IDTF1240NBGI Datasheet, PDF (1/23 Pages) Integrated Device Technology – Dual Intermediate Frequency Digital Variable Gain Amplifier

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 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 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: IP3_O +47 dBm typical
• Excellent 2^nd 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#
Range /
Step
IP3O
IF freq
range
NF
20 to -11.5
F1240
0.5
47 10 - 500 4
F1241
20 to -11
1.0
47 10 - 500 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
V_DD
V_MODE
Decode
Logic
ATTN
In B
AMP
out A
Bias
Control
V_CC
STBYA
STBYB
2
ISET
AMP
out B
IDT FlatNoise^TM IF VGA
1
Rev O Mar 2012