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PDF LTC6911IMS-2 Data sheet ( Hoja de datos )
| Número de pieza | LTC6911IMS-2 | |
| Descripción | Dual Matched Amplifiers with Digitally Programmable Gain in MSOP | |
| Fabricantes | Linear Technology | |
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LTC6911-1/LTC6911-2
Dual Matched Amplifiers
with Digitally Programmable
Gain in MSOP
FEATURES
s 3-Bit Digital Gain Control:
(Inverting Gains of 0, 1, 2, 5, 10, 20, 50
and 100V/V) -1 Option
(Inverting Gains of 0, 1, 2, 4, 8, 16, 32
and 64V/V) -2 Option
s Two Matched Programmable Gain Amplifiers
s Channel-to-Channel Gain Matching of 0.1dB (Max)
s Rail-to-Rail Input Range
s Rail-to-Rail Output Swing
s Single or Dual Supply: 2.7V to 10.5V Total
s 11MHz Gain Bandwidth Product
s Input Noise: 10nV/√Hz
s Total System Dynamic Range to 120dB
s Input Offset Voltage: 2mV, Gain of 10
s Low Profile 10-Lead MSOP Package
U
APPLICATIO S
s Data Acquisition Systems
s Dynamic Gain Changing
s Automatic Ranging Circuits
s Automatic Gain Control
DESCRIPTIO
The LTC®6911 is a family of low noise digitally program-
mable gain amplifiers (PGAs) that are easy to use and
occupy very little PC board space. The matched gain of
both channels is adjustable using a 3-bit parallel interface
to select voltage gains of 0, 1, 2, 5, 10, 20, 50 and 100V/
V (LTC6911-1) and 0, 1, 2, 4, 8, 16, 32 and 64V/V
(LTC6911-2). All gains are inverting.
The LTC6911 family consists of two matched inverting
amplifiers with rail-to-rail outputs. When operated with
unity gain, they will also process rail-to-rail input signals.
A half-supply reference generated internally at the AGND
pin supports single power supply applications. Operating
from single or split supplies from 2.7V to 10.5V, the
LTC6911 family is offered in a 10-lead MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
V+
2.7V TO 10.5V 0.1µF
79
DIGITAL
INPUT
GAIN IN V/V
G2 G1 G0 LTC6911-1 LTC6911-2
000
001
010
011
0
–1
–2
–5
0
–1
–2
–4
1 0 0 –10
–8
1 0 1 –20
–16
1 1 0 –50
–32
1 1 1 –100
–64
AGND
VINA
1
≥1µF
2
VINB
3
LTC6911-X
10 VOUTA =
GAIN • VINA
8 VOUTB =
GAIN • VINB
691112 TA01
456
G0 G1 G2
Frequency Response (LTC6911-1)
50
VS = 10V, VIN = 5mVRMS
GAIN OF –100 (DIGITAL INPUT 111)
40
30 GAIN OF –50 (DIGITAL INPUT 110)
GAIN OF –20 (DIGITAL INPUT 101)
20
GAIN OF –10 (DIGITAL INPUT 100)
10 GAIN OF –5 (DIGITAL INPUT 011)
GAIN OF –2 (DIGITAL INPUT 010)
0 GAIN OF –1 (DIGITAL INPUT 001)
–10
100
1k 10k 100k 1M
FREQUENCY (Hz)
10M
691112 TA02
sn691112 691112fs
1
1 page  
LTC6911-1/LTC6911-2
ELECTRICAL CHARACTERISTICS The q denotes the specifications that apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = 5V, AGND = 2.5V, Gain = 1 (Digital Inputs 001), RL = 10k
to midsupply point, unless otherwise noted.
PARAMETER
CONDITIONS
C/I GRADES
H GRADE
MIN TYP MAX MIN TYP MAX UNITS
LTC6911-1 Only
Channel-to-Channel Voltage
Gain Match
Gain Temperature Coefficient
Channel-to-Channel Gain Temperature
Coefficient Match
Channel-to-Channel Isolation (Note 7)
Offset Voltage Magnitude Referred
to INA or INB Pins (Note 8)
VS = 5V, Gain = 1, RL = 10k
VS = 5V, Gain = 1, RL = 500Ω
VS = 5V, Gain = 2, RL = 10k
VS = 5V, Gain = 5, RL = 10k
VS = 5V, Gain = 10, RL = 10k
VS = 5V, Gain = 10, RL = 500Ω
VS = 5V, Gain = 20, RL = 10k
VS = 5V, Gain = 50, RL = 10k
VS = 5V, Gain = 100, RL = 10k
VS = 5V, Gain = 100, RL = 500Ω
VS = ±5V, Gain = 1, RL = 10k
VS = ±5V, Gain = 1, RL = 500Ω
VS = ±5V, Gain = 2, RL = 10k
VS = ±5V, Gain = 5, RL = 10k
VS = ±5V, Gain = 10, RL = 10k
VS = ±5V, Gain = 10, RL = 500Ω
VS = ±5V, Gain = 20, RL = 10k
VS = ±5V, Gain = 50, RL = 10k
VS = ±5V, Gain = 100, RL = 10k
VS = ±5V, Gain = 100, RL = 500Ω
VS = 5V, Gain = 1, RL = Open
VS = 5V, Gain = 2, RL = Open
VS = 5V, Gain = 5, RL = Open
VS = 5V, Gain = 10, RL = Open
VS = 5V, Gain = 20, RL = Open
VS = 5V, Gain = 50, RL = Open
VS = 5V, Gain = 100, RL = Open
VS = 5V, Gain = 1, RL = Open
VS = 5V, Gain = 2, RL = Open
VS = 5V, Gain = 5, RL = Open
VS = 5V, Gain = 10, RL = Open
VS = 5V, Gain = 20, RL = Open
VS = 5V, Gain = 50, RL = Open
VS = 5V, Gain = 100, RL = Open
f = 200kHz
VS = 5V, Gain = 1, RL = 10k
VS = 5V, Gain = 10, RL = 10k
VS = 5V, Gain = 100, RL = 10k
Gain = 1
Gain = 10
q –0.1 0.02 0.1
q –0.1 0.02 0.1
q –0.1 0.02 0.1
q –0.15 0.02 0.15
q –0.15 0.02 0.15
q –0.15 0.02 0.15
q –0.15 0.02 0.15
q –0.15 0.02 0.15
q –0.2 0.02 0.2
q –0.8 0.02 0.8
q –0.1 0.02 0.1
q –0.1 0.02 0.1
q –0.1 0.02 0.1
q –0.15 0.02 0.15
q –0.15 0.02 0.15
q –0.15 0.02 0.15
q –0.15 0.02 0.15
q –0.15 0.02 0.15
q –0.2 0.02 0.2
q –0.6 0.02 0.6
2
–1.5
–11
–30
–38
–70
–140
1.0
1.0
0.2
1.0
0.4
3.0
3.0
–0.1 0.02 0.1
–0.1 0.02 0.1
dB
dB
–0.1 0.02 0.1
dB
–0.15 0.02 0.15
dB
–0.15 0.02 0.15
–0.15 0.02 0.15
dB
dB
–0.15 0.02 0.15
dB
–0.15 0.02 0.15
dB
–0.2 0.02 0.2
–1.2 0.02 1.2
dB
dB
–0.1 0.02 0.1
–0.1 0.02 0.1
dB
dB
–0.1 0.02 0.1
dB
–0.15 0.02 0.15
dB
–0.15 0.02 0.15
–0.15 0.02 0.15
dB
dB
–0.15 0.02 0.15
dB
–0.15 0.02 0.15
dB
–0.2 0.02 0.2
–0.9 0.02 0.9
dB
dB
2 ppm/°C
–1.5 ppm/°C-
–11 ppm/°C
–30 ppm/°C
–38 ppm/°C
–70 ppm/°C
–140 ppm/°C
1.0 ppm/°C
1.0 ppm/°C
0.2 ppm/°C
1.0 ppm/°C
0.4 ppm/°C
3.0 ppm/°C
3.0 ppm/°C
108
107
93
q 2.0 22
q 1.1 12
108
107
93
2.0 22
1.1 14
dB
dB
dB
mV
mV
Offset Voltage Magnitude Drift
Gain = 1
Referred to INA or INB Pins (Note 8) Gain = 10
12 20 µV/°C
6.6 11 µV/°C
sn691112 691112fs
5
5 Page 
LTC6911-1/LTC6911-2
TYPICAL PERFOR A CE CHARACTERISTICS (LTC6911-2)
LTC6911-2 Gain Shift
vs Temperature
0.100
0.075
0.050
GAIN = 64
VS = 5V
OUTPUT UNLOADED
0.025 GAIN = 8
0
GAIN = 1
–0.025
–0.050
–0.075
–0.100
–50 –25
0
25 50 75 100
TEMPERATURE (°C)
6911 G010
LTC6911-2 Channel Isolation
vs Frequency
120
VS = 5V
115 VOUT = 1VRMS
GAIN = 8
110
GAIN = 1
105
100
GAIN = 64
95
90
85
100k
FREQUENCY (Hz)
1M
6911 G13
LTC6911-2 Distortion vs Frequency
with Light Loading (RL = 10k)
–30
VS = ±2.5V
–40 VOUT = 1VRMS (2.83VP-P)
–50
–60
GAIN = 64
–70
GAIN = 8
–80
GAIN = 1
–90
–100
0
50k
100k
150k
FREQUENCY (Hz)
200k
6911 G16
LTC6911-2 Frequency Response
50
VS = ±5V
VIN = 10mVRMS
40 GAIN OF 64
GAIN OF 32
30
GAIN OF 16
20 GAIN OF 8
GAIN OF 4
10 GAIN OF 2
GAIN OF 1
0
–10
100
1k 10k 100k 1M
FREQUENCY (Hz)
10M
6911 G11
LTC6911-2 Power Supply
Rejection vs Frequency
90
VS = ±2.5V
80 GAIN = 1
70
+SUPPLY
60
–SUPPLY
50
40
30
20
10
0
1k 10k 100k 1M 10M
FREQUENCY (Hz)
6911 G14
LTC6911-2 Distortion vs Frequency
with Heavy Loading (RL = 500Ω)
–30
VS = ±2.5V
–40 VOUT = 1VRMS (2.83VP-P)
GAIN = 64
–50
GAIN = 8
–60 GAIN = 1
–70
–80
–90
–100
0
50k 100k 150k
FREQUENCY (Hz)
200k
6911 G17
LTC6911-2 –3dB Bandwidth
vs Gain Setting
8.0
7.5 •
7.0
6.5
6.0 •
VIN = 10mVRMS
• VS = 2.7V
• VS = ±5V
5.5
5.0 •
4.5
4.0 •
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
1
•
•
••
•• • •
10 100
GAIN
6911 G12
LTC6911-2 Noise Density
vs Frequency
100
VS = ±2.5V
TA = 25°C
INPUT REFERRED
GAIN = 1
GAIN = 8
10 GAIN = 64
1
1k 10k 100k
FREQUENCY (Hz)
6911 G15
LTC6911-2 THD + Noise
vs Input Voltage
–20
–30
–40
GAIN = 64
–50
GAIN = 8
–60
–70
–80
–90
fIN = 1kHz
–100 VS = ±5V
BW = 100Hz TO 22kHz
–110
1m 10n 0.1
GAIN = 1
1 10
INPUT VOLTAGE (VP-P)
6911 G18
sn691112 691112fs
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC6911IMS-2.PDF ] | |
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