MAXIM MAX2027EUP-T

19-2601; Rev 0; 10/02
IF Digitally Controlled Variable-Gain Amplifier
Features
♦ 50MHz to 400MHz Frequency Range
The device integrates a digitally controlled attenuator
and a high-linearity IF amplifier in one package.
Targeted for IF signal chains to adjust gain either
dynamically or as a one-time channel gain setting, the
MAX2027 is ideal for applications requiring high performance. The attenuator provides 23dB of attenuation
range with ±0.2dB accuracy.
The MAX2027 is available in a thermally enhanced 20pin TSSOP-EP package and operates over the -40°C to
+85°C temperature range.
♦ Output IP3: 40dBm (at All Gain Settings and
50MHz)
♦ Variable Gain: -8dB to +15dB
♦ Noise Figure: 4.7dB at Maximum Gain
♦ Digitally Controlled Gain with 1dB Resolution and
±0.2dB Accuracy
Ordering Information
PART
MAX2027EUP-T
TEMP RANGE
PIN-PACKAGE
-40°C to +85°C
20 TSSOP-EP*
*EP = exposed pad.
Pin Configuration/
Functional Diagram
Applications
Cellular Base Stations
Receiver Gain Control
VCC
1
VCC
2
RF_IN
3
18 ATTNOUT
GND
4
17 GND
GND
5
16 GND
B4
6
15 AMPIN
B3
7
Transmitter Gain Control
Broadband Systems
Automatic Test Equipment
Terrestrial Links
B2
8
B1
9
B0 10
20 GND
MAX2027
ATTENUATION
LOGIC
CONTROL
AMP
BIAS
19 GND
14 IBIAS
13 ISET
12 RF_OUT
11 VCC
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX2027
General Description
The MAX2027 high-performance, digitally controlled
variable-gain amplifier is designed for use from 50MHz
to 400MHz.
MAX2027
IF Digitally Controlled Variable-Gain Amplifier
ABSOLUTE MAXIMUM RATINGS
All Pins (except B0–B4)
to GND................................................................-0.3V to +5.5V
Input Voltage Levels (B0–B4).....................-0.3V to (VCC + 0.5V)
RF Input Signal .................................................................20dBm
Continuous Power Dissipation (TA = +70°C)
20-Pin TSSOP-EP
(derate 21.7mW/°C above +70°C) ..................................1.7W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
DC ELECTRICAL CHARACTERISTICS
(Typical application circuit, VCC = +4.75V to +5.25V, GND = 0V. No RF signals applied, and RF input and output ports are terminated
with 50Ω. R1 = 825Ω, TA = -40°C to +85°C. Typical values are at VCC = +5V and TA = +25°C, unless otherwise noted.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
4.75
5
5.25
V
70
SUPPLY
Supply Voltage
VCC
Supply Current
ICC
60
ISET Current
ISET
0.9
mA
mA
5
Bits
CONTROL INPUTS/OUTPUTS
Control Bits
Parallel
Input Logic High
(Note 3)
VCC - 0.5
Input Logic Low
Input Leakage Current
2
-2
_______________________________________________________________________________________
V
0.5
V
+2
µA
IF Digitally Controlled Variable-Gain Amplifier
(Typical application circuit without matching, VCC = +4.75V to +5.25V, GND = 0V, max gain (B0 = B1 = B2 = B3 = B4 = 0), R1 =
825Ω, POUT = 5dBm, fIN = 50MHz, 50Ω RF system impedance. Typical values are at VCC = +5V and TA = +25°C, unless otherwise
noted.) (Notes 1, 2)
PARAMETER
SYMBOL
Frequency Range
fR
Gain
G
Noise Figure
NF
Minimum Reverse Isolation
CONDITIONS
MIN
TYP
50
Max gain
15.3
MAX
UNITS
400
MHz
dB
Max gain
4.7
dB
Max gain
22
dB
20.6
dBm
Output 1dB Compression Point
P1dB
Max gain
2nd-Order Output Intercept Point
OIP2
f1 + f2, f1 = 50MHz, f2 = 51MHz,
5dBm/tone at RF_OUT
42
dBm
3rd-Order Output Intercept Point
OIP3
All gain conditions, 5dBm/tone at RF_OUT
40
dBm
2nd Harmonic
2fIN
All gain conditions
-42
dBc
3rd Harmonic
3fIN
All gain conditions
-68
dBc
23
dB
1
dB
±0.2
dB
RF Gain-Control Range
Gain-Control Resolution
Attenuation Absolute Accuracy
Compared to the ideal expected
attenuation
Attenuation Relative Accuracy
Between adjacent states
±0.2
dB
Gain Drift Over Temperature
TA = -40°C to +85°C
±0.1
dB
Gain Flatness Over 50MHz BW
Peak-to-peak for all settings
0.3
dB
Attenuator Switching Time
50% control to 90% RF
40
ns
Input Return Loss
fR = 50MHz to 150MHz, all gain conditions
15
dB
Output Return Loss
fR = 50MHz to 150MHz, all gain conditions
15
dB
Note 1: Guaranteed by design and characterization.
Note 2: All limits reflect losses of external components. Output measurements are taken at RF OUT using the typical application
circuit.
Note 3: Device draws current in excess of the specified supply current when a digital input is driven with a voltage of VIN < VCC - 0.5V
or VIN > 0.5V. This is due to the CMOS input stage crowbar current. Part may be damaged if operated in this condition for an
extended period of time.
_______________________________________________________________________________________
3
MAX2027
AC ELECTRICAL CHARACTERISTICS
Typical Operating Characteristics
(Typical application circuit, VCC = 5.0V, max gain (B0 = B1 = B2 = B3 = B4 = 0), POUT = 5dBm, R1 = 825Ω, TA = +25°C, unless otherwise noted. External matching components for 300MHz in Table 2 are used for matched circuit.)
VCC = 5.0V
VCC = 5.25V
62
60
58
VCC = 4.75V
56
52
25
5
20
35
50
65
80
10
15
20
25
30
35
-40 -25 -10
35
50
100
150
200
250
300
350
400
50
100
150
200
250
300
350
400
TEMPERATURE (°C)
FREQUENCY (MHz)
FREQUENCY (MHz)
GAIN vs. RF FREQUENCY WITHOUT MATCHING
(ALL STATES)
REVERSE ISOLATION
vs. FREQUENCY WITHOUT MATCHING
INPUT RETURN LOSS
vs. RF FREQUENCY WITH MATCHING
(ALL STATES)
10
5
0
-5
25
20
15
-10
10
-15
5
100
150
200
250
300
350
400
MAX2027 toc06
10
15
20
25
30
35
40
50
100
150
200
250
300
350
400
250 260 270 280 290 300 310 320 330 340 350
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
OUTPUT RETURN LOSS
vs. RF FREQUENCY WITH MATCHING
(ALL STATES)
GAIN vs. RF FREQUENCY WITH MATCHING
(ALL STATES)
REVERSE ISOLATION
vs. FREQUENCY WITH MATCHING
15
10
10
GAIN (dB)
15
20
5
0
25
-5
30
-15
40
25
20
15
10
-10
35
30
REVERSE ISOLATION (dB)
5
35
MAX2027 toc09
20
MAX2027 toc07
0
MAX2027 toc08
50
5
INPUT RETURN LOSS (dB)
30
REVERSE ISOLATION (dB)
15
0
MAX2027 toc05
35
MAX2027 toc04
20
GAIN (dB)
20
5
30
54
4
15
MAX2027 toc03
10
0
OUTPUT RETURN LOSS (dB)
64
MAX2027 toc02
MAX2027 toc01
5
INPUT RETURN LOSS (dB)
SUPPLY CURRENT (mA)
66
OUTPUT RETURN LOSS
vs. RF FREQUENCY WITHOUT MATCHING
(ALL STATES)
INPUT RETURN LOSS
vs. RF FREQUENCY WITHOUT MATCHING
(ALL STATES)
SUPPLY CURRENT vs. TEMPERATURE
68
OUTPUT RETURN LOSS (dB)
MAX2027
IF Digitally Controlled Variable-Gain Amplifier
5
250 260 270 280 290 300 310 320 330 340 350
250 260 270 280 290 300 310 320 330 340 350
250 260 270 280 290 300 310 320 330 340 350
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
_______________________________________________________________________________________
IF Digitally Controlled Variable-Gain Amplifier
17
16
TA = +25°C, +85°C
14
13
12
11
10
14
100
150
200
250
300
350
12
11
11
TA = +85°C
10
50
100
150
200
250
300
350
250 260 270 280 290 300 310 320 330 340 350
400
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
ATTENUATION ABSOLUTE ACCURACY
WITHOUT MATCHING (ALL STATES)
ATTENUATION ABSOLUTE ACCURACY
WITH MATCHING (ALL STATES)
ATTENUATION RELATIVE ACCURACY
WITHOUT MATCHING (ALL STATES)
0.4
0.2
0
-0.2
-0.4
-0.6
1.0
0.5
0
0.4
-0.5
-1.0
100
150
200
250
300
350
400
0
-0.2
-0.4
-0.6
-1.0
250 260 270 280 290 300 310 320 330 340 350
50
100
150
200
250
300
350
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
ATTENUATION RELATIVE ACCURACY
WITH MATCHING (ALL STATES)
NOISE FIGURE vs. FREQUENCY
WITHOUT MATCHING
NOISE FIGURE vs. FREQUENCY
WITH MATCHING
7.0
MAX2027 toc14b
0.4
0.3
0.1
0
-0.1
TA = +85°C
6.0
NOISE FIGURE (dB)
0.2
6.5
TA = +25°C
5.5
5.0
4.5
4.0
TA = -40°C
6.5
6.0
5.5
5.0
4.5
3.5
-0.3
3.0
3.0
-0.4
2.5
2.5
-0.5
2.0
FREQUENCY (MHz)
TA = +85°C
TA = +25°C
TA = -40°C
4.0
-0.2
250 260 270 280 290 300 310 320 330 340 350
400
7.0
NOISE FIGURE (dB)
0.5
MAX2027 toc15
50
0.2
-0.8
-0.8
-1.0
MAX2027 toc14a
1.5
0.6
RELATIVE ACCURACY (dB)
0.6
2.0
MAX2027 toc13b
0.8
ABSOLUTE ACCURACY (dB)
MAX2027 toc13a
1.0
RELATIVE ACCURACY (dB)
TA = +25°C
14
12
400
TA = -40°C
15
13
VCC = 5.25V
10
50
ABSOLUTE ACCURACY (dB)
15
13
TA = -40°C
16
VCC = 4.75V
VCC = 5.0V
MAX2027 toc16
GAIN (dB)
GAIN (dB)
16
17
GAIN (dB)
17
18
MAX2027 toc11
18
MAX2027 toc10
18
15
GAIN vs. FREQUENCY
WITH MATCHING
GAIN vs. FREQUENCY
WITHOUT MATCHING
MAX2027 toc12
GAIN vs. FREQUENCY
WITHOUT MATCHING
3.5
2.0
50
100
150
200
250
300
FREQUENCY (MHz)
350
400
250 260 270 280 290 300 310 320 330 340 350
FREQUENCY (MHz)
_______________________________________________________________________________________
5
MAX2027
Typical Operating Characteristics (continued)
(Typical application circuit, VCC = 5.0V, max gain (B0 = B1 = B2 = B3 = B4 = 0), POUT = 5dBm, R1 = 825Ω, TA = +25°C, unless otherwise noted. External matching components for 300MHz in Table 2 are used for matched circuit.)
Typical Operating Characteristics (continued)
(Typical application circuit, VCC = 5.0V, max gain (B0 = B1 = B2 = B3 = B4 = 0), POUT = 5dBm, R1 = 825Ω, TA = +25°C, unless otherwise noted. External matching components for 300MHz in Table 2 are used for matched circuit.)
19
TA = +25°C
23
21
VCC = +5.25V
20
VCC = +4.75V
19
22
OUTPUT P1dB (dBm)
20
TA = -40°C
22
OUTPUT P1dB (dBm)
TA = +85°C
21
OUTPUT P1dB vs. FREQUENCY
WITH MATCHING
MAX2027 toc18
22
OUTPUT P1dB (dBm)
23
MAX2027 toc17
23
OUTPUT P1dB vs. FREQUENCY
WITHOUT MATCHING
MAX2027 toc19
OUTPUT P1dB vs. FREQUENCY
WITHOUT MATCHING
21
TA = +85°C
20
TA = -40°C
19
TA = +25°C
VCC = +5V
18
18
17
100
150
200
250
300
350
100
150
200
250
300
350
250 260 270 280 290 300 310 320 330 340 350
400
FREQUENCY (MHz)
OUTPUT IP3 vs. FREQUENCY
WITHOUT MATCHING
OUTPUT IP3 vs. FREQUENCY
WITHOUT MATCHING
OUTPUT IP3 vs. FREQUENCY
WITH MATCHING
38
36
TA = -40°C
TA = +85°C
32
30
40
VCC = +5.25V
38
36
VCC = +4.75V
VCC = +5V
100
150
200
250
300
350
32
30
TA = -40°C
TA = +85°C
28
50
100
150
200
250
300
350
250 260 270 280 290 300 310 320 330 340 350
400
FREQUENCY (MHz)
FREQUENCY (MHz)
INPUT IP3 vs. ATTENUATION STATE
WITHOUT MATCHING
INPUT IP3 vs. ATTENUATION STATE
WITH MATCHING
2ND HARMONIC vs. FREQUENCY
WITHOUT MATCHING
45
-25
-30
35
fIN = 200MHz
30
40
HARMONIC (dBc)
INPUT IP3 (dBm)
45
fIN = 50MHz
fIN = 50MHz
35
fIN = 200MHz
fIN = 400MHz
30
fIN = 400MHz
25
25
20
20
15
15
MAX2027 toc25
PRF1 = PRF2 = 5dBm
AT OUTPUT, ∆f = 1MHz
50
-20
MAX2027 toc24
55
MAX2027 toc23
PRF1 = PRF2 = 5dBm
AT OUTPUT, ∆f = 1MHz
40
34
32
400
TA = +25°C
36
FREQUENCY (MHz)
55
50
38
34
30
50
PRF1 = PRF2 = 5dBm
AT OUTPUT, ∆f = 1MHz
40
OUTPUT IP3 (dBm)
OUTPUT IP3 (dBm)
TA = +25°C
PRF1 = PRF2 = 5dBm
AT OUTPUT, ∆f = 1MHz
42
42
MAX2027 toc21
44
MAX2027 toc22
FREQUENCY (MHz)
40
34
17
50
FREQUENCY (MHz)
PRF1 = PRF2 = 5dBm
AT OUTPUT, ∆f = 1MHz
42
400
MAX2027 toc20
44
OUTPUT IP3 (dBm)
18
17
50
INPUT IP3 (dBm)
MAX2027
IF Digitally Controlled Variable-Gain Amplifier
-35
TA = +25°C
-40
-45
-50
TA = -40°C
TA = +85°C
-55
-60
0
4
8
12
16
ATTENUATION STATE
6
20
24
-65
-70
0
4
8
12
16
ATTENUATION STATE
20
24
50
100
150
200
250
300
FREQUENCY (MHz)
_______________________________________________________________________________________
350
400
IF Digitally Controlled Variable-Gain Amplifier
2ND HARMONIC vs. FREQUENCY
WITH MATCHING
-25
-30
-40
HARMONIC (dBc)
VCC = +5.25V
-45
VCC = +4.75V
-50
-35
TA = +25°C
-40
-45
-50
TA = +85°C
-55
47
TA = -40°C
TA = +25°C
43
41
TA = -40°C
39
-60
-55
37
-65
-60
-70
150
200
250
300
350
200
250
300
350
OUTPUT IP2 vs. FREQUENCY
WITHOUT MATCHING (f1 + f2)
OUTPUT IP2 vs. FREQUENCY
WITH MATCHING (f1 + f2)
3RD HARMONIC vs. FREQUENCY
WITHOUT MATCHING
47
OUTPUT IP2 (dBm)
VCC = +5.25V
TA = +25°C
45
43
41
39
39
37
37
35
PRF1 = PRF2 = 5dBm
AT OUTPUT, ∆f = 1MHz
TA = +85°C
TA = -40°C
200
250
300
350
400
TA = -40°C
-75
-85
FREQUENCY (MHz)
50
FREQUENCY (MHz)
150
200
250
300
350
400
3RD HARMONIC vs. FREQUENCY
WITH MATCHING
MAX2027 toc32
-55
-60
TA = +25°C
HARMONIC (dBc)
VCC = +4.75V
HARMONIC (dBc)
100
FREQUENCY (MHz)
3RD HARMONIC vs. FREQUENCY
WITHOUT MATCHING
-60
TA = +25°C
-70
250 260 270 280 290 300 310 320 330 340 350
-55
TA = +85°C
-65
MAX2027 toc33
150
-60
-80
35
100
400
-55
HARMONIC (dBc)
49
VCC = +4.75V
50
150
FREQUENCY (MHz)
43
41
100
FREQUENCY (MHz)
VCC = +5V
45
50
FREQUENCY (MHz)
PRF1 = PRF2 = 5dBm
AT OUTPUT, ∆f = 1MHz
47
35
250 260 270 280 290 300 310 320 330 340 350
400
MAX2027 toc30
49
100
MAX2027 toc29
50
OUTPUT IP2 (dBm)
TA = +85°C
45
MAX2027 toc31
HARMONIC (dBc)
VCC = +5V
PRF1 = PRF2 = 5dBm
AT OUTPUT, ∆f = 1MHz
49
OUTPUT IP2 (dBm)
-35
MAX2027 toc27
-20
MAX2027 toc26
-30
OUTPUT IP2 vs. FREQUENCY
WITHOUT MATCHING (f1 + f2)
MAX2027 toc28
2ND HARMONIC vs. FREQUENCY
WITHOUT MATCHING
-65
-70
VCC = +5V
VCC = +5.25V
-75
-80
-65
-70
TA = -40°C
TA = +85°C
-75
-80
-85
-85
50
100
150
200
250
300
FREQUENCY (MHz)
350
400
250 260 270 280 290 300 310 320 330 340 350
FREQUENCY (MHz)
_______________________________________________________________________________________
7
MAX2027
Typical Operating Characteristics (continued)
(Typical application circuit, VCC = 5.0V, max gain (B0 = B1 = B2 = B3 = B4 = 0), POUT = 5dBm, R1 = 825Ω, TA = +25°C, unless otherwise noted. External matching components for 300MHz in Table 2 are used for matched circuit.)
IF Digitally Controlled Variable-Gain Amplifier
MAX2027
Pin Description
PIN
NAME
FUNCTION
Power Supply. Bypass to GND with capacitors as close to the pin as possible as shown in the typical
application circuit (Figure 1).
1, 2, 11
VCC
3
RF_IN
Signal Input. See the typical application circuit for recommended component values. Requires an
external DC-blocking capacitor.
4, 5, 16, 17,
19, 20, EP
GND
Ground. Use low-inductance layout techniques on PC board. Solder the exposed pad evenly to the
board ground plane.
6–10
B4–B0
12
RF_OUT
Gain-Control Bits. See Table 3 for gain setting.
Signal Output. Requires an external pullup choke inductor (52mA typical current) to VCC along with a
DC-blocking capacitor (Figure 1).
13
ISET
Connect an 825Ω resistor from ISET to GND.
14
IBIAS
Amplifier Bias. Connect to AMPIN (pin 15) through a choke inductor (0.3mA typ).
15
AMPIN
18
ATTNOUT
Amplifier Input. Requires a DC-coupling capacitor to allow biasing.
Attenuator Output. Requires an external DC-blocking capacitor.
Detailed Description
The MAX2027 is a high-performance, digitally controlled variable-gain amplifier for use in applications
from 50MHz to 400MHz.
The MAX2027 incorporates a digital attenuator with a
23dB selectable attenuation range followed by a fixedgain, high-linearity amplifier. The attenuator is digitally
controlled through five logic lines: B0–B4. This on-chip
attenuator provides up to 23dB of attenuation with
±0.2dB accuracy. The fixed-gain amplifier utilizes negative feedback to achieve high stability, gain, linearity,
and wide bandwidth.
Table 1. Suggested Components of
Typical Application Circuit
COMPONENT
VALUE
SIZE
C1, C3, C4, C6, C7, C10
1000pF
0603
C2, C5
100pF
0603
R1
825Ω ±1%
0603
R2–R6
47kΩ
0603
L1
330nH
0805
L2
680nH
1008
Applications Information
Input and Output Matching
The MAX2027 incorporates on-chip input and output
matching for operation below 150MHz. Use a DC-blocking capacitor value of 1000pF for pins 3, 12, and 18 (see
Figure 1). For operation above 150MHz, external matching improves performance. Table 1 and Table 2 provide
recommended components for device operation.
Digitally Controlled Attenuator
The digital attenuator is controlled through five logic
lines: B0, B1, B2, B3, and B4. Table 3 lists the attenuation settings. The input and output of this attenuator
require external DC-blocking capacitors. This attenuator insertion loss is 2dB when the attenuator is set to
0dB (B0 = B1 = B2 = B3 = B4 = 0).
8
Table 2. Suggested Matching
Components
FREQUENCY
200MHz
250MHz
300MHz
400MHz
COMPONENT
VALUE
SIZE
L3, L4
18nH
0603
C8, C9
8pF
0603
L3, L4
15nH
0603
C8, C9
8pF
0603
L3, L4
11nH
0603
C8, C9
7pF
0603
L3, L4
10nH
0603
C8, C9
5pF
0603
_______________________________________________________________________________________
IF Digitally Controlled Variable-Gain Amplifier
1
C7
C1
C2
2
20
MAX2027
19
L3*
C8*
VCC
R6
R5
C9*
L4*
RF IN
R4
R3
R2
MAX2027
VCC
3
18
4
17
5
16
6
15
ATTNOUT
C3
L1
B4
B3
CONTROL
INPUTS
B2
B1
B0
7
8
9
10
ATTENUATION
LOGIC
CONTROL
AMP
BIAS
14
13
AMPIN
IBIAS
ISET
C10
R1
12
RF OUT
C4
11
L2
VCC
C5
*FOR EXTERNAL MATCHING
C6
Figure 1. Typical Application Circuit
Fixed-Gain Amplifier
The MAX2027 integrates a fixed-gain amplifier in a negative feedback topology. This fixed-gain amplifier is
optimized for a frequency range of operation from
50MHz to 400MHz with a high-output third-order intercept point (OIP3). The bias current is chosen to optimize the IP3 of the amplifier. When R1 is 825Ω, the
current consumption is 60mA while exhibiting a typical
40dBm output IP3 at 50MHz.
Choke Inductor
The fixed-gain amplifier output port requires an external
pullup choke inductor to VCC. At the input, connect a
bias inductor of 330nH from AMPIN (pin 15) to IBIAS
(pin 14). At the output, connect a 680nH choke inductor
from RF_OUT (pin 12) to VCC (pin 11) to provide bias
current to the amplifier.
Layout Considerations
A properly designed PC board is an essential part of
any RF/microwave circuit. Keep RF signal lines as short
as possible to reduce losses, radiation, and induc-
tance. For the best performance, route the ground pin
traces directly to the exposed pad under the package.
Solder the exposed pad on the bottom of the device
package evenly to the board ground plane to provide a
heat transfer path along with RF grounding.
Power-Supply Bypassing
Proper voltage-supply bypassing is essential for highfrequency circuit stability. Bypass each VCC pin with a
1000pF and 100pF capacitor. Connect the 100pF
capacitor as close to VCC pins as possible.
Exposed Pad RF/Thermal Considerations
The exposed paddle (EP) of the MAX2027’s 20-pin
TSSOP-EP package provides a low thermal-resistance
path to the die. It is important that the PC board on
which the MAX2027 is mounted be designed to conduct heat from the EP. In addition, provide the EP with
a low-inductance path to electrical ground. The EP
should be soldered to a ground plane on the PC board,
either directly or through an array of plated via holes.
_______________________________________________________________________________________
9
MAX2027
IF Digitally Controlled Variable-Gain Amplifier
Chip Information
Table 3. Attenuation Setting vs. GainControl Bits
TRANSISTOR COUNT: 325
ATTENUATION
2dB MINIMUM
INSERTION LOSS
B4
B3*
B2
B1
B0
0
0
0
0
0
0
1
0
0
0
0
1
2
0
0
0
1
0
3
0
0
0
1
1
4
0
0
1
0
0
5
0
0
1
0
1
6
0
0
1
1
0
7
0
0
1
1
1
8
0
1
0
0
0
9
0
1
0
0
1
10
0
1
0
1
0
11
0
1
0
1
1
12
0
1
1
0
0
13
0
1
1
0
1
14
0
1
1
1
0
15
0
1
1
1
1
16
1
X
0
0
0
17
1
X
0
0
1
18
1
X
0
1
0
19
1
X
0
1
1
20
1
X
1
0
0
21
1
X
1
0
1
22
1
X
1
1
0
23
1
X
1
1
1
*Enabling B4 disables B3, and the minimum attenuation is 16dB.
10
______________________________________________________________________________________
IF Digitally Controlled Variable-Gain Amplifier
TSSOP, 4.0,EXP PADS.EPS
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 ____________________ 11
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
MAX2027
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)