General Description
The MAX2066 high-linearity digital variable-gain amplifier (VGA) is a monolithic SiGe BiCMOS attenuator and
amplifier designed to interface with 50Ω systems operating in the 50MHz to 1000MHz frequency range (See
the
Typical Application Circuit
). The digital attenuator is
controlled as a slave peripheral using either the SPI™compatible interface or a parallel bus with 31dB total
adjustment range in 1dB steps. An added feature
allows “rapid-fire” gain selection between each of four
steps, preprogrammed by the user through the SPIcompatible interface. The 2-pin control allows the user
to quickly access any one of four customized attenuation states without reprogramming the SPI bus.
Because each stage has its own RF input and RF output,
this component can be configured to either optimize NF
(amplifier configured first), or OIP3 (amplifier last). The
device’s performance features include 22dB amplifier
gain (amplifier only), 5.2dB NF at maximum gain (includes
attenuator insertion loss), and a high OIP3 level of
+42.4dBm. Each of these features makes the MAX2066
an ideal VGA for numerous receiver and transmitter
applications.
In addition, the MAX2066 operates from a single +5V
supply with full performance, or a single +3.3V supply
with slightly reduced performance, and has an
adjustable bias to trade current consumption for linearity
performance. This device is available in a compact 40pin thin QFN package (6mm x 6mm) with an exposed
pad. Electrical performance is guaranteed over the
extended temperature range (TC= -40°C to +85°C).
Applications
IF and RF Gain Stages
Cellular Band WCDMA and cdma2000
®
Base
Stations
GSM 850/GSM 900 EDGE Base Stations
WiMAX and LTE Base Stations and Customer
Premise Equipment
Fixed Broadband Wireless Access
Wireless Local Loop
Military Systems
Video-on-Demand (VOD) and DOCSIS
®
-
Compliant EDGE QAM Modulation
Cable Modem Termination Systems (CMTS)
RFID Handheld and Portal Readers
Features
♦ 50MHz to 1000MHz RF Frequency Range
♦ Pin-Compatible Family Includes
MAX2065 (Analog/Digital VGA)
MAX2067 (Analog VGA)
♦ 20.5dB (typ) Maximum Gain
♦ 0.4dB Gain Flatness Over 100MHz Bandwidth
♦ 31dB Gain Range
♦ Supports Four “Rapid-Fire” Preprogrammed
Attenuator States
Quickly Access Any One of Four Customized
Attenuation States Without Reprogramming
the SPI Bus
Ideal for Fast-Attack, High-Level Blocker Protection
Prevents ADC Overdrive Condition
♦ Excellent Linearity (Configured with Amplifier
Last)
+42.4dBm OIP3
+65dBm OIP2
+19dBm Output 1dB Compression Point
-68dBc HD2
-88dBc HD3
♦ 5.2dB Typical Noise Figure (NF)
♦ Fast, 25ns Digital Switching
♦ Very Low Digital VGA Amplitude Overshoot/
Undershoot
♦ Single +5V Supply (Optional +3.3V Operation)
♦ External Current-Setting Resistors Provide Option
for Operating Device in Reduced-Power/
Reduced-Performance Mode
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-4057; Rev 0; 3/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
+
Denotes a lead-free package.
*
EP = Exposed pad.
T = Tape and reel.
cdma2000 is a registered trademark of Telecommunications
Industry Association.
DOCSIS and CableLabs are registered trademarks of Cable
Television Laboratories, Inc. (CableLabs®).
SPI is a trademark of Motorola, Inc.
Pin Configuration appears at end of data sheet.
PART TEMP RANGE
MAX2066ETL+ -40°C to +85°C 40 Thin QFN-EP*
MAX2066ETL+T -40°C to +85°C 40 Thin QFN-EP*
PINPACKAGE
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
+3.3V SUPPLY DC ELECTRICAL CHARACTERISTICS
(
Typical Application Circuit
, high-current (HC) mode, VCC= VDD= +3.0V to +3.6V, TC= -40°C to +85°C. Typical values are at VCC=
V
DD
= +3.3V and TC= +25°C, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: Based on junction temperature TJ= TC+ (θJCx VCCx ICC). This formula can be used when the temperature of the exposed
pad is known while the device is soldered down to a printed-circuit board (PCB). See the
Applications Information
section
for details. The junction temperature must not exceed +150°C.
Note 2: Junction temperature T
J
= TA+ (θJAx VCCx ICC). This formula can be used when the ambient temperature of the PCB is
known. The junction temperature must not exceed +150°C.
Note 3: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer
board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial
.
Note 4: T
C
is the temperature on the exposed pad of the package. TAis the ambient temperature of the device and PCB.
VCC_ to GND ........................................................-0.3V to +5.5V
VDD_LOGIC, DATA, CS, CLK,
SER/PAR..............................................-0.3V to (VCC_ + 0.3V)
STATE_A, STATE_B, D0–D4 ....................-0.3V to (VCC_ + 0.3V)
AMP_IN, AMP_OUT .................................-0.3V to (VCC_ + 0.3V)
ATTEN_IN, ATTEN_OUT........................................-1.2V to +1.2V
RSET to GND.........................................................-0.3V to +1.2V
RF Input Power (ATTEN_IN, ATTEN_OUT).....................+20dBm
RF Input Power (AMP_IN)...............................................+18dBm
Continuous Power Dissipation (Note 1) ...............................6.5W
θ
JA
(Notes 2, 3)..............................................................+38°C/W
θ
JC
(Note 3) ...................................................................+10°C/W
Operating Temperature Range (Note 4).....T
C
= -40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
+5V SUPPLY DC ELECTRICAL CHARACTERISTICS
(
Typical Application Circuit
, VCC= VDD= +4.75V to +5.25V, TC= -40°C to +85°C. Typical values are at VCC= VDD= +5V and
T
C
= +25°C, unless otherwise noted.)
Supply Voltage V
Supply Current I
LOGIC INPUTS (DATA, CS, CLK, SER/PAR, STATE_A, STATE_B, D0–D4)
Input High Voltage V
Input Low Voltage V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CC
CC
(Note 5) 3.0 3.3 3.6 V
IH
IL
58 80 mA
2V
0.8 V
Supply Voltage V
Supply Current I
LOGIC INPUTS (DATA, CS, CLK, SER/PAR, STATE_A, STATE_B, D0–D4)
Input High Voltage V
Input Low Voltage V
Input Current Logic-High I
Input Current Logic-Low I
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CC
CC
IH
IL
Low-current (LC) mode 70 90
High-current (HC) mode 121 144
IH
IL
4.75 5 5.25 V
3V
-1 +1 µA
-1 +1 µA
mA
0.8 V
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
_______________________________________________________________________________________ 3
+5V SUPPLY AC ELECTRICAL CHARACTERISTICS
(
Typical Application Circuit
, VCC= VDD= +4.75 to +5.25V, HC mode with attenuator set for maximum gain, 50MHz ≤ fRF≤ 1000MHz,
T
C
= -40°C to +85°C. Typical values are at VCC= VDD= +5.0V, HC mode, PIN= -20dBm, fRF= 200MHz, and TC= +25°C, unless
otherwise noted.) (Note 6)
+3.3V SUPPLY AC ELECTRICAL CHARACTERISTICS
(
Typical Application Circuit
, VCC= VDD= +3.0V to +3.6V, TC= -40°C to +85°C. Typical values are at VCC= VDD= +3.3V, HC mode
with attenuator set for maximum gain, P
IN
= -20dBm, fRF= 200MHz, and TC= +25°C, unless otherwise noted.) (Note 6)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
RF Frequency Range f
Small-Signal Gain G 20 dB
Output Third-Order Intercept
Point
Noise Figure NF Maximum gain setting 5.6 dB
Total Attenuation Range 31 dB
RF
OIP3 P
(Notes 5, 7) 50 1000 MHz
= 0dBm/tone, maximum gain setting 38 dBm
OUT
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
RF Frequency Range f
Small-Signal Gain G
Gain Variation vs. Temperature -0.004 dB/°C
Gain Flatness vs. Frequency
Noise Figure NF
Total Attenuation Range 31 dB
Output Second-Order Intercept
Point
Output Third-Order Intercept
Point
RF
OIP2 P
OIP3
(Notes 5, 7) 50 1000 MHz
200MHz 20.5
350MHz, TC = +25°C 18.6 19.9 21.1
450MHz 19.5
750MHz 18.1
900MHz 17.4
Any 100MHz frequency band from 50MHz
to 500MHz
200MHz 5.2
350MHz, TC = +25°C (Note 5) 5.5 6.6
450MHz 5.6
750MHz 6.2
900MHz 6.4
= 0dBm/tone, Δf = 1MHz, f1 + f
OUT
P
= 0dBm/tone,
OUT
H C m od e, Δ f = 1M H z
P
= 0dBm/tone,
OUT
LC mode, Δf = 1MHz
200MHz 42.4
350MHz 40.4
450MHz 39.5
750MHz 37.3
900MHz 36.2
200MHz 40
350MHz 38
450MHz 37
750MHz 35
900MHz 33
2
0.4 dB
65 dBm
dB
dB
dBm
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
4 _______________________________________________________________________________________
+5V SUPPLY AC ELECTRICAL CHARACTERISTICS (continued)
(
Typical Application Circuit
, VCC= VDD= +4.75 to +5.25V, HC mode with attenuator set for maximum gain, 50MHz ≤ fRF≤ 1000MHz,
T
C
= -40°C to +85°C. Typical values are at VCC= VDD= +5.0V, HC mode, PIN= -20dBm, fRF= 200MHz, and TC= +25°C, unless
otherwise noted.) (Note 6)
Note 5: Guaranteed by design and characterization.
Note 6: All limits include external component losses. Output measurements are performed at RF output port of the
Typical
Application Circuit
.
Note 7: Operating outside this range is possible, but with degraded performance of some parameters.
Note 8: It is advisable not to continuously operate the VGA RF input above +15dBm.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Output -1dB Compression Point P
Second Harmonic
Third Harmonic
Group Delay Includes EV kit PCB trace delay 0.8 ns
Input Return Loss 50Ω source, maximum gain setting 23 dB
Output Return Loss 50Ω load, maximum gain setting 18 dB
DIGITAL ATTENUATOR
Insertion Loss 2.5 dB
Input Second-Order Intercept
Point
Input Third-Order Intercept Point IIP3 P
Attenuation Range 31.2 dB
Step Size 1dB
Relative Step Accuracy 0.2 dB
Absolute Step Accuracy 0.45 dB
Insertion Phase Step fRF = 170MHz
Amplitude Overshoot/Undershoot
Switching Speed
Input Return Loss 50Ω source, maximum gain setting 19 dB
Output Return Loss 50Ω load, maximum gain setting 19 dB
SERIAL PERIPHERAL INTERFACE (SPI)
Maximum Clock Speed f
Data-to-Clock Setup Time t
Data-to-Clock Hold Time t
Clock-to-CS Setup Time t
CS Positive Pulse Width t
CS Setup Time t
Clock Pulse Width t
1dB
IIP2
CLK
CS
CH
ES
EW
EWS
CW
fRF = 350MHz, TC = +25°C (Note 5, 8) 17 18.7 dBm
P
= +3dBm, fIN = 200MHz, TC = +25°C
OUT
(Note 5)
P
= +3dBm, fIN = 200MHz, TC = +25°C
OUT
(Note 5)
P
= 0dBm, P
RF1
+ f
f
1
2
= 0dBm, P
RF1
Between any two
states
RF settled to within
±0.1dB
= 0dBm, Δf = 1MHz,
RF2
= 0dBm, Δf = 1MHz 41 dBm
RF2
0dB to 16dB 4.8
24dB 8
31dB 10.8
ET = 15ns 1.0
ET = 40ns 0.05
31dB to 0dB 25
0dB to 31dB 21
-60 -68 dBc
-72 -88 dBc
52 dBm
d eg r ees
dB
ns
20 MHz
2ns
2.5 ns
3ns
7ns
3.5 ns
5ns
GAIN vs. RF FREQUENCY
MAX2066 toc03
RF FREQUENCY (MHz)
GAIN (dB)
850450 650250
16
17
18
20
19
21
22
23
15
50 1050
TC = +25°C
TC = -40°C
TC = +85°C
GAIN vs. RF FREQUENCY
MAX2066 toc03
RF FREQUENCY (MHz)
GAIN (dB)
850450 650250
16
17
18
20
19
21
22
23
15
50 1050
VCC = 4.75V, 5.00V, 5.25V
ATTENUATOR RELATIVE
ERROR vs. RF FREQUENCY
MAX2066 toc05
RF FREQUENCY (MHz)
RELATIVE ERROR (dB)
850450 650250
-0.50
0
0.50
1.00
-0.75
-0.25
0.25
0.75
-1.00
50 1050
INPUT MATCH OVER ATTENUATOR
SETTING vs. RF FREQUENCY
MAX2066 toc07
RF FREQUENCY (MHz)
INPUT MATCH (dB)
850450 650250
-30
-20
-10
0
-50
-40
50 1050
0dB
1dB
31dB
4dB
2dB
8dB
16dB
OUTPUT MATCH OVER ATTENUATOR
SETTING vs. RF FREQUENCY
MAX2066 toc08
RF FREQUENCY (MHz)
OUTPUT MATCH (dB)
850450 650250
-15
-10
-5
0
-30
-25
-20
50 1050
0dB, 1dB, 2dB, 4dB
16dB, 31dB
8dB
REVERSE ISOLATION OVER ATTENUATOR
SETTING vs. RF FREQUENCY
MAX2066 toc09
RF FREQUENCY (MHz)
REVERSE ISOLATION (dB)
850450 650250
-50
-40
-30
-70
-60
50 1050
ATTENUATOR 0dB
ATTENUATOR 31dB
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2066 toc01
VCC (V)
SUPPLY CURRENT (mA)
5.1255.0004.875
110
120
130
140
150
100
4.750 5.250
TC = +85°C
TC = +25°C
TC = -40°C
GAIN OVER ATTENUATOR SETTING
vs. RF FREQUENCY
MAX2066 toc04
RF FREQUENCY (MHz)
GAIN (dB)
850450 650250
-15
5
15
25
-25
50 1050
ATTENUATOR ABSOLUTE
ERROR vs. RF FREQUENCY
MAX2066 toc06
RF FREQUENCY (MHz)
ABSOLUTE ERROR (dB)
850450 650250
-0.50
0
0.50
1.00
-0.75
-0.25
0.25
0.75
-2.00
-1.25
-1.50
-1.75
-1.00
50 1050
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
_______________________________________________________________________________________ 5
Typical Operating Characteristics
(VCC= VDD= +5.0V, HC mode, digital attenuator set for maximum gain, PIN= -20dBm, fRF= 200MHz, and TC= +25°C, unless otherwise noted.)
OUTPUT IP3 vs. RF FREQUENCY
MAX2066 toc16
RF FREQUENCY (MHz)
OUTPUT IP3 (dBm)
45
50
55
40
35
30
50 450 850 1050650250
VCC = 4.75V
VCC = 5.25V
VCC = 5.00V
P
OUT
= 0dBm/TONE
OUTPUT IP3 vs. RF FREQUENCY
MAX2066 toc15
RF FREQUENCY (MHz)
OUTPUT IP3 (dBm)
45
50
55
40
35
30
50 450 850 1050650250
TC = -40°C
TC = +85°C
TC = +25°C
P
OUT
= 0dBm/TONE
OUTPUT P1dB vs. RF FREQUENCY
MAX2066 toc14
RF FREQUENCY (MHz)
OUTPUT P1dB (dBm)
19
20
21
18
17
16
15
50 450 850 1050650250
VCC = 4.75V
VCC = 5.25V
VCC = 5.00V
NOISE FIGURE vs. RF FREQUENCY
MAX2066 toc12
RF FREQUENCY (MHz)
NOISE FIGURE (dB)
850 1050650450
7
8
9
6
5
4
3
2
50 250
VCC = 4.75V, 5.00V, 5.25V
ATTENUATOR PHASE CHANGE
BETWEEN STATES vs. RF FREQUENCY
MAX2066 toc10
RF FREQUENCY (MHz)
S21 PHASE CHANGE (DEG)
850450 650250
40
50
60
-10
30
20
10
0
50 1050
POSITIVE PHASE = ELECTRICALLY SHORTER
REFERENCED TO HIGH GAIN STATE
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VCC= VDD= +5.0V, HC mode, digital attenuator set for maximum gain, PIN= -20dBm, fRF= 200MHz, and TC= +25°C, unless otherwise noted.)
NOISE FIGURE vs. RF FREQUENCY
9
OUTPUT P1dB vs. RF FREQUENCY
21
TC = +85°C
20
19
18
TC = -40°C
17
OUTPUT P1dB (dBm)
16
15
50 450 850 1050650250
TC = +25°C
RF FREQUENCY (MHz)
NOISE FIGURE (dB)
MAX2066 toc13
8
TC = +85°C
7
6
5
4
TC = -40°C
3
2
50 1050
RF FREQUENCY (MHz)
TC = +25°C
850450 650250
MAX2066 toc11
OUTPUT IP3 vs. ATTENUATOR STATE
45
44
43
42
OUTPUT IP3 (dBm)
41
TC = -40°C, +25°C, +85°C, LSB, USB
40
0 12202832244168
ATTENUATOR STATE (dB)
P
= 0dBm/TONE
OUT
= 200MHz
f
RF
MAX2066 toc17
2nd HARMONIC (dBc)
2nd HARMONIC vs. RF FREQUENCY
80
70
60
50
40
50 450 850 1050650250
TC = +85°C
TC = -40°C
TC = +25°C
RF FREQUENCY (MHz)
P
= 3dBm
OUT
MAX2066 toc18
OIP2 vs. RF FREQUENCY
MAX2066 toc25
RF FREQUENCY (MHz)
OIP2 (dBm)
250 450 650 850
75
55
70
65
60
40
50
45
50 1050
VCC = 4.75V
VCC = 5.00V
P
OUT
= 0dBm/TONE
VCC = 5.25V
3rd HARMONIC vs. RF FREQUENCY
MAX2066 toc22
RF FREQUENCY (MHz)
3rd HARMONIC (dBc)
250 450 650 850
110
70
100
90
80
60
50 1050
VCC = 4.75V
VCC = 5.00V
VCC = 5.25V
P
OUT
= 3dBm
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
_______________________________________________________________________________________ 7
Typical Operating Characteristics (continued)
(VCC= VDD= +5.0V, HC mode, digital attenuator set for maximum gain, PIN= -20dBm, fRF= 200MHz, and TC= +25°C, unless otherwise noted.)
2nd HARMONIC vs. RF FREQUENCY
80
VCC = 5.25V
70
60
2nd HARMONIC (dBc)
50
40
50 1050
VCC = 4.75V
250 450 650 850
RF FREQUENCY (MHz)
P
= 3dBm
OUT
VCC = 5.00V
71
70
MAX2066 toc19
69
68
67
2nd HARMONIC (dBc)
66
65
100
95
90
85
80
3rd HARMONIC (dBc)
75
2nd HARMONIC vs. ATTENUATOR STATE
P
= 3dBm
OUT
= 200MHz
f
RF
TC = -40°C
TC = +25°C
TC = +85°C
0 8 16 24 3212 20 284
ATTENUATOR STATE (dB)
3rd HARMONIC vs. ATTENUATOR STATE
P
= 3dBm
TC = +85°C
TC = -40°C
OUT
= 200MHz
f
RF
TC = +25°C
MAX2066 toc20
MAX2066 toc23
3rd HARMONIC vs. RF FREQUENCY
110
100
90
80
3rd HARMONIC (dBc)
70
60
TC = -40°C
50 450 850 1050650250
RF FREQUENCY (MHz)
OIP2 vs. RF FREQUENCY
75
70
65
60
55
OIP2 (dBm)
50
45
TC = +25°C
TC = -40°C
P
TC = +85°C
P
= 0dBm/TONE
OUT
TC = +85°C
= 3dBm
OUT
TC = +25°C
MAX2066 toc21
MAX2066 toc24
70
0 8 16 24 324122028
ATTENUATOR STATE (dB)
40
250 450 650 850
50 1050
RF FREQUENCY (MHz)
OIP2 vs. ATTENUATOR STATE
68
TC = -40°C
66
64
OIP2 (dBm)
62
60
58
TC = +25°C
0 8 16 24 324122028
ATTENUATOR STATE (dB)
P
= 0dBm/TONE
OUT
= 200MHz
f
RF
TC = +85°C
MAX2066 toc26
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VCC= VDD= +5.0V, digital attenuator only, maximum gain, PIN= -20dBm and TC= +25°C, unless otherwise noted.)
0
-1
-2
GAIN (dB)
-3
-4
-5
GAIN vs. RF FREQUENCY
(ATTENUATOR ONLY)
TC = -40°C
TC = +85°C
50 450 850 1050650250
RF FREQUENCY (MHz)
TC = +25°C
MAX2066 toc27
GAIN vs. RF FREQUENCY
0
-1
-2
GAIN (dB)
-3
-4
-5
50 1050
(ATTENUATOR ONLY)
VCC = 4.75V, 5.00V, 5.25V
250 450 650 850
RF FREQUENCY (MHz)
MAX2066 toc28
MAX2066
OUTPUT MATCH OVER ATTENUATOR SETTING
vs. RF FREQUENCY (LOW-CURRENT MODE)
RF FREQUENCY (MHz)
OUTPUT MATCH (dB)
1050650250
0
-30
-5
-15
-20
-10
-25
50 450 850
16dB, 31dB
8dB
0dB, 1dB, 2dB, 4dB
MAX2066 toc33
INPUT MATCH OVER ATTENUATOR SETTING
vs. RF FREQUENCY (LOW-CURRENT MODE)
MAX2066 toc32
RF FREQUENCY (MHz)
INPUT MATCH (dB)
850450 650250
-30
-20
-10
0
-50
-40
50 1050
0dB
1dB
31dB
4dB
2dB
8dB
16dB
GAIN vs. RF FREQUENCY
(LOW-CURRENT MODE)
RF FREQUENCY (MHz)
GAIN (dB)
250 450 650 850
23
19
15
22
21
20
16
18
17
50 1050
VCC = 4.75V, 5.00V, 5.25V
MAX2066 toc31
GAIN vs. RF FREQUENCY
(LOW-CURRENT MODE)
RF FREQUENCY (MHz)
GAIN (dB)
23
15
21
19
17
22
20
18
16
50 450 850 1050650250
TC = -40°C
TC = +85°C
TC = +25°C
MAX2066 toc30
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(LOW-CURRENT MODE)
VCC (V)
SUPPLY CURRENT (mA)
4.875 5.000 5.125
85
55
75
65
4.750 5.250
TC = -40°C
TC = +85°C
TC = +25°C
MAX2066 toc29
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
_______________________________________________________________________________________ 9
Typical Operating Characteristics (continued)
(VCC= VDD= +5.0V, LC mode, digital attenuator set for maximum gain, PIN= -20dBm, fRF= 200MHz, and TC= +25°C, unless otherwise noted.)
NOISE FIGURE vs. RF FREQUENCY
(LOW-CURRENT MODE)
MAX2066 toc34
RF FREQUENCY (MHz)
NOISE FIGURE (dB)
850450 650250
4
5
6
8
7
9
10
11
3
2
50 1050
TC = +25°C
TC = -40°C
TC = +85°C
NOISE FIGURE vs. RF FREQUENCY
(LOW-CURRENT MODE)
MAX2066 toc35
RF FREQUENCY (MHz)
NOISE FIGURE (dB)
850450 650250
2
3
4
6
5
7
8
9
1
50 1050
VCC = 4.75V, 5.00V, 5.25V
OUTPUT P1dB vs. RF FREQUENCY
(LOW-CURRENT MODE)
MAX2066 toc36
RF FREQUENCY (MHz)
OUTPUT P1dB (dBm)
850450 650250
16
17
18
15
14
13
50 1050
TC = +25°C
TC = -40°C
TC = +85°C
OUTPUT P1dB vs. RF FREQUENCY
(LOW-CURRENT MODE)
MAX2066 toc37
RF FREQUENCY (MHz)
OUTPUT P1dB (dBm)
850450 650250
16
17
18
15
14
13
50 1050
VCC = 5.00V
VCC = 5.25V
VCC = 4.75V
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
10 ______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VCC= VDD= +5.0V, LC mode, digital attenuator set for maximum gain, PIN= -20dBm, fRF= 200MHz, and TC= +25°C, unless otherwise noted.)
OUTPUT IP3 vs. RF FREQUENCY
(LOW-CURRENT MODE)
45
TC = +25°C
40
35
OUTPUT IP3 (dBm)
30
TC = +85°C
P
= 0dBm/TONE
OUT
TC = -40°C
MAX2066 toc38
OUTPUT IP3 vs. RF FREQUENCY
45
40
35
OUTPUT IP3 (dBm)
30
(LOW-CURRENT MODE)
P
= 0dBm/TONE
OUT
VCC = 5.00V
VCC = 5.25V
VCC = 4.75V
MAX2066 toc39
OUTPUT IP3 vs. ATTENUATOR STATE
(LOW-CURRENT MODE)
45
43
TC = -40°C LSB TC = -40°C USB
41
39
OUTPUT IP3 (dBm)
TC = +85°C USB
37
TC = +85°C LSB
P
= 0dBm/TONE
OUT
= 200MHz
f
RF
TC = +25°C LSB
TC = +25°C USB
MAX2066 toc40
25
50 450 850
RF FREQUENCY (MHz)
2nd HARMONIC vs. RF FREQUENCY
(LOW-CURRENT MODE)
80
70
60
2nd HARMONIC (dBc)
50
40
50 450 850
TC = +25°C
RF FREQUENCY (MHz)
3rd HARMONIC vs. RF FREQUENCY
(LOW-CURRENT MODE)
110
100
90
80
3rd HARMONIC (dBc)
70
TC = +85°C
60
250 450 650 850 1050
50
RF FREQUENCY (MHz)
TC = +85°C
TC = +25°C
P
= 3dBm
OUT
TC = -40°C
P
= 3dBm
OUT
TC = -40°C
1050650250
MAX2066 toc41
1050650250
MAX2066 toc44
25
50 450 850
RF FREQUENCY (MHz)
2nd HARMONIC vs. RF FREQUENCY
(LOW-CURRENT MODE)
80
70
VCC = 5.00V
60
2nd HARMONIC (dBc)
50
40
50 450 850
VCC = 4.75V
RF FREQUENCY (MHz)
3rd HARMONIC vs. RF FREQUENCY
(LOW-CURRENT MODE)
110
100
90
80
3rd HARMONIC (dBc)
70
60
50 450 850
VCC = 5.00V
VCC = 4.75V
RF FREQUENCY (MHz)
P
OUT
VCC = 5.25V
P
OUT
VCC = 5.25V
= 3dBm
= 3dBm
1050650250
1050650250
1050650250
MAX2066 toc42
2nd HARMONIC (dBc)
MAX2066 toc45
3rd HARMONIC (dBc)
35
0 12202832244168
ATTENUATOR STATE (dB)
2nd HARMONIC vs. ATTENUATOR STATE
(LOW-CURRENT MODE)
73
72
71
70
69
68
67
0 12202832244168
TC = +25°C
TC = -40°C
ATTENUATOR STATE (dB)
TC = +85°C
P
OUT
= 200MHz
f
RF
= 3dBm
3rd HARMONIC vs. ATTENUATOR STATE
(LOW-CURRENT MODE)
90
TC = +25°C
85
80
75
08 2816 2420412
TC = -40°C
ATTENUATOR STATE (dB)
P
f
RF
TC = +85°C
OUT
= 200MHz
MAX2066 toc43
= 3dBm
MAX2066 toc46
32
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
______________________________________________________________________________________ 11
Typical Operating Characteristics (continued)
(VCC= VDD= +5.0V, LC mode, digital attenuator set for maximum gain, PIN= -20dBm, fRF= 200MHz, and TC= +25°C, unless otherwise noted.)
OIP2 vs. RF FREQUENCY
(LOW-CURRENT MODE)
RF FREQUENCY (MHz)
OIP2 (dBm)
1050650250
75
40
70
65
60
55
50
45
50 450 850
MAX2066 toc47
TC = -40°C
P
OUT
= 0dBm/TONE
TC = +85°C
TC = +25°C
OIP2 vs. RF FREQUENCY
(LOW-CURRENT MODE)
RF FREQUENCY (MHz)
OIP2 (dBm)
1050650250
75
40
70
65
60
55
50
45
50 450 850
MAX2066 toc48
P
OUT
= 0dBm/TONE
VCC = 5.00V
VCC = 4.75V
VCC = 5.25V
OIP2 vs. ATTENUATOR STATE
(LOW-CURRENT MODE)
MAX2066 toc49
ATTENUATOR STATE (dB)
OIP2 (dBm)
66
68
70
64
62
60
0 12202832244168
P
OUT
= 0dBm/TONE
f
RF
= 200MHz
TC = +25°C
TC = -40°C
TC = +85°C
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
12 ______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VCC= VDD= +3.3V, HC mode, digital attenuator set for maximum gain, PIN= -20dBm, fRF= 200MHz, and TC= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
80
70
60
SUPPLY CURRENT (mA)
50
40
TC = -40°C
3.00
INPUT MATCH OVER ATTENUATOR
SETTING vs. RF FREQUENCY
0
-10
-20
-30
INPUT MATCH (dB)
-40
-50
50 1050
31dB
16dB
4dB
RF FREQUENCY (MHz)
TC = +25°C
TC = +85°C
VCC (V)
1dB
0dB
2dB
VCC = 3.3V
8dB
850450 650250
MAX2066 toc50
3.603.453.303.15
MAX2066 toc53
23
22
21
20
19
GAIN (dB)
18
17
16
15
TC = +25°C
TC = +85°C
50 450 850
RF FREQUENCY (MHz)
OUTPUT MATCH OVER ATTENUATOR
SETTING vs. RF FREQUENCY
0
-5
GAIN vs. RF FREQUENCY
-10
-15
-20
OUTPUT MATCH (dB)
-25
-30
50
250 450 650 850 1050
0dB, 1dB, 2dB, 4dB
16dB, 31dB
RF FREQUENCY (MHz)
TC = -40°C
VCC = 3.3V
VCC = 3.3V
8dB
1050650250
MAX2066 toc51
GAIN (dB)
MAX2066 toc54
NOISE FIGURE (dB)
23
22
21
20
19
18
17
16
15
VCC = 3.6V
VCC = 3.3V
VCC = 3.0V
50 450 850
RF FREQUENCY (MHz)
NOISE FIGURE vs. RF FREQUENCY
9
TC = +85°C
8
7
6
5
GAIN vs. RF FREQUENCY
4
3
2
TC = -40°C
250 450 650 850 1050
50
RF FREQUENCY (MHz)
MAX2066 toc52
1050650250
VCC = 3.3V
MAX2066 toc55
TC = +25°C
NOISE FIGURE vs. RF FREQUENCY
9
8
7
6
5
NOISE FIGURE (dB)
4
3
2
VCC = 3.0V
250 450 650 850
50 1050
RF FREQUENCY (MHz)
VCC = 3.3V
VCC = 3.6V
MAX2066 toc56
OUTPUT P1dB (dBm)
OUTPUT P1dB vs. RF FREQUENCY
17
16
15
14
13
12
11
10
TC = -40°C
TC = +85°C
9
50
250 450 650 850 1050
TC = +25°C
RF FREQUENCY (MHz)
VCC = 3.3V
MAX2066 toc57
OUTPUT P1dB vs. RF FREQUENCY
17
16
15
14
13
12
OUTPUT P1dB (dBm)
11
10
VCC = 3.3V
VCC = 3.0V
9
50
250 450 650 850 1050
RF FREQUENCY (MHz)
VCC = 3.6V
MAX2066 toc58
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
______________________________________________________________________________________ 13
Typical Operating Characteristics (continued)
(VCC= VDD= +3.3V, HC mode, digital attenuator set for maximum gain, PIN= -20dBm, fRF= 200MHz, and TC= +25°C, unless otherwise noted.)
OUTPUT IP3 vs. RF FREQUENCY
50
45
40
35
OUTPUT IP3 (dBm)
30
25
20
50
TC = +25°C
250 450 650 850 1050
RF FREQUENCY (MHz)
2nd HARMONIC vs. RF FREQUENCY
80
TC = +25°C
70
60
50
2nd HARMONIC (dBc)
40
TC = +85°C
TC = -40°C
VCC = 3.3V
= 0dBm/TONE
P
OUT
TC = -40°C
TC = +85°C
P
VCC = 3.3V
= 3dBm
OUT
MAX2066 toc59
OUTPUT IP3 (dBm)
MAX2066 toc62
2nd HARMONIC (dBc)
OUTPUT IP3 vs. RF FREQUENCY
50
45
40
35
30
25
20
VCC = 3.0V
50 450 850
RF FREQUENCY (MHz)
VCC = 3.3V
P
OUT
2nd HARMONIC vs. RF FREQUENCY
80
70
60
50
40
VCC = 3.3V
VCC = 3.0V
= 0dBm/TONE
VCC = 3.6V
P
= 3dBm
OUT
VCC = 3.6V
MAX2066 toc60
1050650250
MAX2066 toc63
OUTPUT IP3 vs. ATTENUATOR STATE
40
TC = +25°C USB
39
38
37
OUTPUT IP3 (dBm)
36
35
34
TC = +25°C LSB
TC = +85°C LSB
TC = +85°C USB
0 12202832244168
P
OUT
TC = -40°C LSB
ATTENUATOR STATE (dB)
2nd HARMONIC vs. ATTENUATOR STATE
70
TC = +85°C
65
60
2nd HARMONIC (dBc)
55
TC = +25°C
TC = -40°C
VCC = 3.3V
= 200MHz
f
RF
= 0dBm/TONE
TC = -40°C USB
VCC = 3.3V
= 200MHz
f
RF
= 3dBm
P
OUT
MAX2066 toc61
MAX2066 toc64
30
250 450 650 850 1050
50
RF FREQUENCY (MHz)
3rd HARMONIC vs. RF FREQUENCY
110
100
90
80
70
3rd HARMONIC (dBc)
60
50
50 450 850
TC = +25°C
RF FREQUENCY (MHz)
30
P
TC = -40°C
50
250 450 650 850 1050
RF FREQUENCY (MHz)
VCC = 3.3V
= 3dBm
OUT
TC = +85°C
MAX2066 toc65
1050650250
50
3rd HARMONIC vs. RF FREQUENCY
110
100
90
VCC = 3.3V
80
70
3rd HARMONIC (dBc)
60
50
VCC = 3.0V
250 450 650 850 1050
50
RF FREQUENCY (MHz)
4 8 12 2016 24 28 32
0
ATTENUATOR STATE (dB)
P
= 3dBm
OUT
MAX2066 toc66
VCC = 3.6V
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
14 ______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VCC= VDD= +3.3V, HC mode, digital attenuator set for maximum gain, PIN= -20dBm, fRF= 200MHz, and TC= +25°C, unless otherwise noted.)
3rd HARMONIC vs. ATTENUATOR STATE
85
80
75
3rd HARMONIC (dBc)
70
0 8 16 24 2841220
70
60
50
OIP2 (dBm)
40
30
50 450 850
TC = +25°C
TC = +85°C
TC = -40°C
ATTENUATOR STATE (dB)
OIP2 vs. RF FREQUENCY
VCC = 3.3V
VCC = 3.0V
RF FREQUENCY (MHz)
f
P
P
= 0dBm/TONE
OUT
VCC = 3.6V
VCC = 3.3V
= 200MHz
RF
= 3dBm
OUT
32
1050650250
MAX2066 toc67
MAX2066 toc69
70
TC = +85°C
60
50
OIP2 (dBm)
40
30
TC = -40°C
50 450 850
RF FREQUENCY (MHz)
OIP2 vs. ATTENUATOR STATE
70
TC = +85°C
60
50
OIP2 (dBm)
TC = -40°C
40
30
0
ATTENUATOR STATE (dB)
OIP2 vs. RF FREQUENCY
P
TC = +25°C
P
OUT
TC = +25°C
VCC = 3.3V
= 0dBm/TONE
OUT
VCC = 3.3V
= 200MHz
f
RF
= 0dBm/TONE
MAX2068 toc68
1050650250
MAX2066 toc70
322416 20 281248
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
______________________________________________________________________________________ 15
Pin Description
PIN NAME DESCRIPTION
1, 16, 19, 22,
24–28, 30,
31, 33–36
2, 3, 32,
37–40
4 DATA SPI Data Digital Input
5 CLK SPI Clock Digital Input
6 CS SPI Chip-Select Digital Input
7 VDD_LOGIC
8 SER/PAR
9 STATE_A Digital Attenuator Preprogrammed Attenuation State Logic Input
10 STATE_B
11 D4 16dB Attenuator Logic Input. Logic 0 = disable, Logic 1 = enable.
12 D3 8dB Attenuator Logic Input. Logic 0 = disable, Logic 1 = enable.
13 D2 4dB Attenuator Logic Input. Logic 0 = disable, Logic 1 = enable.
14 D1 2dB Attenuator Logic Input. Logic 0 = disable, Logic 1 = enable.
15 D0 1dB Attenuator Logic Input. Logic 0 = disable, Logic 1 = enable.
17 AMP_OUT Driver Amplifier Output (50Ω). See the Typical Application Circuit for details.
18 RSET Driver Amplifier Bias Setting. See the External Bias section.
20 AMP_IN Driver Amplifier Input (50Ω). See the Typical Application Circuit for details.
21 VC C _AMP
23 ATTEN_OUT
29 ATTEN_IN
—EP
GND Ground
GND Ground. See the Pin-Compatibility Considerations section.
Digital Logic Supply Input. Connect to the digital logic power supply, V
10nF capacitor as close as possible to the pin.
Digital Attenuator SPI or Parallel Control Selection Logic Input. Logic 0 = parallel control,
Logic 1 = serial control.
State A State B Digital Attenuator
Logic = 0 Logic = 0 Preprogrammed State 1
Logic = 1 Logic = 0 Preprogrammed State 2
Logic = 0 Logic = 1 Preprogrammed State 3
Logic = 1 Logic = 1 Preprogrammed State 4
Driver Amplifier Supply Voltage Input. Connect to the V
1000pF and 10nF capacitors as close as possible to the pin with the smaller value capacitor
closer to the part.
5-Bit Digital Attenuator Output (50Ω). Internally matched to 50Ω. Requires an external DC
blocking capacitor.
5-Bit Digital Attenuator Input (50Ω). Internally matched to 50Ω. Requires an external DC blocking
capacitor.
E xp osed P ad . Inter nal l y connected to GN D . C onnect E P to GN D for p r op er RF p er for m ance and
enhanced ther m al d i ssi p ati on.
CC
power supply. Bypass to GND with
. Bypass to GND with a
DD
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
16 ______________________________________________________________________________________
Detailed Description
The MAX2066 high-linearity digital variable-gain amplifier is a general-purpose, high-performance amplifier
designed to interface with 50Ω systems operating in the
50MHz to 1000MHz frequency range.
The MAX2066 integrates a digital attenuator to provide
31dB of gain control, as well as a driver amplifier optimized to provide high gain, high IP3, low noise figure,
and low power consumption. For applications that do
not require high linearity, the bias current of the amplifier can be adjusted by an external resistor to further
reduce power consumption.
The attenuator is controlled as a slave peripheral using
either the SPI-compatible interface or a parallel bus
with 31dB total adjustment range in 1dB steps. An
added feature allows “rapid-fire” gain selection
between each of the four unique steps (preprogrammed by the user through the SPI-compatible interface). The 2-pin control allows the user to quickly
access any one of four customized attenuation states
without reprogramming the SPI bus. Because each
stage has its own external RF input and RF output, this
component can be configured to either optimize NF
(amplifier configured first), or OIP3 (amplifier last). The
device’s performance features include 22dB standalone amplifier gain (amplifier only), 5.2dB NF at maximum gain (includes attenuator insertion loss), and a
high OIP3 level of +42.4dBm. Each of these features
makes the MAX2066 an ideal VGA for numerous receiver and transmitter applications.
In addition, the MAX2066 operates from a single +5V
supply, or a single +3.3V supply with slightly reduced
performance, and has adjustable bias to trade current
consumption for linearity performance.
5-Bit Digital Attenuator Control
The MAX2066 integrates a 5-bit digital attenuator to
achieve a high level of dynamic range. The digital
attenuator has a 31dB control range, a 1dB step size,
and is programmed either through a dedicated 5-bit
parallel bus or through the 3-wire SPI. See the
Applications Information
section and Table 1 for attenuator programming details. The attenuator can be used
for both static and dynamic power control.
Driver Amplifier
The MAX2066 includes a high-performance driver with
a fixed gain of 22dB. The driver amplifier circuit is optimized for high linearity for the 50MHz to 1000MHz frequency range.
Applications Information
SPI Interface and Attenuator Settings
The attenuator can be programmed through the 3-wire
SPI/MICROWIRE™-compatible serial interface using
5-bit words. Twenty-eight bits of data are shifted in MSB
first and framed by CS. When CS is low, the clock is
active and data is shifted on the rising edge of the
clock. When CS transitions high, the data is latched
and the attenuator setting changes (Figure 1). See
Table 2 for details on the SPI data format.
Table 1. Control Logic
MICROWIRE is a trademark of National Semiconductor Corp.
SER/PAR ATTENUATOR
0 Parallel controlled
1 SPI controlled
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
______________________________________________________________________________________ 17
Figure 1. SPI Timing Diagram
Table 2. SPI Data Format
MSB LSB
t
DN
EWS
DATA
CLOCK
CS
FUNCTION BIT DESCRIPTION
D27 (MSB) 16dB step (MSB of the 5-bit word used to program the digital attenuator state 4)
D26 8dB step
Digital Attenuator State 4
Digital Attenuator State 3
Digital Attenuator State 2
Digital Attenuator State 1
D25 4dB step
D24 2dB step
D23 1dB step (LSB)
D22
D21
D20
D19
D18
D17
D16
D15
D14
D13
D12
D11
D10
D9
D8
D(N - 1) D1 D0
t
t
CS
5-bit word used to program the digital attenuator state 3 (see the description for digital
attenuator state 4)
5-bit word used to program the digital attenuator state 2 (see the description for digital
attenuator state 4)
5-bit word used to program the digital attenuator state 1 (see the description for digital
attenuator state 4)
t
CH
CW
t
ES
t
EW
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
18 ______________________________________________________________________________________
Table 2. SPI Data Format (continued)
Digital Attenuator Settings
Using the Parallel Control Bus
To capitalize on its fast 25ns switching capability, the
MAX2066 offers a supplemental 5-bit parallel control
interface. The digital logic attenuator-control pins
(D0–D4) enable the attenuator stages (Table 3).
Direct access to this 5-bit bus enables the user to avoid
any programming delays associated with the SPI
interface. One of the limitations of any SPI bus is the
speed at which commands can be clocked into each
peripheral device. By offering direct access to the 5-bit
parallel interface, the user can quickly shift between
digital attenuator states as needed for critical “fastattack” automatic gain-control (AGC) applications.
“Rapid-Fire” Preprogrammed
Attenuation States
The MAX2066 has an added feature that provides
“rapid-fire” gain selection between four prepro-
grammed attenuation steps. As with the supplemental
5-bit bus mentioned above, this “rapid-fire” gain selection allows the user to quickly access any one of four
customized digital attenuation states without incurring
the delays associated with reprogramming the device
through the SPI bus.
The switching speed is comparable to that achieved
using the supplemental 5-bit parallel bus. However, by
employing this specific feature, the digital attenuator
I/O is further reduced by a factor of either 5 or 2.5 (5
control bits vs. 1 or 2, respectively) depending on the
number of states desired.
The user can employ the STATE_A and STATE_B logicinput pins to apply each step as required (Table 4).
Toggling just the STATE_A pin (one control bit) yields
two preprogrammed attenuation states; toggling both
the STATE_A and STATE_B pins together (two control
bits) yields four preprogrammed attenuation states.
Table 3. Digital Attenuator Settings (Parallel Control)
FUNCTION BIT DESCRIPTION
D7
D6
D5
Reserved
D4
D3
D2
D1
D0 (LSB)
Bits D[7:0] are reserved. Set to logic 0.
INPUT LOGIC = 0 (OR GROUND) LOGIC = 1
D0 Disable 1dB attenuator, or when SPI is default programmer Enable 1dB attenuator
D1 Disable 2dB attenuator, or when SPI is default programmer Enable 2dB attenuator
D2 Disable 4dB attenuator, or when SPI is default programmer Enable 4dB attenuator
D3 Disable 8dB attenuator, or when SPI is default programmer Enable 8dB attenuator
D4 Disable 16dB attenuator, or when SPI is default programmer Enable 16dB attenuator
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
______________________________________________________________________________________ 19
As an example, assume that the AGC application
requires a static attenuation adjustment to trim out gain
inconsistencies within a receiver lineup. The same AGC
circuit can also be called upon to dynamically attenuate
an unwanted blocker signal that could de-sense the
receiver and lead to an ADC overdrive condition. In this
example, the MAX2066 would be preprogrammed
(through the SPI bus) with two customized attenuation
states—one to address the static gain trim adjustment,
the second to counter the unwanted blocker condition.
Toggling just the STATE_A control bit enables the user
to switch quickly between the static and dynamic attenuation settings with only one I/O pin.
If desired, the user can also program two additional
attenuation states by using the STATE_B control bit as
a second I/O pin. These two additional attenuation settings are useful for software-defined radio applications
where multiple static gain settings may be needed to
account for different frequencies of operation, or where
multiple dynamic attenuation settings are needed to
account for different blocker levels (as defined by multiple wireless standards).
External Bias
Bias currents for the driver amplifier are set and optimized through external resistors. Resistors R1 and R1A
connected to RSET (pin 18) set the bias current for the
amplifier. The external biasing resistor values can be
increased for reduced current operation at the expense
of performance. See Tables 6 and 7 for details.
+5V and +3.3V Supply Voltage
The MAX2066 features an optional +3.3V supply voltage
operation with slightly reduced linearity performance.
Pin-Compatibility Considerations
The MAX2066 is a simplified version of the MAX2065
analog/digital VGA. The MAX2066 does not contain an
analog attenuator, on-chip DAC, or internal reference.
The associated input/output pins are internally connected
to ground (Table 5). Ground the unused input/output pins
to optimize isolation. (See the
Typical Application Circuit
.)
Layout Considerations
The pin configuration of the MAX2066 has been optimized to facilitate a very compact physical layout of the
device and its associated discrete components.
The exposed paddle (EP) of the MAX2066’s 40-pin thin
QFN-EP package provides a low thermal-resistance
path to the die. It is important that the PCB on which the
MAX2066 is mounted be designed to conduct heat
from the EP. In addition, provide the EP with a lowinductance path to electrical ground. The EP must be
soldered to a ground plane on the PCB, either directly
or through an array of plated via holes.
Table 4. Preprogrammed Attenuation
State Settings
Table 5. MAX2065/MAX2066 Pin
Comparison
STATE_A STATE_B DIGITAL ATTENUATOR
0 0 Preprogrammed attenuation state 1
1 0 Preprogrammed attenuation state 2
0 1 Preprogrammed attenuation state 3
1 1 Preprogrammed attenuation state 4
PIN MAX2065 MAX2066
2 VREF_SELECT GND
3 VDAC_EN GND
32 ATTEN1_OUT GND
37 ATTEN1_IN GND
38 VCC_ANALOG GND
39 ANALOG_VCTRL GND
40 VREF_IN GND
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
20 ______________________________________________________________________________________
Figure 2. Bandpass Filter to Reduce Amplitude Overshoot
Table 7. Typical Application Circuit Component Values (LC Mode)
Table 6. Typical Application Circuit Component Values (HC Mode)
Amplitude Overshoot Reduction
To reduce amplitude overshoot during digital attenuator state change, connect a bandpass filter (parallel
LC type) from ATTEN_OUT (pin 23) to ground. L =
18nH and C = 47pF are recommended for 169MHz
operation (Figure 2). Contact the factory for recommended components for other operating frequencies.
DESIGNATION VALUE SIZE VENDOR DESCRIPTION
C1, C2, C7 10nF 0402 Murata Mfg. Co., Ltd. X7R
C3, C4, C6, C8, C9 1000pF 0402 Murata Mfg. Co., Ltd. C0G ceramic capacitors
L1 470nH 1008 Coilcraft, Inc. 1008CS-471XJLC
R1, R1A 10Ω 0402 Vishay 1%
R2 (+3.3V applications only) 1kΩ 0402 Panasonic Corp. 1%
R3 (+3.3V applications only) 2kΩ 0402 Panasonic Corp. 1%
U1 —
40-pin thin QFN-EP
(6mm x 6mm)
DESIGNATION VALUE SIZE VENDOR DESCRIPTION
C1, C2, C7 10nF 0402 Murata Mfg. Co., Ltd. X7R
C3, C4, C6, C8, C9 1000pF 0402 Murata Mfg. Co., Ltd. C0G ceramic capacitors
L1 470nH 1008 Coilcraft, Inc. 1008CS-471XJLC
R1 24Ω 0402 Vishay 1%
R1A 0.01µF 0402 Murata Mfg. Co., Ltd. X7R
R2 (+3.3V applications only) 1kΩ 0402 Panasonic Corp. 1%
R3 (+3.3V applications only) 2kΩ 0402 Panasonic Corp. 1%
U1 —
40-pin thin QFN-EP
(6mm x 6mm)
Maxim Integrated
Products, Inc.
Maxim Integrated
Products, Inc.
MAX2066ETL+
MAX2066ETL+
26
25
24
23
22
21
GND
GND
GND
ATTEN_OUT
GND
VCC_AMP
C6 C7
C8
V
CC
CL
MAX2066
38
D2
13
D0
15
36
GND
D1
14
37
GND GND
16
35
AMP_OUT GND
17
34
GND
33
RSET
18
32
GND
19
AMP_IN GND
20
31
D3
12
39
D4
11
40
238
SER/PAR ATTEN_OUT
6
CS GND
25
247
VDD_LOGIC GND
5
CLK GND
26
4
DATA
GND
27
3
GND
28
2
ATTEN_IN
29
229
STATE_A GND
2110
STATE_B VCC_AMP
*IN LC MODE, R1A IS A 0.01μF CAPACITOR. SEE TABLE 7 FOR DETAILS.
130
GND
GND
+
EP
DRIVER AMP
SPI INTERFACE
DIGITAL
ATTENUATOR
GND
GND
GND
GND
GND
GND
GND
C1
C4
RF OUTPUT
L1
C3
V
DD
C2
V
CC
C7C6
V
CC
R1
R1A*
R2
R3
C9
C8
RF INPUT
MAX2066
Typical Application Circuit
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
______________________________________________________________________________________ 21
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
22 ______________________________________________________________________________________
Pin Configuration/Functional Block Diagram
Chip Information
PROCESS: SiGe BiCMOS
TOP VIEW
GND
+
40
GND
1
2
3
DATA
4
CLK GND
5
CS GND
6
VDD_LOGIC GND
SER/PAR ATTEN_OUT
STATE_A GND
STATE_B VCC_AMP
11
D4 GND
38
39
SPI INTERFACE
13
12
D2
D3 GND
GND
36
37
35
34
MAX2066
15
14
D1 GND
EXPOSED PAD ON BOTTOM.
CONNECT EP TO GND.
D0
TQFN
16
17
GND GND
GND
GND
33
DRIVER AMP
18
RSET
AMP_OUT
32
19
GND
DIGITAL
GND
31
GND
30
ATTEN_INGND
29
GNDGND
28
GND
27
26
ATTENUATOR
25
247
238
229
2110
20
AMP_IN GND
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________
23
© 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
Package Information
For the latest package outline information, go to
www.maxim-ic.com/packages
.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
40 Thin QFN-EP T4066-3
21-0141
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