ltc6401-8 Linear Technology Corporation, ltc6401-8 Datasheet

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ltc6401-8

Manufacturer Part Number
ltc6401-8
Description
2.2ghz Low Noise, Low Distortion Differential Adc Driver For Dc-140mhz
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
APPLICATIONS
TYPICAL APPLICATION
0.1μF
C2
V
2.2GHz –3dB Bandwidth
Fixed Gain of 2.5V/V (8dB)
–92dBc IMD3 at 70MHz (Equivalent OIP3 = 50dBm)
–80.5dBc IMD3 at 140MHz (Equivalent OIP3 = 44dBm)
1nV/√ ⎯ H ⎯ z Internal Op Amp Noise
12.1dB Noise Figure
Differential Inputs and Outputs
400Ω Input Impedance
2.85V to 3.5V Supply Voltage
45mA Supply Current (135mW)
1V to 1.6V Output Common Mode, Adjustable
DC- or AC-Coupled Operation
Max Differential Output Swing 4.6V
Small 16-Lead 3mm × 3mm × 0.75mm QFN Package
Differential ADC Driver
Differential Driver/Receiver
Single Ended to Differential Conversion
IF Sampling Receivers
SAW Filter Interfacing
IN
59.0Ω
R1
27.4Ω
1000pF
R2
C1
0.1μF
0.1μF
C3
C4
3.3V
+IN
–IN
V
+
V –
LTC6401-8
V
OCM
+OUT
–OUT
1.25V
C5
0.1μF
COILCRAFT
0603CS
P-P
100Ω
15Ω
15Ω
R
R
R3
S1
S2
24nH
L1
C
33pF
C
33pF
C
33pF
F2
F1
F3
10Ω
10Ω
R
R
S3
S4
DESCRIPTION
The LTC
geted at processing signals from DC to 140MHz. The part
has been specifi cally designed to drive 12-, 14- and 16-bit
ADCs with low noise and low distortion, but can also be
used as a general-purpose broadband gain block.
The LTC6401-8 is easy to use, with minimal support cir-
cuitry required. The output common mode voltage is set
using an external pin, independent of the inputs, which
eliminates the need for transformers or AC-coupling ca-
pacitors in many applications. The gain is internally fi xed
at 8dB (2.5V/V).
The LTC6401-8 saves space and power compared to al-
ternative solutions using IF gain blocks and transformers.
The LTC6401-8 is packaged in a compact 16-lead 3mm ×
3mm QFN package and operates over the –40°C to 85°C
temperature range.
All other trademarks are the property of their respective owners.
16-Bit ADC
LTC2208
130Msps
Distortion Differential ADC
AIN
AIN
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
+
LTC2208
3.3V
V
V
2.2GHz Low Noise, Low
DD
CM
®
6401-8 is a high-speed differential amplifi er tar-
64018 TA01a
Driver for DC-140MHz
60
50
40
30
20
10
0
Equivalent Output IP3 vs Frequency
0
20 40 60 80
FREQUENCY (MHz)
LTC6401-8
100 120 140 160 180
(NOTE 7)
64018 TA01b
64018f
1
200

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ltc6401-8 Summary of contents

Page 1

... ADCs with low noise and low distortion, but can also be used as a general-purpose broadband gain block. The LTC6401-8 is easy to use, with minimal support cir- cuitry required. The output common mode voltage is set using an external pin, independent of the inputs, which eliminates the need for transformers or AC-coupling ca- pacitors in many applications. The gain is internally 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: For more information on tape and reel specifi cations, go to: LTC6400 AND LTC6401 SELECTOR GUIDE PART NUMBER GAIN (dB) LTC6401-8 LTC6401-20 20 LTC6401-26 26 LTC6400-20 20 ...

Page 3

... E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 2.4V ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0.8V, Input and Output Floating ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 2.4V, Input and Output Floating + V = 2.85V to 3.5V LTC6401-8 = 1.25V, ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0V unless OCM L MIN TYP ...

Page 4

... LTC6401-8 AC ELECTRICAL CHARACTERISTICS ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0V unless otherwise noted. L SYMBOL PARAMETER –3dBBW –3dB Bandwidth 0.5dBBW Bandwidth for 0.5dB Flatness 0.1dBBW Bandwidth for 0.1dB Flatness 1/f 1/f Noise Corner SR Slew Rate t 1% Settling Time S1% t Overdrive Recovery Time OVDR ...

Page 5

... Note 5: Input and output baluns used. See Test Circuit A. Note 6: Measured using Test Circuit B. R Note 7: Since the LTC6401 feedback amplifi er with low output impedance, a resistive load is not required when driving an AD converter. Therefore, typical output power is very small. In order to compare the LTC6401-8 with amplifi ...

Page 6

... LTC6401-8 TYPICAL PERFORMANCE CHARACTERISTICS Input and Output Refl ection and Reverse Isolation vs Frequency 0 TEST CIRCUIT B –10 –20 S11 –30 S22 –40 –50 –60 S12 –70 –80 10 100 1000 3000 FREQUENCY (MHz) 64018 G04 Noise Figure and Input Referred Noise Voltage vs Frequency ...

Page 7

... ENABLE –10 –0.5 300 400 500 –100 64018 G18 LTC6401-8 Third Order Intermodulation Distortion vs Frequency –40 SINGLE-ENDED INPUT COMPOSITE OUT P-P –50 –60 200Ω R –70 L –80 – –100 L L –110 200 ...

Page 8

... LTC6401-8 PIN FUNCTIONS + V (Pins 1, 3, 10): Positive Power Supply (Normally tied 3.3V). All three pins must be tied to the same voltage. Bypass each pin with 1000pF and 0.1μF capaci- tors as close to the pins as possible. V (Pin 2): This pin sets the output common mode OCM voltage. A 0.1μ ...

Page 9

... Moreover, they offer single-ended 50Ω matching in wideband applications and no external resistor is needed. The LTC6401-8 is very fl exible in terms of I/O coupling. It can be AC- or DC-coupled at the inputs, the outputs or both. Due to the internal connection between input and output, users are advised to keep input common mode voltage between 1V and 1 ...

Page 10

... Figure 5. A bandpass fi lter is easily implemented with 200Ω 13 +IN 14 +IN 15 –IN L 200Ω 16 –IN Figure 5. LTC6401-8 Internal Filter Topology Modifi ed for Low Filter Bandwidth (Three External Capacitors) LTC6401-8 200Ω 500Ω 12.5Ω 13 +IN +OUT 50Ω IN+ OUT– ...

Page 11

... LTC6401-8. Figure 8 summarizes the IMD3 performance of the whole system as shown in Figure 7. OCM control is OCM pin should OCM Figure 8. IMD3 for the Combination of LTC6401-8 and LTC2208 LTC6401-8 1.25V 0.1μF 0.1μF V OCM 4.99Ω – ...

Page 12

... LTC6401-8 APPLICATIONS INFORMATION Test Circuits Due to the fully-differential design of the LTC6401 and its usefulness in applications with differing characteristic specifi cations, two test circuits are used to generate the information in this datasheet. Test Circuit A is DC987B, a two-port demonstration circuit for the LTC6401 family. ...

Page 13

... C10 C9 C12 0.1μF 1000pF 1000pF C7 0.1μF C23 C5 0.1μF 0.1μF R21 R22 (1) (1) C24 C6 0.1μF 0.1μ LTC6401CUD-8 200Ω 200Ω MINI-CIRCUITS TCM4-19 (1:4) LTC6401-8 C18 0.1μF R10 R14 86.6Ω (1) R12 TCM 4: (1) 0.1μF 1:4 2 SL2 R7 R11 (2) ( 0.1μF 86.6Ω ...

Page 14

... LTC6401-8 TYPICAL APPLICATIONS PORT 1 (50Ω) 0.1μF 1/2 AGILENT 133Ω E5O71A PORT 2 (50Ω) 0.1μF 14 Test Circuit B, 4-Port Analysis + V 1000pF 0.1μF V – + ENABLE BIAS CONTROL OUT +IN 500Ω 200Ω 12.5Ω FILT 50Ω +IN IN+ OUT– ...

Page 15

... Plastic QFN (3mm × 3mm) (Reference LTC DWG # 05-08-1691) 0.70 ±0.05 PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 0.75 ± 0.05 (4 SIDES) 1.45 ± 0.10 (4-SIDES) 0.200 REF 0.00 – 0.05 LTC6401-8 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 ...

Page 16

... LTC6401-8 RELATED PARTS PART NUMBER DESCRIPTION High-Speed Differential Amplifi ers/Differential Op Amps LT ® 1993-2 800MHz Differential Amplifi er/ADC Driver LT1993-4 900MHz Differential Amplifi er/ADC Driver LT1993-10 700MHz Differential Amplifi er/ADC Driver LT1994 Low Noise, Low Distortion Differential Op Amp LT5514 Ultralow Distortion IF Amplifi ...

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