LTC6605-10 Linear Technology, LTC6605-10 Datasheet

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LTC6605-10

Manufacturer Part Number
LTC6605-10
Description
Dual Matched 10MHz Filter
Manufacturer
Linear Technology
Datasheet
FEATURES
APPLICATIONS
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TYPICAL APPLICATION
Two Matched 10MHz 2nd Order Lowpass Filters
with Differential Amplifi ers
< –90dBc Distortion in Passband
2.1nV/√Hz Op Amp Noise Density
Pin-Selectable Gain (0dB/12dB/14dB)
Pin-Selectable Power Consumption (0.35mA/
16.2mA/33.1mA)
Rail-to-Rail Output Swing
2.7V to 5.25V Supply Voltage
Small 22-Pin 6mm × 3mm × 0.75mm DFN Package
Broadband Wireless ADC Driver/Filter
Antialiasing Filter
Single-Ended to Differential Conversion
DAC Smoothing Filter
Zero-IF Direct Conversion Receivers
V
V
INA
INB
+
+
Gain Match: ±0.35dB Max, Passband
Phase Match: ±1.2° Max, Passband
Single-Ended or Differential Inputs
Adjustable Output Common Mode Voltage Control
Buffered, Low Impedance Outputs
3V
3V
Dual, Matched 9.7MHz Lowpass Filter
10
11
1
2
3
4
5
6
7
8
9
+
+
LTC6605-10
22
21
20
19
18
17
16
15
14
13
12
660510 TA01
0.1μF
0.1μF
0.1μF
0.1μF
3V
3V
V
V
OUTA
OUTB
+
+
with Low Noise, Low Distortion
Dual Matched 10MHz Filter
DESCRIPTION
The LTC
ential amplifi ers confi gured as matched 2nd order 10MHz
lowpass fi lters. The f
range of 9.7MHz to 14MHz.
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) 10MHz
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 LTC6605-10 is available in a compact 6mm × 3mm
22-pin leadless DFN package and operates over a –40°C
to 85°C temperature range.
All other trademarks are the property of their respective owners.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
®
6605-10 contains two independent, fully differ-
120
100
80
60
40
20
0
Channel to Channel Phase Matching
Differential Amplifi er
–1.0
352 TYPICAL UNITS
T
f
IN
A
= 25°C
= 10MHz
–0.8
–0.6
–3dB
–0.4
PHASE MATCH (DEG)
–0.2
of the fi lters is adjustable in the
0
0.2
LTC6605-10
www.DataSheet4U.com
0.4
0.6 0.8
660510 TA01b
1.0
660510f
1

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LTC6605-10 Summary of contents

Page 1

... Three-state BIAS pins determine each amplifi er’s power consumption, allowing a choice between shutdown, me- dium power or full power. The LTC6605-10 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. ...

Page 2

... LTC6605-10 ABSOLUTE MAXIMUM RATINGS (Note 1) + – Total Supply Voltage ( ................................5.5V Input Current (Note 2) ..........................................±10mA Output Short-Circuit Duration (Note 3) ............ Indefi nite Operating Temperature Range (Note 4).... –40°C to 85°C Specifi ed Temperature Range (Note 5) .... –40°C to 85°C Junction Temperature ........................................... 150°C Storage Temperature Range ................... – ...

Page 3

... Referenced to V – – 3V BIAS + – 3V BIAS LTC6605-10 www.DataSheet4U.com = V = mid-supply, BIAS tied to V INCM OCM + – – defi ned as (V OUTCM ). V is defi ned as (V – See Figure 1. INDIFF INP INM MIN ...

Page 4

... Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: All pins are protected by steering diodes to either supply. If any pin is driven beyond the LTC6605-10’s supply voltage, the excess input current (current in excess of what it takes to drive that pin to the supply rail) should be limited to less than 10mA. ...

Page 5

... G01 Filter Frequency Response 1.5V INCM OCM –10 –20 –30 –40 –50 0 100 660510 G03 LTC6605-10 www.DataSheet4U.com ) has not deviated by OSCM ). 3V, BIAS = MID-SUPPLY INCM OCM 5 RANDOM UNITS –40 – ...

Page 6

... LTC6605-10 TYPICAL PERFORMANCE CHARACTERISTICS Harmonic Distortion vs Frequency, BIAS High –40 DIFFERENTIAL INPUTS, HD2 DIFFERENTIAL INPUTS, HD3 –50 SINGLE-ENDED INPUTS, HD2 SINGLE-ENDED INPUTS, HD3 –60 –70 –80 –90 –100 –110 –120 1 10 100 FREQUENCY (MHz) 660510 G05 P 400Ω DIFFERENTIAL, GAIN = 1V/V ...

Page 7

... Figure 1. DC Test Circuit (Channel A Shown) 81.5pF 400Ω 48.2pF 125Ω + – BIAS – + 48.2pF 125Ω 400Ω 81.5pF Figure 2. AC Test Circuit (Channel A Shown) LTC6605-10 www.DataSheet4U.com 25Ω –OUT 0.1μF BAL 0.1μF – 20 ...

Page 8

... LTC6605-10 PIN FUNCTIONS +IN4 A, –IN4 A, +IN4 B, –IN4 B (Pins 11): Inputs to Trimmed 400Ω Resistors. Can accept an input signal, be fl oated, tied to an output pin, or connected to external components. +IN1 A, –IN1 A, +IN1 B, –IN1 B (Pins 10): Inputs to Trimmed 100Ω Resistors. Can accept an input signal, be fl ...

Page 9

... BIAS + – 48.2pF 100Ω 125Ω 400Ω 400Ω 81.5pF LTC6605-10 www.DataSheet4U.com –OUT – 36k 19 V OCMA 36k – ...

Page 10

... The LTC6605-10 can be operated with a single-ended input and differential output, or with a differential input and differential output. ...

Page 11

... R1 to confi gure GAIN ≠ 1. For an even more fl exible fi lter IC with similar performance, consider the LTC6601. BIAS Pin Each channel of the LTC6605-10 has a BIAS pin whose is O function is to tailor both performance and power. The BIAS pin can be modeled as a voltage source whose potential is 1 ...

Page 12

... LTC6605-10 APPLICATIONS INFORMATION – – 660510 F04a f = 9.7MHz –3dB GAIN = 1V/ V (0dB 800Ω IN Gain Response –10 –20 –30 –40 –50 0 100 1000 FREQUENCY (MHz) 660510 G04d Phase and Group Delay Response 0 –20 – ...

Page 13

... FREQUENCY (MHz) 660510 G05e 25 20 GROUP DELAY 15 100mV/DIV 100 1000 660510 G05i LTC6605-10 www.DataSheet4U.com 1 22 44.2Ω 44.2Ω 4 – 44.2Ω 44.2Ω 10 – 660510 F05c ±0.7dB 11.2MHz PASSBAND GAIN = 3.774V/ V (11.5dB 212Ω ...

Page 14

... LTC6605-10 APPLICATIONS INFORMATION Input Impedance Calculating the low frequency input impedance depends on how the inputs are driven. Figure 6 shows a simplifi ed low frequency equivalent circuit. For balanced input sources (V low frequency input impedance is given by the equation INP INM Therefore, the differential input impedance is simply • ...

Page 15

... When comparing the LTC6605-10’s noise to that of other amplifi ers, be sure to compare similar specifi - cations. Standalone op amps often specify noise re- ferred to the inputs of the op amp. The LTC6605-10’s internal op amp has input referred voltage noise of only 2.1nV/√Hz. In addition to the noise generated by 2 ⎡ ...

Page 16

... Floating unused pins does not reduce the reliability of the part the output, always keep in mind the differential nature of the LTC6605-10, because it is important that the load impedances seen by both outputs (stray or intended balanced and symmetric as possible. This will help pre- – ...

Page 17

... ADC, but the following guidelines are recom- mended. Choose an RC time constant that is smaller than the reciprocal of the fi lter cutoff frequency confi gured by the LTC6605-10. Time constants on the order of 2ns do a good job of fi ltering broadband noise. Longer time constants 1/2 LTC6605-10 ...

Page 18

... LTC6605-10 TYPICAL APPLICATIONS V INA V INB THREE GAINS ARE POSSIBLE, AS SHOWN IN FIGURE 4 18 Dual, Matched, 4th Order 10MHz Lowpass Filter LTC6605-10 LTC6605- 182Ω – – 182Ω – – Gain Magnitude vs Frequency ...

Page 19

... BSC 0.10 TYP 3.00 ±0.10 1.65 ± 0.10 (2 SIDES) (2 SIDES) 11 0.75 ±0.05 0.00 – 0.05 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON TOP AND BOTTOM OF PACKAGE LTC6605-10 www.DataSheet4U.com R = 0.115 0.40 ± 0.05 TYP 0.889 22 0.889 PIN #1 NOTCH R0.30 TYP OR 1 0.25mm × 45° 0.25 ± 0.05 CHAMFER 0.50 BSC 5.35 ± ...

Page 20

... Differential Pin-Confi gurable 2nd Order Filter Building Block LT6604-2.5/LT6604-5 Dual Differential 4th Order Lowpass Filters Linear Technology Corporation 20 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● Dual Matched, 3rd Order 7.5MHz Lowpass Filter LTC6605-10 301Ω 270pF 1% 4 – ...

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