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PDF IDTF1240NBGI Data sheet ( Hoja de datos )
| Número de pieza | IDTF1240NBGI | |
| Descripción | Dual Intermediate Frequency Digital Variable Gain Amplifier | |
| Fabricantes | Integrated Device Technology | |
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DATASHEET
Dual Intermediate Frequency Digital Variable Gain Amplifier
IDTF1240NBGI
GENERAL DESCRIPTION
The IDTF1240 (0.5 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.
COMPETITIVE ADVANTAGE
The IDTF1240 IF VGA improves system SNR, especially
at lower gain settings. Via IDT’s proprietary FlatNoiseTM
technology both IP3O & NF are kept virtually flat
while gain is backed off, enhancing SNR significantly
under high level interferer conditions, and greatly
benefiting 2G/3G/4G Multi-Carrier IF sampling receivers.
The fast-settling, parallel mode gain step of 0.50 dB
coupled with the excellent differential non-linearity allow
for SNR to be maximized further by targeting the
minimum necessary gain in small, accurate increments.
The matched output does not require a terminating
resistor, thus the gain and distortion performance are
preserved when driving Bandpass Anti-Alias filters.
See the ‘Applications Information’ section starting on
Page 19 for more details of the benefits of the F1240 in
IF sampling receivers.
FEATURES
• Ideal for systems with high SNR requirements
• 20 dB typical Maximum Gain
• 31.5 dB gain control range
• 6 bit control
• 0.50 dB Gain Steps
• Excellent Noise Figure = 4.0 dB
• 5mm x 5mm 32 pin package
• 200 Ω Differential Matched Input
• 200 Ω 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: IP3O +47 dBm typical
• Excellent 2nd Harmonic Rejection
• Selectable Parallel or Serial Control
• External current setting resistors
• Very fast settling < 15 nsec
• Individual Power Down Modes
• Extremely Low Power: 80 mA / Chan
DEVICE BLOCK DIAGRAM
PART# MATRIX
Part#
F1240
F1241
Range /
Step
20 to -11.5
0.5
20 to -11
1.0
IP3O
IF freq
range
47 10 - 500
47 10 - 500
NF
4
4
Pinout
Compatibility
NSM
ADI
ORDERING INFORMATION
Omit IDT
prefix
0.8 mm height Tape &
package
Reel
IDTF1240NBGI8
RF product Line
Green
Industrial
Temp range
ATTN
In A
Gain 12
Control
SPI
VDD
VMODE
Decode
Logic
ATTN
In B
AMP
out A
Bias
Control
VCC
STBYA
STBYB
2 ISET
AMP
out B
IDT FlatNoiseTM IF VGA
1
Rev O Mar 2012
1 page  
DATASHEET
Dual Intermediate Frequency Digital Variable Gain Amplifier
IDTF1240NBGI
SERIAL MODE
Serial mode is selected by grounding VMODE (pin4) or pulling it to a voltage < VIL. In serial mode the IDTF1240
Ch_A and Ch_B gains can be programmed independently via the serial port by asserting Chip Select (CSb).
SERIAL MODE TIMING DIAGRAM HIGH LEVEL:
CLK
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Data Word
Latched into
Register
CS
DATA
Address Word A7 – A0
Data Word D7 – D0
00
0 00 0
0 00 = A
1=B
1 = On
0 = Off
16 dB
8 dB
4 dB
2 dB 1 dB
0.5 dB
RSV RSV RSV RSV RSV RSV RSV CH
EN G5 G4
MSB
1 = 16 dB
ATTN
G3 G2
G1 G0 RSV
LSB
SERIAL MODE TIMING DIAGRAM ZOOM:
DATA
CLK
Ts
TH
A7
A6
CS
TEN
IDT FlatNoiseTM IF VGA
5
Rev O Mar 2012
5 Page 
DATASHEET
Dual Intermediate Frequency Digital Variable Gain Amplifier
TOCS CONTINUED (-5-)
IDTF1240NBGI
Output IP3 vs. TCASE [200 MHz]
55
50
45
40
35 -40 degC - 2.0E+08 Hz - 5.00 V
25 degC - 2.0E+08 Hz - 5.00 V
30 100 degC - 2.0E+08 Hz - 5.00 V
25
20
20 16 12
8
4
0
-4
Gain Setting (dB)
Output IP3 vs. Pout [TAMB = 25C, Gain Set = 20 dB]
55
50
45
40
35
200 MHz
30
150 MHz
25
20
-4 -3 -2 -1 0 1 2 3 4 5
Output Power (dBm/Tone)
2nd Harmonic vs. TCASE [250 MHz]
-20
-30
-40 degC - 5.00 V
-40
25 degC - 5.00 V
-50 100 degC - 5.00 V
-60
-70
-80
-90
-100
20
16 12
8
4
Gain Setting (dB)
0
6
-4
Output IP3 vs. VCC [200 MHz]
55
50
45
40
35 25 degC - 5.25 V
25 degC - 5.00 V
30 25 degC - 4.75 V
25
20
20
16 12
8
4
Gain Setting (dB)
2nd Harmonic vs. TCASE [200 MHz]
-20
0
-30
-40 degC - 5.00 V
-40
25 degC - 5.00 V
-50 100 degC - 5.00 V
-60
-70
-80
-90
-100
20
16 12
8
4
Gain Setting (dB)
0
Output IP2 vs. TCASE [200 MHz]
95
90
85
80
75
70
65
60
55
50
20
-40 degC - 5.00 V
25 degC - 5.00 V
100 degC - 5.00 V
16 12
8
4
Gain Setting (dB)
0
-4
-4
-4
IDT FlatNoiseTM IF VGA
11
Rev O Mar 2012
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet IDTF1240NBGI.PDF ] | |
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