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LTC6605-14 fiches techniques PDF

Linear Technology - Dual Matched 14MHz Filter

Numéro de référence LTC6605-14
Description Dual Matched 14MHz Filter
Fabricant Linear Technology 
Logo Linear Technology 





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LTC6605-14 fiche technique
LTC6605-14www.DataSheet4U.com
Dual Matched 14MHz Filter
with Low Noise, Low Distortion
Differential Amplifier
FEATURES
DESCRIPTION
n Two Matched 14MHz 2nd Order Lowpass Filters
with Differential Amplifiers
Gain Match: ±0.25dB Max, Passband
Phase Match: ±1.1° Max, Passband
Single-Ended or Differential Inputs
n < –84dBc Distortion in Passband
n 2.1nV/√Hz Op Amp Noise Density
n Pin-Selectable Gain (0dB/6dB/9.5dB)
n Pin-Selectable Power Consumption (0.35mA/
16.2mA/33.1mA)
n Rail-to-Rail Output Swing
Adjustable Output Common Mode Voltage Control
Buffered, Low Impedance Outputs
n 2.7V to 5.25V Supply Voltage
n Small 22-Pin 6mm × 3mm × 0.75mm DFN Package
APPLICATIONS
n Broadband Wireless ADC Driver/Filter
n Antialiasing Filter
n Single-Ended to Differential Conversion
n DAC Smoothing Filter
n Zero-IF Direct Conversion Receivers
The LTC®6605-14 contains two independent, fully differ-
ential amplifiers configured as matched 2nd order 14MHz
lowpass filters. The f–3dB of the filters is adjustable in the
range of 12.4MHz to 20MHz and 25MHz.
The internal op amps are fully differential, feature very
low noise and distortion, and are compatible with 16-bit
dynamic range systems. The inputs can accept single-
ended or differential signals. An input pin is provided
for each amplifier to set the common mode level of the
differential outputs.
Internal laser-trimmed resistors and capacitors determine
a precise, very well matched (in gain and phase) 14MHz
2nd order filter response. A single optional external re-
sistor per channel can tailor the frequency response for
each amplifier.
Three-state BIAS pins determine each amplifier’s power
consumption, allowing a choice between shutdown, me-
dium power or full power.
The LTC6605-14 is available in a compact 6mm × 3mm
22-pin leadless DFN package and operates over a –40°C
to 85°C temperature range.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Dual, Matched 12.4MHz Lowpass Filter
+
VINA 3V
+
VINB 3V
1
2+
3
4
5
6 LTC6605-14
7
8+
9
10
11
22
21 3V
0.1μF
20
0.1μF
19
18
17
16
15 3V
0.1μF
14
0.1μF
13
12
660514 TA01
VOUTA
+
VOUTB
+
Channel to Channel Phase Matching
160
354 TYPICAL UNITS
140 TA = 25°
fIN = 14MHz
120
100
80
60
40
20
0
–1.0
–0.6 –0.2 0 0.2 0.6
PHASE MATCH (DEG)
1.0
66057 TA01b
660514f
1

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