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PDF LMH6645 Data sheet ( Hoja de datos )
| Número de pieza | LMH6645 | |
| Descripción | 2.7V / 650A / 55MHz / Rail-to-Rail Input and Output Amplifiers with Shutdown Option | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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February 2002
LMH6645/46/47
2.7V, 650µA, 55MHz, Rail-to-Rail Input and Output
Amplifiers with Shutdown Option
General Description
The LMH6645 (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).
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 ±20mA for
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.
Features
(VS = 2.7V, TA = 25˚C, RL = 1kΩ to V+/2, AV = +1. Typical
values unless specified).
n −3dB BW
55MHz
n Supply voltage range
2.5V to 12V
n Slew rate
22V/µs
n Supply current
650µA/channel
n Output short circuit current
42mA
n Linear output current
±20mA
n Input common mode voltage
0.3V beyond rails
n Output voltage swing
20mV from rails
n Input voltage noise
17nV/
n Input current noise
0.75pA/
Applications
n Active filters
n High speed portable devices
n Multiplexing applications (LMH6647)
n Current sense buffer
n High speed transducer amp
Connection Diagrams
SOT23-5 (LMH6645)
SOT23-6 (LMH6647)
SOIC-8 (LMH6645)
Top View
20020259
Top View
20020260
Top View
20020261
© 2002 National Semiconductor Corporation DS200202
www.national.com
1 page  
5V Electrical Characteristics (Continued)
Unless otherwise specified, all limits guaranteed for at TJ = 25˚C, V+ = 5V, V− = 0V, VCM = VO = V+/2, and Rf = 2kΩ, and RL
= 1kΩ to V+/2. Boldface limits apply at the temperature extremes.
Symbol
Parameter
Conditions
Min Typ Max
(Note 6) (Note 5) (Note 6)
Units
CIN Common Mode Input
Capacitance
2 pF
CMVR
Input Common-Mode Voltage CMRR ≥ 50dB
Range
−0.5 −0.3
−0.1
5.3 5.5
5.1
V
CMRR
Common Mode Rejection
Ratio
VCM Stepped from 0V to 5V
VCM Stepped from 0V to 3.8V
56 82
66 85
dB
AVOL
Large Signal Voltage Gain
VO = 1.5V to 3.5V
76 85
74
dB
VO Output Swing
High
RL = 1k to V+/2
RL = 10k to V+/2
4.80 4.95
4.98
V
Output Swing
Low
RL = 1k to V+/2
RL = 10k to V+/2
50 200
mV
20
ISC Output Short Circuit Current Sourcing to V−
VID = 200mV (Note 10)
Sinking to V+
VID = −200mV (Note 10)
55
mA
53
IOUT
Output Current
VOUT = 0.5V From rails
±20 mA
PSRR
Power Supply Rejection Ratio V+ = 5V to 6V or V− = 0V to −1V
75
95
dB
IS Supply Current (per channel) Normal Operation
Shutdown Mode (LMH6647 only)
700 1400
10 50
µA
±5V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for at TJ = 25˚C, V+ = 5V, V− = −5V, VCM = VO = 0V, Rf = 2kΩ, and RL =
1kΩ to GND. Boldface limits apply at the temperature extremes.
Symbol
Parameter
Conditions
Min Typ Max
(Note 6) (Note 5) (Note 6)
Units
BW −3dB BW
AV = +1, VOUT = 200mVPP
en Input-Referred Voltage Noise f = 100kHz
f = 1kHz
40 55
17
25
MHz
nV/
in Input-Referred Current Noise f = 100kHz
f = 1kHz
0.75
pA/
1.20
CT Rej.
SR
TON
TOFF
THSD
Cross-Talk Rejection
(LMH6646 only)
Slew Rate
Turn-On Time (LMH6647 only)
Turn-Off Time (LMH6647 only)
Shutdown Threshold
(LMH6647 only)
f = 5MHz, Receiver:
Rf = Rg = 510Ω, AV = +2
AV = −1, VO = 2VPP (Note 8)
IS ≤ 50µA
47 dB
15 22
V/µs
200 ns
700 ns
4.25 4.60
V
ISD Shutdown Pin Input Current
(LMH6647 only)
VOS Input Offset Voltage
TC VOS Input Offset Average Drift
(Note 7)
−5V ≤ VCM ≤ 5V
(Note 12)
−20
−3 ±1
−4
±5
µA
3
mV
4
µV/˚C
5 www.national.com
5 Page 
Typical Performance Characteristics At TJ = 25˚C. Unless otherwise specified. (Continued)
VOSvs. VOUT (A Typical Unit)
VOSvs. VCM (A Typical Unit)
VOSvs. VCM (A Typical Unit)
20020229
20020231
VOSvs. VCM (A Typical Unit)
IB vs. VCM
20020230
IB vs. VCM
20020232
20020226
11
20020219
www.national.com
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet LMH6645.PDF ] | |
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