IDTF1241
DATASHEET
Dual IF Digital Variable Gain Amplifier
10 – 500 MHz IDTF1241NBGI
G
ENERAL
D
ESCRIPTION
The IDTF1241 (1 dB steps) is an IF VGA for Diversity
Basestation receivers. The device offers significantly
better Noise and Distortion performance than currently
available devices. It is packaged in a compact 5x5
Thin QFN with 200 ohm differential input and output
impedances for ease of integration into the receiver
lineup.
F
EATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Ideal for systems with high SNR requirements
20 dB typical Maximum Gain
5-bit, 1 dB step, 31 dB gain control range
Excellent Noise Figure = 4.0 dB
5mm x 5mm 32 pin package
200
Differential Matched Input
200
Differential Matched Output
No termination resistors required
NF degrades just 1.3 dB @ 10 dB below Max Gain
10 MHz – 500 MHz frequency range
Ultra-Linear: IP3
O
+48 dBm typical
Excellent 2
nd
Harmonic Rejection < -80 dBc
Parallel Control
External current setting resistors
Very fast settling < 15 nsec
Individual Power Down Modes
Extremely Low Power: 80 mA / Chan
C
OMPETITIVE
A
DVANTAGE
The IDTF1241 IF VGA improves system Signal-to-Noise
Ratio (SNR), especially at lower gain settings. Via IDT’s
proprietary FlatNoise
TM
technology both IP3
O
& NF are
kept virtually flat while gain is backed
off, enhancing SNR significantly under
high level interferer conditions, and
TM
FlatNoise
TM
greatly benefiting 2G/3G/4G Multi-
Carrier IF sampling receivers.
The fast-settling gain step of 1 dB coupled with pinpoint
accuracy allow for SNR to be maximized further by
targeting the minimum necessary gain in small, accurate
increments.
See the ‘Applications Information’ section starting on
Page 17 for more details of the benefits of the F1241 in
IF sampling receivers.
A
PPLICATIONS
•
•
•
•
•
•
•
Base Station 2G, 3G, 4G, TDD radiocards
Repeaters and E911 systems
Digital Pre-Distortion
Point to Point Infrastructure
Public Safety Infrastructure
WIMAX Receivers and Transmitters
Military Systems, JTRS radios
P
ART
# M
ATRIX
Part#
F1241
Range /
Step
20 to -11
1.0
20 to -11.5
0.5
IP3
O
48
IF freq
range
10 - 500
NF
4
Pinout
Compatibility
D
EVICE
B
LOCK
D
IAGRAM
ADI
ATTN
In A
AMP
out A
F1240
47
10 - 500
4
TI (NSM)
Gain
Control
10
V
CC
O
RDERING
I
NFORMATION
Omit IDT
prefix
0.8 mm height Tape &
Reel
package
V
CC
Decode
Logic
Bias
Control
2
STBY
A
STBY
B
I
SET
IDTF1241NBGI8
RF product Line
Green
Industrial
Temp range
ATTN
In B
AMP
out B
IDT FlatNoise
TM
IF VGA
1
Rev O Nov 2012
IDTF1241
DATASHEET
Dual IF Digital Variable Gain Amplifier
10 – 500 MHz IDTF1241NBGI
A
BSOLUTE
M
AXIMUM
R
ATINGS
V
CC
to GND
GA[5:1], GB[5:1], STBY
A
, STBY
B
OUT_A-, OUT_A+, OUT_B-, OUT_B+
IN_A-, IN_A+, IN_B-, IN_B+
ISET_A, ISET_B to GND
RF Input Power (IN_A-, IN_A+, IN_B-, IN_B+) @ G
MAX
Continuous Power Dissipation
θ
JA
(Junction – Ambient)
θ
JC
(Junction – Case)
The Case is defined as the exposed paddle
Operating Temperature Range (Case Temperature)
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (soldering, 10s) .
-0.3V to +5.5V
-0.3V to (VCC_ + 0.25V)
-0.3V to (VCC_ + 0.25V)
-0.3V to +2.2V
-0.3V to +2.2V
+15 dBm
1.5W
+40°C/W
+3°C/W
T
C
= -40°C to +100°C
150°C
-65°C to +150°C
+260°C
Stresses above those listed above may cause permanent damage to the device. Functional operation of the
device at these or any other conditions above those indicated in the operational section of this specification is
not implied. Exposure to absolute maximum rating conditions for extended periods
may affect device reliability.
ESD Caution
This product features proprietary protection circuitry. However, it may be
damaged if subjected to high energy ESD. Please use proper ESD precautions
when handling to avoid damage or loss of performance.
T
RUTH
T
ABLE
Gain Set
Target
20
19
18
17
16
15
14
13
12
11
10
Gain
CodeWord
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
Code
Name
G
20
G
19
G
18
G
17
G
16
G
15
G
14
G
13
G
12
G
11
G
10
Gain Set
Target
9
8
7
6
5
4
3
2
1
0
-1
Gain
CodeWord
01010
01011
01100
01101
01110
01111
10000
10001
10010
10011
10100
Code
Name
G
9
G
8
G
7
G
6
G
5
G
4
G
3
G
2
G
1
G
0
G
-1
Gain Set
Target
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
Gain
CodeWord
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
Code
Name
G
-2
G
-3
G
-4
G
-5
G
-6
G
-7
G
-8
G
-9
G
-10
G
-11
IDT FlatNoise
TM
IF VGA
2
Rev O Nov 2012
IDTF1241
DATASHEET
Dual IF Digital Variable Gain Amplifier
10 – 500 MHz IDTF1241NBGI
IDTF1241 S
PECIFICATION
Specified values apply at V
CC
= +5.0V,
f
RF
= 200MHz,
T
C
= +25°C, STBY
A
, STBY
B
= 3.3V or NC,
R37 & R38 = 3.83K
unless otherwise
noted. EVkit transformer losses are de-embedded
Parameter
Logic Input High
Logic Input Low
Logic Current
Logic Current
Temperature
Voltage
Supply Current
Standby Current
Frequency Range
Frequency Range
1dB Gain Rolloff
Input Resistance
4
4
3
Comment
Symbol
V
IH
V
IL
min
2.0
0
-2
-10
typ
max
0.8
+2
+1
units
V
V
µA
µA
degC
GA[5:1], GB[5:1]
V
IH
= 3.45 V, V
IL
= 0V
I
IH,
I
IL
I
IH,
I
IL
T
CASE
V
CC
I
SUPP
I
STBY
f
RF
f
RF
BW
R
IN
R
OUT
G
20
or
G
MAX
G
-11
or
G
MIN
V
MODE
, STBY_A, STBY_B
V
IH
= 3.45 V, V
IL
= 0V
Operating Case Temp Range
All Supplies Operating Range
-40 to 100
4.75
5.00
159
2
50 to 400
5 to 560
400
200
200
5.25
176
5
1
V
mA
mA
MHz
MHz
MHz
Total, All V
CC
Total, All V
CC
STBY_A, STBY_B < V
IL
Low Distortion Range
IP3O > 40 dBm, Pout +3 dBm/Tone
Gain Set = G
20
Operating Range
Gain > 17 dB
With L1,L2,L3,L4 = 1500 nH
Frequency @ 1dB Gain
reduction vs. 100 MHz Gain
Differential ( > 10 dB RL)
Differential ( > 15 dB RL)
Output Resistance
Maximum Gain
Minimum Gain
18
20.2
-10.8
1.0
3
0.03
0.04
4.0
5.5
4.5
2
dB
-9
dB
dB
deg
dB
dB
dB
dB
dBm
5.8
Minimum Gain Step
Phase Error
Differential Gain Error
Integral Gain Error
Noise Figure
Noise Figure
Output IP3 -
Max Gain
Least Significant Bit
Maximum phase change
between G
MAX
and any state
down to G
-4
Between any two adjacent 1
dB steps
LSB
IPE
DNL
INL
NF
NF
BACK
IP3
O1
42
Error vs. line (G
20
Ref)
At G
20
At Gain Set = 10 dB (G
10
)
Set G
MAX,
T
AMB
= 25C
Pout = +3 dBm per tone
800 KHz Tone Separation
48
IDT FlatNoise
TM
IF VGA
3
Rev O Nov 2012
IDTF1241
DATASHEET
Dual IF Digital Variable Gain Amplifier
10 – 500 MHz IDTF1241NBGI
IDTF1241 S
PECIFICATION
(C
ONT
.)
Parameter
Output IP3 -
Mid Gain
2 Harmonic
Output IP2
1 dB Compression
Channel Isolation
Settling Time
nd
Comment
Set Gain = 10 dB (G
10
)
Pout = +3 dBm per tone
800 KHz Tone Separation
Set G
10
Pout = +3 dBm
Set G
10
800 KHz Tone Separation
Pout = +3 dBm per tone
Symbol
IP3
O2
H2
IP2
H
P1dB
O
ISO
C
T
1dB
min
typ
45.1
-82
77
max
units
dBm
dBc
dBm
dBm
dBc
nsec
Measured @ G
20
OUT_B vs. OUT_A w/ IN_A input
Measured @ G
20
for both
channels
Any two Adjacent 1dB Steps
+/-0.10 dB Pout settling
17
20.4
68
15
S
PECIFICATION
N
OTES
:
1 – Items in min/max columns in
bold italics
are Guaranteed by Test
2 – All other Items in min/max columns are Guaranteed by Design Centering
3 - STBY_A, and STBY_B both have internal pullup resistors such that they float to > V
IH
4 - Measured with 4:1 Transformers (see applications Circuit)
IDT FlatNoise
TM
IF VGA
4
Rev O Nov 2012
IDTF1241
DATASHEET
Dual IF Digital Variable Gain Amplifier
10 – 500 MHz IDTF1241NBGI
T
YPICAL
O
PERATING
C
URVES
(G
MAX
, 5.00V, T
CASE
= 25C, 200 MHz, TC4 de-embedded unless otherwise noted)
All temperatures are T
CASE
unless noted as T
AMB
or T
A
= Ambient
Gain vs. Frequency
[Gain Set = 20 dB]
25
Tcase = -40C
Tcase = +25C
Tcase = +100C
Extended Applications Range
[T
AMB
= 25C]
24
22
EVKit Alt Configuration
Replace L1,L2,L3,L4 with 1500nH
Usable BW =
10 MHz to 470 MHz
Gain 390nH
Delay 390nH
Gain 1500nH
Delay 1500nH
32
28
24
20
16
20
20
Gain (dB)
Gain (dB)
15
16
14
12
EVKit STD Configuration
L1,L2,L3,L4 = 390nH
Usable BW =
23 MHz to 535 MHz
10
12
8
4
0
1.00E+09
5
10
8
1.00E+06
0
1.00E+07
1.00E+08
1.00E+09
1.00E+07
1.00E+08
Frequency (Hz)
Frequency (Hz)
S
21
vs. Frequency
[T
CASE
= 25C]
25
20
15
S
11
vs. Frequency
[T
CASE
= 25C]
0
Gain Set = 20
Gain Set = 12
Gain Set = -11
-5
Gain Set = -4
S
21
(dB)
10
5
0
-5
Gain Set = 20
Gain Set = -4
Gain Set = 12
Gain Set = -11
S
11
(dB)
-10
-15
-20
-25
-10
-15
1.00E+07
1.00E+08
1.00E+09
-30
1.00E+07
1.00E+08
1.00E+09
Frequency (Hz)
Frequency (Hz)
S
12
vs. Frequency
[T
CASE
= 25C]
0
-5
Gain Set = 20
Gain Set = -4
Gain Set = 12
Gain Set = -11
S
22
vs. Frequency
[T
CASE
= 25C]
0
Gain Set = 20
Gain Set = 12
Gain Set = -11
Reverse Isolation [S
12
] (dB)
-5
Gain Set = -4
-10
-15
-20
-25
-30
S
22
(dB)
-10
-15
-20
-35
-40
-45
-50
1.00E+07
-25
1.00E+08
1.00E+09
-30
1.00E+07
1.00E+08
1.00E+09
Frequency (Hz)
Frequency (Hz)
IDT FlatNoise
TM
IF VGA
5
Rev O Nov 2012
Delay (nsec)
18
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