LTC6403-1 Linear Technology, LTC6403-1 Datasheet

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LTC6403-1

Manufacturer Part Number
LTC6403-1
Description
Low Power Fully Differential Input/Output Amplifier/Driver
Manufacturer
Linear Technology
Datasheet
www.DataSheet4U.com
FEATURES
APPLICATIONS
TYPICAL APPLICATION
Very Low Distortion: (2V
Fully Differential Input and Output
Low Noise: 2.8nV/√Hz Input-Referred
200MHz Gain-Bandwidth Product
Slew Rate: 200V/μs
Adjustable Output Common Mode Voltage
Rail-to-Rail Output Swing
Input Range Extends to Ground
Large Output Current: 60mA (Typ)
DC Voltage Offset <1.5mV (Max)
10.8mA Supply Current
2.7V to 5.25V Supply Voltage Range
Low Power Shutdown
Tiny 3mm × 3mm × 0.75mm 16-Pin QFN Package
Differential Input A/D Converter Driver
Single-Ended to Differential Conversion/Amplifi cation
Common Mode Level Translation
Low Voltage, Low Noise, Signal Processing
GENERATOR
SIGNAL
V
S
50Ω
Single-Ended Input to Differential Output
with Common Mode Level Shifting
0V
2V
P-P
54.9Ω
0.01μF
392Ω
422Ω
V
P-P
OCM
, 3MHz): –95dBc
+
LTC6403-1
3V
0.1μF
402Ω
402Ω
64031 TA01
1V
1V
P-P
P-P
1.5V
1.5V
Input/Output Amplifi er/Driver
Low Power Fully Differential
DESCRIPTION
The LTC
tortion, fully differential input/output amplifi er optimized
for 3V to 5V, single supply operation. The LTC6403-1 is
unity gain stable. The LTC6403-1 closed-loop bandwidth
extends from DC to 200MHz. In addition to the normal
unfi ltered outputs (+OUT and –OUT), the LTC6403-1 has a
built-in 44.2MHz differential single-pole low pass fi lter and
an additional pair of fi ltered outputs (+OUTF, and –OUTF).
An input referred voltage noise of 2.8nV/√ ⎯ H ⎯ z enables the
LTC6403-1 to drive state-of-the-art 14- to 18-bit ADCs
while operating on the same supply voltage, saving system
cost and power. The LTC6403-1 maintains its performance
for supplies as low as 2.7V. It draws only 10.8mA, and
has a hardware shutdown feature which reduces current
consumption to 170μA.
The LTC6403-1 is available in a compact 3mm × 3mm
16-pin leadless QFN 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.
®
6403-1 is a precision, very low noise, low dis-
–110
–120
–100
–30
–40
–50
–60
–70
–80
–90
1
Harmonic Distortion vs Frequency
200MHz, Low Noise,
SINGLE-ENDED INPUT
V
V
R
R
V
S
OCM
OUTDIFF
F
LOAD
= 3V
= R
= V
I
= 800Ω
= 402Ω
THIRD
ICM
= 2V
FREQUENCY (MHz)
= 1.5V
P-P
10
SECOND
LTC6403-1
64031 TA01b
100
64031f
1

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LTC6403-1 Summary of contents

Page 1

... Input/Output Amplifi er/Driver DESCRIPTION The LTC tortion, fully differential input/output amplifi er optimized for 3V to 5V, single supply operation. The LTC6403-1 is unity gain stable. The LTC6403-1 closed-loop bandwidth extends from DC to 200MHz. In addition to the normal unfi ltered outputs (+OUT and –OUT), the LTC6403-1 has a built-in 44.2MHz differential single-pole low pass fi ...

Page 2

... Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: This product is only offered in trays. For more information go to: LTC6403-1 DC ELECTRICAL CHARACTERISTICS over the full operating temperature range, otherwise specifi cations are at T Supply OPEN 402Ω ...

Page 3

... LTC6403-1 DC ELECTRICAL CHARACTERISTICS over the full operating temperature range, otherwise specifi cations are at T Supply OPEN 402Ω, R ⎯ S ⎯ H ⎯ D ⎯ – (V – defi ned as (V OUTCM +OUT defi ned as (V – INP INM SYMBOL ...

Page 4

... S ⎯ H ⎯ D ⎯ N Pull-Up Resistor R ⎯ S ⎯ H ⎯ D ⎯ Turn-On Time ON t Turn-Off Time OFF LTC6403-1 AC ELECTRICAL CHARACTERISTICS over the full operating temperature range, otherwise specifi cations are ⎯ S ⎯ H ⎯ D ⎯ OPEN 402Ω 402Ω ...

Page 5

... Note 12: A resistive load is not required when driving an AD converter with at the input common mode the LTC6403-1. Therefore, typical output power is very small. In order to compare the LTC6403-1 with amplifi ers that require 50Ω output load, the LTC6403-1 output voltage swing driving a given R ) has not OSCM were driving a 50Ω ...

Page 6

... LTC6403-1 www.DataSheet4U.com TYPICAL PERFORMANCE CHARACTERISTICS Differential Offset Voltage vs Temperature 0.8 0.6 0.4 0.2 0 –0.2 V –0.4 V OCM V ICM –0 FIVE TYPICAL UNITS –0.8 –60 –40 – TEMPERATURE (°C) Supply Current vs ⎯ S ⎯ H ⎯ D ⎯ N Voltage –40° 25° 85°C ...

Page 7

... Differential Slew Rate vs Temperature 220 210 200 190 180 170 –60 –40 – 1000 TEMPERATURE (°C) 64031 G19 LTC6403-1 Harmonic Distortion vs Frequency –30 SINGLE-ENDED INPUT – 1.5V OCM ICM 402Ω – 800Ω LOAD –60 ...

Page 8

... S ⎯ H ⎯ D ⎯ N (Pin 1): When ⎯ S ⎯ H ⎯ D ⎯ fl oating or directly tied to V the LTC6403 the normal (active) operating mode. When Pin 1 is pulled a minimum of 2.1V below V LTC6403-1 enters into a low power shutdown state. See Applications Information for more details. + – ...

Page 9

... The V overdriven by an external voltage reference capable of driving the input impedance presented by the V On the LTC6403-1, the V pin has an input resistance OCM of approximately 23k to a mid-supply potential. The V pin should be bypassed with a high quality ceramic bypass capacitor of at least 0.01μ ...

Page 10

... OUTCM + 0.1μF 10 – V – 0.1μ BAL – 0.1μF 64031 F01 I L 0.1μF 340Ω 140Ω LTC6403-1 – V MINI-CIRCUITS – TCM4-19 0.1μF – 0.1μ 0.1μF 10 – V – 0.1μF V – 0.1μF 64031 F02 0.1μ ...

Page 11

... The LTC6403-1 can be used as a single ended input to differential output amplifi er differential input to differential output amplifi er. ...

Page 12

... This makes the LTC6403-1 ideally suited for pre-amplifi cation, level shifting and conversion of single-ended input signals to differential output signals in preparation for driving dif- ferential input ADCs. Effects of Resistor Pair Mismatch Figure 3 shows a circuit diagram with takes into consid- eration that real world resistors will not perfectly match ...

Page 13

... V ≈ (V – V OSDIFF(APPARENT) INCM Using the LTC6403 single supply application on a single 5V supply with 1% resistors, and the input common mode grounded, with the V OCM the worst case mismatch can induce 25mV of apparent offset voltage. With 0.1% resistors, the worst case appar- ent offset reduces to 2 ...

Page 14

... V +OUTF V +OUT ratio. To simplify this fi ltering, the LTC6403-1 includes an additional pair of differential outputs (+OUTF and –OUTF) which incorporate an internal lowpass fi lter network with a –3dB bandwidth of 44.2MHz (Figure 6). to zero), the input common voltage is INM ⎛ ...

Page 15

... Keep in mind, the series resistance also serves to decouple the outputs from load capacitance. The unfi ltered outputs of the LTC6403-1 are designed to drive 10pF to ground or 5pF differentially, so care should be taken to not lower the effective impedance between +OUT and +OUTF or –OUT and – ...

Page 16

... ⎝ ⎠ plot of this equation, and a plot of the noise generated by the feedback components for the LTC6403-1 is shown in Figure 10 – ncm 16 The LTC6403-1’s input referred voltage noise contributes the equivalent noise of a 480Ω resistor. When the feedback network is comprised of resistors whose values are less than this, the LTC6403-1’ ...

Page 17

... Layout Considerations Because the LTC6403 very high speed amplifi er sensitive to both stray capacitance and stray inductance. Three pairs of power supply pins are provided to keep the power supply inductance as low as possible to prevent any degradation of amplifi ...

Page 18

... ADC (Figure 11 shows an example of this place a discrete R-C fi lter network between the differential unfi l- tered outputs of the LTC6403-1 and the input of the ADC 402Ω ...

Page 19

... LTC DWG # 05-08-1691) 0.70 ±0.05 PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 0.75 ± 0.05 3.00 ± 0.10 (4 SIDES) PIN 1 TOP MARK (NOTE 6) 1.45 ± 0.10 (4-SIDES) 0.200 REF 0.00 – 0.05 LTC6403-1 BOTTOM VIEW—EXPOSED PAD PIN 1 NOTCH R = 0.20 TYP R = 0.115 OR 0.25 × 45° CHAMFER TYP 15 16 0.40 ± 0. (UD16) QFN 0904 0.25 ± 0.05 0.50 BSC 64031f 19 ...

Page 20

... LTC6403-1 www.DataSheet4U.com RELATED PARTS PART NUMBER DESCRIPTION High-Speed Differential Amplifi ers/Differential Op Amps LT1994 Low Noise, Low Distortion Differential Op Amp LT5514 Ultralow Distortion IF Amplifi er/ADC Driver with Digitally Controlled Gain LT5524 Low Distortion IF Amplifi er/ADC Driver with Digitally Controlled Gain LTC6401-20 1 ...

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