LINEAR TECHNOLOGY LTC6912 Technical data
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 SPITM 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
U
APPLICATIO S
LTC6912
Dual Programmable
Gain Amplifiers with
Serial Digital Interface
U
DESCRIPTIO
The LTC®6912 is a family of dual channel, low noise,
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.
■
Data Acquisition Systems
■
Dynamic Gain Changing
■
Automatic Ranging Circuits
■
Automatic Gain Control
TYPICAL APPLICATIO
A Dual, Matched Low Noise PGA (16-Lead SSOP Package)
3V
12 14
+
V
2
INA
V
INA
1µF
3
AGND
4
INB
V
INB
CHB CHA
5
3-WIRE
INTERFACE
SHDN
CS/LD
DATA
SPI
CLK
SHDN
6
CS/LD
7
D
IN
8
0.1µF
LTC6912-X
U
DGND
D
OUT
V
OUT A
OUT B
LTC6912-2
–
15
V
= GAINA • V
OUTA
13
V
OUTB
10
9
= GAINB • V
INA
INB
6912 TA01a
Frequency Response
40
GAIN OF 64
GAIN OF 32
30
GAIN OF 16
20
GAIN OF 8
GAIN OF 4
GAIN (dB)
10
GAIN OF 2
GAIN OF 1
0
–10
0.1
1
FREQUENCY (kHz)
VS = ±2.5V
V
IN
10 100 1000
= 10mV
RMS
10000
6912 TA01b
6912fa
1
LTC6912
TOP VIEW
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
INA
AGND
INB
SHDN
CS/LD
D
IN
CLK
NC
OUT A
V
–
OUT B
V
+
NC
DGND
D
OUT
WW
W
U
ABSOLUTE AXI U RATI GS
(Note 1)
Total Supply Voltage (V+ to V–) ............................... 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
UUW
PACKAGE/ORDER I FOR ATIO
TOP VIEW
INA
AGND
INB
CS/LD
DIN
CLK
1
2
3
4
5
6
12
OUTA
–
11
V
OUTB
10
13
+
V
9
DGND
8
DOUT
7
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
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
12-LEAD (4mm × 3mm) PLASTIC DFN
EXPOSED PAD IS CONNECTED TO V
UE12 PACKAGE
MUST BE SOLDERED TO PCB
T
= 125°C, θJA = 160°C/W
JMAX
ORDER PART
NUMBER
LTC6912CDE-1
LTC6912IDE-1
LTC6912CDE-2
LTC6912IDE-2
–
(PIN 13),
DFN PART*
MARKING
69121
69121
69122
69122
T
JMAX
ORDER PART
NUMBER
LTC6912CGN-1
LTC6912IGN-1
LTC6912HGN-1
LTC6912CGN-2
LTC6912IGN-2
LTC6912HGN-2
= 150°C, θJA = 120°C/W
GN PART
MARKING
69121
6912I1
6912H1
69122
6912I2
6912H2
6912fa
LTC6912
UUU
GAI SETTI GS A D PROPERTIES
Table 1. LTC6912-1 GAIN SETTINGS AND PROPERTIES
UPPER/LOWER NOMINAL
NIBBLE VOLTAGE GAIN MAXIMUM LINEAR INPUT RANGE (V
Q7 Q6 Q5 Q4 Dual 5V Single 5V Single 3V NOMINAL INPUT NOMINAL OUTPUT
Q3 Q2 Q1 Q0 Volts/Volt dB Supply Supply Supply IMPEDANCE (kΩ) IMPEDANCE (Ω)
0000 0 –120 10 5 3 (Open) 0.4
0001 –1 0 10 5 3 10 0.7
0010 –2 6 5 2.5 1.5 5 3.4
0011 –5 14 2 1 0.6 2 3.4
0100 –10 20 1 0.5 0.3 1 3.4
0101 –20 26 0.5 0.25 0.15 1 6.4
0110 –50 34 0.2 0.1 0.06 1 15
0111 –100 40 0.1 0.05 0.03 1 30
1 0 X X 0 –120 10 5 3 (Open) (Open)
1 1 X X Not Used (Note 11) Not Used
Table 2. LTC6912-2 GAIN SETTINGS AND PROPERTIES
UPPER/LOWER NOMINAL
NIBBLE VOLTAGE GAIN MAXIMUM LINEAR INPUT RANGE (V
Q7 Q6 Q5 Q4 Dual 5V Single 5V Single 3V NOMINAL INPUT NOMINAL OUTPUT
Q3 Q2 Q1 Q0 Volts/Volt dB Supply Supply Supply IMPEDANCE (kΩ) IMPEDANCE (Ω)
0000 0 –120 10 5 3 (Open) 0.4
0001 –1 0 10 5 3 10 0.7
0010 –2 6 5 2.5 1.5 5 3.4
0011 –4 12 2.5 1.25 0.75 2.5 3.4
0100 –8 18.1 1.25 0.625 0.375 1.25 3.4
0101 –16 24.1 0.625 0.3125 0.188 1.25 6.4
0110 –32 30.1 0.3125 0.156 0.094 1.25 15
0111 –64 36.1 0.156 0.078 0.047 1.25 30
1 0 X X 0 –120 10 5 3 (Open) (Open)
1 1 X X Not Used (Note 11) Not Used
P-P
P-P
)
)
6912fa
3
LTC6912
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
The ● denotes the specifications that apply over the full operating
= 25°C. VS = 5V, AGND = 2.5V, Gain = 1, RL = 10k to midsupply point, unless
A
otherwise noted.
C, I GRADES H GRADE
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Specifications for Both the LTC6912-1 and the LTC6912-2
Total Supply Voltage (VS)
Supply Current per Channel Both Amplifiers Active (Gain = 1)
= 2.7V, V
V
S
= 5V, V
V
S
V
= ±5V, V
S
INA
INA
INA
= V
= V
= V
INB
INB
INB
= V
= V
= 0V
AGND
AGND
Supply Current per Channel Both Amplifiers Inactive (State 1000)
(Software Shutdown) V
= 2.7V, V
S
= 5V, V
V
S
V
= ±5V, V
S
Total-Supply Current VS = 2.7V, V
(Hardware Shutdown, V
GN-16 Package Only) V
= 5V, V
S
= ±5V, V
S
INA
INA
INA
SHDN
SHDN
SHDN
= V
= V
= V
= 4.5V
= 4.5V
= V
INB
= V
INB
= 0V
INB
= 2.43V
AGND
AGND
Output Voltage Swing LOW VS = 2.7V, RL = 10k Tied to Midsupply Point
(Note 4) V
= 2.7V, RL = 500Ω Tied to Midsupply Point
S
VS = 5V, RL = 10k Tied to Midsupply Point
V
= 5V, RL = 500Ω Tied to Midsupply Point
S
VS = ±5V, RL = 10k Tied to 0V
= ±5V, RL = 500Ω Tied to 0V
V
S
Output Voltage Swing HIGH VS = 2.7V, RL = 10k Tied to Midsupply Point
(Note 4) V
= 2.7V, RL = 500Ω Tied to Midsupply Point
S
VS = 5V, RL = 10k Tied to Midsupply Point
V
= 5V, RL = 500Ω Tied to Midsupply Point
S
VS = ±5V, RL = 10k Tied to 0V
V
= ±5V, RL = 500Ω Tied to 0V
S
Output Short-Circuit Current VS = 2.7V
(Note 5) V
AGND Open-Circuit Voltage VS = Single 5V Supply, V
(GN-16 Package Only) V
= ±5V
S
= Single 5V Supply, V
S
= 0.5V
SHDN
= 4.5V 2.65 2.65 V
SHDN
AGND (Common Mode) VS = Single 2.7V Supply
Input Voltage Range V
AGND Rejection (i.e., Common VS = 2.7V, V
Mode Rejection or CMRR) V
= Single 5V Supply
S
= ±5V
V
S
= ±5V, V
S
AGND
AGND
= 1.1V to 1.6V
= –2.5V to 2.5V
Power Supply Rejection Ratio (PSRR) VS =2.7V to ±5V
Slew Rate Gain = 1
= 5V, V
V
S
V
= ±5V, V
S
OUTA
OUTA
= V
= 1.1V to 3.9V 12 12 V/µs
OUTB
= V
= ±1.4V 16 16 V/µs
OUTB
Gain = 10 (–1), Gain = 8 (–2)
= 5V, V
V
S
= ±5V, V
V
S
OUTA
OUTA
= V
= 1.1V to 3.9V 20 20 V/µs
OUTB
= V
= ±1.4V 26 26 V/µs
OUTB
Signal Attenuation at Gain = 0 Setting Gain = 0 (Digital Inputs 0000),
f = 200kHz
Signal Attenuation in Software (State = 1000)
Shutdown
●
2.7 10.5 2.7 10.5 V
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
1.75 2.75 1.75 3.0 mA
2.0 3.0 2.0 3.25 mA
2.25 3.5 2.25 3.75 mA
150 255 150 280 µA
200 325 200 350 µA
265 750 265 750 µA
0.3 2 0.3 5 µA
3.6 10 3.6 10 µA
20 50 20 50 µA
12 30 12 35 mV
60 110 50 125 mV
20 40 20 45 mV
100 170 90 190 mV
30 50 30 60 mV
190 260 80 290 mV
10 20 10 25 mV
50 80 50 90 mV
15 30 15 35 mV
90 160 80 175 mV
20 40 20 45 mV
180 250 180 270 mV
±27 ±27 mA
±35 ±35 mA
2.45 2.5 2.55 2.45 2.5 2.55 V
0.55 1.6 0.55 1.6 V
0.75 3.65 0.75 3.65 V
–4.3 3.2 –4.3 3.2 V
55 80 50 80 dB
55 75 50 75 dB
60 80 57 80 dB
–120 –120 dB
–120 –120 dB
4
6912fa
LTC6912
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
The ● denotes the specifications that apply over the full operating
= 25°C. VS = 5V, AGND = 2.5V, Gain = 1, RL = 10k to midsupply point, unless
A
otherwise noted.
C, I GRADES H GRADE
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Specifications for Both the LTC6912-1 and the LTC6912-2
SHDN Input High Voltage VS = Single 2.7V
(GN-16 Package Only) V
= Single 5V
S
V
= ±5V
S
SHDN Input Low Voltage VS = Single 2.7V
(GN-16 Package Only) V
= Single 5V
S
= ±5V
V
S
SHDN Pin 5, Input High Current VS = Single 2.7V 0.2 0.2 µA
(GN-16 Package Only) V
= Single 5V 1 1 µA
S
= ±5V 1 1 µA
V
S
SHDN Pin 5, Input Low Current VS = Single 2.7V 0.2 0.2 µA
(GN-16 Package Only) V
= Single 5V 1 1 µA
S
V
= ±5V 1 1 µA
S
Specifications for the LTC6912-1 ONLY
Voltage Gain (Note 6) VS = 2.7V, Gain = 1, RL = 10k
V
= 2.7V, Gain = 1, RL = 500Ω
S
= 2.7V, Gain = 2, RL = 10k
V
S
= 2.7V, Gain = 5, RL = 10k
V
S
V
= 2.7V, Gain = 10, RL =10k
S
= 2.7V, Gain = 10, RL = 500Ω
V
S
= 2.7V, Gain = 20, RL = 10k
V
S
V
= 2.7V, Gain = 50, RL = 10k
S
= 2.7V, Gain = 100, RL = 10k
V
S
= 2.7V, Gain = 100, RL = 500Ω
V
S
VS = 5V, Gain = 1, RL = 10k
V
= 5V, Gain = 1, RL = 500Ω
S
= 5V, Gain = 2, RL = 10k
V
S
= 5V, Gain = 5, RL = 10k
V
S
V
= 5V, Gain = 10, RL = 10k
S
= 5V, Gain = 10, RL = 500Ω
V
S
= 5V, Gain = 20, RL = 10k
V
S
V
= 5V, Gain = 50, RL = 10k
S
= 5V, Gain = 100, RL = 10k
V
S
= 5V, Gain = 100, RL = 500Ω
V
S
VS = ±5V, Gain = 1, RL = 10k
V
= ±5V, Gain = 1, RL = 500Ω
S
= ±5V, Gain = 2, RL = 10k
V
S
= ±5V, Gain = 5, RL = 10k
V
S
V
= ±5V, Gain = 10, RL = 10k
S
= ±5V, Gain = 10, RL = 500Ω
V
S
= ±5V, Gain = 20, RL = 10k
V
S
V
= ±5V, Gain = 50, RL = 10k
S
= ±5V, Gain = 100, RL = 10k
V
S
= ±5V, Gain = 100, RL = 500Ω
V
S
●
2.43 2.43 V
●
4.5 4.5 V
●
4.5 4.5 V
●
●
●
●
–0.07 0 0.07 –0.08 0 0.07 dB
●
–0.11 –0.02 0.07 – 0.13 – 0.02 0.07 dB
●
5.94 6.01 6.08 5.93 6.01 6.08 dB
●
13.85 13.95 14.05 13.8 13.95 14.05 dB
●
19.7 19.93 20.1 19.65 19.93 20.1 dB
●
19.55 19.85 20.05 19.35 19.85 20.05 dB
●
25.75 25.94 26.1 25.65 25.94 26.1 dB
●
33.5 33.8 34.05 33.40 33.8 34.05 dB
●
39.2 39.6 40.0 39.0 39.6 40.0 dB
●
37.3 38.9 39.7 36.20 38.9 39.7 dB
●
–0.08 0.01 0.08 –0.09 0.01 0.08 dB
●
–0.11 –0.01 0.07 – 0.13 – 0.01 0.07 dB
●
5.95 6.02 6.09 5.94 6.02 6.09 dB
●
13.8 13.96 14.1 13.78 13.96 14.1 dB
●
19.8 19.94 20.1 19.75 19.94 20.1 dB
●
19.6 19.87 20.1 19.45 19.87 20.1 dB
●
25.78 25.94 26.08 25.75 25.94 26.08 dB
●
33.5 33.84 34.1 33.4 33.84 34.1 dB
●
39.3 39.7 40.1 39.1 39.7 40.1 dB
●
37.75 39.2 39.85 36.6 39.2 39.85 dB
●
–0.06 0.01 0.08 –0.07 0.01 0.08 dB
●
–0.10 0 0.08 –0.11 0 0.08 dB
●
5.95 6.02 6.09 5.94 6.02 6.09 dB
●
13.8 13.96 14.1 13.79 13.96 14.1 dB
●
19.78 19.94 20.08 19.75 19.94 20.08 dB
●
19.68 19.91 20.05 19.58 19.91 20.05 dB
●
25.78 25.95 26.08 25.73 25.95 26.08 dB
●
33.65 33.87 34.05 33.60 33.87 34.05 dB
●
39.4 39.8 40.2 39.25 39.8 40.2 dB
●
38.6 39.5 39.9 37.6 39.5 39.9 dB
0.27 0.27 V
0.5 0.5 V
0.5 0.5 V
6912fa
5
LTC6912
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
The ● denotes the specifications that apply over the full operating
= 25°C. VS = 5V, AGND = 2.5V, Gain = 1, RL = 10k to midsupply point, unless
A
otherwise noted.
C, I GRADES H GRADE
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Specifications for the LTC6912-1 ONLY
Channel-to-Channel VS = 2.7V, Gain = 1, RL = 10k
Voltage Gain Match V
(Note 6) V
= 2.7V, Gain = 1, RL = 500Ω
S
= 2.7V, Gain = 2, RL = 10k
S
V
= 2.7V, Gain = 5, RL = 10k
S
= 2.7V, Gain = 10, RL = 10k
V
S
= 2.7V, Gain = 10, RL = 500Ω
V
S
V
= 2.7V, Gain = 20, RL = 10k
S
= 2.7V, Gain = 50, RL = 10k
V
S
= 2.7V, Gain = 100, RL = 10k
V
S
V
= 2.7V, Gain = 100, RL = 500Ω
S
VS = 5V, Gain = 1, RL = 10k
V
= 5V, Gain = 1, RL = 500Ω
S
= 5V, Gain = 2, RL = 10k
V
S
= 5V, Gain = 5, RL = 10k
V
S
V
= 5V, Gain = 10, RL = 10k
S
= 5V, Gain = 10, RL = 500Ω
V
S
= 5V, Gain = 20, RL = 10k
V
S
V
= 5V, Gain = 50, RL = 10k
S
= 5V, Gain = 100, RL = 10k
V
S
= 5V, Gain = 100, RL = 500Ω
V
S
VS = ±5V, Gain = 1, RL = 10k
V
= ±5V, Gain = 1, RL = 500Ω
S
= ±5V, Gain = 2, RL = 10k
V
S
= ±5V, Gain = 5, RL = 10k
V
S
V
= ±5V, Gain = 10, RL = 10k
S
= ±5V, Gain = 10, RL = 500Ω
V
S
= ±5V, Gain = 20, RL = 10k
V
S
V
= ±5V, Gain = 50, RL = 10k
S
= ±5V, Gain = 100, RL = 10k
V
S
= ±5V, Gain = 100, RL = 500Ω
V
S
Gain Temperature Coefficient VS = 5V, Gain = 1, RL = OPEN 2 2 ppm/°C
(Note 6) V
= 5V, Gain = 2, RL = OPEN –1.5 –1.5 ppm/°C
S
= 5V, Gain = 5, RL = OPEN –11 –11 ppm/°C
V
S
= 5V, Gain = 10, RL = OPEN –30 –30 ppm/°C
V
S
V
= 5V, Gain = 20, RL = OPEN –40 –40 ppm/°C
S
= 5V, Gain = 50, RL = OPEN –70 –70 ppm/°C
V
S
= 5V, Gain = 100, RL = OPEN –140 –140 ppm/°C
V
S
Channel-to-Channel Gain VS = 5V, Gain = 1, RL = OPEN 1 1 ppm/°C
Temperature Coefficient Match V
(Gain Specified in dB’s) V
(Note 6) V
= 5V, Gain = 2, RL = OPEN 1 1 ppm/°C
S
= 5V, Gain = 5, RL = OPEN 0.2 0.2 ppm/°C
S
= 5V, Gain = 10, RL = OPEN –1 –1 ppm/°C
S
V
= 5V, Gain = 20, RL = OPEN –1 –1 ppm/°C
S
= 5V, Gain = 50, RL = OPEN –3 –3 ppm/°C
V
S
= 5V, Gain = 100, RL = OPEN –3 –3 ppm/°C
V
S
Channel-to-Channel Isolation f = 200kHz,
(Note 7) V
= 5V, Gain = 1, RL = 10k 113 113 dB
S
= 5V, Gain = 10, RL = 10k 108 108 dB
V
S
= 5V, Gain = 100, RL = 10k 89 89 dB
V
S
●
–0.1 ±0.02 0.1 –0.1 ±0.02 0.1 dB
●
–0.1 ±0.02 0.1 –0.1 ±0.02 0.1 dB
●
–0.1 ±0.02 0.1 –0.1 ±0.02 0.1 dB
●
–0.15 ±0.02 0.15 –0.15 ±0.02 0.15 dB
●
–0.15 ±0.02 0.15 –0.15 ±0.02 0.15 dB
●
–0.15 ±0.02 0.15 –0.2 ±0.02 0.2 dB
●
–0.15 ±0.02 0.15 –0.15 ±0.02 0.15 dB
●
–0.15 ±0.02 0.15 –0.15 ±0.02 0.15 dB
●
–0.2 ±0.02 0.2 –0.2 ±0.02 0.2 dB
●
–1.0 ±0.02 1.0 –1.5 ±0.02 1.5 dB
●
–0.1 ±0.02 0.1 –0.1 ±0.02 0.1 dB
●
–0.1 ±0.02 0.1 –0.1 ±0.02 0.1 dB
●
–0.1 ±0.02 0.1 –0.1 ±0.02 0.1 dB
●
–0.15 ±0.02 0.15 –0.15 ±0.02 0.15 dB
●
–0.15 ±0.02 0.15 –0.15 ±0.02 0.15 dB
●
–0.15 ±0.02 0.15 –0.15 ±0.02 0.15 dB
●
–0.15 ±0.02 0.15 –0.15 ±0.02 0.15 dB
●
–0.15 ±0.02 0.15 –0.15 ±0.02 0.15 dB
●
–0.2 ±0.02 0.2 –0.2 ±0.02 0.2 dB
●
–0.8 ±0.02 0.8 –1.2 ±0.02 1.2 dB
●
–0.1 ±0.02 0.1 –0.1 ±0.02 0.1 dB
●
–0.1 ±0.02 0.1 –0.1 ±0.02 0.1 dB
●
–0.1 ±0.02 0.1 –0.1 ±0.02 0.1 dB
●
–0.15 ±0.02 0.15 –0.15 ±0.02 0.15 dB
●
–0.15 ±0.02 0.15 –0.15 ±0.02 0.15 dB
●
–0.15 ±0.02 0.15 –0.15 ±0.02 0.15 dB
●
–0.15 ±0.02 0.15 –0.15 ±0.02 0.15 dB
●
–0.15 ±0.02 0.15 –0.15 ±0.02 0.15 dB
●
–0.2 ±0.02 0.2 –0.2 ±0.02 0.2 dB
●
–0.6 ±0.02 0.6 –0.9 ±0.02 0.9 dB
6
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LTC6912
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
The ● denotes the specifications that apply over the full operating
= 25°C. VS = 5V, AGND = 2.5V, Gain = 1, RL = 10k to midsupply point, unless
A
otherwise noted.
C, I SUFFIXES H SUFFIX
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Specifications for the LTC6912-1 ONLY
Offset Voltage Magnitude Gain = 1
(Internal Op-Amp, Note 8)
Offset Voltage Magnitude Gain = 1
Referred to INA or INB Pins Gain = 10
(Note 8)
Input Offset Voltage Drift, 6 10 µV/°C
Internal Op Amp
DC Input Resistance at DC V
INA or INB Pins (Note 9) Gain = 0
DC Input Resistance Drift at Gain = 1 85 95 ppm/°C
INA or INB Pins (Note 9) Gain = 2 90 100 ppm/°C
DC Input Resistance Match Gain = 1
R
INA-RINB
DC Small Signal Output Resistance DC V
at OUT A or OUT B Pins Gain = 0 0.4 0.4 Ω
Gain Bandwidth Product Gain = 100
Wideband Noise f = 1kHz to 200kHz
(Referred to Input) Gain = 0 (Output Noise only) 8.9 8.9 µV
or V
or V
INB
INB
= 0V
= 0V
INA
State = 8, Software Shutdown
Gain = 1
Gain = 2
Gain = 5
Gain > 5
Gain = 5 100 110 ppm/°C
Gain = 10 120 130 ppm/°C
Gain = 20 130 140 ppm/°C
Gain = 50 150 160 ppm/°C
Gain = 100 190 200 ppm/°C
Gain = 2
Gain = 5
Gain > 5
INA
Gain = 1 0.7 0.7 Ω
Gain = 2 1.0 1.0 Ω
Gain = 5 1.9 1.9 Ω
Gain = 10 3.4 3.4 Ω
Gain = 20 6.4 6.4 Ω
Gain = 50 15 15 Ω
Gain = 100 30 30 Ω
State = 8, Software Shutdown
Gain = 1 15.6 15.6 µV
Gain = 2 11.1 11.1 µV
Gain = 5 8.3 8.3 µV
Gain = 10 7.4 7.4 µV
Gain = 20 7.0 7.0 µV
Gain = 50 6.7 6.7 µV
Gain = 100 6.3 6.3 µV
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
18 33 50 16 33 50 MHz
0.125 2 0.125 3.5 mV
0.25 3.5 0.25 6.5 mV
0.14 2 0.14 4 mV
>10 >10 MΩ
>10 >10 MΩ
10 10 kΩ
55kΩ
22kΩ
11kΩ
10 10 Ω
55Ω
55Ω
55Ω
>1 >1 MΩ
RMS
RMS
RMS
RMS
RMS
RMS
RMS
RMS
6912fa
7
LTC6912
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
The ● denotes the specifications that apply over the full operating
= 25°C. VS = 5V, AGND = 2.5V, Gain = 1, RL = 10k to midsupply point, unless
A
otherwise noted.
C, I GRADES H GRADE
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Specifications for the LTC6912-1 ONLY
Voltage Noise Density f = 50kHz
(Referred to Input) Gain = 1 35.6 35.6 nV/√Hz
Gain = 2 24.8 24.8 nV/√Hz
Gain = 5 19.1 19.1 nV/√Hz
Gain = 10 16.7 16.7 nV/√Hz
Gain = 20 16 16 nV/√Hz
Gain = 50 15.4 15.4 nV/√Hz
Gain = 100 15.1 15.1 nV/√Hz
Total Harmonic Distortion Gain = 10, fIN = 10kHz, V
Gain = 10, fIN = 100kHz, –82 – 82 dB
V
= 1V
OUT
RMS
Specifications for the LTC6912-2 ONLY
Voltage Gain (Note 6) VS = 2.7V, Gain = 1, RL = 10k
V
= 2.7V, Gain = 1, RL = 500Ω
S
= 2.7V, Gain = 2, RL = 10k
V
S
= 2.7V, Gain = 4, RL = 10k
V
S
V
= 2.7V, Gain = 8, RL = 10k
S
= 2.7V, Gain = 8, RL = 500Ω
V
S
V
= 2.7V, Gain = 16, RL =10k
S
= 2.7V, Gain = 32, RL = 10k
V
S
= 2.7V, Gain = 64, RL = 10k
V
S
V
= 2.7V, Gain = 64, RL = 500Ω
S
VS = 5V, Gain = 1, RL = 10k
V
= 5V, Gain = 1, RL = 500Ω
S
= 5V, Gain = 2, RL = 10k
V
S
= 5V, Gain = 4, RL = 10k
V
S
V
= 5V, Gain = 8, RL = 10k
S
= 5V, Gain = 8, RL = 500Ω
V
S
= 5V, Gain = 16, RL = 10k
V
S
V
= 5V, Gain = 32, RL = 10k
S
= 5V, Gain = 64, RL = 10k
V
S
= 5V, Gain = 64, RL = 500Ω
V
S
VS = ±5V, Gain = 1, RL = 10k
V
= ±5V, Gain = 1, RL = 500Ω
S
= ±5V, Gain = 2, RL = 10k
V
S
= ±5V, Gain = 4, RL = 10k
V
S
V
= ±5V, Gain = 8, RL = 10k
S
= ±5V, Gain = 8, RL = 500Ω
V
S
= ±5V, Gain = 16, RL = 10k
V
S
V
= ±5V, Gain = 32, RL = 10k
S
= ±5V, Gain = 64, RL = 10k
V
S
= ±5V, Gain = 64, RL = 500Ω
V
S
OUT
= 1V
RMS
–90 –90 dB
0.003 0.003 %
0.008 0.008 %
●
–0.07 0 0.07 –0.08 0 0.07 dB
●
–0.11 –0.02 0.07 – 0.13 – 0.02 0.07 dB
●
5.94 6.01 6.08 5.93 6.01 6.08 dB
●
11.9 12.02 12.12 11.88 12.02 12.12 dB
●
17.8 18.0 18.15 17.75 18.0 18.15 dB
●
17.65 17.94 18.15 17.50 17.94 18.15 dB
●
23.8 24.01 24.25 23.75 24.01 24.25 dB
●
29.7 30.0 30.2 29.65 30.0 30.2 dB
●
35.4 35.8 36.2 35.15 35.8 36.2 dB
●
34.15 35.3 36.0 33.40 35.3 36.0 dB
●
–0.08 0 0.08 –0.09 0 0.08 dB
●
–0.1 –0.01 0.08 – 0.12 –0.01 0.08 dB
●
5.95 6.02 6.09 5.94 6.02 6.09 dB
●
11.85 12.02 12.15 11.83 12.02 12.15 dB
●
17.85 18.01 18.15 17.83 18.01 18.15 dB
●
17.65 17.96 18.15 17.50 17.96 18.15 dB
●
23.85 24.02 24.15 23.80 24.02 24.15 dB
●
29.70 30.02 30.2 29.65 30.02 30.2 dB
●
35.5 35.9 36.25 35.40 35.9 36.25 dB
●
34.6 35.6 36.0 33.8 35.6 36.0 dB
●
–0.06 0.01 0.08 –0.07 0.01 0.08 dB
●
–0.1 0 0.08 –0.11 0 0.08 dB
●
5.95 6.02 6.09 5.94 6.02 6.09 dB
●
11.9 12.03 12.15 11.88 12.03 12.15 dB
●
17.85 18.02 18.15 17.83 18.02 18.15 dB
●
17.80 17.99 18.15 17.73 17.99 18.15 dB
●
23.85 24.03 24.15 23.82 24.03 24.15 dB
●
29.85 30.0 30.2 29.8 30.0 30.20 dB
●
35.65 36.0 36.20 35.55 36.0 36.20 dB
●
35.15 35.8 36.10 34.45 35.8 36.10 dB
8
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