LTC6912 - Dual Programmable Gain Amplifiers with Serial Digital Interface; Package: SSOP; Pins: 16; Temperature Range: 0°C to 70°C
LTC6912CGN-2#TR Parametric
Parameter Name
Attribute value
Brand Name
Linear Technology
Is it Rohs certified?
incompatible
Maker
Linear ( ADI )
Parts packaging code
SSOP
package instruction
SSOP,
Contacts
16
Manufacturer packaging code
GN
Reach Compliance Code
_compli
ECCN code
EAR99
Analog Integrated Circuits - Other Types
ANALOG CIRCUIT
JESD-30 code
R-PDSO-G16
JESD-609 code
e0
length
4.89 mm
Humidity sensitivity level
1
Maximum negative supply voltage (Vsup)
-5.25 V
Negative supply voltage minimum (Vsup)
-1.35 V
Nominal Negative Supply Voltage (Vsup)
-5 V
Number of functions
2
Number of terminals
16
Maximum operating temperature
70 °C
Minimum operating temperature
Package body material
PLASTIC/EPOXY
encapsulated code
SSOP
Package shape
RECTANGULAR
Package form
SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)
235
Certification status
Not Qualified
Maximum seat height
1.75 mm
Maximum supply voltage (Vsup)
5.25 V
Minimum supply voltage (Vsup)
1.35 V
Nominal supply voltage (Vsup)
5 V
surface mount
YES
Temperature level
COMMERCIAL
Terminal surface
Tin/Lead (Sn/Pb)
Terminal form
GULL WING
Terminal pitch
0.635 mm
Terminal location
DUAL
Maximum time at peak reflow temperature
20
width
3.9 mm
LTC6912CGN-2#TR Preview
LTC6912
Dual Programmable
Gain Amplifiers with
Serial Digital Interface
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.
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
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