MAXIM MAX2066ETL

19-4057; Rev 0; 3/08
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
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
Ordering Information
TEMP RANGE
PINPACKAGE
MAX2066ETL+
-40°C to +85°C
40 Thin QFN-EP*
MAX2066ETL+T
-40°C to +85°C
40 Thin QFN-EP*
PART
+Denotes a lead-free package.
*EP = Exposed pad.
T = Tape and reel.
Pin Configuration appears at end of data sheet.
cdma2000 is a registered trademark of Telecommunications
Industry Association.
SPI is a trademark of Motorola, Inc.
DOCSIS and CableLabs are registered trademarks of Cable
Television Laboratories, Inc. (CableLabs®).
________________________________________________________________ Maxim Integrated Products
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.
1
MAX2066
General Description
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
ABSOLUTE MAXIMUM RATINGS
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
θJA (Notes 2, 3)..............................................................+38°C/W
θJC (Note 3) ...................................................................+10°C/W
Operating Temperature Range (Note 4) .....TC = -40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: Based on junction temperature TJ = TC + (θJC x VCC x 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 TJ = TA + (θJA x VCC x 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: TC is the temperature on the exposed pad of the package. TA is the ambient temperature of the device and PCB.
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.
+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 =
VDD = +3.3V and TC = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
Supply Voltage
VCC
Supply Current
ICC
CONDITIONS
(Note 5)
MIN
TYP
MAX
UNITS
3.0
3.3
3.6
V
58
80
mA
LOGIC INPUTS (DATA, CS, CLK, SER/PAR, STATE_A, STATE_B, D0–D4)
Input High Voltage
VIH
2
V
Input Low Voltage
VIL
0.8
V
+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
TC = +25°C, unless otherwise noted.)
PARAMETER
Supply Voltage
Supply Current
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
4.75
5
5.25
V
Low-current (LC) mode
70
90
High-current (HC) mode
121
144
VCC
ICC
mA
LOGIC INPUTS (DATA, CS, CLK, SER/PAR, STATE_A, STATE_B, D0–D4)
Input High Voltage
VIH
Input Low Voltage
VIL
0.8
V
Input Current Logic-High
IIH
-1
+1
µA
Input Current Logic-Low
IIL
-1
+1
µA
2
3
_______________________________________________________________________________________
V
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
(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, PIN = -20dBm, fRF = 200MHz, and TC = +25°C, unless otherwise noted.) (Note 6)
PARAMETER
SYMBOL
RF Frequency Range
fRF
Small-Signal Gain
G
Output Third-Order Intercept
Point
Noise Figure
OIP3
NF
CONDITIONS
(Notes 5, 7)
MIN
TYP
50
MAX
UNITS
1000
MHz
20
dB
POUT = 0dBm/tone, maximum gain setting
38
dBm
Maximum gain setting
5.6
dB
31
dB
Total Attenuation Range
+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,
TC = -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)
PARAMETER
RF Frequency Range
SYMBOL
fRF
CONDITIONS
(Notes 5, 7)
MIN
50
200MHz
G
18.6
Noise Figure
NF
19.5
750MHz
18.1
900MHz
17.4
OIP2
OIP3
1000
MHz
21.1
dB
-0.004
dB/°C
0.4
dB
200MHz
5.2
350MHz, TC = +25°C (Note 5)
5.5
450MHz
5.6
750MHz
6.2
900MHz
6.4
POUT = 0dBm/tone, Δf = 1MHz, f1 + f2
6.6
dB
31
dB
65
dBm
200MHz
42.4
350MHz
40.4
450MHz
39.5
750MHz
37.3
900MHz
36.2
200MHz
40
350MHz
POUT = 0dBm/tone,
450MHz
LC mode, Δf = 1MHz
750MHz
38
900MHz
33
POUT = 0dBm/tone,
HC mode, Δf = 1MHz
Output Third-Order Intercept
Point
UNITS
Any 100MHz frequency band from 50MHz
to 500MHz
Total Attenuation Range
Output Second-Order Intercept
Point
19.9
450MHz
Gain Variation vs. Temperature
Gain Flatness vs. Frequency
MAX
20.5
350MHz, TC = +25°C
Small-Signal Gain
TYP
dBm
37
35
_______________________________________________________________________________________
3
MAX2066
+3.3V SUPPLY AC ELECTRICAL CHARACTERISTICS
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
+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,
TC = -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)
PARAMETER
MIN
TYP
fRF = 350MHz, TC = +25°C (Note 5, 8)
17
18.7
dBm
Second Harmonic
POUT = +3dBm, fIN = 200MHz, TC = +25°C
(Note 5)
-60
-68
dBc
Third Harmonic
POUT = +3dBm, fIN = 200MHz, TC = +25°C
(Note 5)
-72
-88
dBc
Output -1dB Compression Point
SYMBOL
P1dB
CONDITIONS
MAX
UNITS
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
2.5
dB
52
dBm
DIGITAL ATTENUATOR
Insertion Loss
Input Second-Order Intercept
Point
IIP2
PRF1 = 0dBm, PRF2 = 0dBm, Δf = 1MHz,
f1 + f2
Input Third-Order Intercept Point
IIP3
PRF1 = 0dBm, PRF2 = 0dBm, Δf = 1MHz
Attenuation Range
Step Size
41
dBm
31.2
dB
1
dB
Relative Step Accuracy
0.2
dB
Absolute Step Accuracy
0.45
dB
0dB to 16dB
Insertion Phase Step
fRF = 170MHz
4.8
24dB
8
31dB
10.8
degrees
Amplitude Overshoot/Undershoot
Between any two
states
ET = 15ns
1.0
ET = 40ns
0.05
Switching Speed
RF settled to within
±0.1dB
31dB to 0dB
25
0dB to 31dB
21
Input Return Loss
50Ω source, maximum gain setting
19
dB
Output Return Loss
50Ω load, maximum gain setting
19
dB
20
MHz
ns
dB
ns
SERIAL PERIPHERAL INTERFACE (SPI)
Maximum Clock Speed
fCLK
Data-to-Clock Setup Time
tCS
2
Data-to-Clock Hold Time
tCH
2.5
ns
Clock-to-CS Setup Time
tES
3
ns
ns
CS Positive Pulse Width
tEW
7
CS Setup Time
tEWS
3.5
ns
Clock Pulse Width
tCW
5
ns
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.
4
_______________________________________________________________________________________
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
22
20
19
18
TC = +85°C
5.000
5.125
17
16
16
15
50
250
450
650
850
50
1050
250
450
650
850
VCC (V)
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
GAIN OVER ATTENUATOR SETTING
vs. RF FREQUENCY
ATTENUATOR RELATIVE
ERROR vs. RF FREQUENCY
ATTENUATOR ABSOLUTE
ERROR vs. RF FREQUENCY
5
0.50
0.25
0
-0.25
-0.50
450
650
850
50
1050
-0.25
-0.50
-0.75
-1.00
-1.25
-1.75
-2.00
-1.00
250
0.25
0
-1.50
-0.75
-25
MAX2066 toc06
0.50
ABSOLUTE ERROR (dB)
RELATIVE ERROR (dB)
0.75
1050
1.00
0.75
MAX2066 toc05
MAX2066 toc04
1.00
-15
250
450
650
850
50
1050
250
450
650
850
1050
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
INPUT MATCH OVER ATTENUATOR
SETTING vs. RF FREQUENCY
OUTPUT MATCH OVER ATTENUATOR
SETTING vs. RF FREQUENCY
REVERSE ISOLATION OVER ATTENUATOR
SETTING vs. RF FREQUENCY
0dB, 1dB, 2dB, 4dB
8dB
-20
-30
REVERSE ISOLATION (dB)
1dB
-5
OUTPUT MATCH (dB)
0dB
8dB
-10
-15
-20
16dB, 31dB
-40
MAX2066 toc09
16dB
-30
MAX2066 toc08
0
MAX2066 toc07
0
INPUT MATCH (dB)
19
17
5.250
15
-10
20
18
TC = +85°C
15
4.875
25
50
VCC = 4.75V, 5.00V, 5.25V
21
GAIN (dB)
120
100
4.750
MAX2066 toc03
MAX2066 toc03
TC = -40°C
TC = +25°C
TC = +25°C
130
GAIN (dB)
SUPPLY CURRENT (mA)
22
23
21
110
GAIN (dB)
23
MAX2066 toc01
TC = -40°C
140
GAIN vs. RF FREQUENCY
GAIN vs. RF FREQUENCY
SUPPLY CURRENT vs. SUPPLY VOLTAGE
150
-40
ATTENUATOR 0dB
-50
ATTENUATOR 31dB
-60
-25
4dB
31dB
2dB
-70
-30
-50
50
250
450
650
RF FREQUENCY (MHz)
850
1050
50
250
450
650
RF FREQUENCY (MHz)
850
1050
50
250
450
650
850
1050
RF FREQUENCY (MHz)
_______________________________________________________________________________________
5
MAX2066
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.)
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.)
20
10
-10
MAX2066 toc11
7
8
VCC = 4.75V, 5.00V, 5.25V
6
5
TC = +25°C
50
250
450
650
TC = -40°C
3
REFERENCED TO HIGH GAIN STATE
POSITIVE PHASE = ELECTRICALLY SHORTER
250
450
650
50
1050
850
250
OUTPUT P1dB vs. RF FREQUENCY
21
MAX2066 toc13
TC = +85°C
20
VCC = 5.25V
TC = -40°C
19
VCC = 5.00V
18
17
16
16
15
15
1050
POUT = 0dBm/TONE
50
OUTPUT IP3 (dBm)
OUTPUT P1dB (dBm)
18
850
55
TC = +25°C
19
650
OUTPUT IP3 vs. RF FREQUENCY
OUTPUT P1dB vs. RF FREQUENCY
20
450
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
21
OUTPUT P1dB (dBm)
5
2
50
RF FREQUENCY (MHz)
17
6
3
2
1050
850
7
4
4
MAX2066 toc14
0
TC = +85°C
MAX2066 toc15
30
9
NOISE FIGURE (dB)
40
8
NOISE FIGURE (dB)
S21 PHASE CHANGE (DEG)
50
NOISE FIGURE vs. RF FREQUENCY
NOISE FIGURE vs. RF FREQUENCY
9
MAX2066 toc10
60
MAX2066 toc12
ATTENUATOR PHASE CHANGE
BETWEEN STATES vs. RF FREQUENCY
45
TC = +25°C
40
VCC = 4.75V
TC = -40°C
35
TC = +85°C
450
650
850
1050
50
250
450
RF FREQUENCY (MHz)
OUTPUT IP3 vs. RF FREQUENCY
VCC = 5.00V
40
VCC = 4.75V
650
850
1050
650
850
1050
2nd HARMONIC vs. RF FREQUENCY
43
42
POUT = 3dBm
TC = -40°C
70
TC = +85°C
60
TC = +25°C
50
TC = -40°C, +25°C, +85°C, LSB, USB
40
450
RF FREQUENCY (MHz)
6
44
41
30
450
80
2nd HARMONIC (dBc)
VCC = 5.25V
250
250
RF FREQUENCY (MHz)
POUT = 0dBm/TONE
fRF = 200MHz
OUTPUT IP3 (dBm)
50
50
50
1050
45
MAX2066 toc16
POUT = 0dBm/TONE
35
850
OUTPUT IP3 vs. ATTENUATOR STATE
55
45
650
RF FREQUENCY (MHz)
MAX2066 toc18
250
30
MAX2066 toc17
50
OUTPUT IP3 (dBm)
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
40
0
4
8
12
16
20
24
ATTENUATOR STATE (dB)
28
32
50
250
450
650
RF FREQUENCY (MHz)
_______________________________________________________________________________________
850
1050
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
2nd HARMONIC vs. ATTENUATOR STATE
VCC = 4.75V
50
69
68
TC = +25°C
67
100
65
40
450
650
850
4
8
24
28
32
50
TC = -40°C
85
TC = +25°C
55
50
TC = +85°C
45
40
0
1050
60
TC = +25°C
80
TC = -40°C
850
4
8
12
16
20
24
28
32
50
250
ATTENUATOR STATE (dB)
RF FREQUENCY (MHz)
MAX2066 toc25
68
VCC = 5.25V
60
55
POUT = 0dBm/TONE
fRF = 200MHz
TC = -40°C
66
OIP2 (dBm)
VCC = 5.00V
650
850
1050
OIP2 vs. ATTENUATOR STATE
POUT = 0dBm/TONE
70
450
RF FREQUENCY (MHz)
OIP2 vs. RF FREQUENCY
75
65
1050
POUT = 0dBm/TONE
70
650
850
65
VCC = 5.00V
450
650
70
90
60
250
450
OIP2 vs. RF FREQUENCY
75
50
250
75
OIP2 (dBm)
80
TC = +85°C
RF FREQUENCY (MHz)
POUT = 3dBm
fRF = 200MHz
TC = +85°C
95
3rd HARMONIC (dBc)
90
OIP2 (dBm)
3rd HARMONIC (dBc)
20
100
MAX2066 toc22
POUT = 3dBm
VCC = 5.25V
70
16
3rd HARMONIC vs. ATTENUATOR STATE
3rd HARMONIC vs. RF FREQUENCY
110
VCC = 4.75V
12
ATTENUATOR STATE (dB)
RF FREQUENCY (MHz)
100
TC = -40°C
60
0
1050
MAX2066 toc23
250
80
70
66
50
TC = +25°C
90
TC = +85°C
VCC = 5.00V
MAX2066 toc21
MAX2066 toc20
TC = -40°C
POUT = 3dBm
MAX2066 toc24
60
POUT = 3dBm
fRF = 200MHz
70
3rd HARMONIC vs. RF FREQUENCY
110
3rd HARMONIC (dBc)
70
2nd HARMONIC (dBc)
2nd HARMONIC (dBc)
MAX2066 toc19
POUT = 3dBm
VCC = 5.25V
71
MAX2066 toc26
2nd HARMONIC vs. RF FREQUENCY
80
64
TC = +25°C
62
TC = +85°C
50
60
VCC = 4.75V
45
40
58
50
250
450
650
RF FREQUENCY (MHz)
850
1050
0
4
8
12
16
20
24
28
32
ATTENUATOR STATE (dB)
_______________________________________________________________________________________
7
MAX2066
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.)
Typical Operating Characteristics (continued)
(VCC = VDD = +5.0V, digital attenuator only, maximum gain, PIN = -20dBm and TC = +25°C, unless otherwise noted.)
GAIN vs. RF FREQUENCY
(ATTENUATOR ONLY)
GAIN vs. RF FREQUENCY
(ATTENUATOR ONLY)
-1
MAX2066 toc28
0
MAX2066 toc27
0
-1
TC = -40°C
-2
VCC = 4.75V, 5.00V, 5.25V
TC = +25°C
GAIN (dB)
GAIN (dB)
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
-3
-4
-3
-4
TC = +85°C
-5
-5
50
250
450
650
RF FREQUENCY (MHz)
8
-2
850
1050
50
250
450
650
850
1050
RF FREQUENCY (MHz)
_______________________________________________________________________________________
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
20
19
17
TC = +25°C
16
55
4.750
5.000
5.125
250
450
650
850
50
1050
250
450
650
INPUT MATCH OVER ATTENUATOR SETTING
vs. RF FREQUENCY (LOW-CURRENT MODE)
OUTPUT MATCH OVER ATTENUATOR SETTING
vs. RF FREQUENCY (LOW-CURRENT MODE)
NOISE FIGURE vs. RF FREQUENCY
(LOW-CURRENT MODE)
0
0
0dB
8dB
-20
-30
-40
9
0dB, 1dB, 2dB, 4dB
-10
8dB
-15
-20
-30
250
450
650
850
7
6
5
TC = -40°C
2
50
1050
250
450
650
850
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
NOISE FIGURE vs. RF FREQUENCY
(LOW-CURRENT MODE)
OUTPUT P1dB vs. RF FREQUENCY
(LOW-CURRENT MODE)
5
4
3
TC = +25°C
16
15
450
650
850
1050
18
17
VCC = 5.25V
VCC = 5.00V
16
15
VCC = 4.75V
TC = +85°C
14
250
OUTPUT P1dB vs. RF FREQUENCY
(LOW-CURRENT MODE)
OUTPUT P1dB (dBm)
OUTPUT P1dB (dBm)
6
TC = -40°C
17
50
MAX2066 toc36
VCC = 4.75V, 5.00V, 5.25V
7
1050
RF FREQUENCY (MHz)
18
MAX2066 toc35
9
8
8
3
2dB
-50
50
TC = +25°C
TC = +85°C
4
16dB, 31dB
-25
MAX2066 toc34
10
MAX2066 toc37
4dB
MAX2066 toc33
-5
1dB
11
NOISE FIGURE (dB)
31dB
MAX2066 toc32
RF FREQUENCY (MHz)
16dB
1050
850
RF FREQUENCY (MHz)
OUTPUT MATCH (dB)
INPUT MATCH (dB)
15
50
5.250
VCC (V)
-10
NOISE FIGURE (dB)
16
15
4.875
19
TC = +85°C
17
TC = +85°C
20
18
18
65
VCC = 4.75V, 5.00V, 5.25V
21
GAIN (dB)
75
22
TC = -40°C
21
MAX2066 toc31
22
TC = +25°C
TC = -40°C
23
MAX2066 toc30
MAX2066 toc29
23
GAIN (dB)
SUPPLY CURRENT (mA)
85
GAIN vs. RF FREQUENCY
(LOW-CURRENT MODE)
GAIN vs. RF FREQUENCY
(LOW-CURRENT MODE)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(LOW-CURRENT MODE)
14
2
13
13
1
50
250
450
650
RF FREQUENCY (MHz)
850
1050
50
250
450
650
RF FREQUENCY (MHz)
850
1050
50
250
450
650
850
1050
RF FREQUENCY (MHz)
_______________________________________________________________________________________
9
MAX2066
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.)
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.)
VCC = 5.00V
40
OUTPUT IP3 (dBm)
TC = -40°C
35
TC = +85°C
43
35
VCC = 4.75V
30
30
250
450
850
650
39
TC = +25°C USB
TC = +85°C USB
TC = +85°C LSB
250
450
650
850
0
1050
4
8
12
16
20
24
28
32
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
ATTENUATOR STATE (dB)
2nd HARMONIC vs. RF FREQUENCY
(LOW-CURRENT MODE)
2nd HARMONIC vs. RF FREQUENCY
(LOW-CURRENT MODE)
2nd HARMONIC vs. ATTENUATOR STATE
(LOW-CURRENT MODE)
TC = -40°C
60
TC = +25°C
50
VCC = 5.25V
70
73
VCC = 5.00V
60
VCC = 4.75V
40
850
650
TC = +25°C
71
70
TC = +85°C
TC = -40°C
69
68
40
450
POUT = 3dBm
fRF = 200MHz
72
50
TC = +85°C
250
MAX2066 toc43
POUT = 3dBm
2nd HARMONIC (dBc)
70
80
2nd HARMONIC (dBc)
POUT = 3dBm
MAX2066 toc42
80
67
50
1050
250
450
850
650
1050
0
4
8
12
16
20
24
28
32
RF FREQUENCY (MHz)
ATTENUATOR STATE (dB)
3rd HARMONIC vs. RF FREQUENCY
(LOW-CURRENT MODE)
3rd HARMONIC vs. RF FREQUENCY
(LOW-CURRENT MODE)
3rd HARMONIC vs. ATTENUATOR STATE
(LOW-CURRENT MODE)
POUT = 3dBm
100
POUT = 3dBm
100
3rd HARMONIC (dBc)
TC = -40°C
90
110
TC = +25°C
80
70
VCC = 5.00V
90
VCC = 5.25V
80
70
90
POUT = 3dBm
fRF = 200MHz
TC = +25°C
3rd HARMONIC (dBc)
110
MAX2066 toc46
RF FREQUENCY (MHz)
MAX2066 toc44
50
TC = +25°C LSB
41
35
50
1050
MAX2066 toc41
50
TC = -40°C LSB TC = -40°C USB
37
25
25
2nd HARMONIC (dBc)
VCC = 5.25V
POUT = 0dBm/TONE
fRF = 200MHz
MAX2066 toc45
OUTPUT IP3 (dBm)
40
45
MAX2066 toc40
POUT = 0dBm/TONE
OUTPUT IP3 (dBm)
TC = +25°C
45
MAX2066 toc39
POUT = 0dBm/TONE
MAX2066 toc38
45
OUTPUT IP3 vs. ATTENUATOR STATE
(LOW-CURRENT MODE)
OUTPUT IP3 vs. RF FREQUENCY
(LOW-CURRENT MODE)
OUTPUT IP3 vs. RF FREQUENCY
(LOW-CURRENT MODE)
3rd HARMONIC (dBc)
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
TC = +85°C
85
80
TC = -40°C
VCC = 4.75V
TC = +85°C
60
60
50
250
450
650
RF FREQUENCY (MHz)
10
850
1050
75
50
250
450
650
RF FREQUENCY (MHz)
850
1050
0
4
8
12
16
20
24
ATTENUATOR STATE (dB)
______________________________________________________________________________________
28
32
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
OIP2 vs. RF FREQUENCY
(LOW-CURRENT MODE)
70
75
POUT = 0dBm/TONE
70
POUT = 0dBm/TONE
fRF = 200MHz
TC = -40°C
68
65
TC = -40°C
60
TC = +25°C
55
50
VCC = 5.25V
60
VCC = 5.00V
55
66
64
VCC = 4.75V
50
TC = +85°C
OIP2 (dBm)
OIP2 (dBm)
65
OIP2 (dBm)
70
MAX2066 toc49
POUT = 0dBm/TONE
MAX2066 toc47
75
OIP2 vs. ATTENUATOR STATE
(LOW-CURRENT MODE)
MAX2066 toc48
OIP2 vs. RF FREQUENCY
(LOW-CURRENT MODE)
TC = +25°C
TC = +85°C
62
45
45
40
40
50
250
450
650
RF FREQUENCY (MHz)
850
1050
60
50
250
450
650
RF FREQUENCY (MHz)
850
1050
0
4
8
12
16
20
24
28
32
ATTENUATOR STATE (dB)
______________________________________________________________________________________
11
MAX2066
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.)
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
TC = -40°C
19
3.30
3.45
3.60
15
50
250
650
850
1050
VCC (V)
RF FREQUENCY (MHz)
INPUT MATCH OVER ATTENUATOR
SETTING vs. RF FREQUENCY
OUTPUT MATCH OVER ATTENUATOR
SETTING vs. RF FREQUENCY
1dB
8dB
0dB
-20
-30
-40
31dB
-15
-20
16dB, 31dB
-25
2dB
4dB
0dB, 1dB, 2dB, 4dB
-10
VCC = 3.3V
450
650
850
250
450
650
850
TC = -40°C
1050
VCC = 3.3V
16
TC = -40°C
OUTPUT P1dB (dBm)
6
5
VCC = 3.6V
3
2
250
450
650
RF FREQUENCY (MHz)
250
15
850
1050
650
850
17
16
TC = +25°C
14
13
12
450
1050
OUTPUT P1dB vs. RF FREQUENCY
TC = +85°C
VCC = 3.3V
VCC = 3.6V
15
14
13
12
11
11
10
10
VCC = 3.0V
9
9
50
50
RF FREQUENCY (MHz)
17
MAX2066 toc56
VCC = 3.3V
7
4
TC = +25°C
OUTPUT P1dB vs. RF FREQUENCY
NOISE FIGURE vs. RF FREQUENCY
9
VCC = 3.0V
5
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
8
6
2
50
1050
7
3
OUTPUT P1dB (dBm)
250
1050
4
8dB
MAX2066 toc57
50
850
650
TC = +85°C
8
-30
-50
450
NOISE FIGURE vs. RF FREQUENCY
NOISE FIGURE (dB)
16dB
250
9
MAX2066 toc54
-10
VCC = 3.3V
-5
OUTPUT MATCH (dB)
VCC = 3.3V
50
RF FREQUENCY (MHz)
0
MAX2066 toc53
0
12
450
MAX2066 toc55
3.15
VCC = 3.0V
16
15
3.00
VCC = 3.3V
19
17
16
40
20
18
TC = +85°C
17
TC = +85°C
INPUT MATCH (dB)
20
18
50
VCC = 3.6V
21
TC = +25°C
MAX2066 toc58
60
22
GAIN (dB)
GAIN (dB)
21
MAX2066 toc52
VCC = 3.3V
22
TC = +25°C
70
GAIN vs. RF FREQUENCY
23
MAX2066 toc51
TC = -40°C
SUPPLY CURRENT (mA)
GAIN vs. RF FREQUENCY
23
MAX2066 toc50
80
NOISE FIGURE (dB)
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
50
250
450
650
RF FREQUENCY (MHz)
850
1050
50
250
450
650
RF FREQUENCY (MHz)
______________________________________________________________________________________
850
1050
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
OUTPUT IP3 vs. RF FREQUENCY
30
40
VCC = 3.3V
VCC = 3.6V
35
30
TC = +25°C LSB
39
38
37
36
TC = -40°C LSB
TC = -40°C USB
TC = +85°C USB
VCC = 3.0V
25
TC = +85°C LSB
35
25
TC = +85°C
34
20
20
450
650
850
50
1050
250
2nd HARMONIC vs. RF FREQUENCY
1050
0
TC = +25°C
60
50
70
30
VCC = 3.6V
60
50
650
850
1050
28
32
VCC = 3.3V
fRF = 200MHz
POUT = 3dBm
TC = +25°C
60
TC = -40°C
450
650
850
1050
0
4
8
RF FREQUENCY (MHz)
12
16
20
24
28
32
ATTENUATOR STATE (dB)
3rd HARMONIC vs. RF FREQUENCY
3rd HARMONIC vs. RF FREQUENCY
90
TC = +25°C
80
TC = +85°C
70
POUT = 3dBm
100
3rd HARMONIC (dBc)
VCC = 3.3V
POUT = 3dBm
110
MAX2066 toc65
110
3rd HARMONIC (dBc)
24
50
250
RF FREQUENCY (MHz)
60
20
55
50
100
16
TC = +85°C
65
VCC = 3.0V
30
450
12
70
VCC = 3.3V
40
TC = -40°C
250
8
2nd HARMONIC vs. ATTENUATOR STATE
POUT = 3dBm
2nd HARMONIC (dBc)
TC = +85°C
50
4
ATTENUATOR STATE (dB)
80
MAX2066 toc62
VCC = 3.3V
POUT = 3dBm
2nd HARMONIC (dBc)
850
2nd HARMONIC vs. RF FREQUENCY
80
40
650
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
70
450
2nd HARMONIC (dBc)
250
MAX2066 toc63
50
VCC = 3.3V
fRF = 200MHz
POUT = 0dBm/TONE
MAX2066 toc64
TC = -40°C
MAX2066 toc60
45
TC = +25°C USB
90
VCC = 3.3V
VCC = 3.6V
80
70
60
TC = -40°C
MAX2066 toc66
35
40
OUTPUT IP3 (dBm)
TC = +25°C
40
POUT = 0dBm/TONE
OUTPUT IP3 (dBm)
OUTPUT IP3 (dBm)
45
MAX2066 toc59
VCC = 3.3V
POUT = 0dBm/TONE
OUTPUT IP3 vs. ATTENUATOR STATE
50
MAX2066 toc61
OUTPUT IP3 vs. RF FREQUENCY
50
VCC = 3.0V
50
50
50
250
450
650
RF FREQUENCY (MHz)
850
1050
50
250
450
650
850
1050
RF FREQUENCY (MHz)
______________________________________________________________________________________
13
MAX2066
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.)
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
VCC = 3.3V
POUT = 0dBm/TONE
TC = +85°C
60
MAX2068 toc68
VCC = 3.3V
fRF = 200MHz
POUT = 3dBm
80
TC = +85°C
TC = +25°C
OIP2 (dBm)
50
75
TC = -40°C
40
TC = -40°C
TC = +25°C
30
70
0
4
8
12
16
20
24
28
32
50
250
450
ATTENUATOR STATE (dB)
OIP2 vs. RF FREQUENCY
850
1050
OIP2 vs. ATTENUATOR STATE
POUT = 0dBm/TONE
VCC = 3.3V
70
MAX2066 toc69
70
60
650
RF FREQUENCY (MHz)
VCC = 3.3V
fRF = 200MHz
POUT = 0dBm/TONE
TC = +85°C
MAX2066 toc70
3rd HARMONIC (dBc)
OIP2 vs. RF FREQUENCY
70
MAX2066 toc67
85
60
VCC = 3.6V
OIP2 (dBm)
OIP2 (dBm)
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
50
50
TC = +25°C
TC = -40°C
40
40
VCC = 3.0V
30
30
50
250
450
650
RF FREQUENCY (MHz)
14
850
1050
0
4
8
12
16
20
24
28
ATTENUATOR STATE (dB)
______________________________________________________________________________________
32
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
PIN
NAME
1, 16, 19, 22,
24–28, 30,
31, 33–36
GND
Ground
2, 3, 32,
37–40
GND
Ground. See the Pin-Compatibility Considerations section.
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
10
STATE_B
DESCRIPTION
Digital Logic Supply Input. Connect to the digital logic power supply, VDD. Bypass to GND with a
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.
Digital Attenuator Preprogrammed Attenuation State Logic Input
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
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
18
RSET
20
AMP_IN
21
VCC_AMP
23
ATTEN_OUT
29
ATTEN_IN
—
EP
Driver Amplifier Output (50Ω). See the Typical Application Circuit for details.
Driver Amplifier Bias Setting. See the External Bias section.
Driver Amplifier Input (50Ω). See the Typical Application Circuit for details.
Driver Amplifier Supply Voltage Input. Connect to the VCC power supply. Bypass to GND with
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.
Exposed Pad. Internally connected to GND. Connect EP to GND for proper RF performance and
enhanced thermal dissipation.
______________________________________________________________________________________
15
MAX2066
Pin Description
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
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
SER/PAR
ATTENUATOR
0
Parallel controlled
1
SPI controlled
MICROWIRE is a trademark of National Semiconductor Corp.
16
______________________________________________________________________________________
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
MAX2066
MSB
LSB
DN
DATA
D(N - 1)
D1
D0
CLOCK
tCW
tCS
tCH
CS
tES
tEWS
tEW
Figure 1. SPI Timing Diagram
Table 2. SPI Data Format
FUNCTION
BIT
D27 (MSB)
Digital Attenuator State 4
DESCRIPTION
16dB step (MSB of the 5-bit word used to program the digital attenuator state 4)
D26
8dB step
D25
4dB step
D24
2dB step
D23
1dB step (LSB)
D22
D21
Digital Attenuator State 3
D20
5-bit word used to program the digital attenuator state 3 (see the description for digital
attenuator state 4)
D19
D18
D17
D16
Digital Attenuator State 2
D15
5-bit word used to program the digital attenuator state 2 (see the description for digital
attenuator state 4)
D14
D13
D12
D11
Digital Attenuator State 1
D10
5-bit word used to program the digital attenuator state 1 (see the description for digital
attenuator state 4)
D9
D8
______________________________________________________________________________________
17
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
Table 2. SPI Data Format (continued)
FUNCTION
BIT
DESCRIPTION
D7
D6
D5
Reserved
D4
Bits D[7:0] are reserved. Set to logic 0.
D3
D2
D1
D0 (LSB)
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)
INPUT
18
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
______________________________________________________________________________________
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
Table 4. Preprogrammed Attenuation
State Settings
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
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.
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.
Table 5. MAX2065/MAX2066 Pin
Comparison
PIN
MAX2065
MAX2066
2
VREF_SELECT
GND
+5V and +3.3V Supply Voltage
3
VDAC_EN
GND
The MAX2066 features an optional +3.3V supply voltage
operation with slightly reduced linearity performance.
32
ATTEN1_OUT
GND
37
ATTEN1_IN
GND
Pin-Compatibility Considerations
38
VCC_ANALOG
GND
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.)
39
ANALOG_VCTRL
GND
40
VREF_IN
GND
______________________________________________________________________________________
19
MAX2066
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).
MAX2066
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
Table 6. Typical Application Circuit Component Values (HC Mode)
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)
Maxim Integrated
Products, Inc.
MAX2066ETL+
Table 7. Typical Application Circuit Component Values (LC Mode)
DESIGNATION
VALUE
SIZE
VENDOR
C1, C2, C7
10nF
0402
Murata Mfg. Co., Ltd.
DESCRIPTION
X7R
C3, C4, C6, C8, C9
1000pF
0402
Murata Mfg. Co., Ltd.
C0G ceramic capacitors
1008CS-471XJLC
L1
470nH
1008
Coilcraft, Inc.
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.
MAX2066ETL+
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.
26
25
GND
GND
L
24
23
22
C
GND
C8
ATTEN_OUT
GND
VCC
21
VCC_AMP
C6
C7
Figure 2. Bandpass Filter to Reduce Amplitude Overshoot
20
______________________________________________________________________________________
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
GND
GND
GND
GND
GND
GND
GND
GND
DIGITAL
ATTENUATOR
MAX2066
4
5
6
7
8
27
26
25
24
23
DRIVER AMP
9
22
10
21
12
13
14
15
16
17
18
19
GND
ATTEN_IN
C9
RF INPUT
GND
GND
GND
GND
GND
ATTEN_OUT
C8
GND
VCC
VCC_AMP
20
AMP_IN
11
GND
STATE_B
31
28
RSET
STATE_A
32
3
AMP_OUT
SER/PAR
33
29
D4
C1
34
GND
VDD_LOGIC
35
2
D0
CS
VDD
36
30
D1
CLK
37
EP
D2
DATA
38
39
SPI INTERFACE
GND
40
1
D3
GND
GND
GND
+
GND
C6
C7
R2
R1
R3
VCC
L1
C2
C3
R1A*
C4
RF OUTPUT
*IN LC MODE, R1A IS A 0.01μF CAPACITOR. SEE TABLE 7 FOR DETAILS.
______________________________________________________________________________________
21
MAX2066
Typical Application Circuit
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
MAX2066
Pin Configuration/Functional Block Diagram
GND
GND
GND
GND
GND
GND
GND
GND
GND
+
GND
TOP VIEW
40
39
38
37
36
35
34
33
32
31
GND 1
30 GND
GND 2
29 ATTEN_IN
GND 3
28 GND
DATA 4
DIGITAL
ATTENUATOR
MAX2066
CLK 5
SPI INTERFACE
CS 6
VDD_LOGIC 7
SER/PAR 8
27 GND
26 GND
25 GND
24 GND
23 ATTEN_OUT
DRIVER AMP
STATE_A 9
22 GND
15
16
17
18
19
20
AMP_OUT
RSET
GND
AMP_IN
D2
14
GND
13
D0
12
D1
11
D3
21 VCC_AMP
D4
STATE_B 10
TQFN
EXPOSED PAD ON BOTTOM.
CONNECT EP TO GND.
Chip Information
PROCESS: SiGe BiCMOS
22
______________________________________________________________________________________
50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
MAX2066
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
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.