LTC6605-7
1
66057f
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Dual Matched 7MHz Filter
with Low Noise, Low Distortion
Differential Amplifi er
The LTC
®
6605-7 contains two independent, fully differen-
tial amplifi ers confi gured as matched 2nd order lowpass
fi lters. The f
–3dB
of the fi lters is adjustable in the range of
6.5MHz to 10MHz.
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 amplifi er 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) 7MHz
2nd order fi lter response. A single optional external re-
sistor per channel can tailor the frequency response for
each amplifi er.
Three-state BIAS pins determine each amplifi er’s power
consumption, allowing a choice between shutdown, me-
dium power or full power.
The LTC6605-7 is available in a compact 6mm × 3mm
22-pin leadless DFN package and operates over a –40°C
to 85°C temperature range.
Dual, Matched 6.5MHz Lowpass Filter
n
Two Matched 7MHz 2nd Order Lowpass Filters with
Differential Amplifi ers
Gain Match: ±0.35dB Max, Passband
Phase Match: ±1.2° Max, Passband
Single-Ended or Differential Inputs
n
< –90dBc Distortion in Passband
n
2.1nV/√Hz Op Amp Noise Density
n
Pin-Selectable Gain (0dB/12dB/14dB)
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
n
WCDMA ADC Driver/Filter
n
Antialiasing Filter
n
Single-Ended to Differential Conversion
n
DAC Smoothing Filter
n
Zero-IF Direct Conversion Receivers
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Channel to Channel Phase Matching
66057 TA01
LTC6605-7
3V
0.1μF
0.1μF
0.1μF
0.1μF
–
+
21
19
17
V
OUTA
+
–
22
18
3V
–
+
15
14
13
16
12
2
3
4
6
V
OUTB
+
–
1
5
8
9
10
7
11
20
V
INA
3V
+
–
V
INB
3V
+
–
PHASE MATCH (DEG)
–1.2
NUMBER OF UNITS
0
20
120
60
–0.8
0 0.4 0.8 1.2
66057 TA01b
80
100
40
–0.4
292 TYPICAL UNITS
T
A
= 25°C
f
IN
= 7MHz