dB scaling of 50 dB/V for control
voltages between 40 mV and 1 V. Factory trim ensures excellent
part-to-part and channel-to-channel gain matching. Differential
signal paths lead to superb second and third order distortion
performance and low crosstalk.
FUNCTIONAL BLOCK DIAGRAM
VOL1
VPSV
VOH1
COM1
ENB
VPS126COM2
INH2
LMD2
INH1
LMD1
VPS2
VIN1VIP1LOP1LON1
VIN2VIP2LOP2LON2
VOL2
VOH2
GAIN
RCLMPCOMM
HILOVCM2VCM1578141811Figure 1. AD8332 Shown 28-Lead TSSOP
(d
FREQUENCY(Hz)
100k–201M1G100M10MFigure 2. Frequency Response vs. Gain
The VGA’s low output-referred noise is advantageous in driving
high speed differential ADCs. The gain of the postamplifier may
be pin selected to 3.5 dB or 15.5 dB to optimize gain range and
output noise for 12-bit or 10-bit converter applications. The
output may be limited to a user-selected clamping level,
preventing input overload to a subsequent ADC. An external
resistor adjusts the clamping level.
The operating temperature range is –40°C to +85°. The
AD8331 is available in a 20-lead QSOP package, and the
AD8332 in 28-lead TSSOP and 32-lead LFCSP packages. They
require a single 5 V supply, and the quiescent power
consumption is 125 mW/ch. A power-down (enable) pin is
provided.
TABLE OF CONTENTS REVISION HISTORY..................................................................2
AD8331, AD8332—Specifications..................................................3
Absolute Maximum Ratings............................................................6
ESD CAUTION............................................................................6
AD8331, AD8332—Typical Performance Characteristics..........7
Test Circuits.....................................................................................15
Theory of Operation......................................................................17
Overview......................................................................................17
Low Noise Amplifier (LNA)......................................................17
Variable Gain Amplifier.............................................................19
Postamplifier...............................................................................21
Applications.....................................................................................22
LNA – External Components...................................................22
Driving ADCs.............................................................................24
Overload......................................................................................24
Optional Input Overload Protection.......................................25
Layout, Grounding, And Bypassing.........................................25
Multiple Input Matching...........................................................25
Disabling the LNA......................................................................25
Measurement Considerations...................................................26
Ultrasound TGC Application...................................................26
Pin Configuration and Function Descriptions...........................30
AD8331........................................................................................30
AD8332........................................................................................31
Outline Dimensions.......................................................................32
Ordering Guide..........................................................................32
REVISION HISTORY
Revision C
11/03—Data Sheet Changed from REV. B to REV. C Addition of New Part...........................................................Universal
Changes to Figures ...............................................................Universal
Updated Outline Dimensions..........................................................32
5/03—Data Sheet Changed from REV. A to REV. B Edits to Ordering Guide....................................................................32
Edits to Ultrasound TGC Application section................................25
Added Figure 71, Figure 72, and Figure 73......................................26
Updated Outline Dimensions............................................................31
2/03—Data Sheet Changed from REV. 0 to REV. A Edits to Ordering Guide.....................................................................32
AD8331, AD8332—SPECIFICATIONS
Table 1. TA = 25°C, VS = 5 V, RL = 500 Ω, RS = RIN = 50 Ω, RFB = 280 Ω, CSH = 22 pF, f = 10 MHz, RCLMP = ∞, CL = 1 pF,
VCM pin floating, –4.5 dB to +43.5 dB gain (HILO = LO), and differential output voltage, unless otherwise specified.
ABSOLUTE MAXIMUM RATINGS
Table 2. Absolute Maximum Ratings Four-Layer JEDEC Board (2S2P).
5 Exposed pad soldered to board, nine thermal vias in pad — JEDEC 4-Layer
Board J-STD-51-9.
Stresses above those listed under the Absolute Maximum
Ratings may cause permanent damage to the device. This is a
stress rating only; functional operation of the device at these or
any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the
human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
AD8331, AD8332—TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, VS = 5 V, RL = 500 Ω, RS = RIN = 50 Ω, RFB = 280 Ω, CSH = 22 pF, f = 10 MHz, RCLMP = ∞, CL = 1 pF, VCM = 2.5 V,
–4.5 dB to +43.5 dB gain (HILO = LO), and differential signal voltage, unless otherwise specified. 0.2
VGAIN(V)
(d
–1003199-C-003
Figure 3. Gain vs. VGAIN and MODE (MODE Available on AC Package)
9-C
GAIN E
RROR (dB)
VGAIN(V)
–2.01.00.81.1
Figure 4. Absolute Gain Error vs. VGAIN at Three Temperatures
GAIN E
RROR (dB)
VGAIN (V)
–2.01.00.81.103199-C-005
Figure 5. Absolute Gain Error vs. VGAIN at Various Frequencies
O
GAIN ERROR(dB)
0.40–0.3–0.20.1–0.4–0.50.30.20.503199-C-006
Figure 6. Gain Error Histogram
% OF UNITS
CHANNEL-TO-CHANNEL GAIN MATCH(dB)
–0.09–0.07–0.05–0.0303199-C-007
Figure 7. Gain Match Histogram for VGAIN = 0.2 V and 0.7 V
100k–20
FREQUENCY(Hz)1G100M10M03199-C-008
Figure 8. Frequency Response for Various Values of VGAIN
FREQUENCY (Hz)
GAIN (
–101G100k100M10M03199-C-009
Figure 9. Frequency Response for Various Values of VGAIN, HILO = HI
GAIN (
–201G100k100M10M03199-C-010
FREQUENCY(Hz) Figure 10. Frequency Response for Various Matched Source Impedances
FREQUENCY (Hz)
(d
–201G100k100M10M03199-C-011
Figure 11. Frequency Response, Unterminated, RS = 50 Ω
FREQUENCY(Hz)
–20100k100M10M
–8003199-C-012
Figure 12. Channel-to-Channel Crosstalk vs.
Frequency for Various Values of VGAIN
FREQUENCY(Hz)100k100M10M003199-C-013
GROUP DELAY (Figure 13. Group Delay vs. Frequency
–1003199-C-014
VGAIN (V)
OFFSET VOLTA
GE (Figure 14. Representative Differential Output Offset Voltage vs. VGAIN at Three
Temperatures
% TOTAL
GAIN SCALING FACTOR50.449.649.749.849.950.050.150.250.33003199-B
Figure 15. Gain Scaling Factor Histogram
100k1M
0.110M100M
FREQUENCY(Hz)
IM03199-C-016
Figure 16. Output Impedance vs. Frequency
FREQUENCY(Hz)
IM
(Ω
10k100k100M10M03199-C-017
Figure 17. LNA Input Impedance vs. Frequency for
Various Values of RFB and CSH
25j
–25j
50j
–50j
–100j
RIN = 50Ω
RFB = 270ΩRIN = 75Ω,
RFB = 412Ω
RIN = 100Ω,
RFB = 549Ω
RIN = 6kΩ,
RFB =03199-B
Figure 18. Smith Chart, S11 vs. Frequency, 0.1 MHz to 200 MHz
for Various Values of RFB
FREQUENCY (Hz)
10M
(d
100k
100M1M–20
–1503199-C-019
Figure 19. LNA Frequency Response,
Single-Ended, for Various Values of RIN
FREQUENCY (Hz)
10M
(d
100k
100M1M–20
–1503199-C-020
Figure 20. LNA Frequency Response, Unterminated, Single-Ended
VGAIN(V)
0.20.803199-C-021
Figure 21. Output-Referred Noise vs. VGAIN
10M0100M100k
FREQUENCY(Hz)
0.203199-C-022
Figure 22. Short-Circuit Input-Referred Noise vs. Frequency
0.4
VGAIN(V)
(n03199-C-023
Figure 23. Short-Circuit Input-Referred Noise vs. VGAIN
TEMPERATURE(°C)–30–50–107050300.50
0.5503199-C-024
Figure 24. Short-Circuit Input-Referred Noise vs. Temperature
0.11001k
SOURCE RESISTANCE(Ω)03199-C-025
Figure 25. Input-Referred Noise vs. RS
5100501k
SOURCE RESISTANCE(Ω)03199-C-026
Figure 26. Noise Figure vs. RS for Various Values of RIN
0.2VGAIN(V)
0.10.50.30.90.703199-C-027
Figure 27. Noise Figure vs. VGAIN
20
GAIN(dB)25456030504003199-C-028
Figure 28. Noise Figure vs. Gain
HARM
DIS
100M1M10M
FREQUENCY(Hz)03199-C-029
Figure 29. Harmonic Distortion vs. Frequency
20080006004001.0k2.0k1.8k1.6k1.4k1.2k
RLOAD(Ω)03199-C-030
Figure 30. Harmonic Distortion vs. RLOAD
CLOAD (pF)03199-C-031
Figure 31. Harmonic Distortion vs. CLOAD
VOUT(V p-p)03199-C-032
Figure 32. Harmonic Distortion vs. Differential Output Voltage
DISTORTION (
Bc)
–12003199-C-033
VGAIN(V)
0.10.20.30.40.50.60.70.80.91.0Figure 33. Harmonic Distortion vs. VGAIN, f = 1 MHz
VGAIN(V)
0.10.20.30.40.50.60.70.80.91.003199-C-034
DISTORTION (
Bc)Figure 34. Harmonic Distortion vs. VGAIN, f = 10 MHz
VGAIN (V)03199-C-035
Figure 35. Input 1 dB Compression vs. VGAIN
100M
FREQUENCY (Hz)
10M
–2003199-C-036
Figure 36. IMD3 vs. Frequency
IP
VGAIN (V)
0.10.400.30.21.00.90.80.70.60.503199-C-037
Figure 37. Output Third Order Intercept vs. VGAIN
C-038
Figure 38. Small Signal Pulse Response, G = 30 dB,
Top: Input, Bottom: Output Voltage, HILO = HI or LO
03199-C-039
Figure 39. Large Signal Pulse Response, G = 30 dB,
HILO = HI or LO, Top: Input, Bottom: Output Voltage
–10–300–20–26040205030–407003199-C-040
OUT
(V
TIME (ns)Figure 40. Large Signal Pulse Response for
Various Capacitive Loads, CL = 0 pF, 10 pF, 20 pF, 50 pF
03199-B
Figure 41. Pin GAIN Transient Response,
Top: VGAIN, Bottom: Output Voltage
RCLMP(kΩ)03199-C-042
Figure 42. Clamp Level vs. RCLMP
TIME(ns)
–10200–460405003199-C-043
Figure 43. Clamp Level Pulse Response
03199-B
Figure 44. LNA Overdrive Recovery, VINH 0.05 V p-p to
1 V p-p Burst, VGAIN = 0.27 V, VGA Output Shown
03199-B
Figure 45. VGA Overdrive Recovery, VINH 4 mV p-p to 70 mV p-p Burst,
VGAIN = 1 V, VGA Output Shown Attenuated 24 dB
03199-B
Figure 46. VGA Overdrive Recovery, VINH 4 mV p-p to 275 mV p-p Burst,
VGAIN = 1 V, VGA Output Shown Attenuated 24 dB
03199-B
Figure 47. Enable Response, Top: VENB, Bottom: VOUT, VINH = 30 mV p-p
03199-B
Figure 48. Enable Response, Large Signal,
Top: VENB, Bottom: VOUT, VINH = 150 mV p-p
FREQUENCY(Hz)100k100M10M–80
–7003199-C-049
Figure 49. PSRR vs. Frequency (No Bypass Capacitor)
0–40–20
10080602003199-C-050
TEMPERATURE (°C)
QUIE
T S
CURRE
NT (mA)Figure 50. Quiescent Supply Current vs. Temperature
TEST CIRCUITS
1.8nF
22pF
0.1µF03199-C-051
*FERRITE BEAD
NETWORK ANALYZER
28Ω
28Ω
1:1
270ΩFigure 51. Gain and Bandwidth Measurements
1:1
22pF
FB*
120nH03199-C-052
*FERRITE BEAD
0.1µF28Ω
237Ω
28Ω
1.8nF
OSCILLOSCOPEFigure 52. Transient Measurements
1:1
0.1µF
SPECTRUM
ANALYZER
22pF1Ω
49ΩG
*FERRITE BEAD
FB*
120nH
0.1µF03199-C-053
0.1µFFigure 53. Used for Noise Measurements
28Ω03199-C-054
28Ω0.1µF0.1µF
SPECTRUM
ANALYZER
120nHFB*
22pF1:1
1.8nF
237Ω
*FERRITE BEAD Figure 54. Distortion
270Ω
NETWORKANALYZER
22pF
*FERRITEBEAD28Ω
237Ω
50Ω
0.1µF
28Ω50ΩFigure 55. S11 Measurements
