LTC6401-14 Linear Technology, LTC6401-14 Datasheet
LTC6401-14
Related parts for LTC6401-14
LTC6401-14 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 LTC6401-14 is easy to use, with minimal support circuitry 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 LTC6401-8 LTC6401-14 LTC6401-20 LTC6401-26 LTC6400-8 LTC6400-14 LTC6400-20 LTC6400-26 In addition to the LTC6401 family of amplifi ...
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 LTC6401-14 = 1.25V, ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0V unless OCM L MIN TYP ...
Page 4
... LTC6401-14 www.DataSheet4U.com 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 ...
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 LTC6401-14 with amplifi ...
Page 6
... LTC6401-14 www.DataSheet4U.com 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 FREQUENCY (MHz) Noise Figure and Input Referred Noise Voltage vs Frequency ...
Page 7
... +OUT 20 –OUT 10 0 ENABLE –10 100 200 300 400 TIME (ns) 640114 G18 LTC6401-14 Third Order Intermodulation Distortion vs Frequency –40 SINGLE-ENDED INPUT COMPOSITE OUT P-P –50 –60 200Ω R –70 –80 –90 HD2 HD2 200Ω –100 ...
Page 8
... LTC6401-14 www.DataSheet4U.com 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 LTC6401-14 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 13 + – –IN Figure 5. LTC6401-14 Internal Filter Topology Modifi ed for Low Filter Bandwidth (Three External Capacitors) LTC6401-14 1/2 R 100Ω 500Ω 12.5Ω +IN 50Ω IN+ OUT– ...
Page 11
... LTC6401-14. 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 LTC6401-14 and LTC2208 LTC6401-14 1.25V 0.1μF 0.1μF V OCM 4.99Ω – ...
Page 12
... LTC6401-14 www.DataSheet4U.com 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
... R19 1.5k R20 C7 1k 0.1μF C23 C5 C19 0.1μF 0.1μF 0.1μF R21 (1) C24 C6 0.1μF 0.1μF (2) VERSION LTC6401CUD-14 MINI-CIRCUITS TCM4-19 (1: SIGNAL LEVEL LTC6401-14 C17 C18 1000pF 0.1μ – R10 86.6Ω TCM 4:19 3 (1) 0.1μF 7 1:4 2 SL2 R7 (2) ( 0.1μ ...
Page 14
... LTC6401-14 www.DataSheet4U.com TYPICAL APPLICATIONS PORT 1 (50Ω) 1/2 AGILENT 200Ω E5O71A PORT 2 (50Ω) 14 Test Circuit B, 4-Port Analysis + V 1000pF 0.1μF V – + ENABLE BIAS CONTROL OUT +IN 500Ω 100Ω 12.5Ω 0.1μF FILT 50Ω +IN IN+ OUT– ...
Page 15
... 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 LTC6401-14 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 640114f 15 ...
Page 16
... LTC6401-14 www.DataSheet4U.com 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 ...