lmh6646-mdc National Semiconductor Corporation, lmh6646-mdc Datasheet

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lmh6646-mdc

Manufacturer Part Number
lmh6646-mdc
Description
2.7v, 650?a, 55mhz Rail-to-rail Input And Output Amplifiers With Shutdown Option
Manufacturer
National Semiconductor Corporation
Datasheet
© 2005 National Semiconductor Corporation
LMH6645/46/47
2.7V, 650µA, 55MHz, Rail-to-Rail Input and Output
Amplifiers with Shutdown Option
General Description
The LMH
input and output voltage feedback amplifiers, offer high
speed (55MHz), and low voltage operation (2.7V) in addition
to micro-power shutdown capability (LMH6647, single).
Input common mode voltage range exceeds either supply by
0.3V, enhancing ease of use in multitude of applications
where previously only inferior devices could be used. Output
voltage range extends to within 20mV of either supply rails,
allowing wide dynamic range especially in low voltage appli-
cations. Even with low supply current of 650µA/amplifier,
output current capability is kept at a respectable
driving heavier loads. Important device parameters such as
BW, Slew Rate and output current are kept relatively inde-
pendent of the operating supply voltage by a combination of
process enhancements and design architecture.
In portable applications, the LMH6647 provides shutdown
capability while keeping the turn-off current to less than
50µA. Both turn-on and turn-off characteristics are well be-
haved with minimal output fluctuations during transitions.
This allows the part to be used in power saving mode, as
well as multiplexing applications. Miniature packages
(SOT23, MSOP-8, and SO-8) are further means to ease the
adoption of these low power high speed devices in applica-
tions where board area is at a premium.
Connection Diagrams
LMH
is a trademark of National Semiconductor Corporation.
SOT23-5 (LMH6645)
6645 (single) and LMH6646 (dual), rail-to-rail
Top View
20020259
DS200202
±
20mA for
SOT23-6 (LMH6647)
Top View
Features
(V
values unless specified).
n −3dB BW
n Supply voltage range
n Slew rate
n Supply current
n Output short circuit current
n Linear output current
n Input common mode voltage
n Output voltage swing
n Input voltage noise
n Input current noise
Applications
n Active filters
n High speed portable devices
n Multiplexing applications (LMH6647)
n Current sense buffer
n High speed transducer amp
S
= 2.7V, T
20020260
A
= 25˚C, R
L
= 1kΩ to V
SOIC-8 (LMH6645)
Top View
+
/2, A
0.3V beyond rails
20mV from rails
V
650µA/channel
www.national.com
= +1. Typical
0.75pA/
2.5V to 12V
17nV/
June 2005
±
55MHz
22V/µs
42mA
20mA
20020261

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lmh6646-mdc Summary of contents

Page 1

... Rail-to-Rail Input and Output Amplifiers with Shutdown Option General Description The LMH 6645 (single) and LMH6646 (dual), rail-to-rail ™ input and output voltage feedback amplifiers, offer high speed (55MHz), and low voltage operation (2.7V) in addition to micro-power shutdown capability (LMH6647, single). ...

Page 2

... Units Tape and Reel 3k Units Tape and Reel A69A 1k Units Tape and Reel 3k Units Tape and Reel LMH6645MA 95 Units Rails 2.5k Units Tape and Reel LMH6646MA 95 Units Rails 2.5k Units Tape and Reel LMH6647MA 95 Units Rails 2.5k Units Tape and Reel A70A 1k Units Tape and Reel 3 ...

Page 3

... V /2. Boldface limits apply at the temperature extremes. Symbol Parameter BW −3dB BW e Input-Referred Voltage Noise n i Input-Referred Current Noise n CT Rej. Cross-Talk Rejection (LMH6646 only) SR Slew Rate T Turn-On Time ON (LMH6647 only) T Turn-Off Time OFF (LMH6647 only) TH Shutdown Threshold SD (LMH6647 only) ...

Page 4

... V /2. Boldface limits apply at the temperature extremes. Symbol Parameter BW −3dB BW e Input-Referred Voltage Noise n i Input-Referred Current Noise n CT Rej. Cross-Talk Rejection (LMH6646 only) SR Slew Rate T Turn-On Time (LMH6647 only Turn-Off Time (LMH6647 only) OFF TH Shutdown Threshold SD (LMH6647 only) I ...

Page 5

... GND. Boldface limits apply at the temperature extremes. Symbol Parameter BW −3dB BW e Input-Referred Voltage Noise n i Input-Referred Current Noise n CT Rej. Cross-Talk Rejection (LMH6646 only) SR Slew Rate T Turn-On Time (LMH6647 only Turn-Off Time (LMH6647 only) OFF TH Shutdown Threshold SD (LMH6647 only) ...

Page 6

Electrical Characteristics Unless otherwise specified, all limits guaranteed for at T 1kΩ to GND. Boldface limits apply at the temperature extremes. Symbol Parameter I Input Bias Current B I Input Offset Current OS R Common Mode Input IN ...

Page 7

Typical Performance Characteristics Closed Loop Frequency Response for Various Temperature Open Loop Gain/Phase vs. Frequency for Various Temperature THD vs. Output Swing 25˚C. Unless otherwise specified. J Frequency Response for Various A 20020249 THD vs. Output Swing ...

Page 8

Typical Performance Characteristics Settling Time vs. Step Size + V from V vs. I OUT + Output Swing from V vs. R www.national.com 25˚C. Unless otherwise specified. (Continued) J 20020252 SOURCE 20020237 (tied to V /2) Output ...

Page 9

Typical Performance Characteristics + Output Swing from V vs − Output Swing from V vs Cap Load Tolerance and Setting Time vs. Closed Loop Gain 25˚C. Unless otherwise specified. (Continued) J (tied to ...

Page 10

... Typical Performance Characteristics PSRR vs. Frequency Crosstalk Rejection vs. Frequency (Output to Output) (LMH6646 Typical Unit www.national.com 25˚C. Unless otherwise specified. (Continued) J CMRR vs. Frequency 20020247 V 20020257 V vs 20020218 10 20020251 Distribution OS 20020225 (A Typical Unit) OUT 20020228 ...

Page 11

Typical Performance Characteristics V vs Typical Unit) OS OUT V vs Typical Unit vs 25˚C. Unless otherwise specified. (Continued vs 20020229 V vs. ...

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Typical Performance Characteristics I vs (mA) (per channel vs. V (LMH6647) S SHUTDOWN www.national.com 25˚C. Unless otherwise specified. (Continued) J 20020227 I vs 20020224 I vs 20020220 ...

Page 13

Typical Performance Characteristics Shutdown Pin and Supply Current vs. Shutdown Voltage Large Signal Step Response Output Overload Recovery 25˚C. Unless otherwise specified. (Continued) J Small Signal Step Response 20020208 Large Signal Step Response 20020244 20020246 13 20020243 ...

Page 14

Application Notes CIRCUIT DESCRIPTION The LMH6645/6646/6647 family is based on National Semi- conductor’s proprietary VIP10 dielectrically isolated bipolar process. This device family architecture features the following: • Complimentary bipolar devices with exceptionally high f (∼8GHz) even under low supply voltage ...

Page 15

Application Notes (Continued) During shutdown, the input stage has an equivalent circuit as shown below in Figure 2 FIGURE 2. LMH6647 Equivalent Input in Shutdown Mode As can be seen above, in shutdown, there may be current flow through the ...

Page 16

... Device 20020235 LMH6645MF LMH6645MA LMH6646MA LMH6646MM LMH6647MA LMH6647MF These free evaluation boards are shipped when a device sample request is placed with National Semiconductor. LMH6647 Evaluation For normal operation, tie the SD pin to V ...

Page 17

Physical Dimensions inches (millimeters) unless otherwise noted 5-Pin SOT23 NS Package Number MF05A 6-Pin SOT23 NS Package Number MF06A 17 www.national.com ...

Page 18

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) 8-Pin SOIC NS Package Number M08A 8Pin MSOP NS Package Number MUA08A 18 ...

Page 19

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information ...

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