digitally programmable gain amplifiers (PGA) that are
easy to use and occupy very little PC board space. The
gains for both channels are independently programmable
using a 3-wire SPI interface to select voltage gains of 0, 1,
2, 5, 10, 20, 50, and 100V/V (LTC6912-1 ); and 0, 1, 2, 4,
8, 16, 32, and 64V/V (LTC6912-2). All gains are inverting.
The LTC6912 family consists of 2 matched 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 total, the LTC6912-X
family is offered in tiny SSOP and DFN-12 Packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
FEATURES
■
■
■
■
■
■
■
■
■
■
■
■
■
2 Channels with Independent Gain Control
LTC6912-1: (0, 1, 2, 5, 10, 20, 50, and 100V/V)
LTC6912-2: (0, 1, 2, 4, 8, 16, 32, and 64V/V)
Offset Voltage = 2mV Max (–40°C to 85°C)
Channel-to-Channel Gain Matching of 0.1dB Max
3-Wire SPI
TM
Interface
Extended Gain-Bandwidth at High Gains
Wired-OR Outputs Possible (2:1 Analog MUX
Function)
Low Power Hardware Shutdown (GN-16 Only,
2µA Max at 2.7V)
Rail-to-Rail Input Range
Rail-to-Rail Output Swing
Single or Dual Supply: 2.7V to 10.5V Total
Input Noise: 12.6nV/√Hz
Total System Dynamic Range to 115dB
16-Pin GN (SSOP) or 12-Pin DFN Package Options
Data Acquisition Systems
Dynamic Gain Changing
Automatic Ranging Circuits
Automatic Gain Control
APPLICATIO S
■
■
■
■
TYPICAL APPLICATIO
3V
12
V
+
A Dual, Matched Low Noise PGA (16-Lead SSOP Package)
0.1µF
14
V
–
40
GAIN OF 64
GAIN OF 32
GAIN OF 16
V
INA
1µF
2
INA
OUT A
15
V
OUTA
= GAIN
A
• V
INA
30
3
GAIN (dB)
AGND
LTC6912-X
20 GAIN OF 8
GAIN OF 4
10
GAIN OF 2
GAIN OF 1
V
INB
4
INB
OUT B
13
V
OUTB
= GAIN
B
• V
INB
0
SHDN
3-WIRE
SPI
INTERFACE
CS/LD
DATA
CLK
5
6
7
8
CHB
SHDN
CS/LD
D
IN
CHA
DGND
D
OUT
10
9
6912 TA01a
–10
0.1
1
10
100
1000
FREQUENCY (kHz)
10000
6912 TA01b
U
U
U
LTC6912-2
Frequency Response
V
S
=
±2.5V
V
IN
= 10mV
RMS
6912fa
1
LTC6912
ABSOLUTE
(Note 1)
AXI U RATI GS
V
–
) ...............................
Specified Temperature Range (Note 3)
LTC6912C-1, LTC6912C-2 ..................–40°C to 85°C
LTC6912I-1, LTC6912I-2 .....................–40°C to 85°C
LTC6912H-1, LTC6912H-2
(GN-16 Only) .....................................–40°C to 125°C
Storage Temperature Range ..................–65°C to 150°C
UE Package ....................................... –65°C to 125°C
Lead Temperature (Soldering, 10sec)................... 300°C
Total Supply Voltage (V
+
to
11V
Input Current ......................................................
±10mA
Operating Temperature Range (Note 2)
LTC6912C-1, LTC6912C-2 ..................–40°C to 85°C
LTC6912I-1, LTC6912I-2 .....................–40°C to 85°C
LTC6912H-1, LTC6912H-2
(GN-16 Only) .....................................–40°C to 125°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
INA
AGND
INB
CS/LD
DIN
CLK
1
2
3
4
5
6
13
12 OUTA
11 V
–
10 OUTB
9
8
7
V
+
DGND
DOUT
UE12 PACKAGE
12-LEAD (4mm
×
3mm) PLASTIC DFN
EXPOSED PAD IS CONNECTED TO V
–
(PIN 13),
MUST BE SOLDERED TO PCB
T
JMAX
= 125°C,
θ
JA
= 160°C/W
ORDER PART
NUMBER
LTC6912CDE-1
LTC6912IDE-1
LTC6912CDE-2
LTC6912IDE-2
DFN PART*
MARKING
69121
69121
69122
69122
Order Options
Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
2
U
U
W
W W
U
W
TOP VIEW
NC 1
INA 2
AGND 3
INB 4
SHDN 5
CS/LD 6
D
IN
7
CLK 8
16 NC
15 OUT A
14 V
–
13 OUT B
12 V
+
11 NC
10 DGND
9
D
OUT
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
T
JMAX
= 150°C,
θ
JA
= 120°C/W
ORDER PART
NUMBER
LTC6912CGN-1
LTC6912IGN-1
LTC6912HGN-1
LTC6912CGN-2
LTC6912IGN-2
LTC6912HGN-2
GN PART
MARKING
69121
6912I1
6912H1
69122
6912I2
6912H2
6912fa
LTC6912
GAI SETTI GS A D PROPERTIES
Table 1. LTC6912-1 GAIN SETTINGS AND PROPERTIES
UPPER/LOWER
NIBBLE
Q7
Q3
0
0
0
0
0
0
0
0
1
1
Q6
Q2
0
0
0
0
1
1
1
1
0
1
Q5
Q1
0
0
1
1
0
0
1
1
X
X
Q4
Q0
0
1
0
1
0
1
0
1
X
X
NOMINAL
VOLTAGE GAIN
Volts/Volt
0
–1
–2
–5
–10
–20
–50
–100
0
dB
–120
0
6
14
20
26
34
40
–120
MAXIMUM LINEAR INPUT RANGE (V
P-P
)
Dual 5V
Supply
10
10
5
2
1
0.5
0.2
0.1
10
Not Used (Note 11)
Single 5V
Supply
5
5
2.5
1
0.5
0.25
0.1
0.05
5
Single 3V
Supply
3
3
1.5
0.6
0.3
0.15
0.06
0.03
3
NOMINAL INPUT NOMINAL OUTPUT
IMPEDANCE (kΩ) IMPEDANCE (Ω)
(Open)
10
5
2
1
1
1
1
(Open)
Not Used
0.4
0.7
3.4
3.4
3.4
6.4
15
30
(Open)
Table 2. LTC6912-2 GAIN SETTINGS AND PROPERTIES
UPPER/LOWER
NIBBLE
Q7
Q3
0
0
0
0
0
0
0
0
1
1
Q6
Q2
0
0
0
0
1
1
1
1
0
1
Q5
Q1
0
0
1
1
0
0
1
1
X
X
Q4
Q0
0
1
0
1
0
1
0
1
X
X
NOMINAL
VOLTAGE GAIN
Volts/Volt
0
–1
–2
–4
–8
–16
–32
–64
0
dB
–120
0
6
12
18.1
24.1
30.1
36.1
–120
MAXIMUM LINEAR INPUT RANGE (V
P-P
)
Dual 5V
Supply
10
10
5
2.5
1.25
0.625
0.3125
0.156
10
Not Used (Note 11)
Single 5V
Supply
5
5
2.5
1.25
0.625
0.3125
0.156
0.078
5
Single 3V
Supply
3
3
1.5
0.75
0.375
0.188
0.094
0.047
3
NOMINAL INPUT NOMINAL OUTPUT
IMPEDANCE (kΩ) IMPEDANCE (Ω)
(Open)
10
5
2.5
1.25
1.25
1.25
1.25
(Open)
Not Used
0.4
0.7
3.4
3.4
3.4
6.4
15
30
(Open)
U
U
U
6912fa
3
LTC6912
The
●
denotes the specifications that apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
S
= 5V, AGND = 2.5V, Gain = 1, R
L
= 10k to midsupply point, unless
otherwise noted.
PARAMETER
Total Supply Voltage (V
S
)
Supply Current per Channel
Both Amplifiers Active (Gain = 1)
V
S
= 2.7V, V
INA
= V
INB
= V
AGND
V
S
= 5V, V
INA
= V
INB
= V
AGND
V
S
=
±5V,
V
INA
= V
INB
= 0V
Both Amplifiers Inactive (State 1000)
V
S
= 2.7V, V
INA
= V
INB
= V
AGND
V
S
= 5V, V
INA
= V
INB
= V
AGND
V
S
=
±5V,
V
INA
= V
INB
= 0V
V
S
= 2.7V, V
SHDN
= 2.43V
V
S
= 5V, V
SHDN
= 4.5V
V
S
=
±5V,
V
SHDN
= 4.5V
CONDITIONS
●
●
●
●
●
●
●
●
●
●
ELECTRICAL CHARACTERISTICS
C, I GRADES
MIN
TYP
MAX
2.7
1.75
2.0
2.25
150
200
265
0.3
3.6
20
12
60
20
100
30
190
10
50
15
90
20
180
±27
±35
2.45
0.55
0.75
–4.3
55
55
60
80
75
80
12
16
20
26
●
●
H GRADE
MIN
TYP
MAX
2.7
1.75
2.0
2.25
150
200
265
0.3
3.6
20
12
50
20
90
30
80
10
50
15
80
20
180
±27
±35
10.5
3.0
3.25
3.75
280
350
750
5
10
50
35
125
45
190
60
290
25
90
35
175
45
270
UNITS
V
mA
mA
mA
µA
µA
µA
µA
µA
µA
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mA
mA
Specifications for Both the LTC6912-1 and the LTC6912-2
10.5
2.75
3.0
3.5
255
325
750
2
10
50
30
110
40
170
50
260
20
80
30
160
40
250
Supply Current per Channel
(Software Shutdown)
Total-Supply Current
(Hardware Shutdown,
GN-16 Package Only)
Output Voltage Swing LOW
(Note 4)
V
S
= 2.7V, R
L
= 10k Tied to Midsupply Point
●
V
S
= 2.7V, R
L
= 500Ω Tied to Midsupply Point
●
V
S
= 5V, R
L
= 10k Tied to Midsupply Point
V
S
= 5V, R
L
= 500Ω Tied to Midsupply Point
V
S
=
±5V,
R
L
= 10k Tied to 0V
V
S
=
±5V,
R
L
= 500Ω Tied to 0V
●
●
●
●
Output Voltage Swing HIGH
(Note 4)
V
S
= 2.7V, R
L
= 10k Tied to Midsupply Point
●
V
S
= 2.7V, R
L
= 500Ω Tied to Midsupply Point
●
V
S
= 5V, R
L
= 10k Tied to Midsupply Point
V
S
= 5V, R
L
= 500Ω Tied to Midsupply Point
V
S
=
±5V,
R
L
= 10k Tied to 0V
V
S
=
±5V,
R
L
= 500Ω Tied to 0V
●
●
●
●
●
●
●
●
●
●
●
●
●
Output Short-Circuit Current
(Note 5)
AGND Open-Circuit Voltage
(GN-16 Package Only)
AGND (Common Mode)
Input Voltage Range
AGND Rejection (i.e., Common
Mode Rejection or CMRR)
Slew Rate
V
S
= 2.7V
V
S
=
±5V
V
S
= Single 5V Supply, V
SHDN
= 0.5V
V
S
= Single 5V Supply, V
SHDN
= 4.5V
V
S
= Single 2.7V Supply
V
S
= Single 5V Supply
V
S
=
±5V
V
S
= 2.7V, V
AGND
= 1.1V to 1.6V
V
S
=
±5V,
V
AGND
= –2.5V to 2.5V
Gain = 1
V
S
= 5V, V
OUTA
= V
OUTB
= 1.1V to 3.9V
V
S
=
±5V,
V
OUTA
= V
OUTB
=
±1.4V
Gain = 10 (–1), Gain = 8 (–2)
V
S
= 5V, V
OUTA
= V
OUTB
= 1.1V to 3.9V
V
S
=
±5V,
V
OUTA
= V
OUTB
=
±1.4V
2.5
2.65
2.55
1.6
3.65
3.2
2.45
0.55
0.75
–4.3
50
50
57
2.5
2.65
2.55
1.6
3.65
3.2
V
V
V
V
V
dB
dB
dB
V/µs
V/µs
V/µs
V/µs
dB
dB
80
75
80
12
16
20
26
–120
–120
Power Supply Rejection Ratio (PSRR) V
S
=2.7V to
±5V
Signal Attenuation at Gain = 0 Setting
Signal Attenuation in Software
Shutdown
Gain = 0 (Digital Inputs 0000),
f = 200kHz
(State = 1000)
–120
–120
6912fa
4
LTC6912
ELECTRICAL CHARACTERISTICS
PARAMETER
SHDN Input High Voltage
(GN-16 Package Only)
SHDN Input Low Voltage
(GN-16 Package Only)
SHDN Pin 5, Input High Current
(GN-16 Package Only)
SHDN Pin 5, Input Low Current
(GN-16 Package Only)
CONDITIONS
V
S
= Single 2.7V
V
S
= Single 5V
V
S
=
±5V
V
S
= Single 2.7V
V
S
= Single 5V
V
S
=
±5V
V
S
= Single 2.7V
V
S
= Single 5V
V
S
=
±5V
V
S
= Single 2.7V
V
S
= Single 5V
V
S
=
±5V
The
●
denotes the specifications that apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
S
= 5V, AGND = 2.5V, Gain = 1, R
L
= 10k to midsupply point, unless
otherwise noted.
C, I GRADES
MIN
TYP
MAX
●
●
●
●
●
●
MIN
2.43
4.5
4.5
H GRADE
TYP
MAX
UNITS
V
V
V
Specifications for Both the LTC6912-1 and the LTC6912-2
Author: [email]gooogleman@foxmail.com[/email] Date: 2013.05.12 Just now, an engineer working on the prima chip for the in-vehicle GPS solution asked me a question: Can I find a development board that ...
I just started learning, and I am confused when reading the book. The concepts are confusing, and I can't read it anymore. The book is the Principles of Embedded Systems by Beihang University. I don't...
Hello everyone, I searched on the Internet about how to obtain mac through uboot, and it was said that the function of obtaining mac is implemented in the following paragraph in board.c, /* MAC Addres...
[i=s] This post was last edited by 不足论 on 2017-1-7 16:44 [/i] Course link: [url=https://training.eeworld.com.cn/course/3580/learn?iscs=1#lesson/7070]https://training.eeworld.com.cn/course/3580/learn?i...
The core of a machine vision system is image acquisition and processing. All information comes from images, and image quality is crucial to the entire vision system. A good image can improve the st...[Details]
The jammer is a signal blocker, mainly composed of a chip and a radio transmitter. When the car owner presses the remote control lock button, the jammer interferes with the electronic lock receivin...[Details]
The mass production process of the new generation of cockpit platform has started, and the smart cockpit market has entered a new bonus cycle of technology iteration and platform upgrade.
...[Details]
Definition of interactive projection system:
Interactive projection systems, also known as multimedia interactive projection, are available in floor, wall, and tabletop interactive projection....[Details]
In the summer of 2025, BlueOval SK, a joint venture between Ford and SK On, officially started production at its first battery factory in Kentucky.
According to the original plan, this w...[Details]
The practice of warming up a car originated with gasoline-powered vehicles. Warming up the engine allows it to enter a better working state and ensures good lubrication. This has become a habit for...[Details]
Recently, Joyson Electronics has made positive progress in the core technology research and development of the robot's "brain and brain" and key components, and launched the industry's first integr...[Details]
According to foreign media reports, Ford Motor has applied to the U.S. Patent and Social Security Office (USPTO) for a patent for a door anti-collision system that may be used in future Ford vehicl...[Details]
Tires are a very important component for cars. They are related to the driving experience of the vehicle. We are almost inseparable from cars in our daily lives. For tires, according to the role of...[Details]
Civilian internal combustion engines operate in the range of approximately 1000-4000 rpm. This results in the engine's kinetic energy being ineffective at low or high rpm, making starting difficult...[Details]
The power transmission system between a car's engine and drive wheels is called its drivetrain. It ensures the necessary traction and speed under various driving conditions, and coordinates these t...[Details]
On August 19th, Intel and Japan's SoftBank Group announced on Monday that SoftBank would invest $2 billion (approximately 14.376 billion RMB at the current exchange rate) in Intel. Under the agreem...[Details]
Bosch, an "old money" company, is radical in its investment in new technologies.
Bosch announced at this year's Technology Day that it will invest more than 2.5 billion euros (about 21.1...[Details]
Which is brighter, the xenon lamp or the LED lamp?
Which is better, LED or xenon? Which is brighter? We asked experts about these questions. For those confused about this, let's take a look at...[Details]
Photovoltaic water pump inverter, photovoltaic water pump control system and control method
This application provides a photovoltaic water pump inverter, a photovoltaic water pump control sys...[Details]
Embedded System
京公网安备 11010802033920号
EEWORLD
