Datasheet

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LT1395/LT1396/LT1397

139567fd

TYPICAL APPLICATION

DESCRIPTION

Single/Dual/Quad 400MHz

Current Feedback Ampliﬁ er

The LT

1395/LT1396/LT1397 are single/dual/quad 400MHz

current feedback ampliﬁ ers with an 800V/μs slew rate and

the ability to drive up to 80mA of output current.

The LT1395/LT1396/LT1397 operate on all supplies from a

single 4V to ±6V. At ±5V, they draw 4.6mA of supply cur-

rent per ampliﬁ er. The LT1395CS6 also adds a shutdown

pin. When disabled, the LT1395CS6 draws virtually zero

supply current and its output becomes high impedance.

The LT1395CS6 will turn on in only 30ns and turn off in

40ns, making it ideal in spread spectrum and portable

equipment applications.

For space limited applications, the LT1395 is available in

TSOT-23 packages, the LT1396 is available in a tiny 3mm ×

3mm × 0.75mm dual ﬁ ne pitch leadless DFN package, and

the LT1397 is available in a tiny 4mm × 3mm × 0.75mm

DFN package.

The LT1395/LT1396/LT1397 are manufactured on Linear

Technology’s proprietary complementary bipolar process.

They have standard single/dual/quad pinouts and they are

optimized for use on supply voltages of ±5V.

Unity-Gain Video Loop-Through Ampliﬁ er

FEATURES

APPLICATIONS

400MHz Bandwidth on ± 5V (A

= 1)

350MHz Bandwidth on ±5V (A

= 2, –1)

0.1dB Gain Flatness: 100MHz (A

= 1, 2 and –1)

High Slew Rate: 800V/μs

Wide Supply Range: ±2V(4V) to ±6V(12V)

80mA Output Current

Low Supply Current: 4.6mA/Ampliﬁ er

LT1395: SO-8, TSOT23-5 and TSOT23-6 Packages

LT1396: SO-8, MSOP and Tiny 3mm

3mm

0.75mm DFN-8 Packages

LT1397: SO-14, SSOP-16 and Tiny 4mm

3mm

0.75mm DFN-14 Packages

Low Proﬁ le (1mm) ThinSOT™ Package

Cable Drivers

Video Ampliﬁ ers

MUX Ampliﬁ ers

High Speed Portable Equipment

IF Ampliﬁ ers

–

OUT

1395/6/7 TA01

12.1k0.67pF

255Ω

1% RESISTORS

FOR A GAIN OF G:

OUT

= G (V

– V

–

)

= R

= (5G – 1) R

TRIM CMRR WITH R

HIGH INPUT RESISTANCE

DOES NOT LOAD CABLE

EVEN WHEN POWER IS OFF

1/2

LT1396

(5G – 1)

63.4Ω

255Ω

1.02k

–

1/2

LT1396

3.01k3.01k

12.1k

–

BNC INPUTS

0.67pF

FREQUENCY (Hz)

100

–60

GAIN (dB)

–50

–40

–30

–20

–10

1k 10k 100k 1G

1395/6/7 TA02

1M 10M 100M

COMMON MODE SIGNAL

NORMAL SIGNAL

Loop-Through Ampliﬁ er

Frequency Response

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Summary of content (20 pages)

PAGE 1
LT1395/LT1396/LT1397 Single/Dual/Quad 400MHz Current Feedback Amplifier DESCRIPTION FEATURES n n n n n n n n n 400MHz Bandwidth on ± 5V (AV = 1) 350MHz Bandwidth on ±5V (AV = 2, –1) 0.1dB Gain Flatness: 100MHz (AV = 1, 2 and –1) High Slew Rate: 800V/μs Wide Supply Range: ±2V(4V) to ±6V(12V) 80mA Output Current Low Supply Current: 4.6mA/Ampliﬁer LT1395: SO-8, TSOT23-5 and TSOT23-6 Packages LT1396: SO-8, MSOP and Tiny 3mm × 3mm × 0.75mm DFN-8 Packages LT1397: SO-14, SSOP-16 and Tiny 4mm × 3mm × 0.
PAGE 2
LT1395/LT1396/LT1397 ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (V + to V –) .............................12.6V Input Current (Note 2)......................................... ±10mA Output Current .................................................. ±100mA Differential Input Voltage (Note 2).............................±5V Output Short-Circuit Duration (Note 3) ........ Continuous Operating Temperature Range (Note 4) LT1395C/LT1396C/LT1397C ................ –40°C to 85°C LT1397H ................
PAGE 3
LT1395/LT1396/LT1397 PIN CONFIGURATION TOP VIEW TOP VIEW OUT 1 V– 2 +IN 3 + – NC 1 6 V+ –IN 2 5 EN +IN 3 4 –IN V– 4 – + TOP VIEW 8 NC OUT A 1 7 V+ –IN A 2 6 OUT +IN A 3 5 NC S8 PACKAGE (1395) 8-LEAD PLASTIC SO S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 150°C, θJA = 230°C/W TJMAX = 150°C, θJA = 150°C/W – + V– 4 – + 8 V+ 7 OUT B 6 –IN B 5 +IN B S8 PACKAGE (1396) 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 150°C/W ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* P
PAGE 4
LT1395/LT1396/LT1397 ELECTRICAL CHARACTERISTICS The ● denotes speciﬁcations which apply over the speciﬁed operating temperature range, otherwise speciﬁcations are at TA = 25°C. For each ampliﬁer: VCM = 0V, VS = ±5V, EN = 0.5V, pulse tested, unless otherwise noted.
PAGE 5
LT1395/LT1396/LT1397 ELECTRICAL CHARACTERISTICS The ● denotes speciﬁcations which apply over the speciﬁed operating temperature range, otherwise speciﬁcations are at TA = 25°C. For each ampliﬁer: VCM = 0V, VS = ±5V, pulse tested, unless otherwise noted.
PAGE 6
LT1395/LT1396/LT1397 TYPICAL AC PERFORMANCE VS (V) AV RL (Ω) RF (Ω) RG (Ω) SMALL SIGNAL – 3dB BW (MHz) SMALL SIGNAL 0.1dB BW (MHz) SMALL SIGNAL PEAKING (dB) ±5 1 100 374 – 400 100 0.1 ±5 2 100 255 255 350 100 0.1 ±5 –1 100 280 280 350 100 0.1 ±5 3 500 221 110 300 100 0.1 ±5 5 500 100 24.9 210 50 0.0 ±5 10 500 90.9 10 65 10 0.0 ±5 10 500 90.9 10Ω||100pF 100 50 0.
PAGE 7
LT1395/LT1396/LT1397 TYPICAL PERFORMANCE CHARACTERISTICS 2nd and 3rd Harmonic Distortion vs Frequency Maximum Undistorted Output Voltage vs Frequency 70 70 HD2 HD3 80 90 AV = +1 5 4 2 110 100k 1M FREQUENCY (Hz) 10M 100M TA = 25°C RF = 374Ω (AV = 1) RF = RG = 255Ω (AV = 2) RL = 100Ω VS = ±5V en 1 0.1 0.
PAGE 8
LT1395/LT1396/LT1397 TYPICAL PERFORMANCE CHARACTERISTICS LT1395CS6 Enable Pin Current vs Temperature 5 –10 3 RL = 100k RL = 150Ω 2 1 VS = ±5V 0 –1 –2 –3 RL = 100k RL = 150Ω EN = 0V –30 –40 EN = –5V –50 –60 –70 –4 –5 –50 VS = ±5V –20 ENABLE PIN CURRENT (μA) OUTPUT VOLTAGE SWING (V) 4 50 25 0 75 100 –25 AMBIENT TEMPERATURE (°C) –80 –50 –25 125 50 100 25 75 0 AMBIENT TEMPERATURE (°C) 125 5.00 VS = ±5V EN = –5V 4.75 EN = 0V, ALL NON-DISABLE DEVICES 4.50 4.25 4.00 3.75 3.50 3.25 3.
PAGE 9
LT1395/LT1396/LT1397 PIN FUNCTIONS LT1395CS5 LT1397CS, LT1397CDE, LT1397HDE OUT (Pin 1): Output. OUT A (Pin 1): A Channel Output. V – (Pin 2): Negative Supply Voltage, Usually –5V. – IN A (Pin 2): Inverting Input of A Channel Ampliﬁer. +IN (Pin 3): Noninverting Input. + IN A (Pin 3): Noninverting Input of A Channel Ampliﬁer. – IN (Pin 4): Inverting Input. V + (Pin 4): Positive Supply Voltage, Usually 5V. V + (Pin 5): Positive Supply Voltage, Usually 5V.
PAGE 10
LT1395/LT1396/LT1397 APPLICATIONS INFORMATION Feedback Resistor Selection Slew Rate The small-signal bandwidth of the LT1395/LT1396/LT1397 is set by the external feedback resistors and the internal junction capacitors. As a result, the bandwidth is a function of the supply voltage, the value of the feedback resistor, the closed-loop gain and the load resistor.
PAGE 11
LT1395/LT1396/LT1397 APPLICATIONS INFORMATION Differential Input Signal Swing OUTPUT To avoid any breakdown condition on the input transistors, the differential input swing must be limited to ± 5V. In normal operation, the differential voltage between the input pins is small, so the ±5V limit is not an issue. Buffered RGB to Color-Difference Matrix EN VS = ±5V VIN = 1V RF = 255Ω RG = 255Ω RL = 100Ω 1395/6/7 F02 Figure 2.
PAGE 12
LT1395/LT1396/LT1397 APPLICATIONS INFORMATION input impedance when considered in parallel with R10. R10 also connects to the inverting input of ampliﬁer A2, adding the B contribution to the Y signal as discussed above. Ampliﬁer A4 is conﬁgured in a noninverting gain of 2 conﬁguration with the bottom of the gain resistor R4 tied to the Y output. The output of ampliﬁer A4 thus results in the color-difference output B-Y.
PAGE 13
LT1395/LT1396/LT1397 SIMPLIFIED SCHEMATIC (each ampliﬁer) V+ –IN +IN OUT EN (LT1395CS6 ONLY) FOR ALL NON-DISABLE DEVICES V– 1395/6/7 SS PACKAGE DESCRIPTION DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698 Rev C) R = 0.125 TYP 5 0.40 p 0.10 8 0.70 p0.05 3.5 p0.05 1.65 p0.05 2.10 p0.05 (2 SIDES) 3.00 p0.10 (4 SIDES) PACKAGE OUTLINE 1.65 p 0.10 (2 SIDES) PIN 1 TOP MARK (NOTE 6) (DD8) DFN 0509 REV C 0.200 REF 0.25 p 0.05 0.50 BSC 2.38 p0.05 0.75 p0.05 4 0.25 p 0.
PAGE 14
LT1395/LT1396/LT1397 PACKAGE DESCRIPTION DE Package 14-Lead Plastic DFN (4mm × 3mm) (Reference LTC DWG # 05-08-1708 Rev B) R = 0.115 TYP 4.00 p0.10 (2 SIDES) R = 0.05 TYP 0.70 p0.05 3.60 p0.05 2.20 p0.05 8 3.30 p0.05 3.30 p0.10 3.00 p0.10 (2 SIDES) 1.70 p 0.05 0.40 p 0.10 14 1.70 p 0.10 PIN 1 NOTCH R = 0.20 OR 0.35 s 45o CHAMFER PIN 1 PACKAGE TOP MARK OUTLINE (SEE NOTE 6) (DE14) DFN 0806 REV B 7 0.75 p0.05 0.200 REF 0.25 p 0.05 0.50 BSC 1 0.25 p 0.05 0.50 BSC 3.00 REF 3.00 REF 0.00 – 0.
PAGE 15
LT1395/LT1396/LT1397 PACKAGE DESCRIPTION MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660 Rev F) 0.889 p 0.127 (.035 p .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 3.00 p 0.102 (.118 p .004) (NOTE 3) 0.65 (.0256) BSC 0.42 p 0.038 (.0165 p .0015) TYP 8 7 6 5 0.52 (.0205) REF RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 3.00 p 0.102 (.118 p .004) (NOTE 4) 4.90 p 0.152 (.193 p .006) DETAIL “A” 0o – 6o TYP GAUGE PLANE 1 0.53 p 0.152 (.021 p .006) DETAIL “A” 2 3 4 1.10 (.
PAGE 16
LT1395/LT1396/LT1397 PACKAGE DESCRIPTION S5 Package 5-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1633) 0.62 MAX 0.95 REF 2.90 BSC (NOTE 4) 1.22 REF 1.4 MIN 3.85 MAX 2.62 REF 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 – 0.45 TYP 5 PLCS (NOTE 3) 0.95 BSC 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 0.09 – 0.20 (NOTE 3) NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3.
PAGE 17
LT1395/LT1396/LT1397 PACKAGE DESCRIPTION S6 Package 6-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1634) 0.62 MAX 2.90 BSC (NOTE 4) 0.95 REF 1.22 REF 3.85 MAX 2.62 REF 1.4 MIN 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE ID RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 – 0.45 6 PLCS (NOTE 3) 0.95 BSC 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 0.09 – 0.20 (NOTE 3) 1.90 BSC S6 TSOT-23 0302 REV B NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3.
PAGE 18
LT1395/LT1396/LT1397 PACKAGE DESCRIPTION S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 .050 BSC 8 .245 MIN 7 6 5 .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) .030 ±.005 TYP 1 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 0°– 8° TYP .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN .053 – .069 (1.346 – 1.752) .014 – .019 (0.
PAGE 19
LT1395/LT1396/LT1397 PACKAGE DESCRIPTION S Package 14-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .337 – .344 (8.560 – 8.738) NOTE 3 .045 ±.005 .050 BSC 14 N 12 11 10 9 8 N .245 MIN .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) 1 .030 ±.005 TYP 13 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT 1 .010 – .020 s 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 2 3 4 5 .053 – .069 (1.346 – 1.752) NOTE: 1. DIMENSIONS IN .
PAGE 20
LT1395/LT1396/LT1397 TYPICAL APPLICATION Single Supply RGB Video Ampliﬁer input. Assuming a 75Ω source impedance for the signal driving VIN, the Thevenin equivalent signal arriving at A1’s positive input is 3V + 0.4VIN, with a source impedance of 714Ω. The combination of these two inputs gives an output at the cathode of D2 of 2 • VIN with no additional DC offset. The 75Ω back termination resistor R9 halves the signal again such that VOUT equals a buffered version of VIN.