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PDF LTC6910-2 Data sheet ( Hoja de datos )
| Número de pieza | LTC6910-2 | |
| Descripción | (LTC6910-1/-2/-3) Digitally Controlled Programmable Gain Amplifiers | |
| Fabricantes | Linear | |
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LTC6910-1
LTC6910-2/LTC6910-3
Digitally Controlled
Programmable
Gain Amplifiers in SOT-23
FEATURES
s 3-Bit Digital Gain Control in Three Gain-Code
Options
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 Down to 8nV/√Hz
s System Dynamic Range to 120dB
s Input Offset Voltage: 1.5mV
s 8-Pin Low Profile (1mm) SOT-23
(ThinSOT™) Package
U
APPLICATIO S
s Data Acquisition Systems
s Dynamic Gain Changing
s Automatic Ranging Circuits
s Automatic Gain Control
DESCRIPTIO
The LTC®6910 family are low noise digitally program-
mable gain amplifiers (PGAs) that are easy to use and
occupy very little PC board space. The inverting gain is
adjustable using a 3-bit digital input to select gains of 0, 1,
2, 5, 10, 20, 50 and 100V/V in the LTC6910-1; 0, 1, 2, 4,
8, 16, 32 and 64V/V in the LTC6910-2; and 0, 1, 2, 3, 4, 5,6
and 7V/V in the LTC6910-3.
The LTC6910-Xs are inverting amplifiers with rail-to-rail
output. 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 LTC6910-X family is
offered in an 8-lead SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
U.S. Patent Number 6121908.
TYPICAL APPLICATIO
Single Supply Programmable Amplifier
DIGITAL INPUTS GAIN IN VOLTS/VOLT
G2 G1 G0 6910-1 6910-2 6910-3
000 0 0 0
0 0 1 –1 –1 –1
0 1 0 –2 –2 –2
0 1 1 –5 –4 –3
1 0 0 –10 –8 –4
1 0 1 –20 –16 –5
1 1 0 –50 –32 –6
1 1 1 –100 –64 –7
V+
2.7V TO 10.5V
0.1µF
8
4
31
VIN LTC6910-X VOUT = GAIN • VIN
2
5
6
AGND
7 1µF OR LARGER
G2 G1 G0
6910 TA01
PIN 2 (AGND) PROVIDES BUILT-IN HALF-SUPPLY
REFERENCE WITH INTERNAL RESISTANCE OF 5k.
AGND CAN ALSO BE DRIVEN BY A SYSTEM ANALOG
GROUND REFERENCE NEAR HALF SUPPLY
Frequency Response (LTC6910-1)
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
6910 TA01b
6910123fa
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Free Datasheet http://www.datasheet4u.com/
1 page  
LTC6910-1
LTC6910-2/LTC6910-3
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
LTC6910-1C/LTC6910-1I LTC6910-1H
MIN TYP MAX MIN TYP MAX
Specifications for LTC6910-1 Only
Voltage Gain (Note 7)
VS = 2.7V, Gain = 1, RL = 10k
VS = 2.7V, Gain = 1, RL = 500Ω
VS = 2.7V, Gain = 2, RL = 10k
VS = 2.7V, Gain = 5, RL = 10k
VS = 2.7V, Gain = 10, RL = 10k
VS = 2.7V, Gain = 10, RL = 500Ω
VS = 2.7V, Gain = 20, RL = 10k
VS = 2.7V, Gain = 50, RL = 10k
VS = 2.7V, Gain = 100, RL = 10k
VS = 2.7V, 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 = 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
Offset Voltage Magnitude (Internal Op Amp)
(VOS(OA)) (Note 8)
Offset Voltage Drift (Internal Op Amp) (Note 8)
q – 0.05 0 0.07 – 0.06 0 0.07
q – 0.1 – 0.02 0.06 – 0.12 – 0.02 0.08
q 5.96 6.02 6.08 5.96 6.02 6.08
q 13.85 13.95 14.05 13.83 13.95 14.05
q 19.7 19.9 20.1 19.7 19.9 20.1
q 19.6 19.85 20.1 19.4 19.85 20.1
q 25.7 25.9 26.1 25.65 25.9 26.1
q 33.5 33.8 34.1 33.4 33.8 34.1
q 39 39.6 40.2 38.7 39.6 40.2
q 37.4 39 40.1 36.4 39 40.1
q – 0.05 0 0.07 – 0.05 0 0.07
q – 0.1 – 0.01 0.08 – 0.11 – 0.01 0.08
q 5.96 6.02 6.08 5.955 6.02 6.08
q 13.8 13.95 14.1 13.75 13.95 14.1
q 19.8 19.9 20.1 19.75 19.9 20.1
q 19.6 19.85 20.1 19.45 19.85 20.1
q 25.8 25.9 26.1 25.70 25.9 26.1
q 33.5 33.8 34.1 33.4 33.8 34.1
q 39.3 39.7 40.1 39.1 39.7 40.1
q 38 39.2 40.1 37 39.2 40.1
q – 0.05 0 0.07 – 0.05 0 0.07
q – 0.1 – 0.01 0.08 – 0.1 – 0.01 0.08
q 5.96 6.02 6.08 5.96 6.02 6.08
q 13.80 13.95 14.1 13.80 13.95 14.1
q 19.8 19.9 20.1 19.75 19.9 20.1
q 19.7 19.9 20.1 19.6 19.9 20.1
q 25.8 25.95 26.1 25.75 25.95 26.1
q 33.7 33.85 34 33.6 33.85 34
q 39.4 39.8 40.2 39.25 39.8 40.2
q 38.8 39.6 40.1 38 39.6 40.1
q 1.5 9
1.5 11
68
Offset Voltage Magnitude
(Referred to “IN” Pin) (VOS(IN))
DC Input Resistance (Note 9)
Gain = 1
Gain = 10
DC VIN = 0V
Gain = 0
Gain = 1
Gain = 2
Gain = 5
Gain = 10, 20, 50, 100
q 3 15
q 1.7 10
>100
q 10
q5
q2
q1
3 18
1.7 12
>100
10
5
2
1
UNIT
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
mV
µV/°C
mV
mV
MΩ
kΩ
kΩ
kΩ
kΩ
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Free
5 Page 
LTC6910-1
LTC6910-2/LTC6910-3
TYPICAL PERFOR A CE CHARACTERISTICS (LTC6910-1)
LTC6910-1 Gain Shift
vs Temperature
0.2 VS = ± 2.5V
OUTPUT UNLOADED
0.1 GAIN = 100
GAIN = 10
0
GAIN = 1
–0.1
–0.2
–50
0 50 100
TEMPERATURE (°C)
150
6910 G01
LTC6910-1 Frequency Response
50
GAIN OF 100
40
GAIN OF 50
VS = ±5V, VIN = 5mVRMS
30 GAIN OF 20
GAIN OF 10
20
GAIN OF 5
10 GAIN OF 2
GAIN OF 1
0
–10
100
1k 10k 100k 1M
FREQUENCY (Hz)
10M
6910 G02
LTC6910-1 –3dB Bandwidth
vs Gain Setting
8.0
7.5
7.0
•
6.5
6.0 •
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
1
•
•
VIN = 5mVRMS
• VS = 2.7V
• VS = ±5V
•
•
•• ••
10
GAIN
••
100
6910 G03
LTC6910-1 Output Voltage Swing
vs Load Current
+VS
+VS – 0.5
+VS – 1.0
VS = ±2.5V
125°C
25°C
–40°C
SOURCE
+VS – 1.5
+VS – 2.0
–VS + 2.0
–VS + 1.5
–VS + 1.0
–VS + 0.5
–VS
0.01
SINK
0.1 1
10
OUTPUT CURRENT (mA)
100
6910 G04
LTC6910-1 Power Supply
Rejection vs Frequency
90
VS = ±2.5V
80 GAIN = 1
70
+SUPPLY
60
–SUPPLY
50
40
30
20
10
0
0.1 1 10 100 1000
FREQUENCY (kHz)
6910 G05
LTC6910-1 Noise Density
vs Frequency
100
INPUT-REFERRED
VS = ±2.5V
TA = 25°C
GAIN = 1
GAIN = 10
10
GAIN = 100
1
1 10 100
FREQUENCY (kHz)
6910 G06
LTC6910-1 Distortion with Light
Loading (RL = 10k)
–30
VS = ±2.5V
–40
VOUT = 1VRMS (2.83VP-P)
THD MEASURES HD2 AND HD3
3
1
–50 0.3
–60
GAIN = 100
–70
GAIN = 10
–80
GAIN = 1
–90
0.1
0.03
0.01
0.003
–100
0
50 100 150
FREQUENCY (kHz)
0.001
200
6910 G07
LTC6910-1 Distortion with Heavy
Loading (RL = 500Ω)
–30 3
–40 GAIN = 100
–50
GAIN = 10
–60
1
0.3
0.1
–70
GAIN = 1
–80
0.03
0.01
–90 VS = ±2.5V
VOUT = 1VRMS (2.83VP-P)
THD MEASURES HD2 AND HD3
–100
0 50 100 150
FREQUENCY (kHz)
0.003
0.001
200
6910 G08
LTC6910-1 THD + Noise
vs Input Voltage
–20
fIN = 1kHz
–30 VS = ±5V
NOISE BW = 22kHz
–40
GAIN SETTING = 100
–50
–60 GAIN SETTING = 10
–70
–80
–90
–100
–110
0.01
GAIN SETTING = 1
0.1 1
INPUT VOLTAGE (VP-P)
10
6910 G09
6910123fa
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC6910-2.PDF ] | |
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